FN Thomson Reuters Web of Science™ VR 1.0 PT S AU Acun, B Jain, N Bhatele, A Mubarak, M Carothers, CD Kale, LV AF Acun, Bilge Jain, Nikhil Bhatele, Abhinav Mubarak, Misbah Carothers, Christopher D. Kale, Laxmikant V. BE Hunold, S Costan, A Gimenez, D Iosup, A Ricci, L Requena, MEG Scarano, V Varbanescu, AL Scott, SL Lankes, S Weidendorfer, J Alexander, M TI Preliminary Evaluation of a Parallel Trace Replay Tool for HPC Network Simulations SO EURO-PAR 2015: PARALLEL PROCESSING WORKSHOPS SE Lecture Notes in Computer Science LA English DT Proceedings Paper CT 21st International Conference on Parallel and Distributed Computing (Euro-Par) CY AUG 24-28, 2015 CL Vienna, AUSTRIA SP Vienna Univ Technol, Fac Informat, Res Grp Parallel Comp ID PERFORMANCE PREDICTION AB This paper presents a preliminary evaluation of TraceR, a trace replay tool built upon the ROSS-based CODES simulation framework. TraceR can be used for predicting network performance and understanding network behavior by simulating messaging on interconnection networks. It addresses two major shortcomings in current network simulators. First, it enables fast and scalable simulations of large-scale supercomputer networks. Second, it can simulate production HPC applications using BigSim's emulation framework. In addition to introducing TraceR, this paper studies the impact of input parameters on simulation performance. We also compare TraceR with other network simulators such as SST and BigSim, and demonstrate TraceR's scalability using various case studies. C1 [Acun, Bilge; Jain, Nikhil; Kale, Laxmikant V.] Univ Illinois, Dept Comp Sci, Urbana, IL USA. [Bhatele, Abhinav] Lawrence Livermore Natl Lab, Ctr Appl Sci Comp, Livermore, CA USA. [Mubarak, Misbah] Argonne Natl Lab, Div Math & Comp Sci, Argonne, IL 60439 USA. [Carothers, Christopher D.] Rensselaer Polytech Inst, Dept Comp Sci, Troy, NY 12180 USA. RP Acun, B (reprint author), Univ Illinois, Dept Comp Sci, Urbana, IL USA. EM acun2@illinois.edu; nikhil@illinois.edu; bhatele@llnl.gov; mmubarak@anl.gov; chrisc@cs.rpi.edu; kale@illinois.edu NR 16 TC 1 Z9 1 U1 0 U2 0 PU SPRINGER INT PUBLISHING AG PI CHAM PA GEWERBESTRASSE 11, CHAM, CH-6330, SWITZERLAND SN 0302-9743 BN 978-3-319-27308-2; 978-3-319-27307-5 J9 LECT NOTES COMPUT SC PY 2015 VL 9523 BP 417 EP 429 DI 10.1007/978-3-319-27308-2_34 PG 13 WC Computer Science, Hardware & Architecture; Computer Science, Information Systems; Computer Science, Software Engineering; Computer Science, Theory & Methods SC Computer Science GA BE7GP UT WOS:000375226100034 ER PT S AU Collier, N Ozik, J Macal, CM AF Collier, Nicholson Ozik, Jonathan Macal, Charles M. BE Hunold, S Costan, A Gimenez, D Iosup, A Ricci, L Requena, MEG Scarano, V Varbanescu, AL Scott, SL Lankes, S Weidendorfer, J Alexander, M TI Large-Scale Agent-Based Modeling with Repast HPC: A Case Study in Parallelizing an Agent-Based Model SO EURO-PAR 2015: PARALLEL PROCESSING WORKSHOPS SE Lecture Notes in Computer Science LA English DT Proceedings Paper CT 21st International Conference on Parallel and Distributed Computing (Euro-Par) CY AUG 24-28, 2015 CL Vienna, AUSTRIA SP Vienna Univ Technol, Fac Informat, Res Grp Parallel Comp DE Agent-based modeling; ABMS; Repast HPC; Parallel simulation; Distributed simulation; High performance computing ID RESISTANT STAPHYLOCOCCUS-AUREUS; INFECTIONS AB We present a case study for parallelizing a large-scale epidemiologic ABM developed with Repast HPC, the Chicago Social Interaction Model (chiSIM). The original serial model is a CA-MRSA model which tracks CA-MRSA transmission dynamics and infection in Chicago, and represents the spread of CA-MRSA in the population of Chicago. We utilize both within compute node parallelization using the OpenMP toolkit and distributed parallelization across multiple processes using MPI. The combined approach yields a 1350 % increase in run time performance utilizing 128 compute nodes. C1 [Collier, Nicholson; Ozik, Jonathan; Macal, Charles M.] Argonne Natl Lab, Global Secur Sci, 9700 S Cass Ave, Argonne, IL 60439 USA. [Collier, Nicholson; Ozik, Jonathan] Univ Chicago, Computat Inst, Chicago, IL 60637 USA. RP Collier, N (reprint author), Argonne Natl Lab, Global Secur Sci, 9700 S Cass Ave, Argonne, IL 60439 USA. EM ncollier@anl.gov; jozik@anl.gov; macal@anl.gov NR 11 TC 1 Z9 1 U1 3 U2 3 PU SPRINGER INT PUBLISHING AG PI CHAM PA GEWERBESTRASSE 11, CHAM, CH-6330, SWITZERLAND SN 0302-9743 BN 978-3-319-27308-2; 978-3-319-27307-5 J9 LECT NOTES COMPUT SC PY 2015 VL 9523 BP 454 EP 465 DI 10.1007/978-3-319-27308-2_37 PG 12 WC Computer Science, Hardware & Architecture; Computer Science, Information Systems; Computer Science, Software Engineering; Computer Science, Theory & Methods SC Computer Science GA BE7GP UT WOS:000375226100037 ER PT S AU Dubey, A Fujita, H Rubenstein, Z Van Straalen, B Chien, AA AF Dubey, Anshu Fujita, Hajime Rubenstein, Zachary Van Straalen, Brian Chien, Andrew A. BE Hunold, S Costan, A Gimenez, D Iosup, A Ricci, L Requena, MEG Scarano, V Varbanescu, AL Scott, SL Lankes, S Weidendorfer, J Alexander, M TI A Case Study of Application Structure Aware Resilience Through Differentiated State Saving and Recovery SO EURO-PAR 2015: PARALLEL PROCESSING WORKSHOPS SE Lecture Notes in Computer Science LA English DT Proceedings Paper CT 21st International Conference on Parallel and Distributed Computing (Euro-Par) CY AUG 24-28, 2015 CL Vienna, AUSTRIA SP Vienna Univ Technol, Fac Informat, Res Grp Parallel Comp ID FAULT-TOLERANCE AB Resilience is a growing concern for large-scale simulations. As failures become more frequent, alternatives to global checkpointing that limit the extent of needed recovery become more desirable. Additionally, platforms will differ in both error rates and types, therefore, a flexible and customizable recovery strategy will be extremely helpful to the applications running on these platforms. Applications often have structures that provide logical confinement spaces that can be exploited for this purpose. We investigate a customizable recovery strategy using Chombo, a structured adaptive mesh refinement (SAMR) library, as a case study. We exploit the inherent granularities and hierarchy in SAMR to limit the impact of faults for localized recovery, and identify tunable parameters for customizing the strategy depending upon the application and platform behavior. We use Global View Resilience (GVR) library, which provides global versioning arrays for application-controlled state saving as our resiliency interface. C1 [Dubey, Anshu; Van Straalen, Brian] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Computat Res Div, Berkeley, CA 94720 USA. [Fujita, Hajime; Rubenstein, Zachary; Chien, Andrew A.] Univ Chicago, Dept Comp Sci, Chicago, IL 60637 USA. [Chien, Andrew A.] Argonne Natl Lab, Math & Comp Sci Div, Lemont, IL USA. RP Dubey, A (reprint author), Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Computat Res Div, Berkeley, CA 94720 USA. EM adubey@lbl.gov NR 16 TC 0 Z9 0 U1 1 U2 1 PU SPRINGER INT PUBLISHING AG PI CHAM PA GEWERBESTRASSE 11, CHAM, CH-6330, SWITZERLAND SN 0302-9743 BN 978-3-319-27308-2; 978-3-319-27307-5 J9 LECT NOTES COMPUT SC PY 2015 VL 9523 BP 619 EP 630 DI 10.1007/978-3-319-27308-2_50 PG 12 WC Computer Science, Hardware & Architecture; Computer Science, Information Systems; Computer Science, Software Engineering; Computer Science, Theory & Methods SC Computer Science GA BE7GP UT WOS:000375226100050 ER PT S AU Fang, A Fujita, H Chien, AA AF Fang, Aiman Fujita, Hajime Chien, Andrew A. BE Hunold, S Costan, A Gimenez, D Iosup, A Ricci, L Requena, MEG Scarano, V Varbanescu, AL Scott, SL Lankes, S Weidendorfer, J Alexander, M TI Towards Understanding Post-recovery Efficiency for Shrinking and Non-shrinking Recovery SO EURO-PAR 2015: PARALLEL PROCESSING WORKSHOPS SE Lecture Notes in Computer Science LA English DT Proceedings Paper CT 21st International Conference on Parallel and Distributed Computing (Euro-Par) CY AUG 24-28, 2015 CL Vienna, AUSTRIA SP Vienna Univ Technol, Fac Informat, Res Grp Parallel Comp DE Resilience; HPC; Post-recovery; Shrinking; Non-shrinking; Network topology AB We explore the post-recovery efficiency of shrinking and non-shrinking recovery schemes on high performance computing systems using a synthetic benchmark. We study the impact of network topology on post-recovery communication performance. Our experiments on the IBM BG/Q System Mira show that shrinking recovery can deliver up to 7.5% better efficiency for neighbor communication pattern, as the non-shrinking recovery can reduce communication performance. We expected a similar situation for our synthetic benchmark with collective communication, but the situation is quite different. Both shrinking and non-shrinking recovery reduce MPI performance (MPICH3.1) dramatically on collective communication; up to 14x worse, swamping any differences between the two approaches. This suggests that making MPI performance less sensitive to irregularity in performance and communicator size are critical for both recovery approaches. C1 [Fang, Aiman; Fujita, Hajime; Chien, Andrew A.] Univ Chicago, Chicago, IL 60637 USA. [Chien, Andrew A.] Argonne Natl Lab, Lemont, IL 60439 USA. RP Fang, A (reprint author), Univ Chicago, Chicago, IL 60637 USA. EM aimanf@cs.uchicago.edu; hfujita@cs.uchicago.edu; achien@cs.uchicago.edu NR 15 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER INT PUBLISHING AG PI CHAM PA GEWERBESTRASSE 11, CHAM, CH-6330, SWITZERLAND SN 0302-9743 BN 978-3-319-27308-2; 978-3-319-27307-5 J9 LECT NOTES COMPUT SC PY 2015 VL 9523 BP 656 EP 668 DI 10.1007/978-3-319-27308-2_53 PG 13 WC Computer Science, Hardware & Architecture; Computer Science, Information Systems; Computer Science, Software Engineering; Computer Science, Theory & Methods SC Computer Science GA BE7GP UT WOS:000375226100053 ER PT S AU Widener, PM Ferreira, KB Levy, S Fabian, N AF Widener, Patrick M. Ferreira, Kurt B. Levy, Scott Fabian, Nathan BE Hunold, S Costan, A Gimenez, D Iosup, A Ricci, L Requena, MEG Scarano, V Varbanescu, AL Scott, SL Lankes, S Weidendorfer, J Alexander, M TI Canaries in a Coal Mine: Using Application-Level Checkpoints to Detect Memory Failures SO EURO-PAR 2015: PARALLEL PROCESSING WORKSHOPS SE Lecture Notes in Computer Science LA English DT Proceedings Paper CT 21st International Conference on Parallel and Distributed Computing (Euro-Par) CY AUG 24-28, 2015 CL Vienna, AUSTRIA SP Vienna Univ Technol, Fac Informat, Res Grp Parallel Comp ID SYSTEMS; ALGORITHMS; RECOVERY AB Memory failures in future extreme scale applications are a significant concern in the high-performance computing community and have attracted much research attention. We contend in this paper that using application checkpoint data to detect memory failures has potential benefits and is preferable to examining application memory. To support this contention, we describe the application of machine learning techniques to evaluate the veracity of checkpoint data. Our preliminary results indicate that supervised decision tree machine learning approaches can effectively detect corruption in restart files, suggesting that future extreme-scale applications and systems may benefit from incorporating such approaches in order to cope with memory failures. C1 [Widener, Patrick M.; Ferreira, Kurt B.; Fabian, Nathan] Sandia Natl Labs, Ctr Res Comp, POB 5800, Albuquerque, NM 87185 USA. [Levy, Scott] Univ New Mexico, Albuquerque, NM 87131 USA. RP Widener, PM (reprint author), Sandia Natl Labs, Ctr Res Comp, POB 5800, Albuquerque, NM 87185 USA. EM patrick.widener@sandia.gov; kbferre@sandia.gov; slevy@cs.unm.edu; ndfabia@sandia.gov NR 26 TC 1 Z9 1 U1 1 U2 1 PU SPRINGER INT PUBLISHING AG PI CHAM PA GEWERBESTRASSE 11, CHAM, CH-6330, SWITZERLAND SN 0302-9743 BN 978-3-319-27308-2; 978-3-319-27307-5 J9 LECT NOTES COMPUT SC PY 2015 VL 9523 BP 669 EP 681 DI 10.1007/978-3-319-27308-2_54 PG 13 WC Computer Science, Hardware & Architecture; Computer Science, Information Systems; Computer Science, Software Engineering; Computer Science, Theory & Methods SC Computer Science GA BE7GP UT WOS:000375226100054 ER PT S AU Viswanathan, HS Hyman, JD Karra, S Carey, JW Porter, ML Rougier, E Currier, RP Kang, Q Zhou, L Jimenez-Martinez, J Makedonska, N Chen, L Middleton, RS AF Viswanathan, H. S. Hyman, J. D. Karra, S. Carey, J. W. Porter, M. L. Rougier, E. Currier, R. P. Kang, Q. Zhou, L. Jimenez-Martinez, J. Makedonska, N. Chen, L. Middleton, R. S. BE Drogos, DL TI Using Discovery Science To Increase Efficiency of Hydraulic Fracturing While Reducing Water Usage SO HYDRAULIC FRACTURING: ENVIRONMENTAL ISSUES SE ACS Symposium Series LA English DT Article; Book Chapter ID GAS-PRODUCTION; CHALLENGES; NETWORKS C1 [Viswanathan, H. S.; Hyman, J. D.; Karra, S.; Carey, J. W.; Porter, M. L.; Rougier, E.; Currier, R. P.; Kang, Q.; Zhou, L.; Jimenez-Martinez, J.; Makedonska, N.; Chen, L.; Middleton, R. S.] Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. RP Viswanathan, HS (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. EM viswana@lanl.gov OI Karra, Satish/0000-0001-7847-6293 NR 28 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 SIXTEENTH ST NW, WASHINGTON, DC 20036 USA SN 0097-6156 BN 978-0-8412-3122-1 J9 ACS SYM SER JI ACS Symp. Ser. PY 2015 VL 1216 BP 71 EP 88 D2 10.1021/bk-2015-1216 PG 18 WC Engineering, Petroleum; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA BE5KI UT WOS:000372944300003 ER PT J AU Cernohorsky, O Grym, J Yatskiv, R Pham, VH Hudry, D Dickerson, JH AF Cernohorsky, Ondrej Grym, Jan Yatskiv, Roman Pham Viet Hung Hudry, Damien Dickerson, James H. GP TANGER Ltd TI MONOLAYERS OF PLATINUM NANOPARTICLES PREPARED BY DIP-COATING SO NANOCON 2015: 7TH INTERNATIONAL CONFERENCE ON NANOMATERIALS - RESEARCH & APPLICATION LA English DT Proceedings Paper CT 7th International Conference on Nanomaterials - Research and Application CY OCT 14-16, 2015 CL Brno, CZECH REPUBLIC SP Tanger Ltd, Czech Soc New Mat & Technologies, Reg Ctr Adv Technologies & Mat, Mat Res Soc Serbia, Norsk Materialteknisk Selskap DE Pt nanoparticles; oleylamine; dip coating; self-assembly ID REVERSE MICELLES; HYDROGEN SENSORS; INP AB Platinum is a transition metal known for its catalytic properties, which are further enhanced when employed in a nanoparticle form. We have recently shown that a monolayer of Pt nanoparticles deposited on semiconductor substrates forms high quality Schottky diodes, which were used in sensitive hydrogen sensors with a detection limit of 1 ppm of H-2 in N-2. Preparation of ordered monolayers of Pt nanoparticles is essential for the understanding of the behaviour of such an interface. To obtain a hexagonal closed-packed nanoparticle array, we prepared Pt nanoparticles stabilized by oleylamine and oleic acid with a narrow size distribution and uniform shapes. A monolayer prepared by dip-coating of Si substrate in the suspension containing Pt nanoparticles showed hexagonal arrangement within separate domains with the surface coverage up to 90%. The increase of the surface coverage with increasing withdrawal speed of the dip-coating process was observed. C1 [Cernohorsky, Ondrej; Grym, Jan; Yatskiv, Roman] CAS, Inst Photon & Elect, Prague, Czech Republic. [Pham Viet Hung; Dickerson, James H.] Brookhaven Natl Lab, Ctr Funct Nanomat, Upton, NY 11973 USA. [Hudry, Damien; Dickerson, James H.] Brown Univ, Dept Phys, Providence, RI 02912 USA. RP Cernohorsky, O (reprint author), CAS, Inst Photon & Elect, Prague, Czech Republic. RI Yatskiv, Roman/F-3937-2014; Grym, Jan/C-4407-2013 OI Grym, Jan/0000-0003-0164-8581 NR 12 TC 0 Z9 0 U1 1 U2 1 PU TANGER LTD PI SLEZSKA PA KELTICKOVA 62, SLEZSKA, OSTRAVA 710 00, CZECH REPUBLIC BN 978-80-87294-63-5 PY 2015 BP 73 EP 78 PG 6 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary SC Science & Technology - Other Topics; Materials Science GA BE6SM UT WOS:000374708800011 ER PT S AU Potluri, S Rossetti, D Becker, D Poole, D Venkata, MG Hernandez, O Shamis, P Lopez, MG Baker, M Poole, W AF Potluri, Sreeram Rossetti, Davide Becker, Donald Poole, Duncan Venkata, Manjunath Gorentla Hernandez, Oscar Shamis, Pavel Lopez, M. Graham Baker, Mathew Poole, Wendy BE Venkata, MG Shamis, P Imam, N Lopez, MG TI Exploring OpenSHMEM Model to Program GPU-based Extreme-Scale Systems SO OPENSHMEM AND RELATED TECHNOLOGIES: EXPERIENCES, IMPLEMENTATIONS, AND TECHNOLOGIES, OPENSHMEM 2015 SE Lecture Notes in Computer Science LA English DT Proceedings Paper CT 2nd Workshop OpenSHMEM and Related Technologies CY AUG 04-06, 2015 CL Annapolis, MD SP Oak Ridge Natl Lab, DoD, Mellanox, NVIDIA, Intel, SGI AB Extreme-scale systems with compute accelerators such as Graphical Processing Unit (GPUs) have become popular for executing scientific applications. These systems are typically programmed using MPI and CUDA (for NVIDIA based GPUs). However, there are many drawbacks to the MPI+CUDA approach. The orchestration required between the compute and communication phases of the application execution, and the constraint that communication can only be initiated from serial portions on the Central Processing Unit (CPU) lead to scaling bottlenecks. To address these drawbacks, we explore the viability of using OpenSHMEM for programming these systems. In this paper, first, we make a case for supporting GPU-initiated communication, and suitability of the OpenSHMEM programming model. Second, we present NVSHMEM, a prototype implementation of the proposed programming approach, port Stencil and Transpose benchmarks which are representative of many scientific applications from MPI+CUDA model to OpenSHMEM, and evaluate the design and implementation of NVSHMEM. Finally, we provide a discussion on the opportunities and challenges of OpenSHMEMto program these systems, and propose extensions to OpenSHMEMto achieve the full potential of this programming approach. C1 [Potluri, Sreeram; Rossetti, Davide; Becker, Donald; Poole, Duncan] NVIDIA Corp, Santa Clara, CA USA. [Venkata, Manjunath Gorentla; Hernandez, Oscar; Shamis, Pavel; Lopez, M. Graham; Baker, Mathew] Oak Ridge Natl Lab, ESSC, Oak Ridge, TN USA. [Poole, Wendy] Open Source Software Solut, Knoxville, TN USA. RP Venkata, MG (reprint author), Oak Ridge Natl Lab, ESSC, Oak Ridge, TN USA. EM manjugv@ornl.gov OI Lopez, Graham/0000-0002-5375-2105 NR 18 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER INT PUBLISHING AG PI CHAM PA GEWERBESTRASSE 11, CHAM, CH-6330, SWITZERLAND SN 0302-9743 BN 978-3-319-26428-8; 978-3-319-26427-1 J9 LECT NOTES COMPUT SC PY 2015 VL 9397 BP 18 EP 35 DI 10.1007/978-3-319-26428-8_2 PG 18 WC Computer Science, Software Engineering; Computer Science, Theory & Methods SC Computer Science GA BE8PK UT WOS:000376685300002 ER PT S AU Hao, PF Pophale, S Shamis, P Curtis, T Chapman, B AF Hao, Pengfei Pophale, Swaroop Shamis, Pavel Curtis, Tony Chapman, Barbara BE Venkata, MG Shamis, P Imam, N Lopez, MG TI Check-Pointing Approach for Fault Tolerance in OpenSHMEM SO OPENSHMEM AND RELATED TECHNOLOGIES: EXPERIENCES, IMPLEMENTATIONS, AND TECHNOLOGIES, OPENSHMEM 2015 SE Lecture Notes in Computer Science LA English DT Proceedings Paper CT 2nd Workshop OpenSHMEM and Related Technologies CY AUG 04-06, 2015 CL Annapolis, MD SP Oak Ridge Natl Lab, DoD, Mellanox, NVIDIA, Intel, SGI AB Fault tolerance for long running applications is critical to guard against failure of either compute resources or a network. Accomplishing this task in software is non-trivial and there is an added level of complexity for implementing a working model for a one-sided communications library like OpenSHMEM, since there is no matching communication call at the target processing element (PE). In this paper we explore a fault tolerance scheme based on check-point and restart, that caters to the one-sided nature of PGAS programming model while leveraging features very specific to OpenSHMEM. Through a working implementation with the 1-D Jacobi code, we show that the approach is scalable and provides considerable computational resource saving. C1 [Hao, Pengfei; Curtis, Tony; Chapman, Barbara] Univ Houston, Houston, TX 77004 USA. [Pophale, Swaroop] Mellanox Technol, Sunnyvale, CA 94085 USA. [Shamis, Pavel] Oak Ridge Natl Lab, Oak Ridge, TN 37840 USA. RP Hao, PF (reprint author), Univ Houston, Houston, TX 77004 USA. EM phao@uh.edu; swaroop@mellanox.com; shamisp@ornl.gov; tonyc@cs.uh.edu; bchapman@uh.edu NR 14 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER INT PUBLISHING AG PI CHAM PA GEWERBESTRASSE 11, CHAM, CH-6330, SWITZERLAND SN 0302-9743 BN 978-3-319-26428-8; 978-3-319-26427-1 J9 LECT NOTES COMPUT SC PY 2015 VL 9397 BP 36 EP 52 DI 10.1007/978-3-319-26428-8_3 PG 17 WC Computer Science, Software Engineering; Computer Science, Theory & Methods SC Computer Science GA BE8PK UT WOS:000376685300003 ER PT S AU Lopez, MG Shamis, P Venkata, MG AF Lopez, M. Graham Shamis, Pavel Venkata, Manjunath Gorentla BE Venkata, MG Shamis, P Imam, N Lopez, MG TI An Evaluation of OpenSHMEM Interfaces for the Variable-Length Alltoallv() Collective Operation SO OPENSHMEM AND RELATED TECHNOLOGIES: EXPERIENCES, IMPLEMENTATIONS, AND TECHNOLOGIES, OPENSHMEM 2015 SE Lecture Notes in Computer Science LA English DT Proceedings Paper CT 2nd Workshop OpenSHMEM and Related Technologies CY AUG 04-06, 2015 CL Annapolis, MD SP Oak Ridge Natl Lab, DoD, Mellanox, NVIDIA, Intel, SGI ID SYSTEMS AB Alltoallv() is a collective operation which allows all processes to exchange variable amounts of data with all other processes in the communication group. This means that Alltoallv() requires not only O(N-2) communications, but typically also additional exchanges of the data lengths that will be transmitted in the eventual Alltoallv() call. This pre-exchange is used to calculate the proper offsets for the receiving buffers on the target processes. However, we propose two new candidate interfaces for Alltoallv() that would mitigate the need for the user to set up this extra exchange of information at the possible cost of memory efficiency. We explain the new interface variants and show how a single call can be used in place of the traditional Alltoall()/Alltoallv() pair. We then discuss the performance tradeoffs for overall communication and memory costs, as well as both software and hardware-based optimizations and their applicability to the various proposed interfaces. C1 [Lopez, M. Graham; Shamis, Pavel; Venkata, Manjunath Gorentla] Oak Ridge Natl Lab, Comp Sci & Math Div, Oak Ridge, TN 37921 USA. RP Lopez, MG (reprint author), Oak Ridge Natl Lab, Comp Sci & Math Div, Oak Ridge, TN 37921 USA. EM lopezmg@ornl.gov OI Lopez, Graham/0000-0002-5375-2105 NR 9 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER INT PUBLISHING AG PI CHAM PA GEWERBESTRASSE 11, CHAM, CH-6330, SWITZERLAND SN 0302-9743 BN 978-3-319-26428-8; 978-3-319-26427-1 J9 LECT NOTES COMPUT SC PY 2015 VL 9397 BP 87 EP 101 DI 10.1007/978-3-319-26428-8_6 PG 15 WC Computer Science, Software Engineering; Computer Science, Theory & Methods SC Computer Science GA BE8PK UT WOS:000376685300006 ER PT S AU Tang, CY Bouteiller, A Herault, T Venkata, MG Bosilca, G AF Tang, Chunyan Bouteiller, Aurelien Herault, Thomas Venkata, Manjunath Gorentla Bosilca, George BE Venkata, MG Shamis, P Imam, N Lopez, MG TI From MPI to OpenSHMEM: Porting LAMMPS SO OPENSHMEM AND RELATED TECHNOLOGIES: EXPERIENCES, IMPLEMENTATIONS, AND TECHNOLOGIES, OPENSHMEM 2015 SE Lecture Notes in Computer Science LA English DT Proceedings Paper CT 2nd Workshop OpenSHMEM and Related Technologies CY AUG 04-06, 2015 CL Annapolis, MD SP Oak Ridge Natl Lab, DoD, Mellanox, NVIDIA, Intel, SGI AB This work details the opportunities and challenges of porting a Petascale, MPI-based application -LAMMPS- to OpenSHMEM. We investigate the major programming challenges stemming from the differences in communication semantics, address space organization, and synchronization operations between the two programming models. This work provides several approaches to solve those challenges for representative communication patterns in LAMMPS, e.g., by considering group synchronization, peer's buffer status tracking, and unpacked direct transfer of scattered data. The performance of LAMMPS is evaluated on the Titan HPC system at ORNL. The OpenSHMEM implementations are compared with MPI versions in terms of both strong and weak scaling. The results outline that OpenSHMEM provides a rich semantic to implement scalable scientific applications. In addition, the experiments demonstrate that OpenSHMEM can compete with, and often improve on, the optimized MPI implementation. C1 [Tang, Chunyan; Bouteiller, Aurelien; Herault, Thomas; Bosilca, George] Univ Tennessee, Innovat Comp Lab, Knoxville, TN USA. [Venkata, Manjunath Gorentla] Oak Ridge Natl Lab, Oak Ridge, TN USA. RP Bouteiller, A (reprint author), Univ Tennessee, Innovat Comp Lab, Knoxville, TN USA. EM ctang7@vols.utk.edu; bouteill@icl.utk.edu; herault@icl.utk.edu; manjugv@ornl.gov; bosilca@icl.utk.edu NR 14 TC 0 Z9 0 U1 1 U2 1 PU SPRINGER INT PUBLISHING AG PI CHAM PA GEWERBESTRASSE 11, CHAM, CH-6330, SWITZERLAND SN 0302-9743 BN 978-3-319-26428-8; 978-3-319-26427-1 J9 LECT NOTES COMPUT SC PY 2015 VL 9397 BP 121 EP 137 DI 10.1007/978-3-319-26428-8_8 PG 17 WC Computer Science, Software Engineering; Computer Science, Theory & Methods SC Computer Science GA BE8PK UT WOS:000376685300008 ER PT S AU D'Azevedo, EF Imam, N AF D'Azevedo, Eduardo F. Imam, Neena BE Venkata, MG Shamis, P Imam, N Lopez, MG TI Graph 500 in OpenSHMEM SO OPENSHMEM AND RELATED TECHNOLOGIES: EXPERIENCES, IMPLEMENTATIONS, AND TECHNOLOGIES, OPENSHMEM 2015 SE Lecture Notes in Computer Science LA English DT Proceedings Paper CT 2nd Workshop OpenSHMEM and Related Technologies CY AUG 04-06, 2015 CL Annapolis, MD SP Oak Ridge Natl Lab, DoD, Mellanox, NVIDIA, Intel, SGI DE Graph 500; Graph benchmark; OpenSHMEM AB This document describes the effort to implement the Graph 500 benchmark using OpenSHMEM based on the MPI-2 one-side version. The Graph 500 benchmark performs a breadth-first search in parallel on a large randomly generated undirected graph and can be implemented using basic MPI-1 and MPI-2 one-sided communication. Graph 500 requires atomic bit-wise operations on unsigned long integers but neither atomic bit-wise operations nor OpenSHMEM for unsigned long are available in OpenSHEM. Such needed bit-wise atomic operations and support for unsigned long are implemented using atomic condition swap (CSWAP) on signed long integers. Preliminary results on comparing the OpenSHMEM and MPI-2 one-sided implementations on a Silicon Graphics Incorporated (SGI) cluster and the Cray XK7 are presented. C1 [D'Azevedo, Eduardo F.] Oak Ridge Natl Lab, Comp Sci & Math Div, Oak Ridge, TN 37831 USA. [Imam, Neena] Oak Ridge Natl Lab, Comp & Computat Sci Directorate, Oak Ridge, TN 37831 USA. RP D'Azevedo, EF (reprint author), Oak Ridge Natl Lab, Comp Sci & Math Div, Oak Ridge, TN 37831 USA. EM dazevedoef@ornl.gov; imamn@ornl.gov NR 13 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER INT PUBLISHING AG PI CHAM PA GEWERBESTRASSE 11, CHAM, CH-6330, SWITZERLAND SN 0302-9743 BN 978-3-319-26428-8; 978-3-319-26427-1 J9 LECT NOTES COMPUT SC PY 2015 VL 9397 BP 154 EP 163 DI 10.1007/978-3-319-26428-8_10 PG 10 WC Computer Science, Software Engineering; Computer Science, Theory & Methods SC Computer Science GA BE8PK UT WOS:000376685300010 ER PT S AU Lin, J Hamidouche, K Zhang, J Lu, XY Vishnu, A Panda, D AF Lin, Jian Hamidouche, Khaled Zhang, Jie Lu, Xiaoyi Vishnu, Abhinav Panda, Dhabaleswar BE Venkata, MG Shamis, P Imam, N Lopez, MG TI Accelerating k-NN Algorithm with Hybrid MPI and OpenSHMEM SO OPENSHMEM AND RELATED TECHNOLOGIES: EXPERIENCES, IMPLEMENTATIONS, AND TECHNOLOGIES, OPENSHMEM 2015 SE Lecture Notes in Computer Science LA English DT Proceedings Paper CT 2nd Workshop OpenSHMEM and Related Technologies CY AUG 04-06, 2015 CL Annapolis, MD SP Oak Ridge Natl Lab, DoD, Mellanox, NVIDIA, Intel, SGI DE MPI; OpenSHMEM; Hybrid programming model; Algorithm acceleration AB Machine learning algorithms are benefiting from the continuous improvement of programming models, including MPI, MapReduce and PGAS. k-Nearest Neighbors (k-NN) algorithm is a widely used machine learning algorithm, applied to supervised learning tasks such as classification. Several parallel implementations of k-NN have been proposed in the literature and practice. However, on high-performance computing systems with high-speed interconnects, it is important to further accelerate existing designs of the k-NN algorithm through taking advantage of scalable programming models. To improve the performance of k-NN on large-scale environment with InfiniBand network, this paper proposes several alternative hybrid MPI+OpenSHMEM designs and performs a systemic evaluation and analysis on typical workloads. The hybrid designs leverage the one-sided memory access to better overlap communication with computation than the existing pureMPI design, and propose better schemes for efficient buffer management. The implementation based on k-NN program from MaTEx toolkit with MVAPICH2-X (Unified MPI+ PGAS Communication Runtime over InfiniBand) shows up to 9.0% time reduction for training KDD Cup 2010 workload over 512 cores, and 27.6% time reduction for small workload with balanced communication and computation. Experiments of running with varied number of cores show that our design can maintain good scalability. C1 [Lin, Jian; Hamidouche, Khaled; Zhang, Jie; Lu, Xiaoyi; Panda, Dhabaleswar] Ohio State Univ, Dept Comp Sci & Engn, Columbus, OH 43210 USA. [Vishnu, Abhinav] Pacific NW Natl Lab, Richland, WA 99352 USA. RP Lin, J (reprint author), Ohio State Univ, Dept Comp Sci & Engn, Columbus, OH 43210 USA. EM linjia@cse.ohio-state.edu; hamidouc@cse.ohio-state.edu; zhanjie@cse.ohio-state.edu; luxi@cse.ohio-state.edu; abhinav.vishnu@pnnl.gov; panda@cse.ohio-state.edu NR 19 TC 0 Z9 0 U1 1 U2 1 PU SPRINGER INT PUBLISHING AG PI CHAM PA GEWERBESTRASSE 11, CHAM, CH-6330, SWITZERLAND SN 0302-9743 BN 978-3-319-26428-8; 978-3-319-26427-1 J9 LECT NOTES COMPUT SC PY 2015 VL 9397 BP 164 EP 177 DI 10.1007/978-3-319-26428-8_11 PG 14 WC Computer Science, Software Engineering; Computer Science, Theory & Methods SC Computer Science GA BE8PK UT WOS:000376685300011 ER PT S AU Baker, M Welch, A Venkata, MG AF Baker, Matthew Welch, Aaron Venkata, Manjunath Gorentla BE Venkata, MG Shamis, P Imam, N Lopez, MG TI Parallelizing the Smith-Waterman Algorithm Using OpenSHMEM and MPI-3 One-Sided Interfaces SO OPENSHMEM AND RELATED TECHNOLOGIES: EXPERIENCES, IMPLEMENTATIONS, AND TECHNOLOGIES, OPENSHMEM 2015 SE Lecture Notes in Computer Science LA English DT Proceedings Paper CT 2nd Workshop OpenSHMEM and Related Technologies CY AUG 04-06, 2015 CL Annapolis, MD SP Oak Ridge Natl Lab, DoD, Mellanox, NVIDIA, Intel, SGI DE OpenSHMEM; MPI-3; Smith-Waterman AB The Smith-Waterman algorithm is used for determining the similarity between two very long data streams. A popular application of the Smith-Waterman algorithm is for sequence alignment in DNA sequences. Like many computational algorithms, the Smith-Waterman algorithm is constrained by the memory resources and the computational capacity of the system. As such, it can be accelerated and run at larger scales by parallelizing the implementation, allowing the work to be distributed to exploit HPC systems. A central part of the algorithm is computing the similarity matrix which is the mechanism that evaluates the quality of the matching sequences. This access pattern to the matrix to compute the similarity is non-uniform; as such, it better suits the Partioned Global Address Space (PGAS) programming model. In this paper, we explore parallelizing the Smith-Waterman algorithm using the OpenSHMEM model and interfaces in OpenSHMEM 1.2 as well as the one-sided communication interfaces in MPI-3. Further, we also explore the advantages of using non-blocking communication interfaces, which are proposed as extensions for a future OpenSHMEM specification. We evaluate the parallel implementation on Titan, a Cray XK7 system at the Oak Ridge Leadership Computing Facility ( OLCF). Our results demonstrate good weak and strong scaling characteristics for both of the OpenSHMEM and MPI-3 implementations. C1 [Baker, Matthew; Welch, Aaron; Venkata, Manjunath Gorentla] Oak Ridge Natl Lab, Oak Ridge, TN USA. RP Baker, M (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN USA. EM bakermb@ornl.gov NR 11 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER INT PUBLISHING AG PI CHAM PA GEWERBESTRASSE 11, CHAM, CH-6330, SWITZERLAND SN 0302-9743 BN 978-3-319-26428-8; 978-3-319-26427-1 J9 LECT NOTES COMPUT SC PY 2015 VL 9397 BP 178 EP 191 DI 10.1007/978-3-319-26428-8_12 PG 14 WC Computer Science, Software Engineering; Computer Science, Theory & Methods SC Computer Science GA BE8PK UT WOS:000376685300012 ER PT J AU Palazzo, C Mariello, A Fiore, S D'Anca, A Elia, D Williams, DN Aloisio, G AF Palazzo, C. Mariello, A. Fiore, S. D'Anca, A. Elia, D. Williams, D. N. Aloisio, G. BE Smari, WW TI A Workflow-Enabled Big Data Analytics Software Stack for eScience SO PROCEEDINGS OF THE 2015 INTERNATIONAL CONFERENCE ON HIGH PERFORMANCE COMPUTING & SIMULATION (HPCS 2015) LA English DT Proceedings Paper CT International Conference on High Performance Computing and Simulation (HPCS) CY JUL 20-24, 2015 CL Amsterdam, NETHERLANDS SP European Grid Infrastructure, Eurotech, Grid Telekom, HUAWEI Technol Co Ltd, IBM, Intel Corp, Netherlands eScience Ctr, Nice Software, Nvidia, PRACE, SURFsara, Dutch HPC Ctr, Yahoo Corp DE big data analytics; scientific workflows; workflow modelling language; workflow engine ID SYSTEM AB The availability of systems able to process and analyse big amount of data has boosted scientific advances in several fields. Workflows provide an effective tool to define and manage large sets of processing tasks. In the big data analytics area, the Ophidia project provides a cross-domain big data analytics framework for the analysis of scientific, multi-dimensional datasets. The framework exploits a server-side, declarative, parallel approach for data analysis and mining. It also features a complete workflow management system to support the execution of complex scientific data analysis, schedule tasks submission, manage operators dependencies and monitor jobs execution. The workflow management engine allows users to perform a coordinated execution of multiple data analytics operators (both single and massive - parameter sweep) in an effective manner. For the definition of the big data analytics workflow, a JSON schema has been properly designed and implemented. To aid the definition of the workflows, a visual design language consisting of several symbols, named Data Analytics Workflow Modelling Language (DAWML), has been also defined. C1 [Palazzo, C.; Mariello, A.; Fiore, S.; D'Anca, A.; Elia, D.] Ctr Euromediterraneo Cambiamenti Climat, Lecce, Italy. [Williams, D. N.] Lawrence Livermore Natl Lab, Livermore, CA USA. [Aloisio, G.] Univ Salento, Lecce, Italy. RP Palazzo, C (reprint author), Ctr Euromediterraneo Cambiamenti Climat, Lecce, Italy. EM cosimo.palazzo@cmcc.it; andrea.mariello@cmcc.it; sandro.fiore@cmcc.it; alessandro.danca@cmcc.it; donatello.elia@cmcc.it; williams13@llnl.gov; giovanni.aloisio@unile.it RI Mariello, Andrea/Q-9660-2016; Aloisio, Giovanni/D-4196-2015 OI Mariello, Andrea/0000-0003-1597-9912; Aloisio, Giovanni/0000-0001-5902-6983 NR 16 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4673-7813-0 PY 2015 BP 545 EP 552 PG 8 WC Computer Science, Theory & Methods; Engineering, Electrical & Electronic SC Computer Science; Engineering GA BE7PL UT WOS:000375684100073 ER PT J AU Zhang, C AF Zhang, C. BE Xiao, X Loos, A Liu, D TI Evaluation of Test Methods for Triaxially Braided Composites using a Meso-scale Finite Element Model SO PROCEEDINGS OF THE AMERICAN SOCIETY FOR COMPOSITES: THIRTIETH TECHNICAL CONFERENCE LA English DT Proceedings Paper CT 30th Technical Conference of the American-Society-for-Composites CY SEP 28-30, 2015 CL East Lansing, MI SP Amer Soc Composites AB The characterization of triaxially braided composite is complicate due to the non-uniformity of deformation within the unit cell as well as the possibility of the free-edge effect related to the large size of the unit cell. Extensive experimental investigation has been conducted to develop more accurate test approaches in characterizing the actual mechanical properties of the material we are studying. In this work, a meso-scale finite element model is utilized to simulate two complex specimens: notched tensile specimen and tube tensile specimen, which are designed to avoid the free-edge effect and free-edge effect induced premature edge damage. The full field strain data is predicted numerically and compared with experimental data obtained by Digit Image Correlation. The numerically predicted tensile strength values are compared with experimentally measured results. The discrepancy between numerically predicted and experimentally measured data, the capability of different test approaches are analyzed and discussed. The presented numerical model could serve as assistance to the evaluation of different test methods, and is especially useful in identifying potential local damage events. C1 [Zhang, C.] Natl Renewable Energy Lab, Computat Sci Ctr, 15103 Denver Western Pkwy, Golden, CO 80401 USA. RP Zhang, C (reprint author), Natl Renewable Energy Lab, Computat Sci Ctr, 15103 Denver Western Pkwy, Golden, CO 80401 USA. NR 8 TC 0 Z9 0 U1 0 U2 0 PU DESTECH PUBLICATIONS, INC PI LANCASTER PA 439 DUKE STREET, LANCASTER, PA 17602-4967 USA BN 978-1-60595-225-3 PY 2015 BP 446 EP 456 PG 11 WC Engineering, Mechanical; Materials Science, Composites SC Engineering; Materials Science GA BE7MI UT WOS:000375565100034 ER PT J AU Koohbor, B Kidane, A Lu, WY AF Koohbor, B. Kidane, A. Lu, W. -Y. BE Xiao, X Loos, A Liu, D TI Dynamic Compressive Response of Polymeric Foams Subjected to Direct Impact Loading SO PROCEEDINGS OF THE AMERICAN SOCIETY FOR COMPOSITES: THIRTIETH TECHNICAL CONFERENCE LA English DT Proceedings Paper CT 30th Technical Conference of the American-Society-for-Composites CY SEP 28-30, 2015 CL East Lansing, MI SP Amer Soc Composites ID COMPOSITES; FAILURE AB Dynamic compressive response of rigid closed-cell polymeric foams under high strain rate direct impact loading conditions is investigated. The foam specimens are subjected to direct impact loading, while their deformation response is observed and quantified using high speed photography in conjunction with 3D digital image correlation. A modified single stage shock tube apparatus with an aluminum projectile are used to generate the direct impact loading. The load applied on the specimen is measured using the load-cells at the other end of the specimen. The major challenge in high strain experiments, i.e. achieving equilibrium at the early stages of the deformation, has been compensated by performing an inverse analysis and accounting for the effect of inertia stresses into the analysis. The full-field acceleration distribution has first been calculated over the entire regions of interest. Then the inertia stresses are determined considering a one-dimensional equation of motion, and superimposed to the stress magnitude measured from the load-cells. The effects of material compressibility and the local change of density have also been included in the analysis. For this purpose, a mathematical model based on the principle of conservation of mass is proposed which enables the calculation of the local material density as a function of initial density, local plastic strain and local plastic Poisson's ratio. Finally, the dynamic stress-strain responses of the foam specimens are presented as a function of foam density. The failure mechanisms as a function of foam density and loading rate are discussed. C1 [Koohbor, B.; Kidane, A.] Univ S Carolina, Dept Mech Engn, 300 Main St, Columbia, SC 29208 USA. [Lu, W. -Y.] Sandia Natl Labs, Livermore, CA 94551 USA. RP Koohbor, B (reprint author), Univ S Carolina, Dept Mech Engn, 300 Main St, Columbia, SC 29208 USA. NR 13 TC 0 Z9 0 U1 0 U2 0 PU DESTECH PUBLICATIONS, INC PI LANCASTER PA 439 DUKE STREET, LANCASTER, PA 17602-4967 USA BN 978-1-60595-225-3 PY 2015 BP 1685 EP 1695 PG 11 WC Engineering, Mechanical; Materials Science, Composites SC Engineering; Materials Science GA BE7MI UT WOS:000375565100128 ER PT J AU Dib, G Karpenko, O Koricho, E Haq, M Udpa, L Udpa, S AF Dib, G. Karpenko, O. Koricho, E. Haq, M. Udpa, L. Udpa, S. BE Xiao, X Loos, A Liu, D TI Guided Wave Structural Health Monitoring for Impact Damage Detection and Characterization SO PROCEEDINGS OF THE AMERICAN SOCIETY FOR COMPOSITES: THIRTIETH TECHNICAL CONFERENCE LA English DT Proceedings Paper CT 30th Technical Conference of the American-Society-for-Composites CY SEP 28-30, 2015 CL East Lansing, MI SP Amer Soc Composites AB Laminated composite structures are susceptible to impact damage mechanisms such as disbonds and delaminations that significantly weaken the structure. Due to the unpredictable and sudden nature of impacts, traditional scheduled maintenances might fail to detect such damage in a timely fashion. Guided wave structural health monitoring (GWSHM) uses a network of sensors that are permanently surface-mounted or embedded in the structure, allowing for continuous monitoring, and potentially make it possible to detect an impact damage the moment it happens. In order for a GWSHM system to be reliable, it is important to investigate the ability of guided waves to detect impact damage with high probability and with a low false alarm rate. In this work, a glass fiber composite coupon with plain-weave S-glass/SC-15 epoxy is instrumented with lead-zirconate-titanate (PZT) piezoelectric thin films that are used for the generation and detection of guided waves. Baseline data is then recorded for each transducer path in the bonded GWSHM transducer network. The composite coupon is then hit by drop weight impactor with varying energies. The correlation between impact energy, observed structural damage, and the change in the guided wave signals is investigated. Based on those observations, multiple signal features based on baseline comparison are then investigated, including time domain and frequency domain signal features. C1 [Dib, G.] Pacific NW Natl Lab, Richland, WA 99354 USA. [Karpenko, O.; Udpa, L.; Udpa, S.] Michigan State Univ, Nondestruct Evaluat Lab, E Lansing, MI 48824 USA. [Koricho, E.; Haq, M.] Michigan State Univ, Composite Vehicle Res Ctr, E Lansing, MI 48824 USA. RP Dib, G (reprint author), Pacific NW Natl Lab, Richland, WA 99354 USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU DESTECH PUBLICATIONS, INC PI LANCASTER PA 439 DUKE STREET, LANCASTER, PA 17602-4967 USA BN 978-1-60595-225-3 PY 2015 BP 2724 EP 2735 PG 12 WC Engineering, Mechanical; Materials Science, Composites SC Engineering; Materials Science GA BE7MI UT WOS:000375565100209 ER PT B AU Bateman, K Wahlquist, D Malewitz, T AF Bateman, Ken Wahlquist, Dennis Malewitz, Tim GP ASME TI PROCESS AND EQUIPMENT DEVELOPMENT FOR HOT ISOSTATIC PRESSING TREATABILITY STUDY SO PROCEEDINGS OF THE ASME INTERNATIONAL MECHANICAL ENGINEERING CONGRESS AND EXPOSITION, 2014, VOL 11 LA English DT Proceedings Paper CT ASME International Mechanical Engineering Congress and Exposition (IMECE2014) CY NOV 14-20, 2014 CL Montreal, CANADA SP ASME AB Battelle Energy Affiance (BEA), LLC, has developed processes and equipment for a pilot-scale hot isostatic pressing (HIP) treatability study to stabilize and volume reduce radioactive calcine stored at Idaho National Laboratory (INL). In 2009, the U. S. Department of Energy signed a Record of Decision with the state of Idaho selecting HIP technology as the method to treat 5,800 yd(3) (4,400 m(3)) of granular zirconia and alumina calcine produced between 1953 and 1992 as a waste byproduct of spent nuclear fuel reprocessing. Since the 1990s, a variety of radioactive and hazardous waste forms have been remotely treated using HIP within INL hot cells. To execute the remote process at INL, waste is loaded into a stainless-steel or aluminum can, which is evacuated, sealed, and placed into a HIP furnace. The HIP simultaneously heats and pressurizes the waste, reducing its volume and increasing its durability. Two 1-gal cans of calcine waste currently stored in a shielded cask were identified as candidate materials for a treatability study involving the HIP process. Equipment and materials for cask handling and calcine transfer into INL hot cells, as well as remotely operated equipment for waste can opening, particle sizing, material blending, and HIP can loading have been designed and successfully tested. These results demonstrate BEA's readiness for treatment of INL calcine. C1 [Bateman, Ken; Wahlquist, Dennis] Idaho Natl Lab, Idaho Falls, ID 83415 USA. [Malewitz, Tim] Portage Inc, Idaho Falls, ID USA. RP Bateman, K (reprint author), Idaho Natl Lab, Idaho Falls, ID 83415 USA. RI Malewitz, Tim/C-6579-2017 OI Malewitz, Tim/0000-0002-4838-6585 NR 8 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC MECHANICAL ENGINEERS PI NEW YORK PA THREE PARK AVENUE, NEW YORK, NY 10016-5990 USA BN 978-0-7918-4960-6 PY 2015 AR UNSP V011T14A042 PG 10 GA BE7MD UT WOS:000375505300042 ER PT B AU Wahlquist, D Bateman, K Malewitz, T AF Wahlquist, Dennis Bateman, Ken Malewitz, Tim GP ASME TI REMOTE SEALING OF CANISTERS FOR HOT ISOSTATIC PRESSING SO PROCEEDINGS OF THE ASME INTERNATIONAL MECHANICAL ENGINEERING CONGRESS AND EXPOSITION, 2014, VOL 11 LA English DT Proceedings Paper CT ASME International Mechanical Engineering Congress and Exposition (IMECE2014) CY NOV 14-20, 2014 CL Montreal, CANADA SP ASME AB Battelle Energy Alliance, LLC, has successfully tested a remote welding process to seal radioactive waste containers prior to hot isostatic pressing (HIP). Since the 1990s, a variety of radioactive and hazardous waste forms have been remotely treated using HIP during trials within Idaho National Laboratory (INL) hot cells. For HIP treatment at INL, waste was loaded into a stainless-steel or aluminum canister, which was evacuated, seal welded, and placed in a HIP furnace. HIP simultaneously heats and pressurizes the waste, reducing its volume and increasing its stability, thus lowering the cost and risk associated with disposal. Weld integrity must be ensured in order to prevent the spread of contamination during HIP. This paper presents a process for sealing HIP canisters remotely using modified, commercially available equipment. This process includes evacuation, heating, welding, and weld inspection. The process and equipment have proven to reliably seal canisters in continued HIP trials. C1 [Wahlquist, Dennis; Bateman, Ken] Idaho Natl Lab, Idaho Falls, ID 83415 USA. [Malewitz, Tim] Portage Inc, Idaho Falls, ID USA. RP Wahlquist, D (reprint author), Idaho Natl Lab, Idaho Falls, ID 83415 USA. RI Malewitz, Tim/C-6579-2017 OI Malewitz, Tim/0000-0002-4838-6585 NR 7 TC 0 Z9 0 U1 0 U2 1 PU AMER SOC MECHANICAL ENGINEERS PI NEW YORK PA THREE PARK AVENUE, NEW YORK, NY 10016-5990 USA BN 978-0-7918-4960-6 PY 2015 AR UNSP V011T14A041 PG 5 GA BE7MD UT WOS:000375505300041 ER PT B AU Lane, WA Ryan, EM Sarkar, A Sundaresan, S AF Lane, William A. Ryan, Emily M. Sarkar, Avik Sundaresan, Sankaran GP ASME TI SUB-GRID FILTERING MODEL FOR MULTIPHASE HEAT TRANSFER WITH IMMERSED TUBES SO PROCEEDINGS OF THE ASME INTERNATIONAL MECHANICAL ENGINEERING CONGRESS AND EXPOSITION, 2014, VOL 8A LA English DT Proceedings Paper CT ASME International Mechanical Engineering Congress and Exposition (IMECE2014) CY NOV 14-20, 2014 CL Montreal, CANADA SP ASME ID GAS-PARTICLE FLOWS; UNCERTAINTY AB Adequately resolving the hydrodynamics and heat transfer in gas-solid flow simulations typically requires computational grids on the order of 1-10 particle diameters. This requirement is not feasible for most full-scale applications. To overcome these impracticalities, we consider a sub-grid filtering approach where the microscopic heat transfer mechanisms are approximated through coarse grid simulations using constitutive relations. Using the open source CFD code Multiphase Flow with Interphase Exchanges (MFIX), we simulate a periodic unit cell domain with immersed horizontal heat transfer cylinders under varying solid-phase fractions and temperatures. The simulation results are averaged over the domain and are used to fit functional forms describing relations between the flow properties and input conditions. The result is a constitutive function that is added as a source term to the solid-phase energy conservation equation to approximate the effective heat transfer between the cylinders and flow with coarse grid simulations. C1 [Lane, William A.; Ryan, Emily M.] Boston Univ, Dept Mech Engn, Boston, MA 02215 USA. [Sarkar, Avik] Pacific NW Natl Lab, Richland, WA 99354 USA. [Sundaresan, Sankaran] Princeton Univ, Dept Chem Engn, Princeton, NJ 08540 USA. RP Ryan, EM (reprint author), Boston Univ, Dept Mech Engn, Boston, MA 02215 USA. EM ryanem@bu.edu NR 17 TC 0 Z9 0 U1 1 U2 1 PU AMER SOC MECHANICAL ENGINEERS PI NEW YORK PA THREE PARK AVENUE, NEW YORK, NY 10016-5990 USA BN 978-0-7918-4955-2 PY 2015 AR UNSP V08AT10A060 PG 7 WC Thermodynamics; Engineering, Mechanical SC Thermodynamics; Engineering GA BE7JJ UT WOS:000375369300060 ER PT B AU Morrison, MC Bateman, KJ AF Morrison, Matthew C. Bateman, Kenneth J. GP ASME TI TRANSFER AND STORAGE OF MOLTEN SALT FOR THE PYROPROCESSING OF USED NUCLEAR FUEL SO PROCEEDINGS OF THE ASME INTERNATIONAL MECHANICAL ENGINEERING CONGRESS AND EXPOSITION, 2014, VOL 8A LA English DT Proceedings Paper CT ASME International Mechanical Engineering Congress and Exposition (IMECE2014) CY NOV 14-20, 2014 CL Montreal, CANADA SP ASME AB The transfer and storage of molten salts are being examined to support electrorefining operations at the Idaho National Laboratory. Two important factors that will need to be considered when removing molten salt from either of the two electrorefiners are (1) how to remove salt in a safe and timely manner and (2) how to store significant amounts of electrorefiner salt. A Vacuum Induced Salt Transfer and Storage (VISTAS) system is being evaluated to address these two important factors. This process draws a vacuum in a container through the use of a venturi vacuum pump. The end of a heated drawtube is inserted into the molten salt bath and the molten salt is pulled into the container. A redundant level switch triggered both by the thermal conductivity of the salt and a preset temperature threshold then activates a solenoid, which turns off the argon supply to the venturi vacuum pump, stopping the flow of molten salt. A cooling coil is incorporated into the salt transfer equipment design as a failsafe if the level switch was to fail. A full-scale version of the conceptual design (43 kg capacity) was fabricated to test the vacuum draw salt withdrawal method in an inert argon atmosphere glovebox. In addition, a custom molten salt furnace was designed and fabricated within the glovebox to represent the actual size of an electrorefiner port. Initial testing of the VISTAS system was very successful. The salt was transferred at a consistent rate and the level switch reliably stopped flow. Because the system has a failsafe cooling mechanism, it is considered to have low risk of a salt spill. The container Was found to improve storage density, reduce the diffusion of moisture, and reduce material surface area when compared to current options. This system appears to be well suited for this application and further development is recommended. C1 [Morrison, Matthew C.; Bateman, Kenneth J.] Idaho Natl Lab, Fuel Cycle Programs Div, Idaho Falls, ID USA. RP Morrison, MC (reprint author), Idaho Natl Lab, Fuel Cycle Programs Div, Idaho Falls, ID USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC MECHANICAL ENGINEERS PI NEW YORK PA THREE PARK AVENUE, NEW YORK, NY 10016-5990 USA BN 978-0-7918-4955-2 PY 2015 AR UNSP V08AT10A088 PG 10 WC Thermodynamics; Engineering, Mechanical SC Thermodynamics; Engineering GA BE7JJ UT WOS:000375369300088 ER PT B AU O'Brien, JE Sabharwall, P Yoon, S AF O'Brien, James E. Sabharwall, Piyush Yoon, SuJong GP ASME TI DEVELOPMENT OF A MULTI-LOOP FLOW AND HEAT TRANSFER FACILITY FOR ADVANCED NUCLEAR REACTOR THERMAL HYDRAULIC AND HYBRID ENERGY SYSTEM STUDIES SO PROCEEDINGS OF THE ASME INTERNATIONAL MECHANICAL ENGINEERING CONGRESS AND EXPOSITION, 2014, VOL 8A LA English DT Proceedings Paper CT ASME International Mechanical Engineering Congress and Exposition (IMECE2014) CY NOV 14-20, 2014 CL Montreal, CANADA SP ASME ID HIGH-TEMPERATURE REACTOR AB A new high-temperature multi-fluid, multi-loop test facility for advanced nuclear applications is under development at the Idaho National Laboratory. The facility will include three flow loops: high-temperature helium, molten salt, and steam/water. Molten salts have been identified as excellent candidate heat transport fluids for primary or secondary coolant loops, supporting advanced high temperature and small modular reactors (SMRs). Details of some of the design aspects and challenges of this facility, which is currently in the conceptual design phase, are discussed. A preliminary design configuration will be presented, with the required characteristics of the various components. The loop will utilize advanced high-temperature compact printed-circuit heat exchangers (PCHEs) operating at prototypic intermediate heat exchanger (IHX) conditions. The initial configuration will include a high-temperature (750 degrees C), high-pressure (7 MPa) helium loop thermally integrated with a molten fluoride salt (KF-ZrF4) flow loop operating at low pressure (0.2 MPa) at a temperature of similar to 450 degrees C. Experiment design challenges include identification of suitable materials and components that will withstand the required loop operating conditions. Corrosion and high temperature creep behavior are major considerations. The facility will include a thermal energy storage capability designed to support scaled process heat delivery for a variety of hybrid energy systems and grid stabilization strategies. Experimental results obtained from this research will also provide important data for code verification and validation (V&V) related to these systems. C1 [O'Brien, James E.; Sabharwall, Piyush; Yoon, SuJong] Idaho Natl Lab, Idaho Falls, ID USA. RP O'Brien, JE (reprint author), Idaho Natl Lab, Idaho Falls, ID USA. NR 27 TC 0 Z9 0 U1 1 U2 1 PU AMER SOC MECHANICAL ENGINEERS PI NEW YORK PA THREE PARK AVENUE, NEW YORK, NY 10016-5990 USA BN 978-0-7918-4955-2 PY 2015 AR UNSP V08AT10A090 PG 10 WC Thermodynamics; Engineering, Mechanical SC Thermodynamics; Engineering GA BE7JJ UT WOS:000375369300090 ER PT B AU Tencer, J AF Tencer, John GP ASME TI THE IMPACT OF REFERENCE FRAME ORIENTATION ON DISCRETE ORDINATES SOLUTIONS IN THE PRESENCE OF RAY EFFECTS AND A RELATED MITIGATION TECHNIQUE SO PROCEEDINGS OF THE ASME INTERNATIONAL MECHANICAL ENGINEERING CONGRESS AND EXPOSITION, 2014, VOL 8A LA English DT Proceedings Paper CT ASME International Mechanical Engineering Congress and Exposition (IMECE2014) CY NOV 14-20, 2014 CL Montreal, CANADA SP ASME ID RADIATIVE HEAT-TRANSFER; FINITE-VOLUME METHOD; QUADRATURE SCHEMES; FALSE SCATTERING; EQUATIONS; MEDIA AB The discrete ordinates method is a popular and versatile technique for deterministically solving the radiative transport which governs the exchange of radiant energy within a fluid or gas mixture. It is the most common 'high fidelity' technique used to approximate the radiative contribution in combined mode heat transfer applications. A major drawback of the discrete ordinates method is that the solution of the discretized equations may involve nonphysical oscillations due to the nature of the discretization in the angular space. These ray effects occur in a wide range of problems including those with steep temperature gradients either at the boundary or within the medium, discontinuities in the boundary emissivity due to the use of multiple materials or coatings, internal edges or corners in non-convex geometries, and many others. Mitigation of these ray effects either by increasing the number of ordinate directions or by filtering or smoothing the solution can yield significantly more accurate results and enhanced numerical stability for combined mode codes. When ray effects are present, the solution is seen to be highly dependent upon the relative orientation of the geometry and the global reference frame. This is an undesirable property. A novel ray effect mitigation technique is proposed. By averaging the computed solution for various orientations, the number of ordinate directions may be artificially increased in a trivially parallelizable way. This increases the frequency and decreases the amplitude of the ray effect oscillations. As the number of considered orientations increases a rotationally invariant solution is approached which is quite accurate. How accurate this solution is and how rapidly it is approached is problem dependent. Uncertainty in the smooth solution achieved after considering a relatively small number of orientations relative to the rotationally invariant solution may be quantified. C1 [Tencer, John] Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Tencer, J (reprint author), Sandia Natl Labs, Albuquerque, NM 87185 USA. NR 31 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC MECHANICAL ENGINEERS PI NEW YORK PA THREE PARK AVENUE, NEW YORK, NY 10016-5990 USA BN 978-0-7918-4955-2 PY 2015 AR UNSP V08AT10A017 PG 7 WC Thermodynamics; Engineering, Mechanical SC Thermodynamics; Engineering GA BE7JJ UT WOS:000375369300017 ER PT B AU Ramesh, S Ekkad, SV Straub, DL Lawson, SA Alvin, MA AF Ramesh, S. Ekkad, S. V. Straub, D. L. Lawson, S. A. Alvin, M. A. GP ASME TI EXPERIMENTAL AND COMPUTATIONAL ANALYSIS OF FILM COOLING HOLE PERFORMANCE ON A HIGH TEMPERATURE TEST RIG SO PROCEEDINGS OF THE ASME INTERNATIONAL MECHANICAL ENGINEERING CONGRESS AND EXPOSITION, 2014, VOL 8B LA English DT Proceedings Paper CT ASME International Mechanical Engineering Congress and Exposition (IMECE2014) CY NOV 14-20, 2014 CL Montreal, CANADA SP ASME AB Demand for more power from a gas turbine causes rotor inlet temperature to increase and in order to restrict the metal temperature in hot gas path components within a safe working limit, a better cooling system must be employed. This paper focuses on evaluating the performance of a film cooling hole in engine like conditions. Lab-scale experiments conducted prior to this study have established that tripod holes provide higher effectiveness compared to cylindrical and shaped holes while consuming only half the coolant. In spite of showing potential, it still has to yield superior cooling at engine like conditions. The high temperature test rig facility at NETL can raise the mainstream gas temperature as high as 1175 degrees C. Coolant temperature is adjusted to study film cooling performance at density ratio 2.8. This study presents results of baseline coupon testing. Metal coupons are made of Haynes230 alloy and are fabricated with cylindrical holes. Surface temperature is recorded using an IR thermographic camera which was calibrated using thermocouples, for different blowing ratios (0.5-2.0). Alongside experiment, a numerical model- was also developed in an attempt to provide additional insight on the distribution of surface temperature and overall effectiveness downstream of cooling hole. It was observed that film cooling is effective at M=2.0 and 1.5 and this was associated with high inlet turbulence and swirling velocities disrupting the film cooling performance at lower blowing ratios. CFD predictions seemed to match better at M 1.0 but were found to deviate considerably at other blowing ratios. C1 [Ramesh, S.; Ekkad, S. V.; Straub, D. L.; Lawson, S. A.; Alvin, M. A.] Natl Energy Technol Lab, Pittsburgh, PA USA. [Ramesh, S.; Ekkad, S. V.] Virginia Tech, Dept Mech Engn, Blacksburg, VA USA. RP Ramesh, S (reprint author), Natl Energy Technol Lab, Pittsburgh, PA USA. NR 16 TC 0 Z9 0 U1 2 U2 2 PU AMER SOC MECHANICAL ENGINEERS PI NEW YORK PA THREE PARK AVENUE, NEW YORK, NY 10016-5990 USA BN 978-0-7918-4956-9 PY 2015 AR UNSP V08BT10A007 PG 9 WC Thermodynamics; Engineering, Mechanical SC Thermodynamics; Engineering GA BE7JK UT WOS:000375370500007 ER PT B AU Siahpush, A O'Brien, J Crepeau, J Sabharwall, P AF Siahpush, Ali O'Brien, James Crepeau, John Sabharwall, Piyush GP ASME TI SCALE ANALYSIS AND EXPERIMENTAL RESULTS OF A SOLID/LIQUID PHASE-CHANGE THERMAL ENERGY STORAGE SYSTEM SO PROCEEDINGS OF THE ASME INTERNATIONAL MECHANICAL ENGINEERING CONGRESS AND EXPOSITION, 2014, VOL 8B LA English DT Proceedings Paper CT ASME International Mechanical Engineering Congress and Exposition (IMECE2014) CY NOV 14-20, 2014 CL Montreal, CANADA SP ASME ID MOVING BOUNDARY-PROBLEMS; NUMERICAL-SOLUTION; SOLIDIFICATION; SCHEME; WALL AB A detailed experimental study has been carried out to evaluate the heat transfer performance of a solid/liquid phase change thermal energy storage system. The phase-change material (PCM) and metal foam are contained in a vertically oriented test cylinder that is cooled or heated at its outside boundary, resulting in radially inward melting, respectively. Detailed quantitative time-dependent volumetric temperature distributions and melt-front motion and shape data were obtained. As the PCM melts, the interface moves away from the surface of the heat source/sink, and a thermal resistance layer is built up, resulting in a reduced heat transfer rate and/or increased temperature difference between the system to be cooled (or heated) and the PCM. The phase-change medium was 99% pure eicosane, with a melting temperature of 36.5 degrees C. Results have been generalized to apply to any low-Stefan number PCM. A heat transfer scale analysis was used in order to help in interpretation of the data and development of heat transfer correlations. In the scale analysis, conduction heat transfer in the solid and natural convection heat transfer in liquid were considered: Comparison of experimental data with scale-analysis predictions of the solid-liquid interface position and temperature distribution was performed. C1 [Siahpush, Ali] Ferris State Univ, Big Rapids, MI USA. [O'Brien, James; Sabharwall, Piyush] Idaho Natl Lab, Idaho Falls, ID 83415 USA. [Crepeau, John] Univ ID, Moscow, ID USA. RP Siahpush, A (reprint author), Ferris State Univ, Big Rapids, MI USA. NR 26 TC 0 Z9 0 U1 2 U2 2 PU AMER SOC MECHANICAL ENGINEERS PI NEW YORK PA THREE PARK AVENUE, NEW YORK, NY 10016-5990 USA BN 978-0-7918-4956-9 PY 2015 AR UNSP V08BT10A069 PG 8 WC Thermodynamics; Engineering, Mechanical SC Thermodynamics; Engineering GA BE7JK UT WOS:000375370500069 ER PT B AU Grudzinski, JJ Gosz, M AF Grudzinski, J. J. Gosz, M. GP ASME TI A NOVEL METHOD FOR THE IMPLEMENTATION OF CONTACT INCLUDING ENERGY DISSIPATION IN FINITE ELEMENT METHODS SO PROCEEDINGS OF THE ASME INTERNATIONAL MECHANICAL ENGINEERING CONGRESS AND EXPOSITION, 2014, VOL 9 LA English DT Proceedings Paper CT ASME International Mechanical Engineering Congress and Exposition (IMECE2014) CY NOV 14-20, 2014 CL Montreal, CANADA SP ASME ID DEFORMATION FRICTIONAL CONTACT; 3-DIMENSIONAL CONTACT; FORMULATION AB A new method for implementing contact/impact in an implicit finite element formulation has recently been developed. The method uses the idea of buoyancy and fluid drag forces to enforce the contact constraint as well as provide a method of dissipating energy due to the contact. Additionally, the method provides a simplified means for accounting for contact friction. The method has potential usefulness in a certain class of problems such as contact with bodies having soft and viscous foundations as well as problems with sliding. In this work, we introduce the method and illustrate it with an-example that shows the benefits and utility of the method. C1 [Grudzinski, J. J.] Argonne Natl Lab, Nucl Engn Div, 9700 S Cass Ave, Argonne, IL 60439 USA. [Gosz, M.] IIT, Mech & Mat Engn, Chicago, IL 60616 USA. RP Grudzinski, JJ (reprint author), Argonne Natl Lab, Nucl Engn Div, 9700 S Cass Ave, Argonne, IL 60439 USA. EM jjg@anl.gov; gosz@iit.edu NR 27 TC 0 Z9 0 U1 1 U2 1 PU AMER SOC MECHANICAL ENGINEERS PI NEW YORK PA THREE PARK AVENUE, NEW YORK, NY 10016-5990 USA BN 978-0-7918-4958-3 PY 2015 AR UNSP V009T12A008 PG 13 WC Engineering, Mechanical; Mechanics SC Engineering; Mechanics GA BE7MB UT WOS:000375503500008 ER PT B AU Mohanty, S Jagielo, B Bhan, CB Majumdar, S Natesan, K AF Mohanty, Subhasish Jagielo, Bryan Bhan, Chi Bum Majumdar, Saurindranath Natesan, Krishnamurti BE Gross, DJ Simpson, KC Joshi, S Hafner, RS TI Online Stress Corrosion Crack Monitoring in Nuclear Reactor Components Using Active Ultrasonic Sensor Networks and Nonlinear System Identification - Data Fusion Based Big Data Analytics Approach SO PROCEEDINGS OF THE ASME PRESSURE VESSELS AND PIPING CONFERENCE - 2015, VOL 5 LA English DT Proceedings Paper CT ASME Pressure Vessels and Piping Conference, PVP-2015 CY JUL 19-23, 2015 CL Boston, MA SP ASME, Pressure Vessels & Pip Div AB The current state of the art nondestructive evaluation (NDE) techniques used in nuclear reactor structural inspection are manual labor intensive, time consuming, and only used when the reactor has been shut down. Also, despite periodic inspection of plant components, a failure mode such as stress corrosion crack can initiate in between two scheduled inspections and can become critical before the next scheduled inspection. In this context, real time monitoring of nuclear reactor components is necessary for continuous and autonomous monitoring of component structural health. In this research, an active ultrasonic based on-line monitoring (OLM) framework is developed which can be used for real-time monitoring of degradation of nuclear power plant systems, structures, and components. Nonlinear system identification technique such as Bayesian Gaussian Process technique method is investigated to estimate the structural degradation in real-time. Active broadband ultrasound input is used for damage interrogation and a multi-sensor configuration is implemented to improve spatial resolution of state estimation. The damage index at any particular time is computed using nonlinear techniques such as Gaussian Process probabilistic modeling and the necessity of sensor data fusion is evaluated. The framework was demonstrated through the monitoring of an anomaly trend in a nuclear reactor steam generator tube undergoing stress corrosion cracking (SCC) testing. C1 [Mohanty, Subhasish; Bhan, Chi Bum; Majumdar, Saurindranath; Natesan, Krishnamurti] Argonne Natl Lab, Nucl Engn Div, Lemont, IL 75309 USA. [Jagielo, Bryan] Oakland Univ, Rochester, MI 48309 USA. RP Mohanty, S (reprint author), Argonne Natl Lab, Nucl Engn Div, Lemont, IL 75309 USA. EM smohanty@anl.gov NR 22 TC 0 Z9 0 U1 1 U2 1 PU AMER SOC MECHANICAL ENGINEERS PI NEW YORK PA THREE PARK AVENUE, NEW YORK, NY 10016-5990 USA BN 978-0-7918-5698-7 PY 2015 AR UNSP V005T10A005 PG 10 WC Engineering, Mechanical SC Engineering GA BE7SR UT WOS:000375807800039 ER PT B AU Pint, BA Dryepondt, S Brady, MP Yamamoto, Y Ruan, B McKeirnan, RD AF Pint, Bruce A. Dryepondt, Sebastien Brady, Michael P. Yamamoto, Yukinori Ruan, Bo McKeirnan, Robert D., Jr. GP ASME TI Field and Laboratory Evaluations of Commercial and Next Generation Alumina Forming Austenitic Foil for Advanced Recuperators SO PROCEEDINGS OF THE ASME TURBO EXPO: TURBINE TECHNICAL CONFERENCE AND EXPOSITION, 2015, VOL 8 LA English DT Proceedings Paper CT ASME Turbo Expo: Turbine Technical Conference and Exposition CY JUN 15-19, 2015 CL Montreal, CANADA SP Int Gas Turbine Inst ID STAINLESS-STEELS; WATER-VAPOR; TECHNOLOGIES; RESISTANCE; OXIDATION AB Alumina-forming austenitic (AFA) steels represent a new class of corrosion- and creep-resistant austenitic steels designed to enable higher temperature recuperators. Field trials are in progress for commercially rolled foil with widths over 39 cm. The first trial completed 3,000 h in a microturbine recuperator with an elevated turbine inlet temperature and showed limited degradation. A longer microturbine trial is in progress. A third exposure in a larger turbine has passed 16,000 h. To reduce alloy cost and address foil fabrication issues with the initial AFA composition, several new AFA compositions are being evaluated in creep and laboratory oxidation testing at 650 800 degrees C and the results compared to commercially fabricated AFA foil and conventional recuperator foil performance. C1 [Pint, Bruce A.; Dryepondt, Sebastien; Brady, Michael P.; Yamamoto, Yukinori] Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA. [Ruan, Bo; McKeirnan, Robert D., Jr.] Capstone Turbine Corp, Chatsworth, CA USA. RP Pint, BA (reprint author), Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA. EM pintba@ornl.gov; rmck@capstoneturbine.com RI Brady, Michael/A-8122-2008 OI Brady, Michael/0000-0003-1338-4747 NR 31 TC 0 Z9 0 U1 1 U2 1 PU AMER SOC MECHANICAL ENGINEERS PI NEW YORK PA THREE PARK AVENUE, NEW YORK, NY 10016-5990 USA BN 978-0-7918-5679-6 PY 2015 AR UNSP V008T23A010 PG 7 WC Engineering, Mechanical SC Engineering GA BE7JI UT WOS:000375367700010 ER PT S AU Wang, GJ Amman, M Mei, H Mei, DM Irmscher, K Guan, YT Yang, G AF Wang, Guojian Amman, Mark Mei, Hao Mei, Dongming Irmscher, Klaus Guan, Yutong Yang, Gang BE Tatina, R TI CRYSTAL GROWTH AND DETECTOR PERFORMANCE OF empty set12 CM HIGH-PURITY GE CRYSTALS SO PROCEEDINGS OF THE SOUTH DAKOTA ACADEMY OF SCIENCE, VOL 94 SE Proceedings of the South Dakota Academy of Science LA English DT Proceedings Paper CT 100th Annual Meeting of the South Dakota Academy of Science CY APR 10-11, 2015 CL Oacoma, SD SP S Dakota Acad Sci C1 [Wang, Guojian; Mei, Hao; Mei, Dongming; Guan, Yutong; Yang, Gang] Univ S Dakota, Dept Phys, Vermillion, SD 57069 USA. [Amman, Mark] Univ Calif Berkeley, Ernest Orlando Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. [Irmscher, Klaus] Leibniz Inst Crystal Growth, Berlin, Germany. RP Wang, GJ (reprint author), Univ S Dakota, Dept Phys, Vermillion, SD 57069 USA. EM Guojian.Wang@usd.edu NR 0 TC 0 Z9 0 U1 0 U2 0 PU SOUTH DAKOTA ACAD SCIENCE PI PIERRE PA HCR 531 BOX 97, PIERRE, SD 57501 USA SN 0096-378X J9 PROC S D ACAD SCI JI Proc. South Dak. Acad. Sci. PY 2015 VL 94 BP 351 EP 351 PG 1 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA BE8FO UT WOS:000376419700041 ER PT S AU Dark, M Bishop, M Linger, R Goldrich, L AF Dark, Melissa Bishop, Matt Linger, Richard Goldrich, Luanne BE Bishop, M Miloslavskaya, N Theocharidou, M TI Realism in Teaching Cybersecurity Research: The Agile Research Process SO INFORMATION SECURITY EDUCATION ACROSS THE CURRICULUM, WISE 9 SE IFIP Advances in Information and Communication Technology LA English DT Proceedings Paper CT 9th IFIP WG 11.8 World Conference on Information Security Education (WISE) CY MAY 26-28, 2015 CL Hamburg, GERMANY SP IFIP Working Grp 11 8 AB As global threats to information systems continue to increase, the value of effective cybersecurity research has never been greater. There is a pressing need to educate future researchers about the research process itself, which is increasingly unpredictable, multi-disciplinary, multi-organizational, and team-oriented. In addition, there is a growing demand for cybersecurity research that can produce fast, authoritative, and actionable results. In short, speed matters. Organizations conducting cyber defense can benefit from the knowledge and experience of the best minds in order to make effective decisions in difficult and fast moving situations. The Agile Research process is a new approach to provide such rapid, authoritative, applied research. It is designed to be fast, transparent, and iterative, with each iteration producing results that can be applied quickly. Purdue University is employing Agile Research as a teaching vehicle in an innovative, multi-university graduate program with government sponsor participation, as described in this paper. Because it simulates real-world operations and processes, this program is equipping students to become effective contributors to cybersecurity research. C1 [Dark, Melissa] Purdue Univ, Comp & Informat Technol Dept, W Lafayette, IN 47907 USA. [Bishop, Matt] Univ Calif Davis, Dept Comp Sci, Davis, CA 95616 USA. [Linger, Richard] Oak Ridge Natl Lab, Cyber & Informat Secur Res Grp, Oak Ridge, TN 37831 USA. [Goldrich, Luanne] Johns Hopkins Univ, Appl Phys Lab, Laurel, MD 20723 USA. RP Bishop, M (reprint author), Univ Calif Davis, Dept Comp Sci, Davis, CA 95616 USA. EM dark@purdue.edu; mabishop@ucdavis.edu; lingerr@ornl.gov; Luanne.Goldrich@jhuapl.edu NR 5 TC 1 Z9 1 U1 0 U2 1 PU SPRINGER-VERLAG BERLIN PI BERLIN PA HEIDELBERGER PLATZ 3, D-14197 BERLIN, GERMANY SN 1868-4238 BN 978-3-319-18500-2; 978-3-319-18499-9 J9 IFIP ADV INF COMM TE PY 2015 VL 453 BP 3 EP 14 DI 10.1007/978-3-319-18500-2_1 PG 12 WC Computer Science, Information Systems; Computer Science, Theory & Methods SC Computer Science GA BE6PW UT WOS:000374569100001 ER PT S AU O'Neill, H Shah, R Evans, BR He, JH Pingali, SV Chundawat, SPS Jones, AD Langan, P Davison, BH Urban, V AF O'Neill, Hugh Shah, Riddhi Evans, Barbara R. He, Junhong Pingali, Sai Venkatesh Chundawat, Shishir P. S. Jones, A. Daniel Langan, Paul Davison, Brian H. Urban, Volker BE Kelman, Z TI Production of Bacterial Cellulose with Controlled Deuterium-Hydrogen Substitution for Neutron Scattering Studies SO ISOTOPE LABELING OF BIOMOLECULES - LABELING METHODS SE Methods in Enzymology LA English DT Review; Book Chapter ID ACETOBACTER-XYLINUM; MICROBIAL CELLULOSE; HEAVY-WATER; BIOSYNTHESIS; DEUTERATION; GLUCOSE; BIOMASS; CELLS; OXIDE; CHLORELLA AB Isotopic enrichment of biomacromolecules is a widely used technique that enables the investigation of the structural and dynamic properties to provide information not accessible with natural abundance isotopic composition. This study reports an approach for deuterium incorporation into bacterial cellulose. A media formulation for growth of Acetobacter xylinus subsp. sucrofermentans and Gluconacetobacter hansenii was formulated that supports cellulose production in deuterium (D) oxide. The level of D incorporation can be varied by altering the ratio of deuterated and protiated glycerol used during cell growth in the D2O-based growth medium. Spectroscopic analysis and mass spectrometry show that the level of deuterium incorporation is high (>90%) for the perdeuterated form of bacterial cellulose. The small-angle neutron scattering profiles of the cellulose with different amounts of D incorporation are all similar indicating that there are no structural changes in the cellulose due to substitution of deuterium for hydrogen. In addition, by varying the amount of deuterated glycerol in the media it was possible to vary the scattering length density of the deuterated cellulose. The ability to control deuterium content of cellulose extends the range of experiments using techniques such as neutron scattering to reveal information about the structure and dynamics of cellulose, and its interactions with other biomacromolecules as well as synthetic polymers used for development of composite materials. C1 [O'Neill, Hugh; Shah, Riddhi; He, Junhong; Pingali, Sai Venkatesh; Langan, Paul; Urban, Volker] Oak Ridge Natl Lab, Biol & Soft Matter Div, Oak Ridge, TN USA. [Shah, Riddhi] Univ Tennessee, Bredesen Ctr Interdisciplinary Res & Grad Educ, Knoxville, TN USA. [Evans, Barbara R.] Oak Ridge Natl Lab, Div Chem Sci, Oak Ridge, TN USA. [Chundawat, Shishir P. S.] Rutgers State Univ, Dept Chem & Biochem Engn, Piscataway, NJ USA. [Jones, A. Daniel] Michigan State Univ, Dept Biochem & Mol Biol, E Lansing, MI 48824 USA. [Jones, A. Daniel] Michigan State Univ, Dept Chem, E Lansing, MI 48824 USA. [Davison, Brian H.] Oak Ridge Natl Lab, Biosci Div, Oak Ridge, TN USA. RP O'Neill, H (reprint author), Oak Ridge Natl Lab, Biol & Soft Matter Div, Oak Ridge, TN USA. EM oneillhm@ornl.gov RI Davison, Brian/D-7617-2013; OI Davison, Brian/0000-0002-7408-3609; Pingali, Sai Venkatesh/0000-0001-7961-4176; Chundawat, Shishir/0000-0003-3677-6735; Jones, A. Daniel/0000-0002-7408-6690; O'Neill, Hugh/0000-0003-2966-5527 NR 67 TC 1 Z9 1 U1 4 U2 16 PU ELSEVIER ACADEMIC PRESS INC PI SAN DIEGO PA 525 B STREET, SUITE 1900, SAN DIEGO, CA 92101-4495 USA SN 0076-6879 BN 978-0-12-803080-6; 978-0-12-803048-6 J9 METHOD ENZYMOL JI Methods Enzymol. PY 2015 VL 565 BP 123 EP 146 DI 10.1016/bs.mie.2015.08.031 PG 24 WC Biochemical Research Methods; Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA BE8AO UT WOS:000376152000007 PM 26577730 ER PT S AU Evans, BR Shah, R AF Evans, Barbara R. Shah, Riddhi BE Kelman, Z TI Development of Approaches for Deuterium Incorporation in Plants SO ISOTOPE LABELING OF BIOMOLECULES - LABELING METHODS SE Methods in Enzymology LA English DT Review; Book Chapter ID LEMNA-MINOR; HEAVY WATER; ARABIDOPSIS-THALIANA; BACTERIAL CELLULOSE; PROTEIN-DEGRADATION; WINTER RYE; VITAMIN-A; GROWTH; OXIDE; CULTIVATION AB Soon after the discovery of deuterium, efforts to utilize this stable isotope of hydrogen for labeling of plants began and have proven successful for natural abundance to 20% enrichment. However, isotopic labeling with deuterium (2H) in higher plants at the level of 40% and higher is complicated by both physiological responses, particularly water exchange through transpiration, and inhibitory effects of D2O on germination, rooting, and growth. The highest incorporation of 40-50% had been reported for photoheterotrophic cultivation of the duckweed Lemna. Higher substitution is desirable for certain applications using neutron scattering and nuclear magnetic resonance (NMR) techniques. (HH)-H-1-H-2 NMR and mass spectroscopy are standard methods frequently used for determination of location and amount of deuterium substitution. The changes in infrared (IR) absorption observed for H to D substitution in hydroxyl and alkyl groups provide rapid initial evaluation of incorporation. Short-term experiments with cold-tolerant annual grasses can be carried out in enclosed growth containers to evaluate incorporation. Growth in individual chambers under continuous air perfusion with dried sterile-filtered air enables long-term cultivation of multiple plants at different D2O concentrations. Vegetative propagation from cuttings extends capabilities to species with low germination rates. Cultivation in 50% D2O of annual ryegrass and switchgrass following establishment of roots by growth in H2O produces samples with normal morphology and 30-40% deuterium incorporation in the biomass. Winter grain rye (Secale cereale) was found to efficiently incorporate deuterium by photosynthetic fixation from 50% D2O but did not incorporate deuterated phenylalanine-d8 from the growth medium. C1 [Evans, Barbara R.] Oak Ridge Natl Lab, Div Chem Sci, Oak Ridge, TN USA. [Shah, Riddhi] Univ Tennessee, Bredesen Ctr Interdisciplinary Res & Grad Educ, Knoxville, TN USA. [Shah, Riddhi] Oak Ridge Natl Lab, Biol & Soft Matter Div, Oak Ridge, TN USA. RP Evans, BR (reprint author), Oak Ridge Natl Lab, Div Chem Sci, Oak Ridge, TN USA. EM evansb@ornl.gov NR 73 TC 1 Z9 1 U1 2 U2 4 PU ELSEVIER ACADEMIC PRESS INC PI SAN DIEGO PA 525 B STREET, SUITE 1900, SAN DIEGO, CA 92101-4495 USA SN 0076-6879 BN 978-0-12-803080-6; 978-0-12-803048-6 J9 METHOD ENZYMOL JI Methods Enzymol. PY 2015 VL 565 BP 213 EP 243 DI 10.1016/bs.mie.2015.07.014 PG 31 WC Biochemical Research Methods; Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA BE8AO UT WOS:000376152000011 PM 26577734 ER PT S AU Lin, PH Liao, CH Quinlan, DJ Guzik, S AF Lin, Pei-Hung Liao, Chunhua Quinlan, Daniel J. Guzik, Stephen BE Terboven, C DeSupinski, BR Reble, P Chapman, BM Muller, MS TI Experiences of Using the OpenMP Accelerator Model to Port DOE Stencil Applications SO OPENMP: HETEROGENOUS EXECUTION AND DATA MOVEMENTS, IWOMP 2015 SE Lecture Notes in Computer Science LA English DT Proceedings Paper CT 11th International Workshop on OpenMP (IWOMP) CY OCT 01-02, 2015 CL Aachen, GERMANY AB The Department of Energy has a wide range of large-scale, parallel scientific applications running on cutting-edge high-performance computing systems to support its mission and tackle critical science challenges. A recent trend in these high-performance computing systems is to add commodity accelerators, such as Nvidia GPUs and Intel Xeon Phi coprocessors, into computer nodes so we can achieve increased performance without exceeding the limited power budget. However, it is well-known in the high-performance computing community that porting existing applications to accelerators is a difficult task given the numerous set of unique hardware features and the general complexity of software. In this paper, we share our experiences of using the OpenMP Accelerator Model to port two stencil applications to exploit Nvidia GPUs. Introduced as part of the OpenMP 4.0 specification, the OpenMP accelerator model provides a set of directives for users to specify semantics related to accelerators so that compilers and runtime systems can automatically handle repetitive and error-prone accelerator programming tasks, including code transformations, work scheduling, data management, reduction, and so on. Using a prototype compiler implementation based on the ROSE source-to-source compiler framework, we report the problems we encountered during the porting process, our solutions, and the obtained performance. Productivity is also evaluated. Our experience shows that the existing OpenMP Accelerator Model can effectively help programmers leverage accelerators. However, complex data types and non-canonical control structures can pose challenges for programmers to productively apply accelerator directives. C1 [Lin, Pei-Hung; Liao, Chunhua; Quinlan, Daniel J.] Lawrence Livermore Natl Lab, Ctr Appl Sci Comp, Livermore, CA USA. [Guzik, Stephen] Colorado State Univ, Dept Mech Engn, Ft Collins, CO 80523 USA. RP Lin, PH (reprint author), Lawrence Livermore Natl Lab, Ctr Appl Sci Comp, Livermore, CA USA. EM lin32@llnl.gov; liao6@llnl.gov; dquinlan@llnl.gov; stephen.guzik@colostate.edu NR 13 TC 1 Z9 1 U1 0 U2 0 PU SPRINGER INT PUBLISHING AG PI CHAM PA GEWERBESTRASSE 11, CHAM, CH-6330, SWITZERLAND SN 0302-9743 BN 978-3-319-24595-9; 978-3-319-24594-2 J9 LECT NOTES COMPUT SC PY 2015 VL 9342 BP 45 EP 59 DI 10.1007/978-3-319-24595-9_4 PG 15 WC Computer Science, Hardware & Architecture; Computer Science, Information Systems; Computer Science, Software Engineering; Computer Science, Theory & Methods SC Computer Science GA BE6SO UT WOS:000374709400004 ER PT S AU Protze, J Laguna, I Ahn, DH Del Signore, J Burton, A Schulz, M Muller, MS AF Protze, Joachim Laguna, Ignacio Ahn, Dong H. Del Signore, John Burton, Ariel Schulz, Martin Mueller, Matthias S. BE Terboven, C DeSupinski, BR Reble, P Chapman, BM Muller, MS TI Lessons Learned from Implementing OMPD: A Debugging Interface for OpenMP SO OPENMP: HETEROGENOUS EXECUTION AND DATA MOVEMENTS, IWOMP 2015 SE Lecture Notes in Computer Science LA English DT Proceedings Paper CT 11th International Workshop on OpenMP (IWOMP) CY OCT 01-02, 2015 CL Aachen, GERMANY AB With complex codes moving to systems of increasing on-node parallelism using OpenMP, debugging these codes is becoming increasingly challenging. While debuggers can significantly aid programmers, existing ones support OpenMP at a low system-thread level, reducing their effectiveness. The previously published draft for a standard OpenMP debugging interface (OMPD) is supposed to enable the debuggers to raise their debugging abstraction to the conceptual levels of OpenMP by mediating the tools and OpenMP runtime library. In this paper, we present our experiences and the issues that we have found on implementing an OMPD library prototyp for a commonly used OpenMP runtime and a parallel debugger. C1 [Protze, Joachim; Mueller, Matthias S.] Rhein Westfal TH Aachen, D-52056 Aachen, Germany. [Protze, Joachim; Mueller, Matthias S.] JARA High Performance Comp, D-52062 Aachen, Germany. [Protze, Joachim; Laguna, Ignacio; Ahn, Dong H.; Schulz, Martin] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. [Del Signore, John; Burton, Ariel] Rogue Wave Software, Boulder, CO 80301 USA. RP Laguna, I (reprint author), Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. EM protze@itc.rwth-aachen.de; lagunaperalt1@llnl.gov; ahn1@llnl.gov; john.delsignore@roguewave.com; ariel.burton@roguewave.com; schulzm@llnl.gov; mueller@itc.rwth-aachen.de NR 5 TC 1 Z9 1 U1 0 U2 0 PU SPRINGER INT PUBLISHING AG PI CHAM PA GEWERBESTRASSE 11, CHAM, CH-6330, SWITZERLAND SN 0302-9743 BN 978-3-319-24595-9; 978-3-319-24594-2 J9 LECT NOTES COMPUT SC PY 2015 VL 9342 BP 89 EP 101 DI 10.1007/978-3-319-24595-9_7 PG 13 WC Computer Science, Hardware & Architecture; Computer Science, Information Systems; Computer Science, Software Engineering; Computer Science, Theory & Methods SC Computer Science GA BE6SO UT WOS:000374709400007 ER PT S AU Bihari, BL Bae, H Cownie, J Klemm, M Terboven, C Diachin, L AF Bihari, Barna L. Bae, Hansang Cownie, James Klemm, Michael Terboven, Christian Diachin, Lori BE Terboven, C DeSupinski, BR Reble, P Chapman, BM Muller, MS TI On the Algorithmic Aspects of Using OpenMP Synchronization Mechanisms II: User-Guided Speculative Locks SO OPENMP: HETEROGENOUS EXECUTION AND DATA MOVEMENTS, IWOMP 2015 SE Lecture Notes in Computer Science LA English DT Proceedings Paper CT 11th International Workshop on OpenMP (IWOMP) CY OCT 01-02, 2015 CL Aachen, GERMANY AB In this paper we continue our investigations started in [8] into the effects of using different synchronization mechanisms in OpenMP-threaded iterative mesh optimization algorithms. We port our test code to the Intel (R) Xeon (R) processor (former codename "Haswell") by employing a user-guided locking API for OpenMP [4] that provides a general and unified user interface and runtime framework. Since the Intel Transactional Synchronization Extensions (TSX) provide two different options for speculation - Hardware Lock Elision (HLE) and Restricted Transactional Memory (RTM) - we compare a total of four different run modes: (i) HLE, (ii) RTM, (iii) OpenMP critical, and (iv) "unsynchronized". As we did in [8], we find that either speculative execution option always outperforms the other two modes in terms of their convergence characteristics. Even with their higher overhead, the TSX options are very competitive when it comes to runtime performance measured with the "time-to-convergence" criterion introduced in [8]. C1 [Bihari, Barna L.; Diachin, Lori] Lawrence Livermore Natl Lab, Livermore, CA USA. [Bae, Hansang; Cownie, James; Klemm, Michael] Intel Corp, Santa Clara, CA USA. [Terboven, Christian] Rhein Westfal TH Aachen, Aachen, Germany. RP Terboven, C (reprint author), Rhein Westfal TH Aachen, Aachen, Germany. EM bihari1@llnl.gov; hansang.bae@intel.com; james.h.cownie@intel.com; michael.klemm@intel.com; terboven@itc.rwth-aachen.de; diachin2@llnl.gov NR 19 TC 1 Z9 1 U1 0 U2 0 PU SPRINGER INT PUBLISHING AG PI CHAM PA GEWERBESTRASSE 11, CHAM, CH-6330, SWITZERLAND SN 0302-9743 BN 978-3-319-24595-9; 978-3-319-24594-2 J9 LECT NOTES COMPUT SC PY 2015 VL 9342 BP 133 EP 148 DI 10.1007/978-3-319-24595-9_10 PG 16 WC Computer Science, Hardware & Architecture; Computer Science, Information Systems; Computer Science, Software Engineering; Computer Science, Theory & Methods SC Computer Science GA BE6SO UT WOS:000374709400010 ER PT S AU Scogland, TRW Gyllenhaal, J Keasler, J Hornung, R de Supinski, BR AF Scogland, Thomas R. W. Gyllenhaal, John Keasler, Jeff Hornung, Rich de Supinski, Bronis R. BE Terboven, C DeSupinski, BR Reble, P Chapman, BM Muller, MS TI Enabling Region Merging Optimizations in OpenMP SO OPENMP: HETEROGENOUS EXECUTION AND DATA MOVEMENTS, IWOMP 2015 SE Lecture Notes in Computer Science LA English DT Proceedings Paper CT 11th International Workshop on OpenMP (IWOMP) CY OCT 01-02, 2015 CL Aachen, GERMANY AB Maximizing the scope of a parallel region, which avoids the costs of barriers and of launching additional parallel regions, is among the first recommendations in any optimization guide for OpenMP. While clearly beneficial and easily accomplished for code where regions are visibly contiguous, regions often become contiguous only after compiler optimization or resolution of abstraction layers. This paper explores changes to the OpenMP specification that would allow implementations to merge adjacent parallel regions automatically, including the removal of issues that make the transformation non-conforming and the addition of hints that facilitate the optimization. Beyond simple merging, we explore hints to fuse workshared loops that occur in syntactically distinct parallel regions or to apply nowait to such loops. Our evaluation shows these changes can provide an overall speedup of 2-8x for a microbenchmark, or 6% for a representative physics application. C1 [Scogland, Thomas R. W.; Gyllenhaal, John; Keasler, Jeff; Hornung, Rich; de Supinski, Bronis R.] Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. RP Scogland, TRW (reprint author), Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. EM scogland1@llnl.gov NR 6 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER INT PUBLISHING AG PI CHAM PA GEWERBESTRASSE 11, CHAM, CH-6330, SWITZERLAND SN 0302-9743 BN 978-3-319-24595-9; 978-3-319-24594-2 J9 LECT NOTES COMPUT SC PY 2015 VL 9342 BP 177 EP 188 DI 10.1007/978-3-319-24595-9_13 PG 12 WC Computer Science, Hardware & Architecture; Computer Science, Information Systems; Computer Science, Software Engineering; Computer Science, Theory & Methods SC Computer Science GA BE6SO UT WOS:000374709400013 ER PT S AU Ciesko, J Mateo, S Teruel, X Martorell, X Ayguade, E Labarta, J Duran, A de Supinski, BR Olivier, S Li, K Eichenberger, AE AF Ciesko, Jan Mateo, Sergi Teruel, Xavier Martorell, Xavier Ayguade, Eduard Labarta, Jesus Duran, Alex de Supinski, Bronis R. Olivier, Stephen Li, Kelvin Eichenberger, Alexandre E. BE Terboven, C DeSupinski, BR Reble, P Chapman, BM Muller, MS TI Towards Task-Parallel Reductions in OpenMP SO OPENMP: HETEROGENOUS EXECUTION AND DATA MOVEMENTS, IWOMP 2015 SE Lecture Notes in Computer Science LA English DT Proceedings Paper CT 11th International Workshop on OpenMP (IWOMP) CY OCT 01-02, 2015 CL Aachen, GERMANY DE OpenMP; Task; Reduction; Recursion AB Reductions represent a common algorithmic pattern in many scientific applications. OpenMP* has always supported them on parallel and worksharing constructs. OpenMP 3.0's tasking constructs enable new parallelization opportunities through the annotation of irregular algorithms. Unfortunately the tasking model does not easily allow the expression of concurrent reductions, which limits the general applicability of the programming model to such algorithms. In this work, we present an extension to OpenMP that supports task-parallel reductions on task and taskgroup constructs to improve productivity and programmability. We present specification of the feature and explore issues for programmers and software vendors regarding programming transparency as well as the impact on the current standard with respect to nesting, untied task support and task data dependencies. Our performance evaluation demonstrates comparable results to hand coded task reductions. C1 [Ciesko, Jan; Mateo, Sergi; Teruel, Xavier; Martorell, Xavier; Ayguade, Eduard; Labarta, Jesus] Barcelona Supercomp Ctr, Barcelona, Spain. [Mateo, Sergi; Martorell, Xavier; Ayguade, Eduard; Labarta, Jesus] Univ Politecn Cataluna, Barcelona, Spain. [Duran, Alex] Intel Iberia Corp, Madrid, Spain. [de Supinski, Bronis R.] Lawrence Livermore Natl Lab, Livermore, CA USA. [Olivier, Stephen] Sandia Natl Labs, Livermore, CA USA. [Li, Kelvin; Eichenberger, Alexandre E.] IBM Corp, New York, NY USA. RP Mateo, S (reprint author), Barcelona Supercomp Ctr, Barcelona, Spain. EM jan.ciesko@bsc.es; sergi.mateo@bsc.es; xavier.teruel@bsc.es; xavier.martorell@bsc.es; eduard.ayguade@bsc.es; jesus.labarta@bsc.es; alejandro.duran@intel.com; bronis@llnl.gov; slolivi@sandia.gov; kli@ca.ibm.com; alexe@us.ibm.com RI Teruel, Xavier/H-8869-2015; Martorell, Xavier/G-6120-2015; LABARTA, JESUS/G-5256-2015 OI Teruel, Xavier/0000-0001-5181-7545; Martorell, Xavier/0000-0002-0417-3430; LABARTA, JESUS/0000-0002-7489-4727 NR 8 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER INT PUBLISHING AG PI CHAM PA GEWERBESTRASSE 11, CHAM, CH-6330, SWITZERLAND SN 0302-9743 BN 978-3-319-24595-9; 978-3-319-24594-2 J9 LECT NOTES COMPUT SC PY 2015 VL 9342 BP 189 EP 201 DI 10.1007/978-3-319-24595-9_14 PG 13 WC Computer Science, Hardware & Architecture; Computer Science, Information Systems; Computer Science, Software Engineering; Computer Science, Theory & Methods SC Computer Science GA BE6SO UT WOS:000374709400014 ER PT S AU Scogland, TRW Keasler, J Gyllenhaal, J Hornung, R de Supinski, BR Finkel, H AF Scogland, Thomas R. W. Keasler, Jeff Gyllenhaal, John Hornung, Rich de Supinski, Bronis R. Finkel, Hal BE Terboven, C DeSupinski, BR Reble, P Chapman, BM Muller, MS TI Supporting Indirect Data Mapping in OpenMP SO OPENMP: HETEROGENOUS EXECUTION AND DATA MOVEMENTS, IWOMP 2015 SE Lecture Notes in Computer Science LA English DT Proceedings Paper CT 11th International Workshop on OpenMP (IWOMP) CY OCT 01-02, 2015 CL Aachen, GERMANY AB Code-passing abstractions based on lambdas and blocks are becoming increasingly popular to capture repetitive patterns that are amenable to parallelization. These abstractions improve code mantainability and simplify choosing from a range of mechanisms to implement parallelism. Several frameworks that use this model, including RAJA and Kokkos, employ OpenMP as one of their target parallel models. However, OpenMP inadequately supports the abstraction since it frequently requires information that is not available within the abstraction. Thus, OpenMP requires access to variables and parameters not directly supplied by the base language. This paper explores the issues with supporting these abstractions in OpenMP, with a particular focus on device constructs and the aggregation and passing of OpenMP state through base language abstractions. We propose mechanisms to improve support for these abstractions and also to reduce the burden of duplication in existing OpenMP applications. C1 [Scogland, Thomas R. W.; Keasler, Jeff; Gyllenhaal, John; Hornung, Rich; de Supinski, Bronis R.] Lawrence Livermore Natl Lab, Livermore, CA USA. [Finkel, Hal] Argonne Natl Lab, Lemont, IL USA. RP Scogland, TRW (reprint author), Lawrence Livermore Natl Lab, Livermore, CA USA. EM tscogland@llnl.gov NR 3 TC 1 Z9 1 U1 0 U2 0 PU SPRINGER INT PUBLISHING AG PI CHAM PA GEWERBESTRASSE 11, CHAM, CH-6330, SWITZERLAND SN 0302-9743 BN 978-3-319-24595-9; 978-3-319-24594-2 J9 LECT NOTES COMPUT SC PY 2015 VL 9342 BP 260 EP 272 DI 10.1007/978-3-319-24595-9_19 PG 13 WC Computer Science, Hardware & Architecture; Computer Science, Information Systems; Computer Science, Software Engineering; Computer Science, Theory & Methods SC Computer Science GA BE6SO UT WOS:000374709400019 ER PT S AU Ryutova, M AF Ryutova, Margarita BA Ryutova, M BF Ryutova, M TI The Sun's Magnetic Fields SO PHYSICS OF MAGNETIC FLUX TUBE SE Astrophysics and Space Science Library LA English DT Article; Book Chapter ID MAIN-SEQUENCE STARS; RESOLUTION AB In this introductory chapter we first briefly describe some overall characteristics of the sun, and then take a closer look at the sun's magnetic surfaces. We shall see that highly advanced space and ground-based observations show various magnetic elements, their clusters, and mass flows in great detail. The chapter is concluded with the description of the magnetic skeleton of the sun showing the well-defined imprint of the photospheric magnetic field pattern at all available temperatures from low chromosphere to the outermost corona. C1 [Ryutova, Margarita] Lawrence Livermore Natl Lab, Inst Geophys & Planetary Phys, Livermore, CA 94550 USA. RP Ryutova, M (reprint author), Lawrence Livermore Natl Lab, Inst Geophys & Planetary Phys, Livermore, CA 94550 USA. NR 21 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER PI DORDRECHT PA PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0067-0057 BN 978-3-662-45243-1; 978-3-662-45242-4 J9 ASTROPHYS SPACE SC L PY 2015 VL 417 BP 1 EP 20 DI 10.1007/978-3-662-45243-1_1 D2 10.1007/978-3-662-45243-1 PG 20 WC Astronomy & Astrophysics; Physics, Atomic, Molecular & Chemical SC Astronomy & Astrophysics; Physics GA BE5EU UT WOS:000372659400002 ER PT S AU Ryutova, M AF Ryutova, Margarita BA Ryutova, M BF Ryutova, M TI Physics of Magnetic Flux Tubes Preface SO PHYSICS OF MAGNETIC FLUX TUBE SE Astrophysics and Space Science Library LA English DT Editorial Material; Book Chapter C1 [Ryutova, Margarita] Lawrence Livermore Natl Lab, Inst Geophys & Planetary Phys, Livermore, CA 94550 USA. RP Ryutova, M (reprint author), Lawrence Livermore Natl Lab, Inst Geophys & Planetary Phys, Livermore, CA 94550 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER PI DORDRECHT PA PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0067-0057 BN 978-3-662-45243-1; 978-3-662-45242-4 J9 ASTROPHYS SPACE SC L PY 2015 VL 417 BP VII EP IX D2 10.1007/978-3-662-45243-1 PG 3 WC Astronomy & Astrophysics; Physics, Atomic, Molecular & Chemical SC Astronomy & Astrophysics; Physics GA BE5EU UT WOS:000372659400001 ER PT S AU Ryutova, M AF Ryutova, Margarita BA Ryutova, M BF Ryutova, M TI A Quick Look on Small Scale Flux Tubes SO PHYSICS OF MAGNETIC FLUX TUBE SE Astrophysics and Space Science Library LA English DT Article; Book Chapter ID SOLAR MAGNETIC-FIELDS; SPHEROMAK PHYSICS EXPERIMENT; HYDRAULIC CONCENTRATION; FILAMENTARY STRUCTURE; MODEL-CALCULATIONS; SUNSPOT; CONVECTION; STABILITY; ELEMENTS; PLASMA AB In this chapter we recall some basic steps of how magnetic flux tubes were discovered and how they were viewed in their early years. During the decades after their discovery, flux tubes evolved from an interesting novelty into a founding element of solar magnetism. Today, we know that the entire magnetic field of the Sun, from sunspots to coronal loops and solar wind, has a filamentary structure. We briefly discuss the universality of filamentary structures in universe. C1 [Ryutova, Margarita] Lawrence Livermore Natl Lab, Inst Geophys & Planetary Phys, Livermore, CA 94550 USA. RP Ryutova, M (reprint author), Lawrence Livermore Natl Lab, Inst Geophys & Planetary Phys, Livermore, CA 94550 USA. NR 66 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER PI DORDRECHT PA PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0067-0057 BN 978-3-662-45243-1; 978-3-662-45242-4 J9 ASTROPHYS SPACE SC L PY 2015 VL 417 BP 21 EP 38 DI 10.1007/978-3-662-45243-1_2 D2 10.1007/978-3-662-45243-1 PG 18 WC Astronomy & Astrophysics; Physics, Atomic, Molecular & Chemical SC Astronomy & Astrophysics; Physics GA BE5EU UT WOS:000372659400003 ER PT S AU Ryutova, M AF Ryutova, Margarita BA Ryutova, M BF Ryutova, M TI Intrinsic Properties of Flux Tubes-Wave Phenomena SO PHYSICS OF MAGNETIC FLUX TUBE SE Astrophysics and Space Science Library LA English DT Article; Book Chapter AB The ensembles of small-scale magnetic elements that cover 90% of the solar surface outside sunspots and active regions are embedded in highly dynamic environment. The individual flux tubes shaken by convectivemotions and interacting with the various wave trains, such as ubiquitous 5-min oscillations and magnetosonic waves, respond to these actions in various ways. First of all they are set in motion, which in a specific situation may have oscillatory character. In this chapter we shall consider conditions that are necessary for the excitation of waves propagating along the individual flux tubes, and specify their character. C1 [Ryutova, Margarita] Lawrence Livermore Natl Lab, Inst Geophys & Planetary Phys, Livermore, CA 94550 USA. RP Ryutova, M (reprint author), Lawrence Livermore Natl Lab, Inst Geophys & Planetary Phys, Livermore, CA 94550 USA. NR 16 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER PI DORDRECHT PA PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0067-0057 BN 978-3-662-45243-1; 978-3-662-45242-4 J9 ASTROPHYS SPACE SC L PY 2015 VL 417 BP 39 EP 67 DI 10.1007/978-3-662-45243-1_3 D2 10.1007/978-3-662-45243-1 PG 29 WC Astronomy & Astrophysics; Physics, Atomic, Molecular & Chemical SC Astronomy & Astrophysics; Physics GA BE5EU UT WOS:000372659400004 ER PT S AU Ryutova, M AF Ryutova, Margarita BA Ryutova, M BF Ryutova, M TI Effects of Flux Tube Inhomogeneities and Weak Nonlinearity SO PHYSICS OF MAGNETIC FLUX TUBE SE Astrophysics and Space Science Library LA English DT Article; Book Chapter ID SPECTRAL-LINES; WAVES; WHIP; OSCILLATIONS; ATMOSPHERE AB In this chapter we shall consider some special properties of magnetic flux tubes associated with their radial and longitudinal inhomogeneities. Magnetic flux tube embedded in weakly magnetized or nonmagnetic environment and kept in dynamic equilibrium by external pressure, must be intrinsically inhomogeneous. Even if magnetic field and density inside flux tube are radially smooth across the most of its cross section, at the periphery they must have finite gradient to match the physical parameters of surrounding plasma. Besides, flux tubes in the photosphere are subject to longitudinal inhomogeneity because of sharp stratification of low atmosphere. It is remarkable that this intrinsic property of flux tubes to be inhomogeneous plays a crucial role in their ability to absorb the energy of the outer motions, carry it upward, and convert it into the heat or other forms of energy. We shall discuss some macroscopic effects associated with flux tube inhomogeneities, which, in fact, are observable. We shall also study a weakly nonlinear waves in flux tubes and show that they obey a KdV-Burgers equation and may develop into shocks and solitons. C1 [Ryutova, Margarita] Lawrence Livermore Natl Lab, Inst Geophys & Planetary Phys, Livermore, CA 94550 USA. RP Ryutova, M (reprint author), Lawrence Livermore Natl Lab, Inst Geophys & Planetary Phys, Livermore, CA 94550 USA. NR 23 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER PI DORDRECHT PA PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0067-0057 BN 978-3-662-45243-1; 978-3-662-45242-4 J9 ASTROPHYS SPACE SC L PY 2015 VL 417 BP 69 EP 98 DI 10.1007/978-3-662-45243-1_4 D2 10.1007/978-3-662-45243-1 PG 30 WC Astronomy & Astrophysics; Physics, Atomic, Molecular & Chemical SC Astronomy & Astrophysics; Physics GA BE5EU UT WOS:000372659400005 ER PT S AU Ryutova, M AF Ryutova, Margarita BA Ryutova, M BF Ryutova, M TI Flux Tube Dynamics in the Presence of Mass Flows SO PHYSICS OF MAGNETIC FLUX TUBE SE Astrophysics and Space Science Library LA English DT Article; Book Chapter ID ALFVEN WAVES; MAGNETIC-FIELDS; CORONAL HOLES; BRIGHT POINTS; SOLAR CORONA AB Mass flows observed throughout the solar atmosphere exhibit many patterns. They are observed in a wide temperature range of 3x10(4)-10(7) K, and can have a steady, unsteady, or explosive character. Their amplitudes vary from a few tenths of kms(-1) at the photosphere up to hundreds of kms(-1) in the transition region and corona. The presence of mass flows drastically changes the dynamics of magnetic structures, and most importantly, plays a crucial role in the processes of the energy production, transfer, and release. Depending on the geometry and intensity of the flow, the system of magnetic flux tubes exhibits a number of unusual phenomena that are directly observed. In this chapter, we consider mainly two effects associated with the presence of mass flows. One is the instability of negative-energy waves (NEWs) and other lies in the range of velocities beyond the instability threshold, namely the effect of mass flows on the energy transfer by the phase mixed Alfven waves. C1 [Ryutova, Margarita] Lawrence Livermore Natl Lab, Inst Geophys & Planetary Phys, Livermore, CA 94550 USA. RP Ryutova, M (reprint author), Lawrence Livermore Natl Lab, Inst Geophys & Planetary Phys, Livermore, CA 94550 USA. NR 31 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER PI DORDRECHT PA PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0067-0057 BN 978-3-662-45243-1; 978-3-662-45242-4 J9 ASTROPHYS SPACE SC L PY 2015 VL 417 BP 99 EP 135 DI 10.1007/978-3-662-45243-1_5 D2 10.1007/978-3-662-45243-1 PG 37 WC Astronomy & Astrophysics; Physics, Atomic, Molecular & Chemical SC Astronomy & Astrophysics; Physics GA BE5EU UT WOS:000372659400006 ER PT S AU Ryutova, M AF Ryutova, Margarita BA Ryutova, M BF Ryutova, M TI Collective Phenomena in Rarefied Ensembles of Flux Tubes SO PHYSICS OF MAGNETIC FLUX TUBE SE Astrophysics and Space Science Library LA English DT Article; Book Chapter ID RANDOMLY MAGNETIZED MEDIUM; SOUND-WAVES; PROPAGATION; MODES AB In the previous chapters we have considered the properties of individual flux tubes and their dynamics due to interaction with the surrounding medium. The solar atmosphere, however, consists of ensembles of flux tubes randomly distributed in space and over their parameters. In this chapter we shall consider the time-dependent response of a randomly magnetized medium to propagation of acoustic waves and unsteady wave packets. We will see that the collective phenomena resulted from these interactions lead to clear morphological effects that are observable. The character of these effects, and the associated energy input and distribution, crucially depend on the magnetic filling factor of the medium and several other factors that will be specified. C1 [Ryutova, Margarita] Lawrence Livermore Natl Lab, Inst Geophys & Planetary Phys, Livermore, CA 94550 USA. RP Ryutova, M (reprint author), Lawrence Livermore Natl Lab, Inst Geophys & Planetary Phys, Livermore, CA 94550 USA. NR 16 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER PI DORDRECHT PA PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0067-0057 BN 978-3-662-45243-1; 978-3-662-45242-4 J9 ASTROPHYS SPACE SC L PY 2015 VL 417 BP 137 EP 165 DI 10.1007/978-3-662-45243-1_6 D2 10.1007/978-3-662-45243-1 PG 29 WC Astronomy & Astrophysics; Physics, Atomic, Molecular & Chemical SC Astronomy & Astrophysics; Physics GA BE5EU UT WOS:000372659400007 ER PT S AU Ryutova, M AF Ryutova, Margarita BA Ryutova, M BF Ryutova, M TI Effects of Magnetic Flux Tubes in Helioseismology SO PHYSICS OF MAGNETIC FLUX TUBE SE Astrophysics and Space Science Library LA English DT Article; Book Chapter ID TIME-DISTANCE HELIOSEISMOLOGY; LOCAL HELIOSEISMOLOGY; SUNSPOT MODELS; FAR-SIDE; SOLAR; DIAGNOSTICS; FIELDS AB In the previous chapter we studied the response of rarefied ensembles of random magnetic flux tubes to the propagation of acoustic waves and unsteady wave packets. In this chapter we shall study how the properties of acoustic wave packets at the photospheric level, modified by presence of magnetic flux tubes flux tube, can be used for diagnostics goals. In particular, we shall study effects of flux tubes on local helioseismology based on the time-distance analysis (Duvall et al. 1993, 1996). We shall see that flux tubes strongly affect the standard methods of time-distance tomography, and allow more realistic inference of physical parameters, including flows, magnetic fields and their nonuniformities. Besides, one can study the structure of solar atmosphere by spectral features of acoustic waves using an approach in the data analysis called "Raman spectroscopy of p-modes". C1 [Ryutova, Margarita] Lawrence Livermore Natl Lab, Inst Geophys & Planetary Phys, Livermore, CA 94550 USA. RP Ryutova, M (reprint author), Lawrence Livermore Natl Lab, Inst Geophys & Planetary Phys, Livermore, CA 94550 USA. NR 22 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER PI DORDRECHT PA PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0067-0057 BN 978-3-662-45243-1; 978-3-662-45242-4 J9 ASTROPHYS SPACE SC L PY 2015 VL 417 BP 167 EP 192 DI 10.1007/978-3-662-45243-1_7 D2 10.1007/978-3-662-45243-1 PG 26 WC Astronomy & Astrophysics; Physics, Atomic, Molecular & Chemical SC Astronomy & Astrophysics; Physics GA BE5EU UT WOS:000372659400008 ER PT S AU Ryutova, M AF Ryutova, Margarita BA Ryutova, M BF Ryutova, M TI Wave Phenomena in Dense Conglomerate of Flux Tubes SO PHYSICS OF MAGNETIC FLUX TUBE SE Astrophysics and Space Science Library LA English DT Article; Book Chapter ID RANDOM INHOMOGENEITIES; P-MODES; SUNSPOT; ABSORPTION; REGION AB In this chapter, we shall consider the properties of strongly magnetized regions of the sun such as sunspots, pores, and active regions, where random magnetic flux tubes form a dense conglomerates. Physical processes and, in particular, the wave phenomena in closely packed flux tubes exhibit some distinct features that are observable and can be used for testing the structure and energetics of these regions. One of the most pronounced effects is the strong enhancement of the dissipation of the incoming wave energy, caused by large local gradients of velocity, temperature, and pressure arising at borders of neighboring small-scale inhomogeneities. C1 [Ryutova, Margarita] Lawrence Livermore Natl Lab, Inst Geophys & Planetary Phys, Livermore, CA 94550 USA. RP Ryutova, M (reprint author), Lawrence Livermore Natl Lab, Inst Geophys & Planetary Phys, Livermore, CA 94550 USA. NR 13 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER PI DORDRECHT PA PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0067-0057 BN 978-3-662-45243-1; 978-3-662-45242-4 J9 ASTROPHYS SPACE SC L PY 2015 VL 417 BP 193 EP 220 DI 10.1007/978-3-662-45243-1_8 D2 10.1007/978-3-662-45243-1 PG 28 WC Astronomy & Astrophysics; Physics, Atomic, Molecular & Chemical SC Astronomy & Astrophysics; Physics GA BE5EU UT WOS:000372659400009 ER PT S AU Ryutova, M AF Ryutova, Margarita BA Ryutova, M BF Ryutova, M TI Nonlinear Wave Phenomena in Dense Conglomerate of Flux Tubes SO PHYSICS OF MAGNETIC FLUX TUBE SE Astrophysics and Space Science Library LA English DT Article; Book Chapter ID RANDOM INHOMOGENEITIES; OSCILLATIONS; PROPAGATION; SUNSPOT; FIELDS AB Nonlinear wave phenomena in strongly inhomogeneous media have a number of specific features that are important for various physical objects where the parameters of medium change by an order of unity over scales that are small compared to the wavelength. Generally, one would expect that the presence of strong inhomogeneities may "cut" the steepening of the wave front, and thus prevent formation of shocks. We shall see that this is not always the case. In this chapter we address this problem based on properties of sunspots, and describe the procedure that allows one to obtain nonlinear equations in the presence of strong inhomogeneities. The approach involves dispersion properties of a system, and dissipative effects. The equation itself takes a form similar to KdV-Burgers equation, and thus describes corresponding scenarios of the system evolution. For example, the predominance of dissipative effects leads to damping of the primary wave at linear stage causing direct heating, or, depending on the interplay between nonlinear and dispersion effects, the process of heating may proceed either through the formation of shocks or through the storing of wave energy in a system of solitons which are later damped away. In any case, the presence of inhomogeneities results in strongly enhanced heating compared to that in homogeneous medium. C1 [Ryutova, Margarita] Lawrence Livermore Natl Lab, Inst Geophys & Planetary Phys, Livermore, CA 94550 USA. RP Ryutova, M (reprint author), Lawrence Livermore Natl Lab, Inst Geophys & Planetary Phys, Livermore, CA 94550 USA. NR 14 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER PI DORDRECHT PA PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0067-0057 BN 978-3-662-45243-1; 978-3-662-45242-4 J9 ASTROPHYS SPACE SC L PY 2015 VL 417 BP 221 EP 239 DI 10.1007/978-3-662-45243-1_9 D2 10.1007/978-3-662-45243-1 PG 19 WC Astronomy & Astrophysics; Physics, Atomic, Molecular & Chemical SC Astronomy & Astrophysics; Physics GA BE5EU UT WOS:000372659400010 ER PT S AU Ryutova, M AF Ryutova, Margarita BA Ryutova, M BF Ryutova, M TI Magnetosonic Streaming SO PHYSICS OF MAGNETIC FLUX TUBE SE Astrophysics and Space Science Library LA English DT Article; Book Chapter ID MAGNETIC-FIELDS; PHOTOSPHERE; WAVES; FLUX AB The Faraday effect in gas dynamics called acoustic streaming and its accompanying nonlinear phenomena is found to have analogies in plasma magnetohydrodynamics. A natural place where these effects occur is the solar atmosphere covered by random ensembles of magnetic flux tubes. Unlike acoustic streaming, magnetosonic streaming consisting of the generation of plasma flows by an oscillating flux tube, is accompanied by a current drive and results in a specific evolution of magnetic structures. Depending on the physical parameters of a system, a single magnetic flux tube may be either split into thinner flux tubes or be diffusively dissolved into the ambient plasma. The effect of the magnetosonic streaming on one hand, is an obvious candidate for the generation of electric currents and mass flows at magnetic flux tube sites, and, on the other hand, it determines the evolution of magnetic structures, like, e. g., their fragmentation processes, and ultimately their lifetimes. In this chapter, we shall describe the nature and origin of the magnetosonic streaming and then use the theory to explain observed regularities in the evolution of photospheric flux tubes. Some regimes will be also verified in numerical simulation. Application of these results to observed properties of photospheric flux tubes will be given both in the qualitative and quantitative analysis. C1 [Ryutova, Margarita] Lawrence Livermore Natl Lab, Inst Geophys & Planetary Phys, Livermore, CA 94550 USA. RP Ryutova, M (reprint author), Lawrence Livermore Natl Lab, Inst Geophys & Planetary Phys, Livermore, CA 94550 USA. NR 21 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER PI DORDRECHT PA PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0067-0057 BN 978-3-662-45243-1; 978-3-662-45242-4 J9 ASTROPHYS SPACE SC L PY 2015 VL 417 BP 241 EP 265 DI 10.1007/978-3-662-45243-1_10 D2 10.1007/978-3-662-45243-1 PG 25 WC Astronomy & Astrophysics; Physics, Atomic, Molecular & Chemical SC Astronomy & Astrophysics; Physics GA BE5EU UT WOS:000372659400011 ER PT S AU Ryutova, M AF Ryutova, Margarita BA Ryutova, M BF Ryutova, M TI Moving Magnetic Features (MMFs) SO PHYSICS OF MAGNETIC FLUX TUBE SE Astrophysics and Space Science Library LA English DT Article; Book Chapter ID EMERGING FLUX; SUNSPOTS; MECHANISM; MOAT AB In highly dynamic environment of sunspot areas with various sources and sink of energy, small-scale flux tubes do not in general obey the local conservation laws, nor do the ensembles of flux tubes that exhibit a complex collective phenomena. Some of the most spectacular phenomena are associated with the so-called Moving Magnetic Features, MMFs, small bipoles streaming radially outward the sunspot penumbra and exhibiting various mysterious properties. For example, they are observed to propagate faster than background mass flows and sometimes even upstream. Altogether, the properties of the MMFs are inconsistent with the energy and momentum conservation laws and require the approach of a nonconservative, energetically open systems. In this chapter we shall study these amazing features, their observed characteristics, and their impact on the overlying atmosphere. We shall apply the methods of nonconservative systems to understand their behavior. We will also see the negative energy waves in action, and associated formation of shocks and solitons. C1 [Ryutova, Margarita] Lawrence Livermore Natl Lab, Inst Geophys & Planetary Phys, Livermore, CA 94550 USA. RP Ryutova, M (reprint author), Lawrence Livermore Natl Lab, Inst Geophys & Planetary Phys, Livermore, CA 94550 USA. NR 27 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER PI DORDRECHT PA PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0067-0057 BN 978-3-662-45243-1; 978-3-662-45242-4 J9 ASTROPHYS SPACE SC L PY 2015 VL 417 BP 267 EP 298 DI 10.1007/978-3-662-45243-1_11 D2 10.1007/978-3-662-45243-1 PG 32 WC Astronomy & Astrophysics; Physics, Atomic, Molecular & Chemical SC Astronomy & Astrophysics; Physics GA BE5EU UT WOS:000372659400012 ER PT S AU Ryutova, M AF Ryutova, Margarita BA Ryutova, M BF Ryutova, M TI Reconnection of Flux Tubes-Specifics of High Plasma beta SO PHYSICS OF MAGNETIC FLUX TUBE SE Astrophysics and Space Science Library LA English DT Article; Book Chapter ID TRANSITION REGION; MAGNETIC RECONNECTION; PHOTOSPHERIC NETWORK; CORONA; SUN; DYNAMICS; ELEMENTS; EVENTS; SHEETS; PINCH AB Two fundamental mechanisms of magnetic reconnection worked out by Sweet-Parker tandem (Parker (1957); Sweet (1958) and Petschek (1964)), were both aimed to explain an enormous amount of energy produced by coronal flares. Since then extensive studies of a topological change of magnetic field resulted in a huge body of refined reconnection theories, beautiful laboratory experiments, and numerical modeling. One thing, however, remained for a long time unchanged: the subject of studies, magnetized plasma, has been a priori considered magnetically dominated, i. e., having very low plasma beta, beta = 8 pi p/B-2 << 1. It is just this condition that provides release of a huge amount of energy stored in magnetic fields due to their topological change. This simple fact dominated so strongly that during almost six decades there was no attempt to investigate the opposite situation, i. e., when topologically favorable conditions for reconnection appear in gas-dominated plasma with finite or even larger than unity plasma beta, beta = 8 pi p/B-2 >= 1. As the quest was for a large amount of magnetic energy, the case of high beta plasma (with magnetic energy less that gas-kinetic energy) did not seem promising. This, however, proved to be wrong. It turned out that in case of small-scale magnetic flux tubes under real conditions of solar photosphere, high beta reconnection is unavoidable process. In the photosphere magnetic flux, tubes buffeted by convective motions collide and reconnect. True that the photospheric reconnection does not give the immediate gain in energy, but it sets the system in strongly unstable state. Now the central problem becomes to understand how the post-reconnection products evolve. In this chapter we shall study the peculiarities of high beta reconnection, and what is more important, the post-reconnection processes. We shall see that high beta reconnection triggers various nonlinear processes that are responsible for a wide range of observed phenomena. C1 [Ryutova, Margarita] Lawrence Livermore Natl Lab, Inst Geophys & Planetary Phys, Livermore, CA 94550 USA. RP Ryutova, M (reprint author), Lawrence Livermore Natl Lab, Inst Geophys & Planetary Phys, Livermore, CA 94550 USA. NR 32 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER PI DORDRECHT PA PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0067-0057 BN 978-3-662-45243-1; 978-3-662-45242-4 J9 ASTROPHYS SPACE SC L PY 2015 VL 417 BP 299 EP 324 DI 10.1007/978-3-662-45243-1_12 D2 10.1007/978-3-662-45243-1 PG 26 WC Astronomy & Astrophysics; Physics, Atomic, Molecular & Chemical SC Astronomy & Astrophysics; Physics GA BE5EU UT WOS:000372659400013 ER PT S AU Ryutova, M AF Ryutova, Margarita BA Ryutova, M BF Ryutova, M TI Post-reconnection Processes-Shocks, Jets, and Microflares SO PHYSICS OF MAGNETIC FLUX TUBE SE Astrophysics and Space Science Library LA English DT Article; Book Chapter ID EXPLOSIVE EVENTS; PHOTOSPHERIC NETWORK; TRANSITION REGION; SUN; WAVES AB In the previous chapter, we began to study the reconnection of magnetic flux tubes under the photospheric conditions where magnetic energy is less than the gas-kinetic energy of surrounding plasma (beta >= 1). We saw that unlike a low beta reconnection that liberates large amount of magnetic energy leading to a in situ heating, high beta reconnection does not give an immediate gain in energy, but it sets the system in a highly dynamic state triggering strongly nonlinear processes. These processes, determined by the evolution of post-reconnection products, occur higher in the atmosphere at a considerable distance from the reconnection area. In this chapter, we shall study how the post-reconnection products evolve and what determines the form and energetics of their impact on the overlying atmosphere. We will see that there are three major forms of the post-reconnection outcome: (1) generation of supersonic plasma jets, (2) formation of microflares, and (3) various combinations of jets and microflares. These were found to be in a perfect agreement with observations. Moreover, multiwavelength observations show details and interrelation of a ubiquitous sequence of events that start from cancellation of photospheric magnetic fields, pass through shock formation, and result in appearence of supersonic jets, microflares, and their combinations in the overlying atmosphere. C1 [Ryutova, Margarita] Lawrence Livermore Natl Lab, Inst Geophys & Planetary Phys, Livermore, CA 94550 USA. RP Ryutova, M (reprint author), Lawrence Livermore Natl Lab, Inst Geophys & Planetary Phys, Livermore, CA 94550 USA. NR 23 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER PI DORDRECHT PA PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0067-0057 BN 978-3-662-45243-1; 978-3-662-45242-4 J9 ASTROPHYS SPACE SC L PY 2015 VL 417 BP 325 EP 350 DI 10.1007/978-3-662-45243-1_13 D2 10.1007/978-3-662-45243-1 PG 26 WC Astronomy & Astrophysics; Physics, Atomic, Molecular & Chemical SC Astronomy & Astrophysics; Physics GA BE5EU UT WOS:000372659400014 ER PT S AU Ryutova, M AF Ryutova, Margarita BA Ryutova, M BF Ryutova, M TI Photospheric Network as Energy Source for Quiet Sun Corona SO PHYSICS OF MAGNETIC FLUX TUBE SE Astrophysics and Space Science Library LA English DT Article; Book Chapter ID SOLAR-WIND AB In previous chapters, we studied post-reconnection processes resulted from interaction of photospheric flux tubes, embedded predominantly in nonmagnetic environment. Higher in the atmosphere, magnetic field preserves its filamentary structures, but is surrounded by low beta-magnetized plasma. In this chapter, we will study post-reconnection processes occurring in the arbitrarily magnetized plasma. We will see that in this case a reconnection triggers various branches of MHD shocks, and cumulation of energy occurs higher in the atmosphere reaching coronal heights and beyond. We are still dealing here with the atmosphere above the rarefied ensembles of flux tubes. Thus imprint of quiet sun at coronal heights is the most expected outcome of post-reconnection processes occurring at all levels. Moreover, these processes seem to be the reliable energy source to fuel the fast solar wind which is rooted in coronal holes outside sunspots and active regions. C1 [Ryutova, Margarita] Lawrence Livermore Natl Lab, Inst Geophys & Planetary Phys, Livermore, CA 94550 USA. RP Ryutova, M (reprint author), Lawrence Livermore Natl Lab, Inst Geophys & Planetary Phys, Livermore, CA 94550 USA. NR 26 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER PI DORDRECHT PA PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0067-0057 BN 978-3-662-45243-1; 978-3-662-45242-4 J9 ASTROPHYS SPACE SC L PY 2015 VL 417 BP 351 EP 371 DI 10.1007/978-3-662-45243-1_14 D2 10.1007/978-3-662-45243-1 PG 21 WC Astronomy & Astrophysics; Physics, Atomic, Molecular & Chemical SC Astronomy & Astrophysics; Physics GA BE5EU UT WOS:000372659400015 ER PT S AU Ryutova, M AF Ryutova, Margarita BA Ryutova, M BF Ryutova, M TI Response of the Corona to Magnetic Activity in Underlying Plage Regions SO PHYSICS OF MAGNETIC FLUX TUBE SE Astrophysics and Space Science Library LA English DT Article; Book Chapter ID PHOTOSPHERIC NETWORK; TRANSITION REGION; SOUND-WAVES; PROPAGATION AB The fact that corona is strongly inhomogeneous in space and evolves in time in very different ways means that the processes of energy production, flow, and release have several branches. The processes of the extraction of energy stored in the photosphere, strongly depend on the magnetic filling factor, i. e., whether we deal with the quiet sun network, plages, or active regions. So far we were studying rarefied ensembles of flux tubes typical to quiet sun. In this chapter, we move to denser ensembles of flux tubes typical to plages and consider the response of the upper atmosphere to magnetic activity in underlying plage regions. We will see that the character of the EUV emission above plage regions that are dominated by single polarity magnetic elements, i. e., unipolar plages, always has an amorphous shape that topologically mimics the shape of the underlying plage. Contrary to this, the EUV emission above mixed polarity plages is highly discrete and consists of sporadic localized radiative transients. Such a different response of the chromosphere/corona to unipolar and mixed polarity plages obviously implies the action of different mechanisms for energy production, flow, and release. In all cases, however, the primary energy source lies in continuous hydromagnetic activity among the photospheric magnetic fields. It is just the character of this activity, different in differently magnetized regions, that determines the processes of the extraction of energy and its transport throughout the solar atmosphere. C1 [Ryutova, Margarita] Lawrence Livermore Natl Lab, Inst Geophys & Planetary Phys, Livermore, CA 94550 USA. RP Ryutova, M (reprint author), Lawrence Livermore Natl Lab, Inst Geophys & Planetary Phys, Livermore, CA 94550 USA. NR 19 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER PI DORDRECHT PA PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0067-0057 BN 978-3-662-45243-1; 978-3-662-45242-4 J9 ASTROPHYS SPACE SC L PY 2015 VL 417 BP 373 EP 394 DI 10.1007/978-3-662-45243-1_15 D2 10.1007/978-3-662-45243-1 PG 22 WC Astronomy & Astrophysics; Physics, Atomic, Molecular & Chemical SC Astronomy & Astrophysics; Physics GA BE5EU UT WOS:000372659400016 ER PT S AU Ryutova, M AF Ryutova, Margarita BA Ryutova, M BF Ryutova, M TI Electrodynamic Coupling of Active Region Corona with the Photosphere SO PHYSICS OF MAGNETIC FLUX TUBE SE Astrophysics and Space Science Library LA English DT Article; Book Chapter ID SOLAR ATMOSPHERE; ALFVEN WAVES; TRANSITION-REGION; MAGNETIC-FIELDS; CURRENT-DRIVEN; LOOPS; CURRENTS; PLASMAS AB In the previous chapters we studied response of the chromosphere and corona to magnetic activity in the underlying quiet sun regions and both types of plages, unipolar and mixed-polarity ones. In this chapter we turn to the question how the chromosphere and corona respond to magnetic activity in the active regions where filling factor is close to unity. Our consideration will be based on a specific case favorably caught in multiwavelength observations showing the entire process from the birth and evolution of a compact active region to formation and dynamics of coronal structures above it. We then discuss a general theory based on energetically open systems of currents that may be driven into various dynamic forms via nonlinear processes with continuous flow of matter and energy. Depending on the system parameters these may be long-living steady loops showing subtle oscillations, loops in the relaxation regime, and the periodically flaring and exploding loop systems. The theory also predicts that the EUV loops must have a filamentary structure and allows one to estimate the limiting currents and critical radii of elemental filaments associated with the stability criteria. C1 [Ryutova, Margarita] Lawrence Livermore Natl Lab, Inst Geophys & Planetary Phys, Livermore, CA 94550 USA. RP Ryutova, M (reprint author), Lawrence Livermore Natl Lab, Inst Geophys & Planetary Phys, Livermore, CA 94550 USA. NR 41 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER PI DORDRECHT PA PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0067-0057 BN 978-3-662-45243-1; 978-3-662-45242-4 J9 ASTROPHYS SPACE SC L PY 2015 VL 417 BP 395 EP 432 DI 10.1007/978-3-662-45243-1_16 D2 10.1007/978-3-662-45243-1 PG 38 WC Astronomy & Astrophysics; Physics, Atomic, Molecular & Chemical SC Astronomy & Astrophysics; Physics GA BE5EU UT WOS:000372659400017 ER PT S AU Ryutova, M AF Ryutova, Margarita BA Ryutova, M BF Ryutova, M TI Fine Structure of Penumbrae: Formation and Dynamics SO PHYSICS OF MAGNETIC FLUX TUBE SE Astrophysics and Space Science Library LA English DT Article; Book Chapter ID MAGNETIC-FLUX TUBES; JET-LIKE FEATURES; SUNSPOT PENUMBRAE; FILAMENTARY STRUCTURE; KINK INSTABILITY; SCREW-PINCH; PLASMA; RESOLUTION; ELEMENTS; FIELDS AB In this chapter we shall study amazing properties of sunspot penumbra-a beautiful "crown" surrounding mature sunspots and being one of the long-standing mysteries of solar magnetism. High-resolution observations with the Swedish 1-m Solar Telescope (SST) on La Palma revealed earlier unavailable features of penumbral filaments showing their fine substructure and new properties in their dynamics (Scharmer et al. in Nature 420: 151, 2002). We shall see that these properties are associated with the nature of umbra which itself is a dense conglomerate of twisted flux tubes. Being more or less vertical in the center of sunspots, twisted and interlaced flux tubes branch out at the periphery from the "trunk" due to an ongoing reconnection processes, and arc downward to the photosphere forming the penumbral "umbrella." The twist of individual filaments, and resulted distribution of magnetic fields and temperature inside them are consistent with the onset of screw pinch instability, which in large explains the properties and behavior of penumbral filaments. C1 [Ryutova, Margarita] Lawrence Livermore Natl Lab, Inst Geophys & Planetary Phys, Livermore, CA 94550 USA. RP Ryutova, M (reprint author), Lawrence Livermore Natl Lab, Inst Geophys & Planetary Phys, Livermore, CA 94550 USA. NR 42 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER PI DORDRECHT PA PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0067-0057 BN 978-3-662-45243-1; 978-3-662-45242-4 J9 ASTROPHYS SPACE SC L PY 2015 VL 417 BP 433 EP 453 DI 10.1007/978-3-662-45243-1_17 D2 10.1007/978-3-662-45243-1 PG 21 WC Astronomy & Astrophysics; Physics, Atomic, Molecular & Chemical SC Astronomy & Astrophysics; Physics GA BE5EU UT WOS:000372659400018 ER PT S AU Ryutova, M AF Ryutova, Margarita BA Ryutova, M BF Ryutova, M TI Bow Shocks and Plasma Jetting over Penumbrae SO PHYSICS OF MAGNETIC FLUX TUBE SE Astrophysics and Space Science Library LA English DT Article; Book Chapter ID JET-LIKE FEATURES; SUNSPOT; CHROMOSPHERES; FIBRILS AB Penumbral filaments being in constant motion, reconnecting, splitting, and twisting, strongly affect the overlying atmosphere. In this chapter we shall study the response of the chromosphere to penumbral dynamics, which shows spectacular cascades of bowshocks and plasma jetting. These spectacular events are produced by the ongoing reconnection processes between neighboring penumbral filaments, basically at the periphery of sunspot where penumbral filaments become more and more horizontal. There post-reconnection products moving upward quickly accelerate. At transonic velocities a bow shock (detached) is formed in front of the accelerated flux tube, as it usually occurs in cases of blunt bodies moving with supersonic velocities. In the chromosphere bow shocks are seen in the form of elongated transients moving as a whole in a direction almost perpendicular to their long axes. On some much more rare occasions compared to "drifting" bow shock type transients, there appear compact "true" microjets moving in the radial direction, and having much higher velocities compared to bow shocks. C1 [Ryutova, Margarita] Lawrence Livermore Natl Lab, Inst Geophys & Planetary Phys, Livermore, CA 94550 USA. RP Ryutova, M (reprint author), Lawrence Livermore Natl Lab, Inst Geophys & Planetary Phys, Livermore, CA 94550 USA. NR 17 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER PI DORDRECHT PA PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0067-0057 BN 978-3-662-45243-1; 978-3-662-45242-4 J9 ASTROPHYS SPACE SC L PY 2015 VL 417 BP 455 EP 477 DI 10.1007/978-3-662-45243-1_18 D2 10.1007/978-3-662-45243-1 PG 23 WC Astronomy & Astrophysics; Physics, Atomic, Molecular & Chemical SC Astronomy & Astrophysics; Physics GA BE5EU UT WOS:000372659400019 ER PT S AU Ryutova, M AF Ryutova, Margarita BA Ryutova, M BF Ryutova, M TI Self-organization in the Corona and Flare Precursors SO PHYSICS OF MAGNETIC FLUX TUBE SE Astrophysics and Space Science Library LA English DT Article; Book Chapter ID PLASMA-WAVE ECHOES; SOLAR-FLARES; TRANSITION REGION; HELICITY INJECTION; EXPLOSIVE EVENTS; ACTIVE-REGION; CIRCUIT; FLOWS AB Exploding loop systems producing X-ray flares often, but not always, bifurcate into a long-living, well-organized system of multithreaded loop arcades resembling solenoidal slinkies. The subject of this chapter is to look into the physical conditions that cause or prevent this process. We shall see that the X-class flares that bifurcate into long-living slinky arcades have different signatures than those which do not produce such structures. The most striking difference is that, in all cases of slinky formation, a high-energy proton (HEP) flux becomes significantly enhanced 10-40 h before the flare occurs. No such effect was found prior to the "non-slinky" flares. This fact is found to be associated with the difference between energy production by a given active region and the amount of energy required to bring the entire system into the form of self-organized loop arcades. One of the important features is that post-flare coronal slinky formation is preceded by scale invariant structure formation in the underlying chromosphere/transition region. The observed regularities may serve as long-term precursors of strong flares and may help to study predictability of system behavior, and in particular, flare occurrence. We shall also discuss some aspects of recurrency of coronal microflares and flares which have signatures consistent with a spatial and temporal plasma echoes. C1 [Ryutova, Margarita] Lawrence Livermore Natl Lab, Inst Geophys & Planetary Phys, Livermore, CA 94550 USA. RP Ryutova, M (reprint author), Lawrence Livermore Natl Lab, Inst Geophys & Planetary Phys, Livermore, CA 94550 USA. NR 54 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER PI DORDRECHT PA PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0067-0057 BN 978-3-662-45243-1; 978-3-662-45242-4 J9 ASTROPHYS SPACE SC L PY 2015 VL 417 BP 479 EP 511 DI 10.1007/978-3-662-45243-1_19 D2 10.1007/978-3-662-45243-1 PG 33 WC Astronomy & Astrophysics; Physics, Atomic, Molecular & Chemical SC Astronomy & Astrophysics; Physics GA BE5EU UT WOS:000372659400020 ER PT B AU Jenks, JJ Tegrotenhuis, W Motkuri, RK Paul, BK McGrail, BP AF Jenks, J. J. Tegrotenhuis, Ward Motkuri, Radha K. Paul, Brian K. McGrail, B. Peter GP ASME TI A COMPUTATIONAL AND EXPERIMENTAL STUDY OF METAL AND COVALENT ORGANIC FRAMEWORKS USED IN ADSORPTION COOLING SO PROCEEDINGS OF THE ASME 13TH INTERNATIONAL CONFERENCE ON NANOCHANNELS, MICROCHANNELS, AND MINICHANNELS, 2015 LA English DT Proceedings Paper CT 13TH ASME International Conference on Nanochannels, Microchannels, and Minichannels CY JUL 06-09, 2015 CL San Francisco, CA SP ASME ID REFRIGERATION CYCLE; HYDROGEN STORAGE; WATER-ADSORPTION; ACTIVATED CARBON; HEAT; PERFORMANCE; BED; TEMPERATURE; SIMULATION; CHALLENGES AB Metal-organic frameworks (MOFs) have recently attracted enormous interest over the past few years due to their potential applications in energy storage and gas separation. However, there have been few reports on MOFs for adsorption cooling applications. Adsorption cooling technology is an established alternative to mechanical vapor compression refrigeration systems. Adsorption cooling is an excellent alternative in industrial environments where waste heat is available. Applications also include hybrid systems, refrigeration, power plant dry cooling, cryogenics, vehicular systems and building HVAC. Adsorption based cooling and refrigeration systems have several advantages including few moving parts and negligible power consumption. Key disadvantages include large thermal mass, bulkiness, complex controls, and low COP (0.2-0.5). We explored the use of metal organic frameworks that have very high mass loading and relatively low heats of adsorption, with certain combinations of refrigerants to demonstrate a new type of highly efficient adsorption chiller. An adsorption chiller based on MOFs suggests that a thermally driven COP>1 may be possible with these materials, which would represent a fundamental breakthrough in performance of adsorption chiller technology. Computational fluid dynamics combined with a system level lumped-parameter model have been used to project size and performance for chillers with a cooling capacity ranging from a few kW to several thousand kW. In addition, a cost model has been developed to project manufactured cost of entire systems. These systems rely on stacked micro/mini-scale architectures to enhance heat and mass transfer. Presented herein are computational and experimental results for hydrophyilic MOFs, fluorophilic MOFs and also flourophilic Covalent-organic frameworks (COFs). C1 [Jenks, J. J.; Tegrotenhuis, Ward; Motkuri, Radha K.; McGrail, B. Peter] Pacific NW Natl Lab, Richland, WA 99352 USA. [Paul, Brian K.] Oregon State Univ, Sch Mech Ind & Mfg Engn, Corvallis, OR 97331 USA. RP Jenks, JJ (reprint author), Pacific NW Natl Lab, Richland, WA 99352 USA. RI Motkuri, Radha/F-1041-2014 OI Motkuri, Radha/0000-0002-2079-4798 NR 36 TC 0 Z9 0 U1 3 U2 5 PU AMER SOC MECHANICAL ENGINEERS PI NEW YORK PA THREE PARK AVENUE, NEW YORK, NY 10016-5990 USA BN 978-0-7918-5687-1 PY 2015 AR V001T03A012 PG 10 WC Engineering, Manufacturing; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary SC Engineering; Science & Technology - Other Topics; Materials Science GA BE6IW UT WOS:000374197900017 ER PT B AU Sheng, S Guo, Y AF Sheng, Shuangwen Guo, Yi GP ASME TI AN INTEGRATED APPROACH USING CONDITION MONITORING AND MODELING TO INVESTIGATE WIND TURBINE GEARBOX DESIGN SO PROCEEDINGS OF THE ASME TURBO EXPO: TURBINE TECHNICAL CONFERENCE AND EXPOSITION, 2015, VOL 9 LA English DT Proceedings Paper CT ASME Turbo Expo: Turbine Technical Conference and Exposition CY JUN 15-19, 2015 CL Montreal, CANADA SP Int Gas Turbine Inst DE Wind turbine; condition monitoring; gearbox modeling; design; analysis AB Vibration-based condition monitoring (CM) of geared utility-scale turbine drivetrains has been used by the wind industry to help improve operation and maintenance (O&M) practices, increase turbine availability, and reduce O&M cost. This study is a new endeavor that integrates the vibration-based CM technique with wind turbine gearbox modeling to investigate various gearbox design options. A team of researchers performed vibration-based CM measurements on a damaged wind turbine gearbox with a classic configuration, (i.e., one planetary stage and two parallel stages). We observed that the acceleration amplitudes around the first-order sidebands of the intermediate stage gear set meshing frequency were much lower than that measured at the high-speed gear set, and similar difference was also observed in a healthy gearbox. One factor for a reduction at the intermediate stage gear set is hypothesized to be the soft sun-spline configuration in the test gearbox. To evaluate this hypothesis, a multibody dynamic model of the healthy test gearbox was first developed and validated. Relative percent difference of the first-order sidebands of the highspeed and intermediate stage gear-meshing frequencies in the soft and the rigid sun spline configurations were compared. The results verified that the soft sun-spline configuration can reduce the sidebands of the intermediate stage gear set and also the locating bearing loads. The study demonstrates that combining vibration-based CM with appropriate modeling can provide insights for evaluating different wind turbine gearbox design options. C1 [Sheng, Shuangwen; Guo, Yi] Natl Renewable Energy Lab, Golden, CO USA. RP Sheng, S (reprint author), Natl Renewable Energy Lab, Golden, CO USA. EM shuangwen.sheng@nrel.gov; yi.guo@nrel.gov NR 17 TC 0 Z9 0 U1 2 U2 2 PU AMER SOC MECHANICAL ENGINEERS PI NEW YORK PA THREE PARK AVENUE, NEW YORK, NY 10016-5990 USA BN 978-0-7918-5680-2 PY 2015 AR UNSP V009T46A025 PG 8 WC Energy & Fuels; Engineering, Petroleum; Engineering, Mechanical SC Energy & Fuels; Engineering GA BE6PP UT WOS:000374508400064 ER PT S AU Ryutova, M AF Ryutova, Margarita BA Ryutova, M BF Ryutova, M TI Quiescent Prominences SO PHYSICS OF MAGNETIC FLUX TUBE SE Astrophysics and Space Science Library LA English DT Article; Book Chapter ID MAGNETIC-FIELDS; DYNAMICS; PLASMA; INSTABILITY; STABILITY; FLUX; EQUILIBRIUM; EVOLUTION; PLUMES AB In this chapter we shall consider dynamics of quiescent prominences. These amazing phenomena offer excellent opportunity to study fundamental properties of various plasma instabilities, and also address to some of the most enigmatic features of solar atmosphere. We shall combine the observational evidence and theory to identify such instabilities as: (1) prominence cavity formation and its evolution, associated with a large scale screw pinch instability; (2) development of regular series of plumes and spikes typical to the Rayleigh-Taylor (RT) instability; and (3) the appearance of growing ripples at the prominence/corona interface, often followed by a sudden collimated mass up-and downflows, attributed to the Kelvin-Helmholtz (KH) instability. We shall specify the conditions for transition from a linear (rippling mode) to nonlinear stage of the KH instability, known to have an explosive character. We show examples of a practical use of direct measurements of the instability parameters and also briefly discuss the natural occurrence of greenhouse-like effect under prominence body. C1 [Ryutova, Margarita] Lawrence Livermore Natl Lab, Inst Geophys & Planetary Phys, Livermore, CA 94550 USA. RP Ryutova, M (reprint author), Lawrence Livermore Natl Lab, Inst Geophys & Planetary Phys, Livermore, CA 94550 USA. NR 44 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER PI DORDRECHT PA PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0067-0057 BN 978-3-662-45243-1; 978-3-662-45242-4 J9 ASTROPHYS SPACE SC L PY 2015 VL 417 BP 513 EP 541 DI 10.1007/978-3-662-45243-1_20 D2 10.1007/978-3-662-45243-1 PG 29 WC Astronomy & Astrophysics; Physics, Atomic, Molecular & Chemical SC Astronomy & Astrophysics; Physics GA BE5EU UT WOS:000372659400021 ER PT J AU Tamura, N Kunz, M AF Tamura, Nobumichi Kunz, Martin TI A concise synchrotron X-ray microdiffraction field guide for the Earth scientists SO BOLETIN DE LA SOCIEDAD GEOLOGICA MEXICANA LA English DT Article DE X-ray microdiffraction; synchrotron; Laue diffraction; powder diffraction; stress; microstructure ID RIETVELD REFINEMENT; LAUE MICRODIFFRACTION; MICRO-DIFFRACTION; ELASTIC STRAIN; RESOLUTION; DETECTOR; BEAMLINE; TEXTURE; STRESS; ELECTROMIGRATION AB Most geological samples are intrinsically heterogeneous at the micron scale making their quantitative study with conventional laboratory techniques challenging. The use of synchrotron radiation, which provides high quality data with unprecedented spatial and angular resolution, has become quite ubiquitous in many branches of experimental sciences, and geology, geochemistry, Earth and environmental sciences are no exception. The present chapter offers an overview of what can be measured using synchrotron X-ray microdiffraction using an X-ray beam size in the range between 100 nm to a few microns. Experiments using geological samples are described. Two techniques, their strengths and limitations, are emphasized: powder microdiffraction and Laue microdiffraction. C1 [Tamura, Nobumichi; Kunz, Martin] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, 1 Cyclotron Rd, Berkeley, CA 94720 USA. RP Tamura, N (reprint author), Univ Calif Berkeley, Lawrence Berkeley Natl Lab, 1 Cyclotron Rd, Berkeley, CA 94720 USA. EM ntamura@lbl.gov FU Office of Science, Office of Basic Energy Sciences of the U.S. Department of Energy at the Lawrence Berkeley National Laboratory (LBNL) [DE-AC02-05CH11231] FX The Advanced Light Source (ALS) is supported by the Director, Office of Science, Office of Basic Energy Sciences of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231 at the Lawrence Berkeley National Laboratory (LBNL). The authors would like to thank the reviewers for their useful comments on how to improve the manuscript. NR 74 TC 0 Z9 0 U1 2 U2 2 PU UNIV NACIONAL AUTONOMA MEXICO, INST GEOGRAFIA PI COYOACAN C P PA CIUDAD UNIV, FAC ECONOMIA, CIRCUITO INTEROR S-N, 1ER PISO, EDIFICIO B, COYOACAN C P, 04510, MEXICO SN 1405-3322 J9 B SOC GEOL MEX JI Bol. Soc. Geol. Mex. PY 2015 VL 67 IS 3 BP 467 EP 478 PG 12 WC Geology SC Geology GA DJ9GP UT WOS:000374522300019 ER PT B AU Grudzinski, JJ Fischer, R Talaga, RL Guarino, V Pla-Dalmau, A Fagan, JE Grozis, C AF Grudzinski, J. J. Fischer, R. Talaga, R. L. Guarino, V. Pla-Dalmau, A. Fagan, J. E. Grozis, C. GP ASME TI EVALUATION OF MECHANICAL PROPERTIES AT THE KNIT LINE INTERFACE IN A COMPLEX MULTI-CELL PVC EXTRUSION SO PROCEEDINGS OF THE ASME INTERNATIONAL MECHANICAL ENGINEERING CONGRESS AND EXPOSITION, 2014, VOL 14 LA English DT Proceedings Paper CT ASME International Mechanical Engineering Congress and Exposition (IMECE2014) CY NOV 14-20, 2014 CL Montreal, CANADA SP ASME AB In order to form internal cells in PVC extrusions, the die requires an insert or internal member that the material flows past. These inserts are supported to the outer die structure by so-called spiders that pass through to the outer wall of the extrusion die. The extruded material must separate and then recombine as it passes over the spider. The material must then form a bond at this interface shortly before exiting the die. These interfaces are referred to as knit-lines. In a recent project involving a large and complex PVC extrusion, difficulty was encountered in developing these knit lines within the webs of the extrusions. Upon visual inspection, these interfaces appeared to be without bond over portions of the cross section. However, mechanical testing in the worst knits revealed that bonding had occurred with the knit providing 85% of the bulk material strength although without supporting any significant ductility. At the same time, knits at different parts of the extrusions showed ductility comparable with the base material. Altering the process variables showed a means for improvement in the webs but this was limited by other constraints. In this work we describe the character of the knitlines and the resulting mechanical properties along with the testing methodology. C1 [Grudzinski, J. J.; Fischer, R.; Talaga, R. L.; Guarino, V.] Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. [Pla-Dalmau, A.; Fagan, J. E.; Grozis, C.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Grudzinski, JJ (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. EM jjg@anl.gov NR 5 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC MECHANICAL ENGINEERS PI NEW YORK PA THREE PARK AVENUE, NEW YORK, NY 10016-5990 USA BN 978-0-7918-4963-7 PY 2015 AR V014T11A048 PG 8 WC Engineering, Mechanical; Materials Science, Multidisciplinary SC Engineering; Materials Science GA BE6KR UT WOS:000374279300084 ER PT B AU Momen, AM Abdelaziz, O Gluesenkamp, K Vineyard, E Benedict, M AF Momen, Ayyoub Mehdizadeh Abdelaziz, Omar Gluesenkamp, Kyle Vineyard, Edward Benedict, Michael GP ASME TI THERMOFLUID ANALYSIS OF MAGNETOCALORIC REFRIGERATION SO PROCEEDINGS OF THE ASME INTERNATIONAL MECHANICAL ENGINEERING CONGRESS AND EXPOSITION, 2014, VOL 14 LA English DT Proceedings Paper CT ASME International Mechanical Engineering Congress and Exposition (IMECE2014) CY NOV 14-20, 2014 CL Montreal, CANADA SP ASME DE Magnetocaloric refrigeration; Non-dimensional analysis; Active magnetic regeneration ID THERMODYNAMICS AB While there have been extensive studies on thermofluid characteristics of different magnetocaloric refrigeration systems, a conclusive optimization study using non dimensional parameters which can be applied to a generic system has not been reported yet. In this study, a numerical model has been developed for optimization of active magnetic refrigerator (AMR). This model is computationally efficient and robust, making it appropriate for running the thousands of simulations required for parametric study and optimization. The governing equations have been non-dimensionalized and numerically, solved using finite difference method. A parametric study on a wide range of non-dimensional numbers has been performed. While the goal of AMR systems is to improve the performance of competitive parameters including COP, cooling capacity and temperature span, new parameters called "AMR performance index-1" have been introduced in order to perform multi objective optimization and simultaneously exploit all these parameters. The multi-objective optimization is carried out for a wide range of the non-dimensional parameters. The results of this study will provide general guidelines for designing high performance AMR systems. C1 [Momen, Ayyoub Mehdizadeh] Oak Ridge Natl Lab, Bldg Equipment Res Grp, Oak Ridge, TN USA. [Abdelaziz, Omar; Gluesenkamp, Kyle; Vineyard, Edward] Oak Ridge Natl Lab, Oak Ridge, TN USA. [Benedict, Michael] GE Appliances, Louisville, KY USA. RP Momen, AM (reprint author), Oak Ridge Natl Lab, Bldg Equipment Res Grp, Oak Ridge, TN USA. EM momena@ornl.gov NR 20 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC MECHANICAL ENGINEERS PI NEW YORK PA THREE PARK AVENUE, NEW YORK, NY 10016-5990 USA BN 978-0-7918-4963-7 PY 2015 AR V014T06A004 PG 6 WC Engineering, Mechanical; Materials Science, Multidisciplinary SC Engineering; Materials Science GA BE6KR UT WOS:000374279300004 ER PT B AU Sabau, AS Porter, WD Roy, S Shyam, A AF Sabau, Adrian S. Porter, Wallace D. Roy, Shibayan Shyam, Amit GP ASME TI PROCESS SIMULATION ROLE IN THE DEVELOPMENT OF NEW ALLOYS BASED ON AN INTEGRATED COMPUTATIONAL MATERIALS ENGINEERING APPROACH SO PROCEEDINGS OF THE ASME INTERNATIONAL MECHANICAL ENGINEERING CONGRESS AND EXPOSITION, 2014, VOL 14 LA English DT Proceedings Paper CT ASME International Mechanical Engineering Congress and Exposition (IMECE) CY NOV 14-20, 2014 CL Montreal, CANADA SP ASME ID EQUIAXED DENDRITIC GROWTH; SOLUTE DIFFUSION-MODEL; CASTING SOLIDIFICATION; PARADIGM; PROMISE; PROJECT AB To accelerate the introduction of new materials and components, the development of metal casting processes requires the teaming between different disciplines, as multi physical phenomena have to be considered simultaneously for the process design and optimization for mechanical properties. The required models for physical phenomena as well as their validation status for metal casting are reviewed. The data on materials properties, model validation, and relevant microstructure for materials properties are highlighted. One vehicle to accelerate the development of new materials is through combined experimental-computational efforts. Integrated computational/experimental practices are reviewed; strengths and weaknesses are identified with respect to metal casting processes. Specifically, the examples are given for the knowledge base established at Oak Ridge National Laboratory and computer models for predicting casting defects and microstructure distribution in aluminum alloy components. C1 [Sabau, Adrian S.; Porter, Wallace D.; Roy, Shibayan; Shyam, Amit] Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA. RP Sabau, AS (reprint author), Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA. NR 29 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC MECHANICAL ENGINEERS PI NEW YORK PA THREE PARK AVENUE, NEW YORK, NY 10016-5990 USA BN 978-0-7918-4963-7 PY 2015 AR V014T11A007 PG 9 WC Engineering, Mechanical; Materials Science, Multidisciplinary SC Engineering; Materials Science GA BE6KR UT WOS:000374279300043 ER PT S AU Rodriguez, P Wohlberg, B AF Rodriguez, Paul Wohlberg, Brendt GP IEEE TI TRANSLATIONAL AND ROTATIONAL JITTER INVARIANT INCREMENTAL PRINCIPAL COMPONENT PURSUIT FOR VIDEO BACKGROUND MODELING SO 2015 IEEE INTERNATIONAL CONFERENCE ON IMAGE PROCESSING (ICIP) SE IEEE International Conference on Image Processing ICIP LA English DT Proceedings Paper CT IEEE International Conference on Image Processing (ICIP) CY SEP 27-30, 2015 CL Quebec City, CANADA SP Inst Elect & Elect Engineers, IEEE Signal Proc Soc DE Principal Component Pursuit; Video Background Modeling; Rigid transformations ID IMAGES AB While Principal Component Pursuit (PCP) is currently considered to be the state of the art method for video background modeling, it suffers from a number of limitations, including a high computational cost, a batch operating mode, and sensitivity to camera jitter. In this paper we propose a novel fully incremental PCP algorithm for video background modeling that is robust to translational and rotational jitter. It processes one frame at a time, obtaining similar results to standard batch PCP algorithms, while being able to deal with translational and rotational jitter. It also has extremely low memory footprint, and a computational complexity that allows almost real-time processing. C1 [Rodriguez, Paul] Pontificia Univ Catolica Peru, Dept Elect Engn, Lima, Peru. [Wohlberg, Brendt] Los Alamos Natl Lab, Appl Math & Plasma Phys T 5, POB 1663, Los Alamos, NM 87545 USA. RP Rodriguez, P (reprint author), Pontificia Univ Catolica Peru, Dept Elect Engn, Lima, Peru. NR 23 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1522-4880 BN 978-1-4799-8339-1 J9 IEEE IMAGE PROC PY 2015 BP 537 EP 541 PG 5 WC Engineering, Electrical & Electronic; Imaging Science & Photographic Technology SC Engineering; Imaging Science & Photographic Technology GA BE4NP UT WOS:000371977800111 ER PT S AU Sreehari, S Venkatakrishnan, SV Drummy, L Simmons, J Bouman, CA AF Sreehari, Suhas Venkatakrishnan, S. V. Drummy, Lawrence Simmons, Jeff Bouman, Charles A. GP IEEE TI ROTATIONALLY-INVARIANT NON-LOCAL MEANS FOR IMAGE DENOISING AND TOMOGRAPHY SO 2015 IEEE INTERNATIONAL CONFERENCE ON IMAGE PROCESSING (ICIP) SE IEEE International Conference on Image Processing ICIP LA English DT Proceedings Paper CT IEEE International Conference on Image Processing (ICIP) CY SEP 27-30, 2015 CL Quebec City, CANADA SP Inst Elect & Elect Engineers, IEEE Signal Proc Soc DE Rotationally-invariant NLM; denoising; tomography; plug-and-play; prior modeling AB Many samples imaged in structural biology and material science contain several similar particles at random locations and orientations. Model-based iterative reconstruction (MBIR) methods can in principle be used to exploit such redundancies in images through log prior probabilities that accurately account for non-local similarity between the particles. However, determining such a log prior term can be challenging. Several denoising algorithms like non-local means (NLM) successfully capture such non-local redundancies, but the problem is two-fold: NLM is not explicitly formulated as a cost function, and neither can it capture similarity between randomly oriented particles. In this paper, we propose a rotationally-invariant nonlocal means (RINLM) algorithm, and describe a method to implement RINLM as a prior model using a novel framework that we call plug-and-play priors. We introduce the idea of patch pre-rotation to make RINLM computationally tractable. Finally, we showcase image denoising and 2D tomography results, using the proposed RINLM algorithm, as we highlight high reconstruction quality, image sharpness, and artifact suppression. C1 [Sreehari, Suhas; Bouman, Charles A.] Purdue Univ, Elect & Comp Engn, W Lafayette, IN 47907 USA. [Venkatakrishnan, S. V.] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. [Drummy, Lawrence; Simmons, Jeff] Air Force Res Lab, Dayton, OH 45433 USA. RP Sreehari, S (reprint author), Purdue Univ, Elect & Comp Engn, W Lafayette, IN 47907 USA. NR 22 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1522-4880 BN 978-1-4799-8339-1 J9 IEEE IMAGE PROC PY 2015 BP 542 EP 546 PG 5 WC Engineering, Electrical & Electronic; Imaging Science & Photographic Technology SC Engineering; Imaging Science & Photographic Technology GA BE4NP UT WOS:000371977800112 ER PT S AU Boukhanovsky, AV Ilyin, VA Krzhizhanovskaya, VV Athanassoulis, GA Klimentov, AA Sloot, PMA AF Boukhanovsky, Alexander V. Ilyin, Viacheslav A. Krzhizhanovskaya, Valeria V. Athanassoulis, Gerassimos A. Klimentov, Alexei A. Sloot, Peter M. A. BE Sloot, P Boukhanovsky, A Athanassoulis, G Klimentov, A TI Young researchers advancing computational science: Perspectives of the Young Scientists Conference 2015 SO 4TH INTERNATIONAL YOUNG SCIENTIST CONFERENCE ON COMPUTATIONAL SCIENCE SE Procedia Computer Science LA English DT Proceedings Paper CT 4th International Young Scientists Conference on Computational Science (YSC) CY JUN 25-JUL 03, 2015 CL Athens, GREECE DE computational science; international conference; young scientists; leading scientist program AB We present an annual international Young Scientists Conference (YSC) on computational science http://ysc.escience.ifmo.ru/, which brings together renowned experts and young researchers working in high-performance computing, data-driven modeling, and simulation of large-scale complex systems. The first YSC event was organized in 2012 by the University of Amsterdam, the Netherlands and ITMO University, Russia with the goal of opening a dialogue on the present and the future of computational science and its applications. We believe that the YSC conferences will strengthen the ties between young scientists in different countries, thus promoting future collaboration. In this paper we briefly introduce the challenges the millennial generation is facing; describe the YSC conference history and topics; and list the keynote speakers and program committee members. This volume of Procedia Computer Science presents selected papers from the 4th International Young Scientists Conference on Computational Science held on 25 June - 3 July 2015 in Athens, Greece. C1 [Boukhanovsky, Alexander V.; Krzhizhanovskaya, Valeria V.; Athanassoulis, Gerassimos A.; Sloot, Peter M. A.] ITMO Univ, St Petersburg, Russia. [Ilyin, Viacheslav A.; Klimentov, Alexei A.] IV Kurchatov Atom Energy Inst, Natl Res Ctr, Moscow 123182, Russia. [Krzhizhanovskaya, Valeria V.; Sloot, Peter M. A.] Univ Amsterdam, NL-1012 WX Amsterdam, Netherlands. [Athanassoulis, Gerassimos A.] Natl Tech Univ Athens, GR-10682 Athens, Greece. [Klimentov, Alexei A.] CERN, Meyrin, Switzerland. [Klimentov, Alexei A.] Brookhaven Natl Lab, Upton, NY 11973 USA. [Sloot, Peter M. A.] Nanyang Technol Univ, Singapore 639798, Singapore. RP Boukhanovsky, AV (reprint author), ITMO Univ, St Petersburg, Russia. EM Boukhanovsky@mail.ifmo.ru; Ilyin@theory.sinp.msu.ru; V.Krzhizhanovskaya@uva.nl; Mathan@central.ntua.gr; Alexei.Klimentov@cern.ch; P.M.A.Sloot@uva.nl NR 2 TC 0 Z9 0 U1 1 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA SARA BURGERHARTSTRAAT 25, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1877-0509 J9 PROCEDIA COMPUT SCI PY 2015 VL 66 BP 1 EP 4 DI 10.1016/j.procs.2015.11.002 PG 4 WC Computer Science, Theory & Methods; Engineering, Electrical & Electronic SC Computer Science; Engineering GA BE6AW UT WOS:000373782500001 ER PT S AU Megino, FB De, K Caballero, J Hover, J Klimentov, A Maeno, T Nilsson, P Oleynik, D Padolski, S Panitkin, S Petrosyan, A Wenaus, T AF Megino, Fernando Barreiro De, Kaushik Caballero, Jose Hover, John Klimentov, Alexei Maeno, Tadashi Nilsson, Paul Oleynik, Danila Padolski, Sergey Panitkin, Sergey Petrosyan, Artem Wenaus, Torre CA ATLAS Collaboration BE Sloot, P Boukhanovsky, A Athanassoulis, G Klimentov, A TI PanDA: evolution and recent trends in LHC computing SO 4TH INTERNATIONAL YOUNG SCIENTIST CONFERENCE ON COMPUTATIONAL SCIENCE SE Procedia Computer Science LA English DT Proceedings Paper CT 4th International Young Scientists Conference on Computational Science (YSC) CY JUN 25-JUL 03, 2015 CL Athens, GREECE DE Workload Management System; ATLAS; Grid Computing; Cloud Computing; HPC AB The Large Hadron Collider(LHC) is the world's largest and most powerful machine. It started operating in 2009 with a scientific program foreseen to extend over the next coming decades at increasing energies and luminosities to maximise the discovery potential. During Run1 (20092013), the Worldwide LHC Computing Grid (WLCG) successfully delivered all the necessary computing resources, which made the discovery of the Higgs Boson possible. Looking ahead, it is forecasted that increased luminosities will extrapolate to a multiplicity in the storage and processing costs, which is not reflected in a corresponding funding growth of the WLCG. ATLAS, one of the four experiments at the LHC, is therefore leading an upgrade program to evolve their software and computing model to make the best possible usage of available resources, and also leverage on upcoming state of the art computing paradigms that could make important resource contributions. These proceedings will give an insight into the accompanying work in PanDA, ATLAS' workload management system. PanDA has implemented event level bookkeeping and dynamic generation of jobs with tailored lengths, in order to integrate and optimise the usage of opportunistic resources, e.g. Cloud Computing or High Performance Computing (HPC). In conjunction, the Event Service has been developed as a way to manage fine grained jobs and its outputs. Usage examples on some of the leading commercial and research infrastructures will be given. In addition, we will describe the work on further exploiting the current network capabilities by allowing remote data access and reducing regional boundaries. C1 [Megino, Fernando Barreiro; De, Kaushik; Oleynik, Danila] Univ Texas Arlington, Arlington, TX 76019 USA. [Caballero, Jose; Hover, John; Klimentov, Alexei; Maeno, Tadashi; Nilsson, Paul; Padolski, Sergey; Panitkin, Sergey; Wenaus, Torre] Brookhaven Natl Lab, Upton, NY 11973 USA. [Petrosyan, Artem] Joint Inst Nucl Res, Dubna, Russia. RP Megino, FB (reprint author), Univ Texas Arlington, Arlington, TX 76019 USA. NR 11 TC 0 Z9 0 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA SARA BURGERHARTSTRAAT 25, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1877-0509 J9 PROCEDIA COMPUT SCI PY 2015 VL 66 BP 439 EP 447 DI 10.1016/j.procs.2015.11.050 PG 9 WC Computer Science, Theory & Methods; Engineering, Electrical & Electronic SC Computer Science; Engineering GA BE6AW UT WOS:000373782500049 ER PT S AU Golosova, M Grigorieva, M Klimentov, A Ryabinkin, E AF Golosova, M. Grigorieva, M. Klimentov, A. Ryabinkin, E. BE Sloot, P Boukhanovsky, A Athanassoulis, G Klimentov, A TI PanDA Workload Management System meta-data segmentation SO 4TH INTERNATIONAL YOUNG SCIENTIST CONFERENCE ON COMPUTATIONAL SCIENCE SE Procedia Computer Science LA English DT Proceedings Paper CT 4th International Young Scientists Conference on Computational Science (YSC) CY JUN 25-JUL 03, 2015 CL Athens, GREECE DE PanDA; workload management system; meta-data segmentation; hybrid storage AB The PanDA (Production and Distributed Analysis) workload management system (WMS) was developed to meet the scale and complexity of LHC distributed computing for the ATLAS experiment. PanDA currently distributes jobs among more than 100,000 cores at well over 120 Grid sites, supercomputing centers, commercial and academic clouds. ATLAS physicists submit more than 1.5M data processing, simulation and analysis PanDA jobs per day, and the system keeps all metainformation about job submissions and execution events in Oracle RDBMS. The above information is used for monitoring and accounting purposes. One of the most challenging monitoring issues is tracking errors that has occurred during the execution of the jobs. Current meta-data storage technology doesn't support inner tools for data aggregation, needed to build error summary tables, charts and graphs. Delegating these tasks to the monitor slows down the execution of requests. We will describe a project aimed at optimizing interaction between PanDA front-end and back-end, by meta-data storage segmentation into two parts -operational and archived. Active meta-data are remained in Oracle database (operational part), due to the high requirements for data integrity. Historical (read-only) meta-data used for the system analysis and accounting are exported to NoSQL storage (archived part). New data model based on usage of Cassandra as the NoSQL backend has been designed as a set of query-specific data structures. This allowed to remove most of data preparation workload from PanDA Monitor and improve its scalability and performance. Segmentation and synchronization between operational and archived parts of jobs meta-data is provided by a Hybrid Meta-data Storage Framework (HMSF). PanDA monitor was partly adopted to interact with HMSF. The operational data queries are forwarded to the primary SQL-based repository and the analytic data requests are processed by NoSQL database. The results of performance and scalability tests of HMSFadopted part of PanDA Monitor shows that presented method of optimization, in conjunction with a properly configured NoSQL database and reasonable data model, provides performance improvements and scalability. C1 [Golosova, M.; Grigorieva, M.; Ryabinkin, E.] Natl Res Ctr Kurchatov Inst, Moscow, Russia. [Klimentov, A.] Brookhaven Natl Lab, Upton, NY 11973 USA. RP Golosova, M (reprint author), Natl Res Ctr Kurchatov Inst, Moscow, Russia. EM marina.golosova@cern.ch; maria.grigorieva@cern.ch; alexei.klimentov@cern.ch; rea@grid.kiae.ru NR 3 TC 0 Z9 0 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA SARA BURGERHARTSTRAAT 25, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1877-0509 J9 PROCEDIA COMPUT SCI PY 2015 VL 66 BP 448 EP 457 DI 10.1016/j.procs.2015.11.051 PG 10 WC Computer Science, Theory & Methods; Engineering, Electrical & Electronic SC Computer Science; Engineering GA BE6AW UT WOS:000373782500050 ER PT S AU Adelman, J Ancu, LS Annovi, A Baines, J Britzger, D Ehrenfeld, W Giannetti, P Luongo, C Pandini, C Schmitt, S Stewart, G Tompkins, L Vaniachine, A Volpi, G AF Adelman, Jahred Ancu, Lucian Stefan Annovi, Alberto Baines, John Britzger, Daniel Ehrenfeld, Wolfgang Giannetti, Paola Luongo, Carmela Pandini, Carlo Schmitt, Stefan Stewart, Graeme Tompkins, Lauren Vaniachine, Alexandre Volpi, Guido CA ATLAS Collaboration BE Sloot, P Boukhanovsky, A Athanassoulis, G Klimentov, A TI ATLAS FTK challenge: simulation of a billion-fold hardware parallelism SO 4TH INTERNATIONAL YOUNG SCIENTIST CONFERENCE ON COMPUTATIONAL SCIENCE SE Procedia Computer Science LA English DT Proceedings Paper CT 4th International Young Scientists Conference on Computational Science (YSC) CY JUN 25-JUL 03, 2015 CL Athens, GREECE DE simulation of real-world systems; computational technologies; big data processing AB During the current LHC shutdown period the ATLAS experiment will upgrade the Trigger and Data Acquisition system to include a hardware tracker coprocessor: the Fast TracKer (FTK). The FTK receives data from the 80 million of channels of the ATLAS silicon detector, identifying charged tracks and reconstructing their parameters at a rate of up to 100 KHz and within 100 microseconds. To achieve this performance, the FTK system identifies candidate tracks utilizing the computing power of a custom ASIC chip with associative memory (AM) designed to perform "pattern matching" at very high speed; track parameters are then calculated using modern FPGAs. A detailed simulation of this massive system has been developed with the goal of supporting the hardware design and studying its impact in the ATLAS online event selection at high LHC luminosities. We present the issues related to emulating FTK on a general-purpose CPU platform, using ATLAS computing Grid resources, and the solutions developed in order to mitigate these problems and allow the studies required to support the system design, construction and installation. C1 [Adelman, Jahred] No Illinois Univ, De Kalb, IL 60115 USA. [Ancu, Lucian Stefan] Univ Geneva, Geneva, Switzerland. [Annovi, Alberto] Ist Nazl Fis Nucl, Nazl Frascati Lab, I-00044 Frascati, Italy. [Baines, John] STFC Rutherford Appleton Lab, Oxford, England. [Britzger, Daniel; Schmitt, Stefan] DESY, Hamburg, Germany. [Britzger, Daniel; Schmitt, Stefan] DESY, Zeuthen, Germany. [Ehrenfeld, Wolfgang] Univ Bonn, Bonn, Germany. [Giannetti, Paola; Luongo, Carmela] Ist Nazl Fis Nucl, Sez Pisa, Pisa, Italy. [Pandini, Carlo] LPHNE, Paris, France. [Stewart, Graeme] Univ Glasgow, Glasgow G12 8QQ, Lanark, Scotland. [Tompkins, Lauren] Stanford Univ, Stanford, CA 94305 USA. [Vaniachine, Alexandre] Argonne Natl Lab, Argonne, IL 60439 USA. [Volpi, Guido] Univ Pisa, Pisa, Italy. RP Adelman, J (reprint author), No Illinois Univ, De Kalb, IL 60115 USA. NR 9 TC 0 Z9 0 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA SARA BURGERHARTSTRAAT 25, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1877-0509 J9 PROCEDIA COMPUT SCI PY 2015 VL 66 BP 540 EP 545 DI 10.1016/j.procs.2015.11.061 PG 6 WC Computer Science, Theory & Methods; Engineering, Electrical & Electronic SC Computer Science; Engineering GA BE6AW UT WOS:000373782500060 ER PT S AU Aulov, V De, K Drizhuk, D Klimentov, A Krasnopevtsev, D Mashinistov, R Novikov, A Oleynik, D Poyda, A Ryabinkin, E Tertychnyy, I Teslyuk, A AF Aulov, V. De, K. Drizhuk, D. Klimentov, A. Krasnopevtsev, D. Mashinistov, R. Novikov, A. Oleynik, D. Poyda, A. Ryabinkin, E. Tertychnyy, I. Teslyuk, A. BE Sloot, P Boukhanovsky, A Athanassoulis, G Klimentov, A TI Workload Management Portal for High Energy Physics applications and compute intensive science SO 4TH INTERNATIONAL YOUNG SCIENTIST CONFERENCE ON COMPUTATIONAL SCIENCE SE Procedia Computer Science LA English DT Proceedings Paper CT 4th International Young Scientists Conference on Computational Science (YSC) CY JUN 25-JUL 03, 2015 CL Athens, GREECE DE Workload Management Systems; High Energy Physics; compute intensive science; PanDA; supercomputer AB Creation of global e-Infrastructure involves an integration of isolated local resources into common heterogeneous computing environment. In 2014 a pioneering work to develop a large scale data-and task-management system for federated heterogeneous resources has been started at the National Research Centre "Kurchatov Institute" (NRC KI, Moscow). As a part of this work, we have designed, developed and deployed a portal to submit payloads to heterogeneous computing infrastructure. It combines Tier-1, Cloud-infrastructure, and a supercomputer at the Kurchatov institute. This portal is aimed to provide a common interface to submit tasks to Grid sites, commercial and academic clouds and supercomputers. Integration of Tier-1 and the supercomputer has allowed to notably increase total CPU capacity available for Large Hadron Collider (LHC) experiments. The portal can be used not only for High Energy Physics (HEP) applications, but also for other compute-intensive sciences such as bioinformatics with genome and sequence analysis; astrophysics with cosmic rays analysis, antimatter and dark matter search, etc. This article describes developed portal as a top layer for computing facilities infrastructure for High Energy Physics and other compute-intensive science applications. The article presents the results of using PanDA at NRC KI supercomputer/ Cloud as underlying technology for the portal. C1 [Aulov, V.; Drizhuk, D.; Klimentov, A.; Krasnopevtsev, D.; Mashinistov, R.; Novikov, A.; Poyda, A.; Ryabinkin, E.; Tertychnyy, I.; Teslyuk, A.] Natl Res Ctr Kurchatov Inst, Moscow, Russia. [De, K.; Oleynik, D.] Univ Texas Arlington, Arlington, TX 76019 USA. [Klimentov, A.] Brookhaven Natl Lab, Upton, NY 11973 USA. [Oleynik, D.] Joint Inst Nucl Res, Dubna, Russia. [Krasnopevtsev, D.] Natl Res Nucl Univ MEPhI, Moscow, Russia. RP Aulov, V (reprint author), Natl Res Ctr Kurchatov Inst, Moscow, Russia. EM VasiliyAulov@gmail.com; kaushik@uta.edu; d.drizhuk@gmail.com; alexei.klimentov@cern.ch; Dimitriy.Krasnopevtsev@cern.ch; Ruslan.Mashinistov@cern.ch; novikov@wdcb.ru; Danila.Oleynik@cern.ch; Poyda_AA@nrcki.ru; rea@grid.kiae.ru; ivantertychnyi@gmail.com; anthony.teslyuk@grid.kiae.ru RI Mashinistov, Ruslan/M-8356-2015 OI Mashinistov, Ruslan/0000-0001-7925-4676 NR 13 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA SARA BURGERHARTSTRAAT 25, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1877-0509 J9 PROCEDIA COMPUT SCI PY 2015 VL 66 BP 564 EP 573 DI 10.1016/j.procs.2015.11.064 PG 10 WC Computer Science, Theory & Methods; Engineering, Electrical & Electronic SC Computer Science; Engineering GA BE6AW UT WOS:000373782500063 ER PT S AU Borodin, M De, K Navarro, JG Golubkov, D Klimentov, A Maeno, T South, D Vaniachine, A AF Borodin, Mikhail De, Kaushik Garcia Navarro, Jose Golubkov, Dmitry Klimentov, Alexei Maeno, Tadashi South, David Vaniachine, Alexandre CA ATLAS Collaboration BE Sloot, P Boukhanovsky, A Athanassoulis, G Klimentov, A TI Big Data Processing in the ATLAS Experiment: Use Cases and Experience SO 4TH INTERNATIONAL YOUNG SCIENTIST CONFERENCE ON COMPUTATIONAL SCIENCE SE Procedia Computer Science LA English DT Proceedings Paper CT 4th International Young Scientists Conference on Computational Science (YSC) CY JUN 25-JUL 03, 2015 CL Athens, GREECE DE Big Data; Grid-based Simulation and Computing; Parallel and Distributed Computing; Large Scale Scientific Instruments AB The physics goals of the next Large Hadron Collider run include high precision tests of the Standard Model and searches for new physics. These goals require detailed comparison of data with computational models simulating the expected data behavior. To highlight the role which modeling and simulation plays in future scientific discovery, we report on use cases and experience with a unified system built to process both real and simulated data of growing volume and variety. C1 [Borodin, Mikhail; Golubkov, Dmitry; Klimentov, Alexei] IV Kurchatov Atom Energy Inst, Big Data Lab, Natl Res Ctr, Moscow 123182, Russia. [Borodin, Mikhail] Natl Res Nucl Univ MEPhI, Moscow, Russia. [De, Kaushik] Univ Texas Arlington, Arlington, TX USA. [Garcia Navarro, Jose] Univ Valencia, Inst Fis Corpuscular, E-46003 Valencia, Spain. [Golubkov, Dmitry] Inst High Energy Phys, Protvino, Russia. [Klimentov, Alexei; Maeno, Tadashi] Brookhaven Natl Lab, Upton, NY 11973 USA. [South, David] DESY, Hamburg, Germany. [Vaniachine, Alexandre] Argonne Natl Lab, Argonne, IL 60439 USA. RP Borodin, M (reprint author), IV Kurchatov Atom Energy Inst, Big Data Lab, Natl Res Ctr, Moscow 123182, Russia. EM mikhail.borodin@cern.ch; kaushik@uta.edu; jose.enrique.garcia@cern.ch; dmitry.v.golubkov@cern.ch; aak@bnl.gov; maeno@bnl.gov; southd@mail.desy.de; vaniachine@anl.gov NR 12 TC 0 Z9 0 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA SARA BURGERHARTSTRAAT 25, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1877-0509 J9 PROCEDIA COMPUT SCI PY 2015 VL 66 BP 609 EP 618 DI 10.1016/j.procs.2015.11.069 PG 10 WC Computer Science, Theory & Methods; Engineering, Electrical & Electronic SC Computer Science; Engineering GA BE6AW UT WOS:000373782500068 ER PT S AU Fekete, SP Huang, K Mitchell, JSB Parekh, O Phillips, CA AF Fekete, Sandor P. Huang, Kan Mitchell, Joseph S. B. Parekh, Ojas Phillips, Cynthia A. BE Sanita, L Skutella, M TI Geometric Hitting Set for Segments of Few Orientations SO APPROXIMATION AND ONLINE ALGORITHMS, WAOA 2015 SE Lecture Notes in Computer Science LA English DT Proceedings Paper CT 13th International Workshop on Approximation and Online Algorithms (WAOA) CY SEP 17-18, 2015 CL Patras, GREECE ID APPROXIMATION ALGORITHMS; STABBING PROBLEMS; EPSILON-NETS; LOWER BOUNDS; APPROXIMABILITY; LINES; COVER; SIZE AB We study several natural instances of the geometric hitting set problem for input consisting of sets of line segments (and rays, lines) having a small number of distinct slopes. These problems model path monitoring (e.g., on road networks) using the fewest sensors (the "hitting points"). We give approximation algorithms for cases including (i) lines of 3 slopes in the plane, (ii) vertical lines and horizontal segments, (iii) pairs of horizontal/vertical segments. We give hardness and hardness of approximation results for these problems. We prove that the hitting set problem for vertical lines and horizontal rays is polynomially solvable. C1 [Fekete, Sandor P.] TU Braunschweig, Braunschweig, Germany. [Huang, Kan; Mitchell, Joseph S. B.] SUNY Stony Brook, Stony Brook, NY 11794 USA. [Parekh, Ojas; Phillips, Cynthia A.] Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. RP Phillips, CA (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. EM s.fekete@tu-bs.de; khuang@ams.sunysb.edu; jsbm@ams.sunysb.edu; odparek@sandia.gov; caphill@sandia.gov NR 34 TC 1 Z9 1 U1 0 U2 0 PU SPRINGER INT PUBLISHING AG PI CHAM PA GEWERBESTRASSE 11, CHAM, CH-6330, SWITZERLAND SN 0302-9743 BN 978-3-319-28684-6; 978-3-319-28683-9 J9 LECT NOTES COMPUT SC PY 2015 VL 9499 BP 145 EP 157 DI 10.1007/978-3-319-28684-6_13 PG 13 WC Computer Science, Theory & Methods; Engineering, Electrical & Electronic SC Computer Science; Engineering GA BE6FT UT WOS:000374051900013 ER PT S AU Rizzo, DB Blackburn, MR AF Rizzo, Davinia B. Blackburn, Mark R. BE Dagli, CH TI Use of Bayesian Networks for Qualification Planning: A Predictive Analysis Framework for a Technically Complex Systems Engineering Problem SO COMPLEX ADAPTIVE SYSTEMS, 2015 SE Procedia Computer Science LA English DT Proceedings Paper CT Conference on Engineering Cyber Physical Systems - Machine Learning, Data Analytics and Smart Systems Architecting CY NOV 02-04, 2015 CL San Jose, CA SP Missouri Univ Sci & Technol DE Bayesian network; qualification; vibration; systems engineering; 6DOF; multi-axis; decision model ID VALIDATION; MODEL; METRICS; SAFETY AB This paper discusses the viability of using Bayesian Network (BN) models to support qualification planning in order to predict the suitability of Six Degrees of Freedom (6DOF) vibration testing for qualification. Qualification includes environmental testing such as temperature, vibration, and shock to support a stochastic argument about the suitability of a design. Qualification is becoming more complex and restricted yet available new technologies are not fully utilized. Technology has advanced to the state where 6DOF vibration shakers and control systems capable of high frequency tests are possible, but the problem using these systems is far more complex than traditional single degree of freedom (SDOF) tests. This challenges systems engineers as they strive to plan qualification in an environment where technical, environmental, and political constraints are coupled with the traditional cost, risk and schedule constraints. New technologies are also available for systems engineers to combine technical understanding with cost, risk and schedule factors to aid in decision making for complex problems such as qualification planning. BN models may provide the framework to aid Systems Engineers in planning qualification efforts with complex constraints. This paper discusses related work, the current approach and results of this research. (C) 2015 The Authors. Published by Elsevier B.V. C1 [Rizzo, Davinia B.] Sandia Natl Labs, POB 5800 M-S 0386, Albuquerque, NM 87123 USA. [Blackburn, Mark R.] Stevens Inst Technol, Hoboken, NJ 07030 USA. RP Rizzo, DB (reprint author), Sandia Natl Labs, POB 5800 M-S 0386, Albuquerque, NM 87123 USA. EM dbrizzo@sandia.gov NR 45 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA SARA BURGERHARTSTRAAT 25, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1877-0509 J9 PROCEDIA COMPUT SCI PY 2015 VL 61 BP 133 EP 140 DI 10.1016/j.procs.2015.09.173 PG 8 WC Computer Science, Information Systems; Computer Science, Theory & Methods SC Computer Science GA BE6BY UT WOS:000373845000019 ER PT S AU Perkins, C Muller, G AF Perkins, Casey Muller, George BE Dagli, CH TI Using Discrete Event Simulation to Model Attacker Interactions with Cyber and Physical Security Systems SO COMPLEX ADAPTIVE SYSTEMS, 2015 SE Procedia Computer Science LA English DT Proceedings Paper CT Conference on Engineering Cyber Physical Systems - Machine Learning, Data Analytics and Smart Systems Architecting CY NOV 02-04, 2015 CL San Jose, CA SP Missouri Univ Sci & Technol DE Cyber-physical systems; vulnerability assessment; discrete event simulation; risk analysis AB The number of connections between physical and cyber security systems is rapidly increasing due to centralized control from automated and remotely connected means. As the number of interfaces between systems continues to grow, the interactions and interdependencies between them cannot be ignored. Historically, physical and cyber vulnerability assessments have been performed independently. This independent evaluation omits important aspects of the integrated system, where the impacts resulting from malicious or opportunistic attacks are not easily known or understood. We describe a discrete event simulation model that uses information about integrated physical and cyber security systems, attacker characteristics and simple response rules to identify key safeguards that limit an attacker's likelihood of success. Key features of the proposed model include comprehensive data generation to support a variety of sophisticated analyses, and full parameterization of safeguard performance characteristics and attacker behaviours to evaluate a range of scenarios. We also describe the core data requirements and the network of networks that serves as the underlying simulation structure. (C) 2015 The Authors. Published by Elsevier B.V. C1 [Perkins, Casey; Muller, George] Pacific NW Natl Lab, Richland, WA 99352 USA. RP Perkins, C (reprint author), Pacific NW Natl Lab, Richland, WA 99352 USA. OI Muller, George/0000-0002-4662-2521 NR 12 TC 0 Z9 0 U1 2 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA SARA BURGERHARTSTRAAT 25, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1877-0509 J9 PROCEDIA COMPUT SCI PY 2015 VL 61 BP 221 EP 226 DI 10.1016/j.procs.2015.09.199 PG 6 WC Computer Science, Information Systems; Computer Science, Theory & Methods SC Computer Science GA BE6BY UT WOS:000373845000031 ER PT S AU Cox, JA James, CD Aimone, JB AF Cox, Jonathan A. James, Conrad D. Aimone, James B. BE Dagli, CH TI A Signal Processing Approach for Cyber Data Classification with Deep Neural Networks SO COMPLEX ADAPTIVE SYSTEMS, 2015 SE Procedia Computer Science LA English DT Proceedings Paper CT Conference on Engineering Cyber Physical Systems - Machine Learning, Data Analytics and Smart Systems Architecting CY NOV 02-04, 2015 CL San Jose, CA SP Missouri Univ Sci & Technol DE Neural networks; Classification; Cyber security; Signal processing; Deep learning AB Recent cyber security events have demonstrated the need for algorithms that adapt to the rapidly evolving threat landscape of complex network systems. In particular, human analysts often fail to identify data exfiltration when it is encrypted or disguised as innocuous data. Signature-based approaches for identifying data types are easily fooled and analysts can only investigate a small fraction of network events. However, neural networks can learn to identify subtle patterns in a suitably chosen input space. To this end, we have developed a signal processing approach for classifying data files which readily adapts to new data formats. We evaluate the performance for three input spaces consisting of the power spectral density, byte probability distribution and sliding-window entropy of the byte sequence in a file. By combining all three, we trained a deep neural network to discriminate amongst nine common data types found on the Internet with 97.4% accuracy. (C) 2015 The Authors. Published by Elsevier B.V. C1 [Cox, Jonathan A.; James, Conrad D.; Aimone, James B.] Sandia Natl Labs, 1515 Eubank Blvd SE, Albuquerque, NM 87123 USA. RP Cox, JA (reprint author), Sandia Natl Labs, 1515 Eubank Blvd SE, Albuquerque, NM 87123 USA. EM joncox@alum.mit.edu RI Aimone, James/H-4694-2016 OI Aimone, James/0000-0002-7361-253X NR 12 TC 1 Z9 1 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA SARA BURGERHARTSTRAAT 25, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1877-0509 J9 PROCEDIA COMPUT SCI PY 2015 VL 61 BP 349 EP 354 DI 10.1016/j.procs.2015.09.156 PG 6 WC Computer Science, Information Systems; Computer Science, Theory & Methods SC Computer Science GA BE6BY UT WOS:000373845000050 ER PT S AU Thimmisetty, C Khodabakhshnejad, A Jabbari, N Aminzadeh, F Ghanem, R Rose, K Bauer, J Disenhof, C AF Thimmisetty, Charanraj Khodabakhshnejad, Arman Jabbari, Nima Aminzadeh, Fred Ghanem, Roger Rose, Kelly Bauer, Jennifer Disenhof, Corinne BE Ravela, S Sandu, A TI Multiscale Stochastic Representation in High-Dimensional Data Using Gaussian Processes with Implicit Diffusion Metrics SO DYNAMIC DATA-DRIVEN ENVIRONMENTAL SYSTEMS SCIENCE, DYDESS 2014 SE Lecture Notes in Computer Science LA English DT Proceedings Paper CT 1st International Conference on Dynamic Data-Driven Environmental Systems Science (DyDESS) CY NOV 05-07, 2014 CL Cambridge, MA SP Massachusetts Inst Technol, Dept Earth Atmospher & Planetary Sci AB We develop a stochastic representation of a scalar function defined on a high-dimensional space conditional on marginal statistics of the function at a finite set of localities and a high-dimensional correlation structure. The representation leverages a particular structure of the functional dependence that exhibits scale separation. In the process, we construct a polynomial chaos representation for the scalar quantity of interest (QoI) whose coefficients are themselves random. The intrinsic randomness of the polynomial chaos expansion (PCE) reflects local uncertainty and captures dependence on a subset (say S-1) of the parameters, while randomness in the PCE coefficients captures a global structure of the uncertainty and dependence on the remaining parameters (say S-2) in the high-dimensional space (let S = S-1 boolean OR S-2). This construction is demonstrated by predicting wellbore signatures in the Gulf of Mexico (GoM) where 100 tabulated data values are available at several thousand wellbore locations throughout the GoM. Reservoir simulators describing the physics of multiphase flow in porous media are used to calculate the PCE representations at the sites where data is available. In this context, random parameters describing the subsurface define the parameter set S-1. A Gaussian process model is then developed for each coefficient in these representations, construed as a function on S-2 over which an intrinsic diffusion metric is defined. C1 [Thimmisetty, Charanraj; Khodabakhshnejad, Arman; Jabbari, Nima; Aminzadeh, Fred; Ghanem, Roger] Univ So Calif, Los Angeles, CA USA. [Rose, Kelly; Bauer, Jennifer; Disenhof, Corinne] Natl Energy Technol Lab, Dept Energy, Albany, OR USA. [Disenhof, Corinne] Natl Energy Technol Lab, URS Corp, Albany, OR USA. RP Ghanem, R (reprint author), Univ So Calif, Los Angeles, CA USA. EM ghanem@usc.edu RI Ghanem, Roger/B-8570-2008 OI Ghanem, Roger/0000-0002-1890-920X NR 14 TC 0 Z9 0 U1 0 U2 1 PU SPRINGER INT PUBLISHING AG PI CHAM PA GEWERBESTRASSE 11, CHAM, CH-6330, SWITZERLAND SN 0302-9743 BN 978-3-319-25138-7; 978-3-319-25137-0 J9 LECT NOTES COMPUT SC PY 2015 VL 8964 BP 157 EP 166 DI 10.1007/978-3-319-25138-7_15 PG 10 WC Computer Science, Artificial Intelligence; Computer Science, Interdisciplinary Applications; Computer Science, Software Engineering; Computer Science, Theory & Methods; Robotics SC Computer Science; Robotics GA BE6BS UT WOS:000373824200015 ER PT S AU Godinez, HC Lawrence, E Higdon, D Ridley, A Koller, J Klimenko, A AF Godinez, Humberto C. Lawrence, Earl Higdon, David Ridley, Aaron Koller, Josef Klimenko, Alexei BE Ravela, S Sandu, A TI Specification of the Ionosphere-Thermosphere Using the Ensemble Kalman Filter SO DYNAMIC DATA-DRIVEN ENVIRONMENTAL SYSTEMS SCIENCE, DYDESS 2014 SE Lecture Notes in Computer Science LA English DT Proceedings Paper CT 1st International Conference on Dynamic Data-Driven Environmental Systems Science (DyDESS) CY NOV 05-07, 2014 CL Cambridge, MA SP Massachusetts Inst Technol, Dept Earth Atmospher & Planetary Sci ID GENERAL-CIRCULATION MODEL; DATA ASSIMILATION; ATMOSPHERE; DENSITY AB The Ionosphere-Thermosphere environment undergoes constant and sometimes dramatic changes due to solar and geomagnetic activity. Furthermore, given that this environment has a significant effect on space infrastructure, such as satellites, it is important to understand the potential changes caused by space weather events. This work presents the implementation of the ensemble Kalman filter assimilation technique to improve the nowcast and forecast of the thermosphere environment. Specifically, the assimilation tries to adjust F10.7, a solar radio flux parameter at 10.7 cm wavelength that acts as a proxy for solar activity. The results show that during high solar activity, the measured F10.7 index is able to account for the variability in the ionospherethermosphere, hence the correction provided by the assimilation is small. On the other hand, during low solar activity, F10.7 is unable to account for variability in the ionosphere-thermosphere, and the correction provided by the assimilation drastically improves the nowcast/forecast. C1 [Godinez, Humberto C.; Lawrence, Earl; Higdon, David; Koller, Josef; Klimenko, Alexei] Los Alamos Natl Lab, Appl Math & Plasma Phys, POB 1663, Los Alamos, NM 87544 USA. [Ridley, Aaron] Univ Michigan, Ann Arbor, MI 48109 USA. RP Godinez, HC (reprint author), Los Alamos Natl Lab, Appl Math & Plasma Phys, POB 1663, Los Alamos, NM 87544 USA. EM hgodinez@lanl.gov RI Ridley, Aaron/F-3943-2011; OI Ridley, Aaron/0000-0001-6933-8534; Klimenko, Alexei/0000-0003-4255-9374 NR 22 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER INT PUBLISHING AG PI CHAM PA GEWERBESTRASSE 11, CHAM, CH-6330, SWITZERLAND SN 0302-9743 BN 978-3-319-25138-7; 978-3-319-25137-0 J9 LECT NOTES COMPUT SC PY 2015 VL 8964 BP 274 EP 283 DI 10.1007/978-3-319-25138-7_25 PG 10 WC Computer Science, Artificial Intelligence; Computer Science, Interdisciplinary Applications; Computer Science, Software Engineering; Computer Science, Theory & Methods; Robotics SC Computer Science; Robotics GA BE6BS UT WOS:000373824200025 ER PT S AU Cappellini, A Cattaneo, A Manzoni, S Scaccabarozzi, M Vanali, M AF Cappellini, Anna Cattaneo, Alessandro Manzoni, Stefano Scaccabarozzi, Matteo Vanali, Marcello BE Caicedo, J Pakzad, S TI Effects of People Occupancy on the Modal Properties of a Stadium Grandstand SO DYNAMICS OF CIVIL STRUCTURES, VOL 2 SE Conference Proceedings of the Society for Experimental Mechanics Series LA English DT Proceedings Paper CT 33rd Conference and Exposition on Balancing Simulation and Testing (IMAC) CY FEB 02-05, 2015 CL Orlando, FL SP Soc Expt Mech DE Human structure interaction; Vibrations; Modal properties; Modal analysis; Damping ID HUMAN-BODY; APPARENT MASS AB It is well known that of people standing or sitting on a structure can change the dynamic behavior of the structure itself. Particularly, when a significant number of people are occupying a structure, high variations of non-dimensional damping ratios and natural frequencies are often experienced. The extent of these changes depends not only on the number of persons, but also on the properties of the empty structure and on people position and postures. This work analyses the effects of the presence of people on a grandstand of the San Siro stadium during some football matches and concerts. These effects are analyzed in terms of changes in modal parameters and amplitudes of vibrations. The impact of the number of people present on the structure on its dynamic behavior is also analyzed. The first results of an analytical approach, based on a FE model of the stand and a lumped parameter model of the people, to foresee the effect of people presence on stadia grandstands, is proposed in the end of the paper. The obtained results show that if an accurate model of the structure and detailed description of the stand occupancy are available the predicted results are in good agreement with the experimental evidence. C1 [Cappellini, Anna; Manzoni, Stefano; Scaccabarozzi, Matteo] Politecn Milan, Dept Mech Engn, I-20156 Milan, Italy. [Cattaneo, Alessandro] Los Alamos Natl Labs, Los Alamos, NM USA. [Vanali, Marcello] Univ Parma, Dept Ind Engn, Parco Area Sci 181-A, I-43124 Parma, Italy. RP Vanali, M (reprint author), Univ Parma, Dept Ind Engn, Parco Area Sci 181-A, I-43124 Parma, Italy. EM marcello.vanali@unipr.it OI Manzoni, Stefano/0000-0002-9240-5472 NR 18 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER PI NEW YORK PA 233 SPRING STREET, NEW YORK, NY 10013, UNITED STATES SN 2191-5644 BN 978-3-319-15248-6; 978-3-319-15247-9 J9 C PROC SOC EXP MECH PY 2015 BP 289 EP 298 DI 10.1007/978-3-319-15248-6_31 PG 10 WC Construction & Building Technology; Engineering, Mechanical SC Construction & Building Technology; Engineering GA BE6GN UT WOS:000374105200031 ER PT S AU Chien, A Balaji, P Beckman, P Dun, N Fang, A Fujita, H Iskra, K Rubenstein, Z Zheng, Z Schreiber, R Hammond, J Dinan, J Laguna, I Richards, D Dubey, A van Straalen, B Hoemmen, M Heroux, M Teranishi, K Siegel, A AF Chien, A. Balaji, P. Beckman, P. Dun, N. Fang, A. Fujita, H. Iskra, K. Rubenstein, Z. Zheng, Z. Schreiber, R. Hammond, J. Dinan, J. Laguna, I. Richards, D. Dubey, A. van Straalen, B. Hoemmen, M. Heroux, M. Teranishi, K. Siegel, A. BE Koziel, S Leifsson, L Lees, M Krzhizhanovskaya, VV Dongarra, J Sloot, PMA TI Versioned Distributed Arrays for Resilience in Scientific Applications: Global View Resilience SO INTERNATIONAL CONFERENCE ON COMPUTATIONAL SCIENCE, ICCS 2015 COMPUTATIONAL SCIENCE AT THE GATES OF NATURE SE Procedia Computer Science LA English DT Proceedings Paper CT 15th Annual International Conference on Computational Science (ICCS) CY JUN 01-03, 2015 CL Reykjavik Univ, Reykjavik, ICELAND SP Elsevier, Univ Amsterdam, NTU Singapore, Univ Tennessee HO Reykjavik Univ DE Resilience; fault tolerance; exascale; scalable computing; application-based fault tolerance AB Exascale studies project reliability challenges for future high-performance computing (HPC) systems. We propose the Global View Resilience (GVR) system, a library that enables applications to add resilience in a portable, application-controlled fashion using versioned distributed arrays. We describe GVR's interfaces to distributed arrays, versioning, and cross-layer error recovery. Using several large applications (OpenMC, the preconditioned conjugate gradient solver PCG, ddcMD, and Chombo), we evaluate the programmer effort to add resilience. The required changes are small (<2% LOC), localized, and machine-independent, requiring no software architecture changes. We also measure the overhead of adding GVR versioning and show that generally overheads <2% are achieved. We conclude that GVR's interfaces and implementation are flexible and portable and create a gentle-slope path to tolerate growing error rates in future systems. C1 [Chien, A.; Dun, N.; Fang, A.; Fujita, H.; Rubenstein, Z.] Univ Chicago, Chicago, IL 60637 USA. [Chien, A.; Balaji, P.; Beckman, P.; Dun, N.; Fujita, H.; Iskra, K.; Siegel, A.] Argonne Natl Lab, Argonne, IL 60439 USA. [Laguna, I.; Richards, D.] Lawrence Livermore Natl Lab HP, Livermore, CA USA. [Zheng, Z.; Schreiber, R.] Intel Corp, Santa Clara, CA 95051 USA. [Hammond, J.; Dinan, J.] Lawrence Berkeley Natl Lab, Livermore, CA USA. [Dubey, A.; van Straalen, B.] Sandia Natl Labs, Livermore, CA 94550 USA. RP Chien, A (reprint author), Univ Chicago, Chicago, IL 60637 USA. NR 47 TC 2 Z9 2 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA SARA BURGERHARTSTRAAT 25, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1877-0509 J9 PROCEDIA COMPUT SCI PY 2015 VL 51 BP 29 EP 38 DI 10.1016/j.procs.2015.05.187 PG 10 WC Computer Science, Interdisciplinary Applications; Computer Science, Theory & Methods SC Computer Science GA BE6DP UT WOS:000373939100003 ER PT S AU Kabir, K Haidar, A Tomov, S Dongarra, J AF Kabir, Khairul Haidar, Azzam Tomov, Stanimire Dongarra, Jack BE Koziel, S Leifsson, L Lees, M Krzhizhanovskaya, VV Dongarra, J Sloot, PMA TI Performance Analysis and Optimisation of Two-Sided Factorization Algorithms for Heterogeneous Platform SO INTERNATIONAL CONFERENCE ON COMPUTATIONAL SCIENCE, ICCS 2015 COMPUTATIONAL SCIENCE AT THE GATES OF NATURE SE Procedia Computer Science LA English DT Proceedings Paper CT 15th Annual International Conference on Computational Science (ICCS) CY JUN 01-03, 2015 CL Reykjavik Univ, Reykjavik, ICELAND SP Elsevier, Univ Amsterdam, NTU Singapore, Univ Tennessee HO Reykjavik Univ DE Eigensolver; multicore; Xeon Phi; task-based programming ID HESSENBERG FORM; GENERAL MATRIX; REDUCTION; EIGENVALUE; COMPUTATIONS AB Many applications, ranging from big data analytics to nanostructure designs, require the solution of large dense singular value decomposition (SVD) or eigenvalue problems. A first step in the solution methodology for these problems is the reduction of the matrix at hand to condensed form by two-sided orthogonal transformations. This step is standardly used to significantly accelerate the solution process. We present a performance analysis of the main two-sided factorizations used in these reductions: the bidiagonalization, tridiagonalization, and the upper Hessenberg factorizations on heterogeneous systems of multicore CPUs and Xeon Phi coprocessors. We derive a performance model and use it to guide the analysis and to evaluate performance. We develop optimized implementations for these methods that get up to 80% of the optimal performance bounds. Finally, we describe the heterogeneous multicore and coprocessor development considerations and the techniques that enable us to achieve these high-performance results. The work here presents the first highly optimized implementation of these main factorizations for Xeon Phi coprocessors. Compared to the LAPACK versions optmized by Intel for Xeon Phi (in MKL), we achieve up to 50% speedup. C1 [Kabir, Khairul; Haidar, Azzam; Tomov, Stanimire; Dongarra, Jack] Univ Tennessee, Knoxville, TN USA. [Dongarra, Jack] Oak Ridge Natl Lab, Oak Ridge, TN USA. [Dongarra, Jack] Univ Manchester, Manchester, Lancs, England. RP Kabir, K (reprint author), Univ Tennessee, Knoxville, TN USA. EM kkabir@eecs.utk.edu; haidar@eecs.utk.edu; tomov@eecs.utk.edu; dongarra@eecs.utk.edu NR 23 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA SARA BURGERHARTSTRAAT 25, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1877-0509 J9 PROCEDIA COMPUT SCI PY 2015 VL 51 BP 180 EP 190 DI 10.1016/j.procs.2015.05.222 PG 11 WC Computer Science, Interdisciplinary Applications; Computer Science, Theory & Methods SC Computer Science GA BE6DP UT WOS:000373939100018 ER PT S AU Tripathi, A Leyffer, S Munson, T Wild, SM AF Tripathi, Ashish Leyffer, Sven Munson, Todd Wild, Stefan M. BE Koziel, S Leifsson, L Lees, M Krzhizhanovskaya, VV Dongarra, J Sloot, PMA TI Visualizing and Improving the Robustness of Phase Retrieval Algorithms SO INTERNATIONAL CONFERENCE ON COMPUTATIONAL SCIENCE, ICCS 2015 COMPUTATIONAL SCIENCE AT THE GATES OF NATURE SE Procedia Computer Science LA English DT Proceedings Paper CT 15th Annual International Conference on Computational Science (ICCS) CY JUN 01-03, 2015 CL Reykjavik Univ, Reykjavik, ICELAND SP Elsevier, Univ Amsterdam, NTU Singapore, Univ Tennessee HO Reykjavik Univ DE Phase retrieval algorithms; inverse problems; nonlinear complex-valued optimization ID OPTIMIZATION AB Coherent x-ray diffractive imaging is a novel imaging technique that utilizes phase retrieval and nonlinear optimization methods to image matter at nanometer scales. We explore how the convergence properties of a popular phase retrieval algorithm, Fienup's HIO, behave by introducing a reduced dimensionality problem allowing us to visualize and quantify convergence to local minima and the globally optimal solution. We then introduce generalizations of HIO that improve upon the original algorithm's ability to converge to the globally optimal solution. C1 [Tripathi, Ashish; Leyffer, Sven; Munson, Todd; Wild, Stefan M.] Argonne Natl Lab, Div Math & Comp Sci, 9700 S Cass Ave, Argonne, IL 60439 USA. RP Tripathi, A (reprint author), Argonne Natl Lab, Div Math & Comp Sci, 9700 S Cass Ave, Argonne, IL 60439 USA. EM atripath@anl.gov; leyffer@anl.gov; tmunson@anl.gov; wild@anl.gov RI Wild, Stefan/P-4907-2016 OI Wild, Stefan/0000-0002-6099-2772 NR 11 TC 2 Z9 2 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA SARA BURGERHARTSTRAAT 25, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1877-0509 J9 PROCEDIA COMPUT SCI PY 2015 VL 51 BP 815 EP 824 DI 10.1016/j.procs.2015.05.205 PG 10 WC Computer Science, Interdisciplinary Applications; Computer Science, Theory & Methods SC Computer Science GA BE6DP UT WOS:000373939100083 ER PT S AU Scheibe, TD Yang, XF Chen, XY Hammond, G AF Scheibe, Timothy D. Yang, Xiaofan Chen, Xingyuan Hammond, Glenn BE Koziel, S Leifsson, L Lees, M Krzhizhanovskaya, VV Dongarra, J Sloot, PMA TI A Hybrid Multiscale Framework for Subsurface Flow and Transport Simulations SO INTERNATIONAL CONFERENCE ON COMPUTATIONAL SCIENCE, ICCS 2015 COMPUTATIONAL SCIENCE AT THE GATES OF NATURE SE Procedia Computer Science LA English DT Proceedings Paper CT 15th Annual International Conference on Computational Science (ICCS) CY JUN 01-03, 2015 CL Reykjavik Univ, Reykjavik, ICELAND SP Elsevier, Univ Amsterdam, NTU Singapore, Univ Tennessee HO Reykjavik Univ DE hybrid multiscale simulation; pore scale; biogeochemistry; reactive transport; high-performance computing AB Extensive research is aimed at improving predictive ability of biogeochemical earth and environmental system simulators, with applications ranging from contaminant transport and remediation to impacts of carbon and nitrogen cycling on local ecosystems and climate. Most process-based numerical models are designed for a single characteristic length and time scale. For application-relevant scales, it is necessary to introduce approximations and empirical parameterizations to describe complex systems because of limitations on process understanding, system characterization and computation. Using emerging understanding of biological and environmental processes at fundamental scales to advance predictions of the larger system behavior requires the development of multiscale simulators, and there is strong interest in coupling microscale and macroscale models together in a hybrid multiscale simulation. A limited number of hybrid multiscale simulations have been developed for biogeochemical systems, mostly using application-specific approaches for model coupling. We are developing a generalized approach to hierarchical model coupling designed for high-performance computational systems, based on the Swift computing workflow framework. In this presentation we will describe the generalized approach and provide two use cases: 1) simulation of a mixing-controlled biogeochemical reaction coupling pore-and continuum-scale models, and 2) simulation of biogeochemical impacts of groundwater - river water interactions coupling fine-and coarse-grid model representations. This generalized framework can be customized for use with any pair of linked models (microscale and macroscale) with minimal intrusiveness to the at-scale simulators. It combines a set of python scripts with the Swift workflow environment to execute a complex multiscale simulation utilizing an approach similar to the well-known Heterogeneous Multiscale Method. User customization is facilitated through user-provided input and output file templates and processing function scripts, and execution within a high-performance computing environment is handled by Swift, such that minimal to no user modification of at-scale codes is required. C1 [Scheibe, Timothy D.; Yang, Xiaofan; Chen, Xingyuan] Pacific NW Natl Lab, POB 999,MS K9-36, Richland, WA 99352 USA. [Hammond, Glenn] Sandia Natl Labs, Albuquerque, NM USA. RP Scheibe, TD (reprint author), Pacific NW Natl Lab, POB 999,MS K9-36, Richland, WA 99352 USA. EM tim.scheibe@pnnl.gov RI Scheibe, Timothy/A-8788-2008 OI Scheibe, Timothy/0000-0002-8864-5772 NR 23 TC 1 Z9 1 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA SARA BURGERHARTSTRAAT 25, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1877-0509 J9 PROCEDIA COMPUT SCI PY 2015 VL 51 BP 1098 EP 1107 DI 10.1016/j.procs.2015.05.276 PG 10 WC Computer Science, Interdisciplinary Applications; Computer Science, Theory & Methods SC Computer Science GA BE6DP UT WOS:000373939100112 ER PT S AU Vencels, J Delzanno, GL Johnson, A Peng, IB Laure, E Markidis, S AF Vencels, Juris Delzanno, Gian Luca Johnson, Alec Peng, Ivy Bo Laure, Erwin Markidis, Stefano BE Koziel, S Leifsson, L Lees, M Krzhizhanovskaya, VV Dongarra, J Sloot, PMA TI Spectral Solver for Multi-Scale Plasma Physics Simulations with Dynamically Adaptive Number of Moments SO INTERNATIONAL CONFERENCE ON COMPUTATIONAL SCIENCE, ICCS 2015 COMPUTATIONAL SCIENCE AT THE GATES OF NATURE SE Procedia Computer Science LA English DT Proceedings Paper CT 15th Annual International Conference on Computational Science (ICCS) CY JUN 01-03, 2015 CL Reykjavik Univ, Reykjavik, ICELAND SP Elsevier, Univ Amsterdam, NTU Singapore, Univ Tennessee HO Reykjavik Univ DE Plasma Simulations; Spectral Methods; Fluid-Kinetic Coupling ID IN-CELL METHOD AB A spectral method for kinetic plasma simulations based on the expansion of the velocity distribution function in a variable number of Hermite polynomials is presented. The method is based on a set of non-linear equations that is solved to determine the coefficients of the Hermite expansion satisfying the Vlasov and Poisson equations. In this paper, we first show that this technique combines the fluid and kinetic approaches into one framework. Second, we present an adaptive strategy to increase and decrease the number of Hermite functions dynamically during the simulation. The technique is applied to the Landau damping and two-stream instability test problems. Performance results show 21% and 47% saving of total simulation time in the Landau and two-stream instability test cases, respectively. C1 [Vencels, Juris; Peng, Ivy Bo; Laure, Erwin; Markidis, Stefano] KTH Royal Inst Technol, HPCViz, Stockholm, Sweden. [Delzanno, Gian Luca] Los Alamos Natl Lab, Appl Math & Plasma Phys Grp T5, Los Alamos, NM 87545 USA. [Johnson, Alec] Katholieke Univ Leuven, CmPA, Dept Math, Louvain, Belgium. RP Vencels, J (reprint author), KTH Royal Inst Technol, HPCViz, Stockholm, Sweden. OI Delzanno, Gian Luca/0000-0002-7030-2683 NR 16 TC 5 Z9 5 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA SARA BURGERHARTSTRAAT 25, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1877-0509 J9 PROCEDIA COMPUT SCI PY 2015 VL 51 BP 1148 EP 1157 DI 10.1016/j.procs.2015.05.284 PG 10 WC Computer Science, Interdisciplinary Applications; Computer Science, Theory & Methods SC Computer Science GA BE6DP UT WOS:000373939100117 ER PT S AU Turner, J Allu, S Berrill, M Elwasif, W Kalnaus, S Kumar, A Lebrun-Grandie, D Pannala, S Simunovic, S AF Turner, John Allu, Srikanth Berrill, Mark Elwasif, Wael Kalnaus, Sergiy Kumar, Abhishek Lebrun-Grandie, Damien Pannala, Sreekanth Simunovic, Srdjan BE Koziel, S Leifsson, L Lees, M Krzhizhanovskaya, VV Dongarra, J Sloot, PMA TI Safer Batteries through Coupled Multiscale Modeling SO INTERNATIONAL CONFERENCE ON COMPUTATIONAL SCIENCE, ICCS 2015 COMPUTATIONAL SCIENCE AT THE GATES OF NATURE SE Procedia Computer Science LA English DT Proceedings Paper CT 15th Annual International Conference on Computational Science (ICCS) CY JUN 01-03, 2015 CL Reykjavik Univ, Reykjavik, ICELAND SP Elsevier, Univ Amsterdam, NTU Singapore, Univ Tennessee HO Reykjavik Univ DE battery safety; coupled physics; electrochemistry; energy storage; multiphysics; multiscale ID LI-ION CELLS; CAPACITY FADE; INSERTION CELL; FUEL-CELLS; SIMULATION; BEHAVIOR; DISCHARGE; MODULES; CHARGE AB Batteries are highly complex electrochemical systems, with performance and safety governed by coupled nonlinear electrochemical-electrical-thermal-mechanical processes over a range of spatiotemporal scales. We describe a new, open source computational environment for battery simulation known as VIBE - the Virtual Integrated Battery Environment. VIBE includes homogenized and pseudo-2D electrochemistry models such as those by Newman-Tiedemann-Gu (NTG) and Doyle-Fuller-Newman (DFN, a.k.a. DualFoil) as well as a new advanced capability known as AMPERES (Advanced MultiPhysics for Electrochemical and Renewable Energy Storage). AMPERES provides a 3D model for electrochemistry and full coupling with 3D electrical and thermal models on the same grid. VIBE/AMPERES has been used to create three-dimensional battery cell and pack models that explicitly simulate all the battery components (current collectors, electrodes, and separator). The models are used to predict battery performance under normal operations and to study thermal and mechanical response under adverse conditions. C1 [Turner, John; Allu, Srikanth; Berrill, Mark; Elwasif, Wael; Kalnaus, Sergiy; Kumar, Abhishek; Lebrun-Grandie, Damien; Pannala, Sreekanth; Simunovic, Srdjan] Oak Ridge Natl Lab, Oak Ridge, TN USA. RP Turner, J (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN USA. EM turnerja@ornl.gov OI Kalnaus, Sergiy/0000-0002-7465-3034; Berrill, Mark/0000-0002-4525-3939; Turner, John/0000-0003-2521-4091; allu, srikanth/0000-0003-2841-4398 NR 44 TC 1 Z9 1 U1 3 U2 9 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA SARA BURGERHARTSTRAAT 25, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1877-0509 J9 PROCEDIA COMPUT SCI PY 2015 VL 51 BP 1168 EP 1177 DI 10.1016/j.procs.2015.05.286 PG 10 WC Computer Science, Interdisciplinary Applications; Computer Science, Theory & Methods SC Computer Science GA BE6DP UT WOS:000373939100119 ER PT S AU Shishlo, A Cousineau, S Holmes, J Gorlov, T AF Shishlo, Andrei Cousineau, Sarah Holmes, Jeffrey Gorlov, Timofey BE Koziel, S Leifsson, L Lees, M Krzhizhanovskaya, VV Dongarra, J Sloot, PMA TI The Particle Accelerator Simulation Code PyORBIT SO INTERNATIONAL CONFERENCE ON COMPUTATIONAL SCIENCE, ICCS 2015 COMPUTATIONAL SCIENCE AT THE GATES OF NATURE SE Procedia Computer Science LA English DT Proceedings Paper CT 15th Annual International Conference on Computational Science (ICCS) CY JUN 01-03, 2015 CL Reykjavik Univ, Reykjavik, ICELAND SP Elsevier, Univ Amsterdam, NTU Singapore, Univ Tennessee HO Reykjavik Univ DE Open Source; Python; C plus; MPI; Accelerator Simulation; Particles-in-Cell; Space Charge; PyORBIT AB The particle accelerator simulation code PyORBIT is presented. The structure, implementation, history, parallel and simulation capabilities, and future development of the code are discussed. The PyORBIT code is a new implementation and extension of algorithms of the original ORBIT code that was developed for the Spallation Neutron Source accelerator at the Oak Ridge National Laboratory. The PyORBIT code has a two level structure. The upper level uses the Python programming language to control the flow of intensive calculations performed by the lower level code implemented in the C++ language. The parallel capabilities are based on MPI communications. The PyORBIT is an open source code accessible to the public through the Google Open Source Projects Hosting Service. C1 [Shishlo, Andrei; Cousineau, Sarah; Holmes, Jeffrey; Gorlov, Timofey] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Shishlo, A (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. EM shishlo@ornl.gov; scousine@ornl.gov; holmesja1@ornl.gov; gorlovtv@ornl.gov NR 7 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA SARA BURGERHARTSTRAAT 25, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1877-0509 J9 PROCEDIA COMPUT SCI PY 2015 VL 51 BP 1272 EP 1281 DI 10.1016/j.procs.2015.05.312 PG 10 WC Computer Science, Interdisciplinary Applications; Computer Science, Theory & Methods SC Computer Science GA BE6DP UT WOS:000373939100130 ER PT S AU Janjusic, T Kartsaklis, C AF Janjusic, Tomislav Kartsaklis, Christos BE Koziel, S Leifsson, L Lees, M Krzhizhanovskaya, VV Dongarra, J Sloot, PMA TI Glprof: A Gprof inspired, Callgraph-oriented Per-Object Disseminating Memory Access Multi-Cache Profiler SO INTERNATIONAL CONFERENCE ON COMPUTATIONAL SCIENCE, ICCS 2015 COMPUTATIONAL SCIENCE AT THE GATES OF NATURE SE Procedia Computer Science LA English DT Proceedings Paper CT 15th Annual International Conference on Computational Science (ICCS) CY JUN 01-03, 2015 CL Reykjavik Univ, Reykjavik, ICELAND SP Elsevier, Univ Amsterdam, NTU Singapore, Univ Tennessee HO Reykjavik Univ DE Application tracing; Benchmarking; Memory profiling; Data-structure analysis ID FRAMEWORK; SYSTEM AB Application analysis is facilitated through a number of program profiling tools. The tools vary in their complexity, ease of deployment, design, and profiling detail. Specifically, understanding, analyzing, and optimizing is of particular importance for scientific applications where minor changes in code paths and data-structure layout can have profound effects. Understanding how intricate data-structures are accessed and how a given memory system responds is a complex task. In this paper we describe a trace profiling tool, Glprof, specifically aimed to lessen the burden of the programmer to pin-point heavily involved data-structures during an application's run-time, and understand data-structure run-time usage. Moreover, we showcase the tool's modularity using additional cache simulation components. We elaborate on the tool's design, and features. Finally we demonstrate the application of our tool in the context of Spec benchmarks using the Glprof profiler and two concurrently running cache simulators, PPC440 and AMD Interlagos. C1 [Janjusic, Tomislav; Kartsaklis, Christos] Oak Ridge Natl Lab, Oak Ridge, TN USA. RP Janjusic, T (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN USA. EM janjusict@ornl.gov; kartsaklisc@ornl.gov NR 19 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA SARA BURGERHARTSTRAAT 25, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1877-0509 J9 PROCEDIA COMPUT SCI PY 2015 VL 51 BP 1363 EP 1372 DI 10.1016/j.procs.2015.05.324 PG 10 WC Computer Science, Interdisciplinary Applications; Computer Science, Theory & Methods SC Computer Science GA BE6DP UT WOS:000373939100139 ER PT S AU Norman, MR AF Norman, Matthew R. BE Koziel, S Leifsson, L Lees, M Krzhizhanovskaya, VV Dongarra, J Sloot, PMA TI Developing A Large Time Step, Robust, and Low Communication Multi-Moment PDE Integration Scheme for Exascale Applications SO INTERNATIONAL CONFERENCE ON COMPUTATIONAL SCIENCE, ICCS 2015 COMPUTATIONAL SCIENCE AT THE GATES OF NATURE SE Procedia Computer Science LA English DT Proceedings Paper CT 15th Annual International Conference on Computational Science (ICCS) CY JUN 01-03, 2015 CL Reykjavik Univ, Reykjavik, ICELAND SP Elsevier, Univ Amsterdam, NTU Singapore, Univ Tennessee HO Reykjavik Univ DE MCV; multi-moment; finite-volume; ADER; transport ID FINITE-VOLUME METHOD; CONSERVATION-LAWS; BASIC FORMULATION AB The Boundary Averaged Multi-moment Constrained finite-Volume (BA-MCV) method is derived, explained, and evaluated for 1-D transport to assess accuracy, maximum stable time step (MSTS), oscillations for discontinuous data, and parallel communication burden. The BA-MCV scheme is altered from the original MCV scheme to compute the updates of point wise cell boundary derivatives entirely locally. Then it is altered such that boundary moments are replaced with the interface upwind value. The scheme is stable at a maximum stable CFL (MSCFL) value of one no matter how high-order the scheme is, giving significantly larger time steps than Galerkin methods, for which the MSCFL decreases nearly quadratically with increasing order. The BA-MCV method is compared against a SE method at varying order, both using the ADER-DT time discretization. BA-MCV error for a sine wave was comparable to the same order of accuracy for a SE method. The resulting large time step, multi-moment, low communication scheme is of great interest for exascale architectures. C1 [Norman, Matthew R.] Oak Ridge Natl Lab, Oak Ridge, TN USA. RP Norman, MR (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN USA. EM normanmr@ornl.gov NR 12 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA SARA BURGERHARTSTRAAT 25, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1877-0509 J9 PROCEDIA COMPUT SCI PY 2015 VL 51 BP 1848 EP 1857 DI 10.1016/j.procs.2015.05.413 PG 10 WC Computer Science, Interdisciplinary Applications; Computer Science, Theory & Methods SC Computer Science GA BE6DP UT WOS:000373939100188 ER PT S AU Jonsson, EO Lehtola, S Jonsson, H AF Jonsson, Elvar Orn Lehtola, Susi Jonsson, Hannes BE Koziel, S Leifsson, L Lees, M Krzhizhanovskaya, VV Dongarra, J Sloot, PMA TI Towards An Optimal Gradient-Dependent Energy Functional of the PZ-SIC Form SO INTERNATIONAL CONFERENCE ON COMPUTATIONAL SCIENCE, ICCS 2015 COMPUTATIONAL SCIENCE AT THE GATES OF NATURE SE Procedia Computer Science LA English DT Proceedings Paper CT 15th Annual International Conference on Computational Science (ICCS) CY JUN 01-03, 2015 CL Reykjavik Univ, Reykjavik, ICELAND SP Elsevier, Univ Amsterdam, NTU Singapore, Univ Tennessee HO Reykjavik Univ DE density functional theory; self-interaction correction; exchange-correlation functional ID SELF-INTERACTION CORRECTION; DENSITY; MOLECULES; ORBITALS AB Results of Perdew-Zunger self-interaction corrected (PZ-SIC) density functional theory calculations of the atomization energy of 35 molecules are compared to those of high-level quantum chemistry calculations. While the PBE functional, which is commonly used in calculations of condensed matter, is known to predict on average too high atomization energy (overbinding of the molecules), the application of PZ-SIC gives a large overcorrection and leads to significant underestimation of the atomization energy. The exchange enhancement factor that is optimal for the generalized gradient approximation within the Kohn-Sham (KS) approach may not be optimal for the self-interaction corrected functional. The PBEsol functional, where the exchange enhancement factor was optimized for solids, gives poor results for molecules in KS but turns out to work better than PBE in PZ-SIC calculations. The exchange enhancement is weaker in PBEsol and the functional is closer to the local density approximation. Furthermore, the drop in the exchange enhancement factor for increasing reduced gradient in the PW91 functional gives more accurate results than the plateaued enhancement in the PBE functional. A step towards an optimal exchange enhancement factor for a gradient dependent functional of the PZ-SIC form is taken by constructing an exchange enhancement factor that mimics PBEsol for small values of the reduced gradient, and PW91 for large values. The average atomization energy is then in closer agreement with the high-level quantum chemistry calculations, but the variance is still large, the F-2 molecule being a notable outlier. C1 [Jonsson, Elvar Orn; Lehtola, Susi; Jonsson, Hannes] Aalto Univ, Dept Appl Phys, Espoo, Finland. [Lehtola, Susi] Lawrence Berkeley Natl Lab, Div Chem Sci, Berkeley, CA USA. [Jonsson, Hannes] Univ Iceland, Fac Phys Sci, Reykjavik, Iceland. RP Jonsson, EO (reprint author), Aalto Univ, Dept Appl Phys, Espoo, Finland. EM elvar.jonsson@aalto.fi; susi.lehtola@alumni.helsinki.fi; hj@hi.is RI Lehtola, Susi/H-1828-2013; Jonsson, Hannes/G-2267-2013 OI Lehtola, Susi/0000-0001-6296-8103; Jonsson, Hannes/0000-0001-8285-5421 NR 20 TC 4 Z9 4 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA SARA BURGERHARTSTRAAT 25, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1877-0509 J9 PROCEDIA COMPUT SCI PY 2015 VL 51 BP 1858 EP 1864 DI 10.1016/j.procs.2015.05.417 PG 7 WC Computer Science, Interdisciplinary Applications; Computer Science, Theory & Methods SC Computer Science GA BE6DP UT WOS:000373939100189 ER PT S AU Collins, WD Johansen, H Evans, KJ Woodward, CS Caldwell, PM AF Collins, W. D. Johansen, H. Evans, K. J. Woodward, C. S. Caldwell, P. M. BE Koziel, S Leifsson, L Lees, M Krzhizhanovskaya, VV Dongarra, J Sloot, PMA TI Progress in Fast, Accurate Multi-scale Climate Simulations SO INTERNATIONAL CONFERENCE ON COMPUTATIONAL SCIENCE, ICCS 2015 COMPUTATIONAL SCIENCE AT THE GATES OF NATURE SE Procedia Computer Science LA English DT Proceedings Paper CT 15th Annual International Conference on Computational Science (ICCS) CY JUN 01-03, 2015 CL Reykjavik Univ, Reykjavik, ICELAND SP Elsevier, Univ Amsterdam, NTU Singapore, Univ Tennessee HO Reykjavik Univ DE earth system models; multi-scale climate; time integration; many-core ID COMMUNITY-ATMOSPHERIC-MODEL; PRECIPITATION EXTREMES; TOGA COARE; RESOLUTION; CONVECTION; OCEAN; CHALLENGES; PROJECT; VERSION AB We present a survey of physical and computational techniques that have the potential to contribute to the next generation of high-fidelity, multi-scale climate simulations. Examples of the climate science problems that can be investigated with more depth with these computational improvements include the capture of remote forcings of localized hydrological extreme events, an accurate representation of cloud features over a range of spatial and temporal scales, and parallel, large ensembles of simulations to more effectively explore model sensitivities and uncertainties. Numerical techniques, such as adaptive mesh refinement, implicit time integration, and separate treatment of fast physical time scales are enabling improved accuracy and fidelity in simulation of dynamics and allowing more complete representations of climate features at the global scale. At the same time, partnerships with computer science teams have focused on taking advantage of evolving computer architectures such as many-core processors and GPUs. As a result, approaches which were previously considered prohibitively costly have become both more efficient and scalable. In combination, progress in these three critical areas is poised to transform climate modeling in the coming decades. These topics have been presented within a workshop titled, "Numerical and Computational Developments to Advance Multiscale Earth System Models (MSESM '15)," as part of the International Conference on Computational Sciences, Reykjavik, Iceland, June 1-3, 2015. C1 [Collins, W. D.; Johansen, H.] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. [Evans, K. J.] Oak Ridge Natl Lab, Oak Ridge, TN USA. [Woodward, C. S.; Caldwell, P. M.] Lawrence Livermore Natl Lab, Livermore, CA USA. RP Collins, WD (reprint author), Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. EM wdcollins@lbl.gov; hjohansen@lbl.gov; evanskj@ornl.gov; caldwell19@llnl.gov; woodward6@llnl.gov RI Woodward, Carol/M-4008-2014; Collins, William/J-3147-2014; OI Collins, William/0000-0002-4463-9848; Evans, Katherine/0000-0001-8174-6450 NR 62 TC 1 Z9 1 U1 1 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA SARA BURGERHARTSTRAAT 25, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1877-0509 J9 PROCEDIA COMPUT SCI PY 2015 VL 51 BP 2006 EP 2015 DI 10.1016/j.procs.2015.05.465 PG 10 WC Computer Science, Interdisciplinary Applications; Computer Science, Theory & Methods SC Computer Science GA BE6DP UT WOS:000373939100205 ER PT S AU Sarje, A Song, S Jacobsen, D Huck, K Hollingsworth, J Malony, A Williams, S Oliker, L AF Sarje, Abhinav Song, Sukhyun Jacobsen, Douglas Huck, Kevin Hollingsworth, Jeffrey Malony, Allen Williams, Samuel Oliker, Leonid BE Koziel, S Leifsson, L Lees, M Krzhizhanovskaya, VV Dongarra, J Sloot, PMA TI Parallel Performance Optimizations on Unstructured Mesh-Based Simulations SO INTERNATIONAL CONFERENCE ON COMPUTATIONAL SCIENCE, ICCS 2015 COMPUTATIONAL SCIENCE AT THE GATES OF NATURE SE Procedia Computer Science LA English DT Proceedings Paper CT 15th Annual International Conference on Computational Science (ICCS) CY JUN 01-03, 2015 CL Reykjavik Univ, Reykjavik, ICELAND SP Elsevier, Univ Amsterdam, NTU Singapore, Univ Tennessee HO Reykjavik Univ DE Unstructured Mesh; Ocean Modeling; Graph Partitioning; Performance Optimization AB This paper addresses two key parallelization challenges the unstructured mesh-based ocean modeling code, MPAS-Ocean, which uses a mesh based on Voronoi tessellations: (1) load imbalance across processes, and (2) unstructured data access patterns, that inhibit intra-and inter-node performance. Our work analyzes the load imbalance due to naive partitioning of the mesh, and develops methods to generate mesh partitioning with better load balance and reduced communication. Furthermore, we present methods that minimize both inter-and intra-node data movement and maximize data reuse. Our techniques include predictive ordering of data elements for higher cache efficiency, as well as communication reduction approaches. We present detailed performance data when running on thousands of cores using the Cray XC30 supercomputer and show that our optimization strategies can exceed the original performance by over 2x. Additionally, many of these solutions can be broadly applied to a wide variety of unstructured grid-based computations. C1 [Sarje, Abhinav; Williams, Samuel; Oliker, Leonid] Lawrence Berkeley Natl Lab, Berkeley, CA USA. [Song, Sukhyun; Hollingsworth, Jeffrey] Univ Maryland, College Pk, MD USA. [Jacobsen, Douglas] Los Alamos Natl Lab, Los Alamos, NM 87545 USA. [Huck, Kevin; Malony, Allen] Univ Oregon, Eugene, OR 97403 USA. RP Sarje, A (reprint author), Lawrence Berkeley Natl Lab, Berkeley, CA USA. EM asarje@lbl.gov; shsong@cs.umd.edu; douglasj@lanl.gov; khuck@cs.uoregon.edu; hollings@cs.umd.edu; malony@cs.uoregon.edu; swwilliams@lbl.gov; loliker@lbl.gov NR 20 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA SARA BURGERHARTSTRAAT 25, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1877-0509 J9 PROCEDIA COMPUT SCI PY 2015 VL 51 BP 2016 EP 2025 DI 10.1016/j.procs.2015.05.466 PG 10 WC Computer Science, Interdisciplinary Applications; Computer Science, Theory & Methods SC Computer Science GA BE6DP UT WOS:000373939100207 ER PT S AU Tezaur, IK Tuminaro, RS Perego, M Salinger, AG Price, SF AF Tezaur, Irina K. Tuminaro, Raymond S. Perego, Mauro Salinger, Andrew G. Price, Stephen F. BE Koziel, S Leifsson, L Lees, M Krzhizhanovskaya, VV Dongarra, J Sloot, PMA TI On the scalability of the Albany/FELIX first-order Stokes approximation ice sheet solver for large-scale simulations of the Greenland and Antarctic ice sheets SO INTERNATIONAL CONFERENCE ON COMPUTATIONAL SCIENCE, ICCS 2015 COMPUTATIONAL SCIENCE AT THE GATES OF NATURE SE Procedia Computer Science LA English DT Proceedings Paper CT 15th Annual International Conference on Computational Science (ICCS) CY JUN 01-03, 2015 CL Reykjavik Univ, Reykjavik, ICELAND SP Elsevier, Univ Amsterdam, NTU Singapore, Univ Tennessee HO Reykjavik Univ DE Ice sheet model; first-order Stokes approximation; finite element method; scalability; ILU preconditioner; algebraic multigrid (AMG) preconditioner; semi-coarsening; Greenland; Antarctica ID GLACIERS; VELOCITY; STRESS; MODELS; FLOW AB We examine the scalability of the recently developed Albany/FELIX finite-element based code for the first-order Stokes momentum balance equations for ice flow. We focus our analysis on the performance of two possible preconditioners for the iterative solution of the sparse linear systems that arise from the discretization of the governing equations: (1) a preconditioner based on the incomplete LU (ILU) factorization, and (2) a recently-developed algebraic multigrid (AMG) preconditioner, constructed using the idea of semi-coarsening. A strong scalability study on a realistic, high resolution Greenland ice sheet problem reveals that, for a given number of processor cores, the AMG preconditioner results in faster linear solve times but the ILU preconditioner exhibits better scalability. A weak scalability study is performed on a realistic, moderate resolution Antarctic ice sheet problem, a substantial fraction of which contains floating ice shelves, making it fundamentally different from the Greenland ice sheet problem. Here, we show that as the problem size increases, the performance of the ILU preconditioner deteriorates whereas the AMG preconditioner maintains scalability. This is because the linear systems are extremely ill-conditioned in the presence of floating ice shelves, and the ill-conditioning has a greater negative effect on the ILU preconditioner than on the AMG preconditioner. C1 [Tezaur, Irina K.] Sandia Natl Labs, Quantitat Modeling & Anal Dept, Livermore, CA USA. [Tuminaro, Raymond S.; Perego, Mauro; Salinger, Andrew G.] Sandia Natl Labs, Computat Math Dept, Albuquerque, NM 87185 USA. [Price, Stephen F.] Los Alamos Natl Lab, Fluid Dynam & Solid Mech Grp, Los Alamos, NM USA. RP Tezaur, IK (reprint author), Sandia Natl Labs, Quantitat Modeling & Anal Dept, Livermore, CA USA. EM ikalash@sandia.gov RI Price, Stephen /E-1568-2013 OI Price, Stephen /0000-0001-6878-2553 NR 18 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA SARA BURGERHARTSTRAAT 25, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1877-0509 J9 PROCEDIA COMPUT SCI PY 2015 VL 51 BP 2026 EP 2035 DI 10.1016/j.procs.2015.05.467 PG 10 WC Computer Science, Interdisciplinary Applications; Computer Science, Theory & Methods SC Computer Science GA BE6DP UT WOS:000373939100208 ER PT S AU Woodward, CS Gardner, DJ Evans, KJ AF Woodward, Carol S. Gardner, David J. Evans, Katherine J. BE Koziel, S Leifsson, L Lees, M Krzhizhanovskaya, VV Dongarra, J Sloot, PMA TI On the Use of Finite Difference Matrix-Vector Products in Newton-Krylov Solvers for Implicit Climate Dynamics with Spectral Elements SO INTERNATIONAL CONFERENCE ON COMPUTATIONAL SCIENCE, ICCS 2015 COMPUTATIONAL SCIENCE AT THE GATES OF NATURE SE Procedia Computer Science LA English DT Proceedings Paper CT 15th Annual International Conference on Computational Science (ICCS) CY JUN 01-03, 2015 CL Reykjavik Univ, Reykjavik, ICELAND SP Elsevier, Univ Amsterdam, NTU Singapore, Univ Tennessee HO Reykjavik Univ DE matrix-vector multiply; spectral element solvers; Newton's method ID SHALLOW-WATER EQUATIONS; SOLUTION FRAMEWORK; NAVIER-STOKES; APPROXIMATIONS; MODEL AB Efficient solutions of global climate models require effectively handling disparate length and time scales. Implicit solution approaches allow time integration of the physical system with a step size governed by accuracy of the processes of interest rather than by stability of the fastest time scales present. Implicit approaches, however, require the solution of nonlinear systems within each time step. Usually, a Newton's method is applied to solve these systems. Each iteration of the Newton's method, in turn, requires the solution of a linear model of the nonlinear system. This model employs the Jacobian of the problem-defining nonlinear residual, but this Jacobian can be costly to form. If a Krylov linear solver is used for the solution of the linear system, the action of the Jacobian matrix on a given vector is required. In the case of spectral element methods, the Jacobian is not calculated but only implemented through matrix-vector products. The matrix-vector multiply can also be approximated by a finite difference approximation which may introduce inaccuracy in the overall nonlinear solver. In this paper, we review the advantages and disadvantages of finite difference approximations of these matrix-vector products for climate dynamics within the spectral element shallow water dynamical core of the Community Atmosphere Model (CAM). C1 [Woodward, Carol S.; Gardner, David J.] Lawrence Livermore Natl Lab, Livermore, CA USA. [Evans, Katherine J.] Oak Ridge Natl Lab, Oak Ridge, TN USA. RP Woodward, CS (reprint author), Lawrence Livermore Natl Lab, Livermore, CA USA. EM woodward6@llnl.gov; gardner48@llnl.gov; evanskj@ornl.gov RI Woodward, Carol/M-4008-2014; OI Evans, Katherine/0000-0001-8174-6450 NR 24 TC 0 Z9 0 U1 0 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA SARA BURGERHARTSTRAAT 25, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1877-0509 J9 PROCEDIA COMPUT SCI PY 2015 VL 51 BP 2036 EP 2045 DI 10.1016/j.procs.2015.05.468 PG 10 WC Computer Science, Interdisciplinary Applications; Computer Science, Theory & Methods SC Computer Science GA BE6DP UT WOS:000373939100209 ER PT S AU Archibald, R Evans, KJ Salinger, A AF Archibald, R. Evans, K. J. Salinger, A. BE Koziel, S Leifsson, L Lees, M Krzhizhanovskaya, VV Dongarra, J Sloot, PMA TI Accelerating Time Integration for the Shallow Water Equations on the Sphere Using GPUs SO INTERNATIONAL CONFERENCE ON COMPUTATIONAL SCIENCE, ICCS 2015 COMPUTATIONAL SCIENCE AT THE GATES OF NATURE SE Procedia Computer Science LA English DT Proceedings Paper CT 15th Annual International Conference on Computational Science (ICCS) CY JUN 01-03, 2015 CL Reykjavik Univ, Reykjavik, ICELAND SP Elsevier, Univ Amsterdam, NTU Singapore, Univ Tennessee HO Reykjavik Univ DE Implicit Timestepping; GPU; Trilinos ID DIFFERENTIAL-EQUATIONS; SOLUTION FRAMEWORK; APPROXIMATIONS; IMPLICIT; MODEL AB The push towards larger and larger computational platforms has made it possible for climate simulations to resolve climate dynamics across multiple spatial and temporal scales. This direction in climate simulation has created a strong need to develop scalable time-stepping methods capable of accelerating throughput on high performance computing. This work details the recent advances in the implementation of implicit time stepping on a spectral element cube-sphere grid using graphical processing units (GPU) based machines. We demonstrate how solvers in the Trilinos project are interfaced with ACME and GPU kernels can significantly increase computational speed of the residual calculations in the implicit time stepping method for the shallow water equations on the sphere. We show the optimization gains and data structure reorganization that facilitates the performance improvements. C1 [Archibald, R.; Evans, K. J.] Oak Ridge Natl Lab, Climate Change Sci Inst, Oak Ridge, TN USA. [Evans, K. J.] Oak Ridge Natl Lab, Computat Earth Sci Grp, Oak Ridge, TN USA. [Archibald, R.] Oak Ridge Natl Lab, Computat & Appl Math Grp, Oak Ridge, TN USA. [Salinger, A.] Sandia Natl Labs, Computat Math, Albuquerque, NM 87185 USA. RP Archibald, R (reprint author), Oak Ridge Natl Lab, Climate Change Sci Inst, Oak Ridge, TN USA. RI Archibald, Rick/I-6238-2016; OI Archibald, Rick/0000-0002-4538-9780; Evans, Katherine/0000-0001-8174-6450 NR 28 TC 0 Z9 0 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA SARA BURGERHARTSTRAAT 25, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1877-0509 J9 PROCEDIA COMPUT SCI PY 2015 VL 51 BP 2046 EP 2055 DI 10.1016/j.procs.2015.05.470 PG 10 WC Computer Science, Interdisciplinary Applications; Computer Science, Theory & Methods SC Computer Science GA BE6DP UT WOS:000373939100210 ER PT S AU Newman, C Womeldorff, G Chacon, L Knoll, DA AF Newman, Christopher Womeldorff, Geoff Chacon, Luis Knoll, Dana A. BE Koziel, S Leifsson, L Lees, M Krzhizhanovskaya, VV Dongarra, J Sloot, PMA TI High-Order/Low-Order Methods for Ocean Modeling SO INTERNATIONAL CONFERENCE ON COMPUTATIONAL SCIENCE, ICCS 2015 COMPUTATIONAL SCIENCE AT THE GATES OF NATURE SE Procedia Computer Science LA English DT Proceedings Paper CT 15th Annual International Conference on Computational Science (ICCS) CY JUN 01-03, 2015 CL Reykjavik Univ, Reykjavik, ICELAND SP Elsevier, Univ Amsterdam, NTU Singapore, Univ Tennessee HO Reykjavik Univ DE HOLO methods; ocean modeling; IMEX method; nonlinear elimination ID RADIATIVE-TRANSFER PROBLEMS; IN-CELL ALGORITHM; NONLINEAR ACCELERATION; IMPLICIT; EFFICIENT; SIMULATION; CONSISTENT; EQUATIONS AB We examine a High Order / Low Order (HOLO) approach for a z-level ocean model and show that the traditional semi-implicit and split-explicit methods, as well as a recent preconditioning strategy, can easily be cast in the framework of HOLO methods. The HOLO formulation admits an implicit-explicit method that is algorithmically scalable and second-order accurate, allowing timesteps much larger than the barotropic time scale. We show how HOLO approaches, in particular the implicit-explicit method, can provide a solid route for ocean simulation to heterogeneous computing and exascale environments. C1 [Newman, Christopher] Los Alamos Natl Lab, Fluid Dynam & Solid Mech Grp T 3, POB 1663, Los Alamos, NM 87545 USA. [Womeldorff, Geoff] Los Alamos Natl Lab, Appl Comp Sci Grp CCS 7, Los Alamos, NM 87545 USA. [Chacon, Luis] Los Alamos Natl Lab, Appl Math & Plasma Phys Grp T 5, Los Alamos, NM 87545 USA. [Knoll, Dana A.] Los Alamos Natl Lab, Integrated Design & Assessment Grp XTD IDA, Los Alamos, NM 87545 USA. RP Newman, C (reprint author), Los Alamos Natl Lab, Fluid Dynam & Solid Mech Grp T 3, POB 1663, Los Alamos, NM 87545 USA. EM cnewman@lanl.gov; womeld@lanl.gov; chacon@lanl.gov; nol@lanl.gov OI Chacon, Luis/0000-0002-4566-8763; Womeldorff, Geoff/0000-0003-0383-8100 NR 29 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA SARA BURGERHARTSTRAAT 25, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1877-0509 J9 PROCEDIA COMPUT SCI PY 2015 VL 51 BP 2086 EP 2096 DI 10.1016/j.procs.2015.05.477 PG 11 WC Computer Science, Interdisciplinary Applications; Computer Science, Theory & Methods SC Computer Science GA BE6DP UT WOS:000373939100214 ER PT S AU Spotz, WF Smith, TM Demeshko, IP Fike, JA AF Spotz, William F. Smith, Thomas M. Demeshko, Irina P. Fike, Jeffrey A. BE Koziel, S Leifsson, L Lees, M Krzhizhanovskaya, VV Dongarra, J Sloot, PMA TI Aeras: A Next Generation Global Atmosphere Model SO INTERNATIONAL CONFERENCE ON COMPUTATIONAL SCIENCE, ICCS 2015 COMPUTATIONAL SCIENCE AT THE GATES OF NATURE SE Procedia Computer Science LA English DT Proceedings Paper CT 15th Annual International Conference on Computational Science (ICCS) CY JUN 01-03, 2015 CL Reykjavik Univ, Reykjavik, ICELAND SP Elsevier, Univ Amsterdam, NTU Singapore, Univ Tennessee HO Reykjavik Univ DE Global atmosphere model; performance portability; uncertainty quantification AB Sandia National Laboratories is developing a new global atmosphere model named Aeras that is performance portable and supports the quantification of uncertainties. These next-generation capabilities are enabled by building Aeras on top of Albany, a code base that supports the rapid development of scientific application codes while leveraging Sandia's foundational mathematics and computer science packages in Trilinos and Dakota. Embedded uncertainty quantification (UQ) is an original design capability of Albany, and performance portability is a recent upgrade. Other required features, such as shell-type elements, spectral elements, efficient explicit and semi-implicit time-stepping, transient sensitivity analysis, and concurrent ensembles, were not components of Albany as the project began, and have been (or are being) added by the Aeras team. We present early UQ and performance portability results for the shallow water equations. C1 [Spotz, William F.; Smith, Thomas M.; Demeshko, Irina P.; Fike, Jeffrey A.] Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. RP Spotz, WF (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. EM wfspotz@sandia.gov; tmsmith@sandia.gov; ipdemes@sandia.gov; jafike@sandia.gov NR 15 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA SARA BURGERHARTSTRAAT 25, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1877-0509 J9 PROCEDIA COMPUT SCI PY 2015 VL 51 BP 2097 EP 2106 DI 10.1016/j.procs.2015.05.478 PG 10 WC Computer Science, Interdisciplinary Applications; Computer Science, Theory & Methods SC Computer Science GA BE6DP UT WOS:000373939100215 ER PT S AU Mahajan, S Evans, KJ Branstetter, M Anantharaj, V Leifeld, JK AF Mahajan, Salil Evans, Katherine J. Branstetter, Marcia Anantharaj, Valentine Leifeld, Juliann K. BE Koziel, S Leifsson, L Lees, M Krzhizhanovskaya, VV Dongarra, J Sloot, PMA TI Fidelity of Precipitation Extremes in High Resolution Global Climate Simulations. SO INTERNATIONAL CONFERENCE ON COMPUTATIONAL SCIENCE, ICCS 2015 COMPUTATIONAL SCIENCE AT THE GATES OF NATURE SE Procedia Computer Science LA English DT Proceedings Paper CT 15th Annual International Conference on Computational Science (ICCS) CY JUN 01-03, 2015 CL Reykjavik Univ, Reykjavik, ICELAND SP Elsevier, Univ Amsterdam, NTU Singapore, Univ Tennessee HO Reykjavik Univ DE climate extremes; non-stationarity of extremes; high resolution climate modeling ID INTENSE PRECIPITATION; FREQUENCY-ANALYSIS; REGION; TRENDS; MODEL AB Precipitation extremes have tangible societal impacts. Here, we assess if current state of the art global climate model simulations at high spatial resolutions (0.35 degrees x0.35 degrees) capture the observed behavior of precipitation extremes in the past few decades over the continental US. We design a correlation-based regionalization framework to quantify precipitation extremes, where samples of extreme events for a grid box may also be drawn from neighboring grid boxes with statistically equal means and statistically significant temporal correlations. We model precipitation extremes with the Generalized Extreme Value (GEV) distribution fits to time series of annual maximum precipitation. Non-stationarity of extremes is captured by including a time-dependent parameter in the GEV distribution. Our analysis reveals that the high-resolution model substantially improves the simulation of stationary precipitation extreme statistics particularly over the Northwest Pacific coastal region and the Southeast US. Observational data exhibits significant non-stationary behavior of extremes only over some parts of the Western US, with declining trends in the extremes. While the high resolution simulations improve upon the low resolution model in simulating this non-stationary behavior, the trends are statistically significant only over some of those regions. C1 [Mahajan, Salil; Evans, Katherine J.; Branstetter, Marcia; Anantharaj, Valentine] Oak Ridge Natl Lab, Computat Earth Sci Grp, Oak Ridge, TN USA. [Mahajan, Salil; Evans, Katherine J.; Branstetter, Marcia; Anantharaj, Valentine] Oak Ridge Natl Lab, Climate Change Sci Inst, Oak Ridge, TN USA. [Leifeld, Juliann K.] Univ Minnesota, Dept Math, Minneapolis, MN 55455 USA. RP Mahajan, S (reprint author), Oak Ridge Natl Lab, Computat Earth Sci Grp, Oak Ridge, TN USA. EM mahajans@ornl.gov OI Mahajan, Salil/0000-0001-5767-8590; Evans, Katherine/0000-0001-8174-6450 NR 26 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA SARA BURGERHARTSTRAAT 25, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1877-0509 J9 PROCEDIA COMPUT SCI PY 2015 VL 51 BP 2178 EP 2187 DI 10.1016/j.procs.2015.05.492 PG 10 WC Computer Science, Interdisciplinary Applications; Computer Science, Theory & Methods SC Computer Science GA BE6DP UT WOS:000373939100223 ER PT S AU Kepner, J Bader, D Buluc, A Gilbert, J Mattson, T Meyerhenke, H AF Kepner, Jeremy Bader, David Buluc, Aydin Gilbert, John Mattson, Timothy Meyerhenke, Henning BE Koziel, S Leifsson, L Lees, M Krzhizhanovskaya, VV Dongarra, J Sloot, PMA TI Graphs, Matrices, and the GraphBLAS: Seven Good Reasons SO INTERNATIONAL CONFERENCE ON COMPUTATIONAL SCIENCE, ICCS 2015 COMPUTATIONAL SCIENCE AT THE GATES OF NATURE SE Procedia Computer Science LA English DT Proceedings Paper CT 15th Annual International Conference on Computational Science (ICCS) CY JUN 01-03, 2015 CL Reykjavik Univ, Reykjavik, ICELAND SP Elsevier, Univ Amsterdam, NTU Singapore, Univ Tennessee HO Reykjavik Univ DE graphs; algorithms; matrices; linear algebra; software standards AB The analysis of graphs has become increasingly important to a wide range of applications. Graph analysis presents a number of unique challenges in the areas of (1) software complexity, (2) data complexity, (3) security, (4) mathematical complexity, (5) theoretical analysis, (6) serial performance, and (7) parallel performance. Implementing graph algorithms using matrix-based approaches provides a number of promising solutions to these challenges. The GraphBLAS standard (istc-bigdata.org/GraphBlas) is being developed to bring the potential of matrix based graph algorithms to the broadest possible audience. The GraphBLAS mathematically defines a core set of matrix-based graph operations that can be used to implement a wide class of graph algorithms in a wide range of programming environments. This paper provides an introduction to the GraphBLAS and describes how the GraphBLAS can be used to address many of the challenges associated with analysis of graphs. C1 [Kepner, Jeremy] MIT, Cambridge, MA 02139 USA. [Bader, David] Georgia Inst Technol, Atlanta, GA 30332 USA. [Bader, David] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. [Gilbert, John] Univ Calif Santa Barbara, Santa Barbara, CA 93106 USA. [Mattson, Timothy] Intel Corp, Portland, OR USA. [Meyerhenke, Henning] Karlsruhe Inst Technol, D-76021 Karlsruhe, Germany. RP Kepner, J (reprint author), MIT, Cambridge, MA 02139 USA. EM kepner@ll.mit.edu; bader@cc.gatech.edu; abuluc@lbl.gov; gilbert@cs.ucsb.edu; timothy.g.mattson@intel.com; henning.meyerhenke@kit.edu NR 40 TC 3 Z9 3 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA SARA BURGERHARTSTRAAT 25, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1877-0509 J9 PROCEDIA COMPUT SCI PY 2015 VL 51 BP 2453 EP 2462 DI 10.1016/j.procs.2015.05.353 PG 10 WC Computer Science, Interdisciplinary Applications; Computer Science, Theory & Methods SC Computer Science GA BE6DP UT WOS:000373939100252 ER PT S AU Norman, MR AF Norman, Matthew R. BE Koziel, S Leifsson, L Lees, M Krzhizhanovskaya, VV Dongarra, J Sloot, PMA TI Arbitrarily High-Order-Accurate, Hermite WENO Limited, Boundary-Averaged Multi-Moment Constrained Finite-Volume (BA-MCV) Schemes for 1-D Transport SO INTERNATIONAL CONFERENCE ON COMPUTATIONAL SCIENCE, ICCS 2015 COMPUTATIONAL SCIENCE AT THE GATES OF NATURE SE Procedia Computer Science LA English DT Proceedings Paper CT 15th Annual International Conference on Computational Science (ICCS) CY JUN 01-03, 2015 CL Reykjavik Univ, Reykjavik, ICELAND SP Elsevier, Univ Amsterdam, NTU Singapore, Univ Tennessee HO Reykjavik Univ DE Hermite WENO; multi-moment; finite-volume; ADER; transport ID CONSERVATION-LAWS; SYSTEMS AB This study introduces the Boundary Averaged Multi-moment Constrained finite-Volume (BA-MCV) scheme for 1-D transport with Hermite Weighted Essentially Non-Oscillatory (HWENO) limiting using the ADER Differential Transform (ADER-DT) time discretization. The BA-MCV scheme evolves a cell average using a Finite-Volume (FV) scheme, and it adds further constraints as point wise derivatives of the state at cell boundaries, which are evolved in strong form using PDE derivatives. The resulting scheme maintains a Maximum Stable CFL (MSCFL) value of one no matter how high-order the scheme is. Also, parallel communication requirements are very low and will be described. h-refinement experiments demonstrate proper convergence order, and p-refinement experiments demonstrate expected exponential convergence. The overall ADER-DT + BA-MCV + HWENO scheme is a scalable and larger time step alternative to Galerkin methods for multi-moment fluid simulation in climate and weather applications. C1 [Norman, Matthew R.] Oak Ridge Natl Lab, Oak Ridge, TN USA. RP Norman, MR (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN USA. EM normanmr@ornl.gov NR 10 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA SARA BURGERHARTSTRAAT 25, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1877-0509 J9 PROCEDIA COMPUT SCI PY 2015 VL 51 BP 2688 EP 2693 DI 10.1016/j.procs.2015.05.385 PG 6 WC Computer Science, Interdisciplinary Applications; Computer Science, Theory & Methods SC Computer Science GA BE6DP UT WOS:000373939100276 ER PT S AU Chapuis, G Djidjev, H AF Chapuis, Guillaume Djidjev, Hristo BE Lirkov, I Margenov, SD Wasniewski, J TI Shortest-Path Queries in Planar Graphs on GPU-Accelerated Architectures SO LARGE-SCALE SCIENTIFIC COMPUTING, LSSC 2015 SE Lecture Notes in Computer Science LA English DT Proceedings Paper CT 10th International Conference on Large-Scale Scientific Computations (LSSC) CY JUN 08-12, 2015 CL Bulgarian Acad Sci, Sozopol, BULGARIA SP Inst Informat & Communicat Technol, Soc Ind & Appl Math, Sozopol municipality HO Bulgarian Acad Sci DE Shortest path problems; Graph algorithms; Distributed computing; GPU computing; Graph partitioning ID ALGORITHMS AB We develop an efficient parallel algorithm for answering shortest-path queries in planar graphs and implement it on a multi-node CPU-GPU clusters. The algorithm uses a divide-and-conquer approach for decomposing the input graph into small and roughly equal subgraphs and constructs a distributed data structure containing shortest distances within each of those subgraphs and between their boundary vertices. For a planar graph with n vertices, that data structure needs O(n) storage per processor and allows queries to be answered in O(n(1/4)) time. C1 [Chapuis, Guillaume; Djidjev, Hristo] Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. RP Chapuis, G (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. EM gchapuis@lanl.gov; djidjev@lanl.gov NR 9 TC 1 Z9 1 U1 0 U2 0 PU SPRINGER INT PUBLISHING AG PI CHAM PA GEWERBESTRASSE 11, CHAM, CH-6330, SWITZERLAND SN 0302-9743 BN 978-3-319-26520-9; 978-3-319-26519-3 J9 LECT NOTES COMPUT SC PY 2015 VL 9374 BP 53 EP 60 DI 10.1007/978-3-319-26520-9_5 PG 8 WC Computer Science, Interdisciplinary Applications; Computer Science, Theory & Methods SC Computer Science GA BE6CJ UT WOS:000373881700005 ER PT B AU Beresnyak, A AF Beresnyak, Andrey BE Pogorelov, NV Audit, E Zank, GP TI On the Parallel Spectrum and Anisotropy in MHD Turbulence SO NUMERICAL MODELING OF SPACE PLASMA FLOWS: ASTRONUM-2014 SE Astronomical Society of the Pacific Conference Series LA English DT Proceedings Paper CT 9th Annual International Conference on Numerical Modeling of Space Plasma Flows (ASTRONUM-2014) CY JUN 23-27, 2014 CL Long Beach, CA SP Univ Alabama, Ctr Space Plasma & Aeronomic Res, CEA-CNRS-INRIA-UPsud-UVSQ, Maison Simulat ID SOLAR-WIND TURBULENCE; MAGNETOHYDRODYNAMIC TURBULENCE; ALFVENIC TURBULENCE; INERTIAL-RANGE; MAGNETIC-FIELD; POWER; SIMULATIONS AB MHD turbulence is anisotropic and shows different spectral slopes measured parallel and perpendicular to the local magnetic field. Solar wind observations typically show a k(-2) power law scaling, which is much steeper than the perpendicular scaling, typically k(-5/3). In this paper I show that this scaling could be interpreted as the Lagrangian frequency spectrum omega(-2) of the evolving Afven perturbations. As Alfven waves propagate exactly along magnetic field lines, the measurement of the spectrum along the field line is equivalent to the measurement of the frequency spectrum. This was tested using high-resolution simulations of MHD turbulence, e.g., I verified that the cutoff of the parallel spectrum scales as Kolmogorov timescale, not lengthscale. C1 [Beresnyak, Andrey] Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. [Beresnyak, Andrey] KTH Royal Inst Technol, Nordita, SE-10691 Stockholm, Sweden. [Beresnyak, Andrey] Stockholm Univ, SE-10691 Stockholm, Sweden. RP Beresnyak, A (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. NR 39 TC 0 Z9 0 U1 0 U2 0 PU ASTRONOMICAL SOC PACIFIC PI SAN FRANCISCO PA 390 ASHTON AVE, SAN FRANCISCO, CA 94112 USA BN 978-1-58381-880-0 J9 ASTR SOC P PY 2015 VL 498 BP 3 EP 9 PG 7 WC Astronomy & Astrophysics; Mathematics, Applied SC Astronomy & Astrophysics; Mathematics GA BE6DR UT WOS:000373970200001 ER PT B AU Chen, KJ Heger, A Woosley, S Almgren, A Whalen, DJ AF Chen, Ke-Jung Heger, Alexander Woosley, Stan Almgren, Arm Whalen, Daniel J. BE Pogorelov, NV Audit, E Zank, GP TI Pair-Instability Supernovae of Non-Zero Metallicity Stars SO NUMERICAL MODELING OF SPACE PLASMA FLOWS: ASTRONUM-2014 SE Astronomical Society of the Pacific Conference Series LA English DT Proceedings Paper CT 9th Annual International Conference on Numerical Modeling of Space Plasma Flows (ASTRONUM-2014) CY JUN 23-27, 2014 CL Long Beach, CA SP Univ Alabama, Ctr Space Plasma & Aeronomic Res, CEA-CNRS-INRIA-UPsud-UVSQ, Maison Simulat ID POPULATION III; HYDRODYNAMICS; SIMULATIONS; EXPLOSION; EVOLUTION; UNIVERSE; SPECTRA; CASTRO AB Observational evidence suggests that some very massive stars in the local Universe may die as pair-instability supernovae. We present 2D simulations of the pair-instability supernova of a non-zero metallicity star. We find that very little mixing occurs in this explosion because metals in the stellar envelope drive strong winds that strip the hydrogen envelope from the star prior to death. Consequently, a reverse shock cannot form and trigger fluid instabilities during the supernova. Only weak mixing driven by nuclear burning occurs in the earliest stages of the supernova, and it is too weak to affect the observational signatures of the explosion. C1 [Chen, Ke-Jung; Woosley, Stan] Univ Calif Santa Cruz, Dept Astron & Astrophys, Santa Cruz, CA 95064 USA. [Chen, Ke-Jung; Heger, Alexander] Univ Minnesota, Sch Phys & Astron, Minneapolis, MN 55455 USA. [Heger, Alexander] Monash Univ, Monash Ctr Astrophys, Clayton, Vic 3800, Australia. [Heger, Alexander] Univ Notre Dame, Joint Inst Nucl Astrophys, Notre Dame, IN 46556 USA. [Almgren, Arm] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Ctr Computat Sci & Engn, Berkeley, CA 94720 USA. [Whalen, Daniel J.] Heidelberg Univ, Inst Theoret Astrophys, Zentrum Astron, D-69120 Heidelberg, Germany. RP Chen, KJ (reprint author), Univ Calif Santa Cruz, Dept Astron & Astrophys, Santa Cruz, CA 95064 USA. EM kchen@ucolick.org NR 20 TC 0 Z9 0 U1 0 U2 0 PU ASTRONOMICAL SOC PACIFIC PI SAN FRANCISCO PA 390 ASHTON AVE, SAN FRANCISCO, CA 94112 USA BN 978-1-58381-880-0 J9 ASTR SOC P PY 2015 VL 498 BP 47 EP 52 PG 6 WC Astronomy & Astrophysics; Mathematics, Applied SC Astronomy & Astrophysics; Mathematics GA BE6DR UT WOS:000373970200008 ER PT B AU Endeve, E Hauck, CD Xing, YL Mezzacappa, A AF Endeve, Eirik Hauck, Cory D. Xing, Yulong Mezzacappa, Anthony BE Pogorelov, NV Audit, E Zank, GP TI Towards Robust Discontinuous Galerkin Methods for General Relativistic Neutrino Radiation Transport SO NUMERICAL MODELING OF SPACE PLASMA FLOWS: ASTRONUM-2014 SE Astronomical Society of the Pacific Conference Series LA English DT Proceedings Paper CT 9th Annual International Conference on Numerical Modeling of Space Plasma Flows (ASTRONUM-2014) CY JUN 23-27, 2014 CL Long Beach, CA SP Univ Alabama, Ctr Space Plasma & Aeronomic Res, CEA-CNRS-INRIA-UPsud-UVSQ, Maison Simulat ID CORE-COLLAPSE SUPERNOVAE; HYDRODYNAMICS; SIMULATIONS; MECHANISM; STATE AB With an eye towards simulating neutrino transport in core-collapse supernovae, we have developed a conservative, robust, and high-order numerical method for solving the general relativistic phase space advection problem in stationary spacetimes. The method achieves high-order accuracy using Discontinuous Galerkin discretization and Runge-Kutta time integration. For robustness, care is taken to ensure that the physical bounds on the phase space distribution function are preserved; i.e., f is an element of [0, 1]. We briefly describe the bound-preserving scheme, and present results from numerical experiments in spherical symmetry adopting the Schwarzschild metric, which demonstrate that the method preserves the bounds on the distribution function. C1 [Endeve, Eirik; Hauck, Cory D.; Xing, Yulong] Oak Ridge Natl Lab, Computat & Appl Math Grp, Oak Ridge, TN 37831 USA. [Endeve, Eirik; Mezzacappa, Anthony] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA. [Hauck, Cory D.; Xing, Yulong] Univ Tennessee, Dept Math, Knoxville, TN 37996 USA. RP Endeve, E (reprint author), Oak Ridge Natl Lab, Computat & Appl Math Grp, Oak Ridge, TN 37831 USA. RI Mezzacappa, Anthony/B-3163-2017 OI Mezzacappa, Anthony/0000-0001-9816-9741 NR 16 TC 0 Z9 0 U1 0 U2 0 PU ASTRONOMICAL SOC PACIFIC PI SAN FRANCISCO PA 390 ASHTON AVE, SAN FRANCISCO, CA 94112 USA BN 978-1-58381-880-0 J9 ASTR SOC P PY 2015 VL 498 BP 59 EP 64 PG 6 WC Astronomy & Astrophysics; Mathematics, Applied SC Astronomy & Astrophysics; Mathematics GA BE6DR UT WOS:000373970200010 ER PT B AU Klein, RI Li, P McKee, CF AF Klein, Richard I. Li, PakShing McKee, Christopher F. BE Pogorelov, NV Audit, E Zank, GP TI Multi-Physics Feedback Simulations with Realistic Initial Conditions of the Formation of Star Clusters: From Large Scale Magnetized Clouds to Turbulent Clumps to Cores to Stars SO NUMERICAL MODELING OF SPACE PLASMA FLOWS: ASTRONUM-2014 SE Astronomical Society of the Pacific Conference Series LA English DT Proceedings Paper CT 9th Annual International Conference on Numerical Modeling of Space Plasma Flows (ASTRONUM-2014) CY JUN 23-27, 2014 CL Long Beach, CA SP Univ Alabama, Ctr Space Plasma & Aeronomic Res, CEA-CNRS-INRIA-UPsud-UVSQ, Maison Simulat ID MOLECULAR CLOUDS; FRAGMENTATION; FIELDS AB Multi-physics zoom-in adaptive mesh refinement simulations with feedback and realistic initial conditions, starting from large scale turbulent molecular clouds through the formation of clumps and cores to the formation os stellar clusters are presented. I give a summary of results at the different scales undergoing gravitational collapse from cloud to core to cluster formation. Detailed comparisons with observations are made at each stage of the simulations. In particular, properties of the magnetized clumps are compared with recent observations of Crutcher et al. 2010 and Crutcher 2012 and the magnetic field orientation in cloud clumps relative to the global mean field of the inter-cloud medium (Li et al. 2009). The Initial Mass Function (IMF) obtained is compared with the Chabrier IMF and the protostellar mass function of the cluster is compared with different theories. C1 [Klein, Richard I.] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. [Klein, Richard I.; Li, PakShing; McKee, Christopher F.] Univ Calif Berkeley, Dept Astron, Berkeley, CA 94720 USA. RP Klein, RI (reprint author), Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. NR 15 TC 0 Z9 0 U1 1 U2 1 PU ASTRONOMICAL SOC PACIFIC PI SAN FRANCISCO PA 390 ASHTON AVE, SAN FRANCISCO, CA 94112 USA BN 978-1-58381-880-0 J9 ASTR SOC P PY 2015 VL 498 BP 91 EP 101 PG 11 WC Astronomy & Astrophysics; Mathematics, Applied SC Astronomy & Astrophysics; Mathematics GA BE6DR UT WOS:000373970200015 ER PT B AU Li, ST Li, H AF Li, Shengtai Li, Hui BE Pogorelov, NV Audit, E Zank, GP TI Long-Time Sustainability of Rossby Wave Instability in Protoplanetary Disks with Dead Zone SO NUMERICAL MODELING OF SPACE PLASMA FLOWS: ASTRONUM-2014 SE Astronomical Society of the Pacific Conference Series LA English DT Proceedings Paper CT 9th Annual International Conference on Numerical Modeling of Space Plasma Flows (ASTRONUM-2014) CY JUN 23-27, 2014 CL Long Beach, CA SP Univ Alabama, Ctr Space Plasma & Aeronomic Res, CEA-CNRS-INRIA-UPsud-UVSQ, Maison Simulat ID ACCRETION DISKS AB We have run 2D simulations to investigate the generation and sustainability of Rossby wave instability (RWI) in proto-planetary disks with constant viscosity and for disks with low viscosity regions (dead zone). For the constant viscosity case, the development of RWI requires a low viscosity and life time of the RWI is short. We also find that the vortex, when it migrates, does so much faster than the diskhAZs viscous drift rate. For disks with dead zone case, a much larger viscosity can be used and the RWI vortex can be sustained for a long time, even the life time of the disk, depending on the width and depth of the dead zone. For a narrow dea zone, the vortex depicts a periodic pattern with a period inversely proportional to the viscosity. If the dead-zone width exceeds some threshold, the periodicity of the RWI disappears. C1 [Li, Shengtai; Li, Hui] Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. RP Li, ST (reprint author), Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. NR 10 TC 1 Z9 1 U1 0 U2 1 PU ASTRONOMICAL SOC PACIFIC PI SAN FRANCISCO PA 390 ASHTON AVE, SAN FRANCISCO, CA 94112 USA BN 978-1-58381-880-0 J9 ASTR SOC P PY 2015 VL 498 BP 102 EP 107 PG 6 WC Astronomy & Astrophysics; Mathematics, Applied SC Astronomy & Astrophysics; Mathematics GA BE6DR UT WOS:000373970200016 ER PT B AU Mezzacappa, A Lentz, EJ Bruenn, SW Hix, WR Messer, OEB Endeve, E Blondin, JM Harris, JA Marronetti, P Yakunin, KN Lingerfelt, EJ AF Mezzacappa, Anthony Lentz, Eric J. Bruenn, Stephen W. Hix, W. Raphael Messer, O. E. Bronson Endeve, Eirik Blondin, John M. Harris, J. Austin Marronetti, Pedro Yakunin, Konstantin N. Lingerfelt, Eric J. BE Pogorelov, NV Audit, E Zank, GP TI A Three-Dimensional Neutrino-Driven Core Collapse Supernova Explosion of a 15 M-circle dot Star SO NUMERICAL MODELING OF SPACE PLASMA FLOWS: ASTRONUM-2014 SE Astronomical Society of the Pacific Conference Series LA English DT Proceedings Paper CT 9th Annual International Conference on Numerical Modeling of Space Plasma Flows (ASTRONUM-2014) CY JUN 23-27, 2014 CL Long Beach, CA SP Univ Alabama, Ctr Space Plasma & Aeronomic Res, CEA-CNRS-INRIA-UPsud-UVSQ, Maison Simulat ID SIMULATIONS; MECHANISM; EQUATION AB We present results from an ab initio three-dimensional, multi-physics core collapse supernova simulation for the case of a 15 M-circle dot progenitor. Our simulation includes multi-frequency neutrino transport with state-of-the-art neutrino interactions in the "ray-by-ray" approximation, and approximate general relativity. Our model exhibits a neutrino-driven explosion. The shock radius begins an outward trajectory at approximately 275 ms after bounce, giving the first indication of a developing explosion in the model. The onset of this shock expansion is delayed relative to our two-dimensional counterpart model, which begins at approximately 200 ms after core bounce. At a time of 441 ms after bounce, the angle-averaged shock radius in our three-dimensional model has reached 751 km. Further quantitative analysis of the outcomes in this model must await further development of the post-bounce dynamics and a simulation that will extend well beyond 1 s after stellar core bounce, based on the results for the same progenitor in the context of our two-dimensional, counterpart model. This more complete analysis will determine whether or not the explosion is robust and whether or not observables such as the explosion energy, Ni-56 mass, etc. are in agreement with observations. Nonetheless, the onset of explosion in our ab initio three-dimensional multi-physics model with multifrequency neutrino transport and general relativity is encouraging. C1 [Mezzacappa, Anthony; Lentz, Eric J.; Endeve, Eirik; Harris, J. Austin] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA. [Mezzacappa, Anthony; Lentz, Eric J.; Yakunin, Konstantin N.] Oak Ridge Natl Lab, Joint Inst Computat Sci, Oak Ridge, TN 37831 USA. [Lentz, Eric J.; Hix, W. Raphael; Messer, O. E. Bronson] Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA. [Bruenn, Stephen W.] Florida Atlantic Univ, Dept Phys, Boca Raton, FL 33431 USA. [Messer, O. E. Bronson] Oak Ridge Natl Lab, Natl Ctr Computat Sci, Oak Ridge, TN 37831 USA. [Endeve, Eirik; Lingerfelt, Eric J.] Oak Ridge Natl Lab, Comp Sci & Math Div, Oak Ridge, TN 37831 USA. [Blondin, John M.] N Carolina State Univ, Dept Phys, Raleigh, NC 27695 USA. [Marronetti, Pedro] Natl Sci Fdn, Phys Div, Arlington, VA 22230 USA. RP Mezzacappa, A (reprint author), Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA. RI Messer, Bronson/G-1848-2012; Mezzacappa, Anthony/B-3163-2017 OI Messer, Bronson/0000-0002-5358-5415; Mezzacappa, Anthony/0000-0001-9816-9741 NR 23 TC 0 Z9 0 U1 0 U2 0 PU ASTRONOMICAL SOC PACIFIC PI SAN FRANCISCO PA 390 ASHTON AVE, SAN FRANCISCO, CA 94112 USA BN 978-1-58381-880-0 J9 ASTR SOC P PY 2015 VL 498 BP 108 EP 114 PG 7 WC Astronomy & Astrophysics; Mathematics, Applied SC Astronomy & Astrophysics; Mathematics GA BE6DR UT WOS:000373970200017 ER PT B AU Loring, B Karimabadi, H Rortershteyn, V AF Loring, B. Karimabadi, H. Rortershteyn, V. BE Pogorelov, NV Audit, E Zank, GP TI A Screen Space GPGPU Surface LIC Algorithm for Distributed Memory Data Parallel Sort Last Rendering Infrastructures SO NUMERICAL MODELING OF SPACE PLASMA FLOWS: ASTRONUM-2014 SE Astronomical Society of the Pacific Conference Series LA English DT Proceedings Paper CT 9th Annual International Conference on Numerical Modeling of Space Plasma Flows (ASTRONUM-2014) CY JUN 23-27, 2014 CL Long Beach, CA SP Univ Alabama, Ctr Space Plasma & Aeronomic Res, CEA-CNRS-INRIA-UPsud-UVSQ, Maison Simulat AB The surface line integral convolution(LIC) visualization technique produces dense visualization of vector fields on arbitrary surfaces. We present a screen space surface LIC algorithm for use in distributed memory data parallel sort last rendering infrastructures. The motivations for our work are to support analysis of datasets that are too large to fit in the main memory of a single computer and compatibility with prevalent parallel scientific visualization tools such as ParaView and VisIt. By working in screen space using OpenGL we can leverage the computational power of GPUs when they are available and run without them when they are not. We address efficiency and performance issues that arise from the transformation of data from physical to screen space by selecting an alternate screen space domain decomposition. We analyze the algorithm's scaling behavior with and without GPUs on two high performance computing systems using data from turbulent plasma simulations. C1 [Loring, B.] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. [Karimabadi, H.; Rortershteyn, V.] Univ Calif San Diego, Dept Elect & Comp Engn, San Diego, CA 92103 USA. RP Loring, B (reprint author), Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. EM bloring@lbl.gov; homakar@gmail.com NR 10 TC 0 Z9 0 U1 0 U2 0 PU ASTRONOMICAL SOC PACIFIC PI SAN FRANCISCO PA 390 ASHTON AVE, SAN FRANCISCO, CA 94112 USA BN 978-1-58381-880-0 J9 ASTR SOC P PY 2015 VL 498 BP 231 EP 239 PG 9 WC Astronomy & Astrophysics; Mathematics, Applied SC Astronomy & Astrophysics; Mathematics GA BE6DR UT WOS:000373970200035 ER PT S AU Arendt, DL AF Arendt, Dustin L. BE DiGiacomo, E Lubiw, A TI SVEN: An Alternative Storyline Framework for Dynamic Graph Visualization SO GRAPH DRAWING AND NETWORK VISUALIZATION, GD 2015 SE Lecture Notes in Computer Science LA English DT Proceedings Paper CT 23rd International Symposium on Graph Drawing and Network Visualization (GD) CY SEP 24-26, 2015 CL Calif State Univ, Los Angeles, CA SP Tom Sawyer Software, YWorks, Microsoft, Springer HO Calif State Univ ID EVOLUTION C1 [Arendt, Dustin L.] Pacific NW Natl Lab, Richland, WA 99352 USA. RP Arendt, DL (reprint author), Pacific NW Natl Lab, Richland, WA 99352 USA. EM dustin.arendt@pnnl.gov NR 7 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER INT PUBLISHING AG PI CHAM PA GEWERBESTRASSE 11, CHAM, CH-6330, SWITZERLAND SN 0302-9743 BN 978-3-319-27261-0; 978-3-319-27260-3 J9 LECT NOTES COMPUT SC PY 2015 VL 9411 BP 554 EP 555 DI 10.1007/978-3-319-27261-0_48 PG 2 WC Computer Science, Artificial Intelligence; Computer Science, Information Systems; Computer Science, Interdisciplinary Applications; Computer Science, Theory & Methods; Robotics SC Computer Science; Robotics GA BE5YA UT WOS:000373628600048 ER PT B AU Bennion, K Moreno, G AF Bennion, Kevin Moreno, Gilberto GP ASME TI CONVECTIVE HEAT TRANSFER COEFFICIENTS OF AUTOMATIC TRANSMISSION FLUID JETS WITH IMPLICATIONS FOR ELECTRIC MACHINE THERMAL MANAGEMENT SO INTERNATIONAL TECHNICAL CONFERENCE AND EXHIBITION ON PACKAGING AND INTEGRATION OF ELECTRONIC AND PHOTONIC MICROSYSTEMS, 2015, VOL 3 LA English DT Proceedings Paper CT ASME International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems (InterPACK) CY JUL 06-09, 2015 CL San Francisco, CA SP ASME ID CIRCULAR JETS; LIQUID; OIL AB Thermal management for electric machines (motors/generators) is important as the automotive industry continues to transition to more electrically dominant vehicle propulsion systems. Cooling of the electric machine(s) in some electric vehicle traction drive applications is accomplished by impinging automatic transmission fluid (ATF) jets onto the machine's copper windings. In this study, we provide the results of experiments characterizing the thermal performance of ATF jets on surfaces representative of windings, using Ford's Mercon LV ATF. Experiments were carried out at various ATF temperatures and jet velocities to quantify the influence of these parameters on heat transfer coefficients. Fluid temperatures were varied from 50 degrees C to 90 degrees C to encompass potential operating temperatures within an automotive transaxle environment. The jet nozzle velocities were varied from 0.5 to 10 m/s. The experimental ATF heat transfer coefficient results provided in this report are a useful resource for understanding factors that influence the performance of ATF-based cooling systems for electric machines. C1 [Bennion, Kevin; Moreno, Gilberto] Natl Renewable Energy Lab, Golden, CO USA. RP Bennion, K (reprint author), Natl Renewable Energy Lab, Golden, CO USA. NR 14 TC 0 Z9 0 U1 1 U2 2 PU AMER SOC MECHANICAL ENGINEERS PI NEW YORK PA THREE PARK AVENUE, NEW YORK, NY 10016-5990 USA BN 978-0-7918-5690-1 PY 2015 AR V003T04A010 PG 9 WC Thermodynamics; Engineering, Mechanical SC Thermodynamics; Engineering GA BE5WD UT WOS:000373517400016 ER PT B AU Chugh, D Isfahani, RN Gluesenkemp, K Abdelaziz, O Moghaddam, S AF Chugh, Devesh Isfahani, Rasool Nasr Gluesenkemp, Kyle Abdelaziz, Omar Moghaddam, Saeed GP ASME TI A HYBRID ABSORPTION CYCLE FOR WATER HEATING, DEHUMIDIFICATION, AND EVAPORATIVE COOLING SO INTERNATIONAL TECHNICAL CONFERENCE AND EXHIBITION ON PACKAGING AND INTEGRATION OF ELECTRONIC AND PHOTONIC MICROSYSTEMS, 2015, VOL 3 LA English DT Proceedings Paper CT ASME International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems (InterPACK) CY JUL 06-09, 2015 CL San Francisco, CA SP ASME ID LIBR SOLUTION; SYSTEMS AB In this study, development of a novel system for combined water heating, dehumidification, and space cooling is discussed. The system absorbs water vapor from an air stream into an absorbent. The latent heat of absorption, released into the absorbent, is transferred into the process water that cools the absorbent. The solution is regenerated in the desorber, where it is heated by a heating fluid. The water vapor generated in the desorber is condensed and its heat of phase change is also transferred to the process water. The condensed water is then used in an evaporative cooling process to cool the dehumidified air exiting the absorber. Essentially, this open-absorption cycle collects space sensible heat and transfers it to hot water. Another novel feature of the cycle is recovery of the heat energy from the solution exiting the desorber by heat exchange with process water rather than with the solution exiting the absorber. This approach has enabled heating the process water from an inlet temperature of 15 degrees C to 57 degrees C (conforming to the required DOE building hot water standard) and compact fabrication of the absorber, solution heat exchanger, and desorber in plate and frame configuration. The system under development currently has a water heating capacity of 1.5 kW and a thermal. coefficient of performance (COP) of 1.45. C1 [Chugh, Devesh; Isfahani, Rasool Nasr; Moghaddam, Saeed] Univ Florida, Dept Mech & Aerosp Engn, Gainesville, FL 32611 USA. [Gluesenkemp, Kyle; Abdelaziz, Omar] Oak Ridge Natl Lab, Bldg Equipment Res Energy & Transportat Sci Div, Oak Ridge, TN USA. RP Moghaddam, S (reprint author), Univ Florida, Dept Mech & Aerosp Engn, Gainesville, FL 32611 USA. EM saeedmog@ufl.edu NR 16 TC 0 Z9 0 U1 1 U2 1 PU AMER SOC MECHANICAL ENGINEERS PI NEW YORK PA THREE PARK AVENUE, NEW YORK, NY 10016-5990 USA BN 978-0-7918-5690-1 PY 2015 AR V003T05A003 PG 9 WC Thermodynamics; Engineering, Mechanical SC Thermodynamics; Engineering GA BE5WD UT WOS:000373517400032 ER PT B AU Yates, L Bougher, TL Beechem, T Cola, BA Graham, S AF Yates, Luke Bougher, Thomas L. Beechem, Thomas Cola, Baratunde A. Graham, Samuel GP ASME TI THE IMPACT OF INTERFACIAL LAYERS ON THE THERMAL BOUNDARY RESISTANCE AND RESIDUAL STRESS IN GAN ON SI EPITAXIAL LAYERS SO INTERNATIONAL TECHNICAL CONFERENCE AND EXHIBITION ON PACKAGING AND INTEGRATION OF ELECTRONIC AND PHOTONIC MICROSYSTEMS, 2015, VOL 3 LA English DT Proceedings Paper CT ASME International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems (InterPACK) CY JUL 06-09, 2015 CL San Francisco, CA SP ASME ID THERMOREFLECTANCE AB The development of gallium nitride (GaN) on silicon (Si) substrates is a critical technology for potential low cost power electronics. These devices can accommodate faster switching speeds, hotter temperatures, and high voltages needed for power electronics applications. However, the lattice mismatch and difference in crystal structure between 111 Si and c-axis hexagonal GaN requires the use of buffer layers in order to grow device quality epitaxial layers. For lateral high electron mobility transistors, these interfacial layers act as a potential source of increased thermal boundary resistance (TBR) which impedes heat flow out of the GaN on Si devices. In addition, these interfacial layers impact the growth and residual stress in the GaN epitaxial layer which can play a role in device reliability. In this work we use optical methods to experimentally measure a relatively low TBR for GaN on Si with an intermediate buffer layer to be 3.8 +/- 0.4 m(2)K/GW. The effective TBR of a material stack that encompasses GaN on Si with a superlattice (SL) buffer is also measured, and is found to be 107 +/- 1 m(2)K/GW. In addition the residual state of strain in the GaN layer is measured for both samples, and is found to vary significantly between them. Thermal conductivity of a 0.8um GaN layer on AlN buffer is determined to be 126 +/- 25 W/m-K, while a 0.84 mu m GaN layer with C-doping on a SL structure is determined to be 112 +/- 29 W/m-K. C1 [Yates, Luke; Bougher, Thomas L.; Cola, Baratunde A.; Graham, Samuel] Georgia Inst Technol, Woodruff Sch Mech Engn, Atlanta, GA 30332 USA. [Beechem, Thomas] Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Yates, L (reprint author), Georgia Inst Technol, Woodruff Sch Mech Engn, Atlanta, GA 30332 USA. NR 22 TC 0 Z9 0 U1 1 U2 1 PU AMER SOC MECHANICAL ENGINEERS PI NEW YORK PA THREE PARK AVENUE, NEW YORK, NY 10016-5990 USA BN 978-0-7918-5690-1 PY 2015 AR V003T04A009 PG 8 WC Thermodynamics; Engineering, Mechanical SC Thermodynamics; Engineering GA BE5WD UT WOS:000373517400015 ER PT S AU Bellum, JC Field, ES Kletecka, DE Rambo, PK Smith, IC AF Bellum, John C. Field, Ella S. Kletecka, Damon E. Rambo, Patrick K. Smith, Ian C. BE Exarhos, GJ Gruzdev, VE Menapace, JA Ristau, D Soileau, MJ TI Design and laser damage properties of a dichroic beam combiner coating for 22.5 degrees incidence and S polarization with high transmission at 527 nm and high reflection at 1054 nm SO LASER-INDUCED DAMAGE IN OPTICAL MATERIALS: 2015 SE Proceedings of SPIE LA English DT Proceedings Paper CT 47th Annual Laser Damage Symposium on Optical Materials for High-Power Lasers CY SEP 27-30, 2015 CL Boulder, CO SP SPIE, Lawrence Livermore Natl Lab, Laser Components GmbH, Spica Technologies Inc, Quantel USA DE Laser damage; dichroic optical coatings; laser beam combining coatings; coatings on large optics ID MULTILAYER DIELECTRIC FILMS; FILTER AB We have designed a dichroic beam combiner coating consisting of 11 HfO2/SiO2 layer pairs deposited on a large fused silica substrate. The coating provides high transmission (HT) at 527 nm and high reflection (HR) at 1054 nm for light at 22.5 degrees angle of incidence (AOI) in air in S polarization (Spol). The coating's design is based on layers of near half-wave optical thickness in the design space for stable HT at 527 nm, with layer modifications that provide HR at 1054 nm while preserving HT at 527 nm. Its implementation in the 527 nm/1054 nm dual wavelength beam combiner arrangement has two options, with each option requiring one or the other of the high intensity beams to be incident on the dichroic coating from within the substrate (from glass). We show that there are differences between the two options with respect to the laser-induced damage threshold (LIDT) properties of the coating, and analyze the differences in terms of the 527 nm and 1054 nm E-field intensity behaviors for air -> coating and glass -> coating incidence. Our E-field analysis indicates that LIDTs for air -> coating incidence should be higher than for glass -> coating incidence. LIDT measurements for Spol at the use AOI with ns pulses at 532 nm and 1064 nm confirm this analysis with the LIDTs for glass -> coating incidence being about half those for air -> coating incidence at both wavelengths. These LIDT results and the E-field analysis clearly indicate that the best beam combiner option is the one for which the high intensity 527 nm beam is incident on the coating from air and the 1054 nm high intensity beam is incident on the coating from glass. C1 [Bellum, John C.; Field, Ella S.; Kletecka, Damon E.; Rambo, Patrick K.; Smith, Ian C.] Sandia Natl Labs, POB 5800,MS 1197, Albuquerque, NM 87185 USA. RP Bellum, JC (reprint author), Sandia Natl Labs, POB 5800,MS 1197, Albuquerque, NM 87185 USA. EM jcbellu@sandia.gov OI Bellum, John/0000-0003-2230-5553 NR 16 TC 4 Z9 4 U1 2 U2 3 PU SPIE-INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA SN 0277-786X BN 978-1-62841-832-3 J9 PROC SPIE PY 2015 VL 9632 AR 96321E DI 10.1117/12.2218166 PG 16 WC Materials Science, Multidisciplinary; Optics; Physics, Applied SC Materials Science; Optics; Physics GA BE5SS UT WOS:000373355700034 ER PT S AU Demos, SG Negres, RA Raman, RN Feit, MD Manes, KR Rubenchik, AM AF Demos, Stavros G. Negres, Raluca A. Raman, Rajesh N. Feit, Michael D. Manes, Kenneth R. Rubenchik, Alexander M. BE Exarhos, GJ Gruzdev, VE Menapace, JA Ristau, D Soileau, MJ TI Morphology of ejected debris from laser super-heated fused silica following exit surface laser-induced damage SO LASER-INDUCED DAMAGE IN OPTICAL MATERIALS: 2015 SE Proceedings of SPIE LA English DT Proceedings Paper CT 47th Annual Laser Damage Symposium on Optical Materials for High-Power Lasers CY SEP 27-30, 2015 CL Boulder, CO SP SPIE, Lawrence Livermore Natl Lab, Laser Components GmbH, Spica Technologies Inc, Quantel USA DE Fused Silica; laser-induced damage; laser superheated material ID ABLATION; DYNAMICS; PHASE; VAPORIZATION; EXPLOSION AB Laser induced damage (breakdown) initiated on the exit surface of transparent dielectric materials using nanosecond pulses creates a volume of superheated material reaching localized temperatures on the order of 1 eV and pressures on the order of 10 GPa or larger. This leads to material ejection and the formation of a crater. The volume of this superheated material depends largely on the laser parameters such as fluence and pulse duration. To elucidate the material behaviors involved, we examined the morphologies of the ejected superheated material particles and found distinctive morphologies. We hypothesize that these morphologies arise from the difference in the structure and physical properties (such as the dynamic viscosity and presence of instabilities) of the superheated material at the time of ejection of each individual particle. Some of the ejected particles are on the order of 1 mu m in diameter and appear as "droplets". Another subgroup appears to have stretched, foam-like structure that can be described as material globules interconnected via smaller in diameter columns. Such particles often contain nanometer size fibers attached on their surface. In other cases, only the globules have been preserved suggesting that they may be associated with a collapsed foam structure under the dynamic pressure as it traverses in air. These distinct features originate in the structure of the superheated material during volume boiling just prior to the ejection of the particles. C1 [Demos, Stavros G.; Negres, Raluca A.; Raman, Rajesh N.; Feit, Michael D.; Manes, Kenneth R.; Rubenchik, Alexander M.] Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. RP Demos, SG (reprint author), Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. EM demos1@llnl.gov NR 19 TC 0 Z9 0 U1 0 U2 0 PU SPIE-INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA SN 0277-786X BN 978-1-62841-832-3 J9 PROC SPIE PY 2015 VL 9632 AR 96320S DI 10.1117/12.2195501 PG 7 WC Materials Science, Multidisciplinary; Optics; Physics, Applied SC Materials Science; Optics; Physics GA BE5SS UT WOS:000373355700017 ER PT S AU Feigenbaum, E Raman, RN Nielsen, N Matthews, MJ AF Feigenbaum, E. Raman, R. N. Nielsen, N. Matthews, M. J. BE Exarhos, GJ Gruzdev, VE Menapace, JA Ristau, D Soileau, MJ TI Light Scattering from Laser-Induced Shallow Pits on Silica Exit Surfaces SO LASER-INDUCED DAMAGE IN OPTICAL MATERIALS: 2015 SE Proceedings of SPIE LA English DT Proceedings Paper CT 47th Annual Laser Damage Symposium on Optical Materials for High-Power Lasers CY SEP 27-30, 2015 CL Boulder, CO SP SPIE, Lawrence Livermore Natl Lab, Laser Components GmbH, Spica Technologies Inc, Quantel USA DE Laser damage; Scattering ID INDUCED DAMAGE SITES; OPTICAL-COMPONENTS; POWER AB We study the formation of laser-induced shallow pits (LSPs) on silica output surfaces and relate these features to optical performance as a function of incident laser fluence. Typical characteristics of the LSPs morphology are presented. Closed-form expressions for the scattered power and far-field angular distribution are derived and validated using numerical calculations of both Fourier optics and FDTD solutions to Maxwell's equations. The model predictions agree well with the measurements for precise profile micro-machined shallow pits on glass, and for pitting caused by laser cleaning of bound metal micro-particles at different fluences. C1 [Feigenbaum, E.; Raman, R. N.; Nielsen, N.; Matthews, M. J.] Lawrence Livermore Natl Lab, Natl Ignit Facil & Photon Sci, 7000 East Ave, Livermore, CA 94550 USA. RP Feigenbaum, E (reprint author), Lawrence Livermore Natl Lab, Natl Ignit Facil & Photon Sci, 7000 East Ave, Livermore, CA 94550 USA. EM eyalf@llnl.gov NR 13 TC 1 Z9 1 U1 0 U2 0 PU SPIE-INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA SN 0277-786X BN 978-1-62841-832-3 J9 PROC SPIE PY 2015 VL 9632 AR 96320H DI 10.1117/12.2195504 PG 8 WC Materials Science, Multidisciplinary; Optics; Physics, Applied SC Materials Science; Optics; Physics GA BE5SS UT WOS:000373355700010 ER PT S AU Field, ES Bellum, JC Kletecka, DE AF Field, Ella S. Bellum, John C. Kletecka, Damon E. BE Exarhos, GJ Gruzdev, VE Menapace, JA Ristau, D Soileau, MJ TI How reduced vacuum pumping capability in a coating chamber affects the laser damage resistance of HfO2/SiO2 antireflection and high reflection coatings SO LASER-INDUCED DAMAGE IN OPTICAL MATERIALS: 2015 SE Proceedings of SPIE LA English DT Proceedings Paper CT 47th Annual Laser Damage Symposium on Optical Materials for High-Power Lasers CY SEP 27-30, 2015 CL Boulder, CO SP SPIE, Lawrence Livermore Natl Lab, Laser Components GmbH, Spica Technologies Inc, Quantel USA ID FEMTOSECOND; DEPOSITION AB Optical coatings with the highest laser damage thresholds rely on clean conditions in the vacuum chamber during the coating deposition process. A low base pressure in the coating chamber, as well as the ability of the vacuum system to maintain the required pressure during deposition, are important aspects of limiting the amount of defects in an optical coating that could induce laser damage. Our large optics coating chamber at Sandia National Laboratories normally relies on three cryo pumps to maintain low pressures for e-beam coating processes. However, on occasion, one or more of the cryo pumps have been out of commission. In light of this circumstance, we decided to explore how deposition under compromised vacuum conditions resulting from the use of only one or two cryo pumps affects the laser-induced damage thresholds of optical coatings. The coatings of this study consist of HfO2 and SiO2 layer materials and include antireflection coatings for 527 nm at normal incidence, and high reflection coatings for 527 nm, 45 degrees angle of incidence (AOI), in P-polarization (P-pol). C1 [Field, Ella S.; Bellum, John C.; Kletecka, Damon E.] Sandia Natl Labs, POB 5800,MS 1191, Albuquerque, NM 87185 USA. RP Field, ES (reprint author), Sandia Natl Labs, POB 5800,MS 1191, Albuquerque, NM 87185 USA. EM efield@sandia.gov NR 14 TC 0 Z9 0 U1 3 U2 3 PU SPIE-INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA SN 0277-786X BN 978-1-62841-832-3 J9 PROC SPIE PY 2015 VL 9632 AR 963219 DI 10.1117/12.2194131 PG 10 WC Materials Science, Multidisciplinary; Optics; Physics, Applied SC Materials Science; Optics; Physics GA BE5SS UT WOS:000373355700030 ER PT S AU Kafka, KRP Chowdhury, EA Negres, RA Stolz, CJ Bude, JD Bayramian, AJ Marshall, CD Spinka, TM Haefner, CL AF Kafka, K. R. P. Chowdhury, E. A. Negres, R. A. Stolz, C. J. Bude, J. D. Bayramian, A. J. Marshall, C. D. Spinka, T. M. Haefner, C. L. BE Exarhos, GJ Gruzdev, VE Menapace, JA Ristau, D Soileau, MJ TI Test station development for laser-induced optical damage performance of broadband multilayer dielectric coatings SO LASER-INDUCED DAMAGE IN OPTICAL MATERIALS: 2015 SE Proceedings of SPIE LA English DT Proceedings Paper CT 47th Annual Laser Damage Symposium on Optical Materials for High-Power Lasers CY SEP 27-30, 2015 CL Boulder, CO SP SPIE, Lawrence Livermore Natl Lab, Laser Components GmbH, Spica Technologies Inc, Quantel USA DE Laser induced damage; optical coatings; high power laser; Multi-layer Dielectric coating; Laser ablation AB Laser-induced damage threshold (LIDT) testing was performed on commercially-available multilayer dielectric coatings to qualify for use in the High Repetition-Rate Advanced Petawatt Laser System (HAPLS) for Extreme Light Infrastructure Beamlines. Various tests were performed with uncompressed pulses (150 ps) from a 780 nm-centered Ti:Sapphire regenerative ampliflier, and the raster scan method was used to determine the best-performing coatings. Performance varied from 28 J/cm(2) across samples from 6 different manufacturers. C1 [Kafka, K. R. P.; Chowdhury, E. A.] Ohio State Univ, Dept Phys, 191 W Woodruff Ave, Columbus, OH 43210 USA. [Negres, R. A.; Stolz, C. J.; Bude, J. D.; Bayramian, A. J.; Marshall, C. D.; Spinka, T. M.; Haefner, C. L.] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Kafka, KRP (reprint author), Ohio State Univ, Dept Phys, 191 W Woodruff Ave, Columbus, OH 43210 USA. NR 4 TC 3 Z9 3 U1 1 U2 4 PU SPIE-INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA SN 0277-786X BN 978-1-62841-832-3 J9 PROC SPIE PY 2015 VL 9632 AR 96321C DI 10.1117/12.2195786 PG 8 WC Materials Science, Multidisciplinary; Optics; Physics, Applied SC Materials Science; Optics; Physics GA BE5SS UT WOS:000373355700032 ER PT S AU Liao, ZM Nostrand, M Whitman, P Bude, J AF Liao, Z. M. Nostrand, M. Whitman, P. Bude, J. BE Exarhos, GJ Gruzdev, VE Menapace, JA Ristau, D Soileau, MJ TI Analysis of optics damage growth at the National Ignition Facility SO LASER-INDUCED DAMAGE IN OPTICAL MATERIALS: 2015 SE Proceedings of SPIE LA English DT Proceedings Paper CT 47th Annual Laser Damage Symposium on Optical Materials for High-Power Lasers CY SEP 27-30, 2015 CL Boulder, CO SP SPIE, Lawrence Livermore Natl Lab, Laser Components GmbH, Spica Technologies Inc, Quantel USA DE Laser-induced optics damage; optics lifetime ID FUSED-SILICA OPTICS; NS LASER IRRADIATION; EXIT SURFACE; NIF; UV AB Optics damage growth modeling and analysis at the National Ignition Facility (NIF) has been performed on fused silica. We will show the results of single shot growth comparisons, damage site lifetime comparisons as well as growth metrics for each individual NIF beamline. These results help validate the consistency of the damage growth models and allow us to have confidence in our strategic planning in regards to projected optic usage. C1 [Liao, Z. M.; Nostrand, M.; Whitman, P.; Bude, J.] Lawrence Livermore Natl Lab, 7000 East Ave,POB 808, Livermore, CA 94551 USA. RP Liao, ZM (reprint author), Lawrence Livermore Natl Lab, 7000 East Ave,POB 808, Livermore, CA 94551 USA. NR 23 TC 2 Z9 2 U1 2 U2 3 PU SPIE-INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA SN 0277-786X BN 978-1-62841-832-3 J9 PROC SPIE PY 2015 VL 9632 AR 963217 DI 10.1117/12.2195515 PG 7 WC Materials Science, Multidisciplinary; Optics; Physics, Applied SC Materials Science; Optics; Physics GA BE5SS UT WOS:000373355700028 ER PT S AU Ly, S Laurence, TA Shen, N Hollingsworth, B Norton, M Bude, JD AF Ly, Sonny Laurence, Ted A. Shen, Nan Hollingsworth, Bill Norton, Mary Bude, Jeff D. BE Exarhos, GJ Gruzdev, VE Menapace, JA Ristau, D Soileau, MJ TI Multipulse degradation of fused silica surfaces at 351 nm SO LASER-INDUCED DAMAGE IN OPTICAL MATERIALS: 2015 SE Proceedings of SPIE LA English DT Proceedings Paper CT 47th Annual Laser Damage Symposium on Optical Materials for High-Power Lasers CY SEP 27-30, 2015 CL Boulder, CO SP SPIE, Lawrence Livermore Natl Lab, Laser Components GmbH, Spica Technologies Inc, Quantel USA AB We investigate the multipulse degradation of fused silica surfaces exposed at 351 nm for up to 10(9) pulses at pulse fluences greater than 10 J/cm(2). In vacuum, the transmission loss increases as a function of the number of shots at low pulse intensity. However, as the pulse intensity increases, the transmission loss decreases and is not measureable above a certain intensity. Transmission loss is highest when measured at shorter wavelengths, and decreases towards the IR. Absorption is the primary mechanism that leads to transmission loss and is from photo-reduction of the silica surface. C1 [Ly, Sonny; Laurence, Ted A.; Shen, Nan; Bude, Jeff D.] Lawrence Livermore Natl Lab, Phys & Life Sci, 7000 East Ave, Livermore, CA 94550 USA. [Ly, Sonny; Laurence, Ted A.; Shen, Nan; Hollingsworth, Bill; Norton, Mary; Bude, Jeff D.] Lawrence Livermore Natl Lab, NIF & Photon Sci, Livermore, CA 94550 USA. RP Ly, S (reprint author), Lawrence Livermore Natl Lab, Phys & Life Sci, 7000 East Ave, Livermore, CA 94550 USA. EM ly2@llnl.gov NR 9 TC 0 Z9 0 U1 0 U2 0 PU SPIE-INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA SN 0277-786X BN 978-1-62841-832-3 J9 PROC SPIE PY 2015 VL 9632 AR 96320T DI 10.1117/12.2195595 PG 5 WC Materials Science, Multidisciplinary; Optics; Physics, Applied SC Materials Science; Optics; Physics GA BE5SS UT WOS:000373355700018 ER PT S AU Negres, RA Carr, CW Bass, IL Alessi, DA Laurence, TA Stanion, K Guss, G Cross, DA Wegner, PJ Stolz, CJ AF Negres, Raluca A. Carr, Christopher W. Bass, Isaac L. Alessi, David A. Laurence, Ted A. Stanion, Ken Guss, Gabe Cross, David A. Wegner, Paul J. Stolz, Christopher J. BE Exarhos, GJ Gruzdev, VE Menapace, JA Ristau, D Soileau, MJ TI Characterization of laser-induced damage by picosecond pulses on multi-layer dielectric coatings for petawatt-class lasers SO LASER-INDUCED DAMAGE IN OPTICAL MATERIALS: 2015 SE Proceedings of SPIE LA English DT Proceedings Paper CT 47th Annual Laser Damage Symposium on Optical Materials for High-Power Lasers CY SEP 27-30, 2015 CL Boulder, CO SP SPIE, Lawrence Livermore Natl Lab, Laser Components GmbH, Spica Technologies Inc, Quantel USA DE Laser-induced damage; multi-layer dielectric coatings; coating defects; picosecond pulses; petawatt lasers; pulsed laser-matter interactions ID ACCELERATORS; BEHAVIOR AB We investigate the optical damage performance of multi-layer dielectric (MLD) coatings suitable for use in high energy, large-aperture petawatt-class lasers. We employ small-area damage test methodologies to evaluate the damage resistance of various coatings as a function of deposition methods and coating materials under simulated use conditions. In addition, we demonstrate that damage initiation by raster scanning at lower fluences and growth threshold testing are required to estimate large-aperture optics' performance. C1 [Negres, Raluca A.; Carr, Christopher W.; Bass, Isaac L.; Alessi, David A.; Laurence, Ted A.; Stanion, Ken; Guss, Gabe; Cross, David A.; Wegner, Paul J.; Stolz, Christopher J.] Lawrence Livermore Natl Lab, 7000 East Ave, Livermore, CA 94550 USA. RP Negres, RA (reprint author), Lawrence Livermore Natl Lab, 7000 East Ave, Livermore, CA 94550 USA. EM negres2@llnl.gov NR 29 TC 3 Z9 3 U1 1 U2 3 PU SPIE-INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA SN 0277-786X BN 978-1-62841-832-3 J9 PROC SPIE PY 2015 VL 9632 AR 963206 DI 10.1117/12.2195528 PG 9 WC Materials Science, Multidisciplinary; Optics; Physics, Applied SC Materials Science; Optics; Physics GA BE5SS UT WOS:000373355700003 ER PT S AU Qiu, SR Norton, MA Honig, J Rubenchik, AM Boley, CD Rigatti, A Stolz, CJ Matthews, MJ AF Qiu, S. R. Norton, M. A. Honig, J. Rubenchik, A. M. Boley, C. D. Rigatti, A. Stolz, C. J. Matthews, M. J. BE Exarhos, GJ Gruzdev, VE Menapace, JA Ristau, D Soileau, MJ TI Impact of particle shape on the laser-contaminant interaction induced damage on the protective capping layer of 1 omega high reflector mirror coatings SO LASER-INDUCED DAMAGE IN OPTICAL MATERIALS: 2015 SE Proceedings of SPIE LA English DT Proceedings Paper CT 47th Annual Laser Damage Symposium on Optical Materials for High-Power Lasers CY SEP 27-30, 2015 CL Boulder, CO SP SPIE, Lawrence Livermore Natl Lab, Laser Components GmbH, Spica Technologies Inc, Quantel USA DE Protective coating layer; High reflector; Multilayer coatings; Laser damage; Plasmas; 1 omega; 1064 nm; High peak power laser ID OPTICAL COATINGS AB We report an investigation on the response to laser exposure of a protective capping layer of 1 omega (1053 nm) high-reflector mirror coatings, in the presence of differently shaped Ti particles. We consider two candidate capping layer materials, namely SiO2 and Al2O3. They are coated over multiple silica-hafnia multilayer coatings. Each sample is exposed to a single oblique (45 degrees) shot of a 1053 nm laser beam (p polarization, fluence similar to 10 J/cm(2), pulse length 14 ns), in the presence of spherically or irregularly shaped Ti particles on the surface. We observe that the two capping layers show markedly different responses. For spherically shaped particles, the Al2O3 cap layer exhibits severe damage, with the capping layer becoming completely delaminated at the particle locations. In contrast, the SiO2 capping layer is only mildly modified by a shallow depression, likely due to plasma erosion. For irregularly shaped Ti filings, the Al2O3 capping layer displays minimal to no damage while the SiO2 capping layer is significantly damaged. In the case of the spherical particles, we attribute the different response of the capping layer to the large difference in thermal expansion coefficient of the materials, with that of the Al2O3 about 15 times greater than that of the SiO2 layer. For the irregularly shaped filings, we attribute the difference in damage response to the large difference in mechanical toughness between the two materials, with that of the Al2O3 being about 10 times stronger than that of the SiO2. C1 [Qiu, S. R.; Norton, M. A.; Honig, J.; Rubenchik, A. M.; Boley, C. D.; Stolz, C. J.; Matthews, M. J.] Lawrence Livermore Natl Lab, 7000 East Ave, Livermore, CA 94551 USA. [Rigatti, A.] Univ Rochester, Laser Energet Lab, Rochester, NY 14623 USA. RP Qiu, SR (reprint author), Lawrence Livermore Natl Lab, 7000 East Ave, Livermore, CA 94551 USA. EM qiu2@llnl.gov NR 19 TC 0 Z9 0 U1 3 U2 3 PU SPIE-INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA SN 0277-786X BN 978-1-62841-832-3 J9 PROC SPIE PY 2015 VL 9632 AR 963208 DI 10.1117/12.2195517 PG 9 WC Materials Science, Multidisciplinary; Optics; Physics, Applied SC Materials Science; Optics; Physics GA BE5SS UT WOS:000373355700004 ER PT S AU Shen, N Demos, SG Negres, RA Rubenchik, AM Harris, CD Matthews, MJ AF Shen, Nan Demos, Stavros G. Negres, Raluca A. Rubenchik, Alexander M. Harris, Candace D. Matthews, Manyalibo J. BE Exarhos, GJ Gruzdev, VE Menapace, JA Ristau, D Soileau, MJ TI Energetic laser cleaning of metallic particles and surface damage on silica optics: Investigation of the underlying mechanisms SO LASER-INDUCED DAMAGE IN OPTICAL MATERIALS: 2015 SE Proceedings of SPIE LA English DT Proceedings Paper CT 47th Annual Laser Damage Symposium on Optical Materials for High-Power Lasers CY SEP 27-30, 2015 CL Boulder, CO SP SPIE, Lawrence Livermore Natl Lab, Laser Components GmbH, Spica Technologies Inc, Quantel USA ID INDUCED BREAKDOWN SPECTROSCOPY; REMOVAL; TEMPERATURE; IRRADIATION; EVOLUTION; CONTINUUM; ABLATION; PLASMAS; MODEL AB Surface particulate contamination on optics can lead to laser-induced damage hence limit the performance of high power laser system. In this work we focus on understanding the fundamental mechanisms that lead to damage initiation by metal contaminants. Using time resolved microscopy and plasma spectroscopy, we studied the dynamic process of ejecting similar to 30 mu m stainless steel particles from the exit surface of fused silica substrate irradiated with 1064 nm, 10 ns and 355 nm, 8 ns laser pulses. Time-resolved plasma emission spectroscopy was used to characterize the energy coupling and temperature rise associated with single, 10-ns pulsed laser ablation of metallic particles bound to transparent substrates. Plasma associated with Fe(I) emission lines originating from steel microspheres was observe to cool from > 24,000 K to similar to 15,000 K over similar to 220 ns as tau(-0.22), consistent with radiative losses and adiabatic gas expansion of a relatively free plasma. Simultaneous emission lines from Si(II) associated with the plasma etching of the SiO2 substrate were observed yielding higher plasma temperatures, similar to 35,000 K, relative to the Fe(I) plasma. The difference in species temperatures is consistent with plasma confinement at the microsphere-substrate interface as the particle is ejected, and is directly visualized using pump-probe shadowgraphy as a function of pulsed laser energy. C1 [Shen, Nan; Demos, Stavros G.; Negres, Raluca A.; Rubenchik, Alexander M.; Harris, Candace D.; Matthews, Manyalibo J.] Lawrence Livermore Natl Lab, 7000 East Ave, Livermore, CA 94550 USA. RP Shen, N (reprint author), Lawrence Livermore Natl Lab, 7000 East Ave, Livermore, CA 94550 USA. EM nshen@llnl.gov NR 30 TC 0 Z9 0 U1 2 U2 4 PU SPIE-INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA SN 0277-786X BN 978-1-62841-832-3 J9 PROC SPIE PY 2015 VL 9632 AR 96320V DI 10.1117/12.2195593 PG 11 WC Materials Science, Multidisciplinary; Optics; Physics, Applied SC Materials Science; Optics; Physics GA BE5SS UT WOS:000373355700019 ER PT S AU Stolz, CJ Negres, RA Kafka, K Chowdhury, E Kirchner, M Shea, K Daly, M AF Stolz, Christopher J. Negres, Raluca A. Kafka, Kyle Chowdhury, Enam Kirchner, Matt Shea, Kevin Daly, Meaghan BE Exarhos, GJ Gruzdev, VE Menapace, JA Ristau, D Soileau, MJ TI 150-ps broadband low dispersion mirror thin film damage competition SO LASER-INDUCED DAMAGE IN OPTICAL MATERIALS: 2015 SE Proceedings of SPIE LA English DT Proceedings Paper CT 47th Annual Laser Damage Symposium on Optical Materials for High-Power Lasers CY SEP 27-30, 2015 CL Boulder, CO SP SPIE, Lawrence Livermore Natl Lab, Laser Components GmbH, Spica Technologies Inc, Quantel USA DE laser damage; laser damage testing; thin film; broadband low dispersion mirror; multilayer; picosecond pulse length AB Broadband low dispersion mirrors are fluence-limiting and pulse-shape-limiting components in short pulse lasers. To better understand the current technology state of broadband low dispersion mirrors, a laser damage competition was held at the 2015 Laser Damage Conference. Participants were asked to submit mirrors that met a minimum reflection of 99.5% at 45 degrees incidence angle at "P" polarization with a Group Dispersion Delay (GDD) of <+/- 100 fs(2) over a spectral range of 773 nm +/- 50 nm. The participants selected the coating materials, design, and deposition method. Laser damage testing was performed using the raster scan method with a 150 ps pulse length on a single testing facility to enable a direct comparison among the participants. GDD measurements were performed to validate specification compliance. Unfortunately nearly half of the submitted samples were found to not meet the GDD specifications. Details of the deposition processes, cleaning method, coating materials, and layer count are also shared. C1 [Stolz, Christopher J.; Negres, Raluca A.] Lawrence Livermore Natl Lab, 7000 East Ave,L-460, Livermore, CA 94550 USA. [Kafka, Kyle; Chowdhury, Enam] Ohio State Univ, Columbus, OH 43210 USA. [Kirchner, Matt; Shea, Kevin; Daly, Meaghan] KMLabs, Boulder, CO 80301 USA. RP Stolz, CJ (reprint author), Lawrence Livermore Natl Lab, 7000 East Ave,L-460, Livermore, CA 94550 USA. NR 10 TC 2 Z9 2 U1 1 U2 1 PU SPIE-INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA SN 0277-786X BN 978-1-62841-832-3 J9 PROC SPIE PY 2015 VL 9632 AR 96320C DI 10.1117/12.2195592 PG 8 WC Materials Science, Multidisciplinary; Optics; Physics, Applied SC Materials Science; Optics; Physics GA BE5SS UT WOS:000373355700006 ER PT S AU Xu, YJ Khabbazi, A Day, T Brown, A Emmert, LA Talghader, JJ Field, E Kletecka, D Bellum, J Patel, D Menoni, CS Rudolph, W AF Xu, Yejia Khabbazi, Amir Day, Travis Brown, Andrew Emmert, Luke A. Talghader, Joseph J. Field, Ella Kletecka, Damon Bellum, John Patel, Dinesh Menoni, Carmen S. Rudolph, Wolfgang BE Exarhos, GJ Gruzdev, VE Menapace, JA Ristau, D Soileau, MJ TI Comparative STEREO-LID (Spatio-TEmporally REsolved Optical Laser-Induced Damage) studies of critical defect distributions in IBS, ALD, and electron-beam coated dielectric films SO LASER-INDUCED DAMAGE IN OPTICAL MATERIALS: 2015 SE Proceedings of SPIE LA English DT Proceedings Paper CT 47th Annual Laser Damage Symposium on Optical Materials for High-Power Lasers CY SEP 27-30, 2015 CL Boulder, CO SP SPIE, Lawrence Livermore Natl Lab, Laser Components GmbH, Spica Technologies Inc, Quantel USA DE laser-induced damage threshold; optical coatings; defect distribution ID FUSED-SILICA; THIN-FILM; 1064 NM; SURFACE; PRECURSORS; DEPOSITION; PULSES; BULK AB The laser damage behavior of high quality coatings under nanosecond pulse illumination is controlled by statistically distributed defects, whose physical nature and defect mechanisms are still largely unknown. Defect densities are often retrieved by modeling the fluence dependence of the damage probability measured by traditional damage test (TDT) methods, based on 'damage' or 'no damage' observations. STEREO-LID (Spatio-TEmporally REsolved Optical Laser-Induced Damage) allows the determination of the damage fluence (and intensity) in a single test by identifying the initiation of damage both temporally and spatially. The advantages of this test method over the TDT are discussed. In particular, its ability to retrieve detailed defect distribution functions is demonstrated by comparison of results from HfO2 films prepared by ion-assisted electron beam evaporation, ion-beam sputtering, and atomic layer deposition. C1 [Xu, Yejia; Khabbazi, Amir; Emmert, Luke A.; Rudolph, Wolfgang] Univ New Mexico, Dept Phys & Astron, Albuquerque, NM 87131 USA. [Brown, Andrew; Talghader, Joseph J.] Univ Minnesota, Dept Elect & Comp Engn, Minneapolis, MN 55455 USA. [Field, Ella; Kletecka, Damon; Bellum, John] Sandia Natl Labs, Albuquerque, NM 87185 USA. [Day, Travis; Patel, Dinesh; Menoni, Carmen S.] Colorado State Univ, Dept Elect & Comp Engn, Ft Collins, CO 80523 USA. RP Rudolph, W (reprint author), Univ New Mexico, Dept Phys & Astron, Albuquerque, NM 87131 USA. EM wrudolph@unm.edu NR 23 TC 0 Z9 0 U1 1 U2 1 PU SPIE-INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA SN 0277-786X BN 978-1-62841-832-3 J9 PROC SPIE PY 2015 VL 9632 AR 963215 DI 10.1117/12.2196548 PG 9 WC Materials Science, Multidisciplinary; Optics; Physics, Applied SC Materials Science; Optics; Physics GA BE5SS UT WOS:000373355700026 ER PT J AU Miner, NE Gauthier, JH Wilson, ML Le, HD Kao, GK Melander, DJ Longsine, DE AF Miner, Nadine E. Gauthier, John H. Wilson, Michael L. Le, Hai D. Kao, Gio K. Melander, Darryl J. Longsine, Dennis E. TI Measuring the Adaptability of Systems of Systems SO MILITARY OPERATIONS RESEARCH LA English DT Article ID ADAPTATION AB Our society is increasingly reliant on systems and interoperating collections of systems, known as systems of systems (SoS). Our national security is built on SoS, such as Army brigades, airport security, and nuclear weapons security. These SoS are often subject to changing budgets, changing missions (e.g., nation building, arms-control treaties), changing threats (e.g., asymmetric warfare, terrorism, WMDs), and changing natural environments (e.g., climate, weather, natural disasters). Can vital SoS adapt to these changing landscapes effectively and efficiently? This paper describes research at Sandia National Laboratories to develop metrics for measuring the adaptability of SoS. We report that we could not find a single or absolute adaptability metric, in large part due to lack of general objectives or structures of SoS. However, we do report a set of metrics that can be applied relatively, plus a method for combining the metrics into an adaptability index, a single value that can be used to compare SoS designs. We show in a test case that these metrics can distinguish good and poor performance under a variable mission space and an uncertain threat environment. The metrics are intended to support a long-range goal of creating an analytic capability to assist in the design and operation of adaptable systems and SoS. C1 [Miner, Nadine E.; Gauthier, John H.; Wilson, Michael L.; Le, Hai D.; Kao, Gio K.; Melander, Darryl J.] Sandia Natl Labs, Livermore, CA 94550 USA. [Longsine, Dennis E.] Intera Inc, Austin, TX USA. RP Miner, NE (reprint author), Sandia Natl Labs, Livermore, CA 94550 USA. FU Sandia National Laboratories under Laboratory Directed Research and Development (LDRD) [158767]; United States Department of Energy's National Nuclear Security Administration [DE-AC04-94AL85000] FX This work was funded by Sandia National Laboratories under Laboratory Directed Research and Development (LDRD) 158767, and the methodology is covered by provisional patents USPTO 61/894,208 and 61/894,251. Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the United States Department of Energy's National Nuclear Security Administration under contract DE-AC04-94AL85000. NR 31 TC 0 Z9 0 U1 5 U2 5 PU MILITARY OPERATIONS RESEARCH SOC PI ALEXANDRIA PA 1703 N BEAUREGARD ST, STE 450, ALEXANDRIA, VA 22311-1717 USA SN 0275-5823 J9 MIL OPER RES JI Mil. Oper. Res. PY 2015 VL 20 IS 3 BP 25 EP 37 DI 10.5711/1082598320325 PG 13 WC Operations Research & Management Science SC Operations Research & Management Science GA DI6YW UT WOS:000373647100002 ER PT J AU McBride, JC Zhao, XP Munro, NB Jicha, GA Schmitt, FA Kryscio, RJ Smith, CD Jiang, Y AF McBride, Joseph C. Zhao, Xiaopeng Munro, Nancy B. Jicha, Gregory A. Schmitt, Frederick A. Kryscio, Richard J. Smith, Charles D. Jiang, Yang TI Sugihara causality analysis of scalp EEG for detection of early Alzheimer's disease SO NEUROIMAGE-CLINICAL LA English DT Article DE Early Alzheimer's disease; Mild cognitive impairment; EEG-based diagnosis; Causality analysis ID MILD COGNITIVE IMPAIRMENT; SPECTRAL-ANALYSIS; ASSOCIATION WORKGROUPS; DIAGNOSTIC GUIDELINES; NATIONAL INSTITUTE; EARLY-STAGE; SYNCHRONIZATION; RECOMMENDATIONS; ARTIFACTS; NETWORKS AB Recently, Sugihara proposed an innovative causality concept, which, in contrast to statistical predictability in Granger sense, characterizes underlying deterministic causation of the system. This work exploits Sugihara causality analysis to develop novel EEC biomarkers for discriminating normal aging from mild cognitive impairment (MCI) and early Alzheimer's disease (AD). The hypothesis of this work is that scalp EEG based causality measurements have different distributions for different cognitive groups and hence the causality measurements can be used to distinguish between NC, MCI, and AD participants. The current results are based on 30-channel resting EEG records from 48 age-matched participants (mean age 75.7 years) 15 normal controls (NCs), 16 MCI, and 17 early-stage AD. First, a reconstruction model is developed for each EEG channel, which predicts the signal in the current channel using data of the other 29 channels. The reconstruction model of the target channel is trained using NC, MCI, or AD records to generate an NC-, MCI-, or AD-specific model, respectively. To avoid over fitting, the training is based on the leave-one-out principle. Sugihara causality between the channels is described by a quality score based on comparison between the reconstructed signal and the original signal. The quality scores are studied for their potential as biomarkers to distinguish between the different cognitive groups. First, the dimension of the quality scores is reduced to two principal components. Then, a three-way classification based on the principal components is conducted. Accuracies of 95.8%, 95.8%, and 97.9% are achieved for resting eyes open, counting eyes closed, and resting eyes closed protocols, respectively. This work presents a novel application of Sugihara causality analysis to capture characteristic changes in EEC activity due to cognitive deficits. The developed method has excellent potential as individualized biomarkers in the detection of pathophysiological changes in early-stage AD. (C) 2014 The Authors. Published by Elsevier Inc. C1 [McBride, Joseph C.; Zhao, Xiaopeng] Dept Mech Aerosp & Biomed Engn, Knoxville, TN 37996 USA. [Zhao, Xiaopeng] Univ Tennessee, Natl Inst Math & Biol Synth, Knoxville, TN 37996 USA. [Munro, Nancy B.] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. [Jicha, Gregory A.; Schmitt, Frederick A.; Kryscio, Richard J.; Smith, Charles D.; Jiang, Yang] Univ Kentucky, Coll Med, Sanders Brown Ctr Aging, Lexington, KY 40356 USA. [Jicha, Gregory A.; Schmitt, Frederick A.; Smith, Charles D.] Univ Kentucky, Dept Neurol, Coll Med, Lexington, KY 40356 USA. [Kryscio, Richard J.] Univ Kentucky, Dept Stat, Coll Med, Lexington, KY 40356 USA. [Jiang, Yang] Univ Kentucky, Dept Behav Sci, Coll Med, Lexington, KY 40356 USA. RP Zhao, XP (reprint author), Univ Tennessee, Dept Mech Aerosp & Biomed Engn, Knoxville, TN 37996 USA. EM xzhao9@utk.edu FU Laboratory Directed Research and Development Program of Oak Ridge National Laboratory [DE-AC05-00OR22725]; NSF [CMMI-0845753, CMMI-1234155]; NIH [NIH P30 AG028383, NIH AG00986, NIH NCRR UL1TR000117] FX Research was sponsored in part by the L aboratory Directed Research and Development Program of Oak Ridge National Laboratory, managed by UT-Battelle, LLC, for the US Department of Energy under Contract No. DE-AC05-00OR22725; by the NSF under grant numbers CMMI-0845753 and CMMI-1234155; and in part by the NIH under grants NIH P30 AG028383 to the UK Sanders-Brown Center on Aging, NIH AG00986 to YJ, and NIH NCRR UL1TR000117 to the UK Center for Clinical and Translational Science. The contribution to this paper by N.B. Munro was prepared while acting in her own independent capacities and not on behalf of UT-Battelle, LLC, or its affiliates or successors, or Oak Ridge National Laboratory, or the US Department of Energy. We deeply thank Dr. David Wekstein of the UK Alzheimer's Research Center for his key role in getting the collaboration between ORNL and UK in place to make the pilot study possible. We thank A. Lawson, E. Walsh, J. Lianekhammy, S. Kaiser, C. Black, K. Tran, and L. Broster at the University of Kentucky for their assistance in data acquisition and database management, and E. Abner at the Biostatistics Core at the UK Aging Center for providing the mini-mental state examination scores of some participants. NR 42 TC 6 Z9 6 U1 3 U2 6 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND SN 2213-1582 J9 NEUROIMAGE-CLIN JI NeuroImage-Clin. PY 2015 VL 7 BP 258 EP 265 DI 10.1016/j.nicl.2014.12.005 PG 8 WC Neuroimaging SC Neurosciences & Neurology GA DI0GE UT WOS:000373172600029 PM 25610788 ER PT S AU Zhang, ZC Zhang, SS AF Zhang, Zhengcheng Zhang, Sheng Shui BE Zhang, Z Zhang, SS TI Challenges of Key Materials for Rechargeable Batteries SO RECHARGEABLE BATTERIES: MATERIALS, TECHNOLOGIES AND NEW TRENDS SE Green Energy and Technology LA English DT Article; Book Chapter ID LITHIUM-ION BATTERIES; LIQUID ELECTROLYTE; CATHODE MATERIAL; ELECTROCHEMICAL PERFORMANCE; COMPOSITE ELECTRODES; INSERTION MATERIAL; SPINEL CATHODES; ANODE MATERIALS; CHEMISTRY; STABILITY C1 [Zhang, Zhengcheng] Argonne Natl Lab, Chem Sci & Engn Div, Lemont, IL 60439 USA. [Zhang, Sheng Shui] US Army Res Lab, Electrochem Branch, RDRL SED C, Sensors & Electron Devices Directorate, Adelphi, MD 20783 USA. RP Zhang, SS (reprint author), US Army Res Lab, Electrochem Branch, RDRL SED C, Sensors & Electron Devices Directorate, Adelphi, MD 20783 USA. EM zzhang@anl.gov; shengshui.zhang.civ@mail.mil NR 49 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER PI NEW YORK PA 233 SPRING STREET, NEW YORK, NY 10013, UNITED STATES SN 1865-3529 BN 978-3-319-15458-9; 978-3-319-15457-2 J9 GREEN ENERGY TECHNOL PY 2015 BP 1 EP 24 DI 10.1007/978-3-319-15458-9_1 D2 10.1007/978-3-319-15458-9 PG 24 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE4HR UT WOS:000371733200002 ER PT S AU Zhang, ZC Zhang, SS AF Zhang, Zhengcheng Zhang, Sheng Shui BE Zhang, Z Zhang, SS TI Rechargeable Batteries Materials, Technologies and New Trends Preface SO RECHARGEABLE BATTERIES: MATERIALS, TECHNOLOGIES AND NEW TRENDS SE Green Energy and Technology LA English DT Editorial Material; Book Chapter C1 [Zhang, Zhengcheng] Argonne Natl Lab, Chem Sci & Engn Div, Lemont, IL USA. [Zhang, Sheng Shui] US Army Res Lab, Sensors & Electron Devices Directorate, Adelphi, MD USA. RP Zhang, ZC (reprint author), Argonne Natl Lab, Chem Sci & Engn Div, Lemont, IL USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER PI NEW YORK PA 233 SPRING STREET, NEW YORK, NY 10013, UNITED STATES SN 1865-3529 BN 978-3-319-15458-9; 978-3-319-15457-2 J9 GREEN ENERGY TECHNOL PY 2015 BP V EP VI D2 10.1007/978-3-319-15458-9 PG 2 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE4HR UT WOS:000371733200001 ER PT S AU Hu, LB Zhang, SS Zhang, ZC AF Hu, Libo Zhang, Sheng Shui Zhang, Zhengcheng BE Zhang, Z Zhang, SS TI Electrolytes for Lithium and Lithium-Ion Batteries SO RECHARGEABLE BATTERIES: MATERIALS, TECHNOLOGIES AND NEW TRENDS SE Green Energy and Technology LA English DT Article; Book Chapter ID VOLTAGE SPINEL LINI0.5MN1.5O4; CARBONATE-BASED ELECTROLYTES; SULFONE-BASED ELECTROLYTES; ORGANO-FLUORINE COMPOUNDS; GAMMA-BUTYROLACTONE; POLYMER ELECTROLYTES; ELECTROCHEMICAL PROPERTIES; FLUOROETHYLENE CARBONATE; PROPYLENE CARBONATE; ELEVATED-TEMPERATURE C1 [Hu, Libo; Zhang, Zhengcheng] Argonne Natl Lab, Chem Sci & Engn Div, Electrochem Energy Storage Theme, Lemont, IL 60439 USA. [Zhang, Sheng Shui] US Army Res Lab, Adelphi, MD 20783 USA. RP Zhang, ZC (reprint author), Argonne Natl Lab, Chem Sci & Engn Div, Electrochem Energy Storage Theme, Lemont, IL 60439 USA. EM Shengshui.zhang.civ@mail.mil; zzhang@anl.gov NR 142 TC 0 Z9 0 U1 2 U2 2 PU SPRINGER PI NEW YORK PA 233 SPRING STREET, NEW YORK, NY 10013, UNITED STATES SN 1865-3529 BN 978-3-319-15458-9; 978-3-319-15457-2 J9 GREEN ENERGY TECHNOL PY 2015 BP 231 EP 261 DI 10.1007/978-3-319-15458-9_8 D2 10.1007/978-3-319-15458-9 PG 31 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE4HR UT WOS:000371733200009 ER PT S AU Hu, LB Tornheim, A Zhang, SS Zhang, ZC AF Hu, Libo Tornheim, Adam Zhang, Sheng Shui Zhang, Zhengcheng BE Zhang, Z Zhang, SS TI Additives for Functional Electrolytes of Li-Ion Batteries SO RECHARGEABLE BATTERIES: MATERIALS, TECHNOLOGIES AND NEW TRENDS SE Green Energy and Technology LA English DT Article; Book Chapter ID HIGH-VOLTAGE SPINEL; LITHIUM BIS(OXALATO) BORATE; TRIS PENTAFLUOROPHENYL PHOSPHINE; CARBONATE-BASED ELECTROLYTE; ENHANCED THERMAL-STABILITY; FLAME-RETARDANT ADDITIVES; CRESYL DIPHENYL PHOSPHATE; VINYL ETHYLENE CARBONATE; REDOX SHUTTLE ADDITIVES; SURFACE-FILM FORMATION C1 [Hu, Libo; Tornheim, Adam; Zhang, Zhengcheng] Argonne Natl Lab, Chem Sci & Engn Div, Electrochem Energy Storage Theme, Lemont, IL 60439 USA. [Zhang, Sheng Shui] US Army Res Lab, Adelphi, MD 20783 USA. RP Zhang, ZC (reprint author), Argonne Natl Lab, Chem Sci & Engn Div, Electrochem Energy Storage Theme, Lemont, IL 60439 USA. EM Shengshui.zhang.civ@mail.mil; zzhang@anl.gov NR 177 TC 0 Z9 0 U1 1 U2 2 PU SPRINGER PI NEW YORK PA 233 SPRING STREET, NEW YORK, NY 10013, UNITED STATES SN 1865-3529 BN 978-3-319-15458-9; 978-3-319-15457-2 J9 GREEN ENERGY TECHNOL PY 2015 BP 263 EP 290 DI 10.1007/978-3-319-15458-9_9 D2 10.1007/978-3-319-15458-9 PG 28 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE4HR UT WOS:000371733200010 ER PT S AU Xue, Z Zhang, ZC Zhang, SS AF Xue, Zheng Zhang, Zhengcheng Zhang, Sheng Shui BE Zhang, Z Zhang, SS TI Manufacture and Surface Modification of Polyolefin Separator SO RECHARGEABLE BATTERIES: MATERIALS, TECHNOLOGIES AND NEW TRENDS SE Green Energy and Technology LA English DT Article; Book Chapter ID MELT-EXTRUSION PROCESS; LITHIUM-ION BATTERIES; MICROPOROUS MEMBRANES; POLYMER ELECTROLYTE; COATED SEPARATORS; RESIN VARIABLES; GEL POLYMER; PERFORMANCE; POLYOXYMETHYLENE; CELLS C1 [Xue, Zheng; Zhang, Zhengcheng] Argonne Natl Lab, Chem Sci & Engn Div, Lemont, IL 60439 USA. [Zhang, Sheng Shui] US Army Res Lab, Electrochem Branch, RDRL SED C, Sensors & Electron Devices Directorate, Adelphi, MD 20783 USA. RP Zhang, SS (reprint author), US Army Res Lab, Electrochem Branch, RDRL SED C, Sensors & Electron Devices Directorate, Adelphi, MD 20783 USA. EM zzhang@anl.gov; shengshui.zhang.civ@mail.mil NR 51 TC 2 Z9 2 U1 0 U2 1 PU SPRINGER PI NEW YORK PA 233 SPRING STREET, NEW YORK, NY 10013, UNITED STATES SN 1865-3529 BN 978-3-319-15458-9; 978-3-319-15457-2 J9 GREEN ENERGY TECHNOL PY 2015 BP 337 EP 352 DI 10.1007/978-3-319-15458-9_12 D2 10.1007/978-3-319-15458-9 PG 16 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE4HR UT WOS:000371733200013 ER PT S AU Zhang, SS Zhang, ZC AF Zhang, Sheng Shui Zhang, Zhengcheng BE Zhang, Z Zhang, SS TI Oxygen Redox Catalyst for Rechargeable Lithium-Air Battery SO RECHARGEABLE BATTERIES: MATERIALS, TECHNOLOGIES AND NEW TRENDS SE Green Energy and Technology LA English DT Article; Book Chapter ID HIGHLY EFFICIENT ELECTROCATALYST; REDUCTION REACTION; LI-O-2 BATTERY; OXIDE ELECTROCATALYSTS; BIFUNCTIONAL CATALYST; CARBON; ELECTRODE; NITROGEN; CATHODE; SULFUR C1 [Zhang, Sheng Shui] US Army Res Lab, Electrochem Branch, RDRL SED C, Sensors & Elect Devices Directorate, Adelphi, MD 20783 USA. [Zhang, Zhengcheng] Argonne Natl Lab, Chem Sci & Engn Div, Lemont, IL 60439 USA. RP Zhang, SS (reprint author), US Army Res Lab, Electrochem Branch, RDRL SED C, Sensors & Elect Devices Directorate, Adelphi, MD 20783 USA. EM shengshui.zhang.civ@mail.mil; zzhang@anl.gov NR 64 TC 0 Z9 0 U1 2 U2 2 PU SPRINGER PI NEW YORK PA 233 SPRING STREET, NEW YORK, NY 10013, UNITED STATES SN 1865-3529 BN 978-3-319-15458-9; 978-3-319-15457-2 J9 GREEN ENERGY TECHNOL PY 2015 BP 541 EP 557 DI 10.1007/978-3-319-15458-9_19 D2 10.1007/978-3-319-15458-9 PG 17 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE4HR UT WOS:000371733200020 ER PT S AU Cao, RG Qian, JF Zhang, JG Xu, W AF Cao, Ruiguo Qian, Jiangfeng Zhang, Ji-Guang Xu, Wu BE Zhang, Z Zhang, SS TI Organic Cathode Materials for Rechargeable Batteries SO RECHARGEABLE BATTERIES: MATERIALS, TECHNOLOGIES AND NEW TRENDS SE Green Energy and Technology LA English DT Article; Book Chapter ID LITHIUM-ION BATTERIES; HIGH-ENERGY DENSITY; REDOX FLOW BATTERY; RADICAL POLYMER-CATHODE; ELECTROCHEMICALLY ACTIVE POLYMERS; OXYGEN COORDINATION COMPLEX; RESEARCH-AND-DEVELOPMENT; WALLED CARBON NANOTUBES; LI-ION; CHARGE-STORAGE C1 [Cao, Ruiguo; Qian, Jiangfeng; Zhang, Ji-Guang; Xu, Wu] Pacific NW Natl Lab, Energy & Environm Directorate, Richland, WA 99354 USA. RP Xu, W (reprint author), Pacific NW Natl Lab, Energy & Environm Directorate, Richland, WA 99354 USA. EM wu.xu@pnnl.gov OI Xu, Wu/0000-0002-2685-8684 NR 184 TC 0 Z9 0 U1 3 U2 4 PU SPRINGER PI NEW YORK PA 233 SPRING STREET, NEW YORK, NY 10013, UNITED STATES SN 1865-3529 BN 978-3-319-15458-9; 978-3-319-15457-2 J9 GREEN ENERGY TECHNOL PY 2015 BP 637 EP 671 DI 10.1007/978-3-319-15458-9_23 D2 10.1007/978-3-319-15458-9 PG 35 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE4HR UT WOS:000371733200024 ER PT S AU Abdurachmanov, D Elmer, P Eulisse, G Knight, R AF Abdurachmanov, David Elmer, Peter Eulisse, Giulio Knight, Robert GP IOP TI Future Computing Platforms for Science in a Power Constrained Era SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB Power consumption will be a key constraint on the future growth of Distributed High Throughput Computing (DHTC) as used by High Energy Physics (HEP). This makes performance-per-watt a crucial metric for selecting cost-efficient computing solutions. For this paper, we have done a wide survey of current and emerging architectures becoming available on the market including x86-64 variants, ARMv7 32-bit, ARMv8 64-bit, Many-Core and GPU solutions, as well as newer System-on-Chip (SoC) solutions. We compare performance and energy efficiency using an evolving set of standardized HEP-related benchmarks and power measurement techniques we have been developing. We evaluate the potential for use of such computing solutions in the context of DHTC systems, such as the Worldwide LHC Computing Grid (WLCG). C1 [Abdurachmanov, David; Eulisse, Giulio] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. [Elmer, Peter] Princeton Univ, Dept Phys, Princeton, NJ 08540 USA. [Knight, Robert] Princeton Univ, Off Informat Technol, Res Comp, Princeton, NJ 08540 USA. RP Abdurachmanov, D (reprint author), Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. EM Giulio.Eulisse@cern.ch NR 9 TC 0 Z9 0 U1 1 U2 2 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 092007 DI 10.1088/1742-6596/664/9/092007 PG 8 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140603075 ER PT S AU Abdurachmanov, D Degano, A Elmer, P Eulisse, G Mendez, D Muzaffar, S AF Abdurachmanov, David Degano, Alessandro Elmer, Peter Eulisse, Giulio Mendez, David Muzaffar, Shahzad CA CMS Collaboration GP IOP TI Optimizing CMS build infrastructure via Apache Mesos SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB The Offline Software of the CMS Experiment at the Large Hadron Collider (LHC) at CERN consists of 6M lines of in-house code, developed over a decade by nearly 1000 physicists, as well as a comparable amount of general use open-source code. A critical ingredient to the success of the construction and early operation of the WLCG was the convergence, around the year 2000, on the use of a homogeneous environment of commodity x86-64 processors and Linux. Apache Mesos is a cluster manager that provides efficient resource isolation and sharing across distributed applications, or frameworks. It can run Hadoop, Jenkins, Spark, Aurora, and other applications on a dynamically shared pool of nodes. We present how we migrated our continuous integration system to schedule jobs on a relatively small Apache Mesos enabled cluster and how this resulted in better resource usage, higher peak performance and lower latency thanks to the dynamic scheduling capabilities of Mesos. C1 [Abdurachmanov, David; Eulisse, Giulio; Muzaffar, Shahzad] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. [Degano, Alessandro] Univ Turin, I-10124 Turin, Italy. [Elmer, Peter] Princeton Univ, Dept Phys, Princeton, NJ 08540 USA. [Mendez, David] Univ Los Andes, Bogota, Colombia. RP Abdurachmanov, D (reprint author), Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. EM Giulio.Eulisse@cern.ch NR 4 TC 0 Z9 0 U1 1 U2 3 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 062013 DI 10.1088/1742-6596/664/6/062013 PG 6 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140602003 ER PT S AU Adams, D Calafiura, P Delsart, PA Elsing, M Farrell, S Koeneke, K Krasznahorkay, A Krumnack, N Lancon, E Lavrijsen, W Laycock, P Lei, XW Strandberg, S Verkerke, W Vivarelli, I Woudstra, M AF Adams, David Calafiura, Paolo Delsart, Pierre-Antoine Elsing, Markus Farrell, Steven Koeneke, Karsten Krasznahorkay, Attila Krumnack, Nils Lancon, Eric Lavrijsen, Wim Laycock, Paul Lei, Xiaowen Strandberg, Sara Verkerke, Wouter Vivarelli, Iacopo Woudstra, Martin CA ATLAS Collaboration GP IOP TI Dual-use tools and systematics-aware analysis workflows in the ATLAS Run-2 analysis model SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB The ATLAS analysis model has been overhauled for the upcoming run of data collection in 2015 at 13 TeV. One key component of this upgrade was the Event Data Model (EDM), which now allows for greater flexibility in the choice of analysis software framework and provides powerful new features that can be exploited by analysis software tools. A second key component of the upgrade is the introduction of a dual-use tool technology, which provides abstract interfaces for analysis software tools to run in either the Athena framework or a ROOT-based framework. The tool interfaces, including a new interface for handling systematic uncertainties, have been standardized for the development of improved analysis workflows and consolidation of high-level analysis tools. This paper will cover the details of the dual-use tool functionality, the systematics interface, and how these features fit into a centrally supported analysis environment. C1 [Adams, David] Brookhaven Natl Lab, Upton, NY 11973 USA. [Calafiura, Paolo; Farrell, Steven; Lavrijsen, Wim] Lawrence Berkeley Natl Lab, Berkeley, CA USA. [Delsart, Pierre-Antoine] CNRS, F-75700 Paris, France. [Elsing, Markus; Krasznahorkay, Attila] European Org Nucl Res, Geneva, Switzerland. [Koeneke, Karsten] Univ Freiburg, Freiburg, Germany. [Krumnack, Nils] Iowa State Univ, Iowa City, IA USA. [Lancon, Eric] Ctr Etud Saclay Gif Sur Yvette, Gif Sur Yvette, France. [Laycock, Paul] Univ Liverpool, Liverpool L69 3BX, Merseyside, England. [Lei, Xiaowen] Univ Arizona, Tucson, AZ 85721 USA. [Strandberg, Sara] Stockholm Univ, Stockholm, Sweden. [Verkerke, Wouter] Nikhef Natl Inst Subatom Phys, Amsterdam, Netherlands. [Vivarelli, Iacopo] Univ Sussex, Brighton BN1 9RH, E Sussex, England. [Woudstra, Martin] Univ Manchester, Manchester M13 9PL, Lancs, England. RP Adams, D (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. EM SFarrell@lbl.gov NR 5 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 032007 DI 10.1088/1742-6596/664/3/032007 PG 6 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140600050 ER PT S AU Amadio, G Apostolakis, J Bandieramonte, M Bianchini, C Bitzes, G Brun, R Canal, P Carminati, F Licht, JD Duhem, L Elvira, D Gheata, A Jun, SY Lima, G Novak, M Presbyterian, M Shadura, O Seghal, R Wenzel, S AF Amadio, G. Apostolakis, J. Bandieramonte, M. Bianchini, C. Bitzes, G. Brun, R. Canal, P. Carminati, F. Licht, J. de Fine Duhem, L. Elvira, D. Gheata, A. Jun, S. Y. Lima, G. Novak, M. Presbyterian, M. Shadura, O. Seghal, R. Wenzel, S. GP IOP TI First experience of vectorizing electromagnetic physics models for detector simulation SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB The recent emergence of hardware architectures characterized by many-core or accelerated processors has opened new opportunities for concurrent programming models taking advantage of both SIMD and SIMT architectures. The GeantV vector prototype for detector simulations has been designed to exploit both the vector capability of mainstream CPUs and multi-threading capabilities of coprocessors including NVidia GPUs and Intel Xeon Phi. The characteristics of these architectures are very different in terms of the vectorization depth, parallelization needed to achieve optimal performance or memory access latency and speed. An additional challenge is to avoid the code duplication often inherent to supporting heterogeneous platforms. In this paper we present the first experience of vectorizing electromagnetic physics models developed for the GeantV project. C1 [Amadio, G.; Bianchini, C.] Sao Paulo State Univ UNESP, Parallel Comp Ctr, Sao Paulo, Brazil. [Apostolakis, J.; Bitzes, G.; Brun, R.; Carminati, F.; Gheata, A.; Shadura, O.; Wenzel, S.] CERN, PH Dept, CH-1211 Geneva, Switzerland. [Bandieramonte, M.] Osserv Astrofis Catania, Inst Nazl Astrofis, I-95125 Catania, Italy. [Canal, P.; Elvira, D.; Jun, S. Y.; Lima, G.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. [Licht, J. de Fine] Univ Copenhagen, Copenhagen, Denmark. [Duhem, L.] Intel Corp, Santa Clara, CA USA. [Presbyterian, M.; Seghal, R.] Bhabha Atom Res Ctr, Bombay 400085, Maharashtra, India. [Bianchini, C.] Univ Prebiteriana Mackenzie, Sao Paulo, Brazil. RP Amadio, G (reprint author), Sao Paulo State Univ UNESP, Parallel Comp Ctr, Sao Paulo, Brazil. EM syjun@fnal.gov RI Bianchini, Calebe/E-4405-2014 OI Bianchini, Calebe/0000-0001-7683-3437 NR 15 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 092013 DI 10.1088/1742-6596/664/9/092013 PG 6 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140603081 ER PT S AU Amadio, G Apostolakis, J Bandieramonte, M Bhattacharyya, A Bianchini, C Brun, R Canal, P Carminati, F Duhem, L Elvira, D Licht, JD Gheata, A Iope, RL Lima, G Mohanty, A Nikitina, T Novak, M Pokorski, W Seghal, R Shadura, O Vallecorsa, S Wenzel, S AF Amadio, G. Apostolakis, J. Bandieramonte, M. Bhattacharyya, A. Bianchini, C. Brun, R. Canal, Ph Carminati, F. Duhem, L. Elvira, D. Licht, J. de Fine Gheata, A. Iope, R. L. Lima, G. Mohanty, A. Nikitina, T. Novak, M. Pokorski, W. Seghal, R. Shadura, O. Vallecorsa, S. Wenzel, S. GP IOP TI The GeantV project: preparing the future of simulation SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB Detector simulation is consuming at least half of the HEP computing cycles, and even so, experiments have to take hard decisions on what to simulate, as their needs greatly surpass the availability of computing resources. New experiments still in the design phase such as FCC, CLIC and ILC as well as upgraded versions of the existing LHC detectors will push further the simulation requirements. Since the increase in computing resources is not likely to keep pace with our needs, it is therefore necessary to explore innovative ways of speeding up simulation in order to sustain the progress of High Energy Physics. The GeantV project aims at developing a high performance detector simulation system integrating fast and full simulation that can be ported on different computing architectures, including CPU accelerators. After more than two years of R&D the project has produced a prototype capable of transporting particles in complex geometries exploiting micro-parallelism, SIMD and multithreading. Portability is obtained via C++ template techniques that allow the development of machine-independent computational kernels. A set of tables derived from Geant4 for cross sections and final states provides a realistic shower development and, having been ported into a Geant4 physics list, can be used as a basis for a direct performance comparison. C1 [Amadio, G.; Bianchini, C.; Iope, R. L.] Sao Paulo State Univ, Sao Paulo, Brazil. [Apostolakis, J.; Brun, R.; Carminati, F.; Gheata, A.; Nikitina, T.; Novak, M.; Pokorski, W.; Shadura, O.; Vallecorsa, S.; Wenzel, S.] CERN, Geneva, Switzerland. [Bandieramonte, M.] Ist Nazl Astrofis, Osservatorio Astrofis Catania INAF, Catania, Italy. [Bhattacharyya, A.; Mohanty, A.; Seghal, R.] Bhabha Atom Res Ctr, Bombay 400085, Maharashtra, India. [Canal, Ph; Elvira, D.; Lima, G.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. [Duhem, L.] Intel Corp, Santa Clara, CA USA. [Licht, J. de Fine] Univ Copenhagen, Copenhagen, Denmark. [Bianchini, C.] Univ Prebiteriana Mackenzie, Sao Paulo, Brazil. RP Carminati, F (reprint author), CERN, Geneva, Switzerland. EM Federico.Carminati@cern.ch RI Bianchini, Calebe/E-4405-2014 OI Bianchini, Calebe/0000-0001-7683-3437 NR 9 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 072006 DI 10.1088/1742-6596/664/7/072006 PG 8 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140602064 ER PT S AU Anderson, J Borga, A Boterenbrood, H Chen, H Chen, K Drake, G Francis, D Gorini, B Lanni, F Miotto, GL Levinson, L Narevicius, J Plessl, C Roich, A Ryu, S Schreuder, F Schumacher, J Vandelli, W Vermeulen, J Zhang, J AF Anderson, J. Borga, A. Boterenbrood, H. Chen, H. Chen, K. Drake, G. Francis, D. Gorini, B. Lanni, F. Miotto, G. Lehmann Levinson, L. Narevicius, J. Plessl, C. Roich, A. Ryu, S. Schreuder, F. Schumacher, J. Vandelli, W. Vermeulen, J. Zhang, J. GP IOP TI FELIX: a High-Throughput Network Approach for Interfacing to Front End Electronics for ATLAS Upgrades SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB The ATLAS experiment at CERN is planning full deployment of a new unified optical link technology for connecting detector front end electronics on the timescale of the LHC Run 4 (2025). It is estimated that roughly 8000 GBT (GigaBit Transceiver) links, with transfer rates up to 10.24 Gbps, will replace existing links used for readout, detector control and distribution of timing and trigger information. A new class of devices will be needed to interface many GBT links to the rest of the trigger, data-acquisition and detector control systems. In this paper FELIX (Front End LInk eXchange) is presented, a PC-based device to route data from and to multiple GBT links via a high-performance general purpose network capable of a total throughput up to 0(20 Tbps). FELIX implies architectural changes to the ATLAS data acquisition system, such as the use of industry standard COTS components early in the DAQ chain. Additionally the design and implementation of a FELIX demonstration platform is presented and hardware and software aspects will be discussed. C1 [Anderson, J.; Drake, G.; Ryu, S.; Zhang, J.] Argonne Natl Lab, Argonne, IL 60439 USA. [Chen, H.; Chen, K.; Lanni, F.] Brookhaven Natl Lab, Upton, NY 11973 USA. [Francis, D.; Gorini, B.; Miotto, G. Lehmann; Schumacher, J.; Vandelli, W.] CERN, CH-1211 Geneva 23, Switzerland. [Borga, A.; Boterenbrood, H.; Schreuder, F.; Vermeulen, J.] Univ Amsterdam, Nikhef Natl Inst Subatom Phys, NL-1012 WX Amsterdam, Netherlands. [Plessl, C.; Schumacher, J.] Univ Paderborn, Dept Comp Sci, Paderborn, Germany. [Levinson, L.; Narevicius, J.; Roich, A.] Weizmann Inst Sci, Dept Particle Phys, IL-76100 Rehovot, Israel. RP Anderson, J (reprint author), Argonne Natl Lab, Argonne, IL 60439 USA. EM joern.schumacher@cern.ch NR 5 TC 0 Z9 0 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 082050 DI 10.1088/1742-6596/664/8/082050 PG 8 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140603062 ER PT S AU Andronis, A Bauer, D Chaze, O Colling, D Dobson, M Fayer, S Girone, M Grandi, C Huffman, A Hufnagel, D Khan, FA Lahiff, A McCrae, A Rand, D Sgaravatto, M Tiradani, A Zhang, XM AF Andronis, Anastasios Bauer, Daniela Chaze, Olivier Colling, David Dobson, Marc Fayer, Simon Girone, Maria Grandi, Claudio Huffman, Adam Hufnagel, Dirk Khan, Farrukh Aftab Lahiff, Andrew McCrae, Alison Rand, Duncan Sgaravatto, Massimo Tiradani, Anthony Zhang, Xiaomei CA CMS Collaboration GP IOP TI The Diverse use of Clouds by CMS SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB The resources CMS is using are increasingly being offered as clouds. In Run 2 of the LHC the majority of CMS CERN resources, both in Meyrin and at the Wigner Computing Centre, will be presented as cloud resources on which CMS will have to build its own infrastructure. This infrastructure will need to run all of the CMS workflows including: Tier 0, production and user analysis. In addition, the CMS High Level Trigger will provide a compute resource comparable in scale to the total offered by the CMS Tier 1 sites, when it is not running as part of the trigger system. During these periods a cloud infrastructure will be overlaid on this resource, making it accessible for general CMS use. Finally, CMS is starting to utilise cloud resources being offered by individual institutes and is gaining experience to facilitate the use of opportunistically available cloud resources. We present a snap shot of this infrastructure and its operation at the time of the CHEP2015 conference. C1 [Andronis, Anastasios] Univ Ioannina, GR-45110 Ioannina, Greece. [Bauer, Daniela; Colling, David; Fayer, Simon; Huffman, Adam; Rand, Duncan] Univ London Imperial Coll Sci Technol & Med, Blackett Lab, Prince Consort Rd, London SW7 2AZ, England. [Andronis, Anastasios; Chaze, Olivier; Dobson, Marc; Girone, Maria; McCrae, Alison] CERN, CH-1211 Geneva 23, Switzerland. [Grandi, Claudio] Ist Nazl Fis Nucl, I-40127 Bologna, Italy. [Hufnagel, Dirk; Tiradani, Anthony] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. [Khan, Farrukh Aftab] Natl Ctr Phys, Islamabad 45320, Pakistan. [Lahiff, Andrew] Rutherford Appleton Lab, Didcot OX11 0QX, Oxon, England. [Sgaravatto, Massimo] Ist Nazl Fis Nucl, I-35131 Padua, Italy. [Zhang, Xiaomei] Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China. RP Colling, D (reprint author), Univ London Imperial Coll Sci Technol & Med, Blackett Lab, Prince Consort Rd, London SW7 2AZ, England. EM d.colling@imperial.ac.uk NR 7 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 022012 DI 10.1088/1742-6596/664/2/022012 PG 8 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140600014 ER PT S AU Apyan, A Badillo, J Cruz, JD Gadrat, S Gutsche, O Holzman, B Lahiff, A Magini, N Mason, D Perez, A Stober, F Taneja, S Taze, M Wissing, C AF Apyan, A. Badillo, J. Cruz, J. Diaz Gadrat, S. Gutsche, O. Holzman, B. Lahiff, A. Magini, N. Mason, D. Perez, A. Stober, F. Taneja, S. Taze, M. Wissing, C. CA CMS Collaboration GP IOP TI Pooling the resources of the CMS Tier-1 sites SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB The CMS experiment at the LHC relies on 7 Tier-1 centres of the WLCG to perform the majority of its bulk processing activity, and to archive its data. During the first run of the LHC, these two functions were tightly coupled as each Tier-1 was constrained to process only the data archived on its hierarchical storage. This lack of flexibility in the assignment of processing workflows occasionally resulted in uneven resource utilisation and in an increased latency in the delivery of the results to the physics community. The long shutdown of the LHC in 2013-2014 was an opportunity to revisit this mode of operations, disentangling the processing and archive functionalities of the Tier-1 centres. The storage services at the Tier-ls were redeployed breaking the traditional hierarchical model: each site now provides a large disk storage to host input and output data for processing, and an independent tape storage used exclusively for archiving. Movement of data between the tape and disk endpoints is not automated, but triggered externally through the WLCG transfer management systems. With this new setup, CMS operations actively controls at any time which data is available on disk for processing and which data should be sent to archive. Thanks to the high-bandwidth connectivity guaranteed by the LHCOPN, input data can be freely transferred between disk endpoints as needed to take advantage of free CPU, turning the Tier-ls into a large pool of shared resources. The output data can be validated before archiving them permanently, and temporary data formats can be produced without wasting valuable tape resources. Finally, the data hosted on disk at Tier-ls can now be made available also for user analysis since there is no risk any longer of triggering chaotic staging from tape. In this contribution, we describe the technical solutions adopted for the new disk and tape endpoints at the sites, and we report on the commissioning and scale testing of the service. We detail the procedures implemented by CMS computing operations to actively manage data on disk at Tier-1 sites, and we give examples of the benefits brought to CMS workflows by the additional flexibility of the new system. C1 [Apyan, A.] MIT, 77 Massachusetts Ave, Cambridge, MA 02139 USA. [Badillo, J.] Univ Los Andes, Bogota, Colombia. [Cruz, J. Diaz; Gutsche, O.; Holzman, B.; Magini, N.; Mason, D.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. [Gadrat, S.] Inst Natl Phys Nucl & Phys Particules IN2P3, Ctr Calcul, Lyon CC, F-69622 Villeurbanne, France. [Lahiff, A.] Rutherford Appleton Lab, Didcot OX11 0QX, Oxon, England. [Perez, A.] CIEMAT, Div Fis Particulas, E-28040 Madrid, Spain. [Stober, F.] Karlsruhe Inst Technol, D-76128 Karlsruhe, Germany. [Taneja, S.] Univ Bologna, Sez INFN, I-40127 Bologna, Italy. [Taze, M.] Cukurova Univ, Fen Ed Fak, TR-01330 Adana, Turkey. [Wissing, C.] DESY, D-22607 Hamburg, Germany. RP Apyan, A (reprint author), MIT, 77 Massachusetts Ave, Cambridge, MA 02139 USA. EM christoph.wissing@desy.de NR 11 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 042056 DI 10.1088/1742-6596/664/4/042056 PG 7 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140601045 ER PT S AU Arkhipkin, D Lauret, J Shanmuganathan, PV AF Arkhipkin, D. Lauret, J. Shanmuganathan, P. V. GP IOP TI Modular and scalable RESTful API to sustain STAR collaboration's record keeping SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB STAR collaboration's record system is a collection of heterogeneous and sparse information associated to each members and institutions. In its original incarnation, only flat information was stored revealing many restrictions such as the lack of historical change information, the inability to keep track of members leaving and re-joining STAR, or the ability to easily extend the saved information as new requirements appeared. In mid-2013, a new project was launched covering an extensive set of revisited requirements. The requirements led us to a design based on a RESTful API, back-end storage engine relying on key/value pair data representation model coupled with a tiered architecture design. This design was motivated by the fact that unifying many STAR tools, relying on the same business logic and storage engine, was a key and central feature for the maintainability and presentation of records. This central service API would leave no ambiguities and provide easy service integration between STAR tools. The new design stores the changes in records dynamically and allows tracking the changes chronologically. The storage engine is extensible as new field of information emerges (member specific or general) without affecting the presentation or the business logic layers. The new record system features a convenient administrative interface, fuzzy algorithms for data entry and search, and provides basic statistics and graphs. Finally, this modular approach is supplemented with access control, allowing private information and administrative operations to be hidden away from public eyes. C1 [Arkhipkin, D.; Lauret, J.] Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. [Shanmuganathan, P. V.] Kent State Univ, Kent, OH 44242 USA. RP Arkhipkin, D (reprint author), Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. EM arkhipkin@bnl.gov; jlauret@bnl.gov; sprashan@kent.edu NR 1 TC 0 Z9 0 U1 0 U2 2 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 052021 DI 10.1088/1742-6596/664/5/052021 PG 7 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140601068 ER PT S AU Aurisano, A Backhouse, C Hatcher, R Mayer, N Musser, J Patterson, R Schroeter, R Sousa, A AF Aurisano, A. Backhouse, C. Hatcher, R. Mayer, N. Musser, J. Patterson, R. Schroeter, R. Sousa, A. GP IOP TI The NOvA simulation chain SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB The NOvA experiment is a two-detector, long-baseline neutrino experiment operating in the recently upgraded NuMI muon neutrino beam. Simulating neutrino interactions and backgrounds requires many steps including: the simulation of the neutrino beam flux using FLUKA and the FLUGG interface; cosmic ray generation using CRY; neutrino interaction modeling using GENIE; and a simulation of the energy deposited in the detector using GEANT4. To shorten generation time, the modeling of detector-specific aspects, such as photon transport, detector and electronics noise, and readout electronics, employs custom, parameterized simulation applications. We will describe the NOvA simulation chain, and present details on the techniques used in modeling photon transport near the ends of cells, and in developing a novel data-driven noise simulation. Due to the high intensity of the NuMI beam, the Near Detector samples a high rate of muons originating in the surrounding rock. In addition, due to its location on the surface at Ash River, MN, the Far Detector collects a large rate 0140 kHz) of cosmic muons. We will discuss the methods used in NOvA for overlaying rock muons and cosmic ray muons with simulated neutrino interactions and show how realistically the final simulation reproduces the preliminary NOvA data. C1 [Aurisano, A.; Sousa, A.] Univ Cincinnati, Cincinnati, OH USA. [Backhouse, C.; Patterson, R.] CALTECH, Pasadena, CA 91125 USA. [Hatcher, R.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. [Mayer, N.] Tufts Univ, Medford, MA 02155 USA. [Musser, J.] Indiana Univ, Bloomington, IN USA. [Schroeter, R.] Harvard Univ, Cambridge, MA 02138 USA. RP Aurisano, A (reprint author), Univ Cincinnati, Cincinnati, OH USA. EM aurisaam@ucmail.uc.edu; bckhouse@caltech.edu; rhatcher@fnal.gov; nathan.mayer@tufts.edu; jmusser@indiana.edu; rbpatter@caltech.edu; rschroet@physics.harvard.edu; Alex.Sousa@uc.edu NR 10 TC 2 Z9 2 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 072002 DI 10.1088/1742-6596/664/7/072002 PG 8 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140602060 ER PT S AU Aurisano, A Backhouse, C Davies, GS Illingworth, R Mayer, N Mengel, M Norman, A Rocco, D Zirnstein, J AF Aurisano, A. Backhouse, C. Davies, G. S. Illingworth, R. Mayer, N. Mengel, M. Norman, A. Rocco, D. Zirnstein, J. GP IOP TI Data handling with SAM and art at the NO nu A experiment SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB During operations, NOvA produces between 5,000 and 7,000 raw files per day with peaks in excess of 12,000. These files must be processed in several stages to produce fully calibrated and reconstructed analysis files. In addition, many simulated neutrino interactions must be produced and processed through the same stages as data. To accommodate the large volume of data and Monte Carlo, production must be possible both on the Fermilab grid and on off-site farms, such as the ones accessible through the Open Science Grid. To handle the challenge of cataloging these files and to facilitate their off-line processing, we have adopted the SAM system developed at Fermilab. SAM indexes files according to metadata, keeps track of each file's physical locations, provides dataset management facilities, and facilitates data transfer to off-site grids. To integrate SAM with Fermilab's art software framework and the NOvA production workflow, we have developed methods to embed metadata into our configuration files, art files, and standalone ROOT files. A module in the art framework propagates the embedded information from configuration files into art files, and from input art files to output art files, allowing us to maintain a complete processing history within our files. Embedding metadata in configuration files also allows configuration files indexed in SAM to be used as inputs to Monte Carlo production jobs. Further, SAM keeps track of the input files used to create each output file. Parentage information enables the construction of self-draining datasets which have become the primary production paradigm used at NOvA. In this paper we will present an overview of SAM at NOvA and how it has transformed the file production framework used by the experiment. C1 [Aurisano, A.] Univ Cincinnati, Cincinnati, OH USA. [Backhouse, C.] CALTECH, Pasadena, CA 91125 USA. [Davies, G. S.] Indiana Univ, Bloomington, IN USA. [Illingworth, R.; Mengel, M.; Norman, A.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. [Mayer, N.] Tufts Univ, Medford, MA 02155 USA. [Rocco, D.; Zirnstein, J.] Univ Minnesota, Minneapolis, MN USA. RP Aurisano, A (reprint author), Univ Cincinnati, Cincinnati, OH USA. EM aurisaam@ucmail.uc.edu; bckhouse@caltech.edu; gsdavies@iu.edu; illingwo@fnal.gov; nathan.mayer@tufts.edu; mengel@fnal.gov; anorman@fnal.gov; rocco@physics.umn.edu; jan.zirnstein@gmail.com NR 5 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 042001 DI 10.1088/1742-6596/664/4/042001 PG 5 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140600080 ER PT S AU Balcas, J Belforte, S Bockelman, B Colling, D Gutsche, O Hufnagel, D Khan, F Larson, K Letts, J Mascheroni, M Masons, D McCrea, A Piperov, S Saiz-Santos, M Sfiligoi, I Tanasijczuk, A Wissing, C AF Balcas, J. Belforte, S. Bockelman, B. Colling, D. Guetsche, O. Hufnagel, D. Khan, F. Larson, K. Letts, J. Mascheroni, M. Masons, D. McCrea, A. Piperov, S. Saiz-Santos, M. Sfiligoi, I. Tanasijczuk, A. Wissing, C. CA CMS Collaboration GP IOP TI Using the glideinWMS System as a Common Resource Provisioning Layer in CMS SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB CMS will require access to more than 125k processor cores for the beginning of Run 2 in 2015 to carry out its ambitious physics program with more and higher complexity events. During Run1 these resources were predominantly provided by a mix of grid sites and local batch resources. During the long shut down cloud infrastructures, diverse opportunistic resources and HPC supercomputing centers were made available to CMS, which further complicated the operations of the submission infrastructure. In this presentation we will discuss the CMS effort to adopt and deploy the glideinWMS system as a common resource provisioning layer to grid, cloud, local batch, and opportunistic resources and sites. We will address the challenges associated with integrating the various types of resources, the efficiency gains and simplifications associated with using a common resource provisioning layer, and discuss the solutions found. We will finish with an outlook of future plans for how CMS is moving forward on resource provisioning for more heterogenous architectures and services. C1 [Balcas, J.] Vilnius Univ, Vilnius, Lithuania. [Belforte, S.] Univ Trieste, INFN Sez Trieste, Trieste, Italy. [Bockelman, B.] Univ Nebraska Lincoln, Lincoln, NE USA. [Colling, D.] Univ London Imperial Coll Sci Technol & Med, London SW7 2AZ, England. [Guetsche, O.; Hufnagel, D.; Larson, K.; Masons, D.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. [Khan, F.] Quaid I Azam Univ, Natl Ctr Phys, Islamabad, Pakistan. [Letts, J.; McCrea, A.; Saiz-Santos, M.; Sfiligoi, I.; Tanasijczuk, A.] Univ Calif San Diego, La Jolla, CA 92093 USA. [Mascheroni, M.] Univ Milano Bicocca, INFN Sez Milano Bicocca, Milan, Italy. [Piperov, S.] Brown Univ, Providence, RI 02912 USA. [Wissing, C.] DESY, Hamburg, Germany. RP Balcas, J (reprint author), Vilnius Univ, Vilnius, Lithuania. EM jletts@ucsd.edu NR 5 TC 0 Z9 0 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 062031 DI 10.1088/1742-6596/664/6/062031 PG 8 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140602021 ER PT S AU Balcas, J Belforte, S Bockelman, B Gutsche, O Khan, F Larson, K Letts, J Mascheroni, M Mason, D McCrea, A Saiz-Santos, M Sfiligoi, I AF Balcas, J. Belforte, S. Bockelman, B. Guetsche, O. Khan, F. Larson, K. Letts, J. Mascheroni, M. Mason, D. McCrea, A. Saiz-Santos, M. Sfiligoi, I. CA CMS Collaboration GP IOP TI Pushing HTCondor and glideinWMS to 200K+Jobs in a Global Pool for CMS before Run 2 SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB The CMS experiment at the LHC relies on HTCondor and glideinWMS as its primary batch and pilot-based Grid provisioning system. So far we have been running several independent resource pools, but we are working on unifying them all to reduce the operational load and more effectively share resources between various activities in CMS. The major challenge of this unification activity is scale. The combined pool size is expected to reach 200K job slots, which is significantly bigger than any other multi-user HTCondor based system currently in production. To get there we have studied scaling limitations in our existing pools, the biggest of which tops out at about 70K slots, providing valuable feedback to the development communities, who have responded by delivering improvements which have helped us reach higher and higher scales with more stability. We have also worked on improving the organization and support model for this critical service during Run 2 of the LHC. This contribution will present the results of the scale testing and experiences from the first months of running the Global Pool. C1 [Balcas, J.] Vilnius Univ, Vilnius, Lithuania. [Belforte, S.] Univ Trieste, INFN Sez Trieste, Trieste, Italy. [Bockelman, B.] Univ Nebraska Lincoln, Lincoln, NE USA. [Guetsche, O.; Larson, K.; Mason, D.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. [Khan, F.] Quaid I Azam Univ, Natl Ctr Phys, Islamabad, Pakistan. [Letts, J.; McCrea, A.; Saiz-Santos, M.; Sfiligoi, I.] Univ Calif San Diego, La Jolla, CA 92093 USA. [Mascheroni, M.] Univ Milano Bicocca, INFN Sez Milano Bicocca, Milan, Italy. RP Balcas, J (reprint author), Vilnius Univ, Vilnius, Lithuania. EM jletts@ucsd.edu NR 10 TC 0 Z9 0 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 062030 DI 10.1088/1742-6596/664/6/062030 PG 7 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140602020 ER PT S AU Ballestrero, S Batraneanu, SM Brasolin, F Contescu, C Fazio, D Di Girolamo, A Lee, CJ Astigarraga, MEP Scannicchio, DA Sedov, A Twomey, MS Wang, F Zaytsev, A AF Ballestrero, S. Batraneanu, S. M. Brasolin, F. Contescu, C. Fazio, D. Di Girolamo, A. Lee, C. J. Astigarraga, M. E. Pozo Scannicchio, D. A. Sedov, A. Twomey, M. S. Wang, F. Zaytsev, A. CA ATLAS Collaboration GP IOP TI Design, Results, Evolution and Status of the ATLAS Simulation at Point1 Project SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB During the LHC Long Shutdown 1 (LS1) period, that started in 2013, the Simulation at Point1 (Sim@P1) project takes advantage, in an opportunistic way, of the TDAQ (Trigger and Data Acquisition) HLT (High-Level Trigger) farm of the ATLAS experiment. This farm provides more than 1300 compute nodes, which are particularly suited for running event generation and Monte Carlo production jobs that are mostly CPU and not I/O bound. It is capable of running up to 2700 Virtual Machines (VMs) each with 8 CPU cores, for a total of up to 22000 parallel jobs. This contribution gives a review of the design, the results, and the evolution of the Sim@P1 project, operating a large scale OpenStack based virtualized platform deployed on top of the ATLAS TDAQ HLT farm computing resources. During LS1, Sim@P1 was one of the most productive ATLAS sites: it delivered more than 33 million CPU-hours and it generated more than 1.1 billion Monte Carlo events. The design aspects are presented: the virtualization platform exploited by Sim@P1 avoids interferences with TDAQ operations and it guarantees the security and the usability of the ATLAS private network. The cloud mechanism allows the separation of the needed support on both infrastructural (hardware, virtualization layer) and logical (Grid site support) levels. This paper focuses on the operational aspects of such a large system during the upcoming LHC Run 2 period: simple, reliable, and efficient tools are needed to quickly switch from Sim@P1 to TDAQ mode and back, to exploit the resources when they are not used for the data acquisition, even for short periods. The evolution of the central OpenStack infrastructure is described, as it was upgraded from Folsom to the Icehouse release, including the scalability issues addressed. C1 [Ballestrero, S.; Lee, C. J.] Univ Johannesburg, Johannesburg, South Africa. [Batraneanu, S. M.; Contescu, C.; Fazio, D.; Di Girolamo, A.; Lee, C. J.; Astigarraga, M. E. Pozo] CERN, CH-1211 Geneva 23, Switzerland. [Brasolin, F.] Ist Nazl Fis Nucl, Sez Bologna, Bologna, Italy. [Contescu, C.] Univ Politehn Bucuresti, Bucharest, Romania. [Scannicchio, D. A.] Univ Calif Irvine, Irvine, CA USA. [Sedov, A.] PIC, Barcelona, Spain. [Sedov, A.] IFAE, Barcelona, Spain. [Twomey, M. S.] Univ Washington, Dept Phys, Seattle, WA 98195 USA. [Wang, F.] Univ Wisconsin, Madison, WI 53706 USA. [Zaytsev, A.] Brookhaven Natl Lab, Upton, NY 11973 USA. RP Ballestrero, S (reprint author), Univ Johannesburg, Johannesburg, South Africa. EM atlas-tdaq-sysadmins@cern.ch NR 9 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 022008 DI 10.1088/1742-6596/664/2/022008 PG 7 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140600010 ER PT S AU Barberis, D Formica, A Gallas, EJ Govi, G Miotto, GL Pfeiffer, A AF Barberis, D. Formica, A. Gallas, E. J. Govi, G. Miotto, G. Lehman Pfeiffer, A. CA ATLAS Collaboration CMS Collaboration GP IOP TI Designing a future Conditions Database based on LHC experience SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB Starting from the experience collected by the ATLAS and CMS experiments in handling condition data during the first LHC run, we present a proposal for a new generation of condition databases, which could be implemented by 2020. We will present the identified relevant data flows for condition data and underline the common use cases that lead to a joint effort for the development of a new system. Condition data is needed in any scientific experiment. It includes any ancillary data associated with primary data taking such as detector configuration, state or calibration or the environment in which the detector is operating. Condition data typically reside outside the primary data store for various reasons (size, complexity or availability) and are best accessed at the point of processing or analysis (including for Monte Carlo simulations). The ability of any experiment to produce correct and timely results depends on the complete and efficient availability of needed conditions for each stage of data handling. Therefore, any experiment needs a condition data architecture which can not only store conditions, but deliver the data efficiently, on demand, to potentially diverse and geographically distributed set of clients. The architecture design should consider facilities to ease conditions management and the monitoring of its conditions entry, access and usage. C1 [Barberis, D.] Ist Nazl Fis Nucl, Sez Genova, Via Dodecaneso 33, I-16146 Genoa, Italy. [Barberis, D.] Univ Genoa, Dipartimento Fis, Genoa, Italy. [Formica, A.] CEA, Saclay IRFU, SEDI, F-91191 Gif Sur Yvette, France. [Gallas, E. J.] Univ Oxford, Dept Phys, Oxford OX1 3RH, England. [Govi, G.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. [Miotto, G. Lehman; Pfeiffer, A.] CERN, CH-1211 Geneva 23, Switzerland. RP Barberis, D (reprint author), Ist Nazl Fis Nucl, Sez Genova, Via Dodecaneso 33, I-16146 Genoa, Italy. EM andrea.formica@cea.fr NR 7 TC 0 Z9 0 U1 1 U2 2 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 042015 DI 10.1088/1742-6596/664/4/042015 PG 8 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140601004 ER PT S AU Barberis, D Zarate, SEC Cranshaw, J Favareto, A Casani, AF Gallas, EJ Glasman, C de la Hoz, SG Hrivnac, J Malon, D Prokoshin, F Cairols, JS Sanchez, J Tobbicke, R Yuan, R AF Barberis, D. Cardenas Zarate, S. E. Cranshaw, J. Favareto, A. Fernandez Casani, A. Gallas, E. J. Glasman, C. Gonzalez de la Hoz, S. Hrivnac, J. Malon, D. Prokoshin, F. Salt Cairols, J. Sanchez, J. Toebbicke, R. Yuan, R. CA ATLAS Collaboration GP IOP TI The ATLAS EventIndex: architecture, design choices, deployment and first operation experience SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB The EventIndex is the complete catalogue of all ATLAS events, keeping the references to all files that contain a given event in any processing stage. It replaces the TAG database, which had been in use during LHC Run 1. For each event it contains its identifiers, the trigger pattern and the GUIDs of the files containing it. Major use cases are event picking, feeding the Event Service used on some production sites, and technical checks of the completion and consistency of processing campaigns. The system design is highly modular so that its components (data collection system, storage system based on Hadoop, query web service and interfaces to other ATLAS systems) could be developed separately and in parallel during LS1. The EventIndex is in operation for the start of LHC Run 2. This paper describes the high-level system architecture, the technical design choices and the deployment process and issues. The performance of the data collection and storage systems, as well as the query services, are also reported. C1 [Barberis, D.; Favareto, A.] Univ Genoa, Genoa, Italy. [Barberis, D.; Favareto, A.] Ist Nazl Fis Nucl, I-16146 Genoa, Italy. [Cardenas Zarate, S. E.; Prokoshin, F.] Univ Tecn Federico Santa Maria, Valparaiso, Chile. [Cranshaw, J.; Malon, D.] Argonne Natl Lab, Argonne, IL 60439 USA. [Fernandez Casani, A.; Gonzalez de la Hoz, S.; Salt Cairols, J.; Sanchez, J.] Univ Valencia, Inst Fis Corpuscular IFIC, Valencia, Spain. [Fernandez Casani, A.; Gonzalez de la Hoz, S.; Salt Cairols, J.; Sanchez, J.] CSIC, Valencia, Spain. [Gallas, E. J.] Univ Oxford, Oxford, England. [Glasman, C.] Univ Autonoma Madrid, Madrid, Spain. [Hrivnac, J.; Yuan, R.] Univ Paris 11, LAL, Orsay, France. [Hrivnac, J.; Yuan, R.] CNRS IN2P3, Orsay, France. [Toebbicke, R.] CERN, Geneva, Switzerland. RP Barberis, D (reprint author), Univ Genoa, Genoa, Italy. EM Dario.Barberis@cern.ch RI Prokoshin, Fedor/E-2795-2012; OI Prokoshin, Fedor/0000-0001-6389-5399; Fernandez Casani, Alvaro/0000-0003-1394-509X NR 12 TC 1 Z9 1 U1 0 U2 2 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 042003 DI 10.1088/1742-6596/664/4/042003 PG 8 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140600082 ER PT S AU Bauerdick, L Bockelman, B Elmer, P Gowdy, S Tadel, M Wurthwein, F AF Bauerdick, L. Bockelman, B. Elmer, P. Gowdy, S. Tadel, M. Wuerthwein, F. GP IOP TI Designing Computing System Architecture and Models for the HL-LHC era SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB This paper describes a programme to study the computing model in CMS after the next long shutdown near the end of the decade. C1 [Bauerdick, L.; Gowdy, S.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. [Bockelman, B.] Univ Nebraska, Comp Sci & Engn, Lincoln, NE 68588 USA. [Elmer, P.] Princeton Univ, Dept Phys, Princeton, NJ 08540 USA. [Tadel, M.; Wuerthwein, F.] Univ Calif San Diego, Dept Phys, La Jolla, CA 92093 USA. RP Bauerdick, L (reprint author), Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. EM sgowdy+chep15@gmail.com NR 3 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 032010 DI 10.1088/1742-6596/664/3/032010 PG 9 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140600053 ER PT S AU Bellenot, B Canal, P Couet, O Ganis, G Mato, P Moneta, L Naumann, A Piparo, D AF Bellenot, B. Canal, Ph Couet, O. Ganis, G. Mato, P. Moneta, L. Naumann, A. Piparo, D. GP IOP TI ROOT 6 and beyond: TObject, C++14 and many cores. SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB Following the release of version 6, ROOT has entered a new area of development. It will leverage the industrial strength compiler library shipping in ROOT 6 and its support of the C++11/14 standard, to significantly simplify and harden ROOT's interfaces and to clarify and substantially improve ROOT's support for multi-threaded environments. This talk will also recap the most important new features and enhancements in ROOT in general, focusing on those allowed by the improved interpreter and better compiler support, including I/O for smart pointers, easier type safe access to the content of TTrees and enhanced multi processor support. C1 [Canal, Ph] Fermilab Natl Accelerator Lab, Batavia, IL USA. [Bellenot, B.; Couet, O.; Ganis, G.; Mato, P.; Moneta, L.; Naumann, A.; Piparo, D.] CERN, Geneva, Switzerland. RP Bellenot, B (reprint author), CERN, Geneva, Switzerland. EM pcanal@fnal.gov OI Naumann, Axel/0000-0002-4725-0766 NR 11 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 062006 DI 10.1088/1742-6596/664/6/062006 PG 8 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140601096 ER PT S AU Belyaev, A Berezhnaya, A Betev, L Buncic, P De, K Drizhuk, D Klimentov, A Lazin, Y Lyalin, I Mashinistov, R Novikov, A Oleynik, D Polyakov, A Poyda, A Ryabinkin, E Teslyuk, A Tkachenko, I Yasnopolskiy, L AF Belyaev, A. Berezhnaya, A. Betev, L. Buncic, P. De, K. Drizhuk, D. Klimentov, A. Lazin, Y. Lyalin, I. Mashinistov, R. Novikov, A. Oleynik, D. Polyakov, A. Poyda, A. Ryabinkin, E. Teslyuk, A. Tkachenko, I. Yasnopolskiy, L. GP IOP TI Integration of Russian Tier-1 Grid Center with High Performance Computers at NRC-KI for LHC experiments and beyond HENP SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB The LHC experiments are preparing for the precision measurements and further discoveries that will be made possible by higher LHC energies from April 2015 (LHC Run2). The need for simulation, data processing and analysis would overwhelm the expected capacity of grid infrastructure computing facilities deployed by the Worldwide LHC Computing Grid (WLCG). To meet this challenge the integration of the opportunistic resources into LHC computing model is highly important. The Tier-1 facility at Kurchatov Institute (NRC-KI) in Moscow is a part of WLCG and it will process, simulate and store up to 10% of total data obtained from ALICE, ATLAS and LHCb experiments. In addition Kurchatov Institute has supercomputers with peak performance 0.12 PFLOPS. The delegation of even a fraction of supercomputing resources to the LHC Computing will notably increase total capacity. In 2014 the development a portal combining a Tier-1 and a supercomputer in Kurchatov Institute was started to provide common interfaces and storage. The portal will be used not only for HENP experiments, but also by other data- and compute-intensive sciences like biology with genome sequencing analysis; astrophysics with cosmic rays analysis, antimatter and dark matter search, etc. C1 [Belyaev, A.; Berezhnaya, A.; Drizhuk, D.; Klimentov, A.; Lazin, Y.; Lyalin, I.; Mashinistov, R.; Novikov, A.; Polyakov, A.; Poyda, A.; Ryabinkin, E.; Teslyuk, A.; Tkachenko, I.; Yasnopolskiy, L.] Natl Res Ctr Kurchatov Inst, Moscow, Russia. [Betev, L.; Buncic, P.] CERN, Geneva, Switzerland. [De, K.; Oleynik, D.] Univ Texas Arlington, Arlington, TX 76019 USA. [Klimentov, A.] Brookhaven Natl Lab, Upton, NY 11973 USA. [Mashinistov, R.] Russian Acad Sci, PN Lebedev Phys Inst, Moscow, Russia. [Oleynik, D.] Joint Inst Nucl Res, Dubna, Russia. [Ryabinkin, E.] Moscow Inst Phys & Technol, Moscow, Russia. RP Belyaev, A (reprint author), Natl Res Ctr Kurchatov Inst, Moscow, Russia. EM ruslan.mashinistov@cern.ch RI Mashinistov, Ruslan/M-8356-2015 OI Mashinistov, Ruslan/0000-0001-7925-4676 NR 13 TC 0 Z9 0 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 092018 DI 10.1088/1742-6596/664/9/092018 PG 8 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140603086 ER PT S AU Bernier, J Campana, S Chadwick, K Chudoba, J Dewhurst, A Elias, M Fayer, S Finnern, T Grigoras, C Hartmann, T Hoeft, B Idiculla, T Kelsey, DP Munoz, FL Macmahon, E Martelli, E Millar, AP Nandakumar, R Ohrenberg, K Prelz, F Rand, D Sciaba, A Tigerstedt, U Voicu, R Walker, CJ Wildish, T AF Bernier, J. Campana, S. Chadwick, K. Chudoba, J. Dewhurst, A. Elias, M. Fayer, S. Finnern, T. Grigoras, C. Hartmann, T. Hoeft, B. Idiculla, T. Kelsey, D. P. Lopez Munoz, F. Macmahon, E. Martelli, E. Millar, A. P. Nandakumar, R. Ohrenberg, K. Prelz, F. Rand, D. Sciaba, A. Tigerstedt, U. Voicu, R. Walker, C. J. Wildish, T. GP IOP TI The production deployment of IPv6 on WLCG SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB The world is rapidly running out of IPv4 addresses; the number of IPv6 end systems connected to the internet is increasing; WLCG and the LHC experiments may soon have access to worker nodes and/or virtual machines (VMs) possessing only an IPv6 routable address. The HEPiX IPv6 Working Group has been investigating, testing and planning for dual-stack services on WLCG for several years. Following feedback from our working group, many of the storage technologies in use on WLCG have recently been made IPv6-capable. This paper presents the IPv6 requirements, tests and plans of the LHC experiments together with the tests performed on the group's IPv6 test-bed. This is primarily aimed at IPv6-only worker nodes or VMs accessing several different implementations of a global dual-stack federated storage service. Finally the plans for deployment of production dual-stack WLCG services are presented. C1 [Bernier, J.] IN2P3 Comp Ctr, 21 Ave Pierre de Coubertin, F-69627 Villeurbanne, France. [Campana, S.; Grigoras, C.; Martelli, E.; Sciaba, A.] CERN, CH-1211 Geneva 23, Switzerland. [Chadwick, K.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. [Chudoba, J.; Elias, M.] Acad Sci Czech Republic, Inst Phys, Prague 18221 8, Czech Republic. [Dewhurst, A.; Idiculla, T.; Kelsey, D. P.; Nandakumar, R.] Rutherford Appleton Lab, STFC, Didcot OX11 0QX, Oxon, England. [Fayer, S.; Rand, D.] Univ London Imperial Coll Sci Technol & Med, London SW7 2AZ, England. [Finnern, T.; Millar, A. P.; Ohrenberg, K.] DESY, D-22607 Hamburg, Germany. [Hartmann, T.; Hoeft, B.] Karlsruhe Inst Technol, D-76344 Eggenstein Leopoldshafen, Germany. [Lopez Munoz, F.] Univ Autonoma Barcelona, PIC, Bellaterra, Spain. [Lopez Munoz, F.] CIEMAT, E-28040 Madrid, Spain. [Macmahon, E.] Univ Oxford, Dept Phys, Oxford OX1 3RH, England. [Prelz, F.] Ist Nazl Fis Nucl, Sez Milano, I-20133 Milan, Italy. [Tigerstedt, U.] CSC Tieteen Tietotekniikan Keskus Oy, FI-02101 Espoo, Finland. [Voicu, R.] CALTECH, Pasadena, CA 91125 USA. [Walker, C. J.] Queen Mary Univ London, London E1 4NS, England. [Wildish, T.] Princeton Univ, Princeton, NJ 08544 USA. RP Bernier, J (reprint author), IN2P3 Comp Ctr, 21 Ave Pierre de Coubertin, F-69627 Villeurbanne, France. EM david.kelsey@stfc.ac.uk NR 7 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 052018 DI 10.1088/1742-6596/664/5/052018 PG 8 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140601065 ER PT S AU Bonacorsi, D Diotalevi, T Magini, N Sartirana, A Taze, M Wildish, T AF Bonacorsi, D. Diotalevi, T. Magini, N. Sartirana, A. Taze, M. Wildish, T. GP IOP TI Monitoring data transfer latency in CMS computing operations SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB During the first LHC run, the CMS experiment collected tens of Petabytes of collision and simulated data, which need to be distributed among dozens of computing centres with low latency in order to make efficient use of the resources. While the desired level of throughput has been successfully achieved, it is still common to observe transfer workflows that cannot reach full completion in a timely manner due to a small fraction of stuck files which require operator intervention. For this reason, in 2012 the CMS transfer management system, PhEDEx, was instrumented with a monitoring system to measure file transfer latencies, and to predict the completion time for the transfer of a data set. The operators can detect abnormal patterns in transfer latencies while the transfer is still in progress, and monitor the long-term performance of the transfer infrastructure to plan the data placement strategy. Based on the data collected for one year with the latency monitoring system, we present a study on the different factors that contribute to transfer completion time. As case studies, we analyze several typical CMS transfer workflows, such as distribution of collision event data from CERN or upload of simulated event data from the Tier-2 centres to the archival Tier-1 centres. For each workflow, we present the typical patterns of transfer latencies that have been identified with the latency monitor. We identify the areas in PhEDEx where a development effort can reduce the latency, and we show how we are able to detect stuck transfers which need operator intervention. We propose a set of metrics to alert about stuck subscriptions and prompt for manual intervention, with the aim of improving transfer completion times. C1 [Bonacorsi, D.; Diotalevi, T.] Univ Bologna, I-40126 Bologna, Italy. [Magini, N.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. [Sartirana, A.] Ecole Polytech Paris, Paris, France. [Taze, M.] Cukurova Univ, Adana, Turkey. [Wildish, T.] Princeton Univ, Princeton, NJ 08544 USA. RP Bonacorsi, D (reprint author), Univ Bologna, I-40126 Bologna, Italy. EM Daniele.Bonacorsi@bo.infn.it; Tommaso.Diotalevi@studio.unibo.it; nicolo.magini@cern.ch; sartiran@llr.in2p3.it; meric.taze@cern.ch; Tony.Wildish@cern.ch NR 9 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 032033 DI 10.1088/1742-6596/664/3/032033 PG 9 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140600076 ER PT S AU Bonacorsi, D Boccali, T Giordano, D Girone, M Neri, M Magini, N Kuznetsov, V Wildish, T AF Bonacorsi, D. Boccali, T. Giordano, D. Girone, M. Neri, M. Magini, N. Kuznetsov, V. Wildish, T. GP IOP TI Exploiting CMS data popularity to model the evolution of data management for Run-2 and beyond SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB During the LHC Run-1 data taking, all experiments collected large data volumes from proton-proton and heavy-ion collisions. The collisions data, together with massive volumes of simulated data, were replicated in multiple copies, transferred among various Tier levels, transformed/slimmed in format/content. These data were then accessed (both locally and remotely) by large groups of distributed analysis communities exploiting the WorldWide LHC Computing Grid infrastructure and services. While efficient data placement strategies- together with optimal data redistribution and deletions on demand- have become the core of static versus dynamic data management projects, little effort has so far been invested in understanding the detailed data-access patterns which surfaced in Run-1. These patterns, if understood, can be used as input to simulation of computing models at the LHC, to optimise existing systems by tuning their behaviour, and to explore next-generation CPU/storage/network co-scheduling solutions. This is of great importance, given that the scale of the computing problem will increase far faster than the resources available to the experiments, for Run-2 and beyond. Studying data-access patterns involves the validation of the quality of the monitoring data collected on the "popularity of each dataset, the analysis of the frequency and pattern of accesses to different datasets by analysis end-users, the exploration of different views of the popularity data (by physics activity, by region, by data type), the study of the evolution of Run-1 data exploitation over time, the evaluation of the impact of different data placement and distribution choices on the available network and storage resources and their impact on the computing operations. This work presents some insights from studies on the popularity data from the CMS experiment. We present the properties of a range of physics analysis activities as seen by the data popularity, and make recommendations for how to tune the initial distribution of data in anticipation of how it will be used in Run-2 and beyond. C1 [Bonacorsi, D.; Neri, M.] Univ Bologna, I-40126 Bologna, Italy. [Boccali, T.] INFN Pisa, Pisa, Italy. [Giordano, D.; Girone, M.; Magini, N.] CERN, CH-1211 Geneva 23, Switzerland. Fermilab Natl Accelerator Lab, Batavia, IL USA. [Kuznetsov, V.] Cornell Univ, Ithaca, NY 14853 USA. [Wildish, T.] Princeton Univ, Princeton, NJ 08544 USA. RP Bonacorsi, D (reprint author), Univ Bologna, I-40126 Bologna, Italy. EM Daniele.Bonacorsi@bo.infn.it NR 12 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 032003 DI 10.1088/1742-6596/664/3/032003 PG 9 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140600046 ER PT S AU Borissov, G Casper, D Grimm, K Griso, SP Pedersen, LE Prokofiev, K Rudolph, M Wharton, A AF Borissov, G. Casper, D. Grimm, K. Griso, S. Pagan Pedersen, L. Egholm Prokofiev, K. Rudolph, M. Wharton, A. CA ATLAS Collaboration GP IOP TI ATLAS strategy for primary vertex reconstruction during Run-2 of the LHC SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB The reconstruction of vertices corresponding to proton proton collisions in ATLAS is an essential element of event reconstruction used in many performance studies and physics analyses. During Run-1 of the LHC, ATLAS has employed an iterative approach to vertex finding. In order to improve the flexibility of the algorithm and ensure continued performance for very high numbers of simultaneous collisions in Run-2 of the LHC and beyond, a new approach to seeding vertex finding has been developed inspired by image reconstruction techniques. This note provides a brief outline of how reconstructed tracks are used to create an image of likely vertex collisions in an event, describes the implementation in the ATLAS software, and presents some preliminary results of the performance of the algorithm in simulation approximating early Run-2 conditions. C1 [Borissov, G.; Grimm, K.; Wharton, A.] Univ Lancaster, Lancaster LA1 4YW, England. [Casper, D.] Univ Calif Irvine, Irvine, CA USA. [Griso, S. Pagan] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. [Griso, S. Pagan] Univ Calif Berkeley, Berkeley, CA 94720 USA. [Pedersen, L. Egholm] Univ Copenhagen, NBI, DK-1168 Copenhagen, Denmark. [Prokofiev, K.] Hong Kong Univ Sci & Technol, Hong Kong, Hong Kong, Peoples R China. [Rudolph, M.] Univ Toronto, Toronto, ON M5S 1A1, Canada. RP Borissov, G (reprint author), Univ Lancaster, Lancaster LA1 4YW, England. EM matthew.scott.rudolph@cern.ch OI Prokofiev, Kirill/0000-0002-2177-6401 NR 19 TC 0 Z9 0 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 072041 DI 10.1088/1742-6596/664/7/072041 PG 8 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140602099 ER PT S AU Borodin, M De, K Navarro, JG Golubkov, D Klimentov, A Maeno, T Vaniachine, A AF Borodin, M. De, K. Garcia Navarro, J. Golubkov, D. Klimentov, A. Maeno, T. Vaniachine, A. CA ATLAS Collaboration GP IOP TI Scaling up ATLAS production system for the LHC Run 2 and beyond: project ProdSys2 SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB The Big Data processing needs of the ATLAS experiment grow continuously, as more data and more use cases emerge. For Big Data processing the ATLAS experiment adopted the data transformation approach, where software applications transform the input data into outputs. In the ATLAS production system, each data transformation is represented by a task, a collection of many jobs, submitted by the ATLAS workload management system (PanDA) and executed on the Grid. Our experience shows that the rate of task submission grows exponentially over the years. To scale up the ATLAS production system for new challenges, we started the ProdSys2 project. PanDA has been upgraded with the Job Execution and Definition Interface (JEDI). Patterns in ATLAS data transformation workflows composed of many tasks provided a scalable production system framework for template definitions of the many-tasks workflows. These workflows are being implemented in the Database Engine for Tasks (DEfT) that generates individual tasks for processing by JEDI. We report on the ATLAS experience with many-task workflow patterns in preparation for the LHC Run 2. C1 [Borodin, M.; Golubkov, D.] Natl Res Ctr, Kurchatov Inst, Big Data Lab, Moscow, Russia. [Borodin, M.] Natl Res Nucl Univ MEPhI, Dept Elementary Particle Phys, Moscow, Russia. [De, K.] Univ Texas Arlington, Dept Phys, Arlington, TX 76019 USA. [Garcia Navarro, J.] Univ Valencia, Inst Fis Corpuscular, E-46003 Valencia, Spain. [Golubkov, D.] Inst High Energy Phys, Expt Phys Dept, Protvino 142281, Russia. [Klimentov, A.; Maeno, T.] Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. [Vaniachine, A.] Argonne Natl Lab, Div High Energy Phys, Argonne, IL 60439 USA. RP Borodin, M (reprint author), Natl Res Ctr, Kurchatov Inst, Big Data Lab, Moscow, Russia. EM aak@bnl.gov NR 12 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 062005 DI 10.1088/1742-6596/664/6/062005 PG 8 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140601095 ER PT S AU Box, D Boyd, J Dykstra, D Garzoglio, G Herner, K Kirby, M Kreymer, A Levshina, T Mhashilkar, P Sharma, N AF Box, Dennis Boyd, Joseph Dykstra, Dave Garzoglio, Gabriele Herner, Kenneth Kirby, Michael Kreymer, Arthur Levshina, Tanya Mhashilkar, Parag Sharma, Neha GP IOP TI Progress on the FabrIc for Frontier Experiments Project at Fermilab SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB The FabrIc for Frontier Experiments (FIFE) project is an ambitious, major-impact initiative within the Fermilab Scientific Computing Division designed to lead the computing model for Fermilab experiments. FIFE is a collaborative effort between experimenters and computing professionals to design and develop integrated computing models for experiments of varying needs and infrastructure. The major focus of the FIFE project is the development, deployment, and integration of Open Science Grid solutions for high throughput computing, data management, database access and collaboration within experiment. To accomplish this goal, FIFE has developed workflows that utilize Open Science Grid sites along with dedicated and commercial cloud resources. The FIFE project has made significant progress integrating into experiment computing operations several services including new job submission services, software and reference data distribution through CVMFS repositories, flexible data transfer client, and access to opportunistic resources on the Open Science Grid. The progress with current experiments and plans for expansion with additional projects will be discussed. FIFE has taken a leading role in the definition of the computing model for Fermilab experiments, aided in the design of computing for experiments beyond Fermilab, and will continue to define the future direction of high throughput computing for future physics experiments worldwide. C1 [Box, Dennis; Boyd, Joseph; Dykstra, Dave; Garzoglio, Gabriele; Herner, Kenneth; Kirby, Michael; Kreymer, Arthur; Levshina, Tanya; Mhashilkar, Parag; Sharma, Neha] Fermilab Natl Accelerator Lab, Div Comp Sci, Batavia, IL 60510 USA. RP Box, D (reprint author), Fermilab Natl Accelerator Lab, Div Comp Sci, Batavia, IL 60510 USA. EM dbox@fnal.gov; boyd@fnal.gov; dwd@fnal.gov; garzoglio@fnal.gov; kherner@fnal.gov; kirby@fnal.gov; kreymer@fnal.gov; tlevshin@fnal.gov; parag@fnal.gov; neha@fnal.gov NR 10 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 062040 DI 10.1088/1742-6596/664/6/062040 PG 8 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140602030 ER PT S AU Boyd, J Herner, K Jayatilaka, B Roser, R Sakumoto, W AF Boyd, J. Herner, K. Jayatilaka, B. Roser, R. Sakumoto, W. GP IOP TI Data preservation at the Fermilab Tevatron SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB The Fermilab Tevatron collider's data-taking run ended in September 2011, yielding a dataset with rich scientific potential. The CDF and DO experiments each have nearly 9 PB of collider and simulated data stored on tape. A large computing infrastructure consisting of tape storage, disk cache, and distributed grid computing for physics analysis with the Tevatron data is present at Fermilab. The Fermilab Run II data preservation project intends to keep this analysis capability sustained through the year 2020 or beyond. To achieve this, we are implementing a system that utilizes virtualization, automated validation, and migration to new standards in both software and data storage technology as well as leveraging resources available from currently-running experiments at Fermilab. These efforts will provide useful lessons in ensuring long-term data access for numerous experiments throughout high-energy physics, and provide a roadmap for high-quality scientific output for years to come. C1 [Boyd, J.; Herner, K.; Jayatilaka, B.; Roser, R.; Sakumoto, W.] Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. RP Boyd, J (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM boj@fnal.gov NR 4 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 032015 DI 10.1088/1742-6596/664/3/032015 PG 5 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140600058 ER PT S AU Bridle, S Dodelson, S Jennings, E Kowalkowski, J Manzotti, A Paterno, M Rudd, D Sehrish, S Zuntz, J AF Bridle, S. Dodelson, S. Jennings, E. Kowalkowski, J. Manzotti, A. Paterno, M. Rudd, D. Sehrish, S. Zuntz, J. GP IOP TI CosmoSIS: a system for MC parameter estimation SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB CosmoSIS is a modular system for cosmological parameter estimation, based on Markov Chain Monte Carlo and related techniques. It provides a series of samplers, which drive the exploration of the parameter space, and a series of modules, which calculate the likelihood of the observed data for a given physical model, determined by the location of a sample in the parameter space. While CosmoSIS ships with a set of modules that calculate quantities of interest to cosmologists, there is nothing about the framework itself, nor in the Markov Chain Monte Carlo technique, that is specific to cosmology. Thus CosmoSIS could be used for parameter estimation problems in other fields, including HEP. This paper describes the features of CosmoSIS and show an example of its use outside of cosmology. It also discusses how collaborative development strategies differ between two different communities: that of HEP physicists, accustomed to working in large collaborations, and that of cosmologists, who have traditionally not worked in large groups. C1 [Bridle, S.; Zuntz, J.] Univ Manchester, Jodrell Bank Ctr Astrophys, Manchester M13 9PL, Lancs, England. [Dodelson, S.; Kowalkowski, J.; Paterno, M.; Sehrish, S.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. [Dodelson, S.; Jennings, E.; Manzotti, A.; Rudd, D.] Univ Chicago, Kavli Inst Cosmol Phys, Chicago, IL 60637 USA. [Jennings, E.] Univ Chicago, Enrico Fermi Inst, Chicago, IL 60637 USA. [Rudd, D.] Univ Chicago, Ctr Res Comp, Chicago, IL 60637 USA. [Dodelson, S.; Manzotti, A.] Univ Chicago, Dept Astron & Astrophys, Chicago, IL 60637 USA. RP Bridle, S (reprint author), Univ Manchester, Jodrell Bank Ctr Astrophys, Manchester M13 9PL, Lancs, England. EM paterno@fnal.gov NR 2 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 072036 DI 10.1088/1742-6596/664/7/072036 PG 8 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140602094 ER PT S AU Buckley, A Eifert, T Elsing, M Gillberg, D Koeneke, K Krasznahorkay, A Moyse, E Nowak, M Snyder, S van Gemmeren, P AF Buckley, A. Eifert, T. Elsing, M. Gillberg, D. Koeneke, K. Krasznahorkay, A. Moyse, E. Nowak, M. Snyder, S. van Gemmeren, P. CA ATLAS Collaboration GP IOP TI Implementation of the ATLAS Run 2 event data model SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB During the 2013-2014 shutdown of the Large Hadron Collider, ATLAS switched to a new event data model for analysis, called the xAOD. A key feature of this model is the separation of the object data from the objects themselves (the 'auxiliary store'). Rather than being stored as member variables of the analysis classes, all object data are stored separately, as vectors of simple values. Thus, the data are stored in a 'structure of arrays' format, while the user still can access it as an 'array of structures'. This organization allows for on-demand partial reading of objects, the selective removal of object properties, and the addition of arbitrary user defined properties in a uniform manner. It also improves performance by increasing the locality of memory references in typical analysis code. The resulting data structures can be written to ROOT files with data properties represented as simple ROOT tree branches. This paper focuses on the design and implementation of the auxiliary store and its interaction with ROOT. C1 [Buckley, A.] Univ Glasgow, Dept Phys & Astron, Glasgow G12 8QQ, Lanark, Scotland. [Eifert, T.; Elsing, M.; Gillberg, D.; Krasznahorkay, A.] CERN, CH-1211 Geneva 23, Switzerland. [Koeneke, K.] Univ Freiburg, Fak Math & Phys, D-79104 Freiburg, Germany. [Moyse, E.] Univ Massachusetts, Dept Phys, Amherst, MA 01003 USA. [Nowak, M.; Snyder, S.] Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. [van Gemmeren, P.] Argonne Natl Lab, Div High Energy Phys, Argonne, IL 60439 USA. RP Buckley, A (reprint author), Univ Glasgow, Dept Phys & Astron, Glasgow G12 8QQ, Lanark, Scotland. EM snyder@bnl.gov NR 4 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 072045 DI 10.1088/1742-6596/664/7/072045 PG 8 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140603004 ER PT S AU Calafiura, P Lampl, W Leggett, C Malon, D Stewart, G Wynne, B AF Calafiura, P. Lampl, W. Leggett, C. Malon, D. Stewart, G. Wynne, B. GP IOP TI Development of a Next Generation Concurrent Framework for the ATLAS Experiment SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB The ATLAS experiment has successfully used its Gaudi/Athena software framework for data taking and analysis during the first LHC run, with billions of events successfully processed. However, the design of Gaudi/Athena dates from early 2000 and the software and the physics code has been written using a single threaded, serial design. This programming model has increasing difficulty in exploiting the potential of current CPUs, which offer their best performance only through taking full advantage of multiple cores and wide vector registers. Future CPU evolution will intensify this trend, with core counts increasing and memory per core falling. With current memory consumption for 64 bit ATLAS reconstruction in a high luminosity environment approaching 4GB, it will become impossible to fully occupy all cores in a machine without exhausting available memory. However, since maximizing performance per watt will be a key metric, a mechanism must be found to use all cores as efficiently as possible. In this paper we report on our progress with a practical demonstration of the use of multi-threading in the ATLAS reconstruction software, using the GaudiHive framework. We have expanded support to Calorimeter, Inner Detector, and Tracking code, discussing what changes were necessary in order to allow the serially designed ATLAS code to run, both to the framework and to the tools and algorithms used. We report on both the performance gains, and what general lessons were learned about the code patterns that had been employed in the software and which patterns were identified as particularly problematic for multi-threading. We also present our findings on implementing a hybrid multi-threaded / multi-process framework, to take advantage of the strengths of each type of concurrency, while avoiding some of their corresponding limitations. C1 [Calafiura, P.; Leggett, C.] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, 1 Cyclotron Rd, Berkeley, CA 94720 USA. [Lampl, W.] CERN, CH-1211 Geneva 23, Switzerland. [Malon, D.] Argonne Natl Lab, Argonne, IL 60439 USA. RP Calafiura, P (reprint author), Univ Calif Berkeley, Lawrence Berkeley Natl Lab, 1 Cyclotron Rd, Berkeley, CA 94720 USA. EM cgleggett@lbl.gov NR 3 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 072031 DI 10.1088/1742-6596/664/7/072031 PG 7 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140602089 ER PT S AU Calafiura, P De, K Guan, W Maeno, T Nilsson, P Oleynik, D Panitkin, S Tsulaia, V Van Gemmeren, P Wenaus, T AF Calafiura, P. De, K. Guan, W. Maeno, T. Nilsson, P. Oleynik, D. Panitkin, S. Tsulaia, V. Van Gemmeren, P. Wenaus, T. CA ATLAS Collaboration GP IOP TI The ATLAS Event Service: A new approach to event processing SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB The ATLAS Event Service (ES) implements a new fine grained approach to HEP event processing, designed to be agile and efficient in exploiting transient, short-lived resources such as HPC hole-filling, spot market commercial clouds, and volunteer computing. Input and output control and data flows, bookkeeping, monitoring, and data storage are all managed at the event level in an implementation capable of supporting ATLAS-scale distributed processing throughputs (about 4M CPU-hours/day). Input data flows utilize remote data repositories with no data locality or pre-staging requirements, minimizing the use of costly storage in favor of strongly leveraging powerful networks. Object stores provide a highly scalable means of remotely storing the quasi-continuous, fine grained outputs that give ES based applications a very light data footprint on a processing resource, and ensure negligible losses should the resource suddenly vanish. We will describe the motivations for the ES system, its unique features and capabilities, its architecture and the highly scalable tools and technologies employed in its implementation, and its applications in ATLAS processing on HPCs, commercial cloud resources, volunteer computing, and grid resources. C1 [Calafiura, P.; Tsulaia, V.] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, 1 Cyclotron Rd, Berkeley, CA 94720 USA. [De, K.; Oleynik, D.] Univ Texas Arlington, Arlington, TX 76019 USA. [Guan, W.] Univ Wisconsin, Madison, WI 53706 USA. [Maeno, T.; Nilsson, P.; Panitkin, S.; Wenaus, T.] Brookhaven Natl Lab, Upton, NY 11973 USA. [Van Gemmeren, P.] Argonne Natl Lab, Lemont, IL 60439 USA. RP Calafiura, P (reprint author), Univ Calif Berkeley, Lawrence Berkeley Natl Lab, 1 Cyclotron Rd, Berkeley, CA 94720 USA. EM wenaus@gmail.com NR 12 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 062065 DI 10.1088/1742-6596/664/6/062065 PG 7 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140602055 ER PT S AU Calafiura, P De, K Guan, W Maeno, T Nilsson, P Oleynik, D Panitkin, S Tsulaia, V Van Gemmeren, P Wenaus, T AF Calafiura, Paolo De, Kaushik Guan, Wen Maeno, Tadashi Nilsson, Paul Oleynik, Danila Panitkin, Sergey Tsulaia, Vakhtang Van Gemmeren, Peter Wenaus, Torre CA ATLAS Collaboration GP IOP TI Fine grained event processing on HPCs with the ATLAS Yoda system SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB High performance computing facilities present unique challenges and opportunities for HEP event processing. The massive scale of many HPC systems means that fractionally small utilization can yield large returns in processing throughput. Parallel applications which can dynamically and efficiently fill any scheduling opportunities the resource presents benefit both the facility (maximal utilization) and the (compute-limited) science. The ATLAS Yoda system provides this capability to HEP-like event processing applications by implementing event-level processing in an MPI-based master-client model that integrates seamlessly with the more broadly scoped ATLAS Event Service. Fine grained, event level work assignments are intelligently dispatched to parallel workers to sustain full utilization on all cores, with outputs streamed off to destination object stores in near real time with similarly fine granularity, such that processing can proceed until termination with full utilization. The system offers the efficiency and scheduling flexibility of preemption without requiring the application actually support or employ check-pointing. We will present the new Yoda system, its motivations, architecture, implementation, and applications in ATLAS data processing at several US HPC centers. C1 [Calafiura, Paolo; Tsulaia, Vakhtang] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, 1 Cyclotron Rd, Berkeley, CA 94720 USA. [De, Kaushik; Oleynik, Danila] Univ Texas Arlington, Arlington, TX 76019 USA. [Guan, Wen] Univ Wisconsin, Madison, WI 53706 USA. [Maeno, Tadashi; Nilsson, Paul; Panitkin, Sergey; Wenaus, Torre] Brookhaven Natl Lab, Upton, NY 11973 USA. [Van Gemmeren, Peter] Argonne Natl Lab, Argonne, IL 60439 USA. RP Calafiura, P (reprint author), Univ Calif Berkeley, Lawrence Berkeley Natl Lab, 1 Cyclotron Rd, Berkeley, CA 94720 USA. EM VTsulaia@lbl.gov NR 7 TC 0 Z9 0 U1 1 U2 2 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 092025 DI 10.1088/1742-6596/664/9/092025 PG 5 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140603093 ER PT S AU Calafiura, P Leggett, C Seuster, R Tsulaia, V Van Gemmeren, P AF Calafiura, Paolo Leggett, Charles Seuster, Rolf Tsulaia, Vakhtang Van Gemmeren, Peter CA ATLAS Collaboration GP IOP TI Running ATLAS workloads within massively parallel distributed applications using Athena Multi-Process framework (AthenaMP) SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB AthenaMP is a multi-process version of the ATLAS reconstruction, simulation and data analysis framework Athena. By leveraging Linux fork and copy-on-write mechanisms, it allows for sharing of memory pages between event processors running on the same compute node with little to no change in the application code. Originally targeted to optimize the memory footprint of reconstruction jobs, AthenaMP has demonstrated that it can reduce the memory usage of certain configurations of ATLAS production jobs by a factor of 2. AthenaMP has also evolved to become the parallel event-processing core of the recently developed ATLAS infrastructure for fine-grained event processing (Event Service) which allows the running of AthenaMP inside massively parallel distributed applications on hundreds of compute nodes simultaneously. We present the architecture of AthenaMP, various strategies implemented by AthenaMP for scheduling workload to worker processes (for example: Shared Event Queue and Shared Distributor of Event Tokens) and the usage of AthenaMP in the diversity of ATLAS event processing workloads on various computing resources: Grid, opportunistic resources and HPC. C1 [Calafiura, Paolo; Leggett, Charles; Tsulaia, Vakhtang] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, 1 Cyclotron Rd, Berkeley, CA 94720 USA. [Seuster, Rolf] TRIUMF, Vancouver, BC V6T 2A3, Canada. [Van Gemmeren, Peter] Argonne Natl Lab, Argonne, IL 60439 USA. RP Calafiura, P (reprint author), Univ Calif Berkeley, Lawrence Berkeley Natl Lab, 1 Cyclotron Rd, Berkeley, CA 94720 USA. EM VTsulaia@lbl.gov NR 9 TC 0 Z9 0 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 072050 DI 10.1088/1742-6596/664/7/072050 PG 7 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140603009 ER PT S AU Calderon, A Colling, D Huffman, A Lassila-Perini, K McCauley, T Rao, A Rodriguez-Marrero, A Sexton-Kennedy, E AF Calderon, A. Colling, D. Huffman, A. Lassila-Perini, K. McCauley, T. Rao, A. Rodriguez-Marrero, A. Sexton-Kennedy, E. GP IOP TI Open access to high-level data and analysis tools in the CMS experiment at the LHC SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB The CMS experiment, in recognition of its commitment to data preservation and open access as well as to education and outreach, has made its first public release of high-level data under the CC0 waiver: up to half of the proton-proton collision data (by volume) at 7 TeV from 2010 in CMS Analysis Object Data format. CMS has prepared, in collaboration with CERN and the other LHC experiments, an open-data web portal based on Invenio. The portal provides access to CMS public data as well as to analysis tools and documentation for the public. The tools include an event display and histogram application that run in the browser. In addition a virtual machine containing a CMS software environment along with XRootD access to the data is available. Within the virtual machine the public can analyse CMS data; example code is provided. We describe the accompanying tools and documentation and discuss the first experiences of data use. C1 [Calderon, A.; Rodriguez-Marrero, A.] Univ Cantabria, CSIC, IFCA, E-39005 Santander, Spain. [Colling, D.; Huffman, A.] Univ London Imperial Coll Sci Technol & Med, Dept Phys, London, England. [Lassila-Perini, K.] Helsinki Inst Phys, Helsinki, Finland. [McCauley, T.] Univ Notre Dame, Notre Dame, IN 46556 USA. [Rao, A.] Univ W England, Bristol BS16 1QY, Avon, England. [Sexton-Kennedy, E.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Calderon, A (reprint author), Univ Cantabria, CSIC, IFCA, E-39005 Santander, Spain. EM k.lassila-perini@cern.ch OI Rao, Achintya/0000-0002-1628-2618 NR 12 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 032027 DI 10.1088/1742-6596/664/3/032027 PG 7 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140600070 ER PT S AU Caramarcu, C Hollowell, C Rao, T Strecker-Kellogg, W Wong, A Zaytsev, A AF Caramarcu, C. Hollowell, C. Rao, T. Strecker-Kellogg, W. Wong, A. Zaytsev, A. GP IOP TI Mean PB To Failure - Initial results from a long-term study of disk storage patterns at the RACF SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB The RACF (RHIC-ATLAS Computing Facility) has operated a large, multi-purpose dedicated computing facility since the mid-1990's, serving a worldwide, geographically diverse scientific community that is a major contributor to various HEPN projects. A central component of the RACF is the Linux-based worker node cluster that is used for both computing and data storage purposes. It currently has nearly 50,000 computing cores and over 23 PB of storage capacity distributed over 12,000+ (non-SSD) disk drives. The majority of the 12,000+ disk drives provide a cost-effective solution for dCache/XRootD-managed storage, and a key concern is the reliability of this solution over the lifetime of the hardware, particularly as the number of disk drives and the storage capacity of individual drives grow. We report initial results of a long-term study to measure lifetime PB read/written to disk drives in the worker node cluster. We discuss the historical disk drive mortality rate, disk drive manufacturers' published MPTF (Mean PB to Failure) data and how they are correlated to our results. The results help the RACF understand the productivity and reliability of its storage solutions and have implications for other highly-available storage systems (NFS, GPFS, CVMFS, etc) with large I/O requirements. C1 [Caramarcu, C.; Hollowell, C.; Rao, T.; Strecker-Kellogg, W.; Wong, A.; Zaytsev, A.] Brookhaven Natl Lab, Dept Phys, POB 5000, Upton, NY 11973 USA. RP Wong, A (reprint author), Brookhaven Natl Lab, Dept Phys, POB 5000, Upton, NY 11973 USA. EM tony@bnl.gov NR 2 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 042057 DI 10.1088/1742-6596/664/4/042057 PG 6 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140601046 ER PT S AU Catmore, J Cranshaw, J Gillam, T Gramstad, E Laycock, P Ozturk, N Stewart, GA AF Catmore, James Cranshaw, Jack Gillam, Thomas Gramstad, Eirik Laycock, Paul Ozturk, Nurcan Stewart, Graeme Andrew CA ATLAS Collaboration GP IOP TI A new petabyte-scale data derivation framework for ATLAS SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB During the Long Shutdown of the LHC, the ATLAS collaboration overhauled its analysis model based on experience gained during Run 1. A significant component of the model is a "Derivation Framework" that takes the petabyte-scale AOD output from ATLAS reconstruction and produces samples, typically terabytes in size, targeted at specific analyses. The framework incorporates all of the functionality of the core reconstruction software, while producing outputs that are simply configured. Event selections are specified via a concise domain-specific language, including support for logical operations. The output content can be highly optimised to minimise disk requirements, while maintaining the same C++ interface. The framework includes an interface to the late-stage physics analysis tools, ensuring that the final outputs are consistent with tool requirements. Finally, the framework allows several outputs to be produced for the same input, providing the possibility to optimise configurations to computing resources. C1 [Catmore, James; Gramstad, Eirik] Univ Oslo, Fysikkbygningen, POB 1048 Blindern, N-0316 Oslo, Norway. [Cranshaw, Jack] Argonne Natl Lab, Argonne, IL 60439 USA. [Gillam, Thomas] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England. [Laycock, Paul] Univ Liverpool, Oliver Lodge Lab, Liverpool L69 7ZE, Merseyside, England. [Ozturk, Nurcan] Univ Texas Arlington, Arlington, TX 76019 USA. [Stewart, Graeme Andrew] Univ Glasgow, Sch Phys & Astron, Glasgow G12 8QQ, Lanark, Scotland. RP Catmore, J (reprint author), Univ Oslo, Fysikkbygningen, POB 1048 Blindern, N-0316 Oslo, Norway. EM james.catmore@cern.ch NR 6 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 072007 DI 10.1088/1742-6596/664/7/072007 PG 7 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140602065 ER PT S AU Childers, JT Uram, TD LeCompte, TJ Papka, ME Benjamin, DP AF Childers, J. T. Uram, T. D. LeCompte, T. J. Papka, M. E. Benjamin, D. P. GP IOP TI Simulation of LHC events on a millions threads SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB Demand for Grid resources is expected to double during LHC Run II as compared to Run I; the capacity of the Grid, however, will not double. The HEP community must consider how to bridge this computing gap by targeting larger compute resources and using the available compute resources as efficiently as possible. Argonne's Mira, the fifth fastest supercomputer in the world, can run roughly five times the number of parallel processes that the ATLAS experiment typically uses on the Grid. We ported Alpgen, a serial x86 code, to run as a parallel application under MPI on the Blue Gene/Q architecture. By analysis of the Alpgen code, we reduced the memory footprint to allow running 64 threads per node, utilizing the four hardware threads available per core on the PowerPC A2 processor. Event generation and unweighting, typically run as independent serial phases, are coupled together in a single job in this scenario, reducing intermediate writes to the filesystem. By these optimizations, we have successfully run LHC proton-proton physics event generation at the scale of a million threads, filling two-thirds of Mira. C1 [Childers, J. T.; Uram, T. D.; LeCompte, T. J.; Papka, M. E.] Argonne Natl Lab, Lemont, IL USA. [Papka, M. E.] No Illinois Univ, De Kalb, IL 60115 USA. [Benjamin, D. P.] Duke Univ, Durham, NC USA. RP Childers, JT (reprint author), Argonne Natl Lab, Lemont, IL USA. EM jchilders@anl.gov NR 3 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 092006 DI 10.1088/1742-6596/664/9/092006 PG 6 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140603074 ER PT S AU Davies, GS Davies, JP Group, C Rebel, B Sachdev, K Zirnstein, J AF Davies, G. S. Davies, J. P. Group, C. Rebel, B. Sachdev, K. Zirnstein, J. GP IOP TI Software Management for the NOvAExperiment SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB The NOvAsoftware (NOvASoft) is written in C++, and built on the Fermilab Computing Division's art framework that uses ROOT analysis software. NOvASoftmakes use of more than 50 external software packages, is developed by more than 50 developers and is used by more than 100 physicists from over 30 universities and laboratories in 3 continents. The software builds are handled by Fermilab's custom version of Software Release Tools (SRT), a UNIX based software management system for large, collaborative projects that is used by several experiments at Fermilab. The system provides software version control with SVN configured in a client-server mode and is based on the code originally developed by the BaBar collaboration. In this paper, we present efforts towards distributing the NOvA software via the CernVM File System distributed file system. We will also describe our recent work to use a CMake build system and Jenkins, the open source continuous integration system, for NOvASoft. C1 [Davies, G. S.] Indiana Univ, Dept Phys, Swain Hall West,Room 117,727 E Third St, Bloomington, IN 47405 USA. [Davies, J. P.] Univ Sussex, Dept Phys & Astron, Brighton BN1 9RH, E Sussex, England. [Group, C.] Univ Virginia, Dept Phys, Charlottesville, VA 22904 USA. [Rebel, B.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. [Sachdev, K.; Zirnstein, J.] Univ Minnesota, Sch Phys & Astron, Minneapolis, MN 55455 USA. RP Davies, GS (reprint author), Indiana Univ, Dept Phys, Swain Hall West,Room 117,727 E Third St, Bloomington, IN 47405 USA. EM gsdavies@iu.edu; j.p.davies@sussex.ac.edu; rcg6p@virginia.edu; brebel@fnal.gov; ksachdev@physics.umn.edu; zirnstein@physics.umb.edu NR 4 TC 0 Z9 0 U1 1 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 062011 DI 10.1088/1742-6596/664/6/062011 PG 5 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140602001 ER PT S AU De, K Klimentov, A Oleynik, D Panitkin, S Petrosyan, A Schovancova, J Vaniachine, A Wenaus, T AF De, K. Klimentov, A. Oleynik, D. Panitkin, S. Petrosyan, A. Schovancova, J. Vaniachine, A. Wenaus, T. CA ATLAS Collaboration GP IOP TI Integration of PanDA workload management system with Titan supercomputer at OLCF SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB The PanDA (Production and Distributed Analysis) workload inanagement system (VMS) was developed to meet the scale and complexity of LHC distributed computing for the ATLAS experiment. While PanDA currently distributes jobs to more than 100,000 cores at well over 100 Grid sites, the future LHC data taking runs will require more resources than Grid computing can possibly provide. To alleviate these challenges, ATLAS is engaged in au ambitiot is program to expand the current computing model to include additional resources such as the opportunistic use of supercomputers. We will describe a project aimed at integration of PanDA WAlS with Titan supercomputer at Oak Ridge Leadership Computing Facility (OLCF). The current approach utilizes a modified PanDA pilot framework for job submission to Titan's batch queues and local data management, with light-weight MPI wrappers to run single threaded workloads in parallel on Titan's multi core worker nodes. It also gives PanDA new capability to collect, in real time, information about unused worker nodes on Titan, which allows precise definition of the size and duration of jobs submitted to Titan according to available free resources. This capability significantly reduces PanDA job wait time while improving Titan's utilization efficiency. This implementation was tested with a variety of Monte-Carlo workloads on Titan and is being tested on several other supercomputing platforms. C1 [De, K.; Oleynik, D.; Petrosyan, A.] Univ Texas Arlington, Dept Phys, Arlington, TX 76019 USA. [Klimentov, A.; Panitkin, S.; Schovancova, J.; Wenaus, T.] Brookhaven Natl Lab, Upton, NY 10573 USA. [Vaniachine, A.] Argonne Natl Lab, Argonne, IL 60439 USA. RP De, K (reprint author), Univ Texas Arlington, Dept Phys, Arlington, TX 76019 USA. NR 12 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 092020 DI 10.1088/1742-6596/664/9/092020 PG 8 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140603088 ER PT S AU De, K Klimentov, A Maeno, T Nilsson, P Oleynik, D Panitkin, S Petrosyan, A Schovancova, J Vaniachine, A Wenaus, T AF De, K. Klimentov, A. Maeno, T. Nilsson, P. Oleynik, D. Panitkin, S. Petrosyan, A. Schovancova, J. Vaniachine, A. Wenaus, T. CA ATLAS Collaboration GP IOP TI The future of PanDA in ATLAS distributed computing SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB Experiments at the Large Hadron Collider (LHC) face unprecedented computing challenges. Heterogeneous resources are distributed worldwide at hundreds of sites, thousands of physicists analyse the data remotely, the volume of processed data is beyond the exabyte scale, while data processing requires more than a few billion hours of computing usage per year. The PanDA (Production and Distributed Analysis) system was developed to meet the scale and complexity of LHC distributed computing for the ATLAS experiment. In the process, the old batch job paradigm of locally managed computing in HEP was discarded in favour of a far more automated, flexible and scalable model. The success of PanDA in ATLAS is leading to widespread adoption and testing by other experiments. PanDA is the first exascale workload management system in HEP, already operating at more than a million computing jobs per day, and processing over an exabyte of data in 2013. There are many new challenges that PanDA will face in the near future, in addition to new challenges of scale, heterogeneity and increasing user base. PanDA will need to handle rapidly changing computing infrastructure, will require factorization of code for easier deployment, will need to incorporate additional information sources including network metrics in decision making, be able to control network circuits, handle dynamically sized workload processing, provide improved visualization, and face many other challenges. In this talk we will focus on the new features, planned or recently implemented, that are relevant to the next decade of distributed computing workload management using PanDA. C1 [De, K.; Oleynik, D.; Schovancova, J.] Univ Texas Arlington, Arlington, TX 76019 USA. [Klimentov, A.; Maeno, T.; Nilsson, P.; Panitkin, S.; Wenaus, T.] Brookhaven Natl Lab, Upton, NY 11973 USA. [Petrosyan, A.] Joint Inst Nucl Res, Dubna, RU, Russia. [Vaniachine, A.] Argonne Natl Lab, Argonne, IL 60439 USA. RP De, K (reprint author), Univ Texas Arlington, Arlington, TX 76019 USA. EM tmaeno@bnl.gov NR 10 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 062035 DI 10.1088/1742-6596/664/6/062035 PG 7 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140602025 ER PT S AU Di Guida, S Govi, G Ojeda, M Pfeiffer, A Sipos, R AF Di Guida, S. Govi, G. Ojeda, M. Pfeiffer, A. Sipos, R. CA CMS Collaboration GP IOP TI The CMS Condition Database System SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB The Condition Database plays a key role in the CMS computing infrastructure. The complexity of the detector and the variety of the sub-systems involved are setting tight requirements for handling the Conditions. In the last two years the collaboration has put a substantial effort in the re-design of the Condition Database system, with the aim at improving the scalability and the operability for the data taking starting in 2015. The re-design has focused on simplifying the architecture, using the lessons learned during the operation of the Run I data-taking period (20092013). In the new system the relational features of the database schema are mainly exploited to handle the metadata (Tag and Interval of Validity), allowing for a limited and controlled set of queries. The bulk condition data (Payloads) are stored as unstructured binary data, allowing the storage in a single table with a common layout for all of the condition data types. In this paper, we describe the full architecture of the system, including the services implemented for uploading payloads and the tools for browsing the database. Furthermore, the implementation choices for the core software will be discussed. C1 [Di Guida, S.] Univ Guglielmo Marconi, Rome, Italy. [Govi, G.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. [Ojeda, M.; Pfeiffer, A.] CERN, Geneva, Switzerland. [Sipos, R.] Eotvos Lorand Univ, Budapest, Hungary. RP Di Guida, S (reprint author), Univ Guglielmo Marconi, Rome, Italy. EM giacomo.govi@cern.ch NR 4 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 042024 DI 10.1088/1742-6596/664/4/042024 PG 6 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140601013 ER PT S AU Di Guida, S Govi, G Ojeda, M Pfeiffer, A Sipos, R AF Di Guida, Salvatore Govi, Giacomo Ojeda, Miguel Pfeiffer, Andreas Sipos, Roland CA CMS Collaboration GP IOP TI Multi-threaded Object Streaming SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB The CMS experiment at the Large Hadron Collider (LHC) at CERN, Geneva, Switzerland, is made of many detectors which in total sum up to more than 75 million channels. The detector monitoring information of all channels (temperatures, voltages, etc.), detector quality, beam conditions, and other data crucial for the reconstruction and analysis of the experiment's recorded collision events is stored in an online database. A subset of that information, the "conditions data", is copied out to another database from where it is used in the offline reconstruction and analysis processing, together with alignment data for the various detectors. Conditions data sets are accessed by a tag and an interval of validity through the offline reconstruction program CMSSW, written in C++. About 400 different types of calibration and alignment exist for the various CMS sub-detectors. With the CMS software framework moving to a multi-threaded execution model, and profiting from the experience gained during the data taking in Run-1, a major re-design of the CMS conditions software was done. During this work, a study was done to look into possible gains by using multi-threaded handling of the conditions. In this paper, we present the results of that study. C1 [Di Guida, Salvatore] Univ Studi G Marconi, Via Plinio 44, Rome, Italy. [Di Guida, Salvatore] Ist Nazl Fis Nucl, Sez Napoli, Naples, Italy. [Govi, Giacomo] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. [Di Guida, Salvatore; Ojeda, Miguel; Pfeiffer, Andreas; Sipos, Roland] CERN, CH-1211 Geneva 23, Switzerland. [Sipos, Roland] Eotvos Lorand Univ, Fac Informat, H-1117 Budapest, Hungary. RP Di Guida, S (reprint author), Univ Studi G Marconi, Via Plinio 44, Rome, Italy. EM andreas.pfeiffer@cern.ch NR 5 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 042044 DI 10.1088/1742-6596/664/4/042044 PG 6 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140601033 ER PT S AU Dodelson, S Kent, S Kowalkowski, J Paterno, M Sehrish, S AF Dodelson, Scott Kent, Steve Kowalkowski, Jim Paterno, Marc Sehrish, Saba GP IOP TI Exploring Two Approaches for an End-to-End Scientific Analysis Workflow SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB The scientific discovery process can be advanced by the integration of independently-developed programs run on disparate computing facilities into coherent workflows usable by scientists who are not experts in computing. For such advancement, we need a system which scientists can use to formulate analysis workflows, to integrate new components to these workflows, and to execute different components on resources that are best suited to run those components. In addition, we need to monitor the status of the workflow as components get scheduled and executed, and to access the intermediate and final output for visual exploration and analysis. Finally, it is important for scientists to be able to share their workflows with collaborators. We have explored two approaches for such an analysis framework for the Large Synoptic Survey Telescope (LSST) Dark Energy Science Collaboration (DESC); the first one is based on the use and extension of Galaxy, a web-based portal for biomedical research, and the second one is based on a programming language, Python. In this paper, we present a brief description of the two approaches, describe the kinds of extensions to the Galaxy system we have found necessary in order to support the wide variety of scientific analysis in the cosmology community, and discuss how similar efforts might be of benefit to the HEP community. C1 [Dodelson, Scott; Kent, Steve; Kowalkowski, Jim; Paterno, Marc; Sehrish, Saba] Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. [Dodelson, Scott] Univ Chicago, Kavli Inst Cosmol Phys, Chicago, IL 60637 USA. [Dodelson, Scott] Univ Chicago, Dept Astron & Astrophys, Chicago, IL 60637 USA. RP Dodelson, S (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM ssehrish@fnal.gov NR 4 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 062058 DI 10.1088/1742-6596/664/6/062058 PG 8 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140602048 ER PT S AU Dotti, A Elvira, VD Folger, G Genser, K Jun, SY Kowalkowski, JB Paterno, M AF Dotti, Andrea Elvira, V. Daniel Folger, Gunter Genser, Krzysztof Jun, Soon Yung Kowalkowski, James B. Paterno, Marc GP IOP TI Geant4 Computing Performance Benchmarking and Monitoring SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB Performance evaluation and analysis of large scale computing applications is essential for optimal use of resources. As detector simulation is one of the most compute intensive tasks and Geant4 is the simulation toolkit most widely used in contemporary high energy physics (HEP) experiments, it is important to monitor Geant4 through its development cycle for changes in computing performance and to identify problems and opportunities for code improvements. All Geant4 development and public releases are being profiled with a set of applications that utilize different input event samples, physics parameters, and detector configurations. Results from multiple benchmarking runs are compared to previous public and development reference releases to monitor CPU and memory usage. Observed changes are evaluated and correlated with code modifications. Besides the full summary of call stack and memory footprint, a detailed call graph analysis is available to Geant4 developers for further analysis. The set of software tools used in the performance evaluation procedure, both in sequential and multi-threaded modes, include FAST, IgProf and Open vertical bar Speedshop. The scalability of the CPU time and memory performance in multi-threaded application is evaluated by measuring event throughput and memory gain as a function of the number of threads for selected event samples. C1 [Dotti, Andrea] SLAG Natl Accelerator Lab, 2575 Sand Hill Rd, Menlo Pk, CA 94025 USA. [Elvira, V. Daniel; Genser, Krzysztof; Jun, Soon Yung; Kowalkowski, James B.; Paterno, Marc] Fermilab Natl Accelerator Lab, Batavia, IL USA. [Folger, Gunter] CERN, PH Dept, CH-1211 Geneva, Switzerland. RP Dotti, A (reprint author), SLAG Natl Accelerator Lab, 2575 Sand Hill Rd, Menlo Pk, CA 94025 USA. EM syjun@fnal.gov NR 4 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 062021 DI 10.1088/1742-6596/664/6/062021 PG 8 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140602011 ER PT S AU Dykstra, D Bockelman, B Blomer, J Herner, K Levshina, T Slyz, M AF Dykstra, D. Bockelman, B. Blomer, J. Herner, K. Levshina, T. Slyz, M. GP IOP TI Engineering the CernVM-Filesystem as a High Bandwidth Distributed Filesystem for Auxiliary Physics Data SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB A common use pattern in the computing models of particle physics experiments is running many distributed applications that read from a shared set of data files. We refer to this data is auxiliary data, to distinguish it from (a) event data from the detector (which tends to be different for every job), and (b) conditions data about the detector (which tends to be the same for each job in a batch of jobs). Relatively speaking, conditions data also tends to be relatively small per job where both event data and auxiliary data are larger per job. Unlike event data, auxiliary data comes from a limited working set of shared files. Since there is spatial locality of the auxiliary data access, the use case appears to be identical to that of the CernVM-Filesystem (CVMFS). However, we show that distributing auxiliary data through CVMFS causes the existing CVMFS infrastructure to perform poorly. We utilize a CVMFS client feature called "alien cache" to cache data on existing local high-bandwidth data servers that were engineered for storing event data. This cache is shared between the worker nodes at a site and replaces caching CVMFS files on both the worker node local disks and on the site's local squids. We have tested this alien cache with the dCache NFSv4.1 interface, Lustre, and the Hadoop Distributed File System (HDFS) FUSE interface, and measured performance. In addition, we use high-bandwidth data servers at central sites to perform the CVMFS Stratum 1 function instead of the low-bandwidth web servers deployed for the CVMFS software distribution function. We have tested this using the dCache HTTP interface. As a result, we have a design for an end-to-end high-bandwidth distributed caching read-only filesystem, using existing client software already widely deployed to grid worker nodes and existing file servers already widely installed at grid sites. Files are published in a central place and are soon available on demand throughout the grid and cached locally on the site with a convenient POSIX interface. This paper discusses the details of the architecture and reports performance measurements. C1 [Dykstra, D.; Herner, K.; Levshina, T.; Slyz, M.] Fermilab Natl Accelerator Lab, Div Comp Sci, Batavia, IL 60510 USA. [Bockelman, B.] Univ Nebraska, Lincoln, NE 68588 USA. [Blomer, J.] CERN, PH SFT Dept, Geneva, Switzerland. RP Dykstra, D (reprint author), Fermilab Natl Accelerator Lab, Div Comp Sci, Batavia, IL 60510 USA. EM dwd@fnal.gov; bbockelm@cse.unl.edu; jblomer@cern.ch; kherner@fnal.gov; tlevshin@fnal.gov; mslyz@fnal.gov NR 1 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 042012 DI 10.1088/1742-6596/664/4/042012 PG 7 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140601001 ER PT S AU Elmsheuser, J Walker, R Serfon, C Garonne, V Blunier, S Lavorini, V Nilsson, P AF Elmsheuser, J. Walker, R. Serfon, C. Garonne, V. Blunier, S. Lavorini, V. Nilsson, P. CA ATLAS Collaboration GP IOP TI New data access with HTTP/WebDAV in the ATLAS experiment SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB With the exponential growth of LHC (Large Hadron Collider) data in the years 2010-2012, distributed computing has become the established way to analyse collider data. The ATLAS experiment Grid infrastructure includes more than 130 sites worldwide, ranging from large national computing centres to smaller university clusters. So far the storage technologies and access protocols to the clusters that host this tremendous amount of data vary from site to site. HTTP/WebDAV offers the possibility to use a unified industry standard to access the storage. We present the deployment and testing of HTTP/WebDAV for local and remote data access in the ATLAS experiment for the new data management system Rucio and the PanDA workload management system. Deployment and large scale tests have been performed using the Grid testing system HammerCloud and the ROOT HTTP plugin Davix. C1 [Elmsheuser, J.; Walker, R.] Univ Munich, Marchioninistr 15, D-81377 Munich, Germany. [Serfon, C.] CERN, CH-1211 Geneva 23, Switzerland. [Garonne, V.] Univ Oslo, N-0316 Oslo, Norway. [Blunier, S.] Pontificia Univ Catolica Chile, Santiago, Chile. [Lavorini, V.] Univ Calabria, I-87030 Commenda Di Rende, Italy. [Nilsson, P.] Brookhaven Natl Lab, Upton, NY 11973 USA. RP Elmsheuser, J (reprint author), Univ Munich, Marchioninistr 15, D-81377 Munich, Germany. EM johannes.elmsheuser@physik.uni-muenchen.de NR 10 TC 0 Z9 0 U1 0 U2 2 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 042014 DI 10.1088/1742-6596/664/4/042014 PG 8 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140601003 ER PT S AU Fajardo, EM Dose, JM Holzman, B Tannenbaum, T Letts, J Tiradani, A Bockelman, B Frey, J Mason, D AF Fajardo, E. M. Dose, J. M. Holzman, B. Tannenbaum, T. Letts, J. Tiradani, A. Bockelman, B. Frey, J. Mason, D. GP IOP TI How much higher can HTCondor fly? SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB The HTCondor high throughput computing system is heavily used in the high energy physics (HEP) community as the batch system for several WorldWide LHC Computing Grid (WLCG) resources. Moreover, it is the backbone of GlideInWMS, the pilot system used by the computing organization of the Compact Muon Solenoid (CMS) experiment. To prepare for LHC Run 2, we probed the scalability limits of new versions and configurations of HTCondor with a goal of reaching 200,000 simultaneous running jobs in a single internationally distributed dynamic pool. In this paper, we first describe how we created an opportunistic distributed testbed capable of exercising runs with 200,000 simultaneous jobs without impacting production. This testbed methodology is appropriate not only for scale testing HTCondor, but potentially for many other services. In addition to the test conditions and the testbed topology, we include the suggested configuration options used to obtain the scaling results, and describe some of the changes to HTCondor inspired by our testing that enabled sustained operations at scales well beyond previous limits. C1 [Fajardo, E. M.; Dose, J. M.; Letts, J.] Univ Calif San Diego, La Jolla, CA 92093 USA. [Holzman, B.; Tiradani, A.; Mason, D.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. [Tannenbaum, T.; Frey, J.] Univ Wisconsin, Madison, WI USA. [Bockelman, B.] Univ Nebraska, Lincoln, NE USA. RP Fajardo, EM (reprint author), Univ Calif San Diego, La Jolla, CA 92093 USA. EM efajardo@physics.ucsd.edu OI Holzman, Burt/0000-0001-5235-6314 NR 15 TC 1 Z9 1 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 062014 DI 10.1088/1742-6596/664/6/062014 PG 8 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140602004 ER PT S AU Garzoglio, G Gutsche, O AF Garzoglio, G. Gutsche, O. GP IOP TI Diversity in Computing Technologies and Strategies for Dynamic Resource Allocation SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB High Energy Physics (HEP) is a very data intensive and trivially parallelizable science discipline. HEP is probing nature at increasingly finer details requiring ever increasing computational resources to process and analyze experimental data. In this paper, we discuss how HEP provisioned resources so far using Grid technologies, how HEP is starting to include new resource providers like commercial Clouds and HPC installations, and how HEP is transparently provisioning resources at these diverse providers. C1 [Garzoglio, G.; Gutsche, O.] Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. RP Garzoglio, G (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM garzogli@fnal.gov; gutsche@fnal.gov OI Gutsche, Oliver/0000-0002-8015-9622 NR 25 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 012001 DI 10.1088/1742-6596/664/1/012001 PG 14 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140600001 ER PT S AU Gerhardt, L Faham, CH Yao, Y AF Gerhardt, L. Faham, C. H. Yao, Y. GP IOP TI Accelerating Scientific Analysis with SciDB SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB SciDB is an open-source analytical database for scalable complex analytics on very large array or multi-structured data from a variety of sources, programmable from Python and R. It runs on HPC, commodity hardware grids, or in a cloud and can manage and analyze terabytes of array-structured data and do complex analytics in-database. We present an overall description of the SciDB framework and describe its implementation at NERSC at Lawrence Berkeley National Laboratory. A case study using SciDB to analyze data from the LUX dark matter detector is described and future plans for a large SciDB array at NERSC are described. C1 [Gerhardt, L.; Faham, C. H.; Yao, Y.] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, 1 Cyclotron Rd Mailstop 943R0256, Berkeley, CA 94720 USA. RP Gerhardt, L (reprint author), Univ Calif Berkeley, Lawrence Berkeley Natl Lab, 1 Cyclotron Rd Mailstop 943R0256, Berkeley, CA 94720 USA. EM lgerhardt@lbl.gov NR 3 TC 0 Z9 0 U1 1 U2 2 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 072019 DI 10.1088/1742-6596/664/7/072019 PG 7 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140602077 ER PT S AU Golosova, MV Grigorieva, MA Klimentov, AA Ryabinkin, EA Dimitrov, G Potekhin, M AF Golosova, M. V. Grigorieva, M. A. Klimentov, A. A. Ryabinkin, E. A. Dimitrov, G. Potekhin, M. GP IOP TI Studies of Big Data metadata segmentation between relational and non-relational databases SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB In recent years the concepts of Big Data became well established in IT. Systems managing large data volumes produce metadata that describe data and workflows. These metadata are used to obtain information about current system state and for statistical and trend analysis of the processes these systems drive. Over the time the amount of the stored metadata can grow dramatically. In this article we present our studies to demonstrate how metadata storage scalability and performance can be improved by using hybrid RDBMS/NoSQL architecture. C1 [Golosova, M. V.; Grigorieva, M. A.; Ryabinkin, E. A.] Natl Res Ctr Kurchatov Inst, Moscow, Russia. [Klimentov, A. A.; Potekhin, M.] Brookhaven Natl Lab, Upton, NY 11973 USA. [Dimitrov, G.] CERN, Geneva, Switzerland. RP Golosova, MV (reprint author), Natl Res Ctr Kurchatov Inst, Moscow, Russia. EM marina.golosova@cern.ch; maria.grigorieva@cern.ch NR 6 TC 1 Z9 1 U1 1 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 042023 DI 10.1088/1742-6596/664/4/042023 PG 8 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140601012 ER PT S AU Group, C Fuess, S Gutsche, O Kirby, M Kutschke, R Lyon, A Norman, A Perdue, G Sexton-Kennedy, E AF Group, Craig Fuess, S. Gutsche, O. Kirby, M. Kutschke, R. Lyon, A. Norman, A. Perdue, G. Sexton-Kennedy, E. GP IOP TI Fermilab Computing at the Intensity Frontier SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN ID FRAMEWORK AB The Intensity Frontier refers to a diverse set of particle physics experiments using high intensity beams. In this paper I will focus the discussion on the computing requirements and solutions of a set of neutrino and muon experiments in progress or planned to take place at the Fermi National Accelerator Laboratory located near Chicago, Illinois. The experiments face unique challenges, but also have overlapping computational needs. In principle, by exploiting the commonality and utilizing centralized computing tools and resources, requirements can be satisfied efficiently and scientists of individual experiments can focus more on the science and less on the development of tools and infrastructure. C1 [Group, Craig] Univ Virginia, Charlottesville, VA USA. [Fuess, S.; Gutsche, O.; Kirby, M.; Kutschke, R.; Lyon, A.; Norman, A.; Perdue, G.; Sexton-Kennedy, E.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Group, C (reprint author), Univ Virginia, Charlottesville, VA USA. EM group@virginia.edu OI Group, Robert/0000-0002-4097-5254 NR 43 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 032012 DI 10.1088/1742-6596/664/3/032012 PG 10 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140600055 ER PT S AU Habig, A Group, C Norman, A AF Habig, Alec Group, Craig Norman, A. GP IOP TI Recent Evolution of the Offline Computing Model of the NOvA Experiment SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN ID LEPTONIC DECAYS; PARAMETERS; Z0; COUPLINGS AB The NOvA experiment at Fermilab is a long-baseline neutrino experiment designed to study v(e) appearance in a v(mu) beam. Over the last few years there has been intense work to streamline the computing infrastructure in preparation for data, which started to flow in from the far detector in Fall 2013. Major accomplishments for this effort include migration to the use of off-site resources through the use of the Open Science Grid and upgrading the file-handling framework from simple disk storage to a tiered system using a comprehensive data management and delivery system to find and access files on either disk or tape storage. NOvA has already produced more than 6 5 million files and more than 1 PB of raw data and Monte Carlo simulation files which are managed under this model. The current system has demonstrated sustained rates of up to 1 TB/hour of file transfer by the data handling system. NOvA pioneered the use of new tools and this paved the way for their use by other Intensity Frontier experiments at Fermilab. Most importantly, the new framework places the experiment's infrastructure on a firm foundation, and is ready to produce the files needed for first physics. C1 [Habig, Alec] Univ Minnesota, Duluth, MN 55812 USA. [Group, Craig] Univ Virginia, Charlottesville, VA USA. [Norman, A.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Habig, A (reprint author), Univ Minnesota, Duluth, MN 55812 USA. EM ahabig@umn.edu; group@virginia.edu; anorman@fnal.gov OI Group, Robert/0000-0002-4097-5254 NR 28 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 032011 DI 10.1088/1742-6596/664/3/032011 PG 6 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140600054 ER PT S AU Hildreth, M Ivanchenko, VN Lange, DJ Kortelainen, MJ AF Hildreth, M. Ivanchenko, V. N. Lange, D. J. Kortelainen, M. J. CA CMS Collaboration GP IOP TI CMS Full Simulation for Run-2 SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB During LHC shutdown between run-1 and run-2 intensive developments were carried out to improve performance of CMS simulation. For physics improvements migration from Geant4 9.4p03 to Geant4 10.0p02 has been performed. CPU performance has been improved by introduction of the Russian roulette method inside CMS calorimeters, optimization of CMS simulation sub-libraries, and usage of statics build of the simulation executable. As a result of these efforts, CMS simulation has been speeded up by about factor two. In this work we provide description of updates for different software components of CMS simulation. Development of a multi-threaded (MT) simulation approach for CMS will be also discuss. C1 [Hildreth, M.] Univ Notre Dame, Notre Dame, IN 46556 USA. [Hildreth, M.] FNAL, Batavia, IL USA. [Ivanchenko, V. N.; Kortelainen, M. J.] CERN, CH-1211 Geneva 23, Switzerland. [Ivanchenko, V. N.] Ecoanalytica, Moscow 119899, Russia. [Ivanchenko, V. N.] Geant4 Associates Int Ltd, Batavia, IL USA. [Lange, D. J.] Lawrence Livermore Natl Lab, Livermore, CA USA. RP Ivanchenko, VN (reprint author), CERN, CH-1211 Geneva 23, Switzerland. EM Vladimir.Ivantchenko@cern.ch NR 11 TC 1 Z9 1 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 072022 DI 10.1088/1742-6596/664/7/072022 PG 8 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140602080 ER PT S AU Hollowell, C Caramarcu, C Strecker-Kellogg, W Wong, A Zaytsev, A AF Hollowell, Christopher Caramarcu, Costin Strecker-Kellogg, William Wong, Antonio Zaytsev, Alexandr GP IOP TI The Effect of NUMA Tunings on CPU Performance SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB Non-Uniform Memory Access (NUMA) is a memory architecture for symmetric multiprocessing (SMP) systems where each processor is directly connected to separate memory. Indirect access to other CPU's (remote) RAM is still possible, but such requests are slower as they must also pass through that memory's controlling CPU. In concert with a NUMA-aware operating system, the NUMA hardware architecture can help eliminate the memory performance reductions generally seen in SMP systems when multiple processors simultaneously attempt to access memory. The x86 CPU architecture has supported NUMA for a number of years. Modern operating systems such as Linux support NUMA-aware scheduling, where the OS attempts to schedule a process to the CPU directly attached to the majority of its RAM. In Linux, it is possible to further manually tune the NUMA subsystem using the numactl utility. With the release of Red Hat Enterprise Linux (RHEL) 6.3, the numad daemon became available in this distribution. This daemon monitors a system's NUMA topology and utilization, and automatically makes adjustments to optimize locality. As the number of cores in x86 servers continues to grow, efficient NUMA mappings of processes to CPUs/memory will become increasingly important. This paper gives a brief overview of NUMA, and discusses the effects of manual tunings and numad on the performance of the HEPSPECO6 benchmark, and ATLAS software. C1 [Hollowell, Christopher; Caramarcu, Costin; Strecker-Kellogg, William; Wong, Antonio; Zaytsev, Alexandr] Brookhaven Natl Lab, Upton, NY 11973 USA. RP Hollowell, C (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. EM hollowec@bnl.gov; caramarc@bnl.gov; willsk@bnl.gov; tony@bnl.gov; alezayt@bnl.gov NR 3 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 092010 DI 10.1088/1742-6596/664/9/092010 PG 7 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140603078 ER PT S AU Hufnagel, D AF Hufnagel, Dirk CA CMS Collaboration GP IOP TI The CMS TierO goes Cloud and Grid for LHC Run 2 SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB In 2015, CMS will embark on a new era of collecting LHC collisions at unprecedented rates and complexity. This will put a tremendous stress on our computing systems. Prompt Processing of the raw data by the Tier-0 infrastructure will no longer be constrained to CERN alone due to the significantly increased resource requirements. In LHC Run 2, we will need to operate it as a distributed system utilizing both the CERN Cloud-based Agile Infrastructure and a significant fraction of the CMS Tier-1 Grid resources. In another big change for LHC Run 2, we will process all data using the multi-threaded framework to deal with the increased event complexity and to ensure efficient use of the resources. This contribution will cover the evolution of the Tier-0 infrastructure and present scale testing results and experiences from the first data taking in 2015. C1 [Hufnagel, Dirk; CMS Collaboration] Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. RP Hufnagel, D (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM Dirk.Hufnagel@cern.ch NR 8 TC 0 Z9 0 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 032014 DI 10.1088/1742-6596/664/3/032014 PG 6 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140600057 ER PT S AU Hufnagel, D AF Hufnagel, Dirk CA CMS Collaboration GP IOP TI Enabling opportunistic resources for CMS Computing Operations SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB With the increased pressure on computing brought by the higher energy and luminosity from the LHC in Run 2, CMS Computing Operations expects to require the ability to utilize opportunistic resources resources not owned by, or a priori configured for CMS to meet peak demands. In addition to our dedicated resources we look to add computing resources from non CMS grids, cloud resources, and national supercomputing centers. CMS uses the HTCondor/glideinWMS job submission infrastructure for all its batch processing, so such resources will need to be transparently integrated into its glideinWMS pool. Bosco and parrot wrappers are used to enable access and bring the CMS environment into these non CMS resources. Here we describe our strategy to supplement our native capabilities with opportunistic resources and our experience so far using them. C1 [Hufnagel, Dirk; CMS Collaboration] Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. RP Hufnagel, D (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM Dirk.Hufnagel@cern.ch NR 9 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 022025 DI 10.1088/1742-6596/664/2/022025 PG 6 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140600027 ER PT S AU Illingworth, R Mengel, M Norman, A AF Illingworth, R. Mengel, M. Norman, A. GP IOP TI Re-engineering SAM or Changing the Engine in the Train While it is Running SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB In the last few years at Fermilab we re-architect-ed our SAM1[1] family of data catalog and file transfer tools including major changes while continuing to transfer over 1 Pb/month of data to multiple existing experiments and bring new experiments on board. This work was done with less than 3 FTE-years of effort, and the changes made include major ones, such as changing interprocess communication protocols, migrating database back-ends, removing and replacing major components, and supporting new file delivery methods. This paper will summarize the approaches we have used to do this, including using design patterns like the Facade, Adapter, and Command patterns, and assisting experiments one at a time with client migration. This process has allowed us to modernize our infrastructure with reasonable costs in both calendar time and developer effort, while continuing to provide the operating service to our customers with minimal interruptions. C1 [Illingworth, R.; Mengel, M.; Norman, A.] Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. RP Illingworth, R (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM anorman@fnal.gov NR 3 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 062043 DI 10.1088/1742-6596/664/6/062043 PG 7 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140602033 ER PT S AU Jayatilaka, B Leyshina, T Rynge, M Sehgal, C Slyz, M AF Jayatilaka, B. Leyshina, T. Rynge, M. Sehgal, C. Slyz, M. GP IOP TI The OSG open facility: A sharing ecosystem SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB The Open Science Grid (OSG) ties together individual experiments' computing power, connecting their resources to create a large, robust computing grid; this computing infrastructure started primarily as a collection of sites associated with large HEP experiments such as ATLAS, CDF, CMS, and D Zero. In the years since, the OSG has broadened its focus to also address the needs of other US researchers and increased delivery of Distributed High Through-put Computing (DHTC) to users from a wide variety of disciplines via the OSG Open Facility. Presently, the Open Facility delivers about 100 million computing wall hours per year to researchers who are not already associated with the owners of the computing sites; this is primarily accomplished by harvesting and organizing the temporarily unused capacity (i.e. opportunistic cycles) from the sites in the OSG. Using these methods, OSG resource providers and scientists share computing hours with researchers in many other fields to enable their science, striving to make sure that these computing power used with maximal efficiency. We believe that expanded access to DHTC is an essential tool for scientific innovation and work continues in expanding this service. C1 [Jayatilaka, B.; Leyshina, T.; Sehgal, C.] Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. [Rynge, M.; Slyz, M.] Univ So Calif, Inst Informat Sci, Marina Del Rey, CA 90292 USA. RP Jayatilaka, B (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM bcj@fnal.gov NR 6 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 032016 DI 10.1088/1742-6596/664/3/032016 PG 6 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140600059 ER PT S AU Jones, CD Contreras, L Gartung, P Hufnagel, D Sexton-Kennedy, L AF Jones, C. D. Contreras, L. Gartung, P. Hufnagel, D. Sexton-Kennedy, L. CA CMS Collaboration GP IOP TI Using the CMS Threaded Framework In A Production Environment SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB During 2014, the CMS Offline and Computing Organization completed the necessary changes to use the CMS threaded framework in the full production environment. We will briefly discuss the design of the CMS Threaded Framework, in particular how the design affects scaling performance. We will then cover the effort involved in getting both the CMSSW application software and the workflow management system ready for using multiple threads for production. Finally, we will present metrics on the performance of the application and workflow system as well as the difficulties which were uncovered. We will end with CMS' plans for using the threaded framework to do production for LHC Run 2. C1 [Jones, C. D.; Contreras, L.; Gartung, P.; Hufnagel, D.; Sexton-Kennedy, L.; CMS Collaboration] Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. RP Jones, CD (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM cdj@fnal.gov NR 2 TC 1 Z9 1 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 072026 DI 10.1088/1742-6596/664/7/072026 PG 7 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140602084 ER PT S AU Karavakis, E Barreiro, F Campana, S De, K Di Girolamo, A Litmaath, M Maeno, T Medrano, R Nilsson, P Wenaus, T AF Karavakis, E. Barreiro, F. Campana, S. De, K. Di Girolamo, A. Litmaath, M. Maeno, T. Medrano, R. Nilsson, P. Wenaus, T. CA ATLAS Collaboration GP IOP TI gLExec Integration with the ATLAS PanDA Workload Management System SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB ATLAS user jobs are executed on Worker Nodes (WNs) by pilots sent to sites by pilot factories. This paradigm serves to allow a high job reliability and although it has clear advantages, such as making the working environment homogeneous, the approach presents security and traceability challenges. To address these challenges, gLExec can be used to let the payloads for each user be executed under a different UNIX user id that uniquely identifies the ATLAS user. This paper describes the recent improvements and evolution of the security model within the ATLAS PanDA system, including improvements in the PanDA pilot, in the PanDA server and their integration with MyProxy, a credential caching system that entitles a person or a service to act in the name of the issuer of the credential. Finally, it presents results from ATLAS user jobs running with gLExec and describes the deployment campaign within ATLAS. C1 [Karavakis, E.; Campana, S.; Di Girolamo, A.; Litmaath, M.; Medrano, R.] CERN, European Org Nucl Res, CH-1211 Geneva 23, Switzerland. [Barreiro, F.; De, K.] Univ Texas Arlington, Arlington, TX USA. [Maeno, T.; Nilsson, P.; Wenaus, T.] Brookhaven Natl Lab, Upton, NY 11973 USA. RP Karavakis, E (reprint author), CERN, European Org Nucl Res, CH-1211 Geneva 23, Switzerland. EM Edward.Karavakis@cern.ch NR 18 TC 0 Z9 0 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 062022 DI 10.1088/1742-6596/664/6/062022 PG 7 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140602012 ER PT S AU Kutschke, RK AF Kutschke, Robert K. GP IOP TI Breaking the Silos: The art Documentation Suite SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB The art event-processing framework is used by almost all new experiments at Fermilab, and by several outside of Fermilab. All use art as an external product in the same sense that the compiler, ROOT, Geant4, CLHEP and boost are external products. The art team has embarked on a campaign to document art and develop training materials for new users. Many new users of art have little or no knowledge of C++, software engineering, build systems or the many external packages used by art or their experiments, such as ROOT, CLHEP, HEPPDT, and boost. To effectively teach art requires that the training materials include appropriate introductions to these topics as they are encountered. Experience has shown that simply referring readers to the existing native documentation does not work; too often a simple idea that they need to understand is described in a context that presumes prerequisites that are unimportant for a beginning user of art. There is the additional complication that the training materials must be presented in a way that does not presume knowledge of any of the experiments using art. Finally, new users of art arrive at random times throughout the year and the training materials must allow them to start to learn art at any time. This presentation will explain the strategies adopted by the art team to develop a documentation suite that complies with these boundary conditions. It will also show the present status of the documentation suite, including feedback the art team has received from pilot users. C1 [Kutschke, Robert K.] Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60542 USA. RP Kutschke, RK (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60542 USA. EM kutschke@fnal.gov NR 0 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 072030 DI 10.1088/1742-6596/664/7/072030 PG 8 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140602088 ER PT S AU Lavrijsen, W AF Lavrijsen, W. GP IOP TI Python in the Cling World SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB The language improvements in C++11/14 greatly reduce the amount of boilerplate code required and allow resource ownership to be clarified in interfaces. On top, the Cling C++ interpreter brings a truly interactive experience and real dynamic behavior to the language. Taken together, these developments bring C++ much closer to Python in ability, allowing the combination of PyROOT/cppyy and Cling to integrate the two languages on a new level. This paper describes the current state of the art, including cross-language callbacks, automatic template instantiations, and the ability to use Python from Cling. C1 [Lavrijsen, W.] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. RP Lavrijsen, W (reprint author), Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. EM WLavrijsen@lbl.gov NR 0 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 062029 DI 10.1088/1742-6596/664/6/062029 PG 5 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140602019 ER PT S AU Maier, T Benjamin, D Bhimji, W Elmsheuser, J Van Gemmeren, P Malon, D Krumnack, N AF Maier, T. Benjamin, D. Bhimji, W. Elmsheuser, J. Van Gemmeren, P. Malon, D. Krumnack, N. CA ATLAS Collaboration GP IOP TI ATLAS I/O performance optimization in as-deployed environments SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB This paper provides an overview of an integrated program of work underway within the ATLAS experiment to optimise I/O performance for large-scale physics data analysis in a range of deployment environments. It proceeds to examine in greater detail one component of that work, the tuning of job-level I/O parameters in response to changes to the ATLAS event data model, and considers the implications of such tuning for a number of measures of I/O performance. C1 [Maier, T.; Elmsheuser, J.] Univ Munich, Marchioninistr 15, D-81377 Munich, Germany. [Benjamin, D.] Duke Univ, Durham, NC 27706 USA. [Bhimji, W.] Univ Edinburgh, Edinburgh EH8 9YL, Midlothian, Scotland. [Van Gemmeren, P.; Malon, D.] Argonne Natl Lab, Argonne, IL 60439 USA. [Krumnack, N.] Iowa State Univ, Ames, IA USA. RP Maier, T (reprint author), Univ Munich, Marchioninistr 15, D-81377 Munich, Germany. EM thomas.maier@physik.uni-muenchen.de NR 10 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 042033 DI 10.1088/1742-6596/664/4/042033 PG 8 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140601022 ER PT S AU Millar, AP Fuhrmann, P Mkrtchyan, T Behrmann, G Bernardt, C Buchholz, Q Guelzow, V Litvintsev, D Schwank, K Rossi, A van der Reest, P AF Millar, A. P. Fuhrmann, P. Mkrtchyan, T. Behrmann, G. Bernardt, C. Buchholz, Q. Guelzow, V. Litvintsev, D. Schwank, K. Rossi, A. van der Reest, P. GP IOP TI dCache, Sync-and-Share for Big Data SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB The availability of cheap, easy-to-use sync-and-share cloud services has split the scientific storage world into the traditional big data management systems and the very attractive sync-and-share services. With the former, the location of data is well understood while the latter is mostly operated in the Cloud, resulting in a rather complex legal situation. Beside legal issues, those two worlds have little overlap in user authentication and access protocols. While traditional storage technologies, popular in HEP, are based on X.509, cloud services and sync-and-share software technologies are generally based on username/password authentication or mechanisms like SAML or Open ID Connect. Similarly, data access models offered by both are somewhat different, with sync-and-share services often using proprietary protocols. As both approaches are very attractive, dCache.org developed a hybrid system, providing the best of both worlds. To avoid reinventing the wheel, dCache.org decided to embed another Open Source project: OwnCloud. This offers the required modern access capabilities but does not support the managed data functionality needed for large capacity data storage. With this hybrid system, scientists can share files and synchronize their data with laptops or mobile devices as easy as with any other cloud storage service. On top of this, the same data can be accessed via established mechanisms, like GridFTP to serve the Globus Transfer Service or the WLCG FTS3 tool, or the data can be made available to worker nodes or HPC applications via a mounted filesystem. As dCache provides a flexible authentication module, the same user can access its storage via different authentication mechanisms; e.g., X.509 and SAML. Additionally, users can specify the desired quality of service or trigger media transitions as necessary, thus tuning data access latency to the planned access profile. Such features are a natural consequence of using dCache. We will describe the design of the hybrid dCache/OwnCloud system, report on several months of operations experience running it at DESY, and elucidate the future road-map. C1 [Millar, A. P.; Fuhrmann, P.; Mkrtchyan, T.; Bernardt, C.; Buchholz, Q.; Guelzow, V.; Schwank, K.; van der Reest, P.] DESY, IT Dept, Notkestr 85, Hamburg, Germany. [Behrmann, G.] Gerd Behrmann, Copenhagen, Denmark. [Litvintsev, D.; Rossi, A.] Fermilab Natl Accelerator Lab, Batavia, IL USA. RP Millar, AP (reprint author), DESY, IT Dept, Notkestr 85, Hamburg, Germany. EM paul.millar@desy.de NR 2 TC 0 Z9 0 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 042038 DI 10.1088/1742-6596/664/4/042038 PG 5 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140601027 ER PT S AU Millar, AP Behrmann, G Bernardt, C Fuhrmann, P Hardt, M Hayrapetyan, A Litvintsev, D Mkrtchyan, T Rossi, A Schwank, K AF Millar, A. P. Behrmann, G. Bernardt, C. Fuhrmann, P. Hardt, M. Hayrapetyan, A. Litvintsev, D. Mkrtchyan, T. Rossi, A. Schwank, K. GP IOP TI Unlocking data: federated identity with LSDMA and dCache SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB X.509, the dominant identity system from grid computing, has proved unpopular for many user communities. More popular alternatives generally assume the user is interacting via their web-browser. Such alternatives allow a user to authenticate with many services with the same credentials (user-name and password). They also allow users from different organisations form collaborations quickly and simply. Scientists generally require that their custom analysis software has direct access to the data. Such direct access is not currently supported by alternatives to X.509, as they require the use of a web-browser. Various approaches to solve this issue are being investigated as part of the Large Scale Data Management and Analysis (LSDMA) project, a German funded national R&D project. These involve dynamic credential translation (creating an X.509 credential) to allow backwards compatibility in addition to direct SAML- and OpenID Connect-based authentication. We present a summary of the current state of art and the current status of the federated identity work funded by the LSDMA project along with the future road map. C1 [Millar, A. P.; Bernardt, C.; Fuhrmann, P.; Mkrtchyan, T.; Schwank, K.] DESY, IT Dept, Notkestr 85, Hamburg, Germany. [Behrmann, G.] Gerd Behrmann, Copenhagen, Denmark. [Hardt, M.; Hayrapetyan, A.] Steinbuch Ctr Comp, Karlsruhe, Germany. [Litvintsev, D.; Rossi, A.] Fermilab Natl Accelerator Lab, Batavia, IL USA. RP Millar, AP (reprint author), DESY, IT Dept, Notkestr 85, Hamburg, Germany. EM paul.millar@desy.de NR 3 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 042037 DI 10.1088/1742-6596/664/4/042037 PG 4 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140601026 ER PT S AU Mina, R Frank, MJ Fries, E Group, RC Norman, A Oksuzian, I AF Mina, R. Frank, M. J. Fries, E. Group, R. C. Norman, A. Oksuzian, I. GP IOP TI Implementation of an upward-going muon trigger for indirect dark matter searches at the NOvA far detector SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB The NOvA collaboration has constructed a 14,000 ton, fine-grained, low-Z, total absorption tracking calorimeter at an off-axis angle to an upgraded NuMI neutrino beam. This detector, with its excellent granularity and energy resolution and relatively low-energy neutrino thresholds, was designed to observe electron neutrino appearance in a muon neutrino beam, but it also has unique capabilities suitable for more exotic efforts. In fact, if an efficient upward going muon trigger with sufficient cosmic ray background rejection can be demonstrated, NOvA will be capable of a competitive indirect dark matter search for low-mass WIMPs. The cosmic ray muon rate at the NOvA far detector is about 100 kHz and provides the primary challenge for triggering and optimizing such a search analysis. The status of the NOvA upward-going muon trigger is presented. C1 [Mina, R.; Frank, M. J.; Fries, E.; Group, R. C.; Oksuzian, I.] Univ Virginia, Charlottesville, VA USA. [Group, R. C.; Norman, A.] Fermilab Natl Accelerator Lab, Batavia, IL USA. RP Mina, R (reprint author), Univ Virginia, Charlottesville, VA USA. EM ram2aq@virginia.edu NR 9 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 082034 DI 10.1088/1742-6596/664/8/082034 PG 7 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140603046 ER PT S AU Miyake, H Grzymkowski, R Ludacka, R Schram, M AF Miyake, Hideki Grzymkowski, Rafal Ludacka, Radek Schram, Malachi CA Belle II Comp Grp GP IOP TI Belle II production system SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB The Belle II experiment will record a similar quantity of data to LHC experiments and will acquire it at similar rates. This requires considerable computing, storage and network resources to handle not only data created by the experiment but also considerable amounts of simulated data. Consequently Belle II employs a distributed computing system to provide the resources coordinated by the the DIRAC interware. DIRAC is a general software framework that provides a unified interface among heterogeneous computing resources. In addition to the well proven DIRAC software stack, Belle II is developing its own extension called Be11eDIRAC. Be11eDIRAC provides a transparent user experience for the Belle II analysis framework (basf2) on various environments and gives access to file information managed by LFC and AMGA metadata catalog. By unifying DIRAC and Be11eDIRAC functionalities, Belle II plans to operate an automated mass data processing framework named a "production system". The Belle II production system enables large-scale raw data transfer from experimental site to raw data centers, followed by massive data processing, and smart data delivery to each remote site. The production system is also utilized for simulated data production and data analysis. Although development of the production system is still on-going, recently Belle II has prepared prototype version and evaluated it with a large scale simulated data production. In this presentation we will report the evaluation of the prototype system and future development plans. C1 [Miyake, Hideki] High Energy Accelerator Res Org KEK, Tokyo, Japan. [Grzymkowski, Rafal] Inst Nucl Phys, Krakow, Poland. [Ludacka, Radek] Charles Univ Prague, Prague, Czech Republic. [Schram, Malachi] Pacific NW Natl Lab, Richland, WA 99352 USA. RP Miyake, H (reprint author), High Energy Accelerator Res Org KEK, Tokyo, Japan. EM hideki.miyake@kek.jp NR 5 TC 0 Z9 0 U1 1 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 052028 DI 10.1088/1742-6596/664/5/052028 PG 6 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140601075 ER PT S AU Yzquierdo, APC Hernandez, JM Khan, FA Letts, J Majewski, K Rodrigues, AM McCrea, A Vaandering, E AF Perez-Calero Yzquierdo, A. Hernandez, J. M. Khan, F. A. Letts, J. Majewski, K. Rodrigues, A. M. McCrea, A. Vaandering, E. CA CMS Collaboration GP IOP TI Evolution of CMS workload management towards multicore job support SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB The successful exploitation of multicore processor architectures is a key element of the LHC distributed computing system in the coming era of the LHC Run 2. High-pileup complex-collision events represent a challenge for the traditional sequential programming in terms of memory and processing time budget. The CMS data production and processing framework is introducing the parallel execution of the reconstruction and simulation algorithms to overcome these limitations. CMS plans to execute multicore jobs while still supporting single core processing for other tasks difficult to parallelize, such as user analysis. The CMS strategy for job management thus aims at integrating single and multicore job scheduling across the Grid. This is accomplished by employing multicore pilots with internal dynamic partitioning of the allocated resources, capable of running payloads of various core counts simultaneously. An extensive test programme has been conducted to enable multicore scheduling with the various local batch systems available at CMS sites, with the focus on the Tier-0 and Tier-ls, responsible during 2015 of the prompt data reconstruction. Scale tests have been run to analyse the performance of this scheduling strategy and ensure an efficient use of the distributed resources. This paper presents the evolution of the CMS job management and resource provisioning systems in order to support this hybrid scheduling model, as well as its deployment and performance tests, which will enable CMS to transition to a multicore production model for the second LHC run. C1 [Perez-Calero Yzquierdo, A.] Univ Autonoma Barcelona, PIC, Bellaterra, Barcelona, Spain. [Perez-Calero Yzquierdo, A.; Hernandez, J. M.] CIEMAT, E-28040 Madrid, Spain. [Khan, F. A.] Quaid I Azam Univ, Natl Ctr Phys, Lahore, Pakistan. [Letts, J.; McCrea, A.] Univ Calif San Diego, La Jolla, CA 92093 USA. [Majewski, K.; Rodrigues, A. M.; Vaandering, E.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Yzquierdo, APC (reprint author), Univ Autonoma Barcelona, PIC, Bellaterra, Barcelona, Spain. EM aperez@pic.es NR 4 TC 0 Z9 0 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 062046 DI 10.1088/1742-6596/664/6/062046 PG 8 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140602036 ER PT S AU Poat, MD Lauret, J Betts, W AF Poat, M. D. Lauret, J. Betts, W. GP IOP TI Configuration Management and Infrastructure Monitoring Using CFEngine and Icinga for Real-time Heterogeneous Data Taking Environment SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB The STAR online computing environment is an intensive ever-growing system used for real-time data collection and analysis. Composed of heterogeneous and sometimes groups of custom-tuned machines, the computing infrastructure was previously managed by manual configurations and inconsistently monitored by a combination of tools. This situation led to configuration inconsistency and an overload of repetitive tasks along with lackluster communication between personnel and machines. Globally securing this heterogeneous cyber-infrastructure was tedious at best and an agile, policy-driven system ensuring consistency, was pursued. Three configuration management tools, Chef, Puppet, and CFEngine have been compared in reliability, versatility and performance along with a comparison of infrastructure monitoring tools Nagios and Icinga. STAR has selected the CFEngine configuration management tool and the Icinga infrastructure monitoring system leading to a versatile and sustainable solution. By leveraging these two tools STAR can now swiftly upgrade and modify the environment to its needs with ease as well as promptly react to cyber-security requests. By creating a sustainable long term monitoring solution, the detection of failures was reduced from days to minutes, allowing rapid actions before the issues become dire problems, potentially causing loss of precious experimental data or uptime. C1 [Poat, M. D.; Lauret, J.; Betts, W.] Brookhaven Natl Lab, POB 5000, Upton, NY 11973 USA. RP Poat, MD (reprint author), Brookhaven Natl Lab, POB 5000, Upton, NY 11973 USA. EM mpoat@bnl.gov NR 3 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 052020 DI 10.1088/1742-6596/664/5/052020 PG 6 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140601067 ER PT S AU Poat, MD Lauret, J Betts, W AF Poat, M. D. Lauret, J. Betts, W. GP IOP TI POSIX and Object Distributed Storage Systems Performance Comparison Studies With Real-Life Scenarios in an Experimental Data Taking Context Leveraging OpenStack Swift & Ceph SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB The STAR online computing infrastructure has become an intensivedynamic system used for first-hand data collection and analysis resulting in a dense collection of data output. As we have transitioned to our current state, inefficient, limited storage systems have become an impediment to fast feedback to online shift crews. Motivation for a centrally accessible, scalable and redundant distributed storage system had become a necessity in this environment. OpenStack Swift Object Storage and Ceph Object Storage are two eye-opening technologies as community use and development have led to success elsewhere. In this contribution, OpenStack Swift and Ceph have been put to the test with single and parallel I/O tests, emulating real world scenarios for data processing and workflows. The Ceph file system storage, offering a POSIX compliant file system mounted similarly to an NIPS share was of particular interest as it aligned with our requirements and was retained as our solution. I/O performance tests were run against the Ceph POSIX file system and have presented surprising results indicating true potential for fast I/O and reliability. STAR's online compute farm historical use has been for job submission and first hand data analysis. The goal of reusing the online compute farm to maintain a storage cluster and job submission will be an efficient use of the current infrastructure. C1 [Poat, M. D.; Lauret, J.; Betts, W.] Brookhaven Natl Lab, POB 5000, Upton, NY 11973 USA. RP Poat, MD (reprint author), Brookhaven Natl Lab, POB 5000, Upton, NY 11973 USA. EM mpoat@bnl.gov NR 2 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 042031 DI 10.1088/1742-6596/664/4/042031 PG 9 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140601020 ER PT S AU Ratnikova, N Karavakis, E Lammel, S Wildish, T AF Ratnikova, N. Karavakis, E. Lammel, S. Wildish, T. GP IOP TI Comprehensive Monitoring for Heterogeneous Geographically Distributed Storage SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB Storage capacity at CMS Tier-1 and Tier-2 sites reached over 100 Petabytes in 2014, and will be substantially increased during Run 2 data taking. The allocation of storage for the individual users analysis data, which is not accounted as a centrally managed storage space, will be increased to up to 40%. For comprehensive tracking and monitoring of the storage utilization across all participating sites, CMS developed a space monitoring system, which provides a central view of the geographically dispersed heterogeneous storage systems. The first prototype was deployed at pilot sites in summer 2014, and has been substantially reworked since then. In this paper we discuss the functionality and our experience of system deployment and operation on the full CMS scale. C1 [Ratnikova, N.; Lammel, S.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. [Karavakis, E.] CERN, CH-1211 Geneva 23, Switzerland. [Wildish, T.] Princeton Univ, Princeton, NJ 08544 USA. RP Ratnikova, N (reprint author), Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. EM natalia.ratnikova@cern.ch; tony.wildish@cern.ch NR 11 TC 0 Z9 0 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 042055 DI 10.1088/1742-6596/664/4/042055 PG 6 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140601044 ER PT S AU Riahi, H Wildish, T Ciangottini, D Hernandez, JM Andreeva, J Balcas, J Karavakis, E Mascheroni, M Tanasijczuk, AJ Vaandering, EW AF Riahi, H. Wildish, T. Ciangottini, D. Hernandez, J. M. Andreeva, J. Balcas, J. Karavakis, E. Mascheroni, M. Tanasijczuk, A. J. Vaandering, E. W. CA CMS Collaboration GP IOP TI AsyncStageOut: Distributed user data management for CMS Analysis SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB AsyncStageOut (ASO) is a new component of the distributed data analysis system of CMS, CRAB, designed for managing users' data. It addresses a major weakness of the previous model, namely that mass storage of output data was part of the job execution resulting in inefficient use of job slots and an unacceptable failure rate at the end of the jobs. ASO foresees the management of up to 400k files per day of various sizes, spread worldwide across more than 60 sites. It must handle up to 1000 individual users per month, and work with minimal delay. This creates challenging requirements for system scalability, performance and monitoring. ASO uses FTS to schedule and execute the transfers between the storage elements of the source and destination sites. It has evolved from a limited prototype to a highly adaptable service, which manages and monitors the user file placement and bookkeeping. To ensure system scalability and data monitoring, it employs new technologies such as a NoSQL database and re-uses existing components of PhEDEx and the FTS Dashboard. We present the asynchronous stage-out strategy and the architecture of the solution we implemented to deal with those issues and challenges. The deployment model for the high availability and scalability of the service is discussed. The performance of the system during the commissioning and the first phase of production are also shown, along with results from simulations designed to explore the limits of scalability. C1 [Riahi, H.; Andreeva, J.; Karavakis, E.] European Org Nucl Res, IT Dept, CH-1211 Geneva 23, Switzerland. [Wildish, T.] Princeton Univ, Princeton, NJ 08544 USA. [Ciangottini, D.] Univ Perugia, I-06123 Perugia, Italy. [Ciangottini, D.] INFN Perugia, I-06123 Perugia, Italy. [Hernandez, J. M.] CIEMAT, Madrid 28040, Spain. [Balcas, J.] Vilnius Univ, DiSCC, LT-01513 Vilnius, Lithuania. [Mascheroni, M.] INFN Milano Bicocca, I-20126 Milan, Italy. [Tanasijczuk, A. J.] Univ Calif San Diego, La Jolla, CA 92093 USA. [Vaandering, E. W.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Riahi, H (reprint author), European Org Nucl Res, IT Dept, CH-1211 Geneva 23, Switzerland. EM Hassen.Riahi@cern.ch; Tony.Wildish@cern.ch; Diego.Ciangottini@pg.infn.it NR 7 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 062052 DI 10.1088/1742-6596/664/6/062052 PG 9 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140602042 ER PT S AU Riahi, H Salichos, M Keeble, O Andreeva, J Ayllon, AA Di Girolamo, A Magini, N Roiser, S Simon, MK AF Riahi, H. Salichos, M. Keeble, O. Andreeva, J. Ayllon, A. A. Di Girolamo, A. Magini, N. Roiser, S. Simon, M. K. GP IOP TI FTS3: Quantitative Monitoring SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB The overall success of LHC data processing depends heavily on stable, reliable and fast data distribution. The Worldwide LHC Computing Grid (WLCG) relies on the File Transfer Service (FTS) as the data movement middleware for moving sets of files from one site to another. This paper describes the components of FTS3 monitoring infrastructure and how they are built to satisfy the common and particular requirements of the LHC experiments. We show how the system provides a complete and detailed cross -virtual organization (VO) picture of transfers for sites, operators and VOs. This information has proven critical due to the shared nature of the infrastructure, allowing a complete view of all transfers on shared network links between various workflows and VOs using the same FTS transfer manager. We also report on the performance of the FTS service itself, using data generated by the aforementioned monitoring infrastructure both during the commissioning and the first phase of production. We also explain how this monitoring information and network metrics produced can be used both as a starting point for troubleshooting data transfer issues, but also as a mechanism to collect information such as transfer efficiency between sites, achieved throughput and its evolution over time, most common errors, etc, and take decision upon them to further optimize transfer workflows. The service setup is subject to sites policies to control the network resource usage, as well as all the VOs making use of the Grid resources at the site to satisfy their requirements. FTS3 is the new version of FTS and has been deployed in production in August 2014. C1 [Riahi, H.; Salichos, M.; Keeble, O.; Andreeva, J.; Ayllon, A. A.; Di Girolamo, A.; Roiser, S.; Simon, M. K.] European Org Nucl Res, IT Dept, CH-1211 Geneva 23, Switzerland. [Magini, N.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Riahi, H (reprint author), European Org Nucl Res, IT Dept, CH-1211 Geneva 23, Switzerland. EM Hassen.Riahi@cern.ch; Michail.Salichos@cern.ch; Oliver.Keeble@cern.ch; Julia.Andreeva@cern.ch; alejandro.alvarez.ayllon@cern.ch; Alessandro.Di.Girolamo@cern.ch; Nicolo.Magini@cern.ch; Stefan.Roiser@cern.ch; Michal.Simon@cern.ch NR 9 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 062051 DI 10.1088/1742-6596/664/6/062051 PG 9 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140602041 ER PT S AU Seuster, R Elsing, M Stewart, GA Tsulaia, V AF Seuster, R. Elsing, M. Stewart, G. A. Tsulaia, V. CA ATLAS Collaboration GP IOP TI Status and Future Evolution of the ATLAS Offline Software SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB These proceedings give a summary of the many software upgrade projects undertaken to prepare ATLAS for the challenges of Run-2 of the LHC. Those projects include a significant reduction of the CPU time required for reconstruction of real data with high average pile-up event rates compared to 2012. This is required to meet the challenges of the expected increase in pileup and the higher data taking rate of up to 1 kHz. By far the most ambitious project is the implementation of a completely new analysis model, based on a new ROOT readable reconstruction format, xAOD. The new model also includes a reduction framework based on a train model to centrally produce skimmed data samples and an analysis framework. These proceedings close with a brief overview of future software projects and plans that will lead up to the coming Long Shutdown 2 as the next major ATLAS software upgrade phase. C1 [Seuster, R.] TRIUMF, 4004 Wesbrook Mall, Vancouver, BC V6T 2A3, Canada. [Elsing, M.] CERN, CH-1211 Geneva 23, Switzerland. [Stewart, G. A.] Univ Glasgow, Sch Phys & Astron, Glasgow G12 8QQ, Lanark, Scotland. [Tsulaia, V.] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. RP Seuster, R (reprint author), TRIUMF, 4004 Wesbrook Mall, Vancouver, BC V6T 2A3, Canada. EM Rolf.Seuster@cern.ch NR 11 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 072044 DI 10.1088/1742-6596/664/7/072044 PG 8 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140603003 ER PT S AU Sexton-Kennedy, E AF Sexton-Kennedy, E. GP IOP TI A Review of Event Processing Frameworks used in HEP SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB Today there are many different experimental event processing frameworks in use by running or about to be running experiments. This talk will discuss the different components of these frameworks. In the past there have been attempts at shared framework projects for example the collaborations on the BaBar framework (between BaBar, CDF, and CLEO), on the Gaudi framework (between LHCb and ATLAS), on AliROOT/FairROOT (between Alice and GSI/Fair), and in some ways on art (Fermilab based experiments) and CMS' framework. However, for reasons that will be discussed, these collaborations did not result in common frameworks shared among the intended experiments. Though importantly, two of the resulting projects have succeeded in providing frameworks that are shared among many customer experiments: Fermilab's art framework and GSI/Fair's FairROOT. Interestingly, several projects are considering remerging their frameworks after many years apart. I'll report on an investigation and analysis of these realities. With the advent of the need for multi-threaded frameworks and the scarce available manpower, it is important to collaborate in the future; however it is also important to understand why previous attempts at multi-experiment frameworks either worked or didn't work. C1 [Sexton-Kennedy, E.] Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. RP Sexton-Kennedy, E (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM sexton@fnal.gov NR 4 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 032026 DI 10.1088/1742-6596/664/3/032026 PG 4 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140600069 ER PT S AU Shannigrahi, S Papadopoulos, C Yeh, E Newman, H Barczyk, AJ Liu, R Sim, A Mughal, A Monga, I Vlimant, JR Wu, J AF Shannigrahi, Susmit Papadopoulos, Christos Yeh, Edmund Newman, Harvey Barczyk, Artur Jerzy Liu, Ran Sim, Alex Mughal, Azher Monga, Inder Vlimant, Jean-Roch Wu, John GP IOP TI Named Data Networking in Climate Research and HEP Applications SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB The Computing Models of the LHC experiments continue to evolve from the simple hierarchical MONARC[2] model towards more agile models where data is exchanged among many Tier2 and Tier3 sites, relying on both large scale file transfers with strategic data placement, and an increased use of remote access to object collections with caching through CMS's AAA, ATLAS' FAX and ALICE's AliEn projects, for example. The challenges presented by expanding needs for CPU, storage and network capacity as well as rapid handling of large datasets of file and object collections have pointed the way towards future more agile pervasive models that make best use of highly distributed heterogeneous resources. In this paper, we explore the use of Named Data Networking (NDN), a new Internet architecture focusing on content rather than the location of the data collections. As NDN has shown considerable promise in another data intensive field, Climate Science, we discuss the similarities and differences between the Climate and HEP use cases, along with specific issues HEP faces and will face during LHC Run2 and beyond, which NDN could address. C1 [Shannigrahi, Susmit; Papadopoulos, Christos] Colorado State Univ, Ft Collins, CO 80521 USA. [Newman, Harvey; Mughal, Azher; Vlimant, Jean-Roch] CALTECH, Pasadena, CA 91125 USA. [Sim, Alex; Wu, John] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. [Monga, Inder] ESNet, Berkeley, CA 94720 USA. [Yeh, Edmund] Northeastern Univ, Boston, MA 02115 USA. [Barczyk, Artur Jerzy; Liu, Ran] CALTECH, Pasadena, CA 91125 USA. [Barczyk, Artur Jerzy; Liu, Ran] Cisco Syst Inc, Pasadena, CA 91125 USA. RP Shannigrahi, S (reprint author), Colorado State Univ, Ft Collins, CO 80521 USA. EM susmit@cs.colostate.edu; christos@cs.colostate.edu; eyeh@ece.neu.edu; newman@hep.caltech.edu; Artur.Barczyk@cern.ch; asim@lbl.gov; azher@hep.caltech.edu; imonga@es.net; vlimant@cern.ch; kwu@lbl.gov NR 5 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 052033 DI 10.1088/1742-6596/664/5/052033 PG 8 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140601080 ER PT S AU Smith, JA Richman, G DeStefano, J Pryor, J Rao, T Strecker-Kellogg, W Wong, T AF Smith, Jason A. Richman, Gabriel DeStefano, John Pryor, James Rao, Tejas Strecker-Kellogg, William Wong, Tony GP IOP TI The Careful Puppet Master: Reducing risk and fortifying acceptance testing with Jenkins CI SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB Centralized configuration management, including the use of automation tools such as Puppet, can greatly increase provisioning speed and efficiency when configuring new systems or making changes to existing systems, reduce duplication of work, and improve automated processes. However, centralized management also brings with it a level of inherent risk: a single change in just one file can quickly be pushed out to thousands of computers and, if that change is not properly and thoroughly tested and contains an error, could result in catastrophic damage to many services, potentially bringing an entire computer facility offline. Change management procedures can-and should-be formalized in order to prevent such accidents. However, like the configuration management process itself, if such procedures are not automated, they can be difficult to enforce strictly. Therefore, to reduce the risk of merging potentially harmful changes into our production Puppet environment, we have created an automated testing system, which includes the Jenkins CI tool, to manage our Puppet testing process. This system includes the proposed changes and runs Puppet on a pool of dozens of RedHat Enterprise Virtualization (RHEV) virtual machines (VMs) that replicate most of our important production services for the purpose of testing. This paper describes our automated test system and how it hooks into our production approval process for automatic acceptance testing. All pending changes that have been pushed to production must pass this validation process before they can be approved and merged into production. C1 [Smith, Jason A.; Richman, Gabriel; DeStefano, John; Pryor, James; Rao, Tejas; Strecker-Kellogg, William; Wong, Tony] Brookhaven Natl Lab, POB 5000, Upton, NY 11973 USA. RP Smith, JA (reprint author), Brookhaven Natl Lab, POB 5000, Upton, NY 11973 USA. EM smithj4@bnl.gov; grichman@oberlin.edu; jd@bnl.gov; pryja02@gmail.com; raot@bnl.gov; willsk@bnl.gov; tony@bnl.gov NR 2 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 062059 DI 10.1088/1742-6596/664/6/062059 PG 8 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140602049 ER PT S AU Taylor, RP Berghaus, F Brasolin, F Cordeiro, CJD Desmarais, R Field, L Gable, I Giordano, D Di Girolamo, A Hover, J LeBlanc, M Love, P Paterson, M Sobie, R Zaytsev, A AF Taylor, Ryan P. Berghaus, Frank Brasolin, Franco Cordeiro, Cristovao Jose Domingues Desmarais, Ron Field, Laurence Gable, Ian Giordano, Domenico Di Girolamo, Alessandro Hover, John LeBlanc, Matthew Love, Peter Paterson, Michael Sobie, Randall Zaytsev, Alexandr CA ATLAS Collaboration GP IOP TI The Evolution of Cloud Computing in ATLAS SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB The ATLAS experiment at the LHC has successfully incorporated cloud computing technology and cloud resources into its primarily grid-based model of distributed computing. Cloud R&D activities continue to mature and transition into stable production systems, while ongoing evolutionary changes are still needed to adapt and refine the approaches used, in response to changes in prevailing cloud technology. In addition, completely new developments are needed to handle emerging requirements. This paper describes the overall evolution of cloud computing in ATLAS. The current status of the virtual machine (VM) management systems used for harnessing Infrastructure as a Service resources are discussed. Monitoring and accounting systems tailored for clouds are needed to complete the integration of cloud resources within ATLAS' distributed computing framework. We are developing and deploying new solutions to address the challenge of operation in a geographically distributed multi-cloud scenario, including a system for managing VM images across multiple clouds, a system for dynamic location-based discovery of caching proxy servers, and the usage of a data federation to unify the worldwide grid of storage elements into a single namespace and access point. The usage of the experiment's high level trigger farm for Monte Carlo production, in a specialized cloud environment, is presented. Finally, we evaluate and compare the performance of commercial clouds using several benchmarks. C1 [Taylor, Ryan P.; Berghaus, Frank; Desmarais, Ron; Gable, Ian; LeBlanc, Matthew; Paterson, Michael; Sobie, Randall] Univ Victoria, Victoria, BC, Canada. [Brasolin, Franco] Ist Nazl Fis Nucl, I-40126 Bologna, Italy. [Cordeiro, Cristovao Jose Domingues; Field, Laurence; Giordano, Domenico; Di Girolamo, Alessandro] CERN, Geneva, Switzerland. [Hover, John] Brookhaven Natl Lab, Upton, NY 11973 USA. [Love, Peter] Univ Lancaster, Lancaster, England. RP Taylor, RP (reprint author), Univ Victoria, Victoria, BC, Canada. OI Berghaus, Frank/0000-0003-1887-3910 NR 21 TC 1 Z9 1 U1 1 U2 4 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 022038 DI 10.1088/1742-6596/664/2/022038 PG 8 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140600040 ER PT S AU Timm, S Garzoglio, G Mhashilkar, P Boyd, J Bernabeu, G Sharma, N Peregonow, N Kim, H Noh, S Palur, S Raicu, I AF Timm, S. Garzoglio, G. Mhashilkar, P. Boyd, J. Bernabeu, G. Sharma, N. Peregonow, N. Kim, H. Noh, S. Palur, S. Raicu, I. GP IOP TI Cloud services for the Fermilab scientific stakeholders SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB As part of the Fermilab/KISTI cooperative research project, Fermilab has successfully run an experimental simulation workflow at scale on a federation of Amazon Web Services (AWS), FermiCloud, and local FermiGrid resources. We used the CernVM-FS (CVMFS) file system to deliver the application software. We established Squid caching servers in AWS as well, using the Shoal system to let each individual virtual machine find the closest squid server. We also developed an automatic virtual machine conversion system so that we could transition virtual machines made on FermiCloud to Amazon Web Services. We used this system to successfully run a cosmic ray simulation of the NOvA detector at Fermilab, making use of both AWS spot pricing and network bandwidth discounts to minimize the cost. On FermiCloud we also were able to run the workflow at the scale of 1000 virtual machines, using a private network routable inside of Fermilab. We present in detail the technological improvements that were used to make this work a reality. C1 [Timm, S.; Garzoglio, G.; Mhashilkar, P.; Boyd, J.; Bernabeu, G.; Sharma, N.; Peregonow, N.; Kim, H.] Fermilab Natl Accelerator Lab, Div Comp Sci, Batavia, IL 60510 USA. [Noh, S.] Korea Inst Sci & Technol Informat, Global Sci Expt Data Hub Ctr, Seoul, South Korea. [Palur, S.; Raicu, I.] IIT, Dept Comp Sci, Chicago, IL 60616 USA. RP Mhashilkar, P (reprint author), Fermilab Natl Accelerator Lab, Div Comp Sci, Batavia, IL 60510 USA. EM timm@fnal.gov; garzoglio@fnal.gov; parag@fnal.gov; boyd@fnal.gov; gerard1@fnal.gov; neha@fnal.gov; njp@fnal.gov; hyunwoo@fnal.gov; rsyoung@kisti.re.kr; psandeep@hawk.iit.edu; iraicu@cs.iit.edu NR 6 TC 0 Z9 0 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 022039 DI 10.1088/1742-6596/664/2/022039 PG 7 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140600041 ER PT S AU Uram, TD Childers, JT LeCompte, TJ Papka, ME Benjamin, D AF Uram, T. D. Childers, J. T. LeCompte, T. J. Papka, M. E. Benjamin, D. GP IOP TI Achieving production-level use of HEP software at the Argonne Leadership Computing Facility SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB HEP's demand for computing resources has grown beyond the capacity of the Grid, and these demands will accelerate with the higher energy and luminosity planned for Run II. Mira, the ten petaFLOPs supercomputer at the Argonne Leadership Computing Facility, is a potentially significant compute resource for HEP research. Through an award of fifty million hours on Mira, we have delivered millions of events to LHC experiments by establishing the means of marshaling jobs through serial stages on local clusters, and parallel stages on Mira. We are running several HEP applications, including Alpgen, Pythia, Sherpa, and Geant4. Event generators, such as Sherpa, typically have a split workload: a small scale integration phase, and a second, more scalable, event-generation phase. To accommodate this workload on Mira we have developed two Python-based Django applications, Balsam and ARGO. Balsam is a generalized scheduler interface which uses a plugin system for interacting with scheduler software such as HTCondor, Cobalt, and TORQUE. ARGO is a workflow manager that submits jobs to instances of Balsam. Through these mechanisms, the serial and parallel tasks within jobs are executed on the appropriate resources. This approach and its integration with the PanDA production system will be discussed. C1 [Uram, T. D.; Childers, J. T.; LeCompte, T. J.; Papka, M. E.] Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. [Papka, M. E.] No Illinois Univ, De Kalb, IL 60115 USA. [Benjamin, D.] Duke Univ, Durham, NC USA. RP Uram, TD (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. EM turam@anl.gov; jchilders@anl.gov; lecompte@anl.gov; papka@anl.gov; benjamin@phy.duke.edu NR 8 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 062063 DI 10.1088/1742-6596/664/6/062063 PG 6 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140602053 ER PT S AU van Gemmeren, P Cranshaw, J Malon, D Vaniachine, A AF van Gemmeren, P. Cranshaw, J. Malon, D. Vaniachine, A. CA ATLAS Collaboration GP IOP TI ATLAS Metadata Infrastructure Evolution for Run 2 and Beyond SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB ATLAS developed and employed for Run 1 of the Large Hadron Collider a sophisticated infrastructure for metadata handling in event processing jobs. This infrastructure profits from a rich feature set provided by the ATLAS execution control framework, including standardized interfaces and invocation mechanisms for tools and services, segregation of transient data stores with concomitant object lifetime management, and mechanisms for handling occurrences asynchronous to the control framework's state machine transitions. This metadata infrastructure is evolving and being extended for Run 2 to allow its use and reuse in downstream physics analyses, analyses that may or may not utilize the ATLAS control framework. At the same time, multiprocessing versions of the control framework and the requirements of future multithreaded frameworks are leading to redesign of components that use an incident-handling approach to asynchrony. The increased use of scatter-gather architectures, both local and distributed, requires further enhancement of metadata infrastructure in order to ensure semantic coherence and robust bookkeeping. This paper describes the evolution of ATLAS metadata infrastructure for Run 2 and beyond, including the transition to dual-use tools-tools that can operate inside or outside the ATLAS control framework-and the implications thereof. It further examines how the design of this infrastructure is changing to accommodate the requirements of future frameworks and emerging event processing architectures. C1 [van Gemmeren, P.; Cranshaw, J.; Malon, D.; Vaniachine, A.] Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. RP van Gemmeren, P (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. EM gemmeren@anl.gov NR 5 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 072051 DI 10.1088/1742-6596/664/7/072051 PG 7 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140603010 ER PT S AU Wenzel, H Yarba, J Dotti, A AF Wenzel, H. Yarba, J. Dotti, A. GP IOP TI The Geant4 physics validation repository SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB The Geant4 collaboration regularly performs validation and regression tests. The results are stored in a central repository and can be easily accessed via a web application. In this article we describe the Geant4 physics validation repository which consists of a relational database storing experimental data and Geant4 test results, a java APT and a web application. The functionality of these components and the technology choices we made are also described. C1 [Wenzel, H.; Yarba, J.] Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. [Dotti, A.] SLAG Natl Accelerator Lab, Menlo Pk, CA 94025 USA. RP Wenzel, H (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM wenzel@fnal.gov NR 5 TC 1 Z9 1 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 062066 DI 10.1088/1742-6596/664/6/062066 PG 8 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140602056 ER PT S AU Zaytsevl, A Ito, H Hollowell, C Wong, T Rao, T AF Zaytsevl, A. Ito, H. Hollowell, C. Wong, T. Rao, T. GP IOP TI Current Status of the Ceph Based Storage Systems at the RACF SO 21ST INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP2015), PARTS 1-9 SE Journal of Physics Conference Series LA English DT Proceedings Paper CT 21st International Conference on Computing in High Energy and Nuclear Physics (CHEP) CY APR 13-17, 2015 CL Okinawa, JAPAN AB Ceph based storage solutions are becoming increasingly popular within the HEP/NP community over the last few years. With the current status of Ceph project, both object storage and block storage (RBD) layers are production ready on a large scale, and the Ceph file system storage layer (CephFS) is rapidly getting to that state as well. This contribution contains a thorough review of various functionality, performance and stability tests performed with all three (object storage, block storage and file system) levels of Ceph by using the RACF computing resources in 2012-2014 on various hardware platforms and with different networking solutions (10/40 GbE and IPoIB/4X FDR Infiniband based). We also report the status of commissioning a large scale (1 PB of usable capacity, 4k HDDs behind the RAID arrays by design) Ceph based object storage system provided with Amazon S3 complaint RadosGW interfaces deployed in RACF, as well as performance results obtained while testing the RBD and CephFS storage layers of our Ceph clusters. C1 [Zaytsevl, A.; Ito, H.; Hollowell, C.; Wong, T.; Rao, T.] Brookhaven Natl Lab, Upton, NY 11973 USA. RP Zaytsevl, A (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. EM hito@bnl.gov NR 3 TC 0 Z9 0 U1 1 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 1742-6588 J9 J PHYS CONF SER PY 2015 VL 664 AR 042027 DI 10.1088/1742-6596/664/4/042027 PG 8 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4TH UT WOS:000372140601016 ER PT S AU Nathan, J Masson, C Dufresne, L Churchfield, M AF Nathan, Joern Masson, Christian Dufresne, Louis Churchfield, Matthew BE Churchfield, MJ TI Analysis of the sweeped actuator line method SO 2ND SYMPOSIUM ON OPENFOAM(R) IN WIND ENERGY SE E3S Web of Conferences LA English DT Proceedings Paper CT 2nd Symposium on OpenFOAM (R) in Wind Energy (SOWE) CY MAY 19-21, 2014 CL Natl Renewable Energy Lab, Boulder, CO SP Univ Colorado, Renewable & Sustainable Energy Inst HO Natl Renewable Energy Lab AB The actuator line method made it possible to describe the near wake of a wind turbine more accurately than with the actuator disk method. Whereas the actuator line generates the helicoidal vortex system shed from the tip blades, the actuator disk method sheds a vortex sheet from the edge of the rotor plane. But with the actuator line come also temporal and spatial constraints, such as the need for a much smaller time step than with actuator disk. While the latter one only has to obey the Courant-Friedrichs-Lewy condition, the former one is also restricted by the grid resolution and the rotor tip-speed. Additionally the spatial resolution has to be finer for the actuator line than with the actuator disk, for well resolving the tip vortices. Therefore this work is dedicated to examining a method in between of actuator line and actuator disk, which is able to model the transient behaviour, such as the rotating blades, but which also relaxes the temporal constraint. Therefore a larger time-step is used and the blade forces are swept over a certain area. The main focus of this article is on the aspect of the blade tip vortex generation in comparison with the standard actuator line and actuator disk. C1 [Nathan, Joern; Masson, Christian; Dufresne, Louis] Ecole Technol Super, Montreal, PQ, Canada. [Churchfield, Matthew] Natl Renewable Energy Lab, Golden, CO USA. RP Nathan, J (reprint author), Ecole Technol Super, Montreal, PQ, Canada. EM joern.nathan.1@ens.etsmtl.ca NR 11 TC 0 Z9 0 U1 0 U2 0 PU E D P SCIENCES PI CEDEX A PA 17 AVE DU HOGGAR PARC D ACTIVITES COUTABOEUF BP 112, F-91944 CEDEX A, FRANCE SN 2267-1242 J9 E3S WEB CONF PY 2015 VL 5 AR 01001 DI 10.1051/c3sconf/20150501001 PG 8 WC Energy & Fuels; Environmental Sciences; Geosciences, Multidisciplinary SC Energy & Fuels; Environmental Sciences & Ecology; Geology GA BE5MF UT WOS:000373018900001 ER PT J AU Ryan, D Finnan, J AF Ryan, Declan Finnan, John TI LOW LOSSES OF P AND SEDIMENT IN OVERLAND FLOW SUGGEST THAT THIS TILLAGE SITE AND OTHERS LIKE IT MAY NOT BE HIGH RISK FOR PHOSPHORUS POLLUTION SO BIOLOGY AND ENVIRONMENT-PROCEEDINGS OF THE ROYAL IRISH ACADEMY LA English DT Article ID SOIL-EROSION; AGRICULTURAL CATCHMENT; SURFACE RUNOFF; TRANSPORT; MOBILIZATION; SCOTLAND; IRELAND; BELGIUM; SYSTEMS; SWEDEN AB This trial examined phosphorus (P) loss in overland flow (OLF) at a tillage farm in the southeast of Ireland. The soil was a grey-brown podzolic, and was representative of land covering 16% of the total agricultural area, with tillage practised on approximately one-third of this area. The object of the trial was to establish whether this site is a P-pollution risk to surface water. The productive tillage field was divided into three plots, each of approximately 1ha in size. Plots had low earth dams and open lined drains on the lower boundaries. A flow meter sampler with V-notch tank was connected to each of the three drains. Macro-pore flow (MPF) samplers were installed in the plots. Average depth of overland flow across the three plots was 5.4, 17.5 and 18.1mm y(-1) for 2005, 2006 and 2007, respectively. Phosphorus concentration was 1.01, 0.64 and 0.6mg 1(-1), respectively, and P load was 0.04, 0.11 and 0.18kg ha(-1) y(-1). The median P concentration in MPF was 1.59mg 1(-1). Sediment yield (95kg ha(-1) y(-1)) was low compared to that achieved in other studies. No pollution parameter measured represented a serious pollution threat. The results of this study suggest that a large proportion of tillage land in Ireland might be classified as low risk for P loss through the overland flow pathway. C1 [Ryan, Declan; Finnan, John] TEAGASC, Crops Res Ctr, Oak Pk, Carlow, Ireland. RP Ryan, D (reprint author), TEAGASC, Crops Res Ctr, Oak Pk, Carlow, Ireland. EM declan.ryan@teagasc.ie NR 27 TC 1 Z9 1 U1 1 U2 1 PU ROYAL IRISH ACAD PI DUBLIN PA 19 DAWSON STREET, DUBLIN 2, IRELAND SN 0791-7945 EI 2009-003X J9 BIOL ENVIRON JI Biol. Environ.-Proc. R. Irish Acad. PY 2015 VL 115B IS 3 BP 221 EP 231 DI 10.3318/BIOE.2015.21 PG 11 WC Biology; Environmental Sciences SC Life Sciences & Biomedicine - Other Topics; Environmental Sciences & Ecology GA DH5UO UT WOS:000372857700006 ER PT B AU Katoh, Y AF Katoh, Yutai BE Bansal, NP Lamon, J TI RADIATION EFFECTS SO CERAMIC MATRIX COMPOSITES: MATERIALS, MODELING AND TECHNOLOGY LA English DT Article; Book Chapter ID SILICON-CARBIDE COMPOSITES; CERAMIC-MATRIX COMPOSITES; CARBON-FIBER COMPOSITE; NEUTRON-IRRADIATION; MECHANICAL-PROPERTIES; SIC/SIC COMPOSITES; NUCLEAR GRAPHITE; NITRIDE CERAMICS; SIC COMPOSITES; BEHAVIOR C1 [Katoh, Yutai] Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN USA. RP Katoh, Y (reprint author), Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN USA. NR 53 TC 0 Z9 0 U1 0 U2 0 PU JOHN WILEY & SONS INC PI HOBOKEN PA 111 RIVER ST, HOBOKEN, NJ 07030 USA BN 978-1-118-83299-8; 978-1-118-23116-6 PY 2015 BP 389 EP 404 PG 16 WC Materials Science, Ceramics; Materials Science, Composites SC Materials Science GA BE3XU UT WOS:000371347800014 ER PT J AU Sukumar, SR Natarajan, R Ferrell, RK AF Sukumar, Sreenivas R. Natarajan, Ramachandran Ferrell, Regina K. TI Quality of Big Data in health care SO INTERNATIONAL JOURNAL OF HEALTH CARE QUALITY ASSURANCE LA English DT Article DE Data handling; Big Data analytics; Data quality; Health care analytics; Health information technology; Health care claims ID FRAMEWORK; JAPAN AB Purpose - The current trend in Big Data analytics and in particular health information technology is toward building sophisticated models, methods and tools for business, operational and clinical intelligence. However, the critical issue of data quality required for these models is not getting the attention it deserves. The purpose of this paper is to highlight the issues of data quality in the context of Big Data health care analytics. Design/methodology/approach - The insights presented in this paper are the results of analytics work that was done in different organizations on a variety of health data sets. The data sets include Medicare and Medicaid claims, provider enrollment data sets from both public and private sources, electronic health records from regional health centers accessed through partnerships with health care claims processing entities under health privacy protected guidelines. Findings - Assessment of data quality in health care has to consider: first, the entire lifecycle of health data; second, problems arising from errors and inaccuracies in the data itself; third, the source(s) and the pedigree of the data; and fourth, how the underlying purpose of data collection impact the analytic processing and knowledge expected to be derived. Automation in the form of data handling, storage, entry and processing technologies is to be viewed as a double-edged sword. At one level, automation can be a good solution, while at another level it can create a different set of data quality issues. Implementation of health care analytics with Big Data is enabled by a road map that addresses the organizational and technological aspects of data quality assurance. Practical implications - The value derived from the use of analytics should be the primary determinant of data quality. Based on this premise, health care enterprises embracing Big Data should have a road map for a systematic approach to data quality. Health care data quality problems can be so very specific that organizations might have to build their own custom software or data quality rule engines. Originality/value - Today, data quality issues are diagnosed and addressed in a piece-meal fashion. The authors recommend a data lifecycle approach and provide a road map, that is more appropriate with the dimensions of Big Data and fits different stages in the analytical workflow. C1 [Sukumar, Sreenivas R.] Oak Ridge Natl Lab, Computat Sci & Engn Div, Oak Ridge, TN USA. [Natarajan, Ramachandran] Tennessee Technol Univ, Dept Decis Sci & Management, Cookeville, TN 38505 USA. [Ferrell, Regina K.] Oak Ridge Natl Lab, Elect & Elect Syst Res Div, Oak Ridge, TN USA. RP Natarajan, R (reprint author), Tennessee Technol Univ, Dept Decis Sci & Management, Cookeville, TN 38505 USA. EM RNAT@tntech.edu NR 51 TC 4 Z9 4 U1 6 U2 27 PU EMERALD GROUP PUBLISHING LTD PI BINGLEY PA HOWARD HOUSE, WAGON LANE, BINGLEY BD16 1WA, W YORKSHIRE, ENGLAND SN 0952-6862 EI 1758-6542 J9 INT J HEALTH CARE Q JI Int. J. Health Care Qual. Assur. PY 2015 VL 28 IS 6 BP 621 EP + DI 10.1108/IJHCQA-07-2014-0080 PG 15 WC Health Policy & Services SC Health Care Sciences & Services GA DH8FT UT WOS:000373029600005 PM 26156435 ER PT S AU Menjo, H Adriani, O Berti, E Bonechi, L Bongi, M Castellini, G D'Alessandro, R Del Prete, M Haguenauer, M Itow, Y Kasahara, K Kawade, K Makino, Y Masuda, K Matsubayashi, E Mitsuka, G Muraki, Y Papini, P Perrot, AL Pfeiffer, D Ricciarini, S Sako, T Shimizu, Y Sugiura, Y Suzuki, T Tamura, T Tiberio, A Torii, S Tricomi, A Turner, WC Zhou, Q AF Menjo, H. Adriani, O. Berti, E. Bonechi, L. Bongi, M. Castellini, G. D'Alessandro, R. Del Prete, M. Haguenauer, M. Itow, Y. Kasahara, K. Kawade, K. Makino, Y. Masuda, K. Matsubayashi, E. Mitsuka, G. Muraki, Y. Papini, P. Perrot, A-L Pfeiffer, D. Ricciarini, S. Sako, T. Shimizu, Y. Sugiura, Y. Suzuki, T. Tamura, T. Tiberio, A. Torii, S. Tricomi, A. Turner, W. C. Zhou, Q. BE Berge, D DeRoeck, A Mangano, M Pattison, B TI Recent results from LHCf SO 18TH INTERNATIONAL SYMPOSIUM ON VERY HIGH ENERGY COSMIC RAY INTERACTIONS (ISVHECRI 2014) SE EPJ Web of Conferences LA English DT Proceedings Paper CT 18th International Symposium on Very High Energy Cosmic Ray Interactions (ISVHECRI) CY AUG 18-22, 2014 CL CERN, Geneva, SWITZERLAND HO CERN ID PROTON-PROTON COLLISIONS; PHOTON ENERGY-SPECTRA AB The LHCf experiment is one of the LHC forward experiments. The aim of LHCf is to provide critical calibration data of hadronic intraction models used in air shower simulations. The LHCf has completed the operations for p-p collisions with a collision energy of root s = 0.9 and 7 TeV p-p in 2010 and for p-Pb collisions with a collision energy per nucleon of root s(NN) = 5.02. The recent LHCf result of forward neutron energy spectra at 7 TeV p-p collision and forward pi(0) spectra at p-Pb collisions are presented in this paper. C1 [Menjo, H.] Nagoya Univ, Grad Sch Sci, Nagoya, Aichi 4648601, Japan. [Adriani, O.; Berti, E.; Bonechi, L.; Bongi, M.; D'Alessandro, R.; Del Prete, M.; Papini, P.; Ricciarini, S.; Tiberio, A.] Ist Nazl Fis Nucl, Sect Florence, Florence, Italy. [Adriani, O.; Berti, E.; Bongi, M.; D'Alessandro, R.; Del Prete, M.; Tiberio, A.] Univ Florence, Dept Phys & Astron, I-50121 Florence, Italy. [Castellini, G.; Ricciarini, S.] CNR, IFAC, I-00185 Rome, Italy. [Haguenauer, M.] Ecole Polytech, F-91128 Palaiseau, France. [Itow, Y.; Kawade, K.; Makino, Y.; Masuda, K.; Matsubayashi, E.; Mitsuka, G.; Muraki, Y.; Sako, T.; Sugiura, Y.; Zhou, Q.] Nagoya Univ, Solar Terr Environm Lab, Nagoya, Aichi 4648601, Japan. [Itow, Y.; Sako, T.] Nagoya Univ, Kobayashi Maskawa Inst Origin Particles & Univers, Nagoya, Aichi 4648601, Japan. [Kasahara, K.; Suzuki, T.; Torii, S.] Waseda Univ, RISE, Tokyo, Japan. [Perrot, A-L; Pfeiffer, D.] CERN, CH-1211 Geneva 23, Switzerland. [Shimizu, Y.] JAXA, Tokyo, Japan. [Tamura, T.] Kanagawa Univ, Kanagawa, Japan. [Tricomi, A.] Ist Nazl Fis Nucl, Sect Catania, Catania, Italy. [Tricomi, A.] Univ Catania, I-95124 Catania, Italy. [Turner, W. C.] LBNL, Berkeley, CA USA. RP Menjo, H (reprint author), Nagoya Univ, Grad Sch Sci, Nagoya, Aichi 4648601, Japan. EM menjo@stelab.nagoya-u.ac.jp RI Bongi, Massimo/L-9417-2015; OI Bongi, Massimo/0000-0002-6050-1937; Ricciarini, Sergio Bruno/0000-0001-6176-3368 NR 13 TC 0 Z9 0 U1 1 U2 1 PU E D P SCIENCES PI CEDEX A PA 17 AVE DU HOGGAR PARC D ACTIVITES COUTABOEUF BP 112, F-91944 CEDEX A, FRANCE SN 2100-014X BN 978-2-7598-1722-1 J9 EPJ WEB CONF PY 2015 VL 99 AR 08004 DI 10.1051/epjconf/20159908004 PG 4 WC Physics, Particles & Fields SC Physics GA BE5BD UT WOS:000372490400019 ER PT S AU Chamanzar, M Garfield, DJ Iafrati, J Sohal, V Chan, E Cohen, B Schuck, PJ Maharbiz, MM AF Chamanzar, Maysamreza Garfield, David J. Iafrati, Jillian Sohal, Vikaas Chan, Emory Cohen, Bruce Schuck, P. James Maharbiz, Michel M. GP IEEE TI Deep Tissue Targeted Near-infrared Optogenetic Stimulation using Fully Implantable Upconverting Light Bulbs SO 2015 37TH ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY (EMBC) SE IEEE Engineering in Medicine and Biology Society Conference Proceedings LA English DT Proceedings Paper CT 37th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC) CY AUG 25-29, 2015 CL Milan, ITALY ID NEURONS AB We demonstrate for the first time, the possibility of targeted optogenetic stimulation of neurons deep into brain tissue (>2 mm) in a minimally-invasive way by sending near-infrared light through tissue to excite passive lanthanide-doped blue-emitting upconverting nanocrystals (UCNPs) encapsulated in Parylene C microstructure light bulbs that emit visible (blue) light and locally excite opsins with high spatial resolution. C1 [Chamanzar, Maysamreza; Maharbiz, Michel M.] Univ Calif Berkeley, Berkeley, CA 94720 USA. [Garfield, David J.; Chan, Emory; Cohen, Bruce; Schuck, P. James] Lawrence Berkeley Natl Lab, Mol Foundry, Berkeley, CA USA. [Iafrati, Jillian; Sohal, Vikaas] Univ Calif San Francisco, San Francisco, CA 94143 USA. RP Chamanzar, M (reprint author), Univ Calif Berkeley, Berkeley, CA 94720 USA. EM chamanzar@berkeley.edu NR 10 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1557-170X BN 978-1-4244-9270-1 J9 IEEE ENG MED BIO PY 2015 BP 821 EP 824 PG 4 WC Engineering, Biomedical; Engineering, Electrical & Electronic SC Engineering GA BE4HD UT WOS:000371717201029 ER PT S AU Farhang-Boroujeny, B Moradi, H AF Farhang-Boroujeny, Behrouz Moradi, Hussein GP IEEE TI Derivation of GFDM Based on OFDM Principles SO 2015 IEEE INTERNATIONAL CONFERENCE ON COMMUNICATIONS (ICC) SE IEEE International Conference on Communications LA English DT Proceedings Paper CT IEEE International Conference on Communications (ICC) CY JUN 08-12, 2015 CL London, ENGLAND SP IEEE ID DESIGN AB This paper starts with presenting a fundamental principle based on which the celebrated orthogonal frequency division multiplexing (OFDM) waveform is constructed. It then extends the same principle to construct the newly introduced generalized frequency division multiplexing (GFDM) signals. This novel derivation sheds light on some interesting properties of GFDM. In particular, our derivation seamlessly leads to an implementation of GFDM transmitter which has significantly lower complexity than what has been reported so far. Our derivation also facilitates a trivial understanding of how GFDM (similar to OFDM) can be applied in MIMO channels. C1 [Farhang-Boroujeny, Behrouz] Univ Utah, ECE Dept, Salt Lake City, UT 84112 USA. [Moradi, Hussein] Idaho Natl Lab, Idaho Falls, ID USA. RP Farhang-Boroujeny, B (reprint author), Univ Utah, ECE Dept, Salt Lake City, UT 84112 USA. NR 14 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1550-3607 BN 978-1-4673-6432-4 J9 IEEE ICC PY 2015 BP 2680 EP 2685 PG 6 WC Telecommunications SC Telecommunications GA BE4GT UT WOS:000371708102146 ER PT S AU Cady, CM Liu, C Lovato, ML AF Cady, Carl M. Liu, Cheng Lovato, Manuel L. BE Cadoni, E TI Determination of dynamic fracture toughness using a new experimental technique SO DYMAT 2015 - 11TH INTERNATIONAL CONFERENCE ON THE MECHANICAL AND PHYSICAL BEHAVIOUR OF MATERIALS UNDER DYNAMIC LOADING SE EPJ Web of Conferences LA English DT Proceedings Paper CT 11th International Conference on the Mechanical and Physical Behaviour of Materials under Dynamic Loading (DYMAT) CY SEP 07-11, 2015 CL Lugano, SWITZERLAND SP Univ Appl Sci & Arts So Switzerland, DynaMat Lab ID BRAZILIAN DISK; LOADING-RATE; BEHAVIOR; CRACK AB In other studies dynamic fracture toughness has been measured using Charpy impact and modified Hopkinson Bar techniques. In this paper results will be shown for the measurement of fracture toughness using a new test geometry. The crack propagation velocities range from similar to 0.15 mm/s to 2.5 m/s. Digital image correlation (DIC) will be the technique used to measure both the strain and the crack growth rates. The boundary of the crack is determined using the correlation coefficient generated during image analysis and with interframe timing the crack growth rate and crack opening can be determined. A comparison of static and dynamic loading experiments will be made for brittle polymeric materials. The analysis technique presented by Sammis et al. [1] is a semi-empirical solution, however, additional Linear Elastic Fracture Mechanics analysis of the strain fields generated as part of the DIC analysis allow for the more commonly used method resembling the crack tip opening displacement (CTOD) experiment. It should be noted that this technique was developed because limited amounts of material were available and crack growth rates were to fast for a standard CTOD method. C1 [Cady, Carl M.; Liu, Cheng; Lovato, Manuel L.] Los Alamos Natl Lab, MST 8,MS G755, Los Alamos, NM 87545 USA. RP Cady, CM (reprint author), Los Alamos Natl Lab, MST 8,MS G755, Los Alamos, NM 87545 USA. EM cady@lanl.gov NR 11 TC 0 Z9 0 U1 2 U2 3 PU E D P SCIENCES PI CEDEX A PA 17 AVE DU HOGGAR PARC D ACTIVITES COUTABOEUF BP 112, F-91944 CEDEX A, FRANCE SN 2100-014X BN 978-2-7598-1817-4 J9 EPJ WEB CONF PY 2015 VL 94 AR 01012 DI 10.1051/epjconf/20159401012 PG 6 WC Engineering, Mechanical; Materials Science, Multidisciplinary SC Engineering; Materials Science GA BE5CS UT WOS:000372587700012 ER PT S AU Cerreta, EK Gray, GT Trujillo, CP Potocki, ML Vachhani, S Martinez, DT Lovato, ML AF Cerreta, Ellen K. Gray, George T., III Trujillo, Carl P. Potocki, Mark L. Vachhani, Shraddha Martinez, Daniel T. Lovato, Manual L. BE Cadoni, E TI Strength and failure of a damaged material SO DYMAT 2015 - 11TH INTERNATIONAL CONFERENCE ON THE MECHANICAL AND PHYSICAL BEHAVIOUR OF MATERIALS UNDER DYNAMIC LOADING SE EPJ Web of Conferences LA English DT Proceedings Paper CT 11th International Conference on the Mechanical and Physical Behaviour of Materials under Dynamic Loading (DYMAT) CY SEP 07-11, 2015 CL Lugano, SWITZERLAND SP Univ Appl Sci & Arts So Switzerland, DynaMat Lab ID PEAK PRESSURE; TANTALUM; EVOLUTION; BEHAVIOR; ALLOYS; SHEAR AB Under complex, dynamic loading conditions, damage can occur within a material. Should this damage not lead to catastrophic failure, the material can continue to sustain further loading. However, little is understood about how to represent the mechanical response of a material that has experienced dynamic loading leading to incipient damage. Here, this effect is examined in copper. Copper is shock loaded to impart an incipient state of damage to the material. Thereafter compression and tensile specimens were sectioned from the dynamically damaged specimen to quantify the subsequent properties of the material in the region of intense incipient damage and in regions far from the damage. It is observed that enhanced yield stresses result from the damaged material even over material, which has simply been shock loaded and not damaged. These results are rationalized in terms of stored plastic work due to the damage process. C1 [Cerreta, Ellen K.; Gray, George T., III; Trujillo, Carl P.; Vachhani, Shraddha; Martinez, Daniel T.; Lovato, Manual L.] Los Alamos Natl Lab, MST 8, POB 1663, Los Alamos, NM 87545 USA. [Potocki, Mark L.] Los Alamos Natl Lab, XTD PRI, Los Alamos, NM 87545 USA. RP Cerreta, EK (reprint author), Los Alamos Natl Lab, MST 8, POB 1663, Los Alamos, NM 87545 USA. EM ecerreta@lanl.gov NR 16 TC 0 Z9 0 U1 0 U2 1 PU E D P SCIENCES PI CEDEX A PA 17 AVE DU HOGGAR PARC D ACTIVITES COUTABOEUF BP 112, F-91944 CEDEX A, FRANCE SN 2100-014X BN 978-2-7598-1817-4 J9 EPJ WEB CONF PY 2015 VL 94 AR 02015 DI 10.1051/epjconf/20159402015 PG 5 WC Engineering, Mechanical; Materials Science, Multidisciplinary SC Engineering; Materials Science GA BE5CS UT WOS:000372587700095 ER PT S AU Fensin, SJ Walker, EK Cerreta, EK Gray, GT AF Fensin, S. J. Walker, E. K. Cerreta, E. K. Gray, G. T., III BE Cadoni, E TI When do interfaces become important for failure? SO DYMAT 2015 - 11TH INTERNATIONAL CONFERENCE ON THE MECHANICAL AND PHYSICAL BEHAVIOUR OF MATERIALS UNDER DYNAMIC LOADING SE EPJ Web of Conferences LA English DT Proceedings Paper CT 11th International Conference on the Mechanical and Physical Behaviour of Materials under Dynamic Loading (DYMAT) CY SEP 07-11, 2015 CL Lugano, SWITZERLAND SP Univ Appl Sci & Arts So Switzerland, DynaMat Lab ID DYNAMIC FRACTURE; COPPER; BEHAVIOR; SOLIDS AB Previous experimental research has shown that microstructural features such as interfaces, inclusions, vacancies and heterogeneities can all act as void nucleation sites. However, it is not well understood how important these interfaces are to the damage evolution as a function of the surrounding parent materials. In this work, we present results on three different materials: 1) Cu, 2) Cu-10 wt% Ag, and 3) Cu-15 wt% Nb examined to probe the influence of bi-metal interfaces on void nucleation and evolution. These materials were chosen due to the differences in the stacking fault energy between the two phases. The initial results suggest that when there are significant differences between the bulk properties (for example: stacking fault energy and melting temperature etc) the type of interface between the two parent materials does not influence the damage process. Rather, it is the "weaker" material that dictates the dynamic spall strength of the material. C1 [Fensin, S. J.; Walker, E. K.; Cerreta, E. K.; Gray, G. T., III] Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87544 USA. [Walker, E. K.] Purdue Univ, Sch Mat Engn, W Lafayette, IN 47907 USA. RP Fensin, SJ (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87544 USA. EM saryuj@lanl.gov NR 20 TC 0 Z9 0 U1 1 U2 3 PU E D P SCIENCES PI CEDEX A PA 17 AVE DU HOGGAR PARC D ACTIVITES COUTABOEUF BP 112, F-91944 CEDEX A, FRANCE SN 2100-014X BN 978-2-7598-1817-4 J9 EPJ WEB CONF PY 2015 VL 94 AR 02010 DI 10.1051/epjconf/20159402010 PG 6 WC Engineering, Mechanical; Materials Science, Multidisciplinary SC Engineering; Materials Science GA BE5CS UT WOS:000372587700090 ER PT S AU Gray, GT Livescu, V Rigg, PA Trujillo, CP Cady, CM Chen, SR Carpenter, JS Lienert, TJ Fensin, S AF Gray, G. T., III Livescu, V. Rigg, P. A. Trujillo, C. P. Cady, C. M. Chen, S. R. Carpenter, J. S. Lienert, T. J. Fensin, S. BE Cadoni, E TI Structure/property (constitutive and dynamic strength/damage) characterization of additively manufactured 316L SS SO DYMAT 2015 - 11TH INTERNATIONAL CONFERENCE ON THE MECHANICAL AND PHYSICAL BEHAVIOUR OF MATERIALS UNDER DYNAMIC LOADING SE EPJ Web of Conferences LA English DT Proceedings Paper CT 11th International Conference on the Mechanical and Physical Behaviour of Materials under Dynamic Loading (DYMAT) CY SEP 07-11, 2015 CL Lugano, SWITZERLAND SP Univ Appl Sci & Arts So Switzerland, DynaMat Lab ID STAINLESS-STEEL PARTS AB For additive manufacturing (AM), the certification and qualification paradigm needs to evolve as there exists no "ASTM-type" additive manufacturing certified process or AM-material produced specifications. Accordingly, utilization of AM materials to meet engineering applications requires quantification of the constitutive properties of these evolving materials in comparison to conventionally-manufactured metals and alloys. Cylinders of 316L SS were produced using a LENS MR-7 laser additive manufacturing system from Optomec (Albuquerque, NM) equipped with a 1kW Yb-fiber laser. The microstructure of the AM-316L SS is detailed in both the as-built condition and following heat-treatments designed to obtain full recrystallization. The constitutive behavior as a function of strain rate and temperature is presented and compared to that of nominal annealed wrought 316L SS plate. The dynamic damage evolution and failure response of all three materials was probed using flyer-plate impact driven spallation experiments at a peak stress of 4.5 GPa to examine incipient spallation response. The spall strength of AM-produced 316L SS was found to be very similar for the peak shock stress studied to that of annealed wrought or AM-316L SS following recrystallization. The damage evolution as a function of microstructure was characterized using optical metallography. C1 [Gray, G. T., III; Livescu, V.; Trujillo, C. P.; Cady, C. M.; Chen, S. R.; Carpenter, J. S.; Lienert, T. J.; Fensin, S.] Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. [Rigg, P. A.] Washington State Univ, Inst Shock Phys, Pullman, WA 99164 USA. RP Gray, GT (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. OI Carpenter, John/0000-0001-8821-043X NR 24 TC 2 Z9 2 U1 7 U2 23 PU E D P SCIENCES PI CEDEX A PA 17 AVE DU HOGGAR PARC D ACTIVITES COUTABOEUF BP 112, F-91944 CEDEX A, FRANCE SN 2100-014X BN 978-2-7598-1817-4 J9 EPJ WEB CONF PY 2015 VL 94 DI 10.1051/epjconf/20159402006 PG 6 WC Engineering, Mechanical; Materials Science, Multidisciplinary SC Engineering; Materials Science GA BE5CS UT WOS:000372587700086 ER PT S AU Key, CT Schumacher, SC Alexander, CS AF Key, Christopher T. Schumacher, Shane C. Alexander, C. Scott BE Cadoni, E TI Evaluation of a strain based failure criterion for the multi-constituent composite model under shock loading SO DYMAT 2015 - 11TH INTERNATIONAL CONFERENCE ON THE MECHANICAL AND PHYSICAL BEHAVIOUR OF MATERIALS UNDER DYNAMIC LOADING SE EPJ Web of Conferences LA English DT Proceedings Paper CT 11th International Conference on the Mechanical and Physical Behaviour of Materials under Dynamic Loading (DYMAT) CY SEP 07-11, 2015 CL Lugano, SWITZERLAND SP Univ Appl Sci & Arts So Switzerland, DynaMat Lab ID MULTICONTINUUM THEORY AB This study details and demonstrates a strain-based criterion for the prediction of polymer matrix composite material damage and failure under shock loading conditions. Shock loading conditions are characterized by high-speed impacts or explosive events that result in very high pressures in the materials involved. These material pressures can reach hundreds of kbar and often exceed the material strengths by several orders of magnitude. Researchers have shown that under these high pressures, composites exhibit significant increases in stiffness and strength. In this work we summarize modifications to a previous stress based interactive failure criterion based on the model initially proposed by Hashin, to include strain dependence. The failure criterion is combined with the multi-constituent composite constitutive model (MCM) within a shock physics hydrocode. The constitutive model allows for decomposition of the composite stress and strain fields into the individual phase averaged constituent level stress and strain fields, which are then applied to the failure criterion. Numerical simulations of a metallic sphere impacting carbon/epoxy composite plates at velocities up to 1000 m/s are performed using both the stress and strain based criterion. These simulation results are compared to experimental tests to illustrate the advantages of a strain-based criterion in the shock environment. C1 [Key, Christopher T.] HI TEST Labs Inc, Appl Technol Grp, 32 Murphys Dr, Groton, CT 06340 USA. [Schumacher, Shane C.; Alexander, C. Scott] Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Key, CT (reprint author), HI TEST Labs Inc, Appl Technol Grp, 32 Murphys Dr, Groton, CT 06340 USA. EM chris.key@hitestlabs.com NR 13 TC 0 Z9 0 U1 0 U2 0 PU E D P SCIENCES PI CEDEX A PA 17 AVE DU HOGGAR PARC D ACTIVITES COUTABOEUF BP 112, F-91944 CEDEX A, FRANCE SN 2100-014X BN 978-2-7598-1817-4 J9 EPJ WEB CONF PY 2015 VL 94 AR 04001 DI 10.1051/epjconf/20159404001 PG 6 WC Engineering, Mechanical; Materials Science, Multidisciplinary SC Engineering; Materials Science GA BE5CS UT WOS:000372587700113 ER PT S AU Nishida, E Song, B Maguire, M Adams, D Carroll, J Wise, J Bishop, J Palmer, T AF Nishida, Erik Song, Bo Maguire, Michael Adams, David Carroll, Jay Wise, Jack Bishop, Joseph Palmer, Todd BE Cadoni, E TI Dynamic compressive response of wrought and additive manufactured 304L stainless steels SO DYMAT 2015 - 11TH INTERNATIONAL CONFERENCE ON THE MECHANICAL AND PHYSICAL BEHAVIOUR OF MATERIALS UNDER DYNAMIC LOADING SE EPJ Web of Conferences LA English DT Proceedings Paper CT 11th International Conference on the Mechanical and Physical Behaviour of Materials under Dynamic Loading (DYMAT) CY SEP 07-11, 2015 CL Lugano, SWITZERLAND SP Univ Appl Sci & Arts So Switzerland, DynaMat Lab AB Additive manufacturing (AM) technology has been developed to fabricate metal components that include complex prototype fabrication, small lot production, precision repair or feature addition, and tooling. However, the mechanical response of the AM materials is a concern to meet requirements for specific applications. Differences between AM materials as compared to wrought materials might be expected, due to possible differences in porosity (voids), grain size, and residual stress levels. When the AM materials are designed for impact applications, the dynamic mechanical properties in both compression and tension need to be fully characterized and understood for reliable designs. In this study, a 304L stainless steel was manufactured with AM technology. For comparison purposes, both the AM and wrought 304L stainless steels were dynamically characterized in compression Kolsky bar techniques. They dynamic compressive stress-strain curves were obtained and the strain rate effects were determined for both the AM and wrought 304L stainless steels. A comprehensive comparison of dynamic compressive response between the AM and wrought 304L stainless steels was performed. SAND2015-0993 C. C1 [Nishida, Erik; Song, Bo; Maguire, Michael; Adams, David; Carroll, Jay; Wise, Jack; Bishop, Joseph] Sandia Natl Labs, 1515 Eubank Blvd SE, Albuquerque, NM 87123 USA. [Palmer, Todd] Penn State Univ, MatSE Dept, University Pk, PA 16802 USA. RP Nishida, E (reprint author), Sandia Natl Labs, 1515 Eubank Blvd SE, Albuquerque, NM 87123 USA. EM eenishi@sandia.gov NR 4 TC 0 Z9 0 U1 7 U2 15 PU E D P SCIENCES PI CEDEX A PA 17 AVE DU HOGGAR PARC D ACTIVITES COUTABOEUF BP 112, F-91944 CEDEX A, FRANCE SN 2100-014X BN 978-2-7598-1817-4 J9 EPJ WEB CONF PY 2015 VL 94 AR 01001 DI 10.1051/epjconf/20159401001 PG 4 WC Engineering, Mechanical; Materials Science, Multidisciplinary SC Engineering; Materials Science GA BE5CS UT WOS:000372587700001 ER PT S AU Song, B Nelson, K Lipinski, R Bignell, J Ulrich, GB George, EP AF Song, Bo Nelson, Kevin Lipinski, Ronald Bignell, John Ulrich, G. B. George, E. P. BE Cadoni, E TI Dynamic high-temperature Kolsky tension bar techniques SO DYMAT 2015 - 11TH INTERNATIONAL CONFERENCE ON THE MECHANICAL AND PHYSICAL BEHAVIOUR OF MATERIALS UNDER DYNAMIC LOADING SE EPJ Web of Conferences LA English DT Proceedings Paper CT 11th International Conference on the Mechanical and Physical Behaviour of Materials under Dynamic Loading (DYMAT) CY SEP 07-11, 2015 CL Lugano, SWITZERLAND SP Univ Appl Sci & Arts So Switzerland, DynaMat Lab ID STRAIN RATES; BEHAVIOR; STEEL AB Kolsky tension bar techniques were modified for dynamic high-temperature tensile characterization of thin-sheet alloys. An induction coil heater was used to heat the specimen while a cooling system was applied to keep the bars at room temperature during heating. A preload system was developed to generate a small pretension load in the bar system during heating in order to compensate for the effect of thermal expansion generated in the high-temperature tensile specimen. A laser system was applied to directly measure the displacements at both ends of the tensile specimen in order to calculate the strain in the specimen. A pair of high-sensitivity semiconductor strain gages was used to measure the weak transmitted force due to the low flow stress in the thin specimen at elevated temperatures. As an example, the high-temperature Kolsky tension bar was used to characterize a DOP-26 iridium alloy in high-strain-rate tension at 860 s(-1)/1030 degrees C. C1 [Song, Bo; Lipinski, Ronald; Bignell, John] Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. [Nelson, Kevin] Sandia Natl Labs, Livermore, CA 94550 USA. [Ulrich, G. B.; George, E. P.] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Song, B (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. EM bsong@sandia.gov; knelso@sandia.gov; rjlipin@sandia.gov; jbignel@sandia.gov; ulrichgb@ornl.gov; easo.george@rub.de NR 16 TC 0 Z9 0 U1 0 U2 0 PU E D P SCIENCES PI CEDEX A PA 17 AVE DU HOGGAR PARC D ACTIVITES COUTABOEUF BP 112, F-91944 CEDEX A, FRANCE SN 2100-014X BN 978-2-7598-1817-4 J9 EPJ WEB CONF PY 2015 VL 94 AR 01066 DI 10.1051/epjconf/20159401066 PG 4 WC Engineering, Mechanical; Materials Science, Multidisciplinary SC Engineering; Materials Science GA BE5CS UT WOS:000372587700066 ER PT S AU Vachhani, SJ Mara, N Livescu, V Cerreta, E AF Vachhani, Shraddha J. Mara, Nathan Livescu, Veronica Cerreta, Ellen BE Cadoni, E TI Microstructure and local mechanical property evolution during high strain-rate deformation of tantalum SO DYMAT 2015 - 11TH INTERNATIONAL CONFERENCE ON THE MECHANICAL AND PHYSICAL BEHAVIOUR OF MATERIALS UNDER DYNAMIC LOADING SE EPJ Web of Conferences LA English DT Proceedings Paper CT 11th International Conference on the Mechanical and Physical Behaviour of Materials under Dynamic Loading (DYMAT) CY SEP 07-11, 2015 CL Lugano, SWITZERLAND SP Univ Appl Sci & Arts So Switzerland, DynaMat Lab ID CONTINUOUS STIFFNESS MEASUREMENT; EFFECTIVE ZERO-POINT; SPHERICAL NANOINDENTATION; CRYSTAL PLASTICITY; STRESS; CURVES; EXTRACTION; METALS AB Shear localization is often a failure mechanism in materials subjected to high strain rate deformation. It is generally accepted that the microstructure evolution during deformation and the resulting heterogeneities strongly influence the development of these shear bands. Information regarding the development of local mechanical heterogeneities during deformation is difficult to characterize and as such, constitute is a critical missing piece in current crystal plasticity models. With the recent advances in spherical nanoindentation data analysis, there is now an unprecedented opportunity to obtain insights into the change in local mechanical properties during deformation in materials at sub-micron length scales. In this work, we quantify the evolution of microstructure and local mechanical properties in tantalum under dynamic loading conditions (split Hopkinson pressure bar), to capture the structure-property correlations at the sub-micron length scale. Relevant information is obtained by combining local mechanical property information captured using spherical nanoindentation with complimentary structure information at the indentation site measured using EBSD. The aim is to gain insight into the role of these microstructural features during macroscopic deformation, particularly their influence on the development of mechanical heterogeneities that lead to failure. C1 [Vachhani, Shraddha J.; Mara, Nathan; Livescu, Veronica; Cerreta, Ellen] Los Alamos Natl Lab, Mat Sci & Technol, POB 1663, Los Alamos, NM 87544 USA. [Mara, Nathan] Los Alamos Natl Lab, Ctr Integrated Nanotechnol, Los Alamos, NM 87544 USA. RP Vachhani, SJ (reprint author), Los Alamos Natl Lab, Mat Sci & Technol, POB 1663, Los Alamos, NM 87544 USA. EM Shraddha@lanl.gov RI Mara, Nathan/J-4509-2014 NR 21 TC 1 Z9 1 U1 1 U2 8 PU E D P SCIENCES PI CEDEX A PA 17 AVE DU HOGGAR PARC D ACTIVITES COUTABOEUF BP 112, F-91944 CEDEX A, FRANCE SN 2100-014X BN 978-2-7598-1817-4 J9 EPJ WEB CONF PY 2015 VL 94 AR 02023 DI 10.1051/epjconf/20159402023 PG 6 WC Engineering, Mechanical; Materials Science, Multidisciplinary SC Engineering; Materials Science GA BE5CS UT WOS:000372587700103 ER PT J AU Fisher, RE AF Fisher, Ronald E. TI Special Issue: International Perspectives on Full Spectrum Resilience SO INTERNATIONAL JOURNAL OF CRITICAL INFRASTRUCTURES LA English DT Editorial Material C1 [Fisher, Ronald E.] Idaho Natl Lab, Natl & Homeland Secur, POB 1625,MS 3770, Idaho Falls, ID 83415 USA. RP Fisher, RE (reprint author), Idaho Natl Lab, Natl & Homeland Secur, POB 1625,MS 3770, Idaho Falls, ID 83415 USA. EM ron.fisher@inl.gov NR 0 TC 0 Z9 0 U1 0 U2 0 PU INDERSCIENCE ENTERPRISES LTD PI GENEVA PA WORLD TRADE CENTER BLDG, 29 ROUTE DE PRE-BOIS, CASE POSTALE 856, CH-1215 GENEVA, SWITZERLAND SN 1475-3219 EI 1741-8038 J9 INT J CRIT INFRASTRU JI Int. J. Crit. Infrastruct. PY 2015 VL 11 IS 3 SI SI BP 195 EP 196 PG 2 WC Engineering, Multidisciplinary SC Engineering GA DH2DX UT WOS:000372595500001 ER PT J AU An, ZN Jia, HL Wu, YY Rack, PD Patchen, AD Liu, YZ Ren, Y Li, N Liaw, PK AF An, Zhinan Jia, Haoling Wu, Yueying Rack, Philip D. Patchen, Allan D. Liu, Yuzi Ren, Yang Li, Nan Liaw, Peter K. TI Solid-Solution CrCoCuFeNi High-Entropy Alloy Thin Films Synthesized by Sputter Deposition SO MATERIALS RESEARCH LETTERS LA English DT Article DE Microstructure; Sputtering; Thin films; Solid solution ID METALLIC GLASSES; STRAIN-ENERGY; GRAIN-GROWTH; MICROSTRUCTURE; BEHAVIOR; MULTICOMPONENT; ELEMENTS; SURFACE; RESISTIVITY; PROPERTY AB The concept of high configurational entropy requires that the high-entropy alloys (HEAs) yield single-phase solid solutions. However, phase separations are quite common in bulk HEAs. A five-element alloy, CrCoCuFeNi, was deposited via radio frequency magnetron sputtering and confirmed to be a single-phase solid solution through the high-energy synchrotron X-ray diffraction, energy-dispersive spectroscopy, wavelength-dispersive spectroscopy, and transmission electron microscopy. The formation of the solid-solution phase is presumed to be due to the high cooling rate of the sputter-deposition process. C1 [An, Zhinan; Jia, Haoling; Wu, Yueying; Rack, Philip D.; Li, Nan; Liaw, Peter K.] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA. [Rack, Philip D.] Oak Ridge Natl Lab, Ctr Nanophase Mat Sci, Oak Ridge, TN 37831 USA. [Patchen, Allan D.] Univ Tennessee, Dept Earth & Planetary Sci, Knoxville, TN 37996 USA. [Liu, Yuzi] Argonne Natl Lab, Ctr Nanoscale Mat, 9700 S Cass Ave, Argonne, IL 60439 USA. [Ren, Yang] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. [Li, Nan] Beijing Inst Sci & Technol, Sch Mat Sci & Engn, Beijing 100081, Peoples R China. RP Liaw, PK (reprint author), Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA. EM pliaw@utk.edu RI Liu, Yuzi/C-6849-2011 FU US National Science Foundation [DMR-0909037, CMMI-0900271, CMMI-1100080]; Department of Energy (DOE), Office of the Nuclear Energy's Nuclear Energy University Program (NEUP) [00119262]; DOE, Office of Fossil Energy, National Energy Technology Laboratory [DE-FE-0008855, DE-FE-0011194, DE-FE-0024054]; Army Research Office [W911NF-13-10438]; NSF [CBET- 1235651]; U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357] FX We very much appreciate the financial support from the US National Science Foundation (DMR-0909037, CMMI-0900271, and CMMI-1100080), the Department of Energy (DOE), Office of the Nuclear Energy's Nuclear Energy University Program (NEUP) 00119262, the DOE, Office of Fossil Energy, National Energy Technology Laboratory (DE-FE-0008855, DE-FE-0011194, and DE-FE-0024054), and the Army Research Office (W911NF-13-10438) with C. Huber, C.V. Cooper, A. Ardell, E. Taleff, V. Cedro, R. Dunst, R.O. Jensen, L. Tan, S. Lesica, J. Mullen, and D. Sterr as contract monitors. PDR acknowledges support from NSF grant No. CBET- 1235651. The use of the 33-BM and 11-ID-C at the Advanced Photon Source and Center for Nanoscale Materials at the Argonne National Lab was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. The authors also appreciate the enlightening discussion with E. A. Karapetrova. NR 42 TC 3 Z9 3 U1 7 U2 14 PU TAYLOR & FRANCIS INC PI PHILADELPHIA PA 530 WALNUT STREET, STE 850, PHILADELPHIA, PA 19106 USA SN 2166-3831 J9 MATER RES LETT JI Mater. Res. Lett. PY 2015 VL 3 IS 4 BP 203 EP 209 DI 10.1080/21663831.2015.1048904 PG 7 WC Materials Science, Multidisciplinary SC Materials Science GA DG6UA UT WOS:000372220400005 ER PT J AU Pagani, L Agnes, P Alexander, T Alton, A Arisaka, K Back, HO Baldin, B Biery, K Bonfini, G Bossa, M Brigatti, A Brodsky, J Budano, F Cadonati, L Calaprice, F Canci, N Candela, A Cao, H Cariello, M Cavalcante, P Chavarria, A Chepurnov, A Cocco, AG D'Angelo, D D'Incecco, M Davini, S De Deo, M Derbin, A Devoto, A Di Eusanio, F Di Pietro, G Edkins, E Empl, A Fan, A Fiorillo, G Fomenko, K Forster, G Franco, D Gabriele, F Galbiati, C Goretti, A Grandi, L Gromov, M Guan, MY Guardincerri, Y Hackett, B Herner, K Humble, P Hungerford, EV Ianni, A Ianni, A Jollet, C Keeter, K Kendziora, C Kidner, S Kobychev, V Koh, G Korablev, D Korga, G Kurlej, A Li, PX Lombardi, P Love, C Ludhova, L Luitz, S Ma, YQ Machulin, I Mandarano, A Mari, S Maricic, J Marini, L Martoff, CJ Meregaglia, A Meroni, E Meyers, PD Milincic, R Montanari, D Montuschi, M Monzani, ME Mosteiro, P Mount, B Muratova, V Musico, P Nelson, A Odrowski, S Okounkova, M Orsini, M Ortica, F Pallavicini, M Pantic, E Papp, L Parmeggiano, S Parsells, R Pelczar, K Pelliccia, N Perasso, S Pocar, A Pordes, S Pugachev, D Qian, H Randle, K Ranucci, G Razeto, A Reinhold, B Renshaw, A Romani, A Rossi, B Rossi, N Rountree, SD Sablone, D Saggese, P Saldanha, R Sands, W Sangiorgio, S Segreto, E Semenov, D Shields, E Skorokhvatov, M Smirnov, O Sotnikov, A Stanford, C Suvorov, Y Tartaglia, R Tatarowicz, J Testera, G Tonazzo, A Unzhakov, E Vogelaar, RB Wada, M Walker, S Wang, H Wang, Y Watson, A Westerdale, S Wojcik, M Wright, A Xiang, X Xu, J Yang, CG Yoo, J Zavatarelli, S Zec, A Zhu, C Zuzel, G AF Pagani, L. Agnes, P. Alexander, T. Alton, A. Arisaka, K. Back, H. O. Baldin, B. Biery, K. Bonfini, G. Bossa, M. Brigatti, A. Brodsky, J. Budano, F. Cadonati, L. Calaprice, F. Canci, N. Candela, A. Cao, H. Cariello, M. Cavalcante, P. Chavarria, A. Chepurnov, A. Cocco, A. G. D'Angelo, D. D'Incecco, M. Davini, S. De Deo, M. Derbin, A. Devoto, A. Di Eusanio, F. Di Pietro, G. Edkins, E. Empl, A. Fan, A. Fiorillo, G. Fomenko, K. Forster, G. Franco, D. Gabriele, F. Galbiati, C. Goretti, A. Grandi, L. Gromov, M. Guan, M. Y. Guardincerri, Y. Hackett, B. Herner, K. Humble, P. Hungerford, E. V. Ianni, Al. Ianni, An. Jollet, C. Keeter, K. Kendziora, C. Kidner, S. Kobychev, V. Koh, G. Korablev, D. Korga, G. Kurlej, A. Li, P. X. Lombardi, P. Love, C. Ludhova, L. Luitz, S. Ma, Y. Q. Machulin, I. Mandarano, A. Mari, S. Maricic, J. Marini, L. Martoff, C. J. Meregaglia, A. Meroni, E. Meyers, P. D. Milincic, R. Montanari, D. Montuschi, M. Monzani, M. E. Mosteiro, P. Mount, B. Muratova, V. Musico, P. Nelson, A. Odrowski, S. Okounkova, M. Orsini, M. Ortica, F. Pallavicini, M. Pantic, E. Papp, L. Parmeggiano, S. Parsells, R. Pelczar, K. Pelliccia, N. Perasso, S. Pocar, A. Pordes, S. Pugachev, D. Qian, H. Randle, K. Ranucci, G. Razeto, A. Reinhold, B. Renshaw, A. Romani, A. Rossi, B. Rossi, N. Rountree, S. D. Sablone, D. Saggese, P. Saldanha, R. Sands, W. Sangiorgio, S. Segreto, E. Semenov, D. Shields, E. Skorokhvatov, M. Smirnov, O. Sotnikov, A. Stanford, C. Suvorov, Y. Tartaglia, R. Tatarowicz, J. Testera, G. Tonazzo, A. Unzhakov, E. Vogelaar, R. B. Wada, M. Walker, S. Wang, H. Wang, Y. Watson, A. Westerdale, S. Wojcik, M. Wright, A. Xiang, X. Xu, J. Yang, C. G. Yoo, J. Zavatarelli, S. Zec, A. Zhu, C. Zuzel, G. CA DarkSide Collaboration TI The DarkSide veto: muon and neutron detectors SO NUOVO CIMENTO C-COLLOQUIA AND COMMUNICATIONS IN PHYSICS LA English DT Article ID DEL GRAN SASSO; LIQUID SCINTILLATOR AB The existence of dark matter is known because of its gravitational effects, and although its nature remains undisclosed, there is a growing indication that the galactic halo could be permeated by weakly interactive massive particles (WIMPs) with mass of the order of 100 GeV. Direct observation of WIMP-nuclear collisions in a laboratory detector plays a key role in dark matter searches. However, it also poses significant challenges, as the expected signals are low in energy and very rare. DarkSide is a project for direct observation of WIMPs in a liquid argon time-projection chamber specifically designed to overtake the difficulties of these challenges. A limiting background for all dark matter detectors is the production in their active volumes of nuclear recoils from the elastic scattering of radiogenic and cosmogenic neutrons. To rule out this background, DarkSide-50 is surrounded by a water tank serving as a Cherenkov detector for muons, and a boron-doped liquid scintillator acting as an active, high-efficiency neutron detector. C1 [Agnes, P.; Franco, D.; Perasso, S.; Tonazzo, A.] Univ Paris Diderot, APC, Sorbonne Paris Cite, F-75205 Paris, France. [Alton, A.] Augustana Coll, Dept Phys & Astron, Sioux Falls, SD 57197 USA. Brookhaven Natl Lab, Upton, NY 11973 USA. [Devoto, A.] Univ Cagliari, Dept Phys, I-09042 Cagliari, Italy. [Devoto, A.] INFN, I-09042 Cagliari, Italy. [Chavarria, A.; Grandi, L.; Saldanha, R.] Univ Chicago, Enrico Fermi Inst, Kavli Inst, Chicago, IL 60637 USA. [Chavarria, A.; Grandi, L.; Saldanha, R.] Univ Chicago, Dept Phys, Chicago, IL 60637 USA. [Keeter, K.; Mount, B.] Black Hills State Univ, Sch Nat Sci, Spearfish, SD 57799 USA. [Fomenko, K.; Korablev, D.; Smirnov, O.; Sotnikov, A.] Joint Inst Nucl Res, Dubna 141980, Russia. [Baldin, B.; Biery, K.; Guardincerri, Y.; Herner, K.; Kendziora, C.; Montanari, D.; Pordes, S.; Yoo, J.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. [Pagani, L.; Cariello, M.; Musico, P.; Pallavicini, M.; Testera, G.; Zavatarelli, S.] Univ Genoa, Dept Phys, I-16146 Genoa, Italy. [Pagani, L.; Cariello, M.; Musico, P.; Pallavicini, M.; Testera, G.; Zavatarelli, S.] INFN, I-16146 Genoa, Italy. [Bossa, M.] Gran Sasso Sci Inst, I-67100 Laquila, Italy. [Edkins, E.; Hackett, B.; Maricic, J.; Milincic, R.; Reinhold, B.] Univ Hawaii, Dept Phys & Astron, Honolulu, HI 96822 USA. [Davini, S.; Empl, A.; Hungerford, E. V.; Korga, G.; Sablone, D.] Univ Houston, Dept Phys, Houston, TX 77204 USA. [Guan, M. Y.; Li, P. X.; Ma, Y. Q.; Wang, Y.; Yang, C. G.] Inst High Energy Phys, Beijing 100049, Peoples R China. [Pelczar, K.; Wojcik, M.; Zuzel, G.] Jagiellonian Univ, Smoluchowski Inst Phys, PL-30059 Krakow, Poland. [Kobychev, V.] Natl Acad Sci Ukraine, Inst Nucl Res, UA-03680 Kiev, Ukraine. [Machulin, I.; Pugachev, D.; Skorokhvatov, M.] Natl Res Ctr Kurchatov Inst, Moscow 123182, Russia. [Sangiorgio, S.] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. [Bonfini, G.; Candela, A.; Cavalcante, P.; D'Incecco, M.; De Deo, M.; Gabriele, F.; Ianni, Al.; Montuschi, M.; Odrowski, S.; Orsini, M.; Razeto, A.; Rossi, N.; Saggese, P.; Segreto, E.; Tartaglia, R.] Lab Nazl Gran Sasso, I-67010 Assergi, AQ, Italy. [Machulin, I.; Skorokhvatov, M.] Natl Res Nucl Univ, Moscow Engn Phys Inst, Moscow 115409, Russia. [Brigatti, A.; D'Angelo, D.; Di Pietro, G.; Lombardi, P.; Ludhova, L.; Meroni, E.; Parmeggiano, S.; Ranucci, G.] Univ Milan, Dept Phys, I-20133 Milan, Italy. [Brigatti, A.; D'Angelo, D.; Di Pietro, G.; Lombardi, P.; Ludhova, L.; Meroni, E.; Parmeggiano, S.; Ranucci, G.] INFN, I-20133 Milan, Italy. [Chepurnov, A.; Gromov, M.] Lomonosov Moscow State Univ, Skobeltsyn Inst Nucl Phys, Moscow 119991, Russia. [Cocco, A. G.; Fiorillo, G.; Rossi, B.; Walker, S.] Univ Naples Federico II, Dept Phys, I-80126 Naples, Italy. [Cocco, A. G.; Fiorillo, G.; Rossi, B.; Walker, S.] INFN, I-80126 Naples, Italy. [Humble, P.] Pacific NW Natl Lab, Richland, WA 99352 USA. [Derbin, A.; Muratova, V.; Semenov, D.; Unzhakov, E.] St Petersburg Nucl Phys Inst, Gatchina 188350, Russia. [Ortica, F.; Pelliccia, N.; Romani, A.] Univ Perugia, Chem Biol & Biotechnol Dept, I-06123 Perugia, Italy. [Ortica, F.; Pelliccia, N.; Romani, A.] INFN, I-06123 Perugia, Italy. Princeton Univ, Dept Chem Engn, Princeton, NJ 08544 USA. [Back, H. O.; Brodsky, J.; Calaprice, F.; Cao, H.; Di Eusanio, F.; Galbiati, C.; Goretti, A.; Ianni, An.; Koh, G.; Meyers, P. D.; Mosteiro, P.; Nelson, A.; Okounkova, M.; Parsells, R.; Qian, H.; Rossi, B.; Sands, W.; Shields, E.; Stanford, C.; Wada, M.; Westerdale, S.; Wright, A.; Xiang, X.; Xu, J.; Zhu, C.] Princeton Univ, Dept Phys, Princeton, NJ 08544 USA. [Budano, F.; Mandarano, A.; Mari, S.; Marini, L.] Univ Rome Tre, Dept Phys, I-00146 Rome, Italy. [Budano, F.; Mandarano, A.; Mari, S.; Marini, L.] INFN, I-00146 Rome, Italy. [Luitz, S.; Monzani, M. E.] SLAC Natl Accelerator Lab, Menlo Pk, CA 94025 USA. [Jollet, C.; Meregaglia, A.] Univ Strasbourg, CNRS, IPHC, IN2P3, F-67037 Strasbourg, France. [Love, C.; Martoff, C. J.; Tatarowicz, J.; Watson, A.] Temple Univ, Dept Phys, Philadelphia, PA 19122 USA. [Pantic, E.] Univ Calif Davis, Dept Phys, Davis, CA 95616 USA. [Arisaka, K.; Canci, N.; Fan, A.; Pantic, E.; Renshaw, A.; Suvorov, Y.; Wang, H.] Calif State Univ Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA. [Alexander, T.; Cadonati, L.; Forster, G.; Kurlej, A.; Pocar, A.; Randle, K.; Zec, A.] Univ Massachusetts, Dept Phys, Amherst, MA 01003 USA. [Kidner, S.; Papp, L.; Rountree, S. D.; Vogelaar, R. B.] Virginia Tech, Dept Phys, Blacksburg, VA 24061 USA. RP Pagani, L (reprint author), Univ Genoa, Dept Phys, I-16146 Genoa, Italy.; Pagani, L (reprint author), INFN, I-16146 Genoa, Italy. RI Romani, Aldo/G-8103-2012; Ortica, Fausto/C-1001-2013; Yoo, Jonghee/K-8394-2016; Fiorillo, Giuliana/A-2248-2012; Machulin, Igor/R-9711-2016; Skorokhvatov, Mikhail/R-9735-2016; OI Romani, Aldo/0000-0002-7338-0097; Ortica, Fausto/0000-0001-8276-452X; Fiorillo, Giuliana/0000-0002-6916-6776; Wang, Yi/0000-0002-7351-6978 NR 13 TC 0 Z9 0 U1 3 U2 5 PU SOC ITALIANA FISICA PI BOLOGNA PA VIA SARAGOZZA, 12, I-40123 BOLOGNA, ITALY SN 2037-4909 EI 1826-9885 J9 NUOVO CIM C-COLLOQ C JI Nuovo Cim. C-Colloq. Commun. Phys. PD JAN-FEB PY 2015 VL 38 IS 1 AR 35 DI 10.1393/ncc/i2015-15035-0 PG 5 WC Physics, Multidisciplinary SC Physics GA DH4AD UT WOS:000372727000035 ER PT J AU Bridges, RA Collins, JP Ferragut, EM Laska, JA Sullivan, BD AF Bridges, Robert A. Collins, John P. Ferragut, Erik M. Laska, Jason A. Sullivan, Blair D. BE Pei, J Silvestri, F Tang, J TI Multi-Level Anomaly Detection on Time-Varying Graph Data SO PROCEEDINGS OF THE 2015 IEEE/ACM INTERNATIONAL CONFERENCE ON ADVANCES IN SOCIAL NETWORKS ANALYSIS AND MINING (ASONAM 2015) LA English DT Proceedings Paper CT IEEE/ACM International Conference on Advances in Social Networks Analysis and Mining (ASONAM) CY AUG 25-28, 2015 CL Paris, FRANCE SP IEEE, Assoc Comp Machinery, ACM SIGKDD, IEEE Comp Soc, IEEE TCDE, Springer, Cisco, Telecom ParisTech AB This work presents a novel modeling and analysis framework for graph sequences which addresses the challenge of detecting and contextualizing anomalies in labeled, streaming graph data. We introduce a generalization of the BTER model of Seshadhri et al. by adding flexibility to community structure, and use this model to perform multi-scale graph anomaly detection. Specifically, probability models describing coarse subgraphs are built by aggregating node probabilities, and these related hierarchical models simultaneously detect deviations from expectation. This technique provides insight into the graphs' structure and helps contextualized detected event. For evaluation, two new hierarchical detectors are tested against a baseline Gaussian method on a synthetic graph sequence with seeded anomalies. We demonstrate that in a labeled setting with community structure, our graph statistics-based approach outperforms both a distribution-based detector and the baseline, accurately detecting anomalies at the node, subgraph, and graph levels. C1 [Bridges, Robert A.; Collins, John P.; Ferragut, Erik M.; Laska, Jason A.] Oak Ridge Natl Lab, Computat Sci & Engn Div, Oak Ridge, TN 37831 USA. [Sullivan, Blair D.] N Carolina State Univ, Dept Comp Sci, Raleigh, NC 27695 USA. RP Bridges, RA (reprint author), Oak Ridge Natl Lab, Computat Sci & Engn Div, Oak Ridge, TN 37831 USA. EM bridgesra@ornl.gov; jparcoll@gmail.com; ferragutem@ornl.gov; laskaja@ornl.gov; blair_sullivan@ncsu.edu NR 13 TC 1 Z9 1 U1 0 U2 2 PU ASSOC COMPUTING MACHINERY PI NEW YORK PA 1515 BROADWAY, NEW YORK, NY 10036-9998 USA BN 978-1-4503-3854-7 PY 2015 BP 579 EP 583 DI 10.1145/2808797.2809406 PG 5 WC Computer Science, Artificial Intelligence; Computer Science, Information Systems SC Computer Science GA BE4JN UT WOS:000371793500084 ER PT S AU Bosisio, AV Cadeddu, MP AF Bosisio, Ada Vittoria Cadeddu, Maria P. GP IEEE TI RAIN DETECTION FROM GROUND-BASED RADIOMETRIC MEASUREMENTS: VALIDATION AGAINST RAIN SENSOR OBSERVATIONS SO 2015 IEEE INTERNATIONAL GEOSCIENCE AND REMOTE SENSING SYMPOSIUM (IGARSS) SE IEEE International Symposium on Geoscience and Remote Sensing IGARSS LA English DT Proceedings Paper CT IEEE International Geoscience and Remote Sensing Symposium (IGARSS) CY JUL 26-31, 2015 CL Milan, ITALY SP IEEE DE microwave radiometry; atmospheric remote sensing; rainfall detection AB The identification of rain contaminated ground-based radiometric measurements is addressed by means of two brightness temperature-based criteria, namely SSI, defined as the ratio of temperature at 30 and 23.8 GHz, and TB30 based on the 30-GHz temperature value alone. Threshold values of these criteria were chosen according to the rate of misclassification set by the experimenter after classification of a training subset of data on the basis of the atmospheric conditions as observed by a variety of rain sensors. A comparison of the discrimination performances indicates that SSI detects light rain events that are missed by both the rain-gauge and TB30 but it suffers from the intrinsic response time of the brightness temperature in the presence of rain. The analysis is referred to 1 year of measurements collected at the ARM SGP facility in Oklahoma. C1 [Bosisio, Ada Vittoria] Politecn Milan, CNR IEIIT, Pzza Leonardo da Vinci 32, I-20133 Milan, Italy. [Cadeddu, Maria P.] Argonne Natl Lab, Argonne, IL 60439 USA. RP Bosisio, AV (reprint author), Politecn Milan, CNR IEIIT, Pzza Leonardo da Vinci 32, I-20133 Milan, Italy. NR 7 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2153-6996 BN 978-1-4799-7929-5 J9 INT GEOSCI REMOTE SE PY 2015 BP 2323 EP 2326 PG 4 WC Engineering, Electrical & Electronic; Geosciences, Multidisciplinary; Remote Sensing SC Engineering; Geology; Remote Sensing GA BE4GM UT WOS:000371696702105 ER PT S AU Skurikhin, AN AF Skurikhin, Alexei N. GP IEEE TI HIDDEN CONDITIONAL RANDOM FIELDS FOR LAND-USE CLASSIFICATION SO 2015 IEEE INTERNATIONAL GEOSCIENCE AND REMOTE SENSING SYMPOSIUM (IGARSS) SE IEEE International Symposium on Geoscience and Remote Sensing IGARSS LA English DT Proceedings Paper CT IEEE International Geoscience and Remote Sensing Symposium (IGARSS) CY JUL 26-31, 2015 CL Milan, ITALY SP IEEE DE Conditional random fields; classification; remote sensing; land-use AB Undirected probabilistic graphical models such as Markov Random Fields (MRFs) and Conditional Random Fields (CRFs) are being increasingly used to model problems having a structured domain and to enable probabilistic inferences such as answering queries about the variables of interest, e.g., inferring classification labels of pixel patches or images. We investigate Multiple-Instance learning approach based on Hidden Conditional Random Fields for land-use classification using weakly labeled aerial images. The performance is evaluated using publicly available dataset that contains aerial imagery belonging to 21 land-use categories. C1 [Skurikhin, Alexei N.] Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. RP Skurikhin, AN (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. EM alexei@lanl.gov NR 16 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2153-6996 BN 978-1-4799-7929-5 J9 INT GEOSCI REMOTE SE PY 2015 BP 4376 EP 4379 PG 4 WC Engineering, Electrical & Electronic; Geosciences, Multidisciplinary; Remote Sensing SC Engineering; Geology; Remote Sensing GA BE4GM UT WOS:000371696704115 ER PT S AU King, MP Dickerson, JR DasGupta, S Marinella, MJ Kaplar, RJ Piedra, D Sun, M Palacios, T AF King, M. P. Dickerson, J. R. DasGupta, S. Marinella, M. J. Kaplar, R. J. Piedra, D. Sun, M. Palacios, T. GP IEEE TI Trapping Characteristics and Parametric Shifts in Lateral GaN HEMTs with SiO2/AlGaN Gate Stacks SO 2015 IEEE INTERNATIONAL RELIABILITY PHYSICS SYMPOSIUM (IRPS) SE International Reliability Physics Symposium LA English DT Proceedings Paper CT IEEE International Reliability Physics Symposium (IRPS) CY APR 19-23, 2015 CL Monterey, CA SP IEEE DE gallium nitride; HEMT; current collapse; defects; trapped charge; power electronics; reliability ID BOUND-CONSTRAINED OPTIMIZATION; ALGORITHM AB Recovery transients following blocking-state voltage stress are analyzed for two types of AlGaN/GaN HEMTs, one set of devices with thick AlGaN barrier layers and another with recessed-gate geometry and ALD SiO2 gate dielectric. Results show temperature-invariant emission processes are present in both devices. Recessed-gate devices with SiO2 dielectrics are observed to exhibit simultaneous trapping and emission processes during poststress recovery. C1 [King, M. P.; Dickerson, J. R.; DasGupta, S.; Marinella, M. J.; Kaplar, R. J.] Sandia Natl Labs, Albuquerque, NM 87111 USA. [Piedra, D.; Sun, M.; Palacios, T.] MIT, Cambridge, MA 02139 USA. RP King, MP (reprint author), Sandia Natl Labs, Albuquerque, NM 87111 USA. EM mpking@sandia.gov NR 19 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1541-7026 BN 978-1-4673-7362-3 J9 INT RELIAB PHY SYM PY 2015 PG 8 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA BE4LL UT WOS:000371888900022 ER PT S AU Degrave, J Caluwaerts, K Dambre, J Wyffels, F AF Degrave, Jonas Caluwaerts, Ken Dambre, Joni Wyffels, Francis GP IEEE TI Developing an Embodied Gait on a Compliant Quadrupedal Robot SO 2015 IEEE/RSJ INTERNATIONAL CONFERENCE ON INTELLIGENT ROBOTS AND SYSTEMS (IROS) SE IEEE International Conference on Intelligent Robots and Systems LA English DT Proceedings Paper CT IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS) CY SEP 28-OCT 02, 2015 CL Hamburg, GERMANY SP IEEE, RSJ, Univ Hamburg, DFG, RA, New Technol Fdn, SICE, KUKA, DJI, Rethink Robot, BOSCH, Chinese Acad Sci, SIAT, Boozhong, Adept, Automatica, HIT, Ascending Technol, OPTOFORCE, DST Robot, BA Syst, Rainbow Robot, SIA, CLEARPATH Robot, Swiss Natl Ctr Competence Res Robot, SINEVA, Dyson, SICK, Robocept, Force Dimension, Open Unit Robot, Luoyang Natl Univ Sci Park, Fuzhou Univ, Synapticon, Google, Technishce Univ Munchen, iRobot, Echord++, Khalifa Univ, Pan Robot, FESTO, Kinova Robot, SCHUNK, ies ID LOCOMOTION; FRAMEWORK AB Incorporating the body dynamics of compliant robots into their controller architectures can drastically reduce the complexity of locomotion control. An extreme version of this embodied control principle was demonstrated in highly compliant tensegrity robots, for which stable gait generation was achieved by using only optimized linear feedback from the robot's sensors to its actuators. The morphology of quadrupedal robots has previously been used for sensing and for control of a compliant spine, but never for gait generation. In this paper, we successfully apply embodied control to the compliant, quadrupedal Oncilla robot. As initial experiments indicated that mere linear feedback does not suffice, we explore the minimal requirements for robust gait generation in terms of memory and nonlinear complexity. Our results show that a memoryless feedback controller can generate a stable trot by learning the desired nonlinear relation between the input and the output signals. We believe this method can provide a very useful tool for transferring knowledge from open loop to closed loop control on compliant robots. C1 [Degrave, Jonas; Dambre, Joni; Wyffels, Francis] Univ Ghent, Elect & Informat Syst ELIS, Sint Pietersnieuwstr 41, B-9000 Ghent, Belgium. [Caluwaerts, Ken] NASA, Ames Res Ctr, Oak Ridge Associated Univ, Mail Stop 269-3, Moffett Field, CA 94035 USA. RP Degrave, J (reprint author), Univ Ghent, Elect & Informat Syst ELIS, Sint Pietersnieuwstr 41, B-9000 Ghent, Belgium. EM Jonas.Degrave@UGent.be NR 24 TC 3 Z9 3 U1 1 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2153-0858 BN 978-1-4799-9994-1 J9 IEEE INT C INT ROBOT PY 2015 BP 4486 EP 4491 PG 6 WC Computer Science, Artificial Intelligence; Robotics SC Computer Science; Robotics GA BE4LI UT WOS:000371885404100 ER PT S AU Mirletz, BT Park, IW Quinn, RD SunSpiral, V AF Mirletz, Brian T. Park, In-Won Quinn, Roger D. SunSpiral, Vytas GP IEEE TI Towards bridging the reality gap between tensegrity simulation and robotic hardware SO 2015 IEEE/RSJ INTERNATIONAL CONFERENCE ON INTELLIGENT ROBOTS AND SYSTEMS (IROS) SE IEEE International Conference on Intelligent Robots and Systems LA English DT Proceedings Paper CT IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS) CY SEP 28-OCT 02, 2015 CL Hamburg, GERMANY SP IEEE, RSJ, Univ Hamburg, DFG, RA, New Technol Fdn, SICE, KUKA, DJI, Rethink Robot, BOSCH, Chinese Acad Sci, SIAT, Boozhong, Adept, Automatica, HIT, Ascending Technol, OPTOFORCE, DST Robot, BA Syst, Rainbow Robot, SIA, CLEARPATH Robot, Swiss Natl Ctr Competence Res Robot, SINEVA, Dyson, SICK, Robocept, Force Dimension, Open Unit Robot, Luoyang Natl Univ Sci Park, Fuzhou Univ, Synapticon, Google, Technishce Univ Munchen, iRobot, Echord++, Khalifa Univ, Pan Robot, FESTO, Kinova Robot, SCHUNK, ies ID MODEL AB Using a new hardware implementation of our designs for tunably compliant spine-like tensegrity robots, we show that the NASA Tensegrity Robotics Toolkit can effectively generate and predict desirable locomotion strategies for these many degree of freedom systems. Tensegrity, which provides structural integrity through a tension network, shows promise as a design strategy for more compliant robots capable of interaction with rugged environments, such as a tensegrity interplanetary probe prototype surviving multi-story drops. Due to the complexity of tensegrity structures, modeling through physics simulation and machine learning improves our ability to design and evaluate new structures and their controllers in a dynamic environment. The kinematics of our simulator, the open source NASA Tensegrity Robotics Toolkit, have been previously validated within 1.3% error on position through motion capture of the six strut robot ReCTeR. This paper provides additional validation of the dynamics through the direct comparison of the simulator to forces experienced by the latest version of the Tetraspine robot. These results give us confidence in our strategy of using tensegrity to impart future robotic systems with properties similar to biological systems such as increased flexibility, power, and mobility in extreme terrains. C1 [Mirletz, Brian T.; Quinn, Roger D.] Case Western Reserve Univ, Dept Mech & Aerosp Engn, Biologically Inspired Robot Lab, Cleveland, OH 44016 USA. [Park, In-Won] Oak Ridge Associated Univ, Oak Ridge, TN 37831 USA. [SunSpiral, Vytas] SGT Inc, Greenbelt, MD USA. RP Mirletz, BT (reprint author), Case Western Reserve Univ, Dept Mech & Aerosp Engn, Biologically Inspired Robot Lab, Cleveland, OH 44016 USA. EM bmirletz@case.edu; rdq@case.edu; vytas.sunspiral@nasa.gov NR 38 TC 1 Z9 1 U1 2 U2 3 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2153-0858 BN 978-1-4799-9994-1 J9 IEEE INT C INT ROBOT PY 2015 BP 5357 EP 5363 PG 7 WC Computer Science, Artificial Intelligence; Robotics SC Computer Science; Robotics GA BE4LI UT WOS:000371885405070 ER PT S AU Carrera, D Boracchi, G Poi, A Wohlberg, B AF Carrera, Diego Boracchi, Giacomo Poi, Alessandro Wohlberg, Brendt GP IEEE TI Detecting Anomalous Structures by Convolutional Sparse Models SO 2015 INTERNATIONAL JOINT CONFERENCE ON NEURAL NETWORKS (IJCNN) SE IEEE International Joint Conference on Neural Networks (IJCNN) LA English DT Proceedings Paper CT International Joint Conference on Neural Networks (IJCNN) CY JUL 12-17, 2015 CL Killarney, IRELAND DE Anomaly Detection; Convolutional Sparse Models; Deconvolutional Networks ID NOVELTY DETECTION AB We address the problem of detecting anomalies in images, specifically that of detecting regions characterized by structures that do not conform those of normal images. In the proposed approach we exploit convolutional sparse models to learn a dictionary of filters from a training set of normal images. These filters capture the structure of normal images and are leveraged to quantitatively assess whether regions of a test image are normal or anomalous. Each test image is at first encoded with respect to the learned dictionary, yielding sparse coefficient maps, and then analyzed by computing indicator vectors that assess the conformance of local image regions with the learned filters. Anomalies are then detected by identifying outliers in these indicators. Our experiments demonstrate that a convolutional sparse model provides better anomaly-detection performance than an equivalent method based on standard patch-based sparsity. Most importantly, our results highlight that monitoring the local group sparsity, namely the spread of nonzero coefficients C1 [Carrera, Diego; Boracchi, Giacomo] Politecn Milan, Dipartimento Elettron Informaz & Bioingegeria, Milan, Italy. [Poi, Alessandro] Tampere Univ Technol, Dept Signal Proc, FIN-33101 Tampere, Finland. [Wohlberg, Brendt] Los Alamos Natl Lab, Div Theoret, Los Alamos, NM USA. RP Carrera, D (reprint author), Politecn Milan, Dipartimento Elettron Informaz & Bioingegeria, Milan, Italy. EM diego.carrera@polimi.it; giacomo.boracchi@polimi.it; alessandro.foi@tut.fi; brendt@lanl.gov NR 23 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2161-4393 BN 978-1-4799-1959-8 J9 IEEE IJCNN PY 2015 PG 8 WC Computer Science, Artificial Intelligence; Computer Science, Hardware & Architecture; Engineering, Electrical & Electronic SC Computer Science; Engineering GA BE3HR UT WOS:000370730603088 ER PT S AU Rothganger, F Evans, BR Aimone, JB DeBenedictis, EP AF Rothganger, Fred Evans, Brian R. Aimone, James B. DeBenedictis, Erik P. GP IEEE TI Training neural hardware with noisy components SO 2015 INTERNATIONAL JOINT CONFERENCE ON NEURAL NETWORKS (IJCNN) SE IEEE International Joint Conference on Neural Networks (IJCNN) LA English DT Proceedings Paper CT International Joint Conference on Neural Networks (IJCNN) CY JUL 12-17, 2015 CL Killarney, IRELAND AB Some next generation computing devices may consist of resistive memory arranged as a crossbar. Currently, the dominant approach is to use crossbars as the weight matrix of a neural network, and to use learning algorithms that require small incremental weight updates, such as gradient descent (for example Backpropagation). Using real-world measurements, we demonstrate that resistive memory devices are unlikely to support such learning methods. As an alternative, we offer a random search algorithm tailored to the measured characteristics of our devices. C1 [Rothganger, Fred; Evans, Brian R.; Aimone, James B.; DeBenedictis, Erik P.] Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. RP Rothganger, F (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. RI Aimone, James/H-4694-2016 OI Aimone, James/0000-0002-7361-253X NR 16 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2161-4393 BN 978-1-4799-1959-8 J9 IEEE IJCNN PY 2015 PG 8 WC Computer Science, Artificial Intelligence; Computer Science, Hardware & Architecture; Engineering, Electrical & Electronic SC Computer Science; Engineering GA BE3HR UT WOS:000370730603070 ER PT S AU Vineyard, CM Verzi, SJ James, CD Aimone, JB Heileman, GL AF Vineyard, Craig M. Verzi, Stephen J. James, Conrad D. Aimone, James B. Heileman, Gregory L. GP IEEE TI Repeated Play of the SVM Game as a Means of Adaptive Classification SO 2015 INTERNATIONAL JOINT CONFERENCE ON NEURAL NETWORKS (IJCNN) SE IEEE International Joint Conference on Neural Networks (IJCNN) LA English DT Proceedings Paper CT International Joint Conference on Neural Networks (IJCNN) CY JUL 12-17, 2015 CL Killarney, IRELAND AB The field of machine learning strives to develop algorithms that, through learning, lead to generalization; that is, the ability of a machine to perform a task that it was not explicitly trained for. An added challenge arises when the problem domain is dynamic or non-stationary with the data distributions or categorizations changing over time. This phenomenon is known as concept drift. Game-theoretic algorithms are often iterative by nature, consisting of repeated game play rather than a single interaction. Effectively, rather than requiring extensive retraining to update a learning model, a game-theoretic approach can adjust strategies as a novel approach to concept drift. In this paper we present a variant of our Support Vector Machine (SVM) Game classifier which may be used in an adaptive manner with repeated play to address concept drift, and show results of applying this algorithm to synthetic as well as real data. C1 [Vineyard, Craig M.; Verzi, Stephen J.; James, Conrad D.; Aimone, James B.] Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. [Heileman, Gregory L.] Univ New Mexico, Elect & Comp Engn Dept, Albuquerque, NM 87131 USA. RP Vineyard, CM (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. EM cmviney@sandia.gov RI Aimone, James/H-4694-2016 OI Aimone, James/0000-0002-7361-253X NR 24 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2161-4393 BN 978-1-4799-1959-8 J9 IEEE IJCNN PY 2015 PG 8 WC Computer Science, Artificial Intelligence; Computer Science, Hardware & Architecture; Engineering, Electrical & Electronic SC Computer Science; Engineering GA BE3HR UT WOS:000370730603027 ER PT S AU Choe, YK Henson, NJ Kim, YS AF Choe, Yoong-Kee Henson, Neil J. Kim, Yu Seung BE Simos, TE Kalogiratou, Z Monovasilis, T TI Chemical Degradation Mechanisms of Membranes for Alkaline Membrane Fuel Cells SO INTERNATIONAL CONFERENCE OF COMPUTATIONAL METHODS IN SCIENCES AND ENGINEERING 2015 (ICCMSE 2015) SE AIP Conference Proceedings LA English DT Proceedings Paper CT International Conference of Computational Methods in Sciences and Engineering (ICCMSE) CY MAR 20-23, 2015 CL Athens, GREECE DE DFT calculations; Anion exchange membrane; alkaline membrane fuel cell ID POLYAROMATICS; STABILITY AB Chemical degradation mechanisms of membranes for alkaline membrane fuel cells have been investigated using density functional theory (DFT). We have elucidated that the aryl-ether moiety of membranes is one of the weakest site against attack of hydroxide ions. The results of DFT calculations for hydroxide initiated aryl-ether cleavage indicated that the arylether cleavage occurred prior to degradation of cationic functional group. Such a weak nature of the aryl-ether group arises from the electron deficiency of the aryl group as well as the low bond dissociation energy. The DFT results suggests that removal of the aryl-ether group in the membrane should enhance the stability of membranes under alkaline conditions. In fact, an ether fee poly(phenylene) membrane exhibits excellent stability against the attack from hydroxide ions. C1 [Choe, Yoong-Kee] Natl Inst Adv Ind Sci & Technol, Umezono 1-1-1, Tsukuba, Ibaraki, Japan. [Henson, Neil J.; Kim, Yu Seung] Los Alamos Natl Lab, Los Alamos, NM USA. RP Choe, YK (reprint author), Natl Inst Adv Ind Sci & Technol, Umezono 1-1-1, Tsukuba, Ibaraki, Japan. EM yoongkee-choe@aist.go.jp RI Choe, Yoong-Kee/A-9635-2008; OI Henson, Neil/0000-0002-1842-7884 NR 15 TC 0 Z9 0 U1 0 U2 4 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0094-243X BN 978-0-7354-1349-8 J9 AIP CONF PROC PY 2015 VL 1702 AR 090010 DI 10.1063/1.4938818 PG 3 WC Physics, Applied SC Physics GA BE4JR UT WOS:000371804300048 ER PT J AU Yu, KY Fan, Z Chen, Y Song, M Liu, Y Wang, H Kirk, MA Li, M Zhang, X AF Yu, K. Y. Fan, Z. Chen, Y. Song, M. Liu, Y. Wang, H. Kirk, M. A. Li, M. Zhang, X. TI In situ Observation of Defect Annihilation in Kr Ion-Irradiated Bulk Fe/Amorphous-Fe2Zr Nanocomposite Alloy SO MATERIALS RESEARCH LETTERS LA English DT Article DE Defect Cluster; Heavy Ion Irradiation; Absorption; Annihilation ID HE ION; NANOLAYERED COMPOSITES; MECHANICAL-PROPERTIES; RADIATION-DAMAGE; MULTILAYERS; TOLERANCE; REDUCTION; PHASES; ENERGY AB Enhanced irradiation tolerance in crystalline multilayers has received significant attention lately. However, little is known on the irradiation response of crystal/amorphous nanolayers. We report on in situ Kr ion irradiation studies of a bulk Fe96Zr4 nanocomposite alloy. Irradiation resulted in amorphization of Fe2Zr and formed crystal/amorphous nanolayers. alpha-Fe layers exhibited drastically lower defect density and size than those in large alpha-Fe grains. In situ video revealed that mobile dislocation loops in alpha-Fe layers were confined by the crystal/amorphous interfaces and kept migrating to annihilate other defects. This study provides new insights on the design of irradiation-tolerant crystal/amorphous nanocomposites. C1 [Yu, K. Y.] China Univ Petr, Dept Mat Sci & Engn, Beijing 102249, Peoples R China. [Yu, K. Y.; Chen, Y.; Song, M.; Liu, Y.; Zhang, X.] Texas A&M Univ, Dept Mat Sci & Engn, College Stn, TX 77843 USA. [Fan, Z.; Zhang, X.] Texas A&M Univ, Dept Mech Engn, College Stn, TX 77843 USA. [Wang, H.] Texas A&M Univ, Dept Elect & Comp Engn, College Stn, TX 77843 USA. [Kirk, M. A.] Argonne Natl Lab, Mat Sci Div, Argonne, IL 60439 USA. [Li, M.] Argonne Natl Lab, Nucl Engn Div, Argonne, IL 60439 USA. RP Yu, KY (reprint author), China Univ Petr, Dept Mat Sci & Engn, Beijing 102249, Peoples R China. EM kyyu@cup.edu.cn; zhangx@tamu.edu RI Chen, Youxing/P-5006-2016; Liu, Yue/H-4071-2014 OI Chen, Youxing/0000-0003-1111-4495; Liu, Yue/0000-0001-8518-5734 FU NSF-DMR-Metallic Materials and Nanostructures Program [1304101]; NSF-CMMI [1161978]; Science Foundation of China University of Petroleum, Beijing [2462014 YJRC019]; College of Engineering, Texas AM University; DOE-BES FX We acknowledge financial support by NSF-DMR-Metallic Materials and Nanostructures Program under grant no. 1304101. ZF and YL are supported financially by NSF-CMMI 1161978. K. Y. Yu acknowledges financial support by Science Foundation of China University of Petroleum, Beijing (no. 2462014 YJRC019). XZ and HW also acknowledge Strategic research fund for new research initiatives provided by College of Engineering, Texas A&M University. We also thank Peter M. Baldo and Edward A. Ryan at Argonne National Laboratory for their help during in situ irradiation experiments. The IVEM facility at Argonne National Laboratory is supported by DOE-BES. Access to the DOE-Center for Integrated Nanotechnologies (CINT) at Los Alamos and Sandia National Laboratories and Microscopy and Imaging Center at Texas A&M University is also acknowledged. NR 38 TC 1 Z9 1 U1 2 U2 3 PU TAYLOR & FRANCIS INC PI PHILADELPHIA PA 530 WALNUT STREET, STE 850, PHILADELPHIA, PA 19106 USA SN 2166-3831 J9 MATER RES LETT JI Mater. Res. Lett. PY 2015 VL 3 IS 1 BP 35 EP 42 DI 10.1080/21663831.2014.951494 PG 8 WC Materials Science, Multidisciplinary SC Materials Science GA DG6SD UT WOS:000372215500006 ER PT J AU Carpenter, JS Nizolek, TJ McCabe, RJ Zheng, SJ Scott, JE Vogel, SC Mara, NA Pollock, TM Beyerlein, IJ AF Carpenter, J. S. Nizolek, T. J. McCabe, R. J. Zheng, S. J. Scott, J. E. Vogel, S. C. Mara, N. A. Pollock, T. M. Beyerlein, I. J. TI The Suppression of Instabilities via Biphase Interfaces During Bulk Fabrication of Nanograined Zr SO MATERIALS RESEARCH LETTERS LA English DT Article DE Severe Plastic Deformation; Zirconium; Nanomaterials; Interfaces ID SEVERE PLASTIC-DEFORMATION; NB NANOLAMELLAR COMPOSITES; CHANNEL ANGULAR EXTRUSION; HIGH-PRESSURE TORSION; BONDING ARB PROCESS; TEXTURE EVOLUTION; MECHANICAL-PROPERTIES; HIGH-STRENGTH; CU-AG; NANOCRYSTALLINE MATERIALS AB Severe plastic deformation (SPD) is a common method to fabricate nano-grained metals. However for Zr, a structural metal for nuclear applications, obtaining a nanoscale grain structure via SPD has been problematic due to deformation twinning and phase transformations. Here, nanostructured hcp Zr is fabricated through a refinement process via the introduction of a biphase interface. Despite mechanical and thermal conditions known to chemically mix Zr and Nb, no intermixing is observed and the heterophase interfaces appear resistant to phase transformations and twinning. Increasing the density of chemically sharp Zr-Nb interfaces is a very different refinement mechanism than substructure development, stacking fault formation, or alloying. C1 [Carpenter, J. S.; McCabe, R. J.; Scott, J. E.; Mara, N. A.] Los Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USA. [Nizolek, T. J.; Pollock, T. M.] Univ Calif Santa Barbara, Dept Mat, Santa Barbara, CA 93106 USA. [Zheng, S. J.; Mara, N. A.] Los Alamos Natl Lab, Mat Phys & Applicat Div, Los Alamos, NM 87545 USA. [Vogel, S. C.] Los Alamos Natl Lab, Los Alamos Neutron Sci Ctr, Los Alamos, NM 87545 USA. [Beyerlein, I. J.] Los Alamos Natl Lab, Theoret Div, Los Alamos, NM 87545 USA. RP Carpenter, JS (reprint author), Los Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USA. EM carpenter@lanl.gov OI McCabe, Rodney /0000-0002-6684-7410; Vogel, Sven C./0000-0003-2049-0361; Carpenter, John/0000-0001-8821-043X FU Los Alamos National Laboratory Directed Research and Development (LDRD) [20140348ER]; UC Lab Fees Research Program [UCD-12-0045.15]; Department of Defense (DoD) through the National Defense Science & Engineering Graduate Fellowship (NDSEG) Program; DOE [DEAC52-06NA25396] FX JSC and RJM were supported by the Los Alamos National Laboratory Directed Research and Development (LDRD) project 20140348ER. TMP, IJB and NAM wish to acknowledge support by the UC Lab Fees Research Program # UCD-12-0045.15. TN was supported by the Department of Defense (DoD) through the National Defense Science & Engineering Graduate Fellowship (NDSEG) Program. Los Alamos National Laboratory is operated by Los Alamos National Security LLC under DOE Contract DEAC52-06NA25396. NeD results were collected on the High Pressure Preferred Orientation (HIPPO) beam line at the Los Alamos Neutron Science Center. Electron microscopy was performed at the Los Alamos Electron Microscopy Laboratory. NR 74 TC 2 Z9 2 U1 1 U2 3 PU TAYLOR & FRANCIS INC PI PHILADELPHIA PA 530 WALNUT STREET, STE 850, PHILADELPHIA, PA 19106 USA SN 2166-3831 J9 MATER RES LETT JI Mater. Res. Lett. PY 2015 VL 3 IS 1 BP 50 EP 57 DI 10.1080/21663831.2014.941954 PG 8 WC Materials Science, Multidisciplinary SC Materials Science GA DG6SD UT WOS:000372215500008 ER PT J AU Sun, ZQ Song, G Ilavsky, J Liaw, PK AF Sun, Zhiqian Song, Gian Ilavsky, Jan Liaw, Peter K. TI Duplex Precipitates and Their Effects on the Room-temperature Fracture Behaviour of a NiAl-Strengthened Ferritic Alloy SO MATERIALS RESEARCH LETTERS LA English DT Article DE NiAl-strengthened Ferritic Steels; Small-angle X-ray Scattering (SAXS); Precipitation; Fracture; Order Strengthening ID MECHANICAL-PROPERTIES; AL; DESIGN; STEELS AB Duplex precipitates are presented in a NiAl-strengthened ferritic alloy. They were characterized by the ultra-small angle X-ray scattering and transmission electron microscope. Fine cooling precipitates with the size of several to tens of nanometres harden the matrix considerably at room temperature. Cracks are likely to initiate from precipitates, and coalesce and propagate quickly through the matrix due to the excessive hardening effect of cooling precipitates, which lead to the premature fracture of NiAl-strengthened ferritic alloys. C1 [Sun, Zhiqian; Song, Gian; Liaw, Peter K.] Univ Tennessee, Dept Mat Sci & Engn, 1508 Middle Dr, Knoxville, TN 37996 USA. [Ilavsky, Jan] Argonne Natl Lab, Adv Photon Source, Xray Sci Div, Lemont, IL 60439 USA. RP Liaw, PK (reprint author), Univ Tennessee, Dept Mat Sci & Engn, 1508 Middle Dr, Knoxville, TN 37996 USA. EM pliaw@utk.edu RI Song, Gian/F-8880-2016; Ilavsky, Jan/D-4521-2013 OI Song, Gian/0000-0001-7462-384X; Ilavsky, Jan/0000-0003-1982-8900 FU Department of Energy, Office of Fossil Energy [DE-09NT0008089, DE-FE0005868]; National Science Foundation [NSF/CHE-1346572]; U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357] FX The research was supported by the Department of Energy, Office of Fossil Energy, under Grants of DE-09NT0008089 and DE-FE0005868 with Richard Dunst, Vito Cedro, and Patricia Rawls as the program managers. The ChemMatCARS Sector 15, located at the Advanced Photon Source of the Argonne National Laboratory, is principally supported by the National Science Foundation under the grant number of NSF/CHE-1346572. The use of the Advanced Photon Source was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. NR 27 TC 2 Z9 2 U1 0 U2 0 PU TAYLOR & FRANCIS INC PI PHILADELPHIA PA 530 WALNUT STREET, STE 850, PHILADELPHIA, PA 19106 USA SN 2166-3831 J9 MATER RES LETT JI Mater. Res. Lett. PY 2015 VL 3 IS 3 BP 128 EP 134 DI 10.1080/21663831.2015.1021492 PG 7 WC Materials Science, Multidisciplinary SC Materials Science GA DG6TP UT WOS:000372219300002 ER PT J AU Sun, C Martinez, E Aguiar, JA Caro, A Valdez, JA Baldwin, K Xu, Y Uberuaga, BP Anderoglu, O Maloy, SA AF Sun, C. Martinez, E. Aguiar, J. A. Caro, A. Valdez, J. A. Baldwin, K. Xu, Y. Uberuaga, B. P. Anderoglu, O. Maloy, S. A. TI Thermally Induced Interdiffusion and Precipitation in a Ni/Ni3Al System SO MATERIALS RESEARCH LETTERS LA English DT Article DE Ni-based Superalloy; Interdiffusion; Precipitation; Ni/Ni3Al Interface; Thermal Annealing ID NICKEL-BASE SUPERALLOYS; INTERMETALLIC COMPOUNDS; GAMMA'-PHASE; DIFFUSION; AL; KINETICS; GROWTH AB Ordered Ni3Al intermetallic precipitates constitute the main hardening sources of Ni-based superalloys. Here, we report the interdiffusion and precipitation behavior in a Ni/Ni3Al model system. The deposition of Ni3Al on a pure Ni layer at 500 degrees C generated L1(2)-structured gamma' (Ni3Al) precipitates, preferentially at the interface. After annealing at 800 degrees C for 1 h, interdiffusion between Ni and Ni3Al layers occurred, and the gamma' precipitates that grew near the parent Ni/Ni3Al interface are similar to 2.8 times larger in size than those formed in the matrix. Monte Carlo simulations indicate that vacancies preferentially diffuse along the Ni/Ni3Al interface, increasing the probability of precipitation. C1 [Sun, C.; Martinez, E.; Caro, A.; Valdez, J. A.; Baldwin, K.; Xu, Y.; Uberuaga, B. P.; Anderoglu, O.; Maloy, S. A.] Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. [Aguiar, J. A.] Natl Renewable Energy Lab, Golden, CO 80401 USA. RP Sun, C (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. EM csun@lanl.gov RI Maloy, Stuart/A-8672-2009; OI Maloy, Stuart/0000-0001-8037-1319; Martinez Saez, Enrique/0000-0002-2690-2622 FU LDRD program in Los Alamos National Laboratory; U.S. DOE [DE-AC52-06NA25396] FX We acknowledge the financial support by LDRD program in Los Alamos National Laboratory. Los Alamos National Laboratory is operated by Los Alamos National Security, LLC, for the National Nuclear Security Administration of the U.S. DOE under contract DE-AC52-06NA25396. We thank Dr Robert Dickerson for helpful discussions. We also acknowledge that parts of the TEM work were performed at the LeRoy Eyring Center for High Resolution Electron Microscopy at Arizona State University (ASU) in collaboration with Toshihiro Aoki, and some of the high-resolution STEM work was conducted at the Center for Nanophase Materials Science, which is a DOE Office of Science User Facility. NR 28 TC 0 Z9 0 U1 0 U2 5 PU TAYLOR & FRANCIS INC PI PHILADELPHIA PA 530 WALNUT STREET, STE 850, PHILADELPHIA, PA 19106 USA SN 2166-3831 J9 MATER RES LETT JI Mater. Res. Lett. PY 2015 VL 3 IS 3 BP 169 EP 175 DI 10.1080/21663831.2015.1045630 PG 7 WC Materials Science, Multidisciplinary SC Materials Science GA DG6TP UT WOS:000372219300008 ER PT J AU Boos, EE Brandt, OE Denisov, DS Denisov, SP Grannis, PD AF Boos, E. E. Brandt, O. E. Denisov, D. S. Denisov, S. P. Grannis, P. D. TI The top quark (20 years after its discovery) SO PHYSICS-USPEKHI LA English DT Review DE collider; experiment; facility; quark; photon; boson; lepton; hadron; meson; baryon ID MODEL HIGGS-BOSON; PROTON-PROTON COLLISIONS; PRODUCTION CROSS-SECTION; SQUARK PAIR PRODUCTION; LEPTON PLUS JETS; PP COLLISIONS; ATLAS DETECTOR; STANDARD-MODEL; ROOT-S=7 TEV; HEAVY QUARKS AB This paper, written to mark the twentieth anniversary of the discovery of the top quark, offers some insight into how the understanding of this heaviest known particle has developed from prediction through search to discovery to the current knowledge of its production mechanisms and properties. The central role of the top quark in the Standard Model is considered, and the window of opportunity it opens for seeking new physics beyond the Standard Model is discussed. C1 [Boos, E. E.] Moscow MV Lomonosov State Univ, Skobeltsyn Inst Nucl Phys, Leninskie Gory 1,Str 2, Moscow 119991, Russia. [Brandt, O. E.] Heidelberg Univ, Kirchhoff Inst Phys, D-69120 Heidelberg, Germany. [Denisov, D. S.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. [Denisov, S. P.] Natl Res Ctr, Kurchatov Inst, Inst High Energy Phys, Protvino 142281, Moscow Region, Russia. [Grannis, P. D.] SUNY Stony Brook, Stony Brook, NY 11794 USA. RP Boos, EE (reprint author), Moscow MV Lomonosov State Univ, Skobeltsyn Inst Nucl Phys, Leninskie Gory 1,Str 2, Moscow 119991, Russia. EM boos@theory.sinp.msu.ru; obrandt@kip.uni-heidelberg.de; denisovd@fnal.gov; denisov@ihep.ru; pgrannis@sunysb.edu FU Federal Ministry of Education and Research (Germany); Ministry of Education and Science of the Russian Federation; National Research Centre 'Kurchatov Institute' of the Russian Federation; Russian Foundation for Basic Research (Russia); Department of Energy; National Science Foundation (United States); Ministry of Education and Science of the Russian Federation [NS-3042.2014.2] FX We gratefully acknowledge support from the Federal Ministry of Education and Research (Germany); the Ministry of Education and Science of the Russian Federation, the National Research Centre 'Kurchatov Institute' of the Russian Federation, the Russian Foundation for Basic Research (Russia), and the Department of Energy and the National Science Foundation (United States). The work of one of us (E E B) was partially supported by the Ministry of Education and Science of the Russian Federation under grant No. NS-3042.2014.2. NR 249 TC 1 Z9 1 U1 20 U2 59 PU TURPION LTD PI BRISTOL PA C/O TURPION LTD, IOP PUBLISHING, TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6HG, ENGLAND SN 1063-7869 EI 1468-4780 J9 PHYS-USP+ JI Phys. Usp. PY 2015 VL 58 IS 12 BP 1133 EP 1158 DI 10.3367/UFNe.0185.201512a.1241 PG 26 WC Physics, Multidisciplinary SC Physics GA DG2RC UT WOS:000371914300001 ER PT S AU Geisz, JF Garcia, I McMahon, WE Steiner, MA Ochoa, M France, RM Habte, A Friedman, DJ AF Geisz, John F. Garcia, Ivan McMahon, William E. Steiner, Myles A. Ochoa, Mario France, Ryan M. Habte, Aron Friedman, Daniel J. BE Siefer, G Baudrit, M Anton, I TI Energy Yield Determination of Concentrator Solar Cells Using Laboratory Measurements SO 11TH INTERNATIONAL CONFERENCE ON CONCENTRATOR PHOTOVOLTAIC SYSTEMS (CPV-11) SE AIP Conference Proceedings LA English DT Proceedings Paper CT 11th International Conference on Concentrator Photovoltaic Systems (CPV) CY APR 13-15, 2015 CL Aix les Bains, FRANCE AB The annual energy conversion efficiency is calculated for a four junction inverted metamorphic solar cell that has been completely characterized in the laboratory at room temperature using measurements fit to a comprehensive optoelectronic model of the multijunction solar cells. A simple model of the temperature dependence is used predict the performance of the solar cell under varying temperature and spectra characteristic of Golden, CO for an entire year. The annual energy conversion efficiency is calculated by integrating the predicted cell performance over the entire year. The effects of geometric concentration, CPV system thermal characteristics, and luminescent coupling are highlighted. C1 [Geisz, John F.; Garcia, Ivan; McMahon, William E.; Steiner, Myles A.; Ochoa, Mario; France, Ryan M.; Habte, Aron; Friedman, Daniel J.] Natl Renewable Energy Lab, Golden, CO 80401 USA. [Garcia, Ivan; Ochoa, Mario] Univ Politecn Madrid, Inst Energia Solar, E-28040 Madrid, Spain. RP Geisz, JF (reprint author), Natl Renewable Energy Lab, Golden, CO 80401 USA. EM john.geisz@nrel.gov RI Garcia, Ivan/L-1547-2014 OI Garcia, Ivan/0000-0002-9895-2020 NR 6 TC 0 Z9 0 U1 0 U2 3 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0094-243X BN 978-0-7354-1326-9 J9 AIP CONF PROC PY 2015 VL 1679 AR 040005 DI 10.1063/1.4931516 PG 8 WC Energy & Fuels; Engineering, Electrical & Electronic; Physics, Applied SC Energy & Fuels; Engineering; Physics GA BE4KO UT WOS:000371822900016 ER PT S AU Horowitz, KAW Woodhouse, M Lee, H Smestad, GP AF Horowitz, Kelsey A. W. Woodhouse, Michael Lee, Hohyun Smestad, Greg P. BE Siefer, G Baudrit, M Anton, I TI A Bottom-Up Cost Analysis of a High Concentration PV Module SO 11TH INTERNATIONAL CONFERENCE ON CONCENTRATOR PHOTOVOLTAIC SYSTEMS (CPV-11) SE AIP Conference Proceedings LA English DT Proceedings Paper CT 11th International Conference on Concentrator Photovoltaic Systems (CPV) CY APR 13-15, 2015 CL Aix les Bains, FRANCE AB We present a bottom-up model of III-V multi-junction cells, as well as a high concentration PV (HCPV) module. We calculate $0.59/W-(DC) manufacturing costs for our model HCPV module design with today's capabilities, and find that reducing cell costs and increasing module efficiency offer the most promising paths for future cost reductions. Cell costs could be significantly reduced via substrate reuse and improved manufacturing yields. C1 [Horowitz, Kelsey A. W.; Woodhouse, Michael] Natl Renewable Energy Lab, 15013 Denver West Pkwy, Golden, CO 80401 USA. [Lee, Hohyun] Santa Clara Univ, Santa Clara, CA 95053 USA. [Smestad, Greg P.] Sol Ideas Technol Dev, San Jose, CA 95150 USA. RP Horowitz, KAW (reprint author), Natl Renewable Energy Lab, 15013 Denver West Pkwy, Golden, CO 80401 USA. EM Kelsey.Horowitz@nrel.gov; Michael.Woodhouse@nrel.gov NR 12 TC 3 Z9 3 U1 0 U2 1 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0094-243X BN 978-0-7354-1326-9 J9 AIP CONF PROC PY 2015 VL 1679 AR 100001 DI 10.1063/1.4931548 PG 6 WC Energy & Fuels; Engineering, Electrical & Electronic; Physics, Applied SC Energy & Fuels; Engineering; Physics GA BE4KO UT WOS:000371822900048 ER PT S AU Kinsey, GS AF Kinsey, Geoffrey S. BE Siefer, G Baudrit, M Anton, I TI Spectrum Sensitivity, Energy Yield, and Revenue Prediction of PV and CPV Modules SO 11TH INTERNATIONAL CONFERENCE ON CONCENTRATOR PHOTOVOLTAIC SYSTEMS (CPV-11) SE AIP Conference Proceedings LA English DT Proceedings Paper CT 11th International Conference on Concentrator Photovoltaic Systems (CPV) CY APR 13-15, 2015 CL Aix les Bains, FRANCE ID DIRECT SOLAR TRANSMITTANCE; BROAD-BAND MODELS; IRRADIANCE PREDICTIONS; EFFICIENCY; PERFORMANCE; CELLS; JUNCTION AB Impact on module performance of spectral irradiance variation has been determined for III-V multijunctions compared against the four most common flat-plate module types (cadmium telluride, multicrystalline silicon, copper indium gallium selenide, and monocrystalline silicon. Hour-by-hour representative spectra were generated using atmospheric variables for Albuquerque, New Mexico, USA. Convolution with published values for external quantum efficiency gave the predicted current output. When combined with specifications of commercial PV modules, energy yield and revenue were predicted. This approach provides a means for optimizing PV module design based on various site-specific temporal variables. C1 [Kinsey, Geoffrey S.] US DOE, 950 LEnfant Plaza, Washington, DC 20024 USA. RP Kinsey, GS (reprint author), US DOE, 950 LEnfant Plaza, Washington, DC 20024 USA. EM Geoffrey.kinsey@ee.doe.gov NR 27 TC 1 Z9 1 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0094-243X BN 978-0-7354-1326-9 J9 AIP CONF PROC PY 2015 VL 1679 AR 030003 DI 10.1063/1.4931507 PG 5 WC Energy & Fuels; Engineering, Electrical & Electronic; Physics, Applied SC Energy & Fuels; Engineering; Physics GA BE4KO UT WOS:000371822900007 ER PT S AU Miller, DC Arndt, T Kogler, R AF Miller, David C. Arndt, Thomas Kogler, Rene BE Siefer, G Baudrit, M Anton, I TI Characteristics of a Veteran Acrylic Lens Relative to Acrylic Lens Materials After Accelerated Laboratory Weathering SO 11TH INTERNATIONAL CONFERENCE ON CONCENTRATOR PHOTOVOLTAIC SYSTEMS (CPV-11) SE AIP Conference Proceedings LA English DT Proceedings Paper CT 11th International Conference on Concentrator Photovoltaic Systems (CPV) CY APR 13-15, 2015 CL Aix les Bains, FRANCE AB The durability of poly(methyl methacrylate) is examined using veteran lenses obtained from CPV modules fielded for 27 years in Phoenix. The lens facets were milled from the lens interior, followed by depth-specific toming to characterize variation at four depths through the thickness. Optical transmittance was measured using a spectrophotometer, both with and without an integrating sphere. Diffuse transmittance (the optical haze) and yellowness index were determined from the transmittance. Molecular weight was characterized using size exclusion chromatography, also in conjunction with the toming. The veteran lens material is compared to contemporary PMMA formulations, aged in an indoor chamber. The modest reductions in transmittance and molecular weight for the lenses were generally similar to those of the contemporary materials, suggesting an indoor accelerated aging test might be used; additional tests must, however, be applied to invoke the haze, uniquely observed for the lens specimen. C1 [Miller, David C.] Natl Renewable Energy Lab, 15013 Denver West Pkwy, Golden, CO 80401 USA. [Arndt, Thomas; Kogler, Rene] Evon Ind AG, D-64293 Darmstadt, Germany. RP Miller, DC (reprint author), Natl Renewable Energy Lab, 15013 Denver West Pkwy, Golden, CO 80401 USA. EM David.Miller@nrel.gov; Thomas.Arndt@evonik.com; Rene.Kogler@evonik.com NR 4 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0094-243X BN 978-0-7354-1326-9 J9 AIP CONF PROC PY 2015 VL 1679 AR 020003 DI 10.1063/1.4931503 PG 4 WC Energy & Fuels; Engineering, Electrical & Electronic; Physics, Applied SC Energy & Fuels; Engineering; Physics GA BE4KO UT WOS:000371822900003 ER PT S AU Muller, M Jordan, D Kurtz, S AF Muller, Matthew Jordan, Dirk Kurtz, Sarah BE Siefer, G Baudrit, M Anton, I TI Degradation Analysis of a CPV Module After Six Years On-sun SO 11TH INTERNATIONAL CONFERENCE ON CONCENTRATOR PHOTOVOLTAIC SYSTEMS (CPV-11) SE AIP Conference Proceedings LA English DT Proceedings Paper CT 11th International Conference on Concentrator Photovoltaic Systems (CPV) CY APR 13-15, 2015 CL Aix les Bains, FRANCE AB There are many publications in the literature that determine long-term degradation of PV modules and systems but there is little in this area on CPV due to this industry's young age. This work focuses on analyzing the degradation of a Soitec CPV module (Concentrix CX200-09) which has been on-sun at NREL since early 2009. Furthermore the focus is on determining the applicability of degradation calculation procedures that have been developed using flat plate PV data. C1 [Muller, Matthew; Jordan, Dirk; Kurtz, Sarah] Natl Renewable Energy Lab, Golden, CO 80401 USA. RP Muller, M (reprint author), Natl Renewable Energy Lab, Golden, CO 80401 USA. EM matthew.muller@nrel.gov NR 15 TC 0 Z9 0 U1 1 U2 1 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0094-243X BN 978-0-7354-1326-9 J9 AIP CONF PROC PY 2015 VL 1679 AR 020004 DI 10.1063/1.4931504 PG 7 WC Energy & Fuels; Engineering, Electrical & Electronic; Physics, Applied SC Energy & Fuels; Engineering; Physics GA BE4KO UT WOS:000371822900004 ER PT S AU Miller, EK AF Miller, Edmund K. GP IEEE TI Why Current Decay on a Wire Causes Radiation SO 2015 IEEE INTERNATIONAL SYMPOSIUM ON ANTENNAS AND PROPAGATION & USNC/URSI NATIONAL RADIO SCIENCE MEETING SE IEEE Antennas and Propagation Society International Symposium LA English DT Proceedings Paper CT IEEE International Symposium on Antennas and Propagation / USNC/URSI National North American Radio Science Meeting CY JUL 19-24, 2015 CL Vancouver, CANADA SP Inst Elect & Elect Engineers, IEEE Antennas & Propagat Soc, USNC, URSI AB The decay of current with increasing distance from the feedpoint of a straight wire antenna comprised of a perfect electric conductor has been attributed to radiation by numerous authors, e.g. [1-5]. This connection is explained here using a time-domain solution for an impulsively excited wire and relating this to the E-field kink model of radiation. C1 [Miller, Edmund K.] Los Alamos Natl Lab, Lincoln, CA USA. EM e.miller@ieee.org NR 8 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1522-3965 BN 978-1-4799-7815-1 J9 IEEE ANTENNAS PROP PY 2015 BP 842 EP 843 PG 2 WC Telecommunications SC Telecommunications GA BE3YW UT WOS:000371401400411 ER PT S AU Manic, AB Notaros, BM Rouet, FH Li, XS AF Manic, Ana B. Notaros, Branislav M. Rouet, Francois-Henry Li, Xiaoye Sherry GP IEEE TI Efficient EM Scattering Analysis Based on MoM, HSS Direct Solver, and RRQR Decomposition SO 2015 IEEE INTERNATIONAL SYMPOSIUM ON ANTENNAS AND PROPAGATION & USNC/URSI NATIONAL RADIO SCIENCE MEETING SE IEEE Antennas and Propagation Society International Symposium LA English DT Proceedings Paper CT IEEE International Symposium on Antennas and Propagation / USNC/URSI National North American Radio Science Meeting CY JUL 19-24, 2015 CL Vancouver, CANADA SP Inst Elect & Elect Engineers, IEEE Antennas & Propagat Soc, USNC, URSI AB A novel technique is presented for efficient electromagnetic (EM) scattering analysis based on a double (geometrical and current-approximation) higher order method of moments (MoM) in the surface integral equation (SIE) formulation in conjunction with a fast parallel direct solver for dense linear systems using hierarchically semiseparable structures (HSS). MoM-SIE matrix blocks are replaced by their low-rank approximations obtained by the rank-revealing QR (RRQR) decomposition for memory compression. Numerical example shows a dramatic memory compression using the novel method while preserving the accuracy of the solution. C1 [Manic, Ana B.; Notaros, Branislav M.] Colorado State Univ, Dept Elect & Comp Engn, Ft Collins, CO 80523 USA. [Rouet, Francois-Henry; Li, Xiaoye Sherry] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Computat Res Div, Berkeley, CA 94720 USA. RP Manic, AB (reprint author), Colorado State Univ, Dept Elect & Comp Engn, Ft Collins, CO 80523 USA. EM anamanic@engr.colostate.edu; notaros@colostate.edu; fhrouet@lbl.gov; xsli@lbl.gov NR 3 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1522-3965 BN 978-1-4799-7815-1 J9 IEEE ANTENNAS PROP PY 2015 BP 1660 EP 1661 PG 2 WC Telecommunications SC Telecommunications GA BE3YW UT WOS:000371401401380 ER PT S AU Jeon, JH Chang, JT Pham, AV AF Jeon, Jae H. Chang, John T. Anh-Vu Pham GP IEEE TI Archimedean Spiral Antenna With An Integrated Dual Bandstop Response SO 2015 IEEE INTERNATIONAL SYMPOSIUM ON ANTENNAS AND PROPAGATION & USNC/URSI NATIONAL RADIO SCIENCE MEETING SE IEEE Antennas and Propagation Society International Symposium LA English DT Proceedings Paper CT IEEE International Symposium on Antennas and Propagation / USNC/URSI National North American Radio Science Meeting CY JUL 19-24, 2015 CL Vancouver, CANADA SP Inst Elect & Elect Engineers, IEEE Antennas & Propagat Soc, USNC, URSI AB An ultra-wideband Archimedean spiral antenna with an integrated notch filter response at 3.4 GHz and 5.5 GHz is presented. Two pairs of resonant parallel structures are implemented on a generic Archimedean spiral antenna to induce dual bandstop characteristics. Measured results on a fabricated antenna prototype experimentally confirm simulation results. C1 [Jeon, Jae H.; Chang, John T.] Lawrence Livermore Natl Lab, Livermore, CA USA. [Anh-Vu Pham] Univ Calif Davis, Dept Elect & Comp Engn, Davis, CA 95616 USA. RP Jeon, JH (reprint author), Lawrence Livermore Natl Lab, Livermore, CA USA. EM jeon2@llnl.gov; chang16@llnl.gov; pham@ece.ucdavis.edu NR 3 TC 1 Z9 1 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1522-3965 BN 978-1-4799-7815-1 J9 IEEE ANTENNAS PROP PY 2015 BP 1984 EP 1985 PG 2 WC Telecommunications SC Telecommunications GA BE3YW UT WOS:000371401402028 ER PT S AU Fahim, F Fathipouri, V Deptuch, G Mohseni, H AF Fahim, Farah Fathipouri, Vala Deptuch, Grzegorz Mohseni, Hooman GP IEEE TI Pixellated readout IC: Analysis for single photon infrared detector for fast time of arrival applications SO 2015 IEEE INTERNATIONAL SYMPOSIUM ON CIRCUITS AND SYSTEMS (ISCAS) SE IEEE International Symposium on Circuits and Systems LA English DT Proceedings Paper CT IEEE International Symposium on Circuits and Systems (ISCAS) CY MAY 24-27, 2015 CL Lisbon, PORTUGAL SP IEEE DE single photon detection; photon counting; time of arrival; dead-time less readout ID NOISE AB The nano-injection sensor is a new approach towards high-sensitivity short-wave infrared photon imagers. It resolves the conflict of requiring a large area for high quantum efficiency and small area for high fidelity by using a relatively large micron-scale absorbing volume, and nano-scale sensing elements, which regulates the electron flow and amplifies the signal. The front-end electronics for the Single Photon Imaging nano-injection detector consists of an ROIC with 32 x 32 pixel array with a pixel size of 100 m x 100p.m. Each pixel consists of a charge sensitive preamplifier with leakage current compensation circuit, a shaping amplifier, an AC-coupled comparator with a 7 bit trimming DAC for offset cancellation, a 10-bit counter for photon counting, and a 10-bit shift register for data readout. The ROIC provides dead-time less, continuous readout with 32 parallel LVDS outputs to achieve full frame readout within C1 [Fahim, Farah; Fathipouri, Vala; Mohseni, Hooman] Northwestern Univ, Dept Elect Engn, 2145 Sheridan Rd, Evanston, IL 60208 USA. [Fahim, Farah; Deptuch, Grzegorz] Fermilab Natl Accelerator Lab, ASIC Dev Grp, Dept Elect Engn, Particle Phys Div, BP 500,MS 222, Batavia, IL 60510 USA. RP Fahim, F (reprint author), Northwestern Univ, Dept Elect Engn, 2145 Sheridan Rd, Evanston, IL 60208 USA. EM farah@fnal.gov; valafathipour2016@u.northwestern.edu; deptuch@ieee.org; hmohseni@northwestern.edu RI Mohseni, Hooman/B-7253-2009 NR 7 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 0271-4302 BN 978-1-4799-8391-9 J9 IEEE INT SYMP CIRC S PY 2015 BP 682 EP 685 PG 4 WC Engineering, Electrical & Electronic SC Engineering GA BE4BG UT WOS:000371471000168 ER PT S AU Balasa, F Abuaesh, N Gingu, CV Zhu, HW AF Balasa, Florin Abuaesh, Noha Gingu, Cristian V. Zhu, Hongwei GP IEEE TI Optimization of Memory Banking in Embedded Multidimensional Signal Processing Applications SO 2015 IEEE INTERNATIONAL SYMPOSIUM ON CIRCUITS AND SYSTEMS (ISCAS) SE IEEE International Symposium on Circuits and Systems LA English DT Proceedings Paper CT IEEE International Symposium on Circuits and Systems (ISCAS) CY MAY 24-27, 2015 CL Lisbon, PORTUGAL SP IEEE AB Hierarchical memory organizations are used in embedded systems to reduce energy consumption and improve performance by assigning the frequently-accessed data to the low levels of memory hierarchy. Within a given level of hierarchy, energy and access times can be further reduced by memory banking. This paper addresses the problem of banking optimization, presenting a dynamic programming approach that takes into account all three major design objectives-energy consumption, performance, and die area, letting the designers decide on their relative importance for a specific project. The time complexity is independent of the size of the storage access trace and of the memory size - a significant advantage in terms of computation speed when these two parameters are large. C1 [Balasa, Florin; Abuaesh, Noha] Amer Univ Cairo, Dept Comp Sci & Engn, Cairo, Egypt. [Gingu, Cristian V.] Fermilab Natl Accelerator Lab, Batavia, IL 60555 USA. [Zhu, Hongwei] ARM Inc, San Jose, CA 95134 USA. RP Balasa, F (reprint author), Amer Univ Cairo, Dept Comp Sci & Engn, Cairo, Egypt. NR 10 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 0271-4302 BN 978-1-4799-8391-9 J9 IEEE INT SYMP CIRC S PY 2015 BP 2880 EP 2883 PG 4 WC Engineering, Electrical & Electronic SC Engineering GA BE4BG UT WOS:000371471003041 ER PT S AU Majid, A Moradi, L Farhang-Boroujeny, B AF Majid, Arslan Moradi, Liussein Farhang-Boroujeny, Behrouz GP IEEE TI Secure Information Transmission in Filter Bank Multi-Carrier Spread Spectrum Systems SO 2015 IEEE MILITARY COMMUNICATIONS CONFERENCE (MILCOM 2015) SE IEEE Military Communications Conference LA English DT Proceedings Paper CT 34th IEEE Annual Military Communications Conference (MILCOM) on Leveraging Technology - The Joint Imperative CY OCT 26-28, 2015 CL Tampa, FL SP IEEE ID ARTIFICIAL NOISE; SECRET KEYS AB This paper presents a novel method for generating a secret key to augment the security of spread spectrum systems. The proposed key generation takes advantage of the channel reciprocity exhibited between two communicating parties. We validate the key generation aspect of our system by using real-world measurements. We note that the strongest path in the channel impulse response can be the main source that will allow an adversary to generate a similar key to those of the legitimate nodes. We resolve this problem by introducing an augmentation that removes the strongest path from the channel impulse response before key generation. This augmentation, that we call strongest path cancellation (SPC), is found very effective. We also note that the generated keys need not be perfectly the same at the legitimate nodes, hence, the proposed method belongs to the class of fault tolerant secure communications. In this paper, without any loss of generality, we use the proposed key generation method as part of a filter bank muiticarrier spread spectrum (FB-MC-SS) system, where robust performance against narrow and/or partial band interference is also guaranteed. C1 [Majid, Arslan; Farhang-Boroujeny, Behrouz] Univ Utah, Dept Elect & Comp Engn, Salt Lake City, UT USA. [Moradi, Liussein] Idaho Natl Lab, Wireless Res Team, Idaho Falls, ID 83415 USA. RP Majid, A (reprint author), Univ Utah, Dept Elect & Comp Engn, Salt Lake City, UT USA. EM majid@eng.utah.edu; hussein.moradi@inl.gov; farhang@ece.utah.edu NR 22 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2155-7578 BN 978-1-5090-0073-9 J9 IEEE MILIT COMMUN C PY 2015 BP 287 EP 293 PG 7 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA BE3YS UT WOS:000371395200049 ER PT S AU Chen, IR Mitchell, R Cho, JH AF Chen, Ing-Ray Mitchell, Robert Cho, Jin-Hee GP IEEE TI On Modeling of Adversary Behavior and Defense for Survivability of Military MANET Applications SO 2015 IEEE MILITARY COMMUNICATIONS CONFERENCE (MILCOM 2015) SE IEEE Military Communications Conference LA English DT Proceedings Paper CT 34th IEEE Annual Military Communications Conference (MILCOM) on Leveraging Technology - The Joint Imperative CY OCT 26-28, 2015 CL Tampa, FL SP IEEE DE mobile ad hoc networks; reliability; adversary modeling; defense behavior modeling; survivability ID AD HOC NETWORKS; ADMISSION CONTROL ALGORITHMS; PERFORMANCE ANALYSIS; TRUST MANAGEMENT; FORWARDING STRATEGIES; LOCATION MANAGEMENT; INTRUSION DETECTION; MULTIMEDIA SERVERS; MOBILE NETWORKS; OPTIMIZATION AB In this paper we develop a methodology and report preliminary results for modeling attack/defense behaviors for achieving high survivability of military mobile ad hoc networks (MANETs). Our methodology consists of 3 steps. The first step is to model adversary behavior of capture attackers and inside attackers which can dynamically and adaptively trigger the best attack strategies while avoiding detection and eviction. The second step is to model defense behavior of defenders utilizing intrusion detection and tolerance strategies to reactively and proactively counter dynamic adversary behavior. We leverage game theory to model attack/defense dynamics with the players being the attackers/defenders, the actions being the attack/defense strategies identified, and the payoff for each outcome being related to system survivability. The 3rd and final step is to identify and apply proper solution techniques that can effectively and efficiently analyze attack/defense dynamics as modeled by game theory for guiding the creation of effective defense strategies for assuring high survivability in military MANETs. The end product is a tool that is capable of analyzing a myriad of attacker behaviors and seeing the effectiveness of countering adaptive defense strategies which incorporate attack/defense dynamics. C1 [Chen, Ing-Ray] Virginia Tech, Dept Comp Sci, Blacksburg, VA USA. [Mitchell, Robert] Sandia Natl Labs, Cybersecur Dept, Livermore, CA 94550 USA. [Cho, Jin-Hee] US Army Res Lab, Computat & Informat Sci Directorate, Adelphi, MD 20783 USA. RP Cho, JH (reprint author), US Army Res Lab, Computat & Informat Sci Directorate, Adelphi, MD 20783 USA. EM irchen@vt.edu; rrmitche@vt.edu; jinhee.cho@us.army.mil NR 35 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2155-7578 BN 978-1-5090-0073-9 J9 IEEE MILIT COMMUN C PY 2015 BP 629 EP 634 PG 6 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA BE3YS UT WOS:000371395200106 ER PT S AU Van Leeuwen, B Stout, WMS Urias, V AF Van Leeuwen, Brian Stout, William M. S. Urias, Vincent GP IEEE TI Operational Cost of Deploying Moving Target Defenses Defensive Work Factors SO 2015 IEEE MILITARY COMMUNICATIONS CONFERENCE (MILCOM 2015) SE IEEE Military Communications Conference LA English DT Proceedings Paper CT 34th IEEE Annual Military Communications Conference (MILCOM) on Leveraging Technology - The Joint Imperative CY OCT 26-28, 2015 CL Tampa, FL SP IEEE DE moving target defense; metrics; defensive work factors AB Moving Target Defense (MTD) is the concept of controlling change across multiple information system dimensions with the objective of increasing uncertainty and complexity for attackers. Increased uncertainty and complexity will increase the costs of malicious probing and attack efforts and thus prevent or limit network intrusion. As MTD increases complexity of the system for the attacker, the MTD also increases complexity in the desired operation of the system. This introduced complexity results in more difficult network troubleshooting and can cause network degradation or longer network outages. In this research paper the authors describe the defensive work factor concept. Defensive work factors considers in detail the specific impact that the MTD approach has on computing resources and network resources. Measuring impacts on system performance along with identifying how network services (e.g., DHCP, DNS, in-place security mechanisms) are affected by the MTD approach are presented. Also included is a case study of an MTD deployment and the defensive work factor costs. An actual experiment is constructed and metrics are described for the use case. C1 [Van Leeuwen, Brian; Stout, William M. S.; Urias, Vincent] Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. RP Van Leeuwen, B (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. EM bpvanle@sandia.gov; wmstout@sandia.gov; veuria@sandia.gov NR 10 TC 2 Z9 2 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2155-7578 BN 978-1-5090-0073-9 J9 IEEE MILIT COMMUN C PY 2015 BP 966 EP 971 PG 6 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA BE3YS UT WOS:000371395200162 ER PT S AU Carroll, TE Chikkagoudar, S Arthur-Durett, K AF Carroll, Thomas E. Chikkagoudar, Satish Arthur-Durett, Kristine GP IEEE TI Impact of Network Activity Levels on the Performance of Passive Network Service Dependency Discovery SO 2015 IEEE MILITARY COMMUNICATIONS CONFERENCE (MILCOM 2015) SE IEEE Military Communications Conference LA English DT Proceedings Paper CT 34th IEEE Annual Military Communications Conference (MILCOM) on Leveraging Technology - The Joint Imperative CY OCT 26-28, 2015 CL Tampa, FL SP IEEE AB Network services often depend on other services distributed throughout a network to function correctly. If a service fails, is disrupted, or is degraded, it is likely to impair other services. The web of dependencies can be surprisingly complex-especially within a large enterprise network-and evolve over time. Acquiring, maintaining, and understanding dependency knowledge is critical for many network management and cyber defense activities, such as cyber mission mapping. While automation can improve situation awareness for network operators and cyber practitioners, poor detection performance reduces their confidence and can complicate their roles. In this paper, we study the effects of network activity levels on the detection performance of passive network-based service dependency discovery methods. The performance of all methods except for one were inconsistent with respect to network activity levels. Our proposed cross-correlation method was particularly robust to the influence of network activity. The proposed experimental treatment will further advance a more scientific evaluation of methods and provide a foundation to determine their operational boundaries. C1 [Carroll, Thomas E.; Chikkagoudar, Satish; Arthur-Durett, Kristine] Pacific NW Natl Lab, Computat & Stat Analyt, Richland, WA 99354 USA. RP Carroll, TE (reprint author), Pacific NW Natl Lab, Computat & Stat Analyt, Richland, WA 99354 USA. EM Thomas.Carroll@pnnl.gov; Satish.Chikkagoudar@pnnl.gov; Kristine.Arthur@pnnl.gov NR 17 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2155-7578 BN 978-1-5090-0073-9 J9 IEEE MILIT COMMUN C PY 2015 BP 1341 EP 1347 PG 7 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA BE3YS UT WOS:000371395200223 ER PT S AU Laraway, SA Moradi, H Farhang-Boroujeny, B AF Laraway, Stephen Andrew Moradi, Hussein Farhang-Boroujeny, Behrouz GP IEEE TI HF Band Filter Bank Multi-Carrier Spread Spectrum SO 2015 IEEE MILITARY COMMUNICATIONS CONFERENCE (MILCOM 2015) SE IEEE Military Communications Conference LA English DT Proceedings Paper CT 34th IEEE Annual Military Communications Conference (MILCOM) on Leveraging Technology - The Joint Imperative CY OCT 26-28, 2015 CL Tampa, FL SP IEEE ID CHANNELS; SYSTEM; CDMA AB A recent study has introduced a new spread spectrum waveform based on filter bank multicarrier techniques. The proposed waveform that is called FB-MC-SS offers the advantages of simple implementation and robust performance when it is subject to narrow/partial band interference. This paper describes modifications to the FB-MC-SS system to enable its successful application to the HF skywave channels. We find FB-MC-SS well suited for the HF communications as it shows excellent performance in channels with frequency selective fading and interference. This paper describes new algorithms for packet detection, timing recovery and equalization that are suitable for the HF channel. Also, an algorithm for optimizing the peak to average power ratio (PAPR) of the FB-MC-SS waveform is presented. Application of this algorithm results in a waveform with a very low PAPR of about 4 dB. Simulation results using a wide band HF channel model demonstrate the robustness of this system over a wide range of delay and Doppler spreads. C1 [Laraway, Stephen Andrew; Farhang-Boroujeny, Behrouz] Univ Utah, Dept Elect & Comp Engn, Salt Lake City, UT USA. [Moradi, Hussein] Idaho Natl Lab, Wireless Res Team, Idaho Falls, ID 83415 USA. RP Laraway, SA (reprint author), Univ Utah, Dept Elect & Comp Engn, Salt Lake City, UT USA. EM andylaraway@yahoo.com; hussein.moradi@inl.gov; farhang@ece.utah.edu NR 28 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2155-7578 BN 978-1-5090-0073-9 J9 IEEE MILIT COMMUN C PY 2015 BP 1445 EP 1453 PG 9 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA BE3YS UT WOS:000371395200240 ER PT S AU Akhlaghi, S Zhou, N Huang, Z AF Akhlaghi, Shahrokh Zhou, Ning Huang, Zhenyu GP IEEE TI Exploring Adaptive Interpolation to Mitigate Non-Linear Impact on Estimating Dynamic States SO 2015 IEEE POWER & ENERGY SOCIETY GENERAL MEETING SE IEEE Power and Energy Society General Meeting PESGM LA English DT Proceedings Paper CT General Meeting of the IEEE-Power-and-Energy-Society CY JUL 26-30, 2015 CL Denver, CO SP IEEE Power & Energy Soc DE Extended Kalman Filter (EKF); Phasor Measurement Unit (PMU); Power System Dynamics; Quasilinearity Test; State Estimation (SE) AB Accurate estimation of dynamic states is important for monitoring and controlling transient stability. This paper proposes an adaptive interpolation approach to improve the performance of the Extended Kalman Filter (EKF) for estimating dynamic states of a synchronous machine. This approach consists of two major steps. First, the non-linearity of state transition function and measurement function is quantified. Second, when the non-linearity is severe, pseudo measurements are added through interpolation to mitigate the negative impact of non-linearity on the estimation accuracy. Using the 2-area model, it is shown that the proposed adaptive interpolation approach can make a good tradeoff between estimation accuracy and computation time when estimating the dynamic states of a synchronous machine. C1 [Akhlaghi, Shahrokh; Zhou, Ning] SUNY Binghamton, Dept Elect & Comp Engn, Binghamton, NY USA. [Huang, Zhenyu] Pacific NW Natl Lab, Richland, WA 99352 USA. RP Akhlaghi, S (reprint author), SUNY Binghamton, Dept Elect & Comp Engn, Binghamton, NY USA. EM Sakhlag1@binghamton.edu; ningzhou@binghamton.edu; zhenyu.huang@pnnl.gov RI Akhlaghi, Shahrokh/C-2316-2017 OI Akhlaghi, Shahrokh/0000-0002-7982-1631 NR 17 TC 0 Z9 0 U1 1 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1944-9925 BN 978-1-4673-8040-9 J9 IEEE POW ENER SOC GE PY 2015 PG 5 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE3YU UT WOS:000371397501013 ER PT S AU Arnold, DB Negrete-Pincetic, M Stewart, EM Auslander, DM Callaway, DS AF Arnold, Daniel B. Negrete-Pincetic, Matias Stewart, Emma M. Auslander, David M. Callaway, Duncan S. GP IEEE TI Extremum Seeking Control of Smart Inverters for VAR Compensation SO 2015 IEEE POWER & ENERGY SOCIETY GENERAL MEETING SE IEEE Power and Energy Society General Meeting PESGM LA English DT Proceedings Paper CT General Meeting of the IEEE-Power-and-Energy-Society CY JUL 26-30, 2015 CL Denver, CO SP IEEE Power & Energy Soc AB Reactive power compensation is used by utilities to ensure customer voltages are within pre-defined tolerances and reduce system resistive losses. While much attention has been paid to model-based control algorithms for reactive power support and Volt Var Optimization (VVO), these strategies typically require relatively large communications capabilities and accurate models. In this work, a non-model-based control strategy for smart inverters is considered for VAR compensation. An Extremum Seeking control algorithm is applied to modulate the reactive power output of inverters based on real power information from the feeder substation, without an explicit feeder model. Simulation results using utility demand information confirm the ability of the control algorithm to inject VARs to minimize feeder head real power consumption. In addition, we show that the algorithm is capable of improving feeder voltage profiles and reducing reactive power supplied by the distribution substation. C1 [Arnold, Daniel B.; Auslander, David M.] Univ Calif Berkeley, Dept Mech Engn, Berkeley, CA 94720 USA. [Negrete-Pincetic, Matias] Univ Calif Berkeley, Dept EECS, Berkeley, CA USA. [Negrete-Pincetic, Matias] Pontificia Univ Catolica Chile, Dept Elect Engn, Santiago, Chile. [Stewart, Emma M.] Lawrence Berkeley Natl Lab, Environm Energy Technol Div, Berkeley, CA USA. [Callaway, Duncan S.] Univ Calif Berkeley, Energy & Resources Grp, Berkeley, CA USA. RP Arnold, DB (reprint author), Univ Calif Berkeley, Dept Mech Engn, Berkeley, CA 94720 USA. NR 16 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1944-9925 BN 978-1-4673-8040-9 J9 IEEE POW ENER SOC GE PY 2015 PG 5 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE3YU UT WOS:000371397503072 ER PT S AU Barrows, C Mai, T Hale, E Lopez, A Eurek, K AF Barrows, Clayton Mai, Trieu Hale, Elaine Lopez, Anthony Eurek, Kelly GP IEEE TI Considering Renewables in Capacity Expansion Models: Capturing Flexibility with Hourly Dispatch SO 2015 IEEE POWER & ENERGY SOCIETY GENERAL MEETING SE IEEE Power and Energy Society General Meeting PESGM LA English DT Proceedings Paper CT General Meeting of the IEEE-Power-and-Energy-Society CY JUL 26-30, 2015 CL Denver, CO SP IEEE Power & Energy Soc DE Capacity Expansion; Planning; Optimization; Renewable Energy AB The Resource Planning Model co-optimizes dispatch and capacity expansion using a simplified, chronological dispatch period representation and high-resolution resource, load and infrastructure data. The computational tractability of capacity expansion models depends on model simplifications. We demonstrate the effects of various dispatch period representations on model results using the Resource Planning Model. C1 [Barrows, Clayton; Mai, Trieu; Hale, Elaine; Lopez, Anthony; Eurek, Kelly] Natl Renewable Energy Lab, Golden, CO USA. RP Barrows, C (reprint author), Natl Renewable Energy Lab, Golden, CO USA. NR 15 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1944-9925 BN 978-1-4673-8040-9 J9 IEEE POW ENER SOC GE PY 2015 PG 5 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE3YU UT WOS:000371397504049 ER PT S AU Byrne, RH Silva-Monroy, CA AF Byrne, Raymond H. Silva-Monroy, Cesar A. GP IEEE TI Potential Revenue from Electrical Energy Storage in ERCOT: The Impact of Location and Recent Trends SO 2015 IEEE POWER & ENERGY SOCIETY GENERAL MEETING SE IEEE Power and Energy Society General Meeting PESGM LA English DT Proceedings Paper CT General Meeting of the IEEE-Power-and-Energy-Society CY JUL 26-30, 2015 CL Denver, CO SP IEEE Power & Energy Soc AB This paper outlines the calculations required to estimate the maximum potential revenue from participation in arbitrage and regulation in day-ahead markets using linear programming. Then, we use historical Electricity Reliability Council of Texas (ERCOT) data from 2011-2013 to evaluate the maximum potential revenue from a hypothetical 32 MWh, 8 MW system. We investigate the maximum potential revenue from two different scenarios: arbitrage only and arbitrage combined with regulation. This analysis was performed for each load zone over the same period to show the impact of location and to identify trends in the opportunities for energy storage. Our analysis shows that, with perfect foresight, participation in the regulation market would have produced more than twice the revenue compared to arbitrage in the ERCOT market in 2011-2013. Over the last three years, there has been a significant decrease in the potential revenue for an energy storage system. We also quantify the impact of location on potential revenue. C1 [Byrne, Raymond H.; Silva-Monroy, Cesar A.] Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. RP Byrne, RH (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. EM rhbyrne@sandia.gov; casilv@sandia.gov NR 15 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1944-9925 BN 978-1-4673-8040-9 J9 IEEE POW ENER SOC GE PY 2015 PG 5 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE3YU UT WOS:000371397502069 ER PT S AU Chakraborty, S Hoke, A Lundstrom, B AF Chakraborty, Sudipta Hoke, Anderson Lundstrom, Blake GP IEEE TI Evaluation of Multiple Inverter Volt-VAR Control Interactions with Realistic Grid Impedances SO 2015 IEEE POWER & ENERGY SOCIETY GENERAL MEETING SE IEEE Power and Energy Society General Meeting PESGM LA English DT Proceedings Paper CT General Meeting of the IEEE-Power-and-Energy-Society CY JUL 26-30, 2015 CL Denver, CO SP IEEE Power & Energy Soc DE Photovoltaic; inverters; power hardware-in-the-loop; volt-VAR control; interactions AB Integration of large numbers of distributed photovoltaic (PV) systems in electric distribution circuits often requires advanced functions (e. g. volt-VAR, frequency-Watt etc.). However, significant concerns have been raised about potential for PV inverters with such controls to interact with one another in a way that could cause grid instability. The lack of standardized inverter models makes it hard to simulate such transient interactions in software. Similarly it is very hard to test these dynamic inverter interactions in the laboratory. In this paper, unique Power Hardware-in-the-Loop (PHIL) techniques are presented to experimentally test for interactions of multiple PV inverters connected to multiple points-of-common-coupling (PCCs) with grid impedances between them. Sample test results are provided from simulation-only scenarios and PHIL testing. Though simulation results indicated possible harmful interactions between inverters' volt-VAR controllers; no such interactions were found in the limited hardware testing. C1 [Chakraborty, Sudipta; Hoke, Anderson; Lundstrom, Blake] Natl Renewable Energy Lab, Golden, CO USA. RP Chakraborty, S (reprint author), Natl Renewable Energy Lab, Golden, CO USA. EM Sudipta.Chakraborty@nrel.gov; Andy.Hoke@nrel.gov; Blake.Lundstrom@nrel.gov NR 17 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1944-9925 BN 978-1-4673-8040-9 J9 IEEE POW ENER SOC GE PY 2015 PG 5 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE3YU UT WOS:000371397500198 ER PT S AU Chen, YS Rice, M Glaesemann, K Huang, ZY AF Chen, Yousu Rice, Mark Glaesemann, Kurt Huang, Zhenyu GP IEEE TI Sub-second State Estimation Implementation and its Evaluation with Real Data SO 2015 IEEE POWER & ENERGY SOCIETY GENERAL MEETING SE IEEE Power and Energy Society General Meeting PESGM LA English DT Proceedings Paper CT General Meeting of the IEEE-Power-and-Energy-Society CY JUL 26-30, 2015 CL Denver, CO SP IEEE Power & Energy Soc DE State Estimation; High Performance Computing; Energy Management System; Power System Operation AB This paper describes the performance of a parallel state estimation (PSE) software implemented using advanced computing techniques. The developed code is able to solve state estimation of large-size, practical power systems within one second. Benchmarking tests against a commercial Energy Management System tool shows that the computational speed is more than 10 times faster with same level of accuracy. Benefits brought by the sub-second state estimation are also discussed in the aspects of improving robustness of state estimation, maintaining power system reliability, and enhancing market efficiency. C1 [Chen, Yousu] Pacific NW Natl Lab, Battelle Seattle Res Ctr, Seattle, WA 98109 USA. [Rice, Mark] Pacific NW Natl Lab, Elect Infrastruct, Richland, WA USA. [Glaesemann, Kurt] Pacific NW Natl Lab, Environm Mol Sci Lab, Richland, WA USA. RP Chen, YS (reprint author), Pacific NW Natl Lab, Battelle Seattle Res Ctr, Seattle, WA 98109 USA. EM yousu.chen@pnnl.gov; mark.rice@pnnl.gov; kurt.glaeseman@pnnl.gov; zhenyu.huang@pnnl.gov NR 19 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1944-9925 BN 978-1-4673-8040-9 J9 IEEE POW ENER SOC GE PY 2015 PG 5 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE3YU UT WOS:000371397501134 ER PT S AU Clark, K Miller, NW Shao, ML Pajic, S D'Aquila, R AF Clark, Kara Miller, Nicholas W. Shao, Miaolei Pajic, Slobodan D'Aquila, Robert GP IEEE TI Transient Stability of the US Western Interconnection with High Wind and Solar Generation SO 2015 IEEE POWER & ENERGY SOCIETY GENERAL MEETING SE IEEE Power and Energy Society General Meeting PESGM LA English DT Proceedings Paper CT General Meeting of the IEEE-Power-and-Energy-Society CY JUL 26-30, 2015 CL Denver, CO SP IEEE Power & Energy Soc DE Solar generation; transient stability; wind generation AB The addition of large amounts of wind and solar generation to bulk power systems that are traditionally subject to operating constraints set by transient limitations is the subject of considerable concern in the industry. The US Western Interconnection (WI) is expected to experience substantial additional growth in both wind and solar generation. These plants will, to some extent, displace large central station thermal generation, both coal and gas-fired, which have traditionally helped maintain stability. This paper reports the results of a study that investigated the transient stability of the WI with high penetrations of wind and solar generation. The main goals of this work were to (1) create a realistic, baseline model of the WI, (2) test selected transient stability events, (3) investigate the impact of large amounts of wind and solar generation, and (4) examine means to improve performance. C1 [Clark, Kara] Natl Renewable Energy Lab, Golden, CO USA. [Miller, Nicholas W.; Shao, Miaolei; Pajic, Slobodan; D'Aquila, Robert] GE Energy Consulting, Schenectady, NY USA. RP Clark, K (reprint author), Natl Renewable Energy Lab, Golden, CO USA. NR 13 TC 0 Z9 0 U1 1 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1944-9925 BN 978-1-4673-8040-9 J9 IEEE POW ENER SOC GE PY 2015 PG 5 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE3YU UT WOS:000371397501125 ER PT S AU Cui, MJ Ke, DP Sun, YZ Gan, D Zhang, J Hodge, BM AF Cui, Ming-Jian Ke, De-Ping Sun, Yuan-Zhang Gan, Di Zhang, Jie Hodge, Bri-Mathias GP IEEE TI A Scenario Generation Method for Wind Power Ramp Events Forecasting SO 2015 IEEE POWER & ENERGY SOCIETY GENERAL MEETING SE IEEE Power and Energy Society General Meeting PESGM LA English DT Proceedings Paper CT General Meeting of the IEEE-Power-and-Energy-Society CY JUL 26-30, 2015 CL Denver, CO SP IEEE Power & Energy Soc DE Genetic algorithm (GA); neural networks; stochastic process model; stochastic scenario generation; wind power ramp events; ramp forecasting AB Wind power ramp events (WPREs) have received increasing attention in recent years due to their significant impact on the reliability of power grid operations. In this paper, a novel WPRE forecasting method is proposed which is able to estimate the probability distributions of three important properties of the WPREs. To do so, a neural network (NN) is first proposed to model the wind power generation (WPG) as a stochastic process so that a number of scenarios of the future WPG can be generated (or predicted). Each possible scenario of the future WPG generated in this manner contains the ramping information, and the distributions of the designated WPRE properties can be stochastically derived based on the possible scenarios. Actual data from a wind power plant in the Bonneville Power Administration (BPA) was selected for testing the proposed ramp forecasting method. Results showed that the proposed method effectively forecasted the probability of ramp events. C1 [Cui, Ming-Jian; Ke, De-Ping; Sun, Yuan-Zhang; Gan, Di] Wuhan Univ, Sch Elect Engn, Wuhan 430072, Peoples R China. [Zhang, Jie; Hodge, Bri-Mathias] Natl Renewable Energy Lab, Golden, CO 80401 USA. RP Cui, MJ (reprint author), Wuhan Univ, Sch Elect Engn, Wuhan 430072, Peoples R China. EM mj_cui@whu.edu.cn; ee-dp.ke@connect.polyu.hk; yzsun@mail.tsinghua.edu.cn; hubeigandi@whu.edu.cn; jie.zhang@nrel.gov; bri.mathias.hodge@nrel.gov NR 14 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1944-9925 BN 978-1-4673-8040-9 J9 IEEE POW ENER SOC GE PY 2015 PG 5 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE3YU UT WOS:000371397500220 ER PT S AU Dall'Anese, E Dhople, SV Johnson, BB Giannakis, GB AF Dall'Anese, Emiliano Dhople, Sairaj V. Johnson, Brian B. Giannakis, Georgios B. GP IEEE TI Decentralized Optimal Dispatch of Photovoltaic Inverters in Residential Distribution Systems SO 2015 IEEE POWER & ENERGY SOCIETY GENERAL MEETING SE IEEE Power and Energy Society General Meeting PESGM LA English DT Proceedings Paper CT General Meeting of the IEEE-Power-and-Energy-Society CY JUL 26-30, 2015 CL Denver, CO SP IEEE Power & Energy Soc C1 [Dall'Anese, Emiliano; Johnson, Brian B.] Natl Renewable Energy Lab, Distributed Grid Integrat, Golden, CO 80401 USA. RP Dall'Anese, E (reprint author), Natl Renewable Energy Lab, Distributed Grid Integrat, Golden, CO 80401 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1944-9925 BN 978-1-4673-8040-9 J9 IEEE POW ENER SOC GE PY 2015 PG 1 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE3YU UT WOS:000371397502216 ER PT S AU Diakov, V Brinkman, G Denholm, P Jenkin, T Margolis, R AF Diakov, V. Brinkman, G. Denholm, P. Jenkin, T. Margolis, R. GP IEEE TI Renewable Generation Effect on Net Regional Energy Interchange SO 2015 IEEE POWER & ENERGY SOCIETY GENERAL MEETING SE IEEE Power and Energy Society General Meeting PESGM LA English DT Proceedings Paper CT General Meeting of the IEEE-Power-and-Energy-Society CY JUL 26-30, 2015 CL Denver, CO SP IEEE Power & Energy Soc DE renewable generation; transmission; PV and wind variability; large scale integration AB Using production-cost model (PLEXOS), we simulate the Western Interchange (WECC) at several levels of the yearly renewable energy (RE) generation, between 13% and 40% of the total load for the year. We look at the overall energy exchange between a region and the rest of the system (net interchange, NI), and find it useful to examine separately (i) (time-)variable and (ii) year-average components of the NI. Both contribute to interregional energy exchange, and are affected by wind and PV generation in the system. We find that net load variability (in relatively large portions of WECC) is the leading factor affecting the variable component of inter-regional energy exchange, and the effect is quantifiable: higher regional net load correlation with the rest of the WECC lowers net interchange variability. Further, as the power mix significantly varies between WECC regions, effects of 'flexibility import' (regions 'borrow' ramping capability) are also observed. C1 [Diakov, V.; Brinkman, G.; Denholm, P.; Jenkin, T.; Margolis, R.] Natl Renewable Energy Lab, Strateg Energy Anal Ctr, Golden, CO USA. RP Diakov, V (reprint author), Natl Renewable Energy Lab, Strateg Energy Anal Ctr, Golden, CO USA. EM victor.diakov@nrel.gov NR 4 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1944-9925 BN 978-1-4673-8040-9 J9 IEEE POW ENER SOC GE PY 2015 PG 4 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE3YU UT WOS:000371397502171 ER PT S AU Elizondo, MA Kalsi, K Calderon, CM Zhang, W AF Elizondo, Marcelo A. Kalsi, Karanjit Calderon, Christian Moya Zhang, Wei GP IEEE TI Frequency Responsive Demand in US Western Power System Model SO 2015 IEEE POWER & ENERGY SOCIETY GENERAL MEETING SE IEEE Power and Energy Society General Meeting PESGM LA English DT Proceedings Paper CT General Meeting of the IEEE-Power-and-Energy-Society CY JUL 26-30, 2015 CL Denver, CO SP IEEE Power & Energy Soc DE Power system dynamics; power system control AB Frequency control from the demand side presents a novel and viable way to complement control by traditional generators. This paper presents practical guidelines for system operators to select gain settings for a proposed frequency-based load control strategy. Simulation tests in a large interconnected system model demonstrate the robustness to different values of control gains, and sensitivities to controller location and type of controlled end-use load. The controller was implemented as a user defined model in the PowerWorld software and the controller's performance was tested on the Western Electricity Coordinating Council (WECC) system model. C1 [Elizondo, Marcelo A.; Kalsi, Karanjit] Pacific NW Natl Lab, Elect Infrastruct Grp, Seattle, WA USA. [Calderon, Christian Moya; Zhang, Wei] Ohio State Univ, Dept Elect & Comp Engn, Columbus, OH 43210 USA. RP Elizondo, MA (reprint author), Pacific NW Natl Lab, Elect Infrastruct Grp, Seattle, WA USA. NR 8 TC 0 Z9 0 U1 1 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1944-9925 BN 978-1-4673-8040-9 J9 IEEE POW ENER SOC GE PY 2015 PG 5 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE3YU UT WOS:000371397503047 ER PT S AU Farantatos, E Del Rosso, A Bhatt, N Sun, K Liu, YL Min, L Jing, CY Ning, JW Parashar, M AF Farantatos, Evangelos Del Rosso, Alberto Bhatt, Navin Sun, Kai Liu, Yilu Min, Liang Jing, Chaoyang Ning, Jiawei Parashar, Manu GP IEEE TI A Hybrid Framework for Online Dynamic Security Assessment Combining High Performance Computing and Synchrophasor Measurements SO 2015 IEEE POWER & ENERGY SOCIETY GENERAL MEETING SE IEEE Power and Energy Society General Meeting PESGM LA English DT Proceedings Paper CT General Meeting of the IEEE-Power-and-Energy-Society CY JUL 26-30, 2015 CL Denver, CO SP IEEE Power & Energy Soc DE Angular Stability; Dynamic Security Assessment; High-Performance Computing; Synchrophasors; Transient Stability; Visualizations; Voltage Stability AB A hybrid simulation/measurement-based framework for online dynamic security assessment (DSA) is proposed in this work. It combines the strengths and features of simulation-based and measurement-based approaches to develop a tool that integrates the results and provides real-time situational awareness on available operating margins against major stability problems. High performance computing capability is suggested and used in the simulation-based engine, while synchrophasor measurements are used as the input to the measurement-based stability assessment algorithms. The proposed framework is expected to provide solid foundation for new generation of real-time DSA tools that are needed for operators to assess in real-time the system's dynamic performance and operational security risk. C1 [Farantatos, Evangelos; Del Rosso, Alberto; Bhatt, Navin] EPRI, Palo Alto, CA USA. [Sun, Kai; Liu, Yilu] Univ Tennessee, Knoxville, TN USA. [Min, Liang] Lawrence Livermore Natl Lab, Livermore, CA USA. [Jing, Chaoyang] EMIT, Los Angeles, CA USA. [Ning, Jiawei; Parashar, Manu] Alstom Grid, Redmond, WA USA. RP Farantatos, E (reprint author), EPRI, Palo Alto, CA USA. EM efarantatos@epri.com; adelrosso@epri.com; nbhatt@epri.com; kaisun@utk.edu; liu@utk.edu; min2@llnl.gov; c.jing@myemit.com; jiawei-alex.ning@alstom.com; manu.parashar@alstom.com RI Sun, Kai/P-8613-2016 NR 7 TC 0 Z9 0 U1 1 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1944-9925 BN 978-1-4673-8040-9 J9 IEEE POW ENER SOC GE PY 2015 PG 5 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE3YU UT WOS:000371397504052 ER PT S AU Follum, J Pierre, J AF Follum, Jim Pierre, John GP IEEE TI Time-Localization of Forced Oscillations in Power Systems SO 2015 IEEE POWER & ENERGY SOCIETY GENERAL MEETING SE IEEE Power and Energy Society General Meeting PESGM LA English DT Proceedings Paper CT General Meeting of the IEEE-Power-and-Energy-Society CY JUL 26-30, 2015 CL Denver, CO SP IEEE Power & Energy Soc AB In power systems forced oscillations occur, and identification of these oscillations is important for the proper operation of the system. Two of the parameters of interest in analyzing and addressing forced oscillations are the starting and ending points. To obtain estimates of these parameters, this paper proposes a time-localization algorithm based on the geometric analysis of the sample cross-correlation between the measured data and a complex sinusoid at the frequency of the forced oscillation. Results from simulated and measured synchrophasor data demonstrate the algorithm's ability to accurately estimate the starting and ending points of forced oscillations. C1 [Follum, Jim] Pacific NW Natl Lab, Richland, WA 99352 USA. [Pierre, John] Univ Wyoming, Dept Elect & Comp Engn, Laramie, WY 82071 USA. RP Follum, J (reprint author), Pacific NW Natl Lab, Richland, WA 99352 USA. EM james.follum@pnnl.gov; pierre@uwyo.edu NR 14 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1944-9925 BN 978-1-4673-8040-9 J9 IEEE POW ENER SOC GE PY 2015 PG 5 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE3YU UT WOS:000371397502053 ER PT S AU Garcia, M Giani, A Baldick, R AF Garcia, Manuel Giani, Annarita Baldick, Ross GP IEEE TI Smart Grid Data Integrity Attacks: Observable Islands SO 2015 IEEE POWER & ENERGY SOCIETY GENERAL MEETING SE IEEE Power and Energy Society General Meeting PESGM LA English DT Proceedings Paper CT General Meeting of the IEEE-Power-and-Energy-Society CY JUL 26-30, 2015 CL Denver, CO SP IEEE Power & Energy Soc DE Cyber security; data integrity attack; observable island; topology estimation ID DATA INJECTION ATTACKS; STATE ESTIMATION; POWER GRIDS AB Unobservable data integrity attacks are coordinated cyber attacks on power meter readings that are undetectable by any bad data detection algorithm. Counter measures against data integrity attacks have been extensively studied in the context of observable islands; however, the concept of observable islands has only been introduced for a specific type of attack known as the power injection attack which compromises only power injection meters and power flow meters. This manuscript introduces the concept of observable islands to a recently identified type of data integrity attack that may also compromise breaker status meters. We call this type of attack a General Data Integrity attack (GDI attack). The results presented here allow for observable island based PMU placement countermeasures, initially developed for power injection attacks, to be applied to GDI attacks. An example shows that these observable islands are prominent when using both linear state estimators and non-linear state estimators. C1 [Garcia, Manuel; Giani, Annarita] Los Alamos Natl Lab, Los Alamos, NM USA. [Baldick, Ross] Univ Texas Austin, Austin, TX 78712 USA. RP Garcia, M (reprint author), Los Alamos Natl Lab, Los Alamos, NM USA. EM mgarcia723@lanl.gov; annarita@lanl.gov; baldick@ece.utexas.edu NR 13 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1944-9925 BN 978-1-4673-8040-9 J9 IEEE POW ENER SOC GE PY 2015 PG 5 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE3YU UT WOS:000371397502218 ER PT S AU Gurrala, G Dimitrovski, A Sreekanth, P Simunovic, S Starke, M Sun, K AF Gurrala, Gurunath Dimitrovski, Aleksandar Sreekanth, Pannala Simunovic, Srdjan Starke, Michael Sun, Kai GP IEEE TI Application of Adomian Decomposition for Multi-Machine Power System Simulation SO 2015 IEEE POWER & ENERGY SOCIETY GENERAL MEETING SE IEEE Power and Energy Society General Meeting PESGM LA English DT Proceedings Paper CT General Meeting of the IEEE-Power-and-Energy-Society CY JUL 26-30, 2015 CL Denver, CO SP IEEE Power & Energy Soc DE Adomian Decomposition; power system dynamics; transient stability ID TRANSIENT STABILITY SIMULATION; TIME-DOMAIN SIMULATION AB In this paper, the merits of Adomian Decomposition Method (ADM) have been investigated for the time domain simulation of multi-machine power systems. ADM is an analytical approximation method for the solution of linear, nonlinear, deterministic and stochastic operator equations. It approximates the nonlinearities in the equations using Adomian polynomial series and that can form a rapidly convergent sequence of analytic functions. We apply the ADM approach for simulation of differential algebraic equations representing the detailed multi-machine power system. The ADM approach has been applied on the widely used IEEE 3 generator 9 bus system and IEEE 10 generator 39 bus system for 3 - phi fault simulations. In our simulations we found that the ADM approach is faster than the standard trapezoidal time integration method for the comparable accuracy. C1 [Gurrala, Gurunath; Dimitrovski, Aleksandar; Sreekanth, Pannala; Simunovic, Srdjan; Starke, Michael] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. [Sun, Kai] Univ Tennessee, Dept EECS, Knoxville, TN 37996 USA. RP Gurrala, G (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RI Dimitrovski, Aleksandar/G-5897-2016 OI Dimitrovski, Aleksandar/0000-0001-9109-621X NR 23 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1944-9925 BN 978-1-4673-8040-9 J9 IEEE POW ENER SOC GE PY 2015 PG 5 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE3YU UT WOS:000371397504014 ER PT S AU Hansen, TM Palmintier, B Suryanarayanan, S Maciejewski, AA Siegel, HJ AF Hansen, Timothy M. Palmintier, Bryan Suryanarayanan, Siddharth Maciejewski, Anthony A. Siegel, Howard Jay GP IEEE TI Bus.py: A GridLAB-D Communication Interface for Smart Distribution Grid Simulations SO 2015 IEEE POWER & ENERGY SOCIETY GENERAL MEETING SE IEEE Power and Energy Society General Meeting PESGM LA English DT Proceedings Paper CT General Meeting of the IEEE-Power-and-Energy-Society CY JUL 26-30, 2015 CL Denver, CO SP IEEE Power & Energy Soc DE aggregator; communication interface; demand response; energy systems integration; GridLAB-D; simulation test bed ID GENETIC ALGORITHM SOLUTION AB As more Smart Grid technologies (e.g., distributed photovoltaic, spatially distributed electric vehicle charging) are integrated into distribution grids, static distribution simulations are no longer sufficient for performing modeling and analysis. GridLAB-D is an agent-based distribution system simulation environment that allows fine-grained end-user models, including geospatial and network topology detail. A problem exists in that, without outside intervention, once the GridLAB-D simulation begins execution, it will run to completion without allowing the real-time interaction of Smart Grid controls, such as home energy management systems and aggregator control. We address this lack of runtime interaction by designing a flexible communication interface, Bus.py (pronounced bus-dot-pie), that uses Python to pass messages between one or more GridLAB-D instances and a Smart Grid simulator. This work describes the design and implementation of Bus.py, discusses its usefulness in terms of some Smart Grid scenarios, and provides an example of an aggregator-based residential demand response system interacting with GridLAB-D through Bus.py. The small scale example demonstrates the validity of the interface and shows that an aggregator using said interface is able to control residential loads in GridLAB-D during runtime to cause a reduction in the peak load on the distribution system in (a) peak reduction and (b) time-of-use pricing cases. C1 [Hansen, Timothy M.; Palmintier, Bryan] Natl Renewable Energy Lab, Golden, CO 80401 USA. [Hansen, Timothy M.; Suryanarayanan, Siddharth; Maciejewski, Anthony A.; Siegel, Howard Jay] Colorado State Univ, Ft Collins, CO 80523 USA. RP Hansen, TM (reprint author), Natl Renewable Energy Lab, Golden, CO 80401 USA. EM tim.hansen@nrel.gov; bryanp@ieee.org; sid@colostate.edu; aam@colostate.edu; hj@colostate.edu NR 23 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1944-9925 BN 978-1-4673-8040-9 J9 IEEE POW ENER SOC GE PY 2015 PG 5 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE3YU UT WOS:000371397501141 ER PT S AU Hao, H Sun, YN Carroll, TE Somani, A AF Hao, He Sun, Yannan Carroll, Thomas E. Somani, Abhishek GP IEEE TI A Distributed Cooperative Power Allocation Method for Campus Buildings SO 2015 IEEE POWER & ENERGY SOCIETY GENERAL MEETING SE IEEE Power and Energy Society General Meeting PESGM LA English DT Proceedings Paper CT General Meeting of the IEEE-Power-and-Energy-Society CY JUL 26-30, 2015 CL Denver, CO SP IEEE Power & Energy Soc DE Building-to-grid; power allocation; commercial buildings; Nash bargaining theory; dual decomposition ID COMMERCIAL BUILDINGS; CONSENSUS AB We propose a coordination algorithm for cooperative power allocation among a collection of commercial buildings within a campus. We describe a typical commercial building Heating, Ventilation, and Air Conditioning (HVAC) system, and utilize Model Predictive Control (MPC) to characterize its power flexibility. The power allocation problem is formulated as a cooperative game using the Nash Bargaining Solution (NBS) concept, in which buildings cooperatively maximize the product of their utilities subject to their local flexibility constraints and a total power limit set by the campus coordinator. To solve the optimal allocation problem, a distributed protocol is designed using dual decomposition of the Nash bargaining problem. Numerical simulations are performed to demonstrate the efficacy of our proposed allocation method. C1 [Hao, He; Sun, Yannan; Carroll, Thomas E.; Somani, Abhishek] Pacific NW Natl Lab, POB 999, Richland, WA 99352 USA. RP Hao, H (reprint author), Pacific NW Natl Lab, POB 999, Richland, WA 99352 USA. EM He.Hao@pnnl.gov; Yannan.Sun@pnnl.gov; Thomas.Carroll@pnnl.gov; Abhishek.Somani@pnnl.gov NR 24 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1944-9925 BN 978-1-4673-8040-9 J9 IEEE POW ENER SOC GE PY 2015 PG 5 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE3YU UT WOS:000371397502159 ER PT S AU Holttinen, H Kiviluoma, J Pineda, I McCann, J Clancy, M Eriksen, PB Orths, A Millgan, M Wolfgang, O AF Holttinen, Hannele Kiviluoma, Juha Pineda, Ivan McCann, John Clancy, Matthew Eriksen, Peter Bone Orths, Antje Millgan, Michael Wolfgang, Ove GP IEEE TI Reduction of CO2 Emissions due to Wind Energy - thods and issues in estimating operational emission reductions SO 2015 IEEE POWER & ENERGY SOCIETY GENERAL MEETING SE IEEE Power and Energy Society General Meeting PESGM LA English DT Proceedings Paper CT General Meeting of the IEEE-Power-and-Energy-Society CY JUL 26-30, 2015 CL Denver, CO SP IEEE Power & Energy Soc DE Wind energy; Wind power generation; Fuels; Emissions; Power generation; Power system simulation; Power generation dispatch. Wind energy integration ID POWER; ELECTRICITY AB This paper presents ways of estimating CO2 reductions of wind power using different methodologies. Estimates based on historical data have more pitfalls in methodology than estimates based on dispatch simulations. Taking into account exchange of electricity with neighboring regions is challenging for all methods. Results for CO2 emission reductions are shown from several countries. Wind power will reduce emissions for about 0.3-0.4 MtCO(2)/MWh when replacing mainly gas and up to 0.7 MtCO(2)/MWh when replacing mainly coal powered generation. The paper focuses on CO2 emissions from power system operation phase, but long term impacts are shortly discussed. C1 [Holttinen, Hannele; Kiviluoma, Juha] VTT, Espoo, Finland. [Pineda, Ivan] EWEA, Brussels, Belgium. [McCann, John; Clancy, Matthew] SEAI, Dublin, Ireland. [Eriksen, Peter Bone; Orths, Antje] Energinet Dk, Fredericia, Denmark. [Millgan, Michael] NREL, Golden, CO USA. [Wolfgang, Ove] SINTEF, N-7034 Trondheim, Norway. RP Holttinen, H (reprint author), VTT, Espoo, Finland. EM Hannele.holttinen@vtt.fi NR 19 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1944-9925 BN 978-1-4673-8040-9 J9 IEEE POW ENER SOC GE PY 2015 PG 5 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE3YU UT WOS:000371397502206 ER PT S AU Hsu, P Muljadi, E Wu, ZP Gao, WZ AF Hsu, Ping Muljadi, Eduard Wu, Ziping Gao, Wenzhong GP IEEE TI Permanent Magnet Synchronous Condenser with Solid State Excitation SO 2015 IEEE POWER & ENERGY SOCIETY GENERAL MEETING SE IEEE Power and Energy Society General Meeting PESGM LA English DT Proceedings Paper CT General Meeting of the IEEE-Power-and-Energy-Society CY JUL 26-30, 2015 CL Denver, CO SP IEEE Power & Energy Soc DE Synchronous condenser; permanent magnet synchronous generator; reactive power control AB A synchronous condenser consists of a free-spinning wound-field synchronous generator and a field excitation controller. In this paper, we propose a synchronous generator that employs a permanent magnet synchronous generator (PMSG) instead of a wound-field machine. PMSGs have the advantages of higher efficiency and reliability. In the proposed configuration, the reactive power control is achieved by a voltage source converter connected in series with the PMSG and the grid. The converter varies the phase voltage of the PMSG so as to create the same effect of over or under excitation in a wound-field machine. The converter output voltage level controls the amount and the direction of the produced reactive power and the voltage's phase is kept in-phase with the grid voltage except a slight phase can be introduced so that some power can be drawn from the grid for maintaining the DC bus voltage level of the converter. Since the output voltage of the converter is only a fraction of the line voltage, its VA rating is only a fraction of the rating of the PMSG. The proposed scheme is shown to be effective by computer simulation. C1 [Hsu, Ping] San Jose State Univ, San Jose, CA 95192 USA. [Muljadi, Eduard] Natl Renewable Energy Lab, Golden, CO USA. [Wu, Ziping; Gao, Wenzhong] Univ Denver, Denver, CO 80208 USA. RP Hsu, P (reprint author), San Jose State Univ, San Jose, CA 95192 USA. EM ping.hsu@sjsu.edu NR 5 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1944-9925 BN 978-1-4673-8040-9 J9 IEEE POW ENER SOC GE PY 2015 PG 5 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE3YU UT WOS:000371397503136 ER PT S AU Huang, WH Sun, K Qi, JJ Xu, Y AF Huang, Weihong Sun, Kai Qi, Junjian Xu, Yan GP IEEE TI Voronoi Diagram Based Optimization of Dynamic Reactive Power Sources SO 2015 IEEE POWER & ENERGY SOCIETY GENERAL MEETING SE IEEE Power and Energy Society General Meeting PESGM LA English DT Proceedings Paper CT General Meeting of the IEEE-Power-and-Energy-Society CY JUL 26-30, 2015 CL Denver, CO SP IEEE Power & Energy Soc DE dynamic var support; FIDVR; nonlinear optimization; Voronoi Diagram AB Dynamic var sources can effectively mitigate fault-induced delayed voltage recovery (FIDVR) issues or even voltage collapse. This paper proposes a new approach to optimization of the sizes of dynamic var sources at candidate locations by a Voronoi diagram based algorithm. It first disperses sample points of potential solutions in a searching space, evaluates a cost function at each point by barycentric interpolation for the subspaces around the point, and then constructs a Voronoi diagram about cost function values over the entire space. Accordingly, the final optimal solution can be obtained. Case studies on the WSCC 9-bus system and NPCC 140-bus system have validated that the new approach can quickly identify the boundary of feasible solutions in searching space and converge to the global optimal solution. C1 [Huang, Weihong; Sun, Kai; Qi, Junjian] Univ Tennessee, Knoxville, TN USA. [Xu, Yan] Oak Ridge Natl Lab, Oak Ridge, TN USA. RP Huang, WH (reprint author), Univ Tennessee, Knoxville, TN USA. EM whuang12@utk.edu; kaisun@utk.edu; junjian.qi.2012@ieee.org; xuy3@ornl.gov RI Sun, Kai/P-8613-2016 NR 11 TC 0 Z9 0 U1 1 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1944-9925 BN 978-1-4673-8040-9 J9 IEEE POW ENER SOC GE PY 2015 PG 5 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE3YU UT WOS:000371397502182 ER PT S AU Huang, ZY Zhou, N Diao, RS Wang, SB Elbert, S Meng, D Lu, S AF Huang, Zhenyu Zhou, Ning Diao, Ruisheng Wang, Shaobu Elbert, Steve Meng, Da Lu, Shuai GP IEEE TI Capturing Real-Time Power System Dynamics: Opportunities and Challenges SO 2015 IEEE POWER & ENERGY SOCIETY GENERAL MEETING SE IEEE Power and Energy Society General Meeting PESGM LA English DT Proceedings Paper CT General Meeting of the IEEE-Power-and-Energy-Society CY JUL 26-30, 2015 CL Denver, CO SP IEEE Power & Energy Soc DE Dynamic State Estimation; High Performance Computing; Kalman Filter (KF); Phasor Measurement Unit (PMU); Power System Dynamics; and Smart Grid ID STATE ESTIMATION; PMU DATA AB The power grid evolves towards a new mix of generation and consumption that introduces new dynamic and stochastic behaviors. These emerging grid behaviors would invalidate the steady-state assumption in today's state estimation - an essential function for real-time power grid operation. This paper examines this steady-state assumption and identifies the need for estimating dynamic states. Supporting technologies are presented as well as a proposed formulation for estimating dynamic states. Metrics for evaluating methods for solving the dynamic state estimation problem are proposed, with example results to illustrate the use of these metrics. The overall objective of this paper is to provide a basis that more research on this topic can follow. C1 [Huang, Zhenyu; Diao, Ruisheng; Wang, Shaobu; Elbert, Steve; Meng, Da; Lu, Shuai] Pacific NW Natl Lab, Richland, WA 99352 USA. [Zhou, Ning] SUNY Binghamton, Binghamton, NY 13902 USA. RP Huang, ZY (reprint author), Pacific NW Natl Lab, Richland, WA 99352 USA. EM zhenyu.huang@pnnl.gov; ningzhou@binghamton.edu; ruisheng.diao@pnnl.gov; shaobu.wang@pnnl.gov; steve.elbert@pnnl.gov; da.meng@pnnl.gov; shuai.lu@pnnl.gov RI Elbert, Stephen/F-9019-2016 OI Elbert, Stephen/0000-0003-2258-8901 NR 13 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1944-9925 BN 978-1-4673-8040-9 J9 IEEE POW ENER SOC GE PY 2015 PG 5 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE3YU UT WOS:000371397503032 ER PT S AU Jiang, HG Zhang, YC Zhang, JJ Muljadi, E AF Jiang, Huaiguang Zhang, Yingchen Zhang, Jun Jason Muljadi, Eduard GP IEEE TI PMU-Aided Voltage Security Assessment for a Wind Power Plant SO 2015 IEEE POWER & ENERGY SOCIETY GENERAL MEETING SE IEEE Power and Energy Society General Meeting PESGM LA English DT Proceedings Paper CT General Meeting of the IEEE-Power-and-Energy-Society CY JUL 26-30, 2015 CL Denver, CO SP IEEE Power & Energy Soc DE Power system; phasor measurement unit; fault disturbance recorder; wind power plant; voltage security ID STEADY-STATE; STABILITY ANALYSIS; ENHANCEMENT; COLLAPSE AB Because wind power penetration levels in electric power systems are continuously increasing, voltage stability is a critical issue for maintaining power system security and operation. The traditional methods to analyze voltage stability can be classified into two categories: dynamic and steady-state. Dynamic analysis relies on time-domain simulations of faults at different locations; however, this method needs to exhaust faults at all locations to find the security region for voltage at a single bus. With the widely located phasor measurement units (PMUs), the Thevenin equivalent matrix can be calculated by the voltage and current information collected by the PMUs. This paper proposes a method based on a Thevenin equivalent matrix to identify system locations that will have the greatest impact on the voltage at the wind power plant's point of interconnection. The number of dynamic voltage stability analysis runs is greatly reduced by using the proposed method. The numerical results demonstrate the feasibility, effectiveness, and robustness of the proposed approach for voltage security assessment for a wind power plant. C1 [Jiang, Huaiguang; Zhang, Jun Jason] Univ Denver, Dept Elect & Comp Engn, Denver, CO 80210 USA. [Zhang, Yingchen; Muljadi, Eduard] Natl Renewable Energy Lab, Golden, CO 80401 USA. RP Jiang, HG (reprint author), Univ Denver, Dept Elect & Comp Engn, Denver, CO 80210 USA. NR 15 TC 0 Z9 0 U1 1 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1944-9925 BN 978-1-4673-8040-9 J9 IEEE POW ENER SOC GE PY 2015 PG 5 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE3YU UT WOS:000371397502193 ER PT S AU Jin, S Botterud, A Ryan, S AF Jin, Shan Botterud, Audun Ryan, Sarah GP IEEE TI Temporal Versus Stochastic Granularity in Thermal Generation Capacity Planning With Wind Power SO 2015 IEEE POWER & ENERGY SOCIETY GENERAL MEETING SE IEEE Power and Energy Society General Meeting PESGM LA English DT Proceedings Paper CT General Meeting of the IEEE-Power-and-Energy-Society CY JUL 26-30, 2015 CL Denver, CO SP IEEE Power & Energy Soc C1 [Botterud, Audun] Argonne Natl Lab, Div Energy Syst, Argonne, IL 60439 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1944-9925 BN 978-1-4673-8040-9 J9 IEEE POW ENER SOC GE PY 2015 PG 1 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE3YU UT WOS:000371397503207 ER PT S AU Johnson, BJ Starke, MR Dimitrovski, AD AF Johnson, Brandon J. Starke, Michael R. Dimitrovski, Aleksandar D. GP IEEE TI Examining the Potential Impact of Plug-In Electric Vehicles on Residential Sector Power Demand SO 2015 IEEE POWER & ENERGY SOCIETY GENERAL MEETING SE IEEE Power and Energy Society General Meeting PESGM LA English DT Proceedings Paper CT General Meeting of the IEEE-Power-and-Energy-Society CY JUL 26-30, 2015 CL Denver, CO SP IEEE Power & Energy Soc DE Occupant behavior modeling; Markov chains; Plug-in electric vehicle modeling; Residential power demand AB This paper presents a dynamic simulation tool for examining the future impact of plug-in electric vehicles (PEVs) on residential sector power demand. First, the modeling approach used during the development of this tool is described. Markov chain based occupant behavior models developed using data gathered by the U. S. Census Bureau in the American Time Use Survey (ATUS) are used in conjunction with models of the most common residential loads to estimate residential demand on a one-minute time scale. Next, a detailed explanation of the methodology used to model PEV use and charging is given. Simulation results showing the differences in residential power demand, both with and without PEVs present in the system, are shown. Finally, future work will involve using these simulation results to conduct various probabilistic load flow studies. C1 [Johnson, Brandon J.] Elect Power Res Inst, Knoxville, TN USA. [Starke, Michael R.; Dimitrovski, Aleksandar D.] Oak Ridge Natl Lab, Oak Ridge, TN USA. RP Johnson, BJ (reprint author), Elect Power Res Inst, Knoxville, TN USA. RI Dimitrovski, Aleksandar/G-5897-2016 OI Dimitrovski, Aleksandar/0000-0001-9109-621X NR 11 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1944-9925 BN 978-1-4673-8040-9 J9 IEEE POW ENER SOC GE PY 2015 PG 5 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE3YU UT WOS:000371397501176 ER PT S AU Juul, F Negrete-Pincetic, M MacDonald, J Callaway, D AF Juul, Frederik Negrete-Pincetic, Matias MacDonald, Jason Callaway, Duncan GP IEEE TI Real-time Scheduling of Electric Vehicles for Ancillary Services SO 2015 IEEE POWER & ENERGY SOCIETY GENERAL MEETING SE IEEE Power and Energy Society General Meeting PESGM LA English DT Proceedings Paper CT General Meeting of the IEEE-Power-and-Energy-Society CY JUL 26-30, 2015 CL Denver, CO SP IEEE Power & Energy Soc DE Electric Vehicles; Resource Scheduling; Ancillary Services Market; Vehicle to Grid Control AB This work is part of a project that aims to demonstrate the concept of Vehicle-to-Grid (V2G) with an operational fleet. A fleet of electric vehicles is operated with the objective of providing regulation services to the grid. The focus of this paper is on the real-time operation of the fleet. Specifically, given an optimal trajectory for the vehicle state of charge, schemes for distributing the regulation power commands among the vehicles are tested. A scheme based on a convex optimization problem is proposed. Several numerical illustrations and simulations show the effectiveness of the scheme respect to common scheduling heuristics in terms of accuracy. C1 [Juul, Frederik; Negrete-Pincetic, Matias; Callaway, Duncan] Univ Calif Berkeley, Energy Resources Grp, Berkeley, CA 94720 USA. [Negrete-Pincetic, Matias] Pontificia Univ Catolica Chile, Dept Elect Engn, Santiago, Chile. [MacDonald, Jason] Lawrence Berkeley Natl Lab, Berkeley, CA USA. RP Juul, F (reprint author), Univ Calif Berkeley, Energy Resources Grp, Berkeley, CA 94720 USA. NR 11 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1944-9925 BN 978-1-4673-8040-9 J9 IEEE POW ENER SOC GE PY 2015 PG 5 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE3YU UT WOS:000371397502018 ER PT S AU Ke, XD Lu, N Wu, D Kintner-Meyer, M AF Ke, Xinda Lu, Ning Wu, Di Kintner-Meyer, Michael GP IEEE TI A Modified Priority List-Based MILP Method for Solving Large-Scale Unit Commitment Problems SO 2015 IEEE POWER & ENERGY SOCIETY GENERAL MEETING SE IEEE Power and Energy Society General Meeting PESGM LA English DT Proceedings Paper CT General Meeting of the IEEE-Power-and-Energy-Society CY JUL 26-30, 2015 CL Denver, CO SP IEEE Power & Energy Soc DE Mixed integer linear programming; power system scheduling; priority list method; unit commitment ID CONSTRAINTS AB This paper presents a two-step modified priority list (MPL) based mixed integer linear programming (MILP) method for improving the computational speed of unit commitment (UC) programs while preserving optimality. In the first step, the heuristics of UC results for a given generation fleet are investigated to develop the MPL. A subset of the generators are determined to be online (committed) or offline (uncommitted) within a planning period (e.g., a week), based on the demand curve and generator priority list. Then, for generators whose on/off status is predetermined, the corresponding binary variables are removed from the MILP solving process. After this simplification, the remaining problem can be solved much faster using an off-the-shelf MILP solver, based on the branch-and-bound algorithm. Scale factors are used to adjust the tradeoff between solution speed and level of optimality. Simulation results show that the proposed method can significantly speed up the large-scale UC problem with negligible compromise in optimality by selecting appropriate scale factors. C1 [Ke, Xinda; Lu, Ning] N Carolina State Univ, Dept Elect & Comp Engn, Raleigh, NC 27695 USA. [Wu, Di; Kintner-Meyer, Michael] Pacific NW Natl Lab, Energy & Environm Directorate, Richland, WA 99352 USA. RP Ke, XD (reprint author), N Carolina State Univ, Dept Elect & Comp Engn, Raleigh, NC 27695 USA. NR 13 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1944-9925 BN 978-1-4673-8040-9 J9 IEEE POW ENER SOC GE PY 2015 PG 5 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE3YU UT WOS:000371397504036 ER PT S AU Lee, C Liu, C Mehrotra, S Shahidehpour, M AF Lee, Changhyeok Liu, Cong Mehrotra, Sanjay Shahidehpour, Mohammad GP IEEE TI Modeling Transmission Line Constraints in Two-Stage Robust Unit Commitment Problem SO 2015 IEEE POWER & ENERGY SOCIETY GENERAL MEETING SE IEEE Power and Energy Society General Meeting PESGM LA English DT Proceedings Paper CT General Meeting of the IEEE-Power-and-Energy-Society CY JUL 26-30, 2015 CL Denver, CO SP IEEE Power & Energy Soc C1 [Liu, Cong] Argonne Natl Lab, Div Energy Syst, Argonne, IL 60439 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1944-9925 BN 978-1-4673-8040-9 J9 IEEE POW ENER SOC GE PY 2015 PG 1 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE3YU UT WOS:000371397501114 ER PT S AU Lei, Y Lu, YD Li, YL Liu, YL Tomsovic, K Wang, F AF Lei, Yin Lu, Yidan Li, Yalong Liu, Yilu Tomsovic, Kevin Wang, Fei GP IEEE TI A Preliminary Study of Building a Transmission Overlay for Regional US Power Grid SO 2015 IEEE POWER & ENERGY SOCIETY GENERAL MEETING SE IEEE Power and Energy Society General Meeting PESGM LA English DT Proceedings Paper CT General Meeting of the IEEE-Power-and-Energy-Society CY JUL 26-30, 2015 CL Denver, CO SP IEEE Power & Energy Soc DE Overlay grid; Renewable resources; HVDC transmission; Voltage source based converter; Multi-terminal HVDC AB Many European countries have taken steps toward a Supergrid in order to transmit large amount of intermittent and remote renewable energy over long distance to load centers. In the US, as the expected increase in renewable generation and electricity demand, similar problem arises. A potential solution is to upgrade the transmission system at a higher voltage by constructing a new overlay grid. This paper will first address basic requirements for such an overlay grid. Potential transmission technologies will also be discussed. A multi-terminal VSC HVDC model is developed in DSATools to implement the overlay grid and a test case on a regional NPCC system will be simulated. Another test system of entire US power grid, with three different interconnections tied together using back-to-back HVDC, is also introduced in this paper. Building an overlay system on top of this test case is ongoing, and will be discussed in future work. C1 [Lei, Yin; Lu, Yidan; Li, Yalong; Liu, Yilu; Tomsovic, Kevin; Wang, Fei] Univ Tennessee, Knoxville, TN USA. [Liu, Yilu; Wang, Fei] Oak Ridge Natl Lab, Oak Ridge, TN USA. RP Lei, Y (reprint author), Univ Tennessee, Knoxville, TN USA. EM ylei6@utk.edu; ylu16@utk.edu; liu@utk.edu NR 14 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1944-9925 BN 978-1-4673-8040-9 J9 IEEE POW ENER SOC GE PY 2015 PG 5 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE3YU UT WOS:000371397500159 ER PT S AU Lian, JM Sun, YN Marinovici, LD Kalsi, K AF Lian, Jianming Sun, Yannan Marinovici, Laurentiu D. Kalsi, Karanjit GP IEEE TI Improved Controller Design of Grid Friendly (TM) Appliances for Primary Frequency Response SO 2015 IEEE POWER & ENERGY SOCIETY GENERAL MEETING SE IEEE Power and Energy Society General Meeting PESGM LA English DT Proceedings Paper CT General Meeting of the IEEE-Power-and-Energy-Society CY JUL 26-30, 2015 CL Denver, CO SP IEEE Power & Energy Soc DE Grid Friendly (TM) Appliance; autonomous load control; frequency response; curtailing frequency threshold AB The Grid Friendly (TM) Appliance (GFA) controller, developed at Pacific Northwest National Laboratory, was originally designed to autonomously switch off appliances by detecting under-frequency events. In this paper, the feasibility of using the GFA controller to provide primary frequency response is investigated. In particular, the impacts of an important design parameter, i.e., curtailing frequency threshold, on the primary frequency response are carefully analyzed for different situations. In the normal situation, the current method of selecting curtailing frequency thresholds for GFAs is found to be insufficient to guarantee the desired performance especially when the frequency deviation is shallow. In the extreme situations, the power reduction of online GFAs could be so excessive that it can even impact the system frequency negatively. As the first step towards the efforts to make GFAs suitable for providing primary frequency response, the existing controller design is improved by modifying the strategy of selecting curtailing frequency thresholds to ensure the effectiveness of GFAs in the normal situation. C1 [Lian, Jianming; Sun, Yannan; Marinovici, Laurentiu D.; Kalsi, Karanjit] Pacific NW Natl Lab, 902 Battelle Blvd, Richland, WA 99352 USA. RP Lian, JM (reprint author), Pacific NW Natl Lab, 902 Battelle Blvd, Richland, WA 99352 USA. EM Jianming.Lian@pnnl.gov; Yannan.Sun@pnnl.gov; Laurentiu.Marinovici@pnnl.gov; Karanjit.Kalsi@pnnl.gov NR 5 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1944-9925 BN 978-1-4673-8040-9 J9 IEEE POW ENER SOC GE PY 2015 PG 5 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE3YU UT WOS:000371397503117 ER PT S AU Liu, GD Ceylan, O Xu, Y Tomsovic, K AF Liu, Guodong Ceylan, Oguzhan Xu, Yan Tomsovic, Kevin GP IEEE TI Optimal Voltage Regulation for Unbalanced Distribution Networks Considering Distributed Energy Resources SO 2015 IEEE POWER & ENERGY SOCIETY GENERAL MEETING SE IEEE Power and Energy Society General Meeting PESGM LA English DT Proceedings Paper CT General Meeting of the IEEE-Power-and-Energy-Society CY JUL 26-30, 2015 CL Denver, CO SP IEEE Power & Energy Soc DE Voltage regulation; sensitivity coefficients; linearization; distributed energy resource (DER); golden search method; unbalanced distribution network ID DISTRIBUTION POWER-FLOW; DISTRIBUTION-SYSTEMS; GENERATION AB With increasing penetration of distributed generation in the distribution networks (DN), the secure and optimal operation of DN has become an important concern. In this paper, an iterative quadratic constrained quadratic programming model to minimize voltage deviations and maximize distributed energy resource (DER) active power output in a three phase unbalanced distribution system is developed. The optimization model is based on the linearized sensitivity coefficients between controlled variables (e.g., node voltages) and control variables (e.g., real and reactive power injections of DERs). To avoid the oscillation of solution when it is close to the optimum, a golden search method is introduced to control the step size. Numerical simulations on modified IEEE 13 nodes test feeders show the efficiency of the proposed model. Compared to the results solved by heuristic search (harmony algorithm), the proposed model converges quickly to the global optimum. C1 [Liu, Guodong; Xu, Yan] Oak Ridge Natl Lab, Power & Energy Syst Grp, Oak Ridge, TN 37381 USA. [Ceylan, Oguzhan; Tomsovic, Kevin] Univ Tennessee, Dept Elect Engn & Comp Sci, Knoxville, TN 37996 USA. RP Liu, GD (reprint author), Oak Ridge Natl Lab, Power & Energy Syst Grp, Oak Ridge, TN 37381 USA. EM liug@ornl.gov; oceylan@utk.edu; xyu3@ornl.gov; tomsovic@tennessee.edu NR 18 TC 0 Z9 0 U1 1 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1944-9925 BN 978-1-4673-8040-9 J9 IEEE POW ENER SOC GE PY 2015 PG 5 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE3YU UT WOS:000371397503163 ER PT S AU Liu, Y Kou, GF Liu, YL Gracia, JR King, TJ AF Liu, Yong Kou, Gefei Liu, Yilu Gracia, Jose R. King, Thomas J., Jr. GP IEEE TI Design of a Large-scale Virtual Power Grid for Research Community SO 2015 IEEE POWER & ENERGY SOCIETY GENERAL MEETING SE IEEE Power and Energy Society General Meeting PESGM LA English DT Proceedings Paper CT General Meeting of the IEEE-Power-and-Energy-Society CY JUL 26-30, 2015 CL Denver, CO SP IEEE Power & Energy Soc DE Dynamics; Large-scale model; Power flow; Stability and control ID SYSTEMS; CONTROLLERS; ENERGY AB Due to security and liability concerns, the research community has limited access to realistic large-scale power grid models to test and validate new operation and control methodologies. It is also difficult for industry to evaluate the relative value of competing new tools without a common platform for comparison. This paper proposes to develop a large-scale virtual power grid model that retains basic features and represents future trends of major U.S. electric interconnections. The proposed model will include realistic power flow and dynamics information as well as a relevant geospatial distribution of assets. This model will be made widely available to the research community for various power system stability and control studies and can be used as a common platform for comparing the efficacies of various new technologies. C1 [Liu, Yong; Kou, Gefei; Liu, Yilu; King, Thomas J., Jr.] Univ Tennessee, Dept Elect Engn, Knoxville, TN USA. [Liu, Yilu; Gracia, Jose R.; King, Thomas J., Jr.] Oak Ridge Natl Lab, Power & Energy Syst Grp, Oak Ridge, TN USA. RP Liu, Y (reprint author), Univ Tennessee, Dept Elect Engn, Knoxville, TN USA. NR 19 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1944-9925 BN 978-1-4673-8040-9 J9 IEEE POW ENER SOC GE PY 2015 PG 5 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE3YU UT WOS:000371397504032 ER PT S AU Lundstrom, B Gotseff, P Giraldez, J Coddington, M AF Lundstrom, Blake Gotseff, Peter Giraldez, Julieta Coddington, Michael GP IEEE TI A High-Speed, Real-Time Visualization and State Estimation Platform for Monitoring and Control of Electric Distribution Systems: Implementation and Field Results SO 2015 IEEE POWER & ENERGY SOCIETY GENERAL MEETING SE IEEE Power and Energy Society General Meeting PESGM LA English DT Proceedings Paper CT General Meeting of the IEEE-Power-and-Energy-Society CY JUL 26-30, 2015 CL Denver, CO SP IEEE Power & Energy Soc DE distribution system; high penetration; monitoring; photovoltaic (PV); real-time; state estimation; visualization AB Continued deployment of renewable and distributed energy resources is fundamentally changing the way that electric distribution systems are controlled and operated; more sophisticated active system control and greater situational awareness are needed. Real-time measurements and distribution system state estimation (DSSE) techniques enable more sophisticated system control and, when combined with visualization applications, greater situational awareness. This paper presents a novel demonstration of a high-speed, real-time DSSE platform and related control and visualization functionalities, implemented using existing open-source software and distribution system monitoring hardware. Live scrolling strip charts of meter data and intuitive annotated map visualizations of the entire state (obtained via DSSE) of a real-world distribution circuit are shown. The DSSE implementation is validated to demonstrate provision of accurate voltage data. This platform allows for enhanced control and situational awareness using only a minimum quantity of distribution system measurement units and modest data and software infrastructure. C1 [Lundstrom, Blake; Gotseff, Peter; Giraldez, Julieta; Coddington, Michael] Natl Renewable Energy Lab, Golden, CO USA. RP Lundstrom, B (reprint author), Natl Renewable Energy Lab, Golden, CO USA. NR 34 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1944-9925 BN 978-1-4673-8040-9 J9 IEEE POW ENER SOC GE PY 2015 PG 5 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE3YU UT WOS:000371397501007 ER PT S AU Martinez, CA Eto, JH AF Martinez, Carlos A. Eto, Joseph H. GP IEEE TI Wide-Area Monitoring of the North American Power Grid: An Integrated Portfolio of Real-Time Reliability Tools SO 2015 IEEE POWER & ENERGY SOCIETY GENERAL MEETING SE IEEE Power and Energy Society General Meeting PESGM LA English DT Proceedings Paper CT General Meeting of the IEEE-Power-and-Energy-Society CY JUL 26-30, 2015 CL Denver, CO SP IEEE Power & Energy Soc DE Area Control Error (ACE); Automatic Reliability Reports (ARR); Consortium for Electric Reliability Technology Solutions (CERTS); Geo-graphic Multi-View Visualization; Intelligent Alarms (IA) AB An integrated portfolio of wide-area real-time reliability tools is addressing one of the major recommendations from the most recent blackouts in North America's Eastern and Western interconnections: The lack of common, simultaneous, adequate and accurate reliability information during major disturbances. The functional specifications for the tools were defined through guidance provided by NERC reliability Subcommittees and Reliability Coordinators addressing wide-area real operational reliability problems. The tools' intelligent alarms, multi-view, geo-graphic displays and automatic reliability reports enable Balancing Authorities and Reliability Coordinators to rapidly and jointly interpret and use consistently presented real-time data to monitor load-generation-frequency resources adequacy and grid health. The data and functional architectures are being adapted to make the tools useful for the integration of emergent dynamic distributed systems into the traditional centralized systems of today. The paper focus on the most intensively used tools, and illustrates how the tools are used in practice with five examples drawn from four interconnections. C1 [Martinez, Carlos A.] Adv Syst Researchers Inc, Energy Syst Res, Pasadena, CA USA. [Eto, Joseph H.] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Elect Markets & Policy Grp, Berkeley, CA 94720 USA. RP Martinez, CA (reprint author), Adv Syst Researchers Inc, Energy Syst Res, Pasadena, CA USA. EM cmartinez@asresearchers.com; jheto@lbl.gov NR 6 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1944-9925 BN 978-1-4673-8040-9 J9 IEEE POW ENER SOC GE PY 2015 PG 5 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE3YU UT WOS:000371397501018 ER PT S AU Samaan, N Milligan, M Hunsaker, M Guo, T AF Samaan, Nader Milligan, Michael Hunsaker, Matt Guo, Tao GP IEEE TI Three-Stage Production Cost Modeling Approach for Evaluating the Benefits of Intra-Hour Scheduling between Balancing Authorities SO 2015 IEEE POWER & ENERGY SOCIETY GENERAL MEETING SE IEEE Power and Energy Society General Meeting PESGM LA English DT Proceedings Paper CT General Meeting of the IEEE-Power-and-Energy-Society CY JUL 26-30, 2015 CL Denver, CO SP IEEE Power & Energy Soc DE Balancing authorities; economic dispatch; intrahour scheduling; unit commitment; production cost modeling AB This paper introduces a production cost modeling approach for evaluating the benefits of intra-hour scheduling among Balancing Authorities (BAs). System operation is modeled in a three-stage sequential manner: day ahead (DA). hour ahead (HA). real time (RT). In addition to contingency reserve, each BA will need to carry out "up" and "down" load following and regulation reserve capacity requirements in the DA and HA time frames. In the RT simulation, only contingency and regulation reserves are carried out as load following is deployed. To model current RT operation with hourly schedules, a new constraint was introduced to force each BA net exchange schedule deviation from HA schedules to be within North American Electric Reliability Corporation (NERC) area control error (ACE) limits. Case studies that investigate the benefits of moving from hourly exchange schedules between Western Electricity Coordinating Council (WECC) BAs into 10-minute exchange schedules under two different levels of wind and solar penetration (11% and 33%) are presented. C1 [Samaan, Nader] PNNL, Richland, WA USA. [Milligan, Michael] NREL, Golden, CO USA. [Hunsaker, Matt] WECC, Salt Lake City, UT USA. [Guo, Tao] Energy Exemplar, Roseville, CA USA. RP Samaan, N (reprint author), PNNL, Richland, WA USA. EM nader.samaan@pnnl.gov; michael.milligan@nrel.gov; mhunsaker@wecc.biz; tao.guo@energyexemplar.com NR 10 TC 0 Z9 0 U1 1 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1944-9925 BN 978-1-4673-8040-9 J9 IEEE POW ENER SOC GE PY 2015 PG 5 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE3YU UT WOS:000371397504114 ER PT S AU Seuss, J Reno, MJ Broderick, RJ Grijalva, S AF Seuss, John Reno, Matthew J. Broderick, Robert J. Grijalva, Santiago GP IEEE TI Improving Distribution Network PV Hosting Capacity via Smart Inverter Reactive Power Support SO 2015 IEEE POWER & ENERGY SOCIETY GENERAL MEETING SE IEEE Power and Energy Society General Meeting PESGM LA English DT Proceedings Paper CT General Meeting of the IEEE-Power-and-Energy-Society CY JUL 26-30, 2015 CL Denver, CO SP IEEE Power & Energy Soc DE photovoltaic systems; reactive power control; voltage control AB Many utilities today have a large number of interconnection requests for new PV installations on their distribution networks. Interconnections should be approved in a timely manner but without compromising network reliability. It is thus important to know a network's PV hosting capacity, which defines the upper bound of PV sizes that pose no risk to the network. This paper investigates how implementing reactive power control on the PV inverter impacts the PV hosting capacity of a distribution network. A local Volt-Var droop control is used and simulations are performed in OpenDSS and Matlab. Multiple feeders are tested and it is found that the control greatly improves the overall hosting capacity of the feeder as well as the locational hosting capacity of most voltage constrained buses. C1 [Seuss, John; Reno, Matthew J.; Grijalva, Santiago] Georgia Inst Technol, Atlanta, GA 30332 USA. [Reno, Matthew J.; Broderick, Robert J.] Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Seuss, J (reprint author), Georgia Inst Technol, Atlanta, GA 30332 USA. NR 18 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1944-9925 BN 978-1-4673-8040-9 J9 IEEE POW ENER SOC GE PY 2015 PG 5 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE3YU UT WOS:000371397503209 ER PT S AU Stewart, EM Kiliccote, S Arnold, D von Meier, A Arghandeh, R AF Stewart, E. M. Kiliccote, S. Arnold, D. von Meier, A. Arghandeh, R. GP IEEE TI Accuracy and Validation of Measured and Modeled Data for Distributed PV Interconnection and Control SO 2015 IEEE POWER & ENERGY SOCIETY GENERAL MEETING SE IEEE Power and Energy Society General Meeting PESGM LA English DT Proceedings Paper CT General Meeting of the IEEE-Power-and-Energy-Society CY JUL 26-30, 2015 CL Denver, CO SP IEEE Power & Energy Soc DE Distribution; Measurement Standards Photovoltaic; Validation; Simulation Tools ID DESIGN; TOOLS AB The distribution grid is changing to become an active resource with complex modeling needs. The new active distribution grid will, within the next ten years, contain a complex mix of load, generation, storage and automated resources all operating with different objectives on different time scales from each other and requiring detailed analysis. Electrical analysis tools that are used to perform capacity and stability studies have been used for transmission system planning for many years. In these tools, the distribution grid was considered a load and its details and physical components were not modeled. The increase in measured data sources can be utilized for better modeling, but also control of distributed energy resources (DER). The utilization of these sources and advanced modeling tools will require data management, and knowledgeable users. Each of these measurement and modeling devices have accuracy constraints, which will ultimately define their future ability to be planned and controlled. This paper discusses the importance of measured data accuracy for inverter control, interconnection and planning tools and proposes ranges of control accuracy needed to satisfy all concerns based on the present grid infrastructure. C1 [Stewart, E. M.; Kiliccote, S.] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Environm Energy Technol Div, Berkeley, CA 94720 USA. [Arnold, D.; von Meier, A.; Arghandeh, R.] Univ Calif Berkeley, Calif Inst Energy & Environm, Berkeley, CA 94720 USA. RP Stewart, EM (reprint author), Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Environm Energy Technol Div, Berkeley, CA 94720 USA. NR 20 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1944-9925 BN 978-1-4673-8040-9 J9 IEEE POW ENER SOC GE PY 2015 PG 5 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE3YU UT WOS:000371397503171 ER PT S AU Vlachopoulou, M Gosink, L Pulsipher, T Hafen, R Rounds, J Zhou, N Tong, JZ AF Vlachopoulou, Maria Gosink, Luke Pulsipher, Trenton Hafen, Ryan Rounds, Jeremiah Zhou, Ning Tong, Jianzhong GP IEEE TI Net Interchange Schedule Forecasting Using Bayesian Model Averaging SO 2015 IEEE POWER & ENERGY SOCIETY GENERAL MEETING SE IEEE Power and Energy Society General Meeting PESGM LA English DT Proceedings Paper CT General Meeting of the IEEE-Power-and-Energy-Society CY JUL 26-30, 2015 CL Denver, CO SP IEEE Power & Energy Soc DE Bayesian model averaging; forecasting; interchange schedule; prediction; time series ID REGRESSION AB The future power grid will need to incorporate systems and processes with a higher degree of variability and randomness due to the penetration of renewable energy resources and the increase of energy demand. Forecasting variables in a more uncertain environment poses new challenges and revisions of the existing forecasting methodologies will have to be made to maintain forecasting accuracy. This paper investigates an ensemble-based technique called Bayesian Model Averaging (BMA) to improve the performance of Net Interchange Schedule (NIS) forecasts. BMA is used to combine an ensemble of five diverse forecasting methods that each estimate NIS. The results, which examine performance for two separate years of real-world NIS data, demonstrate that BMA's aggregated forecasts reduces forecasting error by 30-55% in comparison to all individual prediction methods. This work illustrates a new possible mechanism for improving NIS forecasting accuracy, as well as other power grid system variables, and lays the foundation for future work on aggregate models that can balance computational cost with prediction accuracy. C1 [Vlachopoulou, Maria; Gosink, Luke; Pulsipher, Trenton; Hafen, Ryan] PNNL, Richland, WA 99354 USA. [Rounds, Jeremiah] Purdue Univ, W Lafayette, IN 47907 USA. [Zhou, Ning] SUNY Binghamton, Binghamton, NY USA. [Tong, Jianzhong] PJM, Valley Forge, PA USA. RP Vlachopoulou, M (reprint author), PNNL, Richland, WA 99354 USA. NR 11 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1944-9925 BN 978-1-4673-8040-9 J9 IEEE POW ENER SOC GE PY 2015 PG 5 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE3YU UT WOS:000371397500128 ER PT S AU Wan, Z Ahmed, A Husain, I Muljadi, E AF Wan, Zhao Ahmed, Adeeb Husain, Iqbal Muljadi, Eduard GP IEEE TI A Novel Transverse Flux Machine for Vehicle Traction Aplications SO 2015 IEEE POWER & ENERGY SOCIETY GENERAL MEETING SE IEEE Power and Energy Society General Meeting PESGM LA English DT Proceedings Paper CT General Meeting of the IEEE-Power-and-Energy-Society CY JUL 26-30, 2015 CL Denver, CO SP IEEE Power & Energy Soc DE Ferrites; Permanent Magnet Motors; Torque Density; Transverse Flux Motors ID DESIGN; MAGNETS AB A novel transverse flux machine topology for electric vehicle traction application using ferrite magnets is presented in this paper. The proposed transverse flux topology utilizes novel magnet arrangements in the rotor that are similar to Halbach-array to boost flux linkage; on the stator side, cores are alternately arranged around a pair of ring windings in each phase to make use of the entire rotor flux that eliminates end windings. Analytical design considerations and finite element methods are used for an optimized design of a scooter in-wheel motor. Simulation results from Finite Element Analysis (FEA) show the motor achieved comparable torque density to conventional rare-earth permanent magnet machines. This machine is a viable candidate for direct drive applications with low cost and high torque density. C1 [Wan, Zhao; Ahmed, Adeeb; Husain, Iqbal] N Carolina State Univ, Dept Elect & Comp Engn, Raleigh, NC 27695 USA. [Muljadi, Eduard] Natl Renewable Energy Lab, Golden, CO USA. RP Wan, Z (reprint author), N Carolina State Univ, Dept Elect & Comp Engn, Raleigh, NC 27695 USA. NR 11 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1944-9925 BN 978-1-4673-8040-9 J9 IEEE POW ENER SOC GE PY 2015 PG 5 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE3YU UT WOS:000371397503181 ER PT S AU Wang, XY Yue, M AF Wang, Xiaoyu Yue, Meng GP IEEE TI Capacity Specification for Hybrid Energy Storage System to Accommodate Fast PV Fluctuations SO 2015 IEEE POWER & ENERGY SOCIETY GENERAL MEETING SE IEEE Power and Energy Society General Meeting PESGM LA English DT Proceedings Paper CT General Meeting of the IEEE-Power-and-Energy-Society CY JUL 26-30, 2015 CL Denver, CO SP IEEE Power & Energy Soc DE Battery energy storage system; hybrid energy storage system; non-parametric probability density estimation; super-capacitor; PV power fluctuation AB To accommodate the fast power fluctuations associated with PV generation, a hybrid energy storage system (HESS) consisting of a battery energy storage system (BESS) and super-capacitor is evaluated in this paper. A probabilistic approach for determining the power capacity specification for the HESS is proposed. This method would allow the capacities of the BESS and super-capacitor to be properly designed to optimize the characteristics of high energy density of the BESS and high power density of the super-capacitor. Results show that the super-capacitor within the HESS helps to mitigate the high frequency fluctuations, which contributes to the extension of BESS lifetime. In addition, the super-capacitor helps to address the peaks in solar power fluctuations without the severe penalty of round trip losses associated with a BESS. The proposed approach has been simulated using real PV generation data from an existing PV power plant in Long Island, New York. C1 [Wang, Xiaoyu; Yue, Meng] Brookhaven Natl Lab, Sustainable Energy Technol Dept, Upton, NY 11973 USA. RP Wang, XY (reprint author), Brookhaven Natl Lab, Sustainable Energy Technol Dept, Upton, NY 11973 USA. EM xywang@bnl.gov; yuemeng@bnl.gov NR 20 TC 0 Z9 0 U1 1 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1944-9925 BN 978-1-4673-8040-9 J9 IEEE POW ENER SOC GE PY 2015 PG 5 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE3YU UT WOS:000371397502052 ER PT S AU Wu, D Jin, CL Balducci, P Kintner-Meyer, M AF Wu, Di Jin, Chunlian Balducci, Patrick Kintner-Meyer, Michael GP IEEE TI An Energy Storage Assessment: Using Optimal Control Strategies to Capture Multiple Services SO 2015 IEEE POWER & ENERGY SOCIETY GENERAL MEETING SE IEEE Power and Energy Society General Meeting PESGM LA English DT Proceedings Paper CT General Meeting of the IEEE-Power-and-Energy-Society CY JUL 26-30, 2015 CL Denver, CO SP IEEE Power & Energy Soc DE Battery; energy storage system; optimization; power system economics ID POWER APPLICATIONS; WIND POWER; TECHNOLOGIES; SYSTEMS AB This paper presents a methodology for evaluating benefits of battery storage for multiple grid applications, including energy arbitrage, balancing service, capacity value, distribution system equipment deferral, and outage mitigation. In the proposed method, at each hour, a look-ahead optimization is first formulated and solved to determine battery base operating point. The minute by minute simulation is then performed to simulate the actual battery operation. This methodology is used to assess energy storage alternatives in Puget Sound Energy System. Different battery storage candidates are simulated for a period of one year to assess different value streams and overall benefits, as part of a financial feasibility evaluation of battery storage projects. C1 [Wu, Di; Balducci, Patrick; Kintner-Meyer, Michael] Pacific NW Natl Lab, Richland, WA 99352 USA. [Jin, Chunlian] Elect Reliabil Council Texas, Austin, TX USA. RP Wu, D (reprint author), Pacific NW Natl Lab, Richland, WA 99352 USA. NR 12 TC 0 Z9 0 U1 1 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1944-9925 BN 978-1-4673-8040-9 J9 IEEE POW ENER SOC GE PY 2015 PG 5 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE3YU UT WOS:000371397500222 ER PT S AU Wu, HY Pratt, A Chakraborty, S AF Wu, Hongyu Pratt, Annabelle Chakraborty, Sudipta GP IEEE TI Stochastic Optimal Scheduling of Residential Appliances with Renewable Energy Sources SO 2015 IEEE POWER & ENERGY SOCIETY GENERAL MEETING SE IEEE Power and Energy Society General Meeting PESGM LA English DT Proceedings Paper CT General Meeting of the IEEE-Power-and-Energy-Society CY JUL 26-30, 2015 CL Denver, CO SP IEEE Power & Energy Soc DE Home energy management system; mixed integer linear programming; stochastic optimization; Monte Carlo simulation; renewable energy sources ID OPTIMIZATION; MODEL AB This paper proposes a stochastic, multi-objective optimization model within a Model Predictive Control (MPC) framework, to determine the optimal operational schedules of residential appliances operating in the presence of renewable energy source (RES). The objective function minimizes the weighted sum of discomfort, energy cost, total and peak electricity consumption, and carbon footprint. A heuristic method is developed for combining different objective components. The proposed stochastic model utilizes Monte Carlo simulation (MCS) for representing uncertainties in electricity price, outdoor temperature, RES generation, water usage, and non-controllable loads. The proposed model is solved using a mixed integer linear programming (MILP) solver and numerical results show the validity of the model. Case studies show the benefit of using the proposed optimization model. C1 [Wu, Hongyu; Pratt, Annabelle; Chakraborty, Sudipta] Natl Renewable Energy Lab, Golden, CO USA. RP Wu, HY (reprint author), Natl Renewable Energy Lab, Golden, CO USA. EM hongyu.wu@nrel.gov; annabelle.pratt@nrel.gov; sudipta.chakraborty@nrel.gov NR 15 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1944-9925 BN 978-1-4673-8040-9 J9 IEEE POW ENER SOC GE PY 2015 PG 5 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE3YU UT WOS:000371397504055 ER PT S AU Wu, HY Ela, E Krad, I Florita, A Zhang, J Hodge, BM Ibanez, E Gao, WZ AF Wu, Hongyu Ela, Erik Krad, Ibrahim Florita, Anthony Zhang, Jie Hodge, Bri-Mathias Ibanez, Eduardo Gao, Wenzhong GP IEEE TI An Assessment of the Impact of Stochastic Day-Ahead SCUC on Economic and Reliability Metrics at Multiple Timescales SO 2015 IEEE POWER & ENERGY SOCIETY GENERAL MEETING SE IEEE Power and Energy Society General Meeting PESGM LA English DT Proceedings Paper CT General Meeting of the IEEE-Power-and-Energy-Society CY JUL 26-30, 2015 CL Denver, CO SP IEEE Power & Energy Soc DE Area control error; multiple timescales; stochastic optimization; progressive hedging; security-constrained unit commitment ID UNIT COMMITMENT; WIND POWER; GENERATION AB This paper incorporates the stochastic day-ahead security-constrained unit commitment (DASCUC) within a multi-timescale, multi-scheduling application with commitment, dispatch, and automatic generation control. The stochastic DASCUC is solved using a progressive hedging algorithm with constrained ordinal optimization to accelerate the individual scenario solution. Sensitivity studies are performed in the RTS-96 system, and the results show how this new scheduling application would impact costs and reliability with a closer representation of timescales of system operations in practice. C1 [Wu, Hongyu; Ela, Erik; Krad, Ibrahim; Florita, Anthony; Zhang, Jie; Hodge, Bri-Mathias; Ibanez, Eduardo] Natl Renewable Energy Lab, Golden, CO USA. [Gao, Wenzhong] Univ Denver, Dept Elect & Comp Engn, Denver, CO USA. RP Wu, HY (reprint author), Natl Renewable Energy Lab, Golden, CO USA. EM Hongyu.wu@nrel.gov; Wenzhong.gao@du.edu NR 16 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1944-9925 BN 978-1-4673-8040-9 J9 IEEE POW ENER SOC GE PY 2015 PG 5 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE3YU UT WOS:000371397504018 ER PT S AU Wu, Z Hsu, P Muljadi, E Gao, W AF Wu, Z. Hsu, P. Muljadi, E. Gao, W. GP IEEE TI A Serially-Connected Compensator for Eliminating the Unbalanced Three-Phase Voltage Impact on Wind Turbine Generators SO 2015 IEEE POWER & ENERGY SOCIETY GENERAL MEETING SE IEEE Power and Energy Society General Meeting PESGM LA English DT Proceedings Paper CT General Meeting of the IEEE-Power-and-Energy-Society CY JUL 26-30, 2015 CL Denver, CO SP IEEE Power & Energy Soc DE unbalanced; unsymmetrical; wind turbine; renewable energy; renewable generation; doubly-fed induction generator; squirrel-cage induction generator; FAST model AB Untransposed transmission lines, unbalanced tap changer operations, and unbalanced loading in weak distribution lines can cause unbalanced-voltage conditions. The resulting unbalanced voltage at the point of interconnection affects proper gird integration and reduces the lifetime of wind turbines due to power oscillations, torque pulsations, mechanical stresses, energy losses, and uneven and overheating of the generator stator winding. This work investigates the dynamic impact of unbalanced voltage on the mechanical and electrical components of integrated Fatigue, Aerodynamics, Structures, and Turbulence (FAST) wind turbine generation systems (WTGs) of Type 1 (squirrel-cage induction generator) and Type 3 (doubly-fed induction generator). To alleviate this impact, a serially-connected compensator for a three-phase power line is proposed to balance the wind turbine-side voltage. Dynamic simulation studies are conducted in MATLAB/Simulink to compare the responses of these two types of wind turbine models under normal and unbalanced-voltage operation conditions and demonstrate the effectiveness of the proposed compensator. C1 [Wu, Z.; Gao, W.] Univ Denver, Denver, CO 80208 USA. [Hsu, P.] San Jose State Univ, San Jose, CA 95192 USA. [Muljadi, E.] Natl Renewable Energy Lab, Golden, CO USA. RP Wu, Z (reprint author), Univ Denver, Denver, CO 80208 USA. EM wzpbsb@du.edu; ping.hsu@sjsu.edu; eduard.muljadi@nrel.gov; wenzhong.gao@du.edu NR 17 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1944-9925 BN 978-1-4673-8040-9 J9 IEEE POW ENER SOC GE PY 2015 PG 5 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE3YU UT WOS:000371397504064 ER PT S AU Xu, Y Liu, CC Schneider, KP Ton, DT AF Xu, Yin Liu, Chen-Ching Schneider, Kevin P. Ton, Dan T. GP IEEE TI Toward a Resilient Distribution System SO 2015 IEEE POWER & ENERGY SOCIETY GENERAL MEETING SE IEEE Power and Energy Society General Meeting PESGM LA English DT Proceedings Paper CT General Meeting of the IEEE-Power-and-Energy-Society CY JUL 26-30, 2015 CL Denver, CO SP IEEE Power & Energy Soc DE Distribution system; resiliency; extreme event; service restoration; distribution automation; microgrid ID RESTORATION AB Resiliency with respect to extreme events, such as a major hurricane, is considered one of the key features of smart distribution systems by the U.S. Department of Energy (DOE). In this paper, approaches to resilient distribution systems are reviewed and analyzed. Three important measures to enhance resiliency, i.e., utilization of microgrids, distribution automation (DA), and vulnerability analysis, are discussed. A 4-feeder 1069-node test system with microgrids is simulated to demonstrate the feasibility of these measures. C1 [Xu, Yin; Liu, Chen-Ching] Washington State Univ, Sch Elect Engn & Comp Sci, Pullman, WA 99164 USA. [Schneider, Kevin P.] Pacific NW Natl Lab, Battelle Seattle Res Ctr, Seattle, WA USA. [Ton, Dan T.] US DOE, Off Elect Delivery & Energy Reliabil, Washington, DC 20585 USA. RP Xu, Y (reprint author), Washington State Univ, Sch Elect Engn & Comp Sci, Pullman, WA 99164 USA. EM yxu2@eecs.wsu.edu; liu@eecs.wsu.edu; kevin.schneider@pnnl.gov; dan.ton@hq.doe.gov NR 19 TC 0 Z9 0 U1 1 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1944-9925 BN 978-1-4673-8040-9 J9 IEEE POW ENER SOC GE PY 2015 PG 5 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE3YU UT WOS:000371397504027 ER PT S AU Yang, T Wu, D Sun, YN Lian, JM AF Yang, Tao Wu, Di Sun, Yannan Lian, Jianming GP IEEE TI Impacts of Time Delays on Distributed Algorithms for Economic Dispatch SO 2015 IEEE POWER & ENERGY SOCIETY GENERAL MEETING SE IEEE Power and Energy Society General Meeting PESGM LA English DT Proceedings Paper CT General Meeting of the IEEE-Power-and-Energy-Society CY JUL 26-30, 2015 CL Denver, CO SP IEEE Power & Energy Soc DE Consensus; distributed algorithm; economic dispatch; multi-agent systems; time delays ID COST CONSENSUS ALGORITHM; MULTIAGENT SYSTEMS; COORDINATION; TOPOLOGIES; AGENTS AB Economic dispatch problem (EDP) is an optimization problem with the objective to minimize the total generation cost subject to the power balance constraint and generator capacity limits. Typically, EDP is solved in a centralized manner, however, recently, several consensus-based algorithms have been proposed to solve EDP in a distributed manner. In these algorithms, it is assumed that information are exchanged through the perfect communication network. However time delays are ubiquitous in the communication network. This paper investigates impacts of communication time delays on a distributed algorithm. This algorithm has been tested by applying time delays to different types of information exchange. Several case studies are carried out to evaluate the effectiveness and performance of the algorithm in the presence of time delays in communication networks. It is found that time delays can negatively affect convergence rate, resulting in the algorithm either converging to an incorrect value or failing to converge altogether. C1 [Yang, Tao; Wu, Di; Sun, Yannan; Lian, Jianming] Pacific NW Natl Lab, 902 Battelle Blvd, Richland, WA 99352 USA. RP Yang, T (reprint author), Pacific NW Natl Lab, 902 Battelle Blvd, Richland, WA 99352 USA. EM Tao.Yang@pnnl.gov; Di.Wu@pnnl.gov; Yannan.Sun@pnnl.gov; Jianming.Lian@pnnl.gov NR 21 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1944-9925 BN 978-1-4673-8040-9 J9 IEEE POW ENER SOC GE PY 2015 PG 5 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE3YU UT WOS:000371397502137 ER PT S AU You, ST Zhu, L Liu, Y Liu, HS Liu, YL Shankar, M Robertson, R King, T AF You, Shutang Zhu, Lin Liu, Yong Liu, Hesen Liu, Yilu Shankar, Mallikarjun Robertson, Russell King, Tom GP IEEE TI A Survey on Next-generation Power Grid Data Architecture SO 2015 IEEE POWER & ENERGY SOCIETY GENERAL MEETING SE IEEE Power and Energy Society General Meeting PESGM LA English DT Proceedings Paper CT General Meeting of the IEEE-Power-and-Energy-Society CY JUL 26-30, 2015 CL Denver, CO SP IEEE Power & Energy Soc DE Smart grid; data architecture; survey; information system AB The operation and control of power grids will increasingly rely on data. A high-speed, reliable, flexible and secure data architecture is the prerequisite of the next-generation power grid. This paper summarizes the challenges in collecting and utilizing power grid data, and then provides reference data architecture for future power grids. Based on the data architecture deployment, related research on data architecture is reviewed and summarized in several categories including data measurement/actuation, data transmission, data service layer, data utilization, as well as two cross-cutting issues, interoperability and cyber security. Research gaps and future work are also presented. C1 [You, Shutang; Zhu, Lin; Liu, Yong; Liu, Hesen; Liu, Yilu; King, Tom] Univ Tennessee, Dept Elect Engn & Comp Sci, Knoxville, TN USA. [Liu, Yilu; Shankar, Mallikarjun; King, Tom] Oak Ridge Natl Lab, Oak Ridge, TN USA. [Robertson, Russell] Grid Protect Alliance, Chattanooga, TN USA. RP You, ST (reprint author), Univ Tennessee, Dept Elect Engn & Comp Sci, Knoxville, TN USA. NR 5 TC 0 Z9 0 U1 1 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1944-9925 BN 978-1-4673-8040-9 J9 IEEE POW ENER SOC GE PY 2015 PG 5 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE3YU UT WOS:000371397503087 ER PT S AU Young, M Dimitrovski, A Li, Z Liu, YL Patterson, R AF Young, Marcus Dimitrovski, Aleksander Li, Zhi Liu, Yilu Patterson, Russell GP IEEE TI Continously Variable Series Reactor: Impacts on Distance Protection using CCVTs SO 2015 IEEE POWER & ENERGY SOCIETY GENERAL MEETING SE IEEE Power and Energy Society General Meeting PESGM LA English DT Proceedings Paper CT General Meeting of the IEEE-Power-and-Energy-Society CY JUL 26-30, 2015 CL Denver, CO SP IEEE Power & Energy Soc DE Continuously Variable Series Reactor (CVSR); Magnetic Amplifier; Distance Protection; Capacitor Coupled Voltage Transformer (CCVT); Power System Simulation AB A continuously variable series reactor (CVSR) is a novel application of a well-known concept that provides continuous modulation of line reactance by controlling the magnetization in a ferromagnetic core. The target application is power flow control in meshed electric power systems. Modulation of the line impedance occurs by altering the bias of a dc winding to control the magnetization of the ferromagnetic core, thereby varying the reactance of the ac winding. Fault conditions can drive the CVSR outside of the control point in sub-cycle time and could affect distance protection along the controlled line. This study seeks to quantify such impacts using PSCAD (TM) simulations of a CVSR under fault conditions with CCVTs providing the line potential measurements. Impacts are observed through playback of the resulting waveforms into a distance relay. The results show that the interaction of the CVSR with CCVTs has minimal effect on distance protection reach. C1 [Young, Marcus; Dimitrovski, Aleksander; Li, Zhi; Liu, Yilu] Oak Ridge Natl Lab, Power & Energy Syst Grp, Oak Ridge, TN 37831 USA. [Patterson, Russell] Patterson Power Engn LLC, Chattanooga, TN USA. RP Young, M (reprint author), Oak Ridge Natl Lab, Power & Energy Syst Grp, Oak Ridge, TN 37831 USA. RI Dimitrovski, Aleksandar/G-5897-2016 OI Dimitrovski, Aleksandar/0000-0001-9109-621X NR 7 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1944-9925 BN 978-1-4673-8040-9 J9 IEEE POW ENER SOC GE PY 2015 PG 5 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE3YU UT WOS:000371397503150 ER PT S AU Yue, M Wang, XY AF Yue, Meng Wang, Xiaoyu GP IEEE TI Outage Data Collection and Parameter Estimation for an Improved Probabilistic Contigency Analysis SO 2015 IEEE POWER & ENERGY SOCIETY GENERAL MEETING SE IEEE Power and Energy Society General Meeting PESGM LA English DT Proceedings Paper CT General Meeting of the IEEE-Power-and-Energy-Society CY JUL 26-30, 2015 CL Denver, CO SP IEEE Power & Energy Soc DE Probabilistic contingency analysis; Pearson Chi-square test; data poolability; lognormal distribution AB Probabilistic risk assessment (PRA) techniques are increasingly being used in electric power industry applications for better coping with uncertainties over deterministic approaches. One application where PRA techniques can add value is data analysis for parameters such as outage frequency. Focusing on a probabilistic contingency analysis (PCA), this study examines the issue of obtaining a point estimate of outage statistics by lumping or pooling outage data records together from different sources. A Pearson Chi-square test is adopted to determine the poolability of data, and a lognormal distribution is used to model the data source variability and capture variations of operation and maintenance practices among different utilities. The distribution parameters representing outage frequencies and durations are calculated from the raw outage data. An improved PCA scheme based on the outcomes of this study is proposed and being implemented. C1 [Yue, Meng; Wang, Xiaoyu] Brookhaven Natl Lab, Dept Sustainable Energy Technol, Upton, NY 11973 USA. RP Yue, M (reprint author), Brookhaven Natl Lab, Dept Sustainable Energy Technol, Upton, NY 11973 USA. EM yuemeng@bnl.gov; xywang@bnl.gov NR 11 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1944-9925 BN 978-1-4673-8040-9 J9 IEEE POW ENER SOC GE PY 2015 PG 5 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE3YU UT WOS:000371397501175 ER PT S AU Zhang, J Hodge, BM Lu, SY Hamann, HF Lehman, B Simmons, J Campos, E Banunarayanan, V AF Zhang, Jie Hodge, Bri-Mathias Lu, Siyuan Hamann, Hendrik F. Lehman, Brad Simmons, Joseph Campos, Edwin Banunarayanan, Venkat GP IEEE TI Baseline and Target Values for PV Forecasts: Toward Improved Solar Power Forecasting SO 2015 IEEE POWER & ENERGY SOCIETY GENERAL MEETING SE IEEE Power and Energy Society General Meeting PESGM LA English DT Proceedings Paper CT General Meeting of the IEEE-Power-and-Energy-Society CY JUL 26-30, 2015 CL Denver, CO SP IEEE Power & Energy Soc DE grid integration; numerical weather prediction; operating reserve; ramp forecasting; solar power forecasting ID GRID INTEGRATION; PREDICTION; US AB Accurate solar power forecasting allows utilities to get the most out of the solar resources on their systems. To truly measure the improvements that any new solar forecasting methods can provide, it is important to first develop (or determine) baseline and target solar forecasting at different spatial and temporal scales. This paper aims to develop baseline and target values for solar forecasting metrics. These were informed by close collaboration with utility and independent system operator partners. The baseline values are established based on state-of-the-art numerical weather prediction models and persistence models. The target values are determined based on the reduction in the amount of reserves that must be held to accommodate the uncertainty of solar power output. C1 [Zhang, Jie; Hodge, Bri-Mathias] Natl Renewable Energy Lab, Golden, CO USA. [Lu, Siyuan; Hamann, Hendrik F.] IBM TJ Watson Res Ctr, Yorktown Hts, NY USA. [Lehman, Brad] Northeastern Univ, Boston, MA 02115 USA. [Simmons, Joseph] Univ Arizona, Tucson, AZ USA. [Campos, Edwin] Argonne Natl Lab, Lemont, IL USA. [Banunarayanan, Venkat] US DOE, Washington, DC 20585 USA. RP Zhang, J (reprint author), Natl Renewable Energy Lab, Golden, CO USA. NR 17 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1944-9925 BN 978-1-4673-8040-9 J9 IEEE POW ENER SOC GE PY 2015 PG 5 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE3YU UT WOS:000371397502158 ER PT S AU Zhao, JC Zhan, LW Liu, YL Qi, HR Garcia, JR Ewing, PD AF Zhao, Jiecheng Zhan, Lingwei Liu, Yilu Qi, Hairong Garcia, Jose R. Ewing, Paul D. GP IEEE TI Measurement Accuracy Limitation Analysis on Synchrophasors SO 2015 IEEE POWER & ENERGY SOCIETY GENERAL MEETING SE IEEE Power and Energy Society General Meeting PESGM LA English DT Proceedings Paper CT General Meeting of the IEEE-Power-and-Energy-Society CY JUL 26-30, 2015 CL Denver, CO SP IEEE Power & Energy Soc DE phasor measurement unit; wide area measurement system; measurement error AB This paper analyzes the theoretical accuracy limitation of synchrophasors measurements on phase angle and frequency of the power grid. Factors that cause the measurement error are analyzed, including error sources in the instruments and in the power grid signal. Different scenarios of these factors are evaluated according to the normal operation status of power grid measurement. Based on the evaluation and simulation, the errors of phase angle and frequency caused by each factor are calculated and discussed. C1 [Zhao, Jiecheng; Zhan, Lingwei; Liu, Yilu; Qi, Hairong] Univ Tennessee, Dept Elect Engn & Comp Sci, Knoxville, TN 37996 USA. [Garcia, Jose R.; Ewing, Paul D.] Oak Ridge Natl Lab, Oak Ridge, TN 37830 USA. RP Zhao, JC (reprint author), Univ Tennessee, Dept Elect Engn & Comp Sci, Knoxville, TN 37996 USA. EM jzhao27@utk.edu; lzhan@utk.edu; liu@utk.edu; hqi@utk.edu; graciajr@ornl.gov; ewingpd@ornl.gov NR 14 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1944-9925 BN 978-1-4673-8040-9 J9 IEEE POW ENER SOC GE PY 2015 PG 5 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE3YU UT WOS:000371397500090 ER PT S AU Zhou, N Meng, D Huang, ZY Welch, G AF Zhou, Ning Meng, Da Huang, Zhenyu Welch, Greg GP IEEE TI Dynamic State Estimation of a Synchronous Machine using PMU Data: A Comparative Study SO 2015 IEEE POWER & ENERGY SOCIETY GENERAL MEETING SE IEEE Power and Energy Society General Meeting PESGM LA English DT Proceedings Paper CT General Meeting of the IEEE-Power-and-Energy-Society CY JUL 26-30, 2015 CL Denver, CO SP IEEE Power & Energy Soc C1 [Zhou, Ning] SUNY Binghamton, Dept Elect Engn, Binghamton, NY 13902 USA. [Meng, Da; Huang, Zhenyu] Pacific NW Natl Lab, Adv Power Syst Grp, Richland, WA 99352 USA. [Welch, Greg] Univ Cent Florida, Healthcare Simulat, Orlando, FL 32816 USA. RP Zhou, N (reprint author), SUNY Binghamton, Dept Elect Engn, Binghamton, NY 13902 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1944-9925 BN 978-1-4673-8040-9 J9 IEEE POW ENER SOC GE PY 2015 PG 1 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE3YU UT WOS:000371397501105 ER PT S AU Zhou, N Dagle, J AF Zhou, Ning Dagle, Jeff GP IEEE TI Initial Results in Using a Self-Coherence Method for Detecting Sustained Oscillations SO 2015 IEEE POWER & ENERGY SOCIETY GENERAL MEETING SE IEEE Power and Energy Society General Meeting PESGM LA English DT Proceedings Paper CT General Meeting of the IEEE-Power-and-Energy-Society CY JUL 26-30, 2015 CL Denver, CO SP IEEE Power & Energy Soc C1 [Zhou, Ning] SUNY Binghamton, Dept Elect Engn, Binghamton, NY 13902 USA. [Dagle, Jeff] Pacific NW Natl Lab, Adv Power Syst Grp, Richland, WA 99352 USA. RP Zhou, N (reprint author), SUNY Binghamton, Dept Elect Engn, Binghamton, NY 13902 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1944-9925 BN 978-1-4673-8040-9 J9 IEEE POW ENER SOC GE PY 2015 PG 1 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE3YU UT WOS:000371397501038 ER PT J AU Lara, A Ramamurthy, B Pouyoul, E Monga, I AF Lara, Adrian Ramamurthy, Byrav Pouyoul, Eric Monga, Inder GP IEEE TI WAN Virtualization and Dynamic End-to-End Bandwidth Provisioning Using SDN SO 2015 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC) LA English DT Proceedings Paper CT Optical Fiber Communications Conference and Exhibition (OFC) CY MAR 22-26, 2015 CL Los Angeles, CA AB We evaluate a WAN-virtualization framework in terms of delay and scalability and demonstrate that adding a virtual layer between the physical topology and the end-user brings significant advantages and tolerable delays. C1 [Lara, Adrian; Ramamurthy, Byrav] Univ Nebraska, Lincoln, NE 68504 USA. [Pouyoul, Eric; Monga, Inder] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Energy Sci Network, Berkeley, CA 94720 USA. RP Lara, A (reprint author), Univ Nebraska, Lincoln, NE 68504 USA. EM alara@cse.unl.edu; byrav@cse.unl.edu; lomax@es.net; imonga@es.net NR 3 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-55752-937-4 PY 2015 PG 3 WC Engineering, Electrical & Electronic; Optics; Telecommunications SC Engineering; Optics; Telecommunications GA BE3MS UT WOS:000370976400116 ER PT S AU Fairclough, SR AF Fairclough, Stephen R. BE RuizTrillo, I Nedelcu, AM TI Choanoflagellates: Perspective on the Origin of Animal Multicellularity SO EVOLUTIONARY TRANSITIONS TO MULTICELLULAR LIFE: PRINCIPLES AND MECHANISMS SE Advances in Marine Genomics LA English DT Article; Book Chapter DE Choanoflagellate; Cadherin; Development; Evolution; Hedgling; Monosiga brevicollis; Multicellularity; RTK; Salpingoeca rosetta ID SALPINGOECA-ROSETTA; CELL-DIFFERENTIATION; PREMETAZOAN ANCESTRY; MONOSIGA-BREVICOLLIS; SIGNALING MACHINERY; EVOLUTION; METAZOAN; ADHESION; GENOME; KINASE AB For more than a century and half choanoflagellates, the closest living relatives of animals, have fascinated evolutionary biologists. By characterizing the similarities and differences between choanoflagellates and animals, biologists have gained perspective on the biology of their last common ancestor, the "Urchoanimal", as well as the evolutionary foundations of multicellularity and the origin of animals. The best-studied colonial choanoflagellate, Salpingoeca rosetta, forms colonies by cell division and not by cell aggregation. The observation that cytoplasmic bridges connect cells in S. rosetta colonies and other colonial choanoflagellates, as well as cells in sponges, suggests that this mechanism of colony formation may be ancestral within the choanoflagellate lineage and may have been present in the Urchoanimal as well. The comparison of choanoflagellate gene content and gene function with animal gene content and gene function has revealed that many of the basic mechanisms of cell adhesion, signaling, and differentiation that were previously thought to be unique to animals are also present in choanoflagellates, indicating that these genes were present prior to the evolution of animals. These insights refine our understanding of genes that emerged on the stem lineage leading to the last common ancestor of all animals, the "Urmetazoan". Taken together the data from choanoflagellates have provided deep insights into the biology of the Urchoanimal and the evolution of animal multicellularity. C1 [Fairclough, Stephen R.] Joint Genome Inst, Dept Energy, Walnut Creek, CA USA. RP Fairclough, SR (reprint author), Joint Genome Inst, Dept Energy, Walnut Creek, CA USA. EM srfairclough@gmail.com NR 50 TC 3 Z9 3 U1 4 U2 5 PU SPRINGER PI DORDRECHT PA PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 1879-8012 BN 978-94-017-9642-2; 978-94-017-9641-5 J9 ADV MAR GENOMICS PY 2015 VL 2 BP 99 EP 116 DI 10.1007/978-94-017-9642-2_5 D2 10.1007/978-94-017-9642-2 PG 18 WC Evolutionary Biology; Marine & Freshwater Biology SC Evolutionary Biology; Marine & Freshwater Biology GA BE4MR UT WOS:000371927000007 ER PT S AU Daniels, RJ McIntyre, T Kisner, R Killough, S Lenarduzzi, R AF Daniels, Ryan J. McIntyre, Timothy Kisner, Roger Killough, Stephen Lenarduzzi, Roberto GP IEEE TI Design and Implementation of a Hall Effect Sensor Array Applied to Recycling Hard Drive Magnets SO IEEE SOUTHEASTCON 2015 SE IEEE SoutheastCon-Proceedings LA English DT Proceedings Paper CT IEEE Southeast Conference (IEEE SoutheastCon) CY APR 09-12, 2015 CL Fort Lauderdale, FL SP IEEE DE Hall Effect sensors; hard drives; magnets AB Rare earths are an important resource for many electronic components and technologies. Examples abound including Neodymium magnets used in mobile devices and computer hard disk drives (HDDs) and in a variety of renewable energy technologies (e.g., wind turbines). More than 23,000 metric tons of Neodymium are processed annually; less than 1% is recycled. An economic system to assist in recycling magnet material from post-consumer goods, such as neodymium iron boron magnets commonly found in HDDs, is presented. A central component of this recycling measurement system uses an array of 128 Hall Effect sensors arranged in two columns to detect the magnetic flux lines orthogonal to the HDD. Results found using the system to scan planar shaped objects (e.g., HDDs) to identify and spatially locate rare earth magnets for removal and recycling from HDDs are presented. Other applications of the sensor array for identification and localization of magnetic components and assemblies are presented. C1 [Daniels, Ryan J.] Oak Ridge Inst Sci & Educ, Oak Ridge, TN 37831 USA. [McIntyre, Timothy; Kisner, Roger; Killough, Stephen; Lenarduzzi, Roberto] Oak Ridge Natl Lab, Elect & Elect Syst Res Div, Oak Ridge, TN 37831 USA. RP Daniels, RJ (reprint author), Oak Ridge Inst Sci & Educ, Oak Ridge, TN 37831 USA. EM danielsrj@ornl.gov NR 7 TC 0 Z9 0 U1 1 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1091-0050 BN 978-1-4673-7300-5 J9 IEEE SOUTHEASTCON PY 2015 PG 6 WC Computer Science, Theory & Methods; Engineering, Electrical & Electronic SC Computer Science; Engineering GA BE3YR UT WOS:000371393800013 ER PT S AU Daniels, RJ Acosta, M McIntyre, T Kisner, R Woodworth, K Lenarduzzi, R Frank, S McKnight, T Fugate, D AF Daniels, Ryan J. Acosta, Marisol McIntyre, Tim Kisner, Roger Woodworth, Ken Lenarduzzi, Roberto Frank, Shane McKnight, Tim Fugate, David GP IEEE TI Design of a Multisensory Probe for Measuring Carbon Cycle Processes in Aqueous Subterranean Environments SO IEEE SOUTHEASTCON 2015 SE IEEE SoutheastCon-Proceedings LA English DT Proceedings Paper CT IEEE Southeast Conference (IEEE SoutheastCon) CY APR 09-12, 2015 CL Fort Lauderdale, FL SP IEEE DE carbon cycle; climate change; soil carbon storage ID PEATLAND AB The global carbon cycle describes the exchange of carbon between the atmosphere, terrestrial vegetation, oceans, and soil. Mechanisms involving carbon in sub-terrestrial ecosystems and their impact on climate are not well understood. This lack of understanding limits current climate models and prevents accurate soil-carbon storage predications for future climate conditions. To address the lack of instrumentation for conducting high fidelity measurements of appropriate parameters in the field, a multi-sensory probe using a mix of optical, fiber optic, and electronic technologies to measure CO2, temperature, dissolved oxygen, redox potential, and water level in subsurface environments has been developed. Details of the design, fabrication and laboratory performance verification are presented. Use cases and the anticipated impacts of such measurements on climate models are discussed. C1 [Daniels, Ryan J.; Acosta, Marisol] Oak Ridge Inst Sci & Educ, Oak Ridge, TN USA. [McIntyre, Tim; Kisner, Roger; Woodworth, Ken; Lenarduzzi, Roberto; Frank, Shane; McKnight, Tim; Fugate, David] Oak Ridge Natl Lab, Elect & Elect Sci Res Div, Oak Ridge, TN USA. RP Daniels, RJ (reprint author), Oak Ridge Inst Sci & Educ, Oak Ridge, TN USA. EM danielsrj@ornl.gov NR 13 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1091-0050 BN 978-1-4673-7300-5 J9 IEEE SOUTHEASTCON PY 2015 PG 7 WC Computer Science, Theory & Methods; Engineering, Electrical & Electronic SC Computer Science; Engineering GA BE3YR UT WOS:000371393800010 ER PT S AU Koch, DB Payne, PW AF Koch, Daniel B. Payne, Patricia W. GP IEEE TI A Simple Evacuation Modeling and Simulation Tool for First Responders SO IEEE SOUTHEASTCON 2015 SE IEEE SoutheastCon-Proceedings LA English DT Proceedings Paper CT IEEE Southeast Conference (IEEE SoutheastCon) CY APR 09-12, 2015 CL Fort Lauderdale, FL SP IEEE DE evacuation modeling and simulation; incident management; emergency preparedness and response; geographic information systems; data fusion AB Although modeling and simulation of mass evacuations during a natural or man-made disaster is an on-going and vigorous area of study, tool adoption by front-line first responders is uneven. Some of the factors that account for this situation include cost and complexity of the software. For several years, Oak Ridge National Laboratory has been actively developing the free Incident Management Preparedness and Coordination Toolkit (IMPACT) to address these issues. One of the components of IMPACT is a multi-agent simulation module for area-based and path-based evacuations. The user interface is designed so that anyone familiar with typical computer drawing tools can quickly author a geospatially-correct evacuation visualization suitable for table-top exercises. Since IMPACT is designed for use in the field where network communications may not be available, quick on-site evacuation alternatives can be evaluated to keep pace with a fluid threat situation. Realism is enhanced by incorporating collision avoidance into the simulation. Statistics are gathered as the simulation unfolds, including most importantly time-to-evacuate, to help first responders choose the best course of action. C1 [Koch, Daniel B.; Payne, Patricia W.] Oak Ridge Natl Lab, Computat Sci & Engn Div, Oak Ridge, TN USA. RP Koch, DB (reprint author), Oak Ridge Natl Lab, Computat Sci & Engn Div, Oak Ridge, TN USA. EM kochdb@ornl.gov; paynepw@ornl.gov NR 7 TC 0 Z9 0 U1 1 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1091-0050 BN 978-1-4673-7300-5 J9 IEEE SOUTHEASTCON PY 2015 PG 5 WC Computer Science, Theory & Methods; Engineering, Electrical & Electronic SC Computer Science; Engineering GA BE3YR UT WOS:000371393800001 ER PT S AU Calkins, R Loer, B AF Calkins, Robert Loer, Ben CA SuperCDMS Collaboration BE Orrell, JL TI Prototyping an Active Neutron Veto for SuperCDMS SO LOW RADIOACTIVITY TECHNIQUES 2015 (LRT 2015) SE AIP Conference Proceedings LA English DT Proceedings Paper CT 5th International Workshop on Low Radioactivity Techniques (LRT) CY MAR 18-20, 2015 CL Univ Washington, Seattle, WA SP Pacific NW Natl Lab HO Univ Washington DE shielding; SuperCDMS; active neutron veto AB Neutrons, originating cosmogenically or from radioactive decays, can produce signals in dark matter detectors that are indistinguishable from Weakly Interacting Massive Particles (WIMPs). To combat this background for the SuperCDMS SNOLAB experiment, we are investigating designs for an active neutron veto within the constrained space of the compact SuperCDMS passive shielding. The current design employs an organic liquid scintillator mixed with an agent to enhance thermal neutron captures, with the scintillation light collected using wavelength-shifting fibers and read out by silicon photo-multipliers. We will describe the proposed veto and its predicted efficiency in detail and give some recent results from our R&D and prototyping efforts. C1 [Calkins, Robert] So Methodist Univ, Dept Phys, Dallas, TX 75275 USA. [Loer, Ben] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Calkins, R (reprint author), So Methodist Univ, Dept Phys, Dallas, TX 75275 USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0094-243X BN 978-0-7354-1319-1 J9 AIP CONF PROC PY 2015 VL 1672 AR 140002 DI 10.1063/1.4928018 PG 4 WC Physics, Applied; Physics, Nuclear SC Physics GA BE4GJ UT WOS:000371688900041 ER PT S AU Cebrian, S Perez, J Bandac, I Labarga, L Alvarez, V Barrado, AI Bettini, A Borges, FIGM Camargo, M Carcel, S Cervera, A Conde, CAN Conde, E Dafni, T Diaz, J Esteve, R Fernandes, LMP Fernandez, M Ferrario, P Freitas, EDC Fernandes, LMP Gehman, VM Goldschmidt, A Gomez-Cadenas, JJ Gonzalez-Diaz, D Gutierrez, RM Hauptman, J Morata, JAH Herrera, DC Irastorza, IG Laing, A Liubarsky, I Lopez-March, N Lorca, D Losada, M Luzon, G Mari, A Martin-Albo, J Martinez, A Martinez-Lema, G Miller, T Monrabal, F Monserrate, M Monteiro, CMB Mora, FJ Moutinho, LM Vidal, JM Nebot-Guinot, M Nygren, D Oliveira, CAB de Solorzano, AO Aparicio, JLP Querol, M Renner, J Ripoll, L Rodriguez, J Santos, FP dos Santos, JMF Serra, L Shuman, D Simon, A Sofka, C Sorel, M Toledo, JF Torrent, J Tsamalaidze, Z Veloso, JFCA Villar, JA Webb, RC White, JT Yahlali, N AF Cebrian, S. Perez, J. Bandac, I. Labarga, L. Alvarez, V. Barrado, A. I. Bettini, A. Borges, F. I. G. M. Camargo, M. Carcel, S. Cervera, A. Conde, C. A. N. Conde, E. Dafni, T. Diaz, J. Esteve, R. Fernandes, L. M. P. Fernandez, M. Ferrario, P. Freitas, E. D. C. Fernandes, L. M. P. Gehman, V. M. Goldschmidt, A. Gomez-Cadenas, J. J. Gonzalez-Diaz, D. Gutierrez, R. M. Hauptman, J. Hernando Morata, J. A. Herrera, D. C. Irastorza, I. G. Laing, A. Liubarsky, I. Lopez-March, N. Lorca, D. Losada, M. Luzon, G. Mari, A. Martin-Albo, J. Martinez, A. Martinez-Lema, G. Miller, T. Monrabal, F. Monserrate, M. Monteiro, C. M. B. Mora, F. J. Moutinho, L. M. Munoz Vidal, J. Nebot-Guinot, M. Nygren, D. Oliveira, C. A. B. Ortiz de Solorzano, A. Perez Aparicio, J. L. Querol, M. Renner, J. Ripoll, L. Rodriguez, J. Santos, F. P. dos Santos, J. M. F. Serra, L. Shuman, D. Simon, A. Sofka, C. Sorel, M. Toledo, J. F. Torrent, J. Tsamalaidze, Z. Veloso, J. F. C. A. Villar, J. A. Webb, R. C. White, J. T. Yahlali, N. BE Orrell, JL TI Radon and material radiopurity assessment for the NEXT double beta decay experiment SO LOW RADIOACTIVITY TECHNIQUES 2015 (LRT 2015) SE AIP Conference Proceedings LA English DT Proceedings Paper CT 5th International Workshop on Low Radioactivity Techniques (LRT) CY MAR 18-20, 2015 CL Univ Washington, Seattle, WA SP Pacific NW Natl Lab HO Univ Washington DE Double beta decay; Time-Projection Chamber (TPC); Gamma detectors (HPGe); Material radiopurity AB The "Neutrino Experiment with a Xenon TPC" (NEXT), intended to investigate the neutrinoless double beta decay using a high-pressure xenon gas TPC filled with Xe enriched in Xe-136 at the Canfranc Underground Laboratory in Spain, requires ultra-low background conditions demanding an exhaustive control of material radiopurity and environmental radon levels. An extensive material screening process is underway for several years based mainly on gamma-ray spectroscopy using ultra-low background germanium detectors in Canfranc but also on mass spectrometry techniques like GDMS and ICPMS. Components from shielding, pressure vessel, electroluminescence and high voltage elements and energy and tracking readout planes have been analyzed, helping in the final design of the experiment and in the construction of the background model. The latest measurements carried out will be presented and the implication on NEXT of their results will be discussed. The commissioning of the NEW detector, as a first step towards NEXT, has started in Canfranc; in-situ measurements of airborne radon levels were taken there to optimize the system for radon mitigation and will be shown too. C1 [Cebrian, S.; Dafni, T.; Gonzalez-Diaz, D.; Herrera, D. C.; Irastorza, I. G.; Luzon, G.; Ortiz de Solorzano, A.; Villar, J. A.] Univ Zaragoza, Lab Fis Nucl & Astroparticulas, C Pedro Cerbuna 12, E-50009 Zaragoza, Spain. [Cebrian, S.; Bandac, I.; Bettini, A.; Dafni, T.; Gonzalez-Diaz, D.; Herrera, D. C.; Irastorza, I. G.; Luzon, G.; Ortiz de Solorzano, A.; Villar, J. A.] Lab Subterrcineo Canfranc, Canfranc Estacion 22880, Huesca, Spain. [Perez, J.] UAM CSIC, Inst Fis Teor, Madrid 28049, Spain. [Labarga, L.] Univ Autonoma Madrid, Dept Fis Teor, E-28049 Madrid, Spain. [Alvarez, V.; Carcel, S.; Cervera, A.; Diaz, J.; Ferrario, P.; Gomez-Cadenas, J. J.; Laing, A.; Liubarsky, I.; Lopez-March, N.; Lorca, D.; Martin-Albo, J.; Martinez, A.; Monrabal, F.; Monserrate, M.; Munoz Vidal, J.; Nebot-Guinot, M.; Querol, M.; Rodriguez, J.; Serra, L.; Simon, A.; Sorel, M.; Yahlali, N.] CSIC, Inst Fis Corpuscular, Valencia 46980, Spain. [Alvarez, V.; Carcel, S.; Cervera, A.; Diaz, J.; Ferrario, P.; Gomez-Cadenas, J. J.; Laing, A.; Liubarsky, I.; Lopez-March, N.; Lorca, D.; Martin-Albo, J.; Martinez, A.; Monrabal, F.; Monserrate, M.; Munoz Vidal, J.; Nebot-Guinot, M.; Querol, M.; Rodriguez, J.; Serra, L.; Simon, A.; Sorel, M.; Yahlali, N.] Univ Valencia, Valencia 46980, Spain. [Barrado, A. I.; Conde, E.; Fernandez, M.] Ctr Invest Energet Medioambientales & Tecnol, Madrid 28040, Spain. [Bettini, A.] Univ Padua, I-35131 Padua, Italy. [Bettini, A.] INFN Sect, Dipartimento Fis G Galilei, I-35131 Padua, Italy. [Borges, F. I. G. M.; Conde, C. A. N.; Fernandes, L. M. P.; Monteiro, C. M. B.; Santos, F. P.; dos Santos, J. M. F.] Univ Coimbra, Dept Fis, P-3004516 Coimbra, Portugal. [Camargo, M.; Gutierrez, R. M.; Losada, M.] Univ Antonio Narino, Ctr Invest Ciencias Basicas & Aplicadas, Bogota, Colombia. [Esteve, R.; Mari, A.; Mora, F. J.; Toledo, J. F.] Univ Politecn Valencia, Inst Instrumentac Imagen Mol, E-46022 Valencia, Spain. [Freitas, E. D. C.; Moutinho, L. M.; Veloso, J. F. C. A.] Univ Aveiro, Inst Nanostruct Nanomodelling & Nanofabricat, P-3810193 Aveiro, Portugal. [Gehman, V. M.; Goldschmidt, A.; Miller, T.; Nygren, D.; Oliveira, C. A. B.; Renner, J.; Shuman, D.] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. [Hauptman, J.] Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA. [Hernando Morata, J. A.; Martinez-Lema, G.] Univ Santiago de Compostela, Inst Gallego Fis Altas Energias, Santiago De Compostela 15782, Spain. [Perez Aparicio, J. L.] Univ Politecn Valencia, Dpto Mecan Medios Continuos & Teoria Estruct, Valencia 46071, Spain. [Ripoll, L.; Torrent, J.] Univ Girona, Escola Politecn Super, Girona 17071, Spain. [Sofka, C.; Webb, R. C.; White, J. T.] Texas A&M Univ, Dept Phys & Astron, College Stn, TX 77843 USA. [Tsamalaidze, Z.] Joint Inst Nucl Res, Dubna 141980, Russia. RP Cebrian, S (reprint author), Univ Zaragoza, Lab Fis Nucl & Astroparticulas, C Pedro Cerbuna 12, E-50009 Zaragoza, Spain. RI Irastorza, Igor/B-2085-2012; Villar, Jose Angel/K-6630-2014; veloso, joao/J-4478-2013; Diaz, Jose/B-3454-2012; Moutinho, Luis/J-6021-2013; Lopez March, Neus/P-4411-2014 OI Irastorza, Igor/0000-0003-1163-1687; Villar, Jose Angel/0000-0003-0228-7589; Toledo Alarcon, Jose Francisco/0000-0002-9782-4510; Freitas, Elisabete/0000-0001-8235-3229; Martin-Albo, Justo/0000-0002-7318-1469; Veloso, Joao/0000-0002-7107-7203; Diaz, Jose/0000-0002-7239-223X; Moutinho, Luis/0000-0001-9074-4449; Lopez March, Neus/0000-0001-6586-0675 NR 22 TC 1 Z9 1 U1 5 U2 5 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0094-243X BN 978-0-7354-1319-1 J9 AIP CONF PROC PY 2015 VL 1672 AR 060002 DI 10.1063/1.4927990 PG 6 WC Physics, Applied; Physics, Nuclear SC Physics GA BE4GJ UT WOS:000371688900013 ER PT S AU Cuesta, C Abgrall, N Arnquist, IJ Avignone, FT Baldenegro-Barrera, CX Barabash, AS Bertrand, FE Bradley, AW Brudanin, V Busch, M Buuck, M Byram, D Caldwell, AS Chan, YD Christofferson, CD Detwiler, JA Efremenko, Y Ejiri, H Elliott, SR Galindo-Uribarri, A Gilliss, T Giovanetti, GK Goett, J Green, MP Gruszko, J Guinn, IS Guiseppe, VE Henning, R Hoppe, EW Howard, S Howe, MA Jasinski, BR Keeter, KJ Kidd, MF Konovalov, SI Kouzes, RT LaFerriere, BD Leon, J MacMullin, J Martin, RD Meijer, SJ Mertens, S Orrell, JL O'Shaughnessyn, C Poon, AWP Radford, DC Rager, J Rielage, K Robertson, RGH Romero-Romero, E Shanks, B Shirchenko, M Snyder, N Suriano, AM Tedeschi, D Trimble, JE Varner, RL Vasilyev, S Vetter, K Vorren, K White, BR Wilkerson, JF Wisernan, C Xu, W Yakushev, E Yu, CH Yumatov, V Zhitnikov, I AF Cuesta, C. Abgrall, N. Arnquist, I. J. Avignone, F. T., III Baldenegro-Barrera, C. X. Barabash, A. S. Bertrand, F. E. Bradley, A. W. Brudanin, V. Busch, M. Buuck, M. Byram, D. Caldwell, A. S. Chan, Y-D. Christofferson, C. D. Detwiler, J. A. Efremenko, Yu. Ejiri, H. Elliott, S. R. Galindo-Uribarri, A. Gilliss, T. Giovanetti, G. K. Goett, J. Green, M. P. Gruszko, J. Guinn, I. S. Guiseppe, V. E. Henning, R. Hoppe, E. W. Howard, S. Howe, M. A. Jasinski, B. R. Keeter, K. J. Kidd, M. F. Konovalov, S. I. Kouzes, R. T. LaFerriere, B. D. Leon, J. MacMullin, J. Martin, R. D. Meijer, S. J. Mertens, S. Orrell, J. L. O'Shaughnessyn, C. Poon, A. W. P. Radford, D. C. Rager, J. Rielage, K. Robertson, R. G. H. Romero-Romero, E. Shanks, B. Shirchenko, M. Snyder, N. Suriano, A. M. Tedeschi, D. Trimble, J. E. Varner, R. L. Vasilyev, S. Vetter, K. Vorren, K. White, B. R. Wilkerson, J. F. Wisernan, C. Xu, W. Yakushev, E. Yu, C. -H. Yumatov, V. Zhitnikov, I. BE Orrell, JL TI Analysis techniques for background rejection at the MAJORANA DEMONSTRATOR SO LOW RADIOACTIVITY TECHNIQUES 2015 (LRT 2015) SE AIP Conference Proceedings LA English DT Proceedings Paper CT 5th International Workshop on Low Radioactivity Techniques (LRT) CY MAR 18-20, 2015 CL Univ Washington, Seattle, WA SP Pacific NW Natl Lab HO Univ Washington DE neutrinoless double-beta decay; germanium detector AB The MAJORANA Collaboration is constructing the MAJORANA DEMONSTRATOR, an ultra-low background, 40-kg modular HPGe detector array to search for neutrinoless double beta decay in Ge-76. In view of the next generation of tonne-scale Ge-based 0 nu beta beta-decay searches that will probe the neutrino mass scale in the inverted-hierarchy region, a major goal of the MAJORANA DEMONSTRATOR is to demonstrate a path forward to achieving a background rate at or below 1 count/tonne/year in the 4 keV region of interest around the Q-value at 2039 keV. The background rejection techniques to be applied to the data include cuts based on data reduction, pulse shape analysis, event coincidences, and time correlations. The Point Contact design of the DEMONSTRATOR's germanium detectors allows for significant reduction of gamma background. C1 [Cuesta, C.; Buuck, M.; Detwiler, J. A.; Gruszko, J.; Guinn, I. S.; Leon, J.; Robertson, R. G. H.] Univ Washington, Ctr Expt Nucl Phys & Astrophys, Seattle, WA 98195 USA. [Cuesta, C.; Buuck, M.; Detwiler, J. A.; Gruszko, J.; Guinn, I. S.; Leon, J.; Robertson, R. G. H.] Univ Washington, Dept Phys, Seattle, WA 98195 USA. [Abgrall, N.; Bradley, A. W.; Chan, Y-D.; Mertens, S.; Poon, A. W. P.; Vetter, K.] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Nucl Sci, Berkeley, CA 94720 USA. [Arnquist, I. J.; Hoppe, E. W.; Kouzes, R. T.; LaFerriere, B. D.; Orrell, J. L.] Pacific NW Natl Lab, Richland, WA 99352 USA. [Avignone, F. T., III; Guiseppe, V. E.; Tedeschi, D.; Wisernan, C.] Univ S Carolina, Dept Phys & Astron, Columbia, SC 29208 USA. [Avignone, F. T., III; Baldenegro-Barrera, C. X.; Bertrand, F. E.; Galindo-Uribarri, A.; Green, M. P.; Radford, D. C.; Romero-Romero, E.; Varner, R. L.; White, B. R.; Wilkerson, J. F.; Yu, C. -H.] Oak Ridge Natl Lab, Oak Ridge, TN USA. [Barabash, A. S.; Konovalov, S. I.; Yumatov, V.] Inst Theoret & Expt Phys, Moscow 117259, Russia. [Brudanin, V.; Shirchenko, M.; Vasilyev, S.; Yakushev, E.; Zhitnikov, I.] Joint Inst Nucl Res, Dubna, Russia. [Busch, M.] Duke Univ, Dept Phys, Durham, NC 27706 USA. [Busch, M.; Gilliss, T.; Giovanetti, G. K.; Henning, R.; Howe, M. A.; MacMullin, J.; Meijer, S. J.; O'Shaughnessyn, C.; Rager, J.; Shanks, B.; Trimble, J. E.; Vorren, K.; Wilkerson, J. F.] Triangle Univ Nucl Lab, Durham, NC 27706 USA. [Byram, D.; Jasinski, B. R.; Martin, R. D.; Snyder, N.] Univ S Dakota, Dept Phys, Vermillion, SD 57069 USA. [Caldwell, A. S.; Christofferson, C. D.; Howard, S.; Suriano, A. M.] South Dakota Sch Mines & Technol, Rapid City, SD USA. [Efremenko, Yu.; Romero-Romero, E.] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA. [Ejiri, H.] Osaka Univ, Nucl Phys Res Ctr, Osaka, Japan. [Ejiri, H.] Osaka Univ, Dept Phys, Osaka, Japan. [Gilliss, T.; Giovanetti, G. K.; Henning, R.; Howe, M. A.; MacMullin, J.; Meijer, S. J.; O'Shaughnessyn, C.; Rager, J.; Shanks, B.; Trimble, J. E.; Vorren, K.; Wilkerson, J. F.] Univ N Carolina, Dept Phys & Astron, Chapel Hill, NC USA. [Elliott, S. R.; Goett, J.; Rielage, K.; Xu, W.] Los Alamos Natl Lab, Los Alamos, NM USA. [Keeter, K. J.] Black Hills State Univ, Dept Phys, Spearfish, SD 57799 USA. [Kidd, M. F.] Tennessee Technol Univ, Cookeville, TN USA. [Vetter, K.] Univ Calif Berkeley, Dept Nucl Engn, Berkeley, CA 94720 USA. RP Cuesta, C (reprint author), Univ Washington, Ctr Expt Nucl Phys & Astrophys, Seattle, WA 98195 USA. RI Barabash, Alexander/S-8851-2016; OI Rielage, Keith/0000-0002-7392-7152 NR 9 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0094-243X BN 978-0-7354-1319-1 J9 AIP CONF PROC PY 2015 VL 1672 AR 140006 DI 10.1063/1.4928022 PG 4 WC Physics, Applied; Physics, Nuclear SC Physics GA BE4GJ UT WOS:000371688900045 ER PT S AU Guinn, I Abgrall, N Arnquist, IJ Avignone, FT Baldenegro-Barrera, CX Barabash, AS Bertrand, FE Bradley, AW Brudanin, V Busch, M Buuck, M Byram, D Caldwell, AS Chan, YD Christofferson, CD Cuesta, C Detwiler, JA Efremenko, Y Ejiri, H Elliott, SR Galindo-Uribarri, A Gilliss, T Giovanetti, GK Goett, J Green, MP Gruszko, J Guiseppe, VE Henning, R Hoppe, EW Howard, S Howe, MA Jasinski, BR Keeter, KJ Kidd, MF Konovalov, SI Kouzes, RT LaFerriere, BD Leon, J MacMullin, J Martin, RD Meijer, SJ Mertens, S Orrell, JL O'Shaughnessy, C Poon, AWP Radford, DC Rager, J Rielage, K Robertson, RGH Romero-Romero, E Shanks, B Shirchenko, M Snyder, N Suriano, AM Tedeschi, D Trimble, JE Varner, RL Vasilyev, S Vetter, K Vorren, K White, BR Wilkerson, JF Wiseman, C Xu, W Yakushev, E Yu, CH Yumatov, V Zhitnikov, I AF Guinn, I. Abgrall, N. Arnquist, I. J. Avignone, F. T. Baldenegro-Barrera, C. X. Barabash, A. S. Bertrand, F. E. Bradley, A. W. Brudanin, V. Busch, M. Buuck, M. Byram, D. Caldwell, A. S. Chan, Y-D. Christofferson, C. D. Cuesta, C. Detwiler, J. A. Efremenko, Yu. Ejiri, H. Elliott, S. R. Galindo-Uribarri, A. Gilliss, T. Giovanetti, G. K. Goett, J. Green, M. P. Gruszko, J. Guiseppe, V. E. Henning, R. Hoppe, E. W. Howard, S. Howe, M. A. Jasinski, B. R. Keeter, K. J. Kidd, M. F. Konovalov, S. I. Kouzes, R. T. LaFerriere, B. D. Leon, J. MacMullin, J. Martin, R. D. Meijer, S. J. Mertens, S. Orrell, J. L. O'Shaughnessy, C. Poon, A. W. P. Radford, D. C. Rager, J. Rielage, K. Robertson, R. G. H. Romero-Romero, E. Shanks, B. Shirchenko, M. Snyder, N. Suriano, A. M. Tedeschi, D. Trimble, J. E. Varner, R. L. Vasilyev, S. Vetter, K. Vorren, K. White, B. R. Wilkerson, J. F. Wiseman, C. Xu, W. Yakushev, E. Yu, C. -H. Yumatov, V. Zhitnikov, I. BE Orrell, JL TI Low Background Signal Readout Electronics for the MAJORANA DEMONSTRATOR SO LOW RADIOACTIVITY TECHNIQUES 2015 (LRT 2015) SE AIP Conference Proceedings LA English DT Proceedings Paper CT 5th International Workshop on Low Radioactivity Techniques (LRT) CY MAR 18-20, 2015 CL Univ Washington, Seattle, WA SP Pacific NW Natl Lab HO Univ Washington DE neutrinoless double beta decay; germanium detector; low background electronics AB The MAJORANA Collaboration will seek neutrinoless double beta decay (0 nu beta beta) in Ge-76 using isotopically enriched p-type point contact (PPC) high purity Germanium (HPGe) detectors. A tonne-scale array of HPGe detectors would require background levels below 1 count/ROI-tonne-year in the 4 keV region of interest (ROI) around the 2039 keV Q-value of the decay. In order to demonstrate the feasibility of such an experiment, the MAJORANA DEMONSTRATOR, a 40 kg HPGe detector array, is being constructed with a background goal of <3 counts/ROI-tonne-year, which is expected to scale down to <1 count/ROI-tonne-year for a tonne-scale experiment. The signal readout electronics, which must be placed in close proximity to the detectors, present a challenge toward reaching this background goal. This talk will discuss the materials and design used to construct signal readout electronics with low enough backgrounds for the MAJORANA DEMONSTRATOR. C1 [Guinn, I.; Buuck, M.; Cuesta, C.; Detwiler, J. A.; Gruszko, J.; Leon, J.; Robertson, R. G. H.] Univ Washington, Ctr Expt Nucl Phys & Astrophys, Seattle, WA 98195 USA. [Guinn, I.; Buuck, M.; Cuesta, C.; Detwiler, J. A.; Gruszko, J.; Leon, J.; Robertson, R. G. H.] Univ Washington, Dept Phys, Seattle, WA 98195 USA. [Abgrall, N.; Bradley, A. W.; Chan, Y-D.; Mertens, S.; Poon, A. W. P.; Vetter, K.] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Nucl Sci, 1 Cyclotron Rd, Berkeley, CA 94720 USA. [Arnquist, I. J.; Hoppe, E. W.; Kouzes, R. T.; LaFerriere, B. D.; Orrell, J. L.] Pacific NW Natl Lab, Richland, WA 99352 USA. [Avignone, F. T.; Guiseppe, V. E.; Tedeschi, D.; Wiseman, C.] Univ S Carolina, Dept Phys & Astron, Columbia, SC 29208 USA. [Avignone, F. T.; Baldenegro-Barrera, C. X.; Bertrand, F. E.; Galindo-Uribarri, A.; Green, M. P.; Radford, D. C.; Romero-Romero, E.; Varner, R. L.; White, B. R.; Wilkerson, J. F.; Yu, C. -H.] Oak Ridge Natl Lab, Oak Ridge, TN USA. [Barabash, A. S.; Konovalov, S. I.; Yumatov, V.] Inst Theoret & Expt Phys, Moscow 117259, Russia. [Brudanin, V.; Shirchenko, M.; Vasilyev, S.; Yakushev, E.; Zhitnikov, I.] Joint Inst Nucl Res, Dubna, Russia. [Busch, M.] Duke Univ, Dept Phys, Durham, NC 27706 USA. [Busch, M.; Gilliss, T.; Giovanetti, G. K.; Henning, R.; Howe, M. A.; MacMullin, J.; Meijer, S. J.; O'Shaughnessy, C.; Rager, J.; Shanks, B.; Trimble, J. E.; Vorren, K.; Wilkerson, J. F.] Triangle Univ Nucl Lab, Durham, NC 27706 USA. [Byram, D.; Jasinski, B. R.; Martin, R. D.; Snyder, N.] Univ S Dakota, Dept Phys, Vermillion, SD 57069 USA. [Caldwell, A. S.; Christofferson, C. D.; Howard, S.; Suriano, A. M.] South Dakota Sch Mines & Technol, Rapid City, SD USA. [Efremenko, Yu.; Romero-Romero, E.] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA. [Ejiri, H.] Osaka Univ, Nucl Phys Res Ctr, Osaka, Japan. [Ejiri, H.] Osaka Univ, Dept Phys, Osaka, Japan. [Gilliss, T.; Giovanetti, G. K.; Henning, R.; Howe, M. A.; MacMullin, J.; Meijer, S. J.; O'Shaughnessy, C.; Rager, J.; Shanks, B.; Trimble, J. E.; Vorren, K.; Wilkerson, J. F.] Univ N Carolina, Dept Phys & Astron, Chapel Hill, NC USA. [Elliott, S. R.; Goett, J.; Rielage, K.; Xu, W.] Los Alamos Natl Lab, Los Alamos, NM USA. [Keeter, K. J.] Black Hills State Univ, Dept Phys, Spearfish, SD 57799 USA. [Kidd, M. F.] Tennessee Technol Univ, Cookeville, TN 38505 USA. [Vetter, K.] Univ Calif Berkeley, Dept Nucl Engn, Berkeley, CA 94720 USA. RP Guinn, I (reprint author), Univ Washington, Ctr Expt Nucl Phys & Astrophys, Seattle, WA 98195 USA. RI Barabash, Alexander/S-8851-2016; OI Rielage, Keith/0000-0002-7392-7152; Cuesta, Clara/0000-0003-1190-7233 NR 6 TC 0 Z9 0 U1 0 U2 1 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0094-243X BN 978-0-7354-1319-1 J9 AIP CONF PROC PY 2015 VL 1672 AR 030001 DI 10.1063/1.4927982 PG 6 WC Physics, Applied; Physics, Nuclear SC Physics GA BE4GJ UT WOS:000371688900005 ER PT S AU Lesko, KT AF Lesko, Kevin T. BE Orrell, JL TI North American Deep Underground Laboratories: Soudan Underground Laboratory, SNOLab, and the Sanford Underground Research Facility SO LOW RADIOACTIVITY TECHNIQUES 2015 (LRT 2015) SE AIP Conference Proceedings LA English DT Proceedings Paper CT 5th International Workshop on Low Radioactivity Techniques (LRT) CY MAR 18-20, 2015 CL Univ Washington, Seattle, WA SP Pacific NW Natl Lab HO Univ Washington AB Over the past several decades, fundamental physics experiments have required access to deep underground laboratories to satisfy the increasingly strict requirements for ultra-low background environments and shielding from cosmic rays. In this presentation, I summarize the existing and anticipated physics programs and laboratory facilities of North America's deep facilities: The Soudan Underground Laboratory in Minnesota, SNOLab in Ontario, Canada, and the Sanford Underground Research Facility in Lead, South Dakota. C1 [Lesko, Kevin T.] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Phys, 1 Cyclotron Rd, Berkeley, CA 94720 USA. RP Lesko, KT (reprint author), Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Phys, 1 Cyclotron Rd, Berkeley, CA 94720 USA. EM ktlesko@lbl.gov NR 2 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0094-243X BN 978-0-7354-1319-1 J9 AIP CONF PROC PY 2015 VL 1672 AR 020001 DI 10.1063/1.4927978 PG 6 WC Physics, Applied; Physics, Nuclear SC Physics GA BE4GJ UT WOS:000371688900001 ER PT S AU Nakajima, Y Draeger, E Lin, CJ Luk, KB Ochoa-Ricoux, JP Steiner, H White, CG AF Nakajima, Y. Draeger, E. Lin, C. J. Luk, K. B. Ochoa-Ricoux, J. P. Steiner, H. White, C. G. BE Orrell, JL TI Study of Muon-induced Neutron Production Using Accelerator Muon Beam at CERN SO LOW RADIOACTIVITY TECHNIQUES 2015 (LRT 2015) SE AIP Conference Proceedings LA English DT Proceedings Paper CT 5th International Workshop on Low Radioactivity Techniques (LRT) CY MAR 18-20, 2015 CL Univ Washington, Seattle, WA SP Pacific NW Natl Lab HO Univ Washington DE Fast neutron; Neutron production; Cosmogenic backgrounds AB Cosmogenic muon-induced neutrons are one of the most problematic backgrounds for various underground experiments for rare event searches. In order to accurately understand such backgrounds, experimental data with high-statistics and well-controlled systematics is essential. We performed a test experiment to measure muon-induced neutron production yield and energy spectrum using a high-energy accelerator muon beam at CERN. We successfully observed neutrons from 160 GeV/c muon interaction on lead, and measured kinetic energy distributions for various production angles. Works towards evaluation of absolute neutron production yield is underway. This work also demonstrates that the setup is feasible for a future large-scale experiment for more comprehensive study of muon-induced neutron production. C1 [Nakajima, Y.; Lin, C. J.; Luk, K. B.; Ochoa-Ricoux, J. P.; Steiner, H.] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. [Draeger, E.; White, C. G.] IIT, Chicago, IL 60616 USA. [Luk, K. B.; Steiner, H.] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. RP Nakajima, Y (reprint author), Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. OI Ochoa-Ricoux, Juan Pedro/0000-0001-7376-5555 NR 6 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0094-243X BN 978-0-7354-1319-1 J9 AIP CONF PROC PY 2015 VL 1672 AR 090002 DI 10.1063/1.4928000 PG 6 WC Physics, Applied; Physics, Nuclear SC Physics GA BE4GJ UT WOS:000371688900023 ER PT S AU Pocar, A AF Pocar, Andrea CA EXO-200 Collaboration BE Orrell, JL TI Liquid Xenon Purification, De-Radonation (and De-Kryptonation) SO LOW RADIOACTIVITY TECHNIQUES 2015 (LRT 2015) SE AIP Conference Proceedings LA English DT Proceedings Paper CT 5th International Workshop on Low Radioactivity Techniques (LRT) CY MAR 18-20, 2015 CL Univ Washington, Seattle, WA SP Pacific NW Natl Lab HO Univ Washington ID EXO-200; SEARCH AB Liquid xenon detectors are at the forefront of rare event physics, including searches for neutrino-less double beta decay and WIMP dark matter. The xenon for these experiments needs to be purified from chemical impurities such as electronegative atoms and molecules, which absorb ionization electrons, and VUV (178 nm) scintillation light-absorbing chemical species. In addition, superb purification from radioactive impurities is required. Particularly challenging are radioactive noble isotopes (Kr-85, Ar-39,Ar-42, Rn-220,Rn-222). Radon is a particularly universal problem, due to the extended decay sequence of its daughters and its ubiquitous presence in detector materials. Purification and de-radonation of liquid xenon are addressed with particular focus on the experience gained with the EXO-200 neutrino-less double beta decay detector. C1 [Pocar, Andrea] Univ Massachusetts, Amherst Ctr Fundamental Interact, Amherst, MA 01003 USA. [Pocar, Andrea] Univ Massachusetts, Dept Phys, Amherst, MA 01003 USA. [Pocar, Andrea] Lawrence Livermore Natl Lab, Div Phys, Livermore, CA 94550 USA. RP Pocar, A (reprint author), Univ Massachusetts, Amherst Ctr Fundamental Interact, Amherst, MA 01003 USA. EM pocar@umass.edu NR 27 TC 0 Z9 0 U1 0 U2 1 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0094-243X BN 978-0-7354-1319-1 J9 AIP CONF PROC PY 2015 VL 1672 AR UNSP 060001 DI 10.1063/1.4927989 PG 6 WC Physics, Applied; Physics, Nuclear SC Physics GA BE4GJ UT WOS:000371688900012 ER PT S AU Rosero, R Yeh, MF AF Rosero, Richard Yeh, Minfang BE Orrell, JL TI Radiopure Metal-Loaded Liquid Scintillator SO LOW RADIOACTIVITY TECHNIQUES 2015 (LRT 2015) SE AIP Conference Proceedings LA English DT Proceedings Paper CT 5th International Workshop on Low Radioactivity Techniques (LRT) CY MAR 18-20, 2015 CL Univ Washington, Seattle, WA SP Pacific NW Natl Lab HO Univ Washington AB Metal-loaded liquid scintillator plays a key role in particle and nuclear physics experiments. The applications of metal ions in various neutrino experiments and the purification methods for different scintillator components are discussed in this paper. C1 [Rosero, Richard; Yeh, Minfang] Brookhaven Natl Lab, Upton, NY 11973 USA. RP Yeh, MF (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. EM yeh@bnl.gov NR 16 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0094-243X BN 978-0-7354-1319-1 J9 AIP CONF PROC PY 2015 VL 1672 AR 080002 DI 10.1063/1.4927997 PG 6 WC Physics, Applied; Physics, Nuclear SC Physics GA BE4GJ UT WOS:000371688900020 ER PT S AU Thomas, KJ Smith, AR Poon, AWP Chan, YD Norman, EB Lesko, KT AF Thomas, K. J. Smith, A. R. Poon, A. W. P. Chan, Y. D. Norman, E. B. Lesko, K. T. BE Orrell, JL TI Berkeley Low Background Facility SO LOW RADIOACTIVITY TECHNIQUES 2015 (LRT 2015) SE AIP Conference Proceedings LA English DT Proceedings Paper CT 5th International Workshop on Low Radioactivity Techniques (LRT) CY MAR 18-20, 2015 CL Univ Washington, Seattle, WA SP Pacific NW Natl Lab HO Univ Washington DE low background counting; neutron activation analysis; gamma spectroscopy; material assay; HPGe; natural radioactivity; radon; underground physics; muon veto; dark matter; neutrinoless double beta decay ID NEUTRON-ACTIVATION ANALYSIS; SILICON AB The Berkeley Low Background Facility (BLBF) at Lawrence Berkeley National Laboratory (LBNL) in Berkeley, California provides low background gamma spectroscopy services to a wide array of experiments and projects. The analysis of samples takes place within two unique facilities; locally within a carefully-constructed, low background laboratory on the surface at LBNL and at the Sanford Underground Research Facility (SURF) in Lead, SD. These facilities provide a variety of gamma spectroscopy services to low background experiments primarily in the form of passive material screening for primordial radioisotopes (U, Th, K) or common cosmogenic/anthropogenic products; active screening via neutron activation analysis for U, Th, and K as well as a variety of stable isotopes; and neutron flux/beam characterization measurements through the use of monitors. A general overview of the facilities, services, and sensitivities will be presented. Recent activities and upgrades will also be described including an overview of the recently installed counting system at SURF (recently relocated from Oroville, CA in 2014), the installation of a second underground counting station at SURF in 2015, and future plans. The BLBF is open to any users for counting services or collaboration on a wide variety of experiments and projects. C1 [Thomas, K. J.; Norman, E. B.] Univ Calif Berkeley, Dept Nucl Engn, Berkeley, CA 94720 USA. [Thomas, K. J.; Smith, A. R.; Poon, A. W. P.; Chan, Y. D.; Norman, E. B.] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Nucl Sci, Berkeley, CA 94720 USA. [Lesko, K. T.] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Phys, Berkeley, CA 94720 USA. RP Thomas, KJ (reprint author), Univ Calif Berkeley, Dept Nucl Engn, Berkeley, CA 94720 USA. NR 13 TC 1 Z9 1 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0094-243X BN 978-0-7354-1319-1 J9 AIP CONF PROC PY 2015 VL 1672 AR 020004 DI 10.1063/1.4927981 PG 6 WC Physics, Applied; Physics, Nuclear SC Physics GA BE4GJ UT WOS:000371688900004 ER PT S AU Jimenez-Mier, J Olalde-Velasco, P Yang, WL Denlinger, J AF Jimenez-Mier, J. Olalde-Velasco, P. Yang, W. -L. Denlinger, J. BE Espinosa, G Lopez, CV Lopez, JA TI X-Ray absorption and resonant inelastic x-ray scattering (RIXS) show the presence of Cr+ at the surface and in the bulk of CrF2 SO RADIATION PHYSICS: XI INTERNATIONAL SYMPOSIUM ON RADIATION PHYSICS SE AIP Conference Proceedings LA English DT Proceedings Paper CT 11th International Symposium on Radiation Physics (ISRP) CY MAR 04-06, 2015 CL Univ Autonoma Ciudad Juarez, Ciudad Juarez, MEXICO SP Univ Autonoma Ciudad Juarez, Inst Engn & Technol, Gobierno Estado Chihuahua, Montajes Electromecanicos & Ingn SA CV, Consejo Nacl Ciencia & Tecnologia, Univ Nacl Autonoma Mexico, Univ Nacl Autonoma Mexico, Inst Fis, Soc Mexicana Fis HO Univ Autonoma Ciudad Juarez DE Chromium di-fluoride; x-ray absorption and emission; oxidation states ID EMISSION; EDGE; SPECTROSCOPY; OXIDATION; STATES AB X-Ray absorption and resonant inelastic x-ray scattering (RIXS) spectra of CrF2 recorded at the chromium L-2,L-3 are presented. An atomic multiplet crystal field calculation is compared with the experimental data. Experiment and theory are in agreement once the calculation includes three chromium oxidation states, namely Cr+, Cr2+, and Cr3+. X-Ray absorption allows a direct determination of the surface oxidation, while the RIXS spectra shows the presence of these three oxidation states in the sample bulk. To give a quantitative interpretation of the RIXS data the effect of the incomming and outgoing photon penetration depth and self-absorption must be considered. For the much simpler case of MnF2, with only one metal oxidation state, the measured RIXS spectra relative intensities are found to be proportional to the square of the sample attenuation length. C1 [Jimenez-Mier, J.] Univ Nacl Autonoma Mexico, Inst Ciencias Nucl, Mexico City 04510, DF, Mexico. [Olalde-Velasco, P.; Yang, W. -L.; Denlinger, J.] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Adv Light Source, Berkeley, CA 94720 USA. [Olalde-Velasco, P.] Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland. RP Jimenez-Mier, J (reprint author), Univ Nacl Autonoma Mexico, Inst Ciencias Nucl, Mexico City 04510, DF, Mexico. RI Jimenez-Mier, Jose/A-5081-2009 OI Jimenez-Mier, Jose/0000-0002-5939-9568 NR 17 TC 0 Z9 0 U1 2 U2 3 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0094-243X BN 978-0-7354-1318-4 J9 AIP CONF PROC PY 2015 VL 1671 AR 020002 DI 10.1063/1.4927179 PG 7 WC Physics, Applied; Physics, Nuclear SC Physics GA BE4GL UT WOS:000371691800002 ER PT S AU Becerra, L Bianco, CL Cipolletta, F Enderli, M Fryer, CL Izzo, L Kovacevic, M de Lima, RCR Muccino, M de Oliveira, FG Penacchioni, AV Pisani, GB Rueda, JA Ruffini, R Wang, Y Zaninoni, E AF Becerra, Laura Bianco, Carlo Luciano Cipolletta, Federico Enderli, Maxime Fryer, Chris L. Izzo, Luca Kovacevic, Milos de Lima, Rafael Camargo Rodrigues Muccino, Marco de Oliveira, Fernanda Gomes Penacchioni, Ana Virginia Pisani, Giovanni Battista Rueda, Jorge Armando Ruffini, Remo Wang, Yu Zaninoni, Elena BE DeAlmeida, UB Chardonnet, P Negreiros, RP Rueda, J Ruffini, R Vereshchagin, G Vasconcellos, CZ TI Black Holes, Neutron Stars and Supernovae within the Induced Gravitational Collapse Paradigm for GRBs SO SECOND ICRANET CESAR LATTES MEETING: SUPERNOVAE, NEUTRON STARS AND BLACK HOLES SE AIP Conference Proceedings LA English DT Proceedings Paper CT 2nd ICRANet Cesar Lattes Meeting - Supernovae, Neutron Stars and Black Holes CY APR 13-22, 2015 CL Rio De Janeiro, BRAZIL SP Cent Brasileiro Pesquisas Fisicas, Coordenacao Aperfeicoamento Pessoal Nivel Super, European Union, Educ Audiovisual & Culture Execut Agcy, Espaco Ciencia Recife, Estacao Ciencias Auditorium Joao Pessoa, Fundacao Carlos Chagas Filho Amparo Pesquisa Estado Rio De Janeiro, Fundacao Planetario Cidade Rio De Janeiro, Inst Fed Educacao Ciencia Tecnologia Ceara, Int Ctr Relativist Astrophys Network, Univ Fed Paraiba, Univ Fed Pernambuco, Univ Fed Fluminense, ICTP, Ceara, ITA, IHEP, UNS, Univ Sapienza Rome, UNAM, INPE, UIS, Univ Nice Sophia Antipolis, State Comm Sci RA, NAS Armenia, FAPERJ, Consortium GARR, BSU, IHES, NASB, ASI, UNIFEI, Al Farabi Kazhak Natl Univ, Univ Fed Rio Grande Sul, Inst Fisica, Univ Estado Rio De Janeiro, UFF, UAM, CNR, UFSC, UFPE, INFN, IFCE, LeCosPA, UnB ID GAMMA-RAY BURSTS; PAIR-ELECTROMAGNETIC PULSE; BINARY-DRIVEN HYPERNOVAE; HUBBLE-SPACE-TELESCOPE; X-RAY; COSMOLOGICAL DISTANCES; IB/C SUPERNOVA; GENUINE SHORT; ERROR BOX; ACCRETION AB Recent progress in understanding of the Gamma-Ray Bursts, Supernovae and Black Holes is presented. C1 [Becerra, Laura; Bianco, Carlo Luciano; Cipolletta, Federico; Enderli, Maxime; Izzo, Luca; Kovacevic, Milos; Muccino, Marco; de Oliveira, Fernanda Gomes; Pisani, Giovanni Battista; Rueda, Jorge Armando; Ruffini, Remo; Wang, Yu] Univ Roma La Sapienza, Dip Fis, Ple Aldo Moro 5, I-00185 Rome, Italy. [Becerra, Laura; Bianco, Carlo Luciano; Cipolletta, Federico; Enderli, Maxime; Izzo, Luca; Kovacevic, Milos; Muccino, Marco; de Oliveira, Fernanda Gomes; Pisani, Giovanni Battista; Rueda, Jorge Armando; Ruffini, Remo; Wang, Yu] Univ Roma La Sapienza, ICRA, I-00185 Rome, Italy. [Becerra, Laura; Bianco, Carlo Luciano; Cipolletta, Federico; Izzo, Luca; de Lima, Rafael Camargo Rodrigues; Muccino, Marco; Rueda, Jorge Armando; Ruffini, Remo; Wang, Yu] ICRANet, I-65122 Pescara, Italy. [Enderli, Maxime; Kovacevic, Milos; de Oliveira, Fernanda Gomes; Pisani, Giovanni Battista; Ruffini, Remo] Univ Nice Sophia Antipolis, F-06189 Nice 2, France. [Penacchioni, Ana Virginia; Ruffini, Remo; Zaninoni, Elena] ICRANet Rio, CBPE, BR-22290180 Rio De Janeiro, RJ, Brazil. [Penacchioni, Ana Virginia] Inst Nacl Pesquisas Espaciais, BR-12227010 Sao Jose Dos Campos, SP, Brazil. [Fryer, Chris L.] Los Alamos Natl Lab, CCS 2, Los Alamos, NM 87545 USA. RP Becerra, L (reprint author), Univ Roma La Sapienza, Dip Fis, Ple Aldo Moro 5, I-00185 Rome, Italy.; Becerra, L (reprint author), Univ Roma La Sapienza, ICRA, I-00185 Rome, Italy. OI Cipolletta, Federico/0000-0001-7894-1028 NR 122 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0094-243X BN 978-0-7354-1340-5 J9 AIP CONF PROC PY 2015 VL 1693 AR 020002 DI 10.1063/1.4937180 PG 44 WC Astronomy & Astrophysics; Physics, Applied SC Astronomy & Astrophysics; Physics GA BE4DR UT WOS:000371596000002 ER PT S AU Coder, RD Linares, R Holzinger, MJ AF Coder, Ryan D. Linares, Richard Holzinger, Marcus J. BE Furfaro, R Cassotto, S Trask, A Zimmer, S TI IMPROVED MODELS FOR ATTITUDE ESTIMATION OF AGILE SPACE OBJECTS SO SPACEFLIGHT MECHANICS 2015, PTS I-III SE Advances in the Astronautical Sciences LA English DT Proceedings Paper CT 25th American-Astronautical-Society/American Institute of Aeronautics and Astronautics Space Flight Mechanics Meeting CY JAN 11-15, 2015 CL Williamsburg, VA SP Amer Astronaut Soc, Space Flight Mech Tech Comm, Amer Inst Aeronaut & Astronaut, Astrodynam Tech Comm ID ASTEROID LIGHTCURVE INVERSION; ATMOSPHERELESS BODIES; OPTIMIZATION METHODS; SHAPES AB Several innovations are introduced to ameliorate error in space object attitude estimation. A radiometric measurement noise model is developed to define the observation uncertainty in terms of optical, environmental, and sensor parameters. This reduces biases in the space objects' posterior state distributions. Additionally, a correlated angular rate dynamics model is adopted to decouple the effects of inertia and body torques for agile space objects. This novel dynamics model requires the adoption of marginalized particle filters to preserve computational tractability. The software framework is outlined, and simulated results are presented to demonstrate resultant reductions in agile space object attitude estimation error. C1 [Coder, Ryan D.; Holzinger, Marcus J.] Georgia Inst Technol, Sch Aerosp Engn, Atlanta, GA 30332 USA. [Linares, Richard] Los Alamos Natl Lab, Intelligence & Space Res, Los Alamos, NM 87545 USA. RP Coder, RD (reprint author), Georgia Inst Technol, Sch Aerosp Engn, Atlanta, GA 30332 USA. EM rcoder@gatech.edu; linares@lanl.gov; holzinger@gatech.edu NR 36 TC 0 Z9 0 U1 0 U2 0 PU UNIVELT INC PI SAN DIEGO PA PO BOX 28130, SAN DIEGO, CA 92128 USA SN 1081-6003 BN 978-0-87703-623-4 J9 ADV ASTRONAUT SCI PY 2015 VL 155 BP 3 EP 22 PN I-III PG 20 WC Engineering, Aerospace SC Engineering GA BE4FK UT WOS:000371647200001 ER PT S AU Linares, R Crassidis, JL AF Linares, Richard Crassidis, John L. BE Furfaro, R Cassotto, S Trask, A Zimmer, S TI GENERALIZED GAUSSIAN CUBATURE FOR NONLINEAR FILTERING SO SPACEFLIGHT MECHANICS 2015, PTS I-III SE Advances in the Astronautical Sciences LA English DT Proceedings Paper CT 25th American-Astronautical-Society (AAS)/American Institute of Aeronautics and Astronautics Space (AIAA) Flight Mechanics Meeting CY JAN 11-15, 2015 CL Williamsburg, VA SP Amer Astronaut Soc, Space Flight Mech Tech Comm, Amer Inst Aeronaut & Astronaut, Astrodynam Tech Comm ID POLYNOMIAL CHAOS; UNCERTAINTY PROPAGATION; COLLISION PROBABILITY; SYSTEMS; QUANTIFICATION; DESIGN; RULES AB A novel method for nonlinear filtering based on a generalized Gaussian cubature approach is shown. Specifically, a new point-based nonlinear filter is developed which is not based on one-dimensional quadrature rules, but rather uses multi-dimensional cubature rules for Gaussian distributions. The new generalized Gaussian cubature filter is not in general limited to odd-order degrees of accuracy, and provides a wider range of order of accuracy. The method requires the solution of a set of nonlinear equations for finding optimal cubature points, but these equations are only required to be solved once for each state dimensional and order of accuracy. This rule is also extended to anisotropic cases where the order of accuracy is not isotropic in dimension. This method allows for tuning of the cubature rules to develop problem-specific rules that are optimal for the given problem. The generalized Gaussian cubature filter is applied to benchmark problems in astrodynamics, and it is compared against existing nonlinear filtering methods. C1 [Linares, Richard] Los Alamos Natl Lab, Intelligence & Space Res, POB 1663, Los Alamos, NM 87544 USA. [Crassidis, John L.] SUNY Buffalo, Dept Mech & Aerosp Engn, Space Situat Awareness, Buffalo, NY 14260 USA. RP Linares, R (reprint author), Los Alamos Natl Lab, Intelligence & Space Res, POB 1663, Los Alamos, NM 87544 USA. EM linares@lanl.gov; johnc@buffalo.edu NR 40 TC 0 Z9 0 U1 0 U2 0 PU UNIVELT INC PI SAN DIEGO PA PO BOX 28130, SAN DIEGO, CA 92128 USA SN 1081-6003 BN 978-0-87703-623-4 J9 ADV ASTRONAUT SCI PY 2015 VL 155 BP 1109 EP 1128 PN I-III PG 20 WC Engineering, Aerospace SC Engineering GA BE4FK UT WOS:000371647200067 ER PT S AU Vittaldev, V Linares, R Russell, RP AF Vittaldev, Vivek Linares, Richard Russell, Ryan P. BE Furfaro, R Cassotto, S Trask, A Zimmer, S TI SPACECRAFT UNCERTAINTY PROPAGATION USING GAUSSIAN MIXTURE MODELS AND POLYNOMIAL CHAOS EXPANSIONS SO SPACEFLIGHT MECHANICS 2015, PTS I-III SE Advances in the Astronautical Sciences LA English DT Proceedings Paper CT 25th American-Astronautical-Society (AAS)/American Institute of Aeronautics and Astronautics Space (AIAA) Flight Mechanics Meeting CY JAN 11-15, 2015 CL Williamsburg, VA SP Amer Astronaut Soc, Space Flight Mech Tech Comm, Amer Inst Aeronaut & Astronaut, Astrodynam Tech Comm ID ORBIT UNCERTAINTY; COLLISION PROBABILITY; SYSTEMS; QUANTIFICATION; DESIGN AB Polynomial Chaos Expansion (PCE) and Gaussian Mixture Models (GMM) are combined in a hybrid fashion to quantify state uncertainty for spacecraft. The PCE approach models the uncertainty by performing an expansion using orthogonal polynomials (OPs). The accuracy of PCE for a given problem can be improved by increasing the order of the OP expansion. Due to the "curse of dimensionality" the number of terms in the OP expansion increases exponentially with dimensionality of the problem, thereby reducing the effectiveness of the PCE approach for problems of moderately high dimensionality. Including a GMM with the PCE (GMM-PC) is shown to reduce the overall order required to achieve a desired accuracy. The initial distribution is converted into a GMM, and PCE is used to propagate each of the elements. Splitting the initial distribution into a GMM reduces the size of the covariance associated with each element and therefore, lower order polynomials can be used. The GMM-PC effectively reduces the function evaluations required for accurately describing a non-Gaussian distribution that results from the propagation of a state with an initial Gaussian distribution through a nonlinear function. Several examples of state uncertainty are propagated using GMM-PC. The resulting distributions are shown to efficiently capture shape and skewness. C1 [Vittaldev, Vivek; Russell, Ryan P.] Univ Texas Austin, Dept Aerosp Engn & Engn Mech, Austin, TX 78712 USA. [Linares, Richard] Los Alamos Natl Lab, Space Sci & Applicat, ISR 1, Los Alamos, NM 87545 USA. RP Vittaldev, V (reprint author), Univ Texas Austin, Dept Aerosp Engn & Engn Mech, Austin, TX 78712 USA. NR 47 TC 0 Z9 0 U1 0 U2 0 PU UNIVELT INC PI SAN DIEGO PA PO BOX 28130, SAN DIEGO, CA 92128 USA SN 1081-6003 BN 978-0-87703-623-4 J9 ADV ASTRONAUT SCI PY 2015 VL 155 BP 3445 EP 3463 PN I-III PG 19 WC Engineering, Aerospace SC Engineering GA BE4FK UT WOS:000371647200206 ER PT S AU Cuesta, C Abgrall, N Arnquist, IJ Avignone, FT Baldenegro-Baffera, CX Barabash, AS Bertrand, FE Bradley, AW Brudanin, V Busch, M Buuck, M Byram, D Caldwell, AS Chan, YD Christofferson, CD Chu, PH Detwiler, JA Efremenko, Y Ejiri, H Elliott, SR Galindo-Uribarrie, A Gilliss, T Giovanetti, GK Goett, J Green, MP Gruszko, J Guinn, IS Guiseppe, VE Henning, R Hoppe, EW Howard, S Howe, MA Jasinski, BR Keeter, KJ Kidd, MF Konovalov, SI Kouzes, RT LaFerriere, BD Leon, J MacMullin, J Martin, RD Massarczyk, R Meijer, SJ Mertens, S Orrell, JL O'Shaughnessy, C Poon, AWP Radford, DC Rager, J Rielage, K Robertson, RGH Romero-Romero, E Shanks, B Shirchenko, M Snyder, N Suriano, AM Tedeschi, D Trimble, JE Varner, RL Vasilyev, S Vetterr, K Vorren, K White, BR Wilkerson, JF Wiseman, C Xu, W Yakushev, E Yu, CH Yumatov, V Zhitnikov, I AF Cuesta, C. Abgrall, N. Arnquist, I. J. Avignone, F. T., III Baldenegro-Baffera, C. X. Barabash, A. S. Bertrand, F. E. Bradley, A. W. Brudanin, V. Busch, M. Buuck, M. Byram, D. Caldwell, A. S. Chan, Y. -D. Christofferson, C. D. Chu, P. -H. Detwiler, J. A. Efremenko, Yu. Ejiri, H. Elliott, S. R. Galindo-Uribarrie, A. Gilliss, T. Giovanetti, G. K. Goett, J. Green, M. P. Gruszko, J. Guinn, I. S. Guiseppe, V. E. Henning, R. Hoppe, E. W. Howard, S. Howe, M. A. Jasinski, B. R. Keeter, K. J. Kidd, M. F. Konovalov, S. I. Kouzes, R. T. LaFerriere, B. D. Leon, J. MacMullin, J. Martin, R. D. Massarczyk, R. Meijer, S. J. Mertens, S. Orrell, J. L. O'Shaughnessy, C. Poon, A. W. P. Radford, D. C. Rager, J. Rielage, K. Robertson, R. G. H. Romero-Romero, E. Shanks, B. Shirchenko, M. Snyder, N. Suriano, A. M. Tedeschi, D. Trimble, J. E. Varner, R. L. Vasilyev, S. Vetterr, K. Vorren, K. White, B. R. Wilkerson, J. F. Wiseman, C. Xu, W. Yakushev, E. Yu, C. - H. Yumatov, V. Zhitnikov, I. BE Civitarese, O Steki, I Suhonen, J TI Status of the MAJORANA DEMONSTRATOR SO WORKSHOP ON CALCULATION OF DOUBLE-BETA-DECAY MATRIX ELEMENTS (MEDEX15) SE AIP Conference Proceedings LA English DT Proceedings Paper CT 10th Workshop on Calculation of Double-Beta-Decay Matrix Elements (MEDEX) CY JUN 09-12, 2015 CL Prague, CZECH REPUBLIC DE neutrinoless double-beta decay; germanium detector; Majorana neutrino mass ID NEUTRINO MASS; DECAY AB The MAJORANA Collaboration is constructing the MAJORANA DEMONSTRATOR, an ultra-low background, modular, HPGe detector array with a mass of 44-kg (29 kg Ge-76 and 15 kg Ge-nat) to search for neutrinoless double beta decay in Ge-76. The next generation of tonne-scale Ge-based neutrinoless double beta decay searches will probe the neutrino mass scale in the inverted-hierarchy region. The MAJORANA DEMONSTRATOR is envisioned to demonstrate a path forward to achieve a background rate at or below 1 count/tonne/year in the 4 keV region of interest around the Q-value of 2039 keV. The MAJO-RANA DEMONSTRATOR follows a modular implementation to be easily scalable to the next generation experiment. First, the prototype module was assembled; it has been continuously taking data from July 2014 to June 2015. Second, Module 1 with more than half of the total enriched detectors and some natural detectors has been assembled and it is being commissioned. Finally, the assembly of Module 2, which will complete MAJORANA DEMONSTRATOR, is already in progress. C1 [Cuesta, C.; Buuck, M.; Detwiler, J. A.; Gruszko, J.; Guinn, I. S.; Leon, J.; Robertson, R. G. H.] Univ Washington, Ctr Expt Nucl Phys & Astrophys, Seattle, WA 98195 USA. [Cuesta, C.; Buuck, M.; Detwiler, J. A.; Gruszko, J.; Guinn, I. S.; Leon, J.; Robertson, R. G. H.] Univ Washington, Dept Phys, Seattle, WA 98195 USA. [Abgrall, N.; Bradley, A. W.; Chan, Y. -D.; Mertens, S.; Poon, A. W. P.; Vetterr, K.] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Nucl Sci, 1 Cyclotron Rd, Berkeley, CA 94720 USA. [Arnquist, I. J.; Hoppe, E. W.; Kouzes, R. T.; LaFerriere, B. D.; Orrell, J. L.] Pacific NW Natl Lab, Richland, WA 99352 USA. [Avignone, F. T., III; Guiseppe, V. E.; Tedeschi, D.; Wiseman, C.] Univ S Carolina, Dept Phys & Astron, Columbia, SC 29208 USA. [Avignone, F. T., III; Baldenegro-Baffera, C. X.; Bertrand, F. E.; Galindo-Uribarrie, A.; Green, M. P.; Radford, D. C.; Romero-Romero, E.; Varner, R. L.; White, B. R.; Wilkerson, J. F.; Yu, C. - H.] Oak Ridge Natl Lab, Oak Ridge, TN USA. [Barabash, A. S.; Konovalov, S. I.; Yumatov, V.] Inst Theoret & Expt Phys, Moscow 117259, Russia. [Brudanin, V.; Shirchenko, M.; Vasilyev, S.; Yakushev, E.; Zhitnikov, I.] Joint Inst Nucl Res, Dubna, Russia. [Busch, M.] Duke Univ, Dept Phys, Durham, NC 27706 USA. [Busch, M.; Gilliss, T.; Giovanetti, G. K.; Henning, R.; Howe, M. A.; MacMullin, J.; Meijer, S. J.; O'Shaughnessy, C.; Rager, J.; Shanks, B.; Trimble, J. E.; Vorren, K.; Wilkerson, J. F.] Triangle Univ Nucl Lab, Durham, NC 27706 USA. [Byram, D.; Jasinski, B. R.; Martin, R. D.; Snyder, N.] Univ S Dakota, Dept Phys, Vermillion, SD 57069 USA. [Caldwell, A. S.; Christofferson, C. D.; Howard, S.; Suriano, A. M.] South Dakota Sch Mines & Technol, Rapid City, SD USA. [Efremenko, Yu.; Romero-Romero, E.] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA. [Ejiri, H.] Osaka Univ, Nucl Phys Res Ctr, Osaka, Japan. [Ejiri, H.] Osaka Univ, Dept Phys, Osaka, Japan. [Gilliss, T.; Giovanetti, G. K.; Henning, R.; Howe, M. A.; MacMullin, J.; Meijer, S. J.; O'Shaughnessy, C.; Rager, J.; Shanks, B.; Trimble, J. E.; Vorren, K.; Wilkerson, J. F.] Univ N Carolina, Dept Phys & Astron, Chapel Hill, NC USA. [Chu, P. -H.; Elliott, S. R.; Goett, J.; Massarczyk, R.; Rielage, K.; Xu, W.] Los Alamos Natl Lab, Los Alamos, NM USA. [Keeter, K. J.] Black Hills State Univ, Dept Phys, Spearlish, SD USA. [Kidd, M. F.] Tennessee Technol Univ, Cookeville, TN USA. [Vetterr, K.] Univ Calif Berkeley, Dept Nucl Engn, Berkeley, CA 94720 USA. RP Cuesta, C (reprint author), Univ Washington, Ctr Expt Nucl Phys & Astrophys, Seattle, WA 98195 USA. RI Barabash, Alexander/S-8851-2016; Cuesta, Clara/L-5466-2014; OI Cuesta, Clara/0000-0003-1190-7233; Chu, Pinghan/0000-0003-1372-2910; Rielage, Keith/0000-0002-7392-7152 NR 17 TC 2 Z9 2 U1 1 U2 1 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0094-243X BN 978-0-7354-1333-7 J9 AIP CONF PROC PY 2015 VL 1686 AR 020005 DI 10.1063/1.4934894 PG 4 WC Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4KB UT WOS:000371817300005 ER PT S AU Gironi, L Alduino, C Alfonso, K Artusa, DR Avignone, FT Azzolini, O Balata, M Banks, TI Bari, G Beeman, JW Bellini, F Bersani, A Biassoni, M Brofferio, C Bucci, C Camacho, A Caminata, A Canonica, L Cao, XG Capelli, S Cappelli, L Carbone, L Cardani, L Carniti, P Casali, N Cassina, L Chiesa, D Chott, N Clemenza, M Copello, S Cosmelli, C Cremonesi, O Creswick, RJ Cushman, JS Dafinei, I Dally, A Davis, CJ Dell'Oro, S Deninno, MM Di Domizio, S Di Vacri, ML Drobizhev, A Fang, DQ Faverzani, M Fernandes, G Ferri, E Ferroni, F Fiorini, E Franceschi, MA Freedman, SJ Fujikawa, BK Giachero, A Giuliani, A Gorla, P Gotti, C Gutierrez, TD Haller, EE Han, K Hansen, E Heeger, KM Hennings-Yeomans, R Hickerson, KP Huang, HZ Kadel, R Keppel, G Kolomensky, YG Ligi, C Lim, KE Liu, X Ma, YG Maino, M Martinez, M Maruyama, RH Mei, Y Moggi, N Morganti, S Napolitano, T Nisi, S Nones, C Norman, EB Nucciotti, A O'Donnell, T Orio, F Orlandi, D Ouellet, JL Pagliarone, CE Pallavicini, M Palmieri, V Pattavina, L Pavan, M Pessina, G Pettinacci, V Piperno, G Pira, C Pirro, S Pozzi, S Previtali, E Rosenfeld, C Rusconi, C Sala, E Sangiorgio, S Santone, D Scielzo, ND Sisti, M Smith, AR Taffarello, L Tenconi, M Terranova, F Tomei, C Trentalange, S Ventura, G Vignati, M Wagaarachchi, SL Wang, BS Wang, HW Wielgus, L Wilson, J Winslow, LA Wise, T Woodcraft, A Zanotti, L Zarra, C Zhang, GQ Zhu, BX Zimmermann, S Zucchelli, S AF Gironi, L. Alduino, C. Alfonso, K. Artusa, D. R. Avignone, F. T., III Azzolini, O. Balata, M. Banks, T. I. Bari, G. Beeman, J. W. Bellini, F. Bersani, A. Biassoni, M. Brofferio, C. Bucci, C. Camacho, A. Caminata, A. Canonica, L. Cao, X. G. Capelli, S. Cappelli, L. Carbone, L. Cardani, L. Carniti, P. Casali, N. Cassina, L. Chiesa, D. Chott, N. Clemenza, M. Copello, S. Cosmelli, C. Cremonesi, O. Creswick, R. J. Cushman, J. S. Dafinei, I. Dally, A. Davis, C. J. Dell'Oro, S. Deninno, M. M. Di Domizio, S. Di Vacri, M. L. Drobizhev, A. Fang, D. Q. Faverzani, M. Fernandes, G. Ferri, E. Ferroni, F. Fiorini, E. Franceschi, M. A. Freedman, S. J. Fujikawa, B. K. Giachero, A. Giuliani, A. Gorla, P. Gotti, C. Gutierrez, T. D. Haller, E. E. Han, K. Hansen, E. Heeger, K. M. Hennings-Yeomans, R. Hickerson, K. P. Huang, H. Z. Kadel, R. Keppel, G. Kolomensky, Yu. G. Ligi, C. Lim, K. E. Liu, X. Ma, Y. G. Maino, M. Martinez, M. Maruyama, R. H. Mei, Y. Moggi, N. Morganti, S. Napolitano, T. Nisi, S. Nones, C. Norman, E. B. Nucciotti, A. O'Donnell, T. Orio, F. Orlandi, D. Ouellet, J. L. Pagliarone, C. E. Pallavicini, M. Palmieri, V. Pattavina, L. Pavan, M. Pessina, G. Pettinacci, V. Piperno, G. Pira, C. Pirro, S. Pozzi, S. Previtali, E. Rosenfeld, C. Rusconi, C. Sala, E. Sangiorgio, S. Santone, D. Scielzo, N. D. Sisti, M. Smith, A. R. Taffarello, L. Tenconi, M. Terranova, F. Tomei, C. Trentalange, S. Ventura, G. Vignati, M. Wagaarachchi, S. L. Wang, B. S. Wang, H. W. Wielgus, L. Wilson, J. Winslow, L. A. Wise, T. Woodcraft, A. Zanotti, L. Zarra, C. Zhang, G. Q. Zhu, B. X. Zimmermann, S. Zucchelli, S. BE Civitarese, O Steki, I Suhonen, J TI First neutrinoless double beta decay results from CUORE-0 SO WORKSHOP ON CALCULATION OF DOUBLE-BETA-DECAY MATRIX ELEMENTS (MEDEX15) SE AIP Conference Proceedings LA English DT Proceedings Paper CT 10th Workshop on Calculation of Double-Beta-Decay Matrix Elements (MEDEX) CY JUN 09-12, 2015 CL Prague, CZECH REPUBLIC AB The CUORE-0 experiment, a 52 bolometer array searching for neutrinoless double beta decay from Te-130, has started taking data in spring 2013 underground at the Laboratori Nazionali del Gran Sasso (LNGS). The excellent results obtained in terms of energy resolution and background level allowed this experiment to reach the sensitivity of Cuoricino in approximately half the runtime. Combining CUORE-0 data (9.8 kg.yr exposure of Te-130) with the 19.75 kg.yr exposure of the Cuoricino experiment, we obtain the most stringent limit to date on the half-life of this isotope (T-1/2 > 4.0 x 10(24) yr). In this article, we review the results from CUORE-0 and discuss the status and the physics potential of CUORE, a 19 times larger bolometer array that plans to begin operations by end of this year. C1 [Gironi, L.; Biassoni, M.; Brofferio, C.; Capelli, S.; Carniti, P.; Cassina, L.; Chiesa, D.; Clemenza, M.; Faverzani, M.; Ferri, E.; Fiorini, E.; Giachero, A.; Gotti, C.; Maino, M.; Nucciotti, A.; Pavan, M.; Pozzi, S.; Sala, E.; Sisti, M.; Terranova, F.; Zanotti, L.] Univ Milano Bicocca, Dipartimento Fis, I-20126 Milan, Italy. [Gironi, L.; Biassoni, M.; Brofferio, C.; Capelli, S.; Carbone, L.; Carniti, P.; Cassina, L.; Chiesa, D.; Clemenza, M.; Cremonesi, O.; Faverzani, M.; Ferri, E.; Fiorini, E.; Giachero, A.; Gotti, C.; Maino, M.; Nucciotti, A.; Pavan, M.; Pessina, G.; Pozzi, S.; Previtali, E.; Rusconi, C.; Sala, E.; Sisti, M.; Terranova, F.; Zanotti, L.] Ist Nazl Fis Nucl, Sez Milano Bicocca, I-20126 Milan, Italy. [Alduino, C.; Artusa, D. R.; Avignone, F. T., III; Chott, N.; Creswick, R. J.; Rosenfeld, C.; Wilson, J.] Univ S Carolina, Dept Phys & Astron, Columbia, SC 29208 USA. [Alfonso, K.; Hansen, E.; Hickerson, K. P.; Huang, H. Z.; Liu, X.; Trentalange, S.; Zhu, B. X.] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA. [Artusa, D. R.; Balata, M.; Bucci, C.; Canonica, L.; Cappelli, L.; Dell'Oro, S.; Di Vacri, M. L.; Gorla, P.; Nisi, S.; Orlandi, D.; Pagliarone, C. E.; Pattavina, L.; Pirro, S.; Santone, D.; Zarra, C.] Ist Nazl Fis Nucl, Lab Nazl Gran Sasso, I-67010 Laquila, Italy. [Azzolini, O.; Camacho, A.; Keppel, G.; Palmieri, V.; Pira, C.] Ist Nazl Fis Nucl, Lab Nazl Legnaro, I-35020 Padua, Italy. [Banks, T. I.; Drobizhev, A.; Freedman, S. J.; Hennings-Yeomans, R.; Kolomensky, Yu. G.; O'Donnell, T.; Ouellet, J. L.; Wagaarachchi, S. L.] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. [Banks, T. I.; Drobizhev, A.; Freedman, S. J.; Fujikawa, B. K.; Han, K.; Hennings-Yeomans, R.; Mei, Y.; O'Donnell, T.; Ouellet, J. L.; Smith, A. R.; Wagaarachchi, S. L.] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Nucl Sci, Berkeley, CA 94720 USA. [Bari, G.; Deninno, M. M.; Moggi, N.; Zucchelli, S.] Ist Nazl Fis Nucl, Sez Bologna, I-40127 Bologna, Italy. [Beeman, J. W.; Haller, E. E.] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA. [Bellini, F.; Cardani, L.; Casali, N.; Cosmelli, C.; Ferroni, F.; Martinez, M.; Piperno, G.] Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy. [Bellini, F.; Cardani, L.; Casali, N.; Cosmelli, C.; Dafinei, I.; Ferroni, F.; Martinez, M.; Morganti, S.; Orio, F.; Pettinacci, V.; Piperno, G.; Tomei, C.; Vignati, M.] Ist Nazl Fis Nucl, Sez Roma, I-00185 Rome, Italy. [Bersani, A.; Caminata, A.; Cappelli, L.; Di Domizio, S.; Fernandes, G.; Pallavicini, M.] Ist Nazl Fis Nucl, Sez Genova, I-16146 Genoa, Italy. [Cao, X. G.; Fang, D. Q.; Ma, Y. G.; Wang, H. W.; Zhang, G. Q.] Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201800, Peoples R China. [Cappelli, L.; Pagliarone, C. E.] Univ Cassino & Lazio Merid, Dipartimento Ingn Civile & Meccan, I-03043 Cassino, Italy. [Copello, S.; Di Domizio, S.; Fernandes, G.; Pallavicini, M.] Univ Genoa, Dipartimento Fis, I-16146 Genoa, Italy. [Cushman, J. S.; Davis, C. J.; Han, K.; Heeger, K. M.; Lim, K. E.; Maruyama, R. H.; Wise, T.] Yale Univ, Dept Phys, New Haven, CT 06520 USA. [Dally, A.; Wielgus, L.; Wise, T.] Univ Wisconsin, Dept Phys, Madison, WI 53706 USA. [Dell'Oro, S.] Ist Nazl Fis Nucl, Gran Sasso Sci Inst, I-67100 Laquila, Italy. [Di Vacri, M. L.; Santone, D.] Univ Aquila, Dipartimento Sci Fis & Chim, I-67100 Laquila, Italy. [Franceschi, M. A.; Ligi, C.; Napolitano, T.] Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Rome, Italy. [Giuliani, A.; Tenconi, M.] Ctr Spectrometrie Nucl & Spectrometrie Masse, F-91405 Orsay, France. [Gutierrez, T. D.] Calif Polytech State Univ San Luis Obispo, Dept Phys, San Luis Obispo, CA 93407 USA. [Haller, E. E.] Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA. [Hansen, E.; Ouellet, J. L.; Winslow, L. A.] MIT, Cambridge, MA 02139 USA. [Kadel, R.; Kolomensky, Yu. G.] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Phys, Berkeley, CA 94720 USA. [Martinez, M.] Univ Zaragoza, Lab Fis Nucl & Astroparticulas, E-50009 Zaragoza, Spain. [Moggi, N.] Univ Bologna, Dipartimento Sci Qualita Vita, Alma Mater Studiorum, I-47921 Bologna, Italy. [Nones, C.] CEA Saclay, Serv Phys Particules, F-91191 Gif Sur Yvette, France. [Norman, E. B.; Sangiorgio, S.; Scielzo, N. D.; Wang, B. S.] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. [Norman, E. B.; Wang, B. S.] Univ Calif Berkeley, Dept Nucl Engn, Berkeley, CA 94720 USA. [Taffarello, L.] Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy. [Ventura, G.] Univ Florence, Dipartimento Fis, I-50125 Florence, Italy. [Ventura, G.] Ist Nazl Fis Nucl, Sez Firenze, I-50125 Florence, Italy. [Woodcraft, A.] Univ Edinburgh, Inst Astron, SUPA, Edinburgh EH9 3HJ, Midlothian, Scotland. [Zimmermann, S.] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Engn, Berkeley, CA 94720 USA. [Zucchelli, S.] Univ Bologna, Dipartimento Fis & Astron, Alma Mater Studiorum, I-40127 Bologna, Italy. RP Gironi, L (reprint author), Univ Milano Bicocca, Dipartimento Fis, I-20126 Milan, Italy. RI Nucciotti, Angelo/I-8888-2012; Casali, Nicola/C-9475-2017; Giachero, Andrea/I-1081-2013; Chiesa, Davide/H-7240-2014; Vignati, Marco/H-1684-2013; Gironi, Luca/P-2860-2016; Pattavina, Luca/I-7498-2015; capelli, silvia/G-5168-2012; Ma, Yu-Gang/M-8122-2013 OI Pozzi, Stefano/0000-0003-2986-1990; Nucciotti, Angelo/0000-0002-8458-1556; Casali, Nicola/0000-0003-3669-8247; pavan, maura/0000-0002-9723-7834; Giachero, Andrea/0000-0003-0493-695X; Chiesa, Davide/0000-0003-1978-1727; Vignati, Marco/0000-0002-8945-1128; Gironi, Luca/0000-0003-2019-0967; Pattavina, Luca/0000-0003-4192-849X; capelli, silvia/0000-0002-0300-2752; Ma, Yu-Gang/0000-0002-0233-9900 NR 6 TC 1 Z9 1 U1 2 U2 9 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0094-243X BN 978-0-7354-1333-7 J9 AIP CONF PROC PY 2015 VL 1686 AR 020011 DI 10.1063/1.4934900 PG 4 WC Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4KB UT WOS:000371817300011 ER PT S AU Cherdack, D Worcester, E AF Cherdack, Daniel Worcester, Elizabeth BE Szczerbinska, B Worcester, E TI Summary of Long-Baseline Systematics Session at CETUP*2014 SO WORKSHOP ON NEUTRINO INTERACTIONS, SYSTEMATIC UNCERTAINTIES AND NEAR DETECTOR PHYSICS (CETUP* 2014) SE AIP Conference Proceedings LA English DT Proceedings Paper CT 4th Workshop on Neutrino Interactions, Systematic Uncertainties and Near Detector Physics (CETUP) CY JUL 10-31, 2014 CL Lead, SD SP Black Hills Vis, John T Vucurevich Fdn, S Dakota Board Regents, S Dakota Sci & Technol Author, Chamber Commerce Deadwood, S Dakota Governors Off Econ Dev, Dakota Sci, Dakota State Univ DE neutrino oscillation; systematic uncertainty ID SCATTERING; SIMULATION; GENERATOR; ENERGIES; NUCLEI; TPC AB A session studying systematics in long-baseline neutrino oscillation physics was held July 14-18, 2014 as part of CETUP* 2014. Systematic effects from flux normalization and modeling, modeling of cross sections and nuclear interactions, and far detector effects were addressed. Experts presented the capabilities of existing and planned tools. A program of study to determine estimates of and requirements for the size of these effects was designed. This document summarizes the results of the CETUP* systematics workshop and the current status of systematic uncertainty studies in long-baseline neutrino oscillation measurements. C1 [Cherdack, Daniel] Colorado State Univ, Dept Phys, 1875 Campus Delivery, Ft Collins, CO 80523 USA. [Worcester, Elizabeth] Brookhaven Natl Lab, POB 5000, Upton, NY 11973 USA. RP Cherdack, D (reprint author), Colorado State Univ, Dept Phys, 1875 Campus Delivery, Ft Collins, CO 80523 USA. NR 31 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0094-243X BN 978-0-7354-1327-6 J9 AIP CONF PROC PY 2015 VL 1680 AR 030001 DI 10.1063/1.4931873 PG 10 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4KR UT WOS:000371825300014 ER PT S AU Lebrun, PLG Hylen, J Marchionni, A Fields, L Bashyal, A Park, S Watson, B AF Lebrun, Paul L. G. Hylen, James Marchionni, Alberto Fields, Laura Bashyal, Amit Park, Seongtae Watson, Blake BE Szczerbinska, B Worcester, E TI On LBNE Neutrino Flux Systematic Uncertainties SO WORKSHOP ON NEUTRINO INTERACTIONS, SYSTEMATIC UNCERTAINTIES AND NEAR DETECTOR PHYSICS (CETUP* 2014) SE AIP Conference Proceedings LA English DT Proceedings Paper CT 4th Workshop on Neutrino Interactions, Systematic Uncertainties and Near Detector Physics (CETUP) CY JUL 10-31, 2014 CL Lead, SD SP Black Hills Vis, John T Vucurevich Fdn, S Dakota Board Regents, S Dakota Sci & Technol Author, Chamber Commerce Deadwood, S Dakota Governors Off Econ Dev, Dakota Sci, Dakota State Univ DE Neutrino Beam Simulation AB The systematic uncertainties in the neutrino flux of the Long-Baseline Neutrino Experiment, due to alignment uncertanties and tolerances of the neutrino beamline components, are estimated. In particular residual systematics are evaluated in the determination of the neutrino flux at the far detector, assuming that the experiment will be equipped with a near detector with the same target material of the far detector, thereby canceling most of the uncertainties from hadroproduction and neutrino cross sections. This calculation is based on a detailed Geant4-based model of the neutrino beam line that includes the target, two focusing horns, the decay pipe and ancillary items, such as shielding. C1 [Lebrun, Paul L. G.; Hylen, James; Marchionni, Alberto] Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. [Fields, Laura] Northwestern Univ, Evanston, IL 60208 USA. [Bashyal, Amit; Park, Seongtae; Watson, Blake] Univ Texas Arlington, Arlington, TX 76019 USA. RP Lebrun, PLG (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. OI Marchionni, Alberto/0000-0003-3039-9537 NR 5 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0094-243X BN 978-0-7354-1327-6 J9 AIP CONF PROC PY 2015 VL 1680 AR 030004 DI 10.1063/1.4931876 PG 5 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4KR UT WOS:000371825300017 ER PT S AU Louis, WC AF Louis, William C. BE Szczerbinska, B Worcester, E TI The Effect of Short-Baseline Neutrino Oscillations on LBNE SO WORKSHOP ON NEUTRINO INTERACTIONS, SYSTEMATIC UNCERTAINTIES AND NEAR DETECTOR PHYSICS (CETUP* 2014) SE AIP Conference Proceedings LA English DT Proceedings Paper CT 4th Workshop on Neutrino Interactions, Systematic Uncertainties and Near Detector Physics (CETUP) CY JUL 10-31, 2014 CL Lead, SD SP Black Hills Vis, John T Vucurevich Fdn, S Dakota Board Regents, S Dakota Sci & Technol Author, Chamber Commerce Deadwood, S Dakota Governors Off Econ Dev, Dakota Sci, Dakota State Univ DE neutrino oscillations AB Short-baseline neutrino oscillations can have a relatively big effect on long-baseline oscillations, due to the cross terms that arise from multiple mass scales. The existing short-baseline anomalies suggest that short-baseline oscillations can affect the nu mu -> nu(e) appearance probabilities by up to 20-40%, depending on the values of the CP-violating parameters. C1 [Louis, William C.] Los Alamos Natl Lab, Div Phys, Los Alamos, NM 87545 USA. RP Louis, WC (reprint author), Los Alamos Natl Lab, Div Phys, Los Alamos, NM 87545 USA. NR 7 TC 0 Z9 0 U1 1 U2 1 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0094-243X BN 978-0-7354-1327-6 J9 AIP CONF PROC PY 2015 VL 1680 AR 040003 DI 10.1063/1.4931879 PG 6 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BE4KR UT WOS:000371825300020 ER PT S AU Golubov, SI Barashev, AV Stoller, RE Singh, BN AF Golubov, Stanislav I. Barashev, Alexander V. Stoller, Roger E. Singh, Bachu N. BE Comstock, R Barberis, P TI Breakthrough in Understanding Radiation Growth of Zirconium SO ZIRCONIUM IN THE NUCLEAR INDUSTRY SE American Society for Testing and Materials Selected Technical Papers LA English DT Proceedings Paper CT 17th International Symposium on Zirconium in the Nuclear Industry CY FEB 03-07, 2013 CL Hyderabad, INDIA SP ASTM Int, Comm B10 React & Refractory Met & Alloys, ASTM Int, Subcommittee B10 02 Zirconium & Hafnium DE neutron irradiation; zirconium; radiation growth; theory ID IRRADIATION GROWTH; SINGLE-CRYSTALS; ALPHA-ZIRCONIUM; DISLOCATION LOOPS; 1ST PRINCIPLES; DEFORMATION; BIAS; VACANCY; DYNAMICS; METALS AB The efforts of many scientists for more than a half of a century have resulted in a substantial understanding of the response of Zr-based materials to irradiation. However, the models of radiation growth proposed to date have not played a decisive role in creating radiation-resistant materials and cannot predict strain rates at high irradiation doses. The main reason for this is the common assumption that, regardless of the incident particle mass and energy, the primary damage consists of single vacancies and self-interstitial atoms (SIAs), both diffusing three-dimensionally. Thus, the models ignore the distinguishing features of the damage production in displacement cascades during fast-particle, e.g., neutron, irradiation; namely, the intra-cascade clustering of vacancies and SIAs and one-dimensional diffusion of SIA clusters. Over the last twenty years or so, the production bias model (PBM) has been developed, which accounts for these features and explains many observations in cubic crystals. The cascades in hcp crystals are found to be similar to those in cubic crystals; hence one can expect that the PBM will provide a realistic framework for the hcp metals as well. It is shown in this paper that it reproduces all the growth stages observed in annealed materials under neutron irradiation, such as the high strain rate at low, strain saturation at intermediate, and breakaway growth at relatively high doses. It accounts for the striking observations of negative strains in prismatic directions and co-existence of vacancy-and interstitial-type prismatic loops, which have never been explained before. It reveals the role of cold work in the radiation growth behavior and the reasons for the alignment of basal vacancy-type loops along the basal planes. The critical parameters determining the high-dose behavior are revealed and the maximum growth rate is estimated. C1 [Golubov, Stanislav I.; Barashev, Alexander V.; Stoller, Roger E.] Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA. [Barashev, Alexander V.] Univ Tennessee, Dept Mat Sci & Engn, Ctr Mat Proc, Knoxville, TN 37996 USA. [Singh, Bachu N.] Tech Univ Denmark, Riso Natl Lab, Mat Res Dept, DK-4000 Roskilde, Denmark. RP Golubov, SI (reprint author), Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA. EM golubovsi@ornl.gov NR 32 TC 0 Z9 0 U1 2 U2 4 PU ASTM INTERNATIONAL PI WEST CONSHOHOCKEN PA 100 BARR HARBOR DRIVE, PO BOX C700, WEST CONSHOHOCKEN, PA 19428-2959 USA SN 0066-0558 BN 978-0-8031-7529-7 J9 AM SOC TEST MATER PY 2015 VL 1543 BP 729 EP 758 DI 10.1520/STP154320130043 PG 30 WC Materials Science, Characterization & Testing; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA BE4GG UT WOS:000371681000027 ER PT S AU Colas, K Motta, A Daymond, MR Almer, J AF Colas, Kimberly Motta, Arthur Daymond, Mark R. Almer, Jonathan BE Comstock, R Barberis, P TI Mechanisms of Hydride Reorientation in Zircaloy-4 Studied in Situ SO ZIRCONIUM IN THE NUCLEAR INDUSTRY SE American Society for Testing and Materials Special Technical Publications LA English DT Proceedings Paper CT 17th International Symposium on Zirconium in the Nuclear Industry CY FEB 03-07, 2013 CL Hyderabad, INDIA SP ASTM Int, Comm B10 React & Refractory Met & Alloys, ASTM Int, Subcommittee B10 02 Zirconium & Hafnium DE zirconiumhydrides; reorientation; synchrotron x-ray diffraction ID ZIRCONIUM HYDRIDE; PRECIPITATION; STRESS; DISSOLUTION; BEHAVIOR; NIOBIUM AB Zirconium hydride platelet reorientation in fuel cladding during dry storage and transportation of spent nuclear fuel is an important technological issue. Using an in situ x-ray synchrotron diffraction technique, the detailed kinetics of hydride precipitation and reorientation can be directly determined while the specimen is under stress and at temperature. Hydrided Zircaloy-4 dogbone sheet samples were submitted to various thermo-mechanical schedules, while x-ray diffraction data was continuously recorded. Post-test metallography showed that nearly full hydride reorientation was achieved when the applied stress was above 210 MPa. In general, repeated thermal cycling above the terminal solid solubility temperature increased both the reoriented hydride fraction and the connectivity of the reoriented hydrides. The dissolution and precipitation temperatures were determined directly from the hydride diffraction signal. The diffraction signature of reoriented hydrides is different than that of in-plane hydrides. During cooling under stress, the precipitation of reoriented hydrides occurs at lower temperatures than the precipitation of in-plane hydrides, suggesting that applied stress suppresses the precipitation of in-plane hydrides. The analysis of the elastic strains determined by the shift in position of hydride and zirconium diffraction peaks allowed following of the early stages of hydride precipitation. Hydride particles were observed to start to nucleate with highly compressive strain. These compressive strains quickly relax to smaller compressive strains within 30 degrees C of the onset of precipitation. After about half of the overall hydride volume fraction is precipitated, hydride strains follow the thermal contraction of the zirconium matrix. In the case of hydrides precipitating under stress, the strains in the hydrides are different in direction and trend. Analyses performed on the broadening of hydride diffraction peaks yielded information on the distribution of strains in hydride population during precipitation and cooldown. These results are discussed in light of existing models and experiments on hydride reorientation. C1 [Colas, Kimberly; Motta, Arthur] Penn State Univ, Dept Mech & Nucl Engn, University Pk, PA 16802 USA. [Daymond, Mark R.] Queens Univ, Dept Mech & Mat Engn, Kingston, ON K7L 3N6, Canada. [Almer, Jonathan] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. RP Colas, K (reprint author), CEA, French Atom Energy Commiss, DEN DANS DMN SEMI LM2E, F-91191 Gif Sur Yvette, France. EM kimberly.colas@cea.fr OI Daymond, Mark/0000-0001-6242-7489 NR 36 TC 1 Z9 1 U1 1 U2 2 PU ASTM INTERNATIONAL PI WEST CONSHOHOCKEN PA 100 BARR HARBOR DRIVE, PO BOX C700, WEST CONSHOHOCKEN, PA 19428-2959 USA SN 0066-0558 BN 978-0-8031-7529-7 J9 AM SOC TEST MATER PY 2015 VL 1543 BP 1107 EP 1137 DI 10.1520/STP154320120168 PG 31 WC Materials Science, Characterization & Testing; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA BE4GG UT WOS:000371681000039 ER PT S AU Appavoo, K Liu, XZ Menon, V Sfeir, MY AF Appavoo, Kannatassen Liu, Xiaoze Menon, Vinod Sfeir, Matthew Y. GP IEEE TI Room-Temperature Exciton Lasing In Ultrathin Film of Coupled Nanocrystals SO 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) SE Conference on Lasers and Electro-Optics LA English DT Proceedings Paper CT Conference on Lasers and Electro-Optics (CLEO) CY MAY 10-15, 2015 CL San Jose, CA AB We demonstrate exciton lasing in sub-wavelength coupled nanostructures at ultralow fluence threshold, as probed by femtosecond broadband emission and absorption spectroscopy. The complex spectrotemporal dynamics reveal for the first time an excitonic-to-electron-hole plasma lasing mechanism. C1 [Appavoo, Kannatassen; Sfeir, Matthew Y.] Brookhaven Natl Lab, Ctr Funct Nanomat, Upton, NY 11973 USA. [Liu, Xiaoze; Menon, Vinod] CUNY City Coll, New York, NY 10031 USA. RP Sfeir, MY (reprint author), Brookhaven Natl Lab, Ctr Funct Nanomat, Upton, NY 11973 USA. EM msfeir@bnl.gov NR 4 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2160-9020 BN 978-1-55752-968-8 J9 CONF LASER ELECTR PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BE3EW UT WOS:000370627103077 ER PT S AU Appavoo, K Wang, B Nag, J Sfeir, MY Pantelides, ST Haglund, RF AF Appavoo, Kannatassen Wang, Bin Nag, Joyeeta Sfeir, Matthew Y. Pantelides, Sokrates T. Haglund, Richard F. GP IEEE TI Doping-controlled Coherent Electron-Phonon Coupling in Vanadium Dioxide SO 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) SE Conference on Lasers and Electro-Optics LA English DT Proceedings Paper CT Conference on Lasers and Electro-Optics (CLEO) CY MAY 10-15, 2015 CL San Jose, CA AB Broadband femtosecond transient spectroscopy and density functional calculations reveal that substitutional tungsten doping of a VO2 film changes the coherent phonon response compared to the undoped film due to altered electronic and structural dynamics. C1 [Appavoo, Kannatassen; Haglund, Richard F.] Vanderbilt Univ, Interdisciplinary Mat Sci, Nashville, TN 37234 USA. [Appavoo, Kannatassen; Sfeir, Matthew Y.] Brookhaven Natl Lab, Ctr Funct Nanomat, Upton, NY 11973 USA. [Wang, Bin; Nag, Joyeeta; Pantelides, Sokrates T.; Haglund, Richard F.] Vanderbilt Univ, Dept Phys & Astron, Nashville, TN 37235 USA. [Pantelides, Sokrates T.] Oak Ridge Natl Lab, Div Mat Sci & Technol, Oak Ridge, TN 37831 USA. [Pantelides, Sokrates T.] Vanderbilt Univ, Dept Elect Engn & Comp Sci, Nashville, TN 37235 USA. RP Appavoo, K (reprint author), Vanderbilt Univ, Interdisciplinary Mat Sci, Nashville, TN 37234 USA. EM kappavoo@bnl.gov NR 5 TC 0 Z9 0 U1 2 U2 3 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2160-9020 BN 978-1-55752-968-8 J9 CONF LASER ELECTR PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BE3EW UT WOS:000370627102253 ER PT S AU Appavoo, K Liu, MZ Black, CT Sfeir, MY AF Appavoo, Kannatassen Liu, Mingzhao Black, Charles T. Sfeir, Matthew Y. GP IEEE TI Decoupling Bulk and Surface Contributions in Water-Splitting Photocatalysts by In Situ Ultrafast Spectroscopy SO 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) SE Conference on Lasers and Electro-Optics LA English DT Proceedings Paper CT Conference on Lasers and Electro-Optics (CLEO) CY MAY 10-15, 2015 CL San Jose, CA AB By performing ultrafast emission spectroscopy in an operating, bias-controlled photoelectrochemical cell, we distinguish between bulk (charge transport) and surface (chemical reaction) recombination processes in a nanostructured photocatalyst and correlate its electronic properties directly with its incident-photon-to-current efficiency. C1 [Appavoo, Kannatassen; Liu, Mingzhao; Black, Charles T.; Sfeir, Matthew Y.] Brookhaven Natl Lab, Ctr Funct Nanomat, Upton, NY 11973 USA. RP Appavoo, K (reprint author), Brookhaven Natl Lab, Ctr Funct Nanomat, Upton, NY 11973 USA. EM kappavoo@bnl.gov NR 4 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2160-9020 BN 978-1-55752-968-8 J9 CONF LASER ELECTR PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BE3EW UT WOS:000370627100217 ER PT S AU Bernhardt, B Li, X Beck, AR Warrick, ER Haxton, DJ McCurdy, CW Neumark, DM Leone, SR AF Bernhardt, Birgitta Li, Xuan Beck, Annelise R. Warrick, Erika R. Haxton, Daniel J. McCurdy, C. William Neumark, Daniel M. Leone, Stephen R. GP IEEE TI Attosecond Transient Absorption Explores Coupling Mechanisms of Autoionizing States SO 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) SE Conference on Lasers and Electro-Optics LA English DT Proceedings Paper CT Conference on Lasers and Electro-Optics (CLEO) CY MAY 10-15, 2015 CL San Jose, CA AB Attosecond transient absorption spectroscopy of highly excited states allows investigating the dynamics of both the decay and the light induced coupling between excited states. We present a rigorous quantum mechanical treatment that provides a generalized discussion of the on-and off-resonant decay dynamics, of resonant and non-resonant couplings to either discrete or continua states and the temporal evolution of the quantum beating of the excited wavepackets. The comparison of the model to experimental results obtained in xenon proves its general applicability. C1 [Bernhardt, Birgitta; Li, Xuan; Beck, Annelise R.; Warrick, Erika R.; Haxton, Daniel J.; McCurdy, C. William; Neumark, Daniel M.; Leone, Stephen R.] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Chem Sci, Ultrafast Xray Sci Lab, Berkeley, CA 94720 USA. [Bernhardt, Birgitta; Beck, Annelise R.; Warrick, Erika R.; Neumark, Daniel M.; Leone, Stephen R.] Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. [McCurdy, C. William] Univ Calif Davis, Dept Chem, Davis, CA 95616 USA. [Leone, Stephen R.] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. RP Bernhardt, B (reprint author), Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Chem Sci, Ultrafast Xray Sci Lab, Berkeley, CA 94720 USA. EM BCBernhardt@lbl.gov RI Neumark, Daniel/B-9551-2009 OI Neumark, Daniel/0000-0002-3762-9473 NR 4 TC 0 Z9 0 U1 0 U2 3 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2160-9020 BN 978-1-55752-968-8 J9 CONF LASER ELECTR PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BE3EW UT WOS:000370627100319 ER PT S AU Bowlan, J Xu, XS Sinha, K Trugman, SA Taylor, AJ Prasankumar, RP Yarotski, DA AF Bowlan, J. Xu, X. S. Sinha, K. Trugman, S. A. Taylor, A. J. Prasankumar, R. P. Yarotski, D. A. GP IEEE TI Ultrafast dynamics of multiferroic h-LuFeO3 SO 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) SE Conference on Lasers and Electro-Optics LA English DT Proceedings Paper CT Conference on Lasers and Electro-Optics (CLEO) CY MAY 10-15, 2015 CL San Jose, CA AB Hexagonal LuFeO3 is a multiferroic showing ferroelectricity and antiferromagnetism at room temperature. Below T-R=130 K, it becomes ferrimagnetic. Ultrafast optical pump-probe measurements reveal that the dynamics are correlated with the structural changes responsible for ferrimagnetism. C1 [Bowlan, J.; Trugman, S. A.; Taylor, A. J.; Prasankumar, R. P.; Yarotski, D. A.] Los Alamos Natl Lab, Ctr Integrated Nanotechnol, POB 1663, Los Alamos, NM 87544 USA. [Xu, X. S.; Sinha, K.] Univ Nebraska, Dept Phys & Astron, Lincoln, NE 68588 USA. RP Bowlan, J (reprint author), Los Alamos Natl Lab, Ctr Integrated Nanotechnol, POB 1663, Los Alamos, NM 87544 USA. EM jbowlan@lanl.gov; dzmitry@lanl.gov NR 4 TC 0 Z9 0 U1 1 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2160-9020 BN 978-1-55752-968-8 J9 CONF LASER ELECTR PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BE3EW UT WOS:000370627100374 ER PT S AU Bowlan, P Yarotski, DA Hur, NJ Taylor, AJ Prasankumar, RP AF Bowlan, P. Yarotski, D. A. Hur, N. J. Taylor, A. J. Prasankumar, R. P. GP IEEE TI Direct observation of magnon dynamics in multiferroic HoMnO3 SO 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) SE Conference on Lasers and Electro-Optics LA English DT Proceedings Paper CT Conference on Lasers and Electro-Optics (CLEO) CY MAY 10-15, 2015 CL San Jose, CA AB We directly resolve energy transfer pathways from electrons to magnons in multiferroic HoMnO3 using ultrafast optical/terahertz spectroscopy. This reveals that energy is initially transferred from electrons to phonons and subsequently to magnons through spin-lattice relaxation. (C) 2014 Optical Society of America C1 [Bowlan, P.; Yarotski, D. A.; Taylor, A. J.; Prasankumar, R. P.] Los Alamos Natl Lab, Ctr Integrated Nanotechnol, MS K771, Los Alamos, NM 87545 USA. [Hur, N. J.] Inha Univ, Dept Phys, Inchon 402751, South Korea. RP Bowlan, P (reprint author), Los Alamos Natl Lab, Ctr Integrated Nanotechnol, MS K771, Los Alamos, NM 87545 USA. EM pambowlan@lanl.gov NR 5 TC 0 Z9 0 U1 2 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2160-9020 BN 978-1-55752-968-8 J9 CONF LASER ELECTR PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BE3EW UT WOS:000370627100376 ER PT S AU Brumfield, BE Phillips, MC AF Brumfield, B. E. Phillips, M. C. GP IEEE TI Rapid Swept-Wavelength External Cavity Quantum Cascade Laser for Open Path Sensing SO 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) SE Conference on Lasers and Electro-Optics LA English DT Proceedings Paper CT Conference on Lasers and Electro-Optics (CLEO) CY MAY 10-15, 2015 CL San Jose, CA AB A rapidly tunable external cavity quantum cascade laser system is used for open path sensing. The system permits acquisition of transient absorption spectra over a 125 cm(-1) tuning range in less than 0.01 s. C1 [Brumfield, B. E.; Phillips, M. C.] Pacific NW Natl Lab, Richland, WA 99352 USA. RP Brumfield, BE (reprint author), Pacific NW Natl Lab, Richland, WA 99352 USA. EM brian.brumfield@pnnl.gov; mark.phillips@pnnl.gov NR 4 TC 0 Z9 0 U1 1 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2160-9020 BN 978-1-55752-968-8 J9 CONF LASER ELECTR PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BE3EW UT WOS:000370627102204 ER PT S AU Burghoff, D Yang, Y Hayton, DJ Gao, JR Reno, JL Hu, Q AF Burghoff, David Yang, Yang Hayton, Darren J. Gao, Jian-Rong Reno, John L. Hu, Qing GP IEEE TI Evaluating the temporal profile of quantum cascade laser frequency combs SO 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) SE Conference on Lasers and Electro-Optics LA English DT Proceedings Paper CT Conference on Lasers and Electro-Optics (CLEO) CY MAY 10-15, 2015 CL San Jose, CA AB The temporal profile of frequency combs based on quantum cascade lasers has been unclear for some time. We show how the SWIFTS technique directly measures such properties, obtaining combs' intensities and frequencies versus time. C1 [Burghoff, David; Yang, Yang; Hu, Qing] MIT, Dept Elect Engn & Comp Sci, Elect Res Lab, Cambridge, MA 02139 USA. [Hayton, Darren J.; Gao, Jian-Rong] SRON Netherlands Inst Space Res, NL-9747 AD Groningen, Netherlands. [Gao, Jian-Rong] Delft Univ Technol, Kavli Inst NanoSci, NL-2628 CJ Delft, Netherlands. [Reno, John L.] Sandia Natl Labs, Ctr Integrated Nanotechnol, Albuquerque, NM 87123 USA. RP Burghoff, D (reprint author), MIT, Dept Elect Engn & Comp Sci, Elect Res Lab, Cambridge, MA 02139 USA. EM burghoff@mit.edu NR 7 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2160-9020 BN 978-1-55752-968-8 J9 CONF LASER ELECTR PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BE3EW UT WOS:000370627102278 ER PT S AU Campione, S Liu, S Benz, A Klem, JF Sinclair, MB Brener, I AF Campione, Salvatore Liu, Sheng Benz, Alexander Klem, John F. Sinclair, Michael B. Brener, Igal GP IEEE TI Tailored Light-Matter Interaction through Epsilon-Near-Zero Modes SO 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) SE Conference on Lasers and Electro-Optics LA English DT Proceedings Paper CT Conference on Lasers and Electro-Optics (CLEO) CY MAY 10-15, 2015 CL San Jose, CA ID METAMATERIALS AB We use epsilon-near-zero modes in semiconductor nanolayers to design a system whose spectral properties are controlled by their interaction with multi-dipole resonances. This design flexibility renders our platform attractive for efficient nonlinear composite materials. C1 [Campione, Salvatore; Liu, Sheng; Benz, Alexander; Brener, Igal] Sandia Natl Labs, Ctr Integrated Nanotechnol, POB 5800, Albuquerque, NM 87185 USA. [Campione, Salvatore; Liu, Sheng; Benz, Alexander; Klem, John F.; Sinclair, Michael B.; Brener, Igal] Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Campione, S (reprint author), Sandia Natl Labs, Ctr Integrated Nanotechnol, POB 5800, Albuquerque, NM 87185 USA. EM sncampi@sandia.gov NR 15 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2160-9020 BN 978-1-55752-968-8 J9 CONF LASER ELECTR PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BE3EW UT WOS:000370627100490 ER PT S AU Chamanzar, M Garfield, DJ Iafrati, J Sohal, V Cohen, B Schuck, PJ Maharbiz, MM AF Chamanzar, Maysamreza Garfield, David J. Iafrati, Jillian Sohal, Vikaas Cohen, Bruce Schuck, P. James Maharbiz, Michel M. GP IEEE TI Tether-less Implantable Upconverting Microscale Light Bulbs for Deep Brain Neural Stimulation and Imaging SO 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) SE Conference on Lasers and Electro-Optics LA English DT Proceedings Paper CT Conference on Lasers and Electro-Optics (CLEO) CY MAY 10-15, 2015 CL San Jose, CA AB We demonstrate the design and fabrication of implantable micro-scale light "bulbs" comprising of parylene-encapsulated upconverting lanthanide-doped nanocrystals (absorbing near-infrared and emitting blue light) for non-invasive targeted optogenetic stimulation of local neuronal ensembles. C1 [Chamanzar, Maysamreza; Garfield, David J.; Maharbiz, Michel M.] Univ Calif Berkeley, Berkeley, CA 94720 USA. [Garfield, David J.; Cohen, Bruce; Schuck, P. James] Lawrence Berkeley Natl Lab, Mol Foundry, Berkeley, CA USA. [Iafrati, Jillian; Sohal, Vikaas] Univ Calif San Francisco, San Francisco, CA 94143 USA. RP Chamanzar, M (reprint author), Univ Calif Berkeley, Berkeley, CA 94720 USA. EM Chamanzar@berkeley.edu NR 4 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2160-9020 BN 978-1-55752-968-8 J9 CONF LASER ELECTR PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BE3EW UT WOS:000370627100040 ER PT S AU Chen, HT Zhang, BY Guo, JP Hendrickson, J Nader, N AF Chen, Hou-Tong Zhang, Boyang Guo, Junpeng Hendrickson, Joshua Nader, Nima GP IEEE TI Metasurface Optical Antireflection Coatings SO 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) SE Conference on Lasers and Electro-Optics LA English DT Proceedings Paper CT Conference on Lasers and Electro-Optics (CLEO) CY MAY 10-15, 2015 CL San Jose, CA AB We demonstrate a new strategy of optical antireflection coatings employing metasurfaces with designer surface properties in the mid-wave infrared. It has very little requirement on the choice of materials and is scalable to other wavelengths. C1 [Chen, Hou-Tong] Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. [Zhang, Boyang; Guo, Junpeng] Univ Alabama, Huntsville, AL 35899 USA. [Hendrickson, Joshua; Nader, Nima] Air Force Res Lab, Wright Patterson AFB, OH 45433 USA. RP Chen, HT (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. EM chenht@lanl.gov NR 4 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2160-9020 BN 978-1-55752-968-8 J9 CONF LASER ELECTR PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BE3EW UT WOS:000370627101021 ER PT S AU Chong, XY Kim, KJ Ohodnicki, PR Li, E Chang, CH Wang, AX AF Chong, Xinyuan Kim, Ki-Joong Ohodnicki, Paul R. Li, Erwen Chang, Chih-Hung Wang, Alan X. GP IEEE TI Near-Infrared Absorption Gas Sensors using Metal-Organic Framework-Coated Optical Fibers SO 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) SE Conference on Lasers and Electro-Optics LA English DT Proceedings Paper CT Conference on Lasers and Electro-Optics (CLEO) CY MAY 10-15, 2015 CL San Jose, CA AB We report a near-infrared fiber-optic CO2 sensor with only 8-centimeter sensing length coated with nanoporous metal-organic framework materials. We achieved 500ppm detection limit with an overall response time of 40 seconds in a gas cell. C1 [Chong, Xinyuan; Li, Erwen; Wang, Alan X.] Oregon State Univ, Sch Elect Engn & Comp Sci, Corvallis, OR 97331 USA. [Kim, Ki-Joong; Chang, Chih-Hung] Oregon State Univ, Sch Chem Biol & Environm Engn, Corvallis, OR 97331 USA. [Ohodnicki, Paul R.] US DOE, Natl Energy Technol Lab, Pittsburgh, PA 15236 USA. RP Wang, AX (reprint author), Oregon State Univ, Sch Elect Engn & Comp Sci, Corvallis, OR 97331 USA. EM wang@eecs.oregonstate.edu NR 7 TC 0 Z9 0 U1 1 U2 5 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2160-9020 BN 978-1-55752-968-8 J9 CONF LASER ELECTR PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BE3EW UT WOS:000370627102015 ER PT S AU Coslovich, G Smith, RP Shi, SF Buss, JH Robinson, JT Wang, F Kaindl, RA AF Coslovich, G. Smith, R. P. Shi, S. -F. Buss, J. H. Robinson, J. T. Wang, F. Kaindl, R. A. GP IEEE TI Ultrabroadband THz Conductivity of Non-equilibrium Dirac Fermions in Graphene SO 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) SE Conference on Lasers and Electro-Optics LA English DT Proceedings Paper CT Conference on Lasers and Electro-Optics (CLEO) CY MAY 10-15, 2015 CL San Jose, CA AB We employ ultrabroadband THz pulses to expose the high-frequency transport of non-equilibrium Dirac fermions in graphene. Tuning the Fermi level reveals a transient response characteristic of high-energy photo-excited carriers with strongly enhanced interactions. C1 [Coslovich, G.; Smith, R. P.; Shi, S. -F.; Buss, J. H.; Wang, F.; Kaindl, R. A.] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA. [Shi, S. -F.; Wang, F.] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. [Robinson, J. T.] Naval Res Lab, Washington, DC 20375 USA. RP Coslovich, G (reprint author), Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA. NR 6 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2160-9020 BN 978-1-55752-968-8 J9 CONF LASER ELECTR PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BE3EW UT WOS:000370627100430 ER PT S AU Coslovich, G Lee, WS Bechtel, HA Martin, MC Sasagawa, T Shen, ZX Kaindl, RA AF Coslovich, G. Lee, W. -S. Bechtel, H. A. Martin, M. C. Sasagawa, T. Shen, Z. -X. Kaindl, R. A. GP IEEE TI Probing Short- and Long-range Stripe Correlations in a Nickelate via Multi-THz Spectroscopy SO 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) SE Conference on Lasers and Electro-Optics LA English DT Proceedings Paper CT Conference on Lasers and Electro-Optics (CLEO) CY MAY 10-15, 2015 CL San Jose, CA AB We report optical-pump THz-probe reflectivity studies around the resonance frequency (approximate to 11 THz) of the in-plane bending mode of a stripe-ordered nickelate. The experiments reveal signatures of both short and long-range nanoscale charge order dynamics. C1 [Coslovich, G.; Kaindl, R. A.] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA. [Lee, W. -S.; Shen, Z. -X.] SLAC Natl Accelerator Lab, SIMES, Menlo Pk, CA 94025 USA. [Lee, W. -S.; Shen, Z. -X.] Stanford Univ, Menlo Pk, CA 94025 USA. [Bechtel, H. A.; Martin, M. C.] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Adv Light Source, Berkeley, CA 94720 USA. [Sasagawa, T.] Tokyo Inst Technol, Mat & Struct Lab, Yokosuka, Kanagawa 2268503, Japan. RP Coslovich, G (reprint author), Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA. NR 4 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2160-9020 BN 978-1-55752-968-8 J9 CONF LASER ELECTR PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BE3EW UT WOS:000370627100373 ER PT S AU Davidson, RB Lougovski, P Lawrie, B AF Davidson, Roderick B., II Lougovski, Pavel Lawrie, Ben J. GP IEEE TI Quantum Model of Plasmon-Quantum Emitter Interaction in the Strong-Coupling Regime SO 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) SE Conference on Lasers and Electro-Optics LA English DT Proceedings Paper CT Conference on Lasers and Electro-Optics (CLEO) CY MAY 10-15, 2015 CL San Jose, CA AB A full quantum model incorporating realizable materials properties is developed for interactions between a plasmonic resonator and a single two-level quantum emitter, enabling fabrication of plasmonic nanostructures for the strong coupling regime of cavity-quantum-electrodynamics. C1 [Davidson, Roderick B., II; Lougovski, Pavel; Lawrie, Ben J.] Oak Ridge Natl Lab, Quantum Informat Sci Grp, Oak Ridge, TN 37830 USA. [Davidson, Roderick B., II] Vanderbilt Univ, Dept Phys & Astron, Nashville, TN 37235 USA. RP Davidson, RB (reprint author), Oak Ridge Natl Lab, Quantum Informat Sci Grp, Oak Ridge, TN 37830 USA. EM roderick.b.davidson@vanderbilt.edu NR 4 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2160-9020 BN 978-1-55752-968-8 J9 CONF LASER ELECTR PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BE3EW UT WOS:000370627100480 ER PT S AU Davidson, RB Yanchenko, A Ziegler, J Avanesyan, SM Haglund, RF AF Davidson, Roderick B., II Yanchenko, Anna Ziegler, Jed Avanesyan, Sergey M. Haglund, Richard F., Jr. GP IEEE TI All-Optical-Field-Induced Second-Harmonic Generation SO 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) SE Conference on Lasers and Electro-Optics LA English DT Proceedings Paper CT Conference on Lasers and Electro-Optics (CLEO) CY MAY 10-15, 2015 CL San Jose, CA AB Interferometric pump-probe spectroscopy is used to demonstrate all-optical second-harmonic generation from a polymer dielectric in a serrated nanogap structure. Strong optical frequency electric-fields from surface plasmons create ultrafast controllable nonlinear light pulses. C1 [Davidson, Roderick B., II; Ziegler, Jed; Avanesyan, Sergey M.; Haglund, Richard F., Jr.] Vanderbilt Univ, Dept Phys & Astron, Nashville, TN 37235 USA. [Davidson, Roderick B., II] Oak Ridge Natl Lab, Oak Ridge, TN 37830 USA. [Yanchenko, Anna] Univ Virginia, Dept Phys, Charlottesville, VA 22904 USA. RP Davidson, RB (reprint author), Vanderbilt Univ, Dept Phys & Astron, Nashville, TN 37235 USA. EM roderick.b.davidson@vanderbilt.edu NR 5 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2160-9020 BN 978-1-55752-968-8 J9 CONF LASER ELECTR PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BE3EW UT WOS:000370627100272 ER PT S AU Eggleston, MS Desai, S Messer, K Madhvapathy, S Xiao, J Zhang, X Yablonovitch, E Javey, A Wu, MC AF Eggleston, Michael S. Desai, Sujay Messer, Kevin Madhvapathy, Surabhi Xiao, Jun Zhang, Xiang Yablonovitch, Eli Javey, Ali Wu, Ming C. GP IEEE TI Enhanced Spontaneous Emission from an Optical Antenna Coupled WSe2 Monolayer SO 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) SE Conference on Lasers and Electro-Optics LA English DT Proceedings Paper CT Conference on Lasers and Electro-Optics (CLEO) CY MAY 10-15, 2015 CL San Jose, CA AB A self-aligned process is developed to couple monolayer WSe2 (30nm x 300nm) to a silver cavity-backed slot-antenna. Optical emission measurements show 340x enhancement in spontaneous emission. Carrier lifetimes of <1ps are measured by streak camera. C1 [Eggleston, Michael S.; Desai, Sujay; Messer, Kevin; Madhvapathy, Surabhi; Yablonovitch, Eli; Javey, Ali; Wu, Ming C.] Univ Calif Berkeley, Dept Elect Engn & Comp Sci, Berkeley, CA 94720 USA. [Desai, Sujay; Zhang, Xiang; Javey, Ali] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA. [Xiao, Jun; Zhang, Xiang] Univ Calif Berkeley, Nanoscale Sci & Engn Ctr, Berkeley, CA 94720 USA. RP Eggleston, MS (reprint author), Univ Calif Berkeley, Dept Elect Engn & Comp Sci, Berkeley, CA 94720 USA. EM eggles@berkeley.edu NR 6 TC 0 Z9 0 U1 2 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2160-9020 BN 978-1-55752-968-8 J9 CONF LASER ELECTR PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BE3EW UT WOS:000370627100389 ER PT S AU Hachtel, J Mayo, D Mouti, A Marvinney, C Mu, R Haglund, RF Lupini, AR Chisholm, M Pantelides, ST AF Hachtel, Jordan Mayo, Daniel Mouti, Anas Marvinney, Claire Mu, Richard Haglund, Richard F. Lupini, Andrew R. Chisholm, Matthew Pantelides, Sokrates T. GP IEEE TI Spatially-resolved, Three-dimensional Investigation of Surface Plasmon Resonances in Complex Nanostructures SO 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) SE Conference on Lasers and Electro-Optics LA English DT Proceedings Paper CT Conference on Lasers and Electro-Optics (CLEO) CY MAY 10-15, 2015 CL San Jose, CA AB We report a three-dimensional study of surface plasmons in random-morphology nanoparticles by combining spatially resolved electron energy loss spectroscopy, which probes optical excitations, and cathodoluminescence, which probes radiative decay, in a scanning transmission electron microscope. C1 [Hachtel, Jordan; Haglund, Richard F.; Pantelides, Sokrates T.] Vanderbilt Univ, Dept Phys & Astron, Nashville, TN 37235 USA. [Hachtel, Jordan; Mouti, Anas; Lupini, Andrew R.; Chisholm, Matthew; Pantelides, Sokrates T.] Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN USA. [Mayo, Daniel; Marvinney, Claire; Haglund, Richard F.] Vanderbilt Univ, Interdisciplinary Mat Sci Program, 221 Kirkland Hall, Nashville, TN 37235 USA. [Mayo, Daniel; Mu, Richard] Fisk Univ, Dept Phys, Nashville, TN USA. RP Hachtel, J (reprint author), Vanderbilt Univ, Dept Phys & Astron, Nashville, TN 37235 USA. EM jordan.a.hachtel@vanderbilt.edu RI Hachtel, Jordan/R-1263-2016 OI Hachtel, Jordan/0000-0002-9728-0920 NR 5 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2160-9020 BN 978-1-55752-968-8 J9 CONF LASER ELECTR PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BE3EW UT WOS:000370627100306 ER PT S AU Helml, W Maier, AR Schweinberger, W Grguras, I Radcliffe, P Doumy, G Roedig, C Gagnon, J Messerschmidt, M Schorb, S Bostedt, C Gruner, F DiMauro, LF Cubaynes, D Bozek, JD Tschentseher, T Costello, JT Meyer, M Coffee, R Dusterer, S Cavalieri, AL Kienberger, R AF Helml, W. Maier, A. R. Schweinberger, W. Grguras, I. Radcliffe, P. Doumy, G. Roedig, C. Gagnon, J. Messerschmidt, M. Schorb, S. Bostedt, C. Gruener, F. DiMauro, L. F. Cubaynes, D. Bozek, J. D. Tschentseher, Th. Costello, J. T. Meyer, M. Coffee, R. Duesterer, S. Cavalieri, A. L. Kienberger, R. GP IEEE TI Sub-Femtosecond Free-Electron Laser Pulses SO 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) SE Conference on Lasers and Electro-Optics LA English DT Proceedings Paper CT Conference on Lasers and Electro-Optics (CLEO) CY MAY 10-15, 2015 CL San Jose, CA AB Deploying the so-called 'Streaking Spectroscopy' technique at LCLS, we demonstrate a non-invasive scheme for temporal characterization of X-ray pulses with sub-femtosecond resolution. Analyzing the substructure indicates pulse durations on the order of hundreds of attoseconds. C1 [Helml, W.; Kienberger, R.] Tech Univ Munich, Phys Dept E11, James Franck Str, D-85748 Garching, Germany. [Helml, W.; Schweinberger, W.; Gagnon, J.; Kienberger, R.] Max Planck Inst Quantum Opt, D-85748 Garching, Germany. [Maier, A. R.; Grguras, I.; Gruener, F.; Cavalieri, A. L.] Ctr Free Electron Laser Sci CFEL, D-22607 Hamburg, Germany. [Maier, A. R.; Gruener, F.] Univ Hamburg, Inst Expt Phys, Grp Beschleunigerphys, D-22761 Hamburg, Germany. [Maier, A. R.; Gruener, F.] Ctr Xray Free Electron Laser Sci, D-22761 Hamburg, Germany. [Grguras, I.; Cavalieri, A. L.] Max Planck Inst Struct & Dynam Matter, D-22761 Hamburg, Germany. [Radcliffe, P.; Tschentseher, Th.; Meyer, M.] European XFEL, D-22761 Hamburg, Germany. [Doumy, G.] Argonne Natl Lab, Argonne, IL 60439 USA. [Doumy, G.; Roedig, C.; DiMauro, L. F.] Ohio State Univ, Dept Phys, Columbus, OH 43210 USA. [Messerschmidt, M.; Schorb, S.; Bostedt, C.; Bozek, J. D.; Coffee, R.] Linac Coherent Light Source, Menlo Pk, CA 94025 USA. [Cubaynes, D.; Meyer, M.] Univ Paris 11, CNRS, UMR 8214, Inst Sci Mol Orsay, F-91405 Orsay, France. [Costello, J. T.] Dublin City Univ, Sch Phys Sci, Dublin 9, Ireland. [Costello, J. T.] Dublin City Univ, NCPST, Dublin 9, Ireland. [Duesterer, S.] DESY, D-22607 Hamburg, Germany. RP Helml, W (reprint author), Tech Univ Munich, Phys Dept E11, James Franck Str, D-85748 Garching, Germany. EM Wolfram.Helm@tum.de RI Bozek, John/E-9260-2010; Helml, Wolfram/D-1005-2017 OI Bozek, John/0000-0001-7486-7238; NR 5 TC 0 Z9 0 U1 2 U2 5 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2160-9020 BN 978-1-55752-968-8 J9 CONF LASER ELECTR PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BE3EW UT WOS:000370627102361 ER PT S AU Hess, W Gong, Y Joly, A El-Khoury, P AF Hess, Wayne Gong, Yu Joly, Alan El-Khoury, Patrick GP IEEE TI Interferometric Plasmon Propagation and Lensing with Nanohole Arrays in Gold Films: Visualization by Nonlinear Photoemission Electron Microscopy SO 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) SE Conference on Lasers and Electro-Optics LA English DT Proceedings Paper CT Conference on Lasers and Electro-Optics (CLEO) CY MAY 10-15, 2015 CL San Jose, CA AB Nonlinear photoemission electron microscopy, of nanohole arrays litho-graphically etched in gold films, is used to map propagating surface plasmon polaritons (SPPs). The recorded photoemission patterns are attributed to interferences between SPPs launched from the individual nanoholes. C1 [Hess, Wayne; Gong, Yu; Joly, Alan; El-Khoury, Patrick] Pacific NW Natl Lab, Div Phys Sci, Richland, WA 99352 USA. RP Hess, W (reprint author), Pacific NW Natl Lab, Div Phys Sci, Richland, WA 99352 USA. EM wayne.hess@pnnl.gov NR 2 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2160-9020 BN 978-1-55752-968-8 J9 CONF LASER ELECTR PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BE3EW UT WOS:000370627100302 ER PT S AU Hurricane, OA Amendt, P Benedetti, LR Bond, E Bradley, D Caggiano, J Callahan, DA Casey, DT Clark, D Dewald, EL Dittrich, TR Doeppner, T Divol, L Dixit, S Edgell, D Edwards, MJ Fittinghoff, D Frenje, J Garcia, MAB Gatu-Johnson, M Grim, G Haan, S Hamza, A Haterik, R Hinkel, DE Ho, D Hohenberger, M Hoover, D Hopkins, LFB Hsing, W Izumi, N Jones, O Khan, S Kline, JL Knauer, J Kritcher, AL Kyrala, G Landen, O Le Pape, S Leidinger, JP Ma, T Mackinnon, AJ MacPhee, AG Meezan, N Merrill, F Michel, P Milovich, J Moody, J Moore, AS Nagel, S Nikroo, A Pak, AE Park, HS Patel, PK Peterson, L Ralph, J Remington, BA Robey, HF Ross, S Rygg, R Salmonson, JD Spears, B Springer, PT Schneider, M Smalyuk, V Thomas, C Tommasini, R Town, RPJ Wilde, C Widmann, K Volegov, P AF Hurricane, O. A. Amendt, P. Benedetti, L. R. Bond, E. Bradley, D. Caggiano, J. Callahan, D. A. Casey, D. T. Clark, D. Dewald, E. L. Dittrich, T. R. Doeppner, T. Divol, L. Dixit, S. Edgell, D. Edwards, M. J. Fittinghoff, D. Frenje, J. Garcia, M. A. Barrios Gatu-Johnson, M. Grim, G. Haan, S. Hamza, A. Haterik, R. Hinkel, D. E. Ho, D. Hohenberger, M. Hoover, D. Hopkins, L. F. Berzak Hsing, W. Izumi, N. Jones, O. Khan, S. Kline, J. L. Knauer, J. Kritcher, A. L. Kyrala, G. Landen, O. Le Pape, S. Leidinger, J. -P. Ma, T. Mackinnon, A. J. MacPhee, A. G. Meezan, N. Merrill, F. Michel, P. Milovich, J. Moody, J. Moore, A. S. Nagel, S. Nikroo, A. Pak, A. E. Park, H-S. Patel, P. K. Peterson, L. Ralph, J. Remington, B. A. Robey, H. F. Ross, S. Rygg, R. Salmonson, J. D. Spears, B. Springer, P. T. Schneider, M. Smalyuk, V. Thomas, C. Tommasini, R. Town, R. P. J. Wilde, C. Widmann, K. Volegov, P. GP IEEE TI Getting beyond unity fusion 'fuel-gain' in an inertially confined fusion implosion SO 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) SE Conference on Lasers and Electro-Optics LA English DT Proceedings Paper CT Conference on Lasers and Electro-Optics (CLEO) CY MAY 10-15, 2015 CL San Jose, CA AB In this talk, we will discuss the progress towards ignition on the National Ignition Facility (NIF) at Lawrence Livermore National Laboratory (LLNL) in Northern California. We will cover the some of the setbacks encountered during the progress of the research at NIF, but also cover the great advances that have been made including the achievements of greater than unity fusion 'fuel gain' and alpha-heating dominated fusion plasmas. The research strategy for the future will also be discussed. C1 [Hurricane, O. A.; Amendt, P.; Benedetti, L. R.; Bond, E.; Bradley, D.; Caggiano, J.; Callahan, D. A.; Casey, D. T.; Clark, D.; Dewald, E. L.; Dittrich, T. R.; Doeppner, T.; Divol, L.; Dixit, S.; Edgell, D.; Edwards, M. J.; Fittinghoff, D.; Garcia, M. A. Barrios; Haan, S.; Hamza, A.; Haterik, R.; Hinkel, D. E.; Ho, D.; Hopkins, L. F. Berzak; Hsing, W.; Izumi, N.; Jones, O.; Khan, S.; Kritcher, A. L.; Landen, O.; Le Pape, S.; Ma, T.; Mackinnon, A. J.; MacPhee, A. G.; Meezan, N.; Michel, P.; Moody, J.; Nagel, S.; Pak, A. E.; Park, H-S.; Patel, P. K.; Peterson, L.; Ralph, J.; Remington, B. A.; Robey, H. F.; Ross, S.; Salmonson, J. D.; Spears, B.; Springer, P. T.; Schneider, M.; Smalyuk, V.; Thomas, C.; Tommasini, R.; Town, R. P. J.; Widmann, K.] Lawrence Livermore Natl Lab, POB 808, Livermore, CA 94551 USA. [Grim, G.; Kline, J. L.; Kyrala, G.; Merrill, F.; Wilde, C.; Volegov, P.] Los Alamos Natl Lab, Los Alamos, NM 87545 USA. [Frenje, J.; Gatu-Johnson, M.] MIT, Cambridge, MA 02139 USA. [Hohenberger, M.; Knauer, J.] Univ Rochester, Laser Energet Lab, Rochester, NY 14623 USA. [Moore, A. S.] AWE, Reading RG7 4PR, Berks, England. [Leidinger, J. -P.] CEA, F-75015 Paris, France. [Hoover, D.; Nikroo, A.] Gen Atom Co, San Diego, CA 92186 USA. RP Hurricane, OA (reprint author), Lawrence Livermore Natl Lab, POB 808, Livermore, CA 94551 USA. RI IZUMI, Nobuhiko/J-8487-2016 OI IZUMI, Nobuhiko/0000-0003-1114-597X NR 11 TC 0 Z9 0 U1 2 U2 9 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2160-9020 BN 978-1-55752-968-8 J9 CONF LASER ELECTR PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BE3EW UT WOS:000370627100288 ER PT S AU Jobst, M Neppl, S Riemensberger, J Ossiander, M Schaffer, M Bothschafter, E Gerl, M Kim, A Barth, J Krausz, F Feulner, P Kienberger, R AF Jobst, M. Neppl, S. Riemensberger, J. Ossiander, M. Schaeffer, M. Bothschafter, E. Gerl, M. Kim, A. Barth, J. Krausz, F. Feulner, P. Kienberger, R. GP IEEE TI Excitation Energy Dependent Attosecond Photoemission Timing in Tungsten SO 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) SE Conference on Lasers and Electro-Optics LA English DT Proceedings Paper CT Conference on Lasers and Electro-Optics (CLEO) CY MAY 10-15, 2015 CL San Jose, CA AB A multitude of physical effects have been proposed to determine the photoemission delay between core and valence electrons in tungsten. We present selected streaking experiments that clarify its origins. C1 [Jobst, M.; Riemensberger, J.; Ossiander, M.; Schaeffer, M.; Gerl, M.; Kim, A.; Krausz, F.; Kienberger, R.] Max Planck Inst Quantum Opt, Hans Kopfermann Str 1, D-85748 Garching, Germany. [Jobst, M.; Riemensberger, J.; Ossiander, M.; Schaeffer, M.; Gerl, M.; Kim, A.; Barth, J.; Feulner, P.; Kienberger, R.] Tech Univ Munich, D-85748 Garching, Germany. [Krausz, F.] Univ Munich, D-80799 Munich, Germany. [Bothschafter, E.] Paul Scherrer Inst, CH-5232 Villigen, Switzerland. [Neppl, S.] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Ultrafast Xray Sci Lab, Berkeley, CA 94720 USA. RP Jobst, M (reprint author), Max Planck Inst Quantum Opt, Hans Kopfermann Str 1, D-85748 Garching, Germany. EM michael.jobst@mpq.mpg.de NR 7 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2160-9020 BN 978-1-55752-968-8 J9 CONF LASER ELECTR PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BE3EW UT WOS:000370627100318 ER PT S AU Jones, AM Lentine, AL DeRose, CT Starbuck, AL Pomerene, A Norwood, RA AF Jones, Adam M. Lentine, Anthony L. DeRose, Christopher T. Starbuck, Andrew L. Pomerene, Andrew Norwood, Robert A. GP IEEE TI Efficient Coefficient Extraction from Doublet Resonances in Microphotonic Resonator Transmission Functions SO 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) SE Conference on Lasers and Electro-Optics LA English DT Proceedings Paper CT Conference on Lasers and Electro-Optics (CLEO) CY MAY 10-15, 2015 CL San Jose, CA AB We develop a computationally efficient and robust algorithm to automatically extract the coefficients of doublet resonances and apply this technique to 418 resonances in ring resonator transmission data with a mean RMS deviation of 7.28 x 10(-4). C1 [Jones, Adam M.; Lentine, Anthony L.; DeRose, Christopher T.; Starbuck, Andrew L.; Pomerene, Andrew] Sandia Natl Labs, Appl Photon Microsyst, Albuquerque, NM 87123 USA. [Jones, Adam M.; Norwood, Robert A.] Univ Arizona, Ctr Opt Sci, Tucson, AZ 85721 USA. RP Jones, AM (reprint author), Sandia Natl Labs, Appl Photon Microsyst, Albuquerque, NM 87123 USA. EM adajone@sandia.gov NR 6 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2160-9020 BN 978-1-55752-968-8 J9 CONF LASER ELECTR PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BE3EW UT WOS:000370627101483 ER PT S AU Kalita, MR Bishof, M Bailey, K Dietrich, MR Greene, JP Holt, RJ Korsch, W Lu, ZT Lemke, ND Mueller, P O'Connor, TP Parker, RH Singh, JT AF Kalita, M. R. Bishof, M. Bailey, K. Dietrich, M. R. Greene, J. P. Holt, R. J. Korsch, W. Lu, Z. -T. Lemke, N. D. Mueller, P. O'Connor, T. P. Parker, R. H. Singh, J. T. GP IEEE TI Search For a Permanent Electric Dipole Moment (EDM) of Ra-225 Atom SO 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) SE Conference on Lasers and Electro-Optics LA English DT Proceedings Paper CT Conference on Lasers and Electro-Optics (CLEO) CY MAY 10-15, 2015 CL San Jose, CA AB We are searching for a permanent EDM of the Ra-225 atom. Recently we have observed spin precession of Ra-225 atoms in parallel electric and magnetic fields. (C) 2015 Optical Society of America C1 [Kalita, M. R.; Bishof, M.; Bailey, K.; Greene, J. P.; Holt, R. J.; Lu, Z. -T.; Lemke, N. D.; Mueller, P.; O'Connor, T. P.; Parker, R. H.] Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. [Lu, Z. -T.; Parker, R. H.] Univ Chicago, Chicago, IL 60637 USA. [Kalita, M. R.; Korsch, W.] Univ Kentucky, Lexington, KY 40506 USA. [Singh, J. T.] Michigan State Univ, E Lansing, MI 48824 USA. [Dietrich, M. R.] Northwestern Univ, Evanston, IL 60208 USA. RP Kalita, MR (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. EM mkalita@anl.gov RI Lemke, Nathan/L-9059-2013 OI Lemke, Nathan/0000-0003-4165-0715 NR 13 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2160-9020 BN 978-1-55752-968-8 J9 CONF LASER ELECTR PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BE3EW UT WOS:000370627100285 ER PT S AU Kamaraju, N Pan, W Ekenberg, U Gvozdic, DM Boubanga-Tombet, S Upadhya, PC Reno, J Taylor, AJ Prasankumar, RP AF Kamaraju, N. Pan, W. Ekenberg, U. Gvozdic, D. M. Boubanga-Tombet, S. Upadhya, P. C. Reno, J. Taylor, A. J. Prasankumar, R. P. GP IEEE TI Terahertz magneto-optical spectroscopy of two-dimensional hole and electron systems SO 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) SE Conference on Lasers and Electro-Optics LA English DT Proceedings Paper CT Conference on Lasers and Electro-Optics (CLEO) CY MAY 10-15, 2015 CL San Jose, CA AB Terahertz magneto-optical spectroscopy on a two-dimensional hole gas reveal a nonlinear dependence on the applied magnetic field. This is due to its complex non-parabolic valence band structure, as verified by multiband Landau level theoretical calculations. C1 [Kamaraju, N.; Boubanga-Tombet, S.; Upadhya, P. C.; Taylor, A. J.; Prasankumar, R. P.] Los Alamos Natl Lab, Ctr Integrated Nanotechnol, POB 1663, Los Alamos, NM 87545 USA. [Pan, W.; Reno, J.] Sandia Natl Labs, Albuquerque, NM 87123 USA. [Ekenberg, U.] Semiconsultants, SE-18773 Taby, Sweden. [Gvozdic, D. M.] Univ Belgrade, Sch Elect Engn, Belgrade 11120, Serbia. [Boubanga-Tombet, S.] Tohoku Univ, Elect Commun Res Inst, Aoba Ku, Sendai, Miyagi 980, Japan. [Upadhya, P. C.] Indian Space Res Org, Lab Electroopt Syst, Bangalore 560058, Karnataka, India. RP Kamaraju, N (reprint author), Los Alamos Natl Lab, Ctr Integrated Nanotechnol, POB 1663, Los Alamos, NM 87545 USA. EM nkamaraju@gmail.com NR 9 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2160-9020 BN 978-1-55752-968-8 J9 CONF LASER ELECTR PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BE3EW UT WOS:000370627100191 ER PT S AU Karl, N Chen, HT Taylor, AJ Brener, I Benz, A Reno, J Mendis, R Mittleman, DM AF Karl, N. Chen, H-T Taylor, A. J. Brener, I. Benz, A. Reno, J. Mendis, R. Mittleman, D. M. GP IEEE TI Terahertz Surface Wave Modulation in a Dielectric Slab Metasurface SO 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) SE Conference on Lasers and Electro-Optics LA English DT Proceedings Paper CT Conference on Lasers and Electro-Optics (CLEO) CY MAY 10-15, 2015 CL San Jose, CA AB We experimentally and numerically investigate a switchable dielectric-slab-waveguide metasurface device. We use an active metasurface to manipulate the interaction with a propagating THz surface wave, giving us dynamic control of the wave at 0.3 THz. C1 [Karl, N.; Mendis, R.; Mittleman, D. M.] Rice Univ, Dept Elect & Comp Engn, MS 378, Houston, TX 77251 USA. [Chen, H-T; Taylor, A. J.] Los Alamos Natl Lab, Ctr Integrated Nanotechnol, Los Alamos, NM 87545 USA. [Brener, I.; Benz, A.; Reno, J.] Sandia Natl Labs, Ctr Integrated Nanotechnol, Albuquerque, NM 87185 USA. RP Karl, N (reprint author), Rice Univ, Dept Elect & Comp Engn, MS 378, Houston, TX 77251 USA. EM daniel@rice.edu NR 6 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2160-9020 BN 978-1-55752-968-8 J9 CONF LASER ELECTR PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BE3EW UT WOS:000370627102289 ER PT S AU Kuznetsov, I Filevich, J Dong, F Woolston, M Chao, WL Anderson, EH Bernstein, ER Crick, DC Rocca, JJ Menoni, CS AF Kuznetsov, Ilya Filevich, Jorge Dong, Feng Woolston, Mark Chao, Weilun Anderson, Erik H. Bernstein, Elliot R. Crick, Dean C. Rocca, Jorge J. Menoni, Carmen S. GP IEEE TI Nanoscale Composition Imaging by Extreme Ultraviolet Laser Ablation Mass Spectrometry SO 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) SE Conference on Lasers and Electro-Optics LA English DT Proceedings Paper CT Conference on Lasers and Electro-Optics (CLEO) CY MAY 10-15, 2015 CL San Jose, CA ID X-RAY LASER AB The first nano-scale 3-dimensional composition imaging is demonstrated. EUV laser ablation enables composition maps with 75 nm lateral, 20 nm depth resolution, and 0.01 amol sensitivity. 3D composition images of a single micro-organism were obtained. C1 [Kuznetsov, Ilya; Filevich, Jorge; Dong, Feng; Woolston, Mark; Chao, Weilun; Anderson, Erik H.; Bernstein, Elliot R.; Rocca, Jorge J.; Menoni, Carmen S.] Colorado State Univ, Ctr Extreme Ultraviolet Sci & Technol, Ft Collins, CO 80523 USA. [Kuznetsov, Ilya; Filevich, Jorge; Woolston, Mark; Rocca, Jorge J.; Menoni, Carmen S.] Colorado State Univ, Dept Elect & Comp Engn, Ft Collins, CO 80523 USA. [Dong, Feng; Bernstein, Elliot R.; Menoni, Carmen S.] Colorado State Univ, Dept Chem, Ft Collins, CO 80523 USA. [Chao, Weilun; Anderson, Erik H.] Lawrence Berkeley Lab, Ctr Xray Opt, Berkeley, CA USA. [Crick, Dean C.] Colorado State Univ, Dept Microbiol Immunol & Pathol, Ft Collins, CO 80523 USA. [Rocca, Jorge J.] Colorado State Univ, Dept Phys, Ft Collins, CO 80523 USA. RP Menoni, CS (reprint author), Colorado State Univ, Ctr Extreme Ultraviolet Sci & Technol, Ft Collins, CO 80523 USA. EM Carmen.Menoni@colostate.edu NR 3 TC 0 Z9 0 U1 2 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2160-9020 BN 978-1-55752-968-8 J9 CONF LASER ELECTR PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BE3EW UT WOS:000370627103070 ER PT S AU Langner, MC Roy, S Mishra, SK Lee, JCT Shi, XW Hossain, MA Chuang, YD Seki, S Tokura, Y Kevan, SD Schoenlein, RW AF Langner, M. C. Roy, S. Mishra, S. K. Lee, J. C. T. Shi, X. W. Hossain, M. A. Chuang, Y. -D. Seki, S. Tokura, Y. Kevan, S. D. Schoenlein, R. W. GP IEEE TI Ultrafast Dynamics of the Skyrmion and Conical Phases in Cu2OSeO3 SO 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) SE Conference on Lasers and Electro-Optics LA English DT Proceedings Paper CT Conference on Lasers and Electro-Optics (CLEO) CY MAY 10-15, 2015 CL San Jose, CA AB We study the skyrmion structure in Cu2OSeO3 using resonant x-ray spectroscopy. The skyrmion structure shows long range fluctuations of ferrimagnetic ordering, and above-gap optical excitation reduces the magnetic ordering on a 40 picosecond timescale. (C) 2014 Optical Society of America C1 [Langner, M. C.; Schoenlein, R. W.] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA. [Roy, S.; Mishra, S. K.; Lee, J. C. T.; Shi, X. W.; Hossain, M. A.; Chuang, Y. -D.; Kevan, S. D.] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Adv Light Source, Berkeley, CA 94720 USA. [Roy, S.; Mishra, S. K.; Lee, J. C. T.; Shi, X. W.; Hossain, M. A.; Chuang, Y. -D.; Kevan, S. D.] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Computat Sci Div, Berkeley, CA 94720 USA. [Seki, S.; Tokura, Y.] RIKEN, Ctr Emergent Matter Sci, Wako, Saitama 3510198, Japan. [Seki, S.] Japan Sci & Technol Agcy, PRESTO, Tokyo 1020075, Japan. [Tokura, Y.] Univ Tokyo, Dept Appl Phys, Tokyo 1138656, Japan. [Tokura, Y.] Univ Tokyo, Quantum Phase Elect Ctr, Tokyo 1138656, Japan. RP Langner, MC (reprint author), Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA. NR 4 TC 0 Z9 0 U1 3 U2 5 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2160-9020 BN 978-1-55752-968-8 J9 CONF LASER ELECTR PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BE3EW UT WOS:000370627100488 ER PT S AU Langner, MC Roy, S Kemper, AF Chuang, YD Misra, SK Versteeg, RB Zhu, Y Hertlein, MP Glover, TE Dumesnil, K Schoenlein, RW AF Langner, M. C. Roy, S. Kemper, A. F. Chuang, Y. -D. Misra, S. K. Versteeg, R. B. Zhu, Y. Hertlein, M. P. Glover, T. E. Dumesnil, K. Schoenlein, R. W. GP IEEE TI Transient Exchange Interaction in a Helical Antiferromagnet SO 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) SE Conference on Lasers and Electro-Optics LA English DT Proceedings Paper CT Conference on Lasers and Electro-Optics (CLEO) CY MAY 10-15, 2015 CL San Jose, CA AB We measure dynamics of the helical ordering in the Lanthanide metal Dy resulting from transient changes in the conduction electron Fermi surface and subsequent scattering events that transfer the excitation to the core spin. (C) 2014 Optical Society of America C1 [Langner, M. C.; Zhu, Y.; Schoenlein, R. W.] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA. [Roy, S.; Chuang, Y. -D.; Misra, S. K.; Versteeg, R. B.; Hertlein, M. P.; Glover, T. E.] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Adv Light Source, Berkeley, CA 94720 USA. [Kemper, A. F.] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Computat Sci Div, Berkeley, CA 94720 USA. [Dumesnil, K.] Univ Lorraine, UMR CNRS 7198, Inst Jean Lamour, F-54500 Vandoeuvre Les Nancy, France. RP Langner, MC (reprint author), Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA. NR 6 TC 0 Z9 0 U1 1 U2 3 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2160-9020 BN 978-1-55752-968-8 J9 CONF LASER ELECTR PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BE3EW UT WOS:000370627100375 ER PT S AU Li, CY Wright, JB Liu, S Lu, P Figiel, JJ Leung, B Luk, TS Brener, I Feezell, D Brueck, SRJ Wang, GT AF Li, Changyi Wright, Jeremy B. Liu, Sheng Lu, Ping Figiel, Jeffrey J. Leung, Benjamin Luk, Ting Shan Brener, Igal Feezell, Daniel Brueck, S. R. J. Wang, George T. GP IEEE TI Nonpolar InGaN/GaN multi-quantum-well core-shell nanowire lasers SO 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) SE Conference on Lasers and Electro-Optics LA English DT Proceedings Paper CT Conference on Lasers and Electro-Optics (CLEO) CY MAY 10-15, 2015 CL San Jose, CA AB Lasing is demonstrated from nonpolar III-nitride core-shell multi-quantum-well nanowires. The nanowire lasers were fabricated by coupling a top-down and bottom-up methodology and achieved lasing at wavelengths below the GaN bandedge. C1 [Li, Changyi; Feezell, Daniel; Brueck, S. R. J.] Univ New Mexico, Ctr High Technol Mat, 1313 Goddard St SE, Albuquerque, NM 87106 USA. [Wright, Jeremy B.; Liu, Sheng; Lu, Ping; Figiel, Jeffrey J.; Leung, Benjamin; Luk, Ting Shan; Brener, Igal; Wang, George T.] Sandia Natl Labs, Albuquerque, NM 87185 USA. [Liu, Sheng; Luk, Ting Shan; Brener, Igal] Sandia Natl Labs, Ctr Integrated Nanotechnol, Albuquerque, NM 87185 USA. RP Li, CY (reprint author), Univ New Mexico, Ctr High Technol Mat, 1313 Goddard St SE, Albuquerque, NM 87106 USA. EM chyli@unm.edu NR 2 TC 0 Z9 0 U1 1 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2160-9020 BN 978-1-55752-968-8 J9 CONF LASER ELECTR PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BE3EW UT WOS:000370627101476 ER PT S AU Liao, CT Li, X Haxton, D McCurdy, W Sandhu, A AF Liao, Chen-Ting Li, Xuan Haxton, Daniel McCurdy, William Sandhu, Arvinder GP IEEE TI Using Attosecond Transient Absorption to Study Non-Adiabatic Molecular Dynamics SO 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) SE Conference on Lasers and Electro-Optics LA English DT Proceedings Paper CT Conference on Lasers and Electro-Optics (CLEO) CY MAY 10-15, 2015 CL San Jose, CA AB We investigate superexcited Oxygen using attosecond transient absorption. Spectral lineshape evolution is used to resolve the autoionization dynamics and strong-field control is explored. We find that the symmetry of electronic states plays an important role. C1 [Liao, Chen-Ting; Sandhu, Arvinder] Univ Arizona, Coll Opt Sci, Tucson, AZ 85721 USA. [Li, Xuan; Haxton, Daniel; McCurdy, William] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Chem Sci, Ultrafast Xray Sci Lab, Berkeley, CA 94720 USA. [McCurdy, William] Univ Calif Davis, Dept Chem, Davis, CA 95616 USA. [Sandhu, Arvinder] Univ Arizona, Dept Phys, Tucson, AZ 85721 USA. RP Liao, CT (reprint author), Univ Arizona, Coll Opt Sci, Tucson, AZ 85721 USA. EM sandhu@physics.arizona.edu RI Liao, Chen-Ting/O-4893-2014 NR 7 TC 0 Z9 0 U1 1 U2 3 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2160-9020 BN 978-1-55752-968-8 J9 CONF LASER ELECTR PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BE3EW UT WOS:000370627100344 ER PT S AU Liu, S Li, CY Figiel, J Brener, I Brueck, SRJ Wang, GT AF Liu, Sheng Li, Changyi Figiel, Jeffrey Brener, Igal Brueck, Steven R. J. Wang, George T. GP IEEE TI Wide and reversible tuning of an individual nanowire laser using hydrostatic pressure SO 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) SE Conference on Lasers and Electro-Optics LA English DT Proceedings Paper CT Conference on Lasers and Electro-Optics (CLEO) CY MAY 10-15, 2015 CL San Jose, CA AB We report wide, continuous, and reversible tunable lasing between 367-337nm from single GaN nanowires by applying hydrostatic pressure up to similar to 7GPa. The pressure coefficients observed are 40% larger compared with bulk GaN or GaN microstructures. C1 [Liu, Sheng; Figiel, Jeffrey; Brener, Igal; Wang, George T.] Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. [Liu, Sheng; Brener, Igal] Sandia Natl Labs, Ctr Integrated Nanotechnol, Albuquerque, NM 87185 USA. [Li, Changyi; Brueck, Steven R. J.] Univ New Mexico, Ctr High Technol Mat, Albuquerque, NM 87106 USA. RP Liu, S (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. EM snliu@sandia.gov NR 3 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2160-9020 BN 978-1-55752-968-8 J9 CONF LASER ELECTR PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BE3EW UT WOS:000370627103025 ER PT S AU Lougovski, P Uskov, DB AF Lougovski, Pavel Uskov, Dmitry B. GP IEEE TI Bell State Free Dense Coding with Linear Optics SO 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) SE Conference on Lasers and Electro-Optics LA English DT Proceedings Paper CT Conference on Lasers and Electro-Optics (CLEO) CY MAY 10-15, 2015 CL San Jose, CA ID COMMUNICATION AB We explore the possibility of implementing dense coding with linear optics and coincidence photodetection without Bell state discrimination. We discover that such implementations exist for two-photon in N-mode (N=4,6,8) scenarios and provide examples. (C) 2014 Optical Society of America C1 [Lougovski, Pavel] Oak Ridge Natl Lab, Quantum Informat Sci Grp, Oak Ridge, TN 37831 USA. [Uskov, Dmitry B.] Univ Brescia, Dept Math & Nat Sci, Owensboro, KY 42301 USA. [Uskov, Dmitry B.] Tulane Univ, Dept Phys & Engn Phys, New Orleans, LA 70118 USA. RP Lougovski, P (reprint author), Oak Ridge Natl Lab, Quantum Informat Sci Grp, Oak Ridge, TN 37831 USA. EM lougovskip@ornl.gov; dmitry.uskov@brescia.edu NR 10 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2160-9020 BN 978-1-55752-968-8 J9 CONF LASER ELECTR PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BE3EW UT WOS:000370627100393 ER PT S AU Luk, TS de Ceglia, D Keeler, GA Prasankumar, RP Vincenti, MA Liu, S Scalora, M Sinclair, MB Campione, S AF Luk, Ting S. de Ceglia, Domenico Keeler, Gordon A. Prasankumar, Rohit P. Vincenti, Maria A. Liu, Sheng Scalora, Michael Sinclair, Michael B. Campione, Salvatore GP IEEE TI Third harmonic generation in ultrathin epsilon-near-zero media SO 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) SE Conference on Lasers and Electro-Optics LA English DT Proceedings Paper CT Conference on Lasers and Electro-Optics (CLEO) CY MAY 10-15, 2015 CL San Jose, CA ID WAVE-GUIDES AB We demonstrate efficient third harmonic generation from a 21.6nm-thick indium tin oxide film on glass substrate for a pump fundamental wavelength of 1350nm using the field enhancement properties of optical modes supported by epsilon-near-zero media. C1 [Luk, Ting S.; Keeler, Gordon A.; Prasankumar, Rohit P.; Liu, Sheng; Sinclair, Michael B.; Campione, Salvatore] Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. [Luk, Ting S.; Liu, Sheng; Campione, Salvatore] Sandia Natl Labs, Ctr Integrated Nanotechnol CINT SNL, Albuquerque, NM 87185 USA. [de Ceglia, Domenico; Vincenti, Maria A.] Natl Res Council AMRDEC, Charles M Bowden Res Lab, Redstone Arsenal, AL 35898 USA. [Prasankumar, Rohit P.] Los Alamos Labs, Ctr Integrated Nanotechnol CINT LANL, Los Alamos, NM 87545 USA. [Scalora, Michael] US Army RDECOM, Charles M Bowden Res Lab, AMRDEC, Redstone Arsenal, AL 35898 USA. RP Luk, TS (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. EM tsluk@sandia.gov NR 6 TC 0 Z9 0 U1 1 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2160-9020 BN 978-1-55752-968-8 J9 CONF LASER ELECTR PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BE3EW UT WOS:000370627102167 ER PT S AU Luo, L Chatzakis, I Patz, A Wang, JG AF Luo, Liang Chatzakis, Ioannis Patz, Aaron Wang, Jigang GP IEEE TI Ultrafast Terahertz Probes of Interacting Dark Excitons in Chirality-specific Single-walled Carbon Nanotubes SO 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) SE Conference on Lasers and Electro-Optics LA English DT Proceedings Paper CT Conference on Lasers and Electro-Optics (CLEO) CY MAY 10-15, 2015 CL San Jose, CA AB Ultrafast terahertz intra-excitonic transition similar to 6 meV reveals stable quasi-1D many-exciton states that evolve uniquely from a predominant dark exciton population to complex phase-space filling of both dark and bright pair states in (6,5) SWNTs. C1 [Luo, Liang] Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA. Iowa State Univ, Ames Lab, US DOE, Ames, IA 50011 USA. RP Luo, L (reprint author), Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA. EM jgwang@iastate.edu NR 5 TC 0 Z9 0 U1 1 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2160-9020 BN 978-1-55752-968-8 J9 CONF LASER ELECTR PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BE3EW UT WOS:000370627100184 ER PT S AU Marshall, K Pooser, R Siopsis, G Weedbrook, C AF Marshall, Kevin Pooser, Raphael Siopsis, George Weedbrook, Christian GP IEEE TI Repeat-Until-Success Cubic Phase Gate SO 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) SE Conference on Lasers and Electro-Optics LA English DT Proceedings Paper CT Conference on Lasers and Electro-Optics (CLEO) CY MAY 10-15, 2015 CL San Jose, CA AB Here we introduce an experimentally viable 'repeat-until-success' implementation of the cubic phase gate, required for universal quantum computation, using sequential photon subtractions. Our scheme offers benefits in the expected time until success, although we require a primitive quantum memory. (C) 2014 Optical Society of America C1 [Marshall, Kevin] Univ Toronto, Dept Phys, 60 St George St, Toronto, ON M5S 1A7, Canada. [Pooser, Raphael] Oak Ridge Natl Lab, Quantum Informat Sci Grp, Oak Ridge, TN 37831 USA. [Pooser, Raphael; Siopsis, George] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA. [Weedbrook, Christian] QKD Corp, Toronto, ON M5S 1A7, Canada. RP Marshall, K (reprint author), Univ Toronto, Dept Phys, 60 St George St, Toronto, ON M5S 1A7, Canada. EM marshall@physics.utoronto.ca NR 4 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2160-9020 BN 978-1-55752-968-8 J9 CONF LASER ELECTR PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BE3EW UT WOS:000370627100424 ER PT S AU Mohammad, N Wang, P Friedman, DJ Ramanathan, K Mansfield, L Menon, R AF Mohammad, Nabil Wang, Peng Friedman, Daniel J. Ramanathan, Kannan Mansfield, Lorelle Menon, Rajesh GP IEEE TI Microphotonic spectrum-splitting & concentration for high-efficiency photovoltaics SO 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) SE Conference on Lasers and Electro-Optics LA English DT Proceedings Paper CT Conference on Lasers and Electro-Optics (CLEO) CY MAY 10-15, 2015 CL San Jose, CA AB We present a diffractive microphotonic element that can split solar spectrum into 2 or more spectral bands, and concentrate these bands onto optimal absorbers. We experimentally demonstrated an increase in output power of 35% with a 3-band configuration. C1 [Mohammad, Nabil; Wang, Peng; Menon, Rajesh] Univ Utah, Dept Elect & Comp Engn, Salt Lake City, UT 84112 USA. [Friedman, Daniel J.; Ramanathan, Kannan; Mansfield, Lorelle] Natl Renewable Energy Lab, Golden, CO 80401 USA. RP Mohammad, N (reprint author), Univ Utah, Dept Elect & Comp Engn, Salt Lake City, UT 84112 USA. EM rmenon@eng.utah.edu NR 4 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2160-9020 BN 978-1-55752-968-8 J9 CONF LASER ELECTR PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BE3EW UT WOS:000370627100095 ER PT S AU Muller, EA Pollard, B Bechtel, HA Adato, R Yang, HHU Martin, MC Altug, H Raschke, MB AF Muller, Eric A. Pollard, Benjamin Bechtel, Hans A. Adato, Ronen Yang, Honghua U. Martin, Michael C. Altug, Hatice Raschke, Markus B. GP IEEE TI Infrared Vibrational Molecular Hybridization with a Single Optical Antenna SO 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) SE Conference on Lasers and Electro-Optics LA English DT Proceedings Paper CT Conference on Lasers and Electro-Optics (CLEO) CY MAY 10-15, 2015 CL San Jose, CA AB We observe impedance matched coupling between molecular vibrations and infrared optical antennas. Broadband synchrotron near-field spectroscopy reveals antenna-vibration hybridization, mode splitting, and tip excitation of coupled dark plasmon modes. C1 [Muller, Eric A.; Pollard, Benjamin; Yang, Honghua U.; Raschke, Markus B.] Univ Colorado, Dept Phys, Dept Chem, 390 UCB, Boulder, CO 80309 USA. [Muller, Eric A.; Pollard, Benjamin; Yang, Honghua U.; Raschke, Markus B.] Univ Colorado, JILA, Boulder, CO 80309 USA. [Bechtel, Hans A.; Martin, Michael C.] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Adv Light Source Div, Berkeley, CA 94720 USA. [Adato, Ronen] Boston Univ, Dept Elect & Comp Engn, Boston, MA 02215 USA. [Altug, Hatice] Ecole Polytech Fed Lausanne, Dept Bioengn, CH-1015 Lausanne, Switzerland. RP Raschke, MB (reprint author), Univ Colorado, Dept Phys, Dept Chem, 390 UCB, Boulder, CO 80309 USA. EM markus.raschke@colorado.edu NR 6 TC 0 Z9 0 U1 3 U2 4 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2160-9020 BN 978-1-55752-968-8 J9 CONF LASER ELECTR PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BE3EW UT WOS:000370627100447 ER PT S AU Negres, RA Bass, IL Stanion, K Guss, G Cross, DA Alessi, DA Stolz, CJ Carr, CW AF Negres, R. A. Bass, I. L. Stanion, K. Guss, G. Cross, D. A. Alessi, D. A. Stolz, C. J. Carr, C. W. GP IEEE TI Apparatus and Techniques for Measuring Laser Damage Resistance of Large-Area, Multilayer Dielectric Mirrors for Use with High Energy, Picosecond Lasers SO 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) SE Conference on Lasers and Electro-Optics LA English DT Proceedings Paper CT Conference on Lasers and Electro-Optics (CLEO) CY MAY 10-15, 2015 CL San Jose, CA AB We present techniques for measuring the damage performance of a variety of optical components with ps laser pulses, introduce a novel beam diagnostic technique, and explore the sensitivity of damage resistance to laser spot size for the case of high-reflectivity, multilayer dielectric (MLD) mirrors. C1 [Negres, R. A.; Bass, I. L.; Stanion, K.; Guss, G.; Cross, D. A.; Alessi, D. A.; Stolz, C. J.; Carr, C. W.] Lawrence Livermore Natl Lab, 7000 East Ave, Livermore, CA 94550 USA. RP Negres, RA (reprint author), Lawrence Livermore Natl Lab, 7000 East Ave, Livermore, CA 94550 USA. EM negres2@llnl.gov NR 5 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2160-9020 BN 978-1-55752-968-8 J9 CONF LASER ELECTR PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BE3EW UT WOS:000370627102067 ER PT S AU Ni, XJ Wong, ZJ Wang, Y Zhang, X AF Ni, Xingjie Wong, Zi Jing Wang, Yuan Zhang, Xiang GP IEEE TI Three-Dimensional Metasurface Carpet Cloak SO 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) SE Conference on Lasers and Electro-Optics LA English DT Proceedings Paper CT Conference on Lasers and Electro-Optics (CLEO) CY MAY 10-15, 2015 CL San Jose, CA ID META-SURFACES; LIGHT; REFLECTION AB We experimentally demonstrate a three-dimensional ultra-thin metasurface carpet cloak can cover on an arbitrary-shaped object and make it undetectable by the visible light owing to the phase control capability of the metasurface. C1 [Ni, Xingjie; Wong, Zi Jing; Wang, Yuan; Zhang, Xiang] Univ Calif Berkeley, NSF Nanoscale Sci & Engn Ctr, 5130 Etcheverry Hall, Berkeley, CA 94720 USA. [Zhang, Xiang] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA. RP Zhang, X (reprint author), Univ Calif Berkeley, NSF Nanoscale Sci & Engn Ctr, 5130 Etcheverry Hall, Berkeley, CA 94720 USA. EM xiang@berkeley.edu NR 10 TC 0 Z9 0 U1 1 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2160-9020 BN 978-1-55752-968-8 J9 CONF LASER ELECTR PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BE3EW UT WOS:000370627101037 ER PT S AU Ni, XJ Xiao, J Yang, S Wang, Y Zhang, X AF Ni, Xingjie Xiao, Jun Yang, Sui Wang, Yuan Zhang, Xiang GP IEEE TI Photon Spin Induced Collective Electron Motion on a Metasurface SO 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) SE Conference on Lasers and Electro-Optics LA English DT Proceedings Paper CT Conference on Lasers and Electro-Optics (CLEO) CY MAY 10-15, 2015 CL San Jose, CA ID LIGHT AB Strong spin-orbit interaction can be induced by light-bending metasurfaces. We show that the photon spin momentum can be directly transferred to collective motion of electrons on a conductive metasurface with this interaction. C1 [Ni, Xingjie; Xiao, Jun; Yang, Sui; Wang, Yuan; Zhang, Xiang] Univ Calif Berkeley, NSF Nanoscale Sci & Engn Ctr, 5130 Etcheverry Hall, Berkeley, CA 94720 USA. [Yang, Sui; Zhang, Xiang] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA. RP Zhang, X (reprint author), Univ Calif Berkeley, NSF Nanoscale Sci & Engn Ctr, 5130 Etcheverry Hall, Berkeley, CA 94720 USA. EM xiang@berkeley.edu RI Yang, Sui /H-4417-2016 NR 8 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2160-9020 BN 978-1-55752-968-8 J9 CONF LASER ELECTR PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BE3EW UT WOS:000370627101033 ER PT S AU Otterstrom, N Pooser, RC Lawrie, BJ AF Otterstrom, N. Pooser, R. C. Lawrie, B. J. GP IEEE TI Nonlinear optical magnetometry with accessible in situ optical squeezing SO 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) SE Conference on Lasers and Electro-Optics LA English DT Proceedings Paper CT Conference on Lasers and Electro-Optics (CLEO) CY MAY 10-15, 2015 CL San Jose, CA AB We demonstrate compact and accessible squeezed-light magnetometry using four-wave-mixing in a single hot rubidium vapor cell. This framework enables 4.7 dB of quantum-noise-reduction while simultaneously adding nonlinear-magneto-optical-rotation(NMOR) signals from the probe and conjugate fields. (C) 2014 Optical Society of America C1 [Otterstrom, N.] Brigham Young Univ, Dept Phys & Astron, Provo, UT 84602 USA. [Otterstrom, N.; Pooser, R. C.; Lawrie, B. J.] Oak Ridge Natl Lab, Computat Sci & Engn Div, Quantum Informat Sci Grp, Oak Ridge, TN 37830 USA. RP Lawrie, BJ (reprint author), Oak Ridge Natl Lab, Computat Sci & Engn Div, Quantum Informat Sci Grp, Oak Ridge, TN 37830 USA. EM lawriebj@ornl.gov NR 8 TC 0 Z9 0 U1 1 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2160-9020 BN 978-1-55752-968-8 J9 CONF LASER ELECTR PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BE3EW UT WOS:000370627100286 ER PT S AU Peng, RW Fan, RH Huang, XR Wang, M AF Peng, Ru-Wen Fan, Ren-Hao Huang, Xian-Rong Wang, Mu GP IEEE TI Making Structured Metals Ultrabroadband Transparency by Surface Plasmons SO 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) SE Conference on Lasers and Electro-Optics LA English DT Proceedings Paper CT Conference on Lasers and Electro-Optics (CLEO) CY MAY 10-15, 2015 CL San Jose, CA AB We present theoretically and experimentally that one-dimensional and two-dimensional metallic gratings can become transparent and completely antireflective for extremely broadband electromagnetic waves by relying on surface plasmons or spoof surface plasmons. The investigations may provide guidelines to develop many novel materials and devices, such as transparent conducting panels, antireflective solar cells, and stealth technologies. C1 [Peng, Ru-Wen; Fan, Ren-Hao; Wang, Mu] Nanjing Univ, Natl Lab Solid State Microstruct, Nanjing 210093, Jiangsu, Peoples R China. [Peng, Ru-Wen; Fan, Ren-Hao; Wang, Mu] Nanjing Univ, Sch Phys, Collaborat Innovat Ctr Adv Microstruct, Nanjing 210093, Jiangsu, Peoples R China. [Huang, Xian-Rong] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. RP Peng, RW (reprint author), Nanjing Univ, Natl Lab Solid State Microstruct, Nanjing 210093, Jiangsu, Peoples R China. NR 4 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2160-9020 BN 978-1-55752-968-8 J9 CONF LASER ELECTR PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BE3EW UT WOS:000370627101236 ER PT S AU Phillips, MC Taubman, MS Brumfield, BE Kriesel, J AF Phillips, M. C. Taubman, M. S. Brumfield, B. E. Kriesel, J. GP IEEE TI Analysis of Trace Gas Mixtures Using an External Cavity Quantum Cascade Laser Sensor SO 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) SE Conference on Lasers and Electro-Optics LA English DT Proceedings Paper CT Conference on Lasers and Electro-Optics (CLEO) CY MAY 10-15, 2015 CL San Jose, CA AB We measure and analyze mixtures of trace gases at ppb-ppm levels using an external cavity quantum cascade laser sensor with a 1-second response time. Accurate spectral fits are obtained in the presence of overlapping spectra. C1 [Phillips, M. C.; Taubman, M. S.; Brumfield, B. E.] Pacific NW Natl Lab, Richland, WA 99352 USA. [Kriesel, J.] Optoknowledge Syst Inc, Torrance, CA 90502 USA. RP Phillips, MC (reprint author), Pacific NW Natl Lab, Richland, WA 99352 USA. EM mark.phillips@pnnl.gov NR 1 TC 0 Z9 0 U1 1 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2160-9020 BN 978-1-55752-968-8 J9 CONF LASER ELECTR PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BE3EW UT WOS:000370627101460 ER PT S AU Polyanskiy, MN Babzien, M Pogorelsky, I AF Polyanskiy, Mikhail N. Babzien, Marcus Pogorelsky, Igor GP IEEE TI Multi-Terawatt CO2 Laser with Chirped-Pulse Amplification SO 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) SE Conference on Lasers and Electro-Optics LA English DT Proceedings Paper CT Conference on Lasers and Electro-Optics (CLEO) CY MAY 10-15, 2015 CL San Jose, CA AB A chirped-pulse amplification technique is implemented for the first time in a picosecond CO2 laser. A considerable increase in peak power is achieved, mainly as a result of eliminating nonlinear effects in the optical elements. C1 [Polyanskiy, Mikhail N.; Babzien, Marcus; Pogorelsky, Igor] Brookhaven Natl Lab, Upton, NY 11777 USA. RP Polyanskiy, MN (reprint author), Brookhaven Natl Lab, Upton, NY 11777 USA. EM polyanskiy@bnl.gov NR 3 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2160-9020 BN 978-1-55752-968-8 J9 CONF LASER ELECTR PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BE3EW UT WOS:000370627102320 ER PT S AU Rakhman, A Huang, CN Notcutt, M Liu, Y AF Rakhman, Abdurahim Huang, Chunning Notcutt, Mark Liu, Yun GP IEEE TI Doubly-Resonant Fabry-Perot Cavity for Power Enhancement of Burst-Mode Picosecond Ultraviolet Pulses SO 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) SE Conference on Lasers and Electro-Optics LA English DT Proceedings Paper CT Conference on Lasers and Electro-Optics (CLEO) CY MAY 10-15, 2015 CL San Jose, CA AB We report on a first experimental demonstration of locking a doubly-resonant Fabry-Perot cavity to burst-mode picosecond ultraviolet (UV) pulses by using a temperature controlled dispersion compensation method. This technique will eventually enable the intra cavity power enhancement of burst-mode 402.5MHz/50ps UV laser pulses with a MW level peak power required for the laser assisted H-beam stripping experiment at the Spallation Neutron Source. C1 [Rakhman, Abdurahim] Univ Tennessee, Dept Phys & Astron, 1408 Circle Dr, Knoxville, TN 37996 USA. [Rakhman, Abdurahim; Huang, Chunning; Liu, Yun] Oak Ridge Natl Lab, Spallat Neutron Source, Oak Ridge, TN 37831 USA. [Notcutt, Mark] Stable Laser Syst, Boulder, CO 80301 USA. RP Rakhman, A (reprint author), Univ Tennessee, Dept Phys & Astron, 1408 Circle Dr, Knoxville, TN 37996 USA. EM rahim@ornl.gov NR 3 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2160-9020 BN 978-1-55752-968-8 J9 CONF LASER ELECTR PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BE3EW UT WOS:000370627101385 ER PT S AU Ramezani, H Li, HK Wang, Y Zhang, X AF Ramezani, Hamidreza Li, Hao-kun Wang, Yuan Zhang, Xiang GP IEEE TI PT-symmetric cavities with simultaneous unidirectional lasing and reflectionless modes SO 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) SE Conference on Lasers and Electro-Optics LA English DT Proceedings Paper CT Conference on Lasers and Electro-Optics (CLEO) CY MAY 10-15, 2015 CL San Jose, CA AB Using parity-time (PT) symmetric cavities, we introduce a new family of spectral singularities with highly directional response. At these singularities the PT-symmetric cavity support a simultaneous lasing mode from one side and zero reflection mode from the opposite side. (C) 2014 Optical Society of America C1 [Ramezani, Hamidreza; Li, Hao-kun; Wang, Yuan; Zhang, Xiang] Univ Calif Berkeley, NSF Nanoscale Sci & Engn Ctr, Berkeley, CA 94720 USA. [Zhang, Xiang] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA. RP Ramezani, H (reprint author), Univ Calif Berkeley, NSF Nanoscale Sci & Engn Ctr, Berkeley, CA 94720 USA. EM xiang@berkeley.edu NR 7 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2160-9020 BN 978-1-55752-968-8 J9 CONF LASER ELECTR PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BE3EW UT WOS:000370627100407 ER PT S AU Richter, D Weibring, P Walega, JG Fried, A Spuler, SM Taubman, MS AF Richter, D. Weibring, P. Walega, J. G. Fried, A. Spuler, S. M. Taubman, M. S. GP IEEE TI CAMS - Compact Atmospheric Multi-Species Spectrometer SO 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) SE Conference on Lasers and Electro-Optics LA English DT Proceedings Paper CT Conference on Lasers and Electro-Optics (CLEO) CY MAY 10-15, 2015 CL San Jose, CA AB We present the design, development, and field performance of an airborne mid-IR spectrometer configured for the simultaneous sensitive detection of CH2O (similar to 40 pptv, 1 Hz) and C2H6 (similar to 15 pptv, 1 Hz). C1 [Richter, D.; Weibring, P.; Walega, J. G.; Fried, A.] Univ Colorado, Inst Arctic & Alpine Res, UCB 450, Boulder, CO 80309 USA. [Spuler, S. M.] Natl Ctr Atmospher Res, Earth Observing Lab, Boulder, CO 80307 USA. [Taubman, M. S.] Pacific NW Natl Lab, Richland, WA 99352 USA. RP Richter, D (reprint author), Univ Colorado, Inst Arctic & Alpine Res, UCB 450, Boulder, CO 80309 USA. EM dirk.richter@colorado.edu NR 2 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2160-9020 BN 978-1-55752-968-8 J9 CONF LASER ELECTR PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BE3EW UT WOS:000370627100109 ER PT S AU Riley, N Wisher, M Lewis, S Wagner, C Minello, V Bengtson, R Ditmire, T AF Riley, Nathan Wisher, Matt Lewis, Sean Wagner, Craig Minello, Vincent Bengtson, Roger Ditmire, Todd GP IEEE TI Laser Generation of Scaled Astrophysical Blast Waves in a Dynamically-Significant Magnetic Field SO 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) SE Conference on Lasers and Electro-Optics LA English DT Proceedings Paper CT Conference on Lasers and Electro-Optics (CLEO) CY MAY 10-15, 2015 CL San Jose, CA AB We report preliminary results on the stability of a magnetized laser-launched blast wave scaled to simulate a supernova remnant. Magnetic fields appear to suppress the Vishniac overstability at high mode numbers, possibly facilitating gravitational star formation. C1 [Riley, Nathan; Wisher, Matt; Lewis, Sean; Wagner, Craig; Minello, Vincent; Bengtson, Roger; Ditmire, Todd] Univ Texas Austin, Ctr High Energy Dens Sci, Austin, TX 78712 USA. [Wisher, Matt; Lewis, Sean] Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Riley, N (reprint author), Univ Texas Austin, Ctr High Energy Dens Sci, Austin, TX 78712 USA. EM njr454@ph.utexas.edu NR 6 TC 0 Z9 0 U1 2 U2 3 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2160-9020 BN 978-1-55752-968-8 J9 CONF LASER ELECTR PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BE3EW UT WOS:000370627100289 ER PT S AU Rubenchik, A Wu, S LeBlanc, M Mitchell, S Peterson, N Golosker, I AF Rubenchik, Alexander Wu, Sheldon LeBlanc, Mary Mitchell, Scott Peterson, Noel Golosker, Ilya GP IEEE TI Direct Calorimetric Measurement of Powder Absorptivity SO 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) SE Conference on Lasers and Electro-Optics LA English DT Proceedings Paper CT Conference on Lasers and Electro-Optics (CLEO) CY MAY 10-15, 2015 CL San Jose, CA AB We present a method for direct calorimetric measurement of powder absorptivity using a thin laser illuminated disc. Powder porosity is measured independently and a scheme eliminating the effect of convective and radiative losses is implemented. C1 [Rubenchik, Alexander; Wu, Sheldon; LeBlanc, Mary; Mitchell, Scott; Peterson, Noel; Golosker, Ilya] Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. RP Rubenchik, A (reprint author), Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. EM rubenchik1@llnl.gov NR 2 TC 0 Z9 0 U1 1 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2160-9020 BN 978-1-55752-968-8 J9 CONF LASER ELECTR PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BE3EW UT WOS:000370627100101 ER PT S AU Sampat, S Karan, NS Keller, AM Piryatinski, A Roslyak, O Hanson, CJ Ghosh, Y Htoon, H Hollingsworth, JA Malko, AV AF Sampat, Siddharth Karan, Niladri S. Keller, Aaron M. Piryatinski, Andrei Roslyak, Oleksiy Hanson, Christina J. Ghosh, Yagnaseni Htoon, Han Hollingsworth, Jennifer A. Malko, Anton V. GP IEEE TI Plasmonic Giant Semiconductor Nanocrystals with Enhanced Light Output and Suppressed Blinking for Biomedical Applications SO 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) SE Conference on Lasers and Electro-Optics LA English DT Proceedings Paper CT Conference on Lasers and Electro-Optics (CLEO) CY MAY 10-15, 2015 CL San Jose, CA C1 [Sampat, Siddharth; Malko, Anton V.] Univ Texas Dallas, Dept Phys, Richardson, TX 75080 USA. [Karan, Niladri S.; Keller, Aaron M.; Hanson, Christina J.; Ghosh, Yagnaseni; Htoon, Han; Hollingsworth, Jennifer A.] Los Alamos Natl Lab, Mat Phys & Applicat Div, Ctr Integrated Nanotechnol, Los Alamos, NM 87545 USA. [Piryatinski, Andrei] Los Alamos Natl Lab, Theoret Div, Phys Condensed Matter & Complex Syst, Los Alamos, NM 87545 USA. [Roslyak, Oleksiy] Fordham Univ, Dept Phys, Bronx, NY 10458 USA. RP Sampat, S (reprint author), Univ Texas Dallas, Dept Phys, Richardson, TX 75080 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2160-9020 BN 978-1-55752-968-8 J9 CONF LASER ELECTR PY 2015 PG 1 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BE3EW UT WOS:000370627100479 ER PT S AU Sautter, J Staude, I Decker, M Rusak, E Brener, I Neshev, DN Kivshar, YS AF Sautter, Juergen Staude, Isabelle Decker, Manuel Rusak, Evgenia Brener, Igal Neshev, Dragomir N. Kivshar, Yuri S. GP IEEE TI Liquid Crystal Tuning of All-dielectric Metasurfaces SO 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) SE Conference on Lasers and Electro-Optics LA English DT Proceedings Paper CT Conference on Lasers and Electro-Optics (CLEO) CY MAY 10-15, 2015 CL San Jose, CA AB We experimentally realize active tuning of electric and magnetic resonances of all-dielectric optical metasurfaces based on the temperature-dependent refractive-index change of liquid crystals. We achieve 40 nm spectral tuning and modulation contrast of 500%. (C) 2014 Optical Society of America C1 [Sautter, Juergen; Staude, Isabelle; Decker, Manuel; Rusak, Evgenia; Neshev, Dragomir N.; Kivshar, Yuri S.] Australian Natl Univ, Res Sch Phys & Engn, Nonlinear Phys Ctr, Canberra, ACT, Australia. [Brener, Igal] Sandia Natl Labs, Ctr Integrated Nanotechnol, POB 5800, Albuquerque, NM 87185 USA. RP Sautter, J (reprint author), Australian Natl Univ, Res Sch Phys & Engn, Nonlinear Phys Ctr, Canberra, ACT, Australia. RI Neshev, Dragomir/A-3759-2008 OI Neshev, Dragomir/0000-0002-4508-8646 NR 4 TC 0 Z9 0 U1 1 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2160-9020 BN 978-1-55752-968-8 J9 CONF LASER ELECTR PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BE3EW UT WOS:000370627100378 ER PT S AU Schaake, J Evans, PG Pooser, RC AF Schaake, J. Evans, P. G. Pooser, R. C. GP IEEE TI Compressive Imaging of Broadband Single-Photon Sources With Superconducting Detectors SO 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) SE Conference on Lasers and Electro-Optics LA English DT Proceedings Paper CT Conference on Lasers and Electro-Optics (CLEO) CY MAY 10-15, 2015 CL San Jose, CA AB We experimentally characterize the spatio-spectral properties of photon pairs generated by spontaneous parametric down-conversion in a Type-0 PPKTP waveguide using compressive imaging techniques combined superconducting single photon detectors. C1 [Schaake, J.] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA. [Evans, P. G.; Pooser, R. C.] Oak Ridge Natl Lab, Quantum Informat Sci Grp, Oak Ridge, TN 37831 USA. RP Schaake, J (reprint author), Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA. EM jschaake@utk.edu NR 10 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2160-9020 BN 978-1-55752-968-8 J9 CONF LASER ELECTR PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BE3EW UT WOS:000370627101249 ER PT S AU Schultze, M Ramasesha, K Bothschafter, E Sommer, A Pemmaraju, CD Sato, SA Whitmore, D Gandman, A Prell, JS Borja, LJ Prendergast, D Yabana, K Neumark, DM Krausz, F Leone, SR AF Schultze, M. Ramasesha, K. Bothschafter, E. Sommer, A. Pemmaraju, C. D. Sato, S. A. Whitmore, D. Gandman, A. Prell, J. S. Borja, L. J. Prendergast, D. Yabana, K. Neumark, D. M. Krausz, F. Leone, S. R. GP IEEE TI Attosecond Spectroscopy of Band-gap Dynamics SO 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) SE Conference on Lasers and Electro-Optics LA English DT Proceedings Paper CT Conference on Lasers and Electro-Optics (CLEO) CY MAY 10-15, 2015 CL San Jose, CA AB The ability to transfer electrons from valence to conduction band states in a semiconductor is the basis of modern electronics. Here, attosecond spectroscopy is used to resolve this process in real-time. The excitation of electrons across the band-gap of silicon by few-cycle laser pulses is found to induce lasting modifications of the XUV absorbance spectrum in steps synchronized with the laser electric field oscillations, indicative of light-field induced electron tunneling [1]. In contrast, in SiO2, a dielectric with 9 eV band-gap, similar excitation pulses are found to cause a transient field-induced polarizability without lasting population transfer [2]. C1 [Schultze, M.; Krausz, F.] Univ Munich, Fak Phys, Coulombwall 1, D-85748 Garching, Germany. [Schultze, M.; Bothschafter, E.; Sommer, A.; Krausz, F.] Max Planck Inst Quantum Opt, D-85748 Garching, Germany. [Ramasesha, K.; Whitmore, D.; Gandman, A.; Prell, J. S.; Borja, L. J.; Neumark, D. M.; Leone, S. R.] Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. [Pemmaraju, C. D.; Prendergast, D.] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Mol Foundry, Berkeley, CA 94720 USA. [Sato, S. A.; Yabana, K.] Univ Tsukuba, Grad Sch Pure & Appl Sci, Tsukuba, Ibaraki 3058571, Japan. [Yabana, K.] Univ Tsukuba, Ctr Computat Sci, Tsukuba, Ibaraki 3058577, Japan. [Neumark, D. M.; Leone, S. R.] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Chem Sci, Berkeley, CA 94720 USA. [Leone, S. R.] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. RP Schultze, M (reprint author), Univ Munich, Fak Phys, Coulombwall 1, D-85748 Garching, Germany. EM martin.schultze@mpq.mpg.de RI Sato, Shunsuke/I-3294-2015; Neumark, Daniel/B-9551-2009 OI Sato, Shunsuke/0000-0001-9543-2620; Neumark, Daniel/0000-0002-3762-9473 NR 2 TC 0 Z9 0 U1 0 U2 4 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2160-9020 BN 978-1-55752-968-8 J9 CONF LASER ELECTR PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BE3EW UT WOS:000370627100343 ER PT S AU Shcherbakov, MR Neshev, DN Hopkins, B Shorokhov, AS Staude, I Melik-Gaykazyan, EV Miroshnichenko, A Brener, I Fedyanin, AA Kivshar, YS AF Shcherbakov, Maxim R. Neshev, Dragomir N. Hopkins, Ben Shorokhov, Alexander S. Staude, Isabelle Melik-Gaykazyan, Elizaveta V. Miroshnichenko, Andrey Brener, Igal Fedyanin, Andrey A. Kivshar, Yuri S. GP IEEE TI Third-Harmonic Generation from Silicon Oligomers and Metasurfaces SO 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) SE Conference on Lasers and Electro-Optics LA English DT Proceedings Paper CT Conference on Lasers and Electro-Optics (CLEO) CY MAY 10-15, 2015 CL San Jose, CA ID METAMATERIALS AB Third-harmonic generation spectroscopy of silicon oligomers and metasurfaces reveals the nonlinear spectra reshaping with electric and magnetic dipolar Mie-type resonances and up-conversion increase by two orders of magnitude as compared to the bulk silicon. (C) 2014 Optical Society of America C1 [Shcherbakov, Maxim R.; Shorokhov, Alexander S.; Melik-Gaykazyan, Elizaveta V.; Fedyanin, Andrey A.] Moscow MV Lomonosov State Univ, Fac Phys, Moscow 119991, Russia. [Neshev, Dragomir N.; Hopkins, Ben; Staude, Isabelle; Miroshnichenko, Andrey; Kivshar, Yuri S.] Australian Natl Univ, Res Sch Phys & Engn, Nonlinear Phys Ctr, Canberra, ACT 2602, Australia. [Brener, Igal] Sandia Natl Labs, Ctr Integrated Nanotechnol, Albuquerque, NM 87185 USA. RP Shcherbakov, MR (reprint author), Moscow MV Lomonosov State Univ, Fac Phys, Moscow 119991, Russia. EM shcherbakov@nanolab.phys.msu.ru RI Shorokhov, Alexander/H-5523-2015; Neshev, Dragomir/A-3759-2008; Melik-Gaykazyan, Elizaveta/J-9073-2015 OI Neshev, Dragomir/0000-0002-4508-8646; Melik-Gaykazyan, Elizaveta/0000-0001-7633-2376 NR 6 TC 0 Z9 0 U1 1 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2160-9020 BN 978-1-55752-968-8 J9 CONF LASER ELECTR PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BE3EW UT WOS:000370627100193 ER PT S AU Sun, B Almeida, DB Singh, R Diederich, GM Siemens, ME Padilha, LA Bae, WK Pietryga, JM Klimov, VI Cundiff, ST AF Sun, B. Almeida, D. B. Singh, R. Diederich, G. M. Siemens, M. E. Padilha, L. A. Bae, W. K. Pietryga, J. M. Klimov, V. I. Cundiff, S. T. GP IEEE TI Two Dimensional Coherent Spectroscopy of CdSe/ZnS Colloidal Quantum Dots at Cryogenic Temperatures SO 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) SE Conference on Lasers and Electro-Optics LA English DT Proceedings Paper CT Conference on Lasers and Electro-Optics (CLEO) CY MAY 10-15, 2015 CL San Jose, CA AB We demonstrate 2D coherent spectroscopy of CdSe/ZnS nanocrystals and measure the exciton homogeneous linewidth as a function of temperature from 10K to 300K. The specra reveal contributions to the linewidth from discrete acoustic phonon modes. (C) 2014 Optical Society of America C1 [Sun, B.; Almeida, D. B.; Singh, R.; Cundiff, S. T.] NIST, JILA, Boulder, CO 80309 USA. [Sun, B.; Almeida, D. B.; Singh, R.; Cundiff, S. T.] Univ Colorado, Boulder, CO 80309 USA. [Singh, R.; Cundiff, S. T.] Univ Colorado, Dept Phys, Boulder, CO 80309 USA. [Diederich, G. M.; Siemens, M. E.] Univ Denver, Dept Phys & Astron, Denver, CO 80208 USA. [Padilha, L. A.] Univ Estadual Campinas, Inst Fis Gleb Wataghin, BR-13083970 Campinas, SP, Brazil. [Bae, W. K.] Korea Inst Sci & Technol, Photoelect Hybrid Res Ctr, Seoul 136791, South Korea. [Pietryga, J. M.; Klimov, V. I.] Los Alamos Natl Lab, Div Chem, Los Alamos, NM 87545 USA. RP Sun, B (reprint author), NIST, JILA, Boulder, CO 80309 USA. EM cundiff@jila.colorado.edu NR 3 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2160-9020 BN 978-1-55752-968-8 J9 CONF LASER ELECTR PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BE3EW UT WOS:000370627101279 ER PT S AU Tochitsky, SY Gong, C Pigeon, JJ Fiuza, F Joshi, C AF Tochitsky, S. Ya. Gong, C. Pigeon, J. J. Fiuza, F. Joshi, C. GP IEEE TI He Ion Acceleration in Near Critical Density Plasma SO 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) SE Conference on Lasers and Electro-Optics LA English DT Proceedings Paper CT Conference on Lasers and Electro-Optics (CLEO) CY MAY 10-15, 2015 CL San Jose, CA AB The CO2 laser-plasma interactions are uniquely placed for Shock Wave Acceleration of He or other light ions. We report on experimental and numerical studies of He ion acceleration in a gas jet plasma. C1 [Tochitsky, S. Ya.; Gong, C.; Pigeon, J. J.; Joshi, C.] Univ Calif Los Angeles, Dept Elect Engn, Neptune Lab, 405 Hilgard Ave, Los Angeles, CA 90095 USA. [Fiuza, F.] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Tochitsky, SY (reprint author), Univ Calif Los Angeles, Dept Elect Engn, Neptune Lab, 405 Hilgard Ave, Los Angeles, CA 90095 USA. EM sergei12@ucla.edu NR 4 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2160-9020 BN 978-1-55752-968-8 J9 CONF LASER ELECTR PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BE3EW UT WOS:000370627100291 ER PT S AU Ulbricht, R Dong, S Schwartz, J Hyeon-Deuk, K Tanimura, Y Krishna, MBM Dani, KM Loh, ZH AF Ulbricht, Ronald Dong, Shuo Schwartz, Julian Hyeon-Deuk, Kim Tanimura, Yoshitaka Krishna, M. Bala Murali Dani, Keshav M. Loh, Zhi-Heng GP IEEE TI Ultrafast Photo-Excitation Dynamics of Nitrogen-Vacancy Defects in Diamond SO 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) SE Conference on Lasers and Electro-Optics LA English DT Proceedings Paper CT Conference on Lasers and Electro-Optics (CLEO) CY MAY 10-15, 2015 CL San Jose, CA AB Using transient absorption spectroscopy we investigate the ultrafast dynamics of the electronic excited state of nitrogen-vacancy defects in diamond for temperatures 10K-300K, observing vibrational relaxation times of 40fs and temperature-dependent bi-exponential anisotropy dynamics related to electron motion between the Jahn-Teller-distorted orbitals. C1 [Ulbricht, Ronald; Dong, Shuo; Loh, Zhi-Heng] Nanyang Technol Univ, Div Chem & Biol Chem, Singapore 637371, Singapore. [Ulbricht, Ronald; Dong, Shuo; Loh, Zhi-Heng] Nanyang Technol Univ, Div Phys & Appl Phys, Sch Phys & Math Sci, Singapore 637371, Singapore. [Ulbricht, Ronald] Univ Colorado, Dept Phys, Dept Chem, Boulder, CO 80309 USA. [Ulbricht, Ronald] Univ Colorado, JILA, Boulder, CO 80309 USA. [Schwartz, Julian] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Accelerator & Fus Res Div, Berkeley, CA 94720 USA. [Hyeon-Deuk, Kim; Tanimura, Yoshitaka] Kyoto Univ, Grad Sch Sci, Dept Chem, Kyoto 6068502, Japan. [Krishna, M. Bala Murali; Dani, Keshav M.] Grad Univ, Okinawa Inst Sci & Technol, Femtosecond Spect Unit, Okinawa 9040495, Japan. RP Loh, ZH (reprint author), Nanyang Technol Univ, Div Chem & Biol Chem, Singapore 637371, Singapore. EM zhiheng@ntu.edu.sg RI Loh, Zhi-Heng/B-6952-2011 OI Loh, Zhi-Heng/0000-0001-9729-9632 NR 3 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2160-9020 BN 978-1-55752-968-8 J9 CONF LASER ELECTR PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BE3EW UT WOS:000370627100431 ER PT S AU Wolf, O Campione, S Benz, A Ravikumar, AP Liu, S Kadlec, EA Shaner, EA Klem, JF Sinclair, MB Brener, I AF Wolf, Omri Campione, Salvatore Benz, Alexander Ravikumar, Arvind P. Liu, Sheng Kadlec, Emil A. Shaner, Eric A. Klem, John F. Sinclair, Michael B. Brener, Igal GP IEEE TI Coherent Second Harmonic Generation in a Quantum Well-Metasurface Coupled System SO 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) SE Conference on Lasers and Electro-Optics LA English DT Proceedings Paper CT Conference on Lasers and Electro-Optics (CLEO) CY MAY 10-15, 2015 CL San Jose, CA AB Strongly coupling metallic nanoresonators with specially designed intersubband-transitions in quantum-wells results in efficient, saturation-limited second-harmonic (SH) generation. This method also grants full control over the polarization and phase-front of the emitted SH radiation. C1 [Wolf, Omri; Campione, Salvatore; Benz, Alexander; Liu, Sheng; Brener, Igal] Sandia Natl Labs, Ctr Integrated Nanotechnol, POB 5800, Albuquerque, NM 87185 USA. [Wolf, Omri; Campione, Salvatore; Benz, Alexander; Liu, Sheng; Kadlec, Emil A.; Shaner, Eric A.; Klem, John F.; Sinclair, Michael B.; Brener, Igal] Sandia Natl Labs, Ctr Integrated Nanotechnol, Albuquerque, NM 87185 USA. [Ravikumar, Arvind P.] Princeton Univ, Dept Elect Engn, Princeton, NJ 08544 USA. RP Wolf, O (reprint author), Sandia Natl Labs, Ctr Integrated Nanotechnol, POB 5800, Albuquerque, NM 87185 USA. EM owolf@sandia.gov; ibrener@sandia.gov RI Ravikumar, Arvind/L-1580-2016 NR 6 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2160-9020 BN 978-1-55752-968-8 J9 CONF LASER ELECTR PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BE3EW UT WOS:000370627102345 ER PT S AU Yan, AD Chen, RZ Poole, ZL Ohodnicki, P Elsmann, T Habisreuther, T Rothhardt, M Bartelt, H Chen, KP AF Yan, Aidong Chen, Rongzhang Poole, Zsolt L. Ohodnicki, Paul Elsmann, Tino Habisreuther, Tobias Rothhardt, Manfred Bartelt, Hartmut Chen, Kevin P. GP IEEE TI Fiber Optical Chemical Sensors Rated for 800 degrees C Operation SO 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) SE Conference on Lasers and Electro-Optics LA English DT Proceedings Paper CT Conference on Lasers and Electro-Optics (CLEO) CY MAY 10-15, 2015 CL San Jose, CA AB A high-temperature fiber optical hydrogen sensor is demonstrated. The sensor is based on single-crystal sapphire fiber coated with nanostructured Pd-doped TiO2 thin film. The sensitivity of the sensor was evaluated for hydrogen concentrations varying from 0.02 % to 3% at temperature up to 800 degrees C. C1 [Yan, Aidong; Chen, Rongzhang; Poole, Zsolt L.; Chen, Kevin P.] Univ Pittsburg, Dept Elect & Comp Engn, Pittsburgh, PA 15261 USA. [Ohodnicki, Paul] Natl Energy Technol Lab, Pittsburgh, PA 15236 USA. [Elsmann, Tino; Habisreuther, Tobias; Rothhardt, Manfred; Bartelt, Hartmut] Leibniz Inst Photon Technol, D-07745 Jena, Germany. RP Chen, KP (reprint author), Univ Pittsburg, Dept Elect & Comp Engn, Pittsburgh, PA 15261 USA. EM kchen@engr.pitt.edu NR 7 TC 0 Z9 0 U1 1 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2160-9020 BN 978-1-55752-968-8 J9 CONF LASER ELECTR PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BE3EW UT WOS:000370627102268 ER PT S AU Yang, S Ni, XJ Yin, XB Kante, B Wang, Y Zhang, X AF Yang, Sui Ni, Xingjie Yin, Xiaobo Kante, Boubacar Wang, Yuan Zhang, Xiang GP IEEE TI Metamaterials Assembled by Light SO 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) SE Conference on Lasers and Electro-Optics LA English DT Proceedings Paper CT Conference on Lasers and Electro-Optics (CLEO) CY MAY 10-15, 2015 CL San Jose, CA AB Metamaterials are designed to achieve unprecedented light-matter interactions. Here we demonstrate a novel viable and scalable assembly route to optical metamaterials with structures dictated by their own light-matter interactions. C1 [Yang, Sui; Ni, Xingjie; Yin, Xiaobo; Kante, Boubacar; Wang, Yuan; Zhang, Xiang] Univ Calif Berkeley, NSF Nanoscale Sci & Engn Ctr NSEC, 3112 Etcheverry Hall, Berkeley, CA 94720 USA. [Yang, Sui; Zhang, Xiang] Univ Calif Berkeley, Coll Engn, Appl Sci & Technol, Berkeley, CA 94720 USA. [Yang, Sui; Zhang, Xiang] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA. RP Zhang, X (reprint author), Univ Calif Berkeley, NSF Nanoscale Sci & Engn Ctr NSEC, 3112 Etcheverry Hall, Berkeley, CA 94720 USA. EM suiyang@berkeley.edu RI Yin, Xiaobo/A-4142-2011; Yang, Sui /H-4417-2016 NR 7 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2160-9020 BN 978-1-55752-968-8 J9 CONF LASER ELECTR PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BE3EW UT WOS:000370627102217 ER PT S AU Yang, YM Kravchenko, II Briggs, DP Valentine, J AF Yang, Yuanmu Kravchenko, Ivan. I. Briggs, Daryl. P. Valentine, Jason GP IEEE TI Dielectric Metasurface Analogue of Electromagnetically Induced Transparency SO 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) SE Conference on Lasers and Electro-Optics LA English DT Proceedings Paper CT Conference on Lasers and Electro-Optics (CLEO) CY MAY 10-15, 2015 CL San Jose, CA ID METAMATERIALS AB We present an experimental demonstration of a metasurface analogue of electromagnetically induced transparency based on silicon instead of lossy plasmonic metal, therefore achieved a record-high quality factor of 483 and a sensing figure-of-merit of 103. (C) 2014 Optical Society of America C1 [Yang, Yuanmu] Vanderbilt Univ, Interdisciplinary Mat Sci Program, Nashville, TN 37212 USA. [Kravchenko, Ivan. I.; Briggs, Daryl. P.] Oak Ridge Natl Lab, Ctr Nanophase Mat Sci, Oak Ridge, TN 37831 USA. [Valentine, Jason] Vanderbilt Univ, Dept Mech Engn, Nashville, TN 37212 USA. RP Valentine, J (reprint author), Vanderbilt Univ, Dept Mech Engn, Nashville, TN 37212 USA. EM jason.g.valentine@vanderbilt.edu RI Kravchenko, Ivan/K-3022-2015; Yang, Yuanmu/J-3187-2012 OI Kravchenko, Ivan/0000-0003-4999-5822; Yang, Yuanmu/0000-0002-5264-0822 NR 6 TC 0 Z9 0 U1 1 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2160-9020 BN 978-1-55752-968-8 J9 CONF LASER ELECTR PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BE3EW UT WOS:000370627101024 ER PT S AU Yang, Z Albrecht, AR Cederberg, JG Sheik-Bahae, M AF Yang, Zhou Albrecht, Alexander R. Cederberg, Jeffrey G. Sheik-Bahae, Mansoor GP IEEE TI DBR-free semiconductor disk lasers SO 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) SE Conference on Lasers and Electro-Optics LA English DT Proceedings Paper CT Conference on Lasers and Electro-Optics (CLEO) CY MAY 10-15, 2015 CL San Jose, CA AB We demonstrate a novel DBR-free semiconductor disk laser, where multiple quantum well active region is fusion bonded directly onto a diamond heat spreader. CW output powers of 2.5 W have been demonstrated at 1150 nm. C1 [Yang, Zhou; Albrecht, Alexander R.; Sheik-Bahae, Mansoor] Univ New Mexico, Dept Phys & Astron, Albuquerque, NM 87131 USA. [Cederberg, Jeffrey G.] Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Yang, Z (reprint author), Univ New Mexico, Dept Phys & Astron, Albuquerque, NM 87131 USA. EM zyang01@unm.edu NR 4 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2160-9020 BN 978-1-55752-968-8 J9 CONF LASER ELECTR PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BE3EW UT WOS:000370627102033 ER PT S AU Ye, Y Yin, XB Wang, HL Ye, ZL Zhu, HY Wang, Y Zhao, JH Zhang, X AF Ye, Yu Yin, Xiaobo Wang, Hailong Ye, Ziliang Zhu, Hanyu Wang, Yuan Zhao, Jianhua Zhang, Xiang GP IEEE TI Electrical Valley Excitation by Spin Injection in Monolayer TMDC SO 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) SE Conference on Lasers and Electro-Optics LA English DT Proceedings Paper CT Conference on Lasers and Electro-Optics (CLEO) CY MAY 10-15, 2015 CL San Jose, CA AB The spin degree of freedom (DOF) of electrons was exploited for information processes such as magnetoresistive random-access memory and gave birth to the field of spintronics. Recently, the valley index, a new DOF, was discovered originated from an unbalanced carrier distribution in the momentum space in atomic membrane transition metal dichalcogenides (TMDCs), and optical valley excitation has been observed. However, electrical control of valley freedom remains the major challenge for realizing its potential in electronics. Here, we demonstrate electrically driven valley polarization and report a new scheme of electronic devices combining both spin and valley DOFs. Valley polarization is electrically generated through spin injection and measured by the helicity of electroluminescence. The electrical generation and the control of valley polarization in 2D semiconductors open a new dimension for spin-valley based electronics. C1 [Ye, Yu; Yin, Xiaobo; Ye, Ziliang; Zhu, Hanyu; Wang, Yuan; Zhang, Xiang] Univ Calif Berkeley, NSF Nanoscale Sci & Engn Ctr, 3112 Etcheverry Hall, Berkeley, CA 94720 USA. [Yin, Xiaobo] Univ Colorado, Dept Mech Engn, Boulder, CO 80309 USA. [Yin, Xiaobo] Univ Colorado, Mat Sciecne & Engn Program, Boulder, CO 80309 USA. [Wang, Hailong; Zhao, Jianhua] Chinese Acad Sci, Inst Semicond, State Key Lab Superlattices & Microstruct, Beijing 10083, Peoples R China. [Zhang, Xiang] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA. RP Ye, Y (reprint author), Univ Calif Berkeley, NSF Nanoscale Sci & Engn Ctr, 3112 Etcheverry Hall, Berkeley, CA 94720 USA. EM Xiang@berkeley.edu RI Yin, Xiaobo/A-4142-2011; Wang, Hailong/C-7859-2013 NR 7 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2160-9020 BN 978-1-55752-968-8 J9 CONF LASER ELECTR PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BE3EW UT WOS:000370627102256 ER PT S AU Ye, Y Wong, ZJ Lu, XF Zhu, HY Wang, Y Chen, XH Zhang, X AF Ye, Yu Wong, Zi Jing Lu, Xiufang Zhu, Hanyu Wang, Yuan Chen, Xianhui Zhang, Xiang GP IEEE TI Monolayer Tungsten Disulfide Laser SO 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) SE Conference on Lasers and Electro-Optics LA English DT Proceedings Paper CT Conference on Lasers and Electro-Optics (CLEO) CY MAY 10-15, 2015 CL San Jose, CA ID VALLEY POLARIZATION; MOS2 AB When transition metal dichalcogenide (TMDC) crystals are thinned to monolayers, they undergo an indirect to direct bandgap transition, enabling rich electroluminescent and photoluminescent behaviors. Coupling and integration of TMDC monolayers with photonic crystal and distributed Bragg reflector microcavities have recently been reported with Purcell enhancement of spontaneous emission and strong light-matter interaction. However, realization of laser - a fundamental building block of optoelectronic system - remains a bottleneck, mainly due to the limited overall materials gain volume and difficulty to design efficient optical confinement structure. In fact, the quantum confinement on these layered d-electron materials leads to layer-dependent evolution of electronic structure with step like density of states for monolayers comparing to their bulk counterparts, Making TMDC monolayers a unique optical gain medium for superior lasing characteristics. Here, we report the first realization of monolayer tungsten disulfide (WS2) laser embedded in a microdisk resonator. To reduce the 2D material lasing threshold, we utilized a whispering gallery mode resonator with a high quality factor. The Si3N4/WS2/HSQ sandwich configuration provides a strong feedback and mode overlap. An excitonic laser emission has bee observed in the visible wavelength. Our work marks a major step towards monolayer-based on-chip active optoelectronics and integrated 2D photonic platforms for new optical communication and computing applications. C1 [Ye, Yu; Wong, Zi Jing; Zhu, Hanyu; Wang, Yuan; Zhang, Xiang] Univ Calif Berkeley, NSF Nanoscale Sci & Engn Ctr, 3112 Etcheverry Hall, Berkeley, CA 94720 USA. [Lu, Xiufang; Chen, Xianhui] Univ Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Anhui, Peoples R China. [Lu, Xiufang; Chen, Xianhui] Univ Sci & Technol China, Dept Phys, Hefei 230026, Anhui, Peoples R China. [Zhang, Xiang] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA. RP Ye, Y (reprint author), Univ Calif Berkeley, NSF Nanoscale Sci & Engn Ctr, 3112 Etcheverry Hall, Berkeley, CA 94720 USA. EM Xiang@berkeley.edu NR 4 TC 0 Z9 0 U1 2 U2 3 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2160-9020 BN 978-1-55752-968-8 J9 CONF LASER ELECTR PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BE3EW UT WOS:000370627101481 ER PT S AU Zhou, M Yi, SY Luk, TS Gan, QQ Yu, ZF AF Zhou, Ming Yi, Soongyu Luk, Ting Shan Gan, Qiaoqiang Yu, Zongfu GP IEEE TI The analog of superradiant emission in thermal emitters SO 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) SE Conference on Lasers and Electro-Optics LA English DT Proceedings Paper CT Conference on Lasers and Electro-Optics (CLEO) CY MAY 10-15, 2015 CL San Jose, CA AB The superradiant spontaneous emission is caused by the collective interaction of quantum emitters. Such collective interaction also exists in nanoscale resonant thermal emitters, resulting in the analog of superradiance in thermal emission. C1 [Zhou, Ming; Yi, Soongyu; Yu, Zongfu] Univ Wisconsin, Dept Elect & Comp Engn, 1415 Johnson Dr, Madison, WI 53706 USA. [Luk, Ting Shan] Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. [Gan, Qiaoqiang] SUNY Buffalo, Dept Elect & Comp Engn, Buffalo, NY 14260 USA. RP Zhou, M (reprint author), Univ Wisconsin, Dept Elect & Comp Engn, 1415 Johnson Dr, Madison, WI 53706 USA. EM mzhou34@wisc.edu NR 3 TC 0 Z9 0 U1 2 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2160-9020 BN 978-1-55752-968-8 J9 CONF LASER ELECTR PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BE3EW UT WOS:000370627100357 ER PT S AU Zhou, T Ruppe, J Zhu, C Hu, IN Nees, J Wilcox, R Leemans, W Galvanauskas, A AF Zhou, Tong Ruppe, John Zhu, Cheng Hu, I-Ning Nees, John Wilcox, Russell Leemans, Wim Galvanauskas, Almantas GP IEEE TI Coherent Pulse Stacking Amplification using Cascaded and Multiplexed Gires-Tournois Interferometers SO 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) SE Conference on Lasers and Electro-Optics LA English DT Proceedings Paper CT Conference on Lasers and Electro-Optics (CLEO) CY MAY 10-15, 2015 CL San Jose, CA AB We show stacking of multiple equal-amplitude pulses into a single pulse using properly configured sequences of Gires-Tournois interferometers, which in conjunction of chirped pulse amplification in fibers can enable large increase in extractable pulse energies. C1 [Zhou, Tong; Ruppe, John; Zhu, Cheng; Hu, I-Ning; Nees, John; Galvanauskas, Almantas] Univ Michigan, Ctr Ultrafast Opt Sci, Ann Arbor, MI 48109 USA. [Wilcox, Russell; Leemans, Wim] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. RP Zhou, T (reprint author), Univ Michigan, Ctr Ultrafast Opt Sci, Ann Arbor, MI 48109 USA. EM tongzhou@umich.edu RI Nees, John/P-4905-2016 OI Nees, John/0000-0001-8277-9123 NR 4 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2160-9020 BN 978-1-55752-968-8 J9 CONF LASER ELECTR PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BE3EW UT WOS:000370627102020 ER PT S AU Zuo, D Liu, R Mabon, J He, ZY Liu, S Zhang, YH Kadlec, EA Olson, B Shaner, EA Wasserman, D AF Zuo, D. Liu, R. Mabon, J. He, Z. -Y. Liu, S. Zhang, Y. -H. Kadlec, E. A. Olson, B. Shaner, E. A. Wasserman, D. GP IEEE TI Diffusion Characterization Using Electron Beam Induced Current and Time-Resolved Photoluminescence of InAs/InAsSb Type-II Superlattices SO 2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) SE Conference on Lasers and Electro-Optics LA English DT Proceedings Paper CT Conference on Lasers and Electro-Optics (CLEO) CY MAY 10-15, 2015 CL San Jose, CA AB We present the characterization of minority carrier diffusion length and surface recombination velocity, as well as vertical diffusivity and mobility by performing an electron beam induced current measurement in addition to an optical lifetime measurement. (C)2015 Optical Society of America C1 [Zuo, D.; Liu, R.; Wasserman, D.] Univ Illinois, Dept Elect & Comp Engn, 1406 W Green St, Urbana, IL 61801 USA. [Mabon, J.] Univ Illinois, Frederick Seitz Mat Res Lab, Urbana, IL 61801 USA. [He, Z. -Y.; Liu, S.; Zhang, Y. -H.] Arizona State Univ, Ctr Photon Innovat, Tempe, AZ 85287 USA. [He, Z. -Y.; Liu, S.; Zhang, Y. -H.] Arizona State Univ, Sch Elect Comp & Energy Engn, Tempe, AZ 85287 USA. [Kadlec, E. A.; Olson, B.; Shaner, E. A.] Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Zuo, D (reprint author), Univ Illinois, Dept Elect & Comp Engn, 1406 W Green St, Urbana, IL 61801 USA. NR 6 TC 0 Z9 0 U1 2 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2160-9020 BN 978-1-55752-968-8 J9 CONF LASER ELECTR PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BE3EW UT WOS:000370627101485 ER PT S AU Mazumdar, A Spencer, S Salton, J Hobart, C Love, J Dullea, K Kuehl, M Blada, T Quigley, M Smith, J Bertrand, S Wu, TF Pratt, J Buerger, S AF Mazumdar, Anirban Spencer, Steven Salton, Jonathan Hobart, Clinton Love, Joshua Dullea, Kevin Kuehl, Michael Blada, Timothy Quigley, Morgan Smith, Jesper Bertrand, Sylvain Wu, Tingfan Pratt, Jerry Buerger, Stephen GP IEEE TI Using Parallel Stiffness to Achieve Improved Locomotive Efficiency with the Sandia STEPPR Robot SO 2015 IEEE INTERNATIONAL CONFERENCE ON ROBOTICS AND AUTOMATION (ICRA) SE IEEE International Conference on Robotics and Automation ICRA LA English DT Proceedings Paper CT IEEE International Conference on Robotics and Automation (ICRA) CY MAY 26-30, 2015 CL Seattle, WA SP IEEE ID PROSTHESIS; DESIGN AB In this paper we introduce STEPPR (Sandia Transmission-Efficient Prototype Promoting Research), a bipedal robot designed to explore efficient bipedal walking. The initial iteration of this robot achieves efficient motions through powerful electromagnetic actuators and highly back-drivable synthetic rope transmissions. We show how the addition of parallel elastic elements at select joints is predicted to provide substantial energetic benefits: reducing cost of transport by 30 to 50 percent. Two joints in particular, hip roll and ankle pitch, reduce dissipated power over three very different gait types: human walking, human-like robot walking, and crouched robot walking. Joint springs based on this analysis are tested and validated experimentally. Finally, this paper concludes with the design of two unique parallel spring mechanisms to be added to the current STEPPR robot in order to provide improved locomotive efficiency. C1 [Mazumdar, Anirban; Spencer, Steven; Salton, Jonathan; Hobart, Clinton; Love, Joshua; Dullea, Kevin; Kuehl, Michael; Blada, Timothy; Buerger, Stephen] Sandia Natl Labs, Intelligent Syst Robot & Cybernet, POB 5800, Albuquerque, NM 87185 USA. [Quigley, Morgan] Open Source Robot Fdn, Mountain View, CA USA. [Smith, Jesper; Bertrand, Sylvain; Wu, Tingfan; Pratt, Jerry] Inst Human & Machine Cognit, Biolnspired Robot Lab, Pensacola, FL 32502 USA. RP Mazumdar, A (reprint author), Sandia Natl Labs, Intelligent Syst Robot & Cybernet, POB 5800, Albuquerque, NM 87185 USA. EM amazumd@sandia.gov; morgan@osrfoundation.org; jpratt@ihmc.us NR 19 TC 0 Z9 0 U1 1 U2 3 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 USA SN 1050-4729 BN 978-1-4799-6923-4 J9 IEEE INT CONF ROBOT PY 2015 BP 835 EP 841 PG 7 WC Automation & Control Systems; Computer Science, Artificial Intelligence; Engineering, Electrical & Electronic; Robotics SC Automation & Control Systems; Computer Science; Engineering; Robotics GA BE3MR UT WOS:000370974900121 ER PT S AU Zhang, R Candra, SA Vetter, K Zakhor, A AF Zhang, Richard Candra, Stefan A. Vetter, Kai Zakhor, Avideh GP IEEE TI Sensor Fusion for Semantic Segmentation of Urban Scenes SO 2015 IEEE INTERNATIONAL CONFERENCE ON ROBOTICS AND AUTOMATION (ICRA) SE IEEE International Conference on Robotics and Automation ICRA LA English DT Proceedings Paper CT IEEE International Conference on Robotics and Automation (ICRA) CY MAY 26-30, 2015 CL Seattle, WA SP IEEE AB Semantic understanding of environments is an important problem in robotics in general and intelligent autonomous systems in particular. In this paper, we propose a semantic segmentation algorithm which effectively fuses information from images and 3D point clouds. The proposed method incorporates information from multiple scales in an intuitive and effective manner. A late-fusion architecture is proposed to maximally leverage the training data in each modality. Finally, a pairwise Conditional Random Field (CRF) is used as a post-processing step to enforce spatial consistency in the structured prediction. The proposed algorithm is evaluated on the publicly available KITTI dataset [1] [2], augmented with additional pixel and point-wise semantic labels for building, sky, road, vegetation, sidewalk, car, pedestrian, cyclist, sign/ pole, and fence regions. A per-pixel accuracy of 89.3% and average class accuracy of 65.4% is achieved, well above current state-of-the-art [3]. C1 [Zhang, Richard; Zakhor, Avideh] Univ Calif Berkeley, Dept Elect Engn & Comp Sci, Berkeley, CA 94720 USA. [Candra, Stefan A.] Univ Calif Berkeley, Dept Comp Sci, Berkeley, CA 94720 USA. [Vetter, Kai] Univ Calif Berkeley, Dept Nucl Engn, Berkeley, CA 94720 USA. [Vetter, Kai] Lawrence Berkeley Natl Lab, Div Nucl Sci, Berkeley, CA USA. RP Zhang, R (reprint author), Univ Calif Berkeley, Dept Elect Engn & Comp Sci, Berkeley, CA 94720 USA. EM rich.zhang@eecs.berkeley.edu; candrastefan@berkeley.edu; kvetter@lbl.gov; avz@eecs.berkeley.edu NR 30 TC 2 Z9 2 U1 2 U2 3 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 USA SN 1050-4729 BN 978-1-4799-6923-4 J9 IEEE INT CONF ROBOT PY 2015 BP 1850 EP 1857 PG 8 WC Automation & Control Systems; Computer Science, Artificial Intelligence; Engineering, Electrical & Electronic; Robotics SC Automation & Control Systems; Computer Science; Engineering; Robotics GA BE3MR UT WOS:000370974901124 ER PT S AU Sabelhaus, AP Bruce, J Caluwaerts, K Manovi, P Firoozi, RF Dobi, S Agogino, AM SunSpira, V AF Sabelhaus, Andrew P. Bruce, Jonathan Caluwaerts, Ken Manovi, Pavlo Firoozi, Roya Fallah Dobi, Sarah Agogino, Alice M. SunSpira, Vytas GP IEEE TI System Design and Locomotion of SUPERball, an Untethered Tensegrity Robot SO 2015 IEEE INTERNATIONAL CONFERENCE ON ROBOTICS AND AUTOMATION (ICRA) SE IEEE International Conference on Robotics and Automation ICRA LA English DT Proceedings Paper CT IEEE International Conference on Robotics and Automation (ICRA) CY MAY 26-30, 2015 CL Seattle, WA SP IEEE AB The Spherical Underactuated Planetary Exploration Robot ball (SUPERball) is an ongoing project within NASA Ames Research Center's Intelligent Robotics Group and the Dynamic Tensegrity Robotics Lab (DTRL). The current SUPERball is the first full prototype of this tensegrity robot platform, eventually destined for space exploration missions. This work, building on prior published discussions of individual components, presents the fully-constructed robot. Various design improvements are discussed, as well as testing results of the sensors and actuators that illustrate system performance. Basic low-level motor position controls are implemented and validated against sensor data, which show SUPERball to be uniquely suited for highly dynamic state trajectory tracking. Finally, SUPERball is shown in a simple example of locomotion. This implementation of a basic motion primitive shows SUPERball in untethered control. C1 [Sabelhaus, Andrew P.; Bruce, Jonathan; Caluwaerts, Ken; Manovi, Pavlo; Dobi, Sarah; SunSpira, Vytas] NASA, Ames Intelligent Robot Grp, Moffett Field, CA 94035 USA. [Sabelhaus, Andrew P.; Bruce, Jonathan; Caluwaerts, Ken; Manovi, Pavlo; Dobi, Sarah; SunSpira, Vytas] NASA, Dynam Tensegr Robot Lab, Moffett Field, CA 94035 USA. [Sabelhaus, Andrew P.; Firoozi, Roya Fallah; Dobi, Sarah; Agogino, Alice M.] Univ Calif Berkeley, Dept Mech Engn, Berkeley, CA 94720 USA. [Bruce, Jonathan; Manovi, Pavlo] Univ Calif Santa Cruz, Dept Comp Engn, Santa Cruz, CA 95064 USA. [Caluwaerts, Ken] Oak Ridge Associated Univ, Oak Ridge, TN 37830 USA. [Caluwaerts, Ken] Univ Ghent, Elect & Informat Syst Dept, B-9000 Ghent, Belgium. [SunSpira, Vytas] SGT Inc, Greenbelt, MD 20770 USA. RP Sabelhaus, AP (reprint author), NASA, Ames Intelligent Robot Grp, Moffett Field, CA 94035 USA. EM apsabelhaus@berkeley.edu; jbruce@soe.ucsc.edu; ken.caluwaerts@nasa.gov; pavlomanovi@soe.ucsc.edu; royafiroozi@berkeley.edu; sarahdobi@berkeley.edu; agogino@berkeley.edu; vytas.sunspiral@nasa.gov NR 23 TC 5 Z9 5 U1 1 U2 4 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 USA SN 1050-4729 BN 978-1-4799-6923-4 J9 IEEE INT CONF ROBOT PY 2015 BP 2867 EP 2873 PG 7 WC Automation & Control Systems; Computer Science, Artificial Intelligence; Engineering, Electrical & Electronic; Robotics SC Automation & Control Systems; Computer Science; Engineering; Robotics GA BE3MR UT WOS:000370974902130 ER PT S AU Faust, A Malone, N Tapia, L AF Faust, Aleksandra Malone, Nick Tapia, Lydia GP IEEE TI Preference-balancing Motion Planning under Stochastic Disturbances SO 2015 IEEE INTERNATIONAL CONFERENCE ON ROBOTICS AND AUTOMATION (ICRA) SE IEEE International Conference on Robotics and Automation ICRA LA English DT Proceedings Paper CT IEEE International Conference on Robotics and Automation (ICRA) CY MAY 26-30, 2015 CL Seattle, WA SP IEEE AB Physical stochastic disturbances, such as wind, often affect the motion of robots that perform complex tasks in real-world conditions. These disturbances pose a control challenge because resulting drift induces uncertainty and changes in the robot's speed and direction. This paper presents an online control policy based on supervised machine learning, Least Squares Axial Sum Policy Approximation (LSAPA), that generates trajectories for robotic preference-balancing tasks under stochastic disturbances. The task is learned offline with reinforcement learning, assuming no disturbances, and then trajectories are planned online in the presence of disturbances using the current observed information. We model the robot as a stochastic control-affine system with unknown dynamics impacted by a Gaussian process, and the task as a continuous Markov Decision Process. Replacing a traditional greedy policy, LSAPA works for high-dimensional control-affine systems impacted by stochastic disturbances and is linear in the input dimensionality. We verify the method for Swing-free Aerial Cargo Delivery and Rendezvous tasks. Results show that LSAPA selects an input an order of magnitude faster than comparative methods, rejecting a range of stochastic disturbances. Further, experiments on a quadrotor demonstrate that LSAPA trajectories that are suitable for physical systems. C1 [Faust, Aleksandra; Malone, Nick; Tapia, Lydia] Univ New Mexico, Comp Sci Dept, Albuquerque, NM 87131 USA. [Faust, Aleksandra] Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Faust, A (reprint author), Univ New Mexico, Comp Sci Dept, Albuquerque, NM 87131 USA. EM afaust@cs.unm.edu; nmalone@cs.unm.edu; tapia@cs.unm.edu NR 31 TC 1 Z9 1 U1 0 U2 2 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 USA SN 1050-4729 BN 978-1-4799-6923-4 J9 IEEE INT CONF ROBOT PY 2015 BP 3555 EP 3562 PG 8 WC Automation & Control Systems; Computer Science, Artificial Intelligence; Engineering, Electrical & Electronic; Robotics SC Automation & Control Systems; Computer Science; Engineering; Robotics GA BE3MR UT WOS:000370974903082 ER PT S AU Borgstadt, JA Zinn, MR Ferrier, NJ AF Borgstadt, Justin A. Zinn, Michael R. Ferrier, Nicola J. GP IEEE TI Multi-Modal Localization Algorithm for Catheter Interventions SO 2015 IEEE INTERNATIONAL CONFERENCE ON ROBOTICS AND AUTOMATION (ICRA) SE IEEE International Conference on Robotics and Automation ICRA LA English DT Proceedings Paper CT IEEE International Conference on Robotics and Automation (ICRA) CY MAY 26-30, 2015 CL Seattle, WA SP IEEE ID CONTINUUM ROBOTS; MANIPULATORS; VISION AB Localization of steerable catheters in minimally invasive surgery is critical with respect to patient safety, surgeon manipulation, and procedural efficacy. While there are many potential benefits to patients including shorter recovery times, less tissue trauma, and lower infection rates than traditional surgeries, localization of surgical tools is still an area of much research. Current technology offers several sensory modalities. However, each system has drawbacks which do not provide a clear best practice. This research focuses on incorporating redundant commonplace surgical sensing technologies to reduce the likelihood of errors, failures, or inherent sensor characteristics causing harm to the patient and/or surgeon while providing accurate localization. Dual particle filters are implemented using both a fluoroscopic-like stereo imaging system and an electromagnetic pose sensor for measurement updates in a prototype catheter testbed. A previously developed catheter model is modified to increase accuracy in the particle filter outputs which are combined using a weighted average based on each filter's particle statistics. Experimental results implementing the combined particle filter multi-modality algorithm in feedback control validates the algorithms ability to provide accurate localization in a surgical setting while overcoming sensor limitations and possible failure modes. C1 [Borgstadt, Justin A.; Zinn, Michael R.] Univ Wisconsin, Dept Mech Engn, Madison, WI 53706 USA. [Ferrier, Nicola J.] Argonne Natl Lab, Div Math & Comp Sci, Argonne, IL 60439 USA. RP Borgstadt, JA (reprint author), Univ Wisconsin, Dept Mech Engn, Madison, WI 53706 USA. EM jaborgstadt@wisc.edu; mzinn@wisc.edu; nferrier@anl.gov NR 24 TC 3 Z9 3 U1 2 U2 3 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 USA SN 1050-4729 BN 978-1-4799-6923-4 J9 IEEE INT CONF ROBOT PY 2015 BP 5350 EP 5357 PG 8 WC Automation & Control Systems; Computer Science, Artificial Intelligence; Engineering, Electrical & Electronic; Robotics SC Automation & Control Systems; Computer Science; Engineering; Robotics GA BE3MR UT WOS:000370974905043 ER PT S AU Tang, F McMahan, RP Ragan, ED Allen, TT AF Tang, Fei McMahan, Ryan P. Ragan, Eric D. Allen, Tandra T. BE Hollerer, T Interrante, V Lecuyer, A Swan, JE TI A Modified Tactile Brush Algorithm for Complex Touch Gestures SO 2015 IEEE VIRTUAL REALITY CONFERENCE (VR) SE Proceedings of the IEEE Virtual Reality Annual International Symposium LA English DT Proceedings Paper CT 22nd IEEE Virtual Reality Conference (VR) CY MAR 23-27, 2015 CL Arles, FRANCE SP IEEE, IEEE Comp Soc, IEEE Comp Soc Visualizat & Graph Tech Comm, IEEE France DE Touch gestures; tactile brush; apparent tactile motion; H.5.2 [Information Interfaces and Presentation]: User Interfaces-Haptic I/O AB Several researchers have investigated phantom tactile sensation (i.e., the perception of a nonexistent actuator between two real actuators) and apparent tactile motion (i.e., the perception of a moving actuator due to time delays between onsets of multiple actuations). Prior work has focused primarily on determining appropriate Durations of Stimulation (DOS) and Stimulus Onset Asynchronies (SOA) for simple touch gestures, such as a single finger stroke. To expand upon this knowledge, we investigated complex touch gestures involving multiple, simultaneous points of contact, such as a whole hand touching the arm. To implement complex touch gestures, we modified the Tactile Brush algorithm to support rectangular areas of tactile stimulation. C1 [Tang, Fei; McMahan, Ryan P.; Allen, Tandra T.] Univ Texas Dallas, Richardson, TX 75083 USA. [Ragan, Eric D.] Oak Ridge Natl Lab, Oak Ridge, TN USA. RP Tang, F (reprint author), Univ Texas Dallas, Richardson, TX 75083 USA. EM Fei.Tang@utdallas.edu; rymcmaha@utdallas.edu; raganed@ornl.goy; Tandra.Allen@utdallas.edu NR 9 TC 1 Z9 1 U1 0 U2 0 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 USA SN 1087-8270 BN 978-1-4799-1727-3 J9 P IEEE VIRT REAL ANN PY 2015 BP 295 EP 296 PG 2 WC Computer Science, Cybernetics SC Computer Science GA BE3ZC UT WOS:000371409700095 ER PT S AU Chow, WW Liu, AY Gossard, AC Bowers, JE Jahnke, F AF Chow, W. W. Liu, A. Y. Gossard, A. C. Bowers, J. E. Jahnke, F. GP IEEE TI Gain-current relationships in quantum-dot and quantum-well lasers: theory and experiment SO 2015 PHOTONICS CONFERENCE (IPC) SE IEEE Photonics Conference LA English DT Proceedings Paper CT IEEE Photonics Conference CY OCT 04-08, 2015 CL Reston, VA SP IEEE AB The gain-current relationships for quantum-dot and quantum-well lasers are compared experimentally and theoretically. Rigorous treatment of collision effects using quantum-kinetic equations improves precision in determination of extrinsic parameters and prediction of performance. C1 [Chow, W. W.] Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. [Liu, A. Y.; Gossard, A. C.; Bowers, J. E.] Univ Calif Santa Barbara, Dept Mat, Santa Barbara, CA 93106 USA. [Gossard, A. C.; Bowers, J. E.] Univ Calif Santa Barbara, Dept Elect & Comp Engn, Santa Barbara, CA 93106 USA. [Jahnke, F.] Univ Bremen, Inst Theoret Phys, D-28334 Bremen, Germany. RP Chow, WW (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. EM wwchow@sandia.gov; ayliu01@engineering.ucsb.edu; acgossard@gmail.com; bowers@ece.ucsb.edu; jahnke@itp.uni-bremen.de NR 1 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2374-0140 BN 978-1-4799-7465-8 J9 IEEE PHOTON CONF PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics SC Engineering; Optics GA BE3MN UT WOS:000370968200267 ER PT S AU Khanal, S Zhao, L Reno, JL Kumar, S AF Khanal, Sudeep Zhao, Le Reno, John L. Kumar, Sushil GP IEEE TI High-temperature operation of bidirectional terahertz quantum cascade lasers emitting from 3.1-3.7 THz SO 2015 PHOTONICS CONFERENCE (IPC) SE IEEE Photonics Conference LA English DT Proceedings Paper CT IEEE Photonics Conference CY OCT 04-08, 2015 CL Reston, VA SP IEEE AB A broadband bidirectional terahertz quantum-cascade laser operating up to 147K and emitting in the frequency range of 3.1-3.7THz is demonstrated. A three-well GaAs/AlGaAs design with 10%Al barriers is shown to be optimum for bidirectional lasing. C1 [Khanal, Sudeep; Zhao, Le; Kumar, Sushil] Lehigh Univ, Dept Elect Engn & Comp Sci, Bethlehem, PA 18015 USA. [Reno, John L.] Sandia Natl Labs, Ctr Integrated Nanotechnol, Albuquerque, NM 87185 USA. RP Khanal, S (reprint author), Lehigh Univ, Dept Elect Engn & Comp Sci, Bethlehem, PA 18015 USA. EM suk311@lehigh.edu NR 8 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2374-0140 BN 978-1-4799-7465-8 J9 IEEE PHOTON CONF PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics SC Engineering; Optics GA BE3MN UT WOS:000370968200255 ER PT S AU Kuznetsov, I Filevich, J Dong, F Woolston, M Chao, WL Anderson, EH Bernstein, ER Crick, DC Rocca, JJ Menoni, CS AF Kuznetsov, Ilya Filevich, Jorge Dong, Feng Woolston, Mark Chao, Weilun Anderson, Erik H. Bernstein, Elliot R. Crick, Dean C. Rocca, Jorge J. Menoni, Carmen S. GP IEEE TI Ultrasensivite Three Dimensional Nanoscale Chemical Imaging SO 2015 PHOTONICS CONFERENCE (IPC) SE IEEE Photonics Conference LA English DT Proceedings Paper CT IEEE Photonics Conference CY OCT 04-08, 2015 CL Reston, VA SP IEEE ID X-RAY LASER AB We demonstrate nano-scale 3-dimensional chemical imaging by extreme ultraviolet laser with 75 nm lateral, 20 nm depth resolution, and 0.01 aM sensitivity. 3D composition images of a single micro-organisms were obtained. C1 [Kuznetsov, Ilya; Filevich, Jorge; Dong, Feng; Woolston, Mark; Chao, Weilun; Anderson, Erik H.; Bernstein, Elliot R.; Rocca, Jorge J.; Menoni, Carmen S.] Colorado State Univ, Ctr Extreme Ultraviolet Sci & Technol, Ft Collins, CO 80523 USA. [Kuznetsov, Ilya; Filevich, Jorge; Woolston, Mark; Rocca, Jorge J.; Menoni, Carmen S.] Colorado State Univ, Dept Elect & Comp Engn, Ft Collins, CO 80523 USA. [Dong, Feng; Bernstein, Elliot R.; Menoni, Carmen S.] Colorado State Univ, Dept Chem, Ft Collins, CO 80523 USA. [Chao, Weilun; Anderson, Erik H.] Lawrence Berkeley Lab, Ctr Xray Opt, Berkeley, CA USA. [Crick, Dean C.] Colorado State Univ, Dept Microbiol Immunol & Pathol, Ft Collins, CO 80523 USA. [Rocca, Jorge J.] Colorado State Univ, Dept Phys, Ft Collins, CO 80523 USA. RP Menoni, CS (reprint author), Colorado State Univ, Ctr Extreme Ultraviolet Sci & Technol, Ft Collins, CO 80523 USA. EM Carmen.Menoni@colostate.edu NR 3 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2374-0140 BN 978-1-4799-7465-8 J9 IEEE PHOTON CONF PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics SC Engineering; Optics GA BE3MN UT WOS:000370968200203 ER PT S AU Leemans, WP Gonsalves, AJ Nakamura, K Mao, HS Toth, C Daniels, J Mittelberger, D Schroeder, CB Benedetti, C Bulanov, SS Vay, JL Geddes, CGR Esarey, EH AF Leemans, W. P. Gonsalves, A. J. Nakamura, K. Mao, H. -S. Toth, C. Daniels, J. Mittelberger, D. Schroeder, C. B. Benedetti, C. Bulanov, S. S. Vay, J. -L. Geddes, C. G. R. Esarey, E. H. GP IEEE TI Multi-GeV experiments with the Petawatt class BELLA laser SO 2015 PHOTONICS CONFERENCE (IPC) SE IEEE Photonics Conference LA English DT Proceedings Paper CT IEEE Photonics Conference CY OCT 04-08, 2015 CL Reston, VA SP IEEE AB Acceleration of electrons using intense laser pulses that excite multi-gigavolt fields in plasmas will be described and the path forward to practical accelerators. Experiments with the PetaWatt 1 Hz BELLA-laser at LBNL will be discussed. C1 [Leemans, W. P.; Gonsalves, A. J.; Nakamura, K.; Mao, H. -S.; Toth, C.; Daniels, J.] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, 1 Cyclotron Rd, Berkeley, CA 94720 USA. [Leemans, W. P.] Univ Calif Berkeley, Berkeley, CA 94720 USA. [Daniels, J.] Tech Univ Eindhoven, NL-5600 MB Eindhoven, Netherlands. RP Leemans, WP (reprint author), Univ Calif Berkeley, Lawrence Berkeley Natl Lab, 1 Cyclotron Rd, Berkeley, CA 94720 USA. EM wpleemans@lbl.gov NR 7 TC 0 Z9 0 U1 1 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2374-0140 BN 978-1-4799-7465-8 J9 IEEE PHOTON CONF PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics SC Engineering; Optics GA BE3MN UT WOS:000370968200027 ER PT S AU Wong, ZJ Feng, L Ma, RM Wang, Y Zhang, X AF Wong, Zi Jing Feng, Liang Ma, Ren-Min Wang, Yuan Zhang, Xiang GP IEEE TI Parity-time Optical Metamaterials SO 2015 PHOTONICS CONFERENCE (IPC) SE IEEE Photonics Conference LA English DT Proceedings Paper CT IEEE Photonics Conference CY OCT 04-08, 2015 CL Reston, VA SP IEEE ID SYMMETRY AB Exploration of the interplay between gain and loss in optical meta materials can lead to novel device functionalities. Here we demonstrate a single-mode laser with unique cavity mode manipulation capability based on thresholdless parity-time symmetry breaking. C1 [Wong, Zi Jing; Feng, Liang; Ma, Ren-Min; Wang, Yuan; Zhang, Xiang] Univ Calif Berkeley, NSF Nanoscale Sci & Engn Ctr, Berkeley, CA 94720 USA. [Wang, Yuan; Zhang, Xiang] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA. RP Wong, ZJ (reprint author), Univ Calif Berkeley, NSF Nanoscale Sci & Engn Ctr, Berkeley, CA 94720 USA. EM zijing@berkeley.edu NR 5 TC 0 Z9 0 U1 1 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2374-0140 BN 978-1-4799-7465-8 J9 IEEE PHOTON CONF PY 2015 PG 2 WC Engineering, Electrical & Electronic; Optics SC Engineering; Optics GA BE3MN UT WOS:000370968200235 ER PT S AU Erdman, WL Keller, J Grider, D VanBrunt, E AF Erdman, William L. Keller, Jonathan Grider, David VanBrunt, Edward GP IEEE TI A 2.3-MW Medium-Voltage, Three-Level Wind Energy Inverter Applying a Unique Bus Structure and 4.5-kV Si/SiC Hybrid Isolated Power Modules SO 2015 THIRTIETH ANNUAL IEEE APPLIED POWER ELECTRONICS CONFERENCE AND EXPOSITION (APEC 2015) SE Annual IEEE Applied Power Electronics Conference and Exposition (APEC) LA English DT Proceedings Paper CT 30th Annual IEEE Applied Power Electronics Conference and Exposition (APEC) CY MAR 15-19, 2015 CL Charlotte, NC SP IEEE, Power Sources Manufacturers Assoc, IEEE Power Elect Soc, IEEE Ind Applicat Soc DE Wind turbine; wind energy; medium voltage; three level inverter; silicon carbide; SiC; efficiency; barrier diode; laminated bus; parasitic inductances; logarithmic decrement method AB A high-efficiency, 2.3-MW, medium-voltage, three level inverter utilizing 4.5-kV Si/SiC (silicon carbide) hybrid modules for wind energy applications is discussed. The inverter addresses recent trends in siting the inverter within the base of multimegawatt turbine towers. A simplified split, three-layer laminated bus structure that maintains low parasitic inductances is introduced along with a low-voltage, high-current test method for determining these inductances. Feed-thru bushings, edge fill methods, and other design features of the laminated bus structure provide voltage isolation that is consistent with the 10.4-kV module isolation levels. Inverter efficiency improvement is a result of the (essential) elimination of the reverse recovery charge present in 4.5-kV Si PIN diodes, which can produce a significant reduction in diode turn-off losses as well as insulated-gate bipolar transistor (IGBT) turn-on losses. The hybrid modules are supplied in industry-standard 140 mm x 130 mm and 190 mm x 130 mm packages to demonstrate direct module substitution into existing inverter designs. A focus on laminated bus/capacitor-bank/module subassembly level switching performance is presented. C1 [Erdman, William L.] Cinch LLC, Moraga, CA USA. [Keller, Jonathan] Natl Wind Technol Ctr, Golden, CO USA. [Grider, David; VanBrunt, Edward] CREE Inc, Raleigh, NC USA. RP Erdman, WL (reprint author), Cinch LLC, Moraga, CA USA. EM jonathan.keller@nrel.gov; david_grider@cree.com NR 17 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1048-2334 BN 978-1-4799-6735-3 J9 APPL POWER ELECT CO PY 2015 BP 1282 EP 1289 PG 8 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE2TZ UT WOS:000370076901062 ER PT S AU Perlenfein, S Ropp, M Neely, J Gonzalez, S Rashkin, L AF Perlenfein, Scott Ropp, Michael Neely, Jason Gonzalez, Sigifredo Rashkin, Lee GP IEEE TI Subharmonic Power Line Carrier (PLC) Based Island Detection SO 2015 THIRTIETH ANNUAL IEEE APPLIED POWER ELECTRONICS CONFERENCE AND EXPOSITION (APEC 2015) SE Annual IEEE Applied Power Electronics Conference and Exposition (APEC) LA English DT Proceedings Paper CT 30th Annual IEEE Applied Power Electronics Conference and Exposition (APEC) CY MAR 15-19, 2015 CL Charlotte, NC SP IEEE, Power Sources Manufacturers Assoc, IEEE Power Elect Soc, IEEE Ind Applicat Soc DE anti-islanding; power line carrier; distributed generation; photovoltaics; advanced inverters ID GENERATION AB The anticipated high penetration of distributed photovoltaic (PV) energy sources is expected to lead to significant changes in utility interconnection requirements for PV systems. These changes will include provisions for voltage and frequency regulation capability, as well as better voltage and frequency ride through requirements. For distributed energy resources (DER), in particular PV, to provide grid support, it must participate in frequency and voltage regulation. Frequency and voltage ride through allows inverters to remain connected to ensure robust recovery in the event of voltage and frequency disturbance. Implementing these advanced capabilities is essential to mitigating the negative impacts of high penetration PV, but their integration into a typical distribution system presents significant technical challenges, one of which is the increased risk of unintentional islanding. In this paper, an island detection method is presented that relies on a continuous subharmonic signal, a power line carrier permissive (PLCP), that is injected at the transmission level or at the substation and detected by any type of DERs in any combination. Absence of the signal indicates loss of utility and possible island condition. Laboratory and simulation experiments were done to investigate feasibility of the method. The PLC system discussed herein is novel in that it utilizes a power electronics based series voltage injection method. Advantages include the ability to use a smaller and less expensive transformer and enhanced flexibility in the amplitude, waveform and frequency of the injected signal. C1 [Perlenfein, Scott; Ropp, Michael] Northern Plains Power Technol, Brookings, SD 57006 USA. [Neely, Jason; Gonzalez, Sigifredo; Rashkin, Lee] Sandia Natl Labs, Albuquerque, NM 87123 USA. RP Perlenfein, S (reprint author), Northern Plains Power Technol, Brookings, SD 57006 USA. EM scott.perlenfein@northernplainspower.com; michael.ropp@northernplainspower.com; jneely@sandia.gov; sgonza@sandia.gov; lrashki@sandia.gov NR 15 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1048-2334 BN 978-1-4799-6735-3 J9 APPL POWER ELECT CO PY 2015 BP 2230 EP 2236 PG 7 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE2TZ UT WOS:000370076902059 ER PT S AU D'Oca, S Corgnati, S Hong, TZ AF D'Oca, Simona Corgnati, Stefano Hong, Tianzhen BE Perino, M TI Data Mining of Occupant Behavior in Office Buildings SO 6TH INTERNATIONAL BUILDING PHYSICS CONFERENCE (IBPC 2015) SE Energy Procedia LA English DT Proceedings Paper CT 6th International Building Physics Conference (IBPC) CY JUN 14-17, 2015 CL Torino, ITALY SP ATI Piemonte, PolitecnicoTorino, Dept Energy DE data mining; occupant behavior; office building; window operation; occupancy patterns AB Literature studies confirm occupant behavior is setting the direction for contemporary researches aiming to bridge the gap between predicted and actual energy performance of sustainable buildings. Using the Knowledge Discovery in Database (KDD) methodology, two data mining learning processes are proposed to extrapolate office occupancy and windows' operation behavioral patterns from a two-years data set of 16 offices in a natural ventilated office building. Clustering procedures, decision tree models and rule induction algorithms are employed to obtain association rules segmenting the building occupants into working user profiles, which can be further implemented as occupant behavior advanced-inputs into building energy simulations. (C) 2015 The Authors. Published by Elsevier Ltd. C1 [D'Oca, Simona; Corgnati, Stefano] Politecn Torino, DENERG, Turin, Italy. [D'Oca, Simona; Hong, Tianzhen] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. RP Corgnati, S (reprint author), Politecn Torino, DENERG, Turin, Italy. EM stefano.corgnati@polito.it NR 17 TC 0 Z9 0 U1 1 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA SARA BURGERHARTSTRAAT 25, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1876-6102 J9 ENRGY PROCED PY 2015 VL 78 BP 585 EP 590 DI 10.1016/j.egypro.2015.11.022 PG 6 WC Construction & Building Technology; Energy & Fuels; Physics, Applied SC Construction & Building Technology; Energy & Fuels; Physics GA BE3LF UT WOS:000370934400098 ER PT S AU Andersen, S Less, B Walker, I AF Andersen, Soren Less, Brennan Walker, Iain BE Perino, M TI Indoor Environmental Patterns In Nine California Energy Retrofitted Residences SO 6TH INTERNATIONAL BUILDING PHYSICS CONFERENCE (IBPC 2015) SE Energy Procedia LA English DT Proceedings Paper CT 6th International Building Physics Conference (IBPC) CY JUN 14-17, 2015 CL Torino, ITALY SP ATI Piemonte, PolitecnicoTorino, Dept Energy DE Occupant behavior; Indoor environmentall patterns AB As part of a study of energy retrofits in nine California buildings indoor measurements of temperature and relative humidity were made between 2010 and 2012. The aim of this paper was to compare the temperature and relative humidity measurements in relation to recommendations for a healthy, comfortable and low energy consuming indoor environment. Energy conserving behavior during the heating season was detected in all buildings. The paper further aimed to find patterns in the measurement to determine if an energy retrofit affects the occupants' behavior and indoor environmental regulation strategies. No general pattern could be defined. (C) 2015 The Authors. Published by Elsevier Ltd. C1 [Andersen, Soren] Tech Univ Denmark, Nils Kopels Alle 402, DK-2800 Lyngby, Denmark. [Less, Brennan; Walker, Iain] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. RP Andersen, S (reprint author), Tech Univ Denmark, Nils Kopels Alle 402, DK-2800 Lyngby, Denmark. NR 13 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA SARA BURGERHARTSTRAAT 25, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1876-6102 J9 ENRGY PROCED PY 2015 VL 78 BP 627 EP 632 DI 10.1016/j.egypro.2015.11.789 PG 6 WC Construction & Building Technology; Energy & Fuels; Physics, Applied SC Construction & Building Technology; Energy & Fuels; Physics GA BE3LF UT WOS:000370934400105 ER PT S AU Itagaki, N Zhao, PW Meng, J Matsuno, H Suhara, T AF Itagaki, N. Zhao, P. W. Meng, J. Matsuno, H. Suhara, T. BE Lipoglavsek, M Milin, M Niksic, T Szilner, S Vretenar, D TI Exotic structure in light neutron-rich nuclei SO NUCLEAR STRUCTURE AND DYNAMICS '15 SE AIP Conference Proceedings LA English DT Proceedings Paper CT 3rd International Conference on Nuclear Structure and Dynamics CY JUN 14-19, 2015 CL Portoroz, SLOVENIA SP Jozef Stefan Inst, Univ Zagreb, Phys Dept, Ruder Boskov Inst AB In this presentation I discussed two subjects. One is the persistence of threefold symmetry in the ground state of C-12. Recently D-3h symmetry has been established in C-12, which reflects the geometric symmetry of the three a particles. Although the spin-orbit interaction plays a significant role and this interaction breaks the a clusters, we show that threefold symmetry of C-12 is still there. We use AQCM approach and discuss that inclusion of spin-orbit interaction, which is absent in the conventional microscopic a cluster models, is possible keeping the threefold symmetry. The second subject is the appearance of rod shape in C isotopes, which has been investigated in the framework of the cranking covariant density functional theory. The relationship between the stability of such states and the spin and isospin degrees of freedom is discussed; adding valence neutrons and rotating the system. These two effects stabilize the rod shape, and in addition, their coherent effect has been found; the sigma-orbits (parallel to the symmetry axis) of the valence neutrons, which enhances the rod shape, is lowered by the rotation of the system, and this sigma-orbit pulls down the single particle energies of protons with linear configuration owing to the proton-neutron interaction effect. C1 [Itagaki, N.] Kyoto Univ, Yukawa Inst Theoret Phys, Kyoto 6068502, Japan. [Zhao, P. W.] Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA. [Meng, J.] Peking Univ, Sch Phys, State Key Lab Nucl Phys & Technol, Beijing 100871, Peoples R China. [Matsuno, H.] Kyoto Univ, Dept Phys, Kyoto 6068502, Japan. [Suhara, T.] Matsue Coll Technol, Matsue, Shimane 6908518, Japan. RP Itagaki, N (reprint author), Kyoto Univ, Yukawa Inst Theoret Phys, Kyoto 6068502, Japan. EM itagaki@yukawa.kyoto-u.ac.jp RI Zhao, Pengwei/F-9107-2010 OI Zhao, Pengwei/0000-0001-8243-2381 NR 10 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0094-243X BN 978-0-7354-1328-3 J9 AIP CONF PROC PY 2015 VL 1681 AR 020006 DI 10.1063/1.4932241 PG 6 WC Physics, Applied; Physics, Nuclear SC Physics GA BE3WL UT WOS:000371322600006 ER PT S AU Jones, KL Ahn, S Allmond, JM Ayres, A Bardayan, DW Baugher, T Bazin, D Beene, JR Berryman, JS Bey, A Bingham, C Burcher, S Cartegni, L Cerizza, G Chae, KY Cizewski, JA Gade, A Galindo-Uribarri, A Garcia-Ruiz, RF Grzywacz, R Howard, ME Kozub, RL Liang, JF Manning, B Matos, M McDaniel, S Miller, D Nesaraja, CD O'Malley, PD Padgett, S Padilla-Rodal, E Pain, SD Pittman, ST Radford, DC Ratkiewicz, A Schmitt, KT Shore, A Smith, MS Stracener, DW Stroberg, SR Tostevin, J Varner, RL Weisshaar, D Wimmer, K Winkler, R AF Jones, K. L. Ahn, S. Allmond, J. M. Ayres, A. Bardayan, D. W. Baugher, T. Bazin, D. Beene, J. R. Berryman, J. S. Bey, A. Bingham, C. Burcher, S. Cartegni, L. Cerizza, G. Chae, K. Y. Cizewski, J. A. Gade, A. Galindo-Uribarri, A. Garcia-Ruiz, R. F. Grzywacz, R. Howard, M. E. Kozub, R. L. Liang, J. F. Manning, B. Matos, M. McDaniel, S. Miller, D. Nesaraja, C. D. O'Malley, P. D. Padgett, S. Padilla-Rodal, E. Pain, S. D. Pittman, S. T. Radford, D. C. Ratkiewicz, A. Schmitt, K. T. Shore, A. Smith, M. S. Stracener, D. W. Stroberg, S. R. Tostevin, J. Varner, R. L. Weisshaar, D. Wimmer, K. Winkler, R. BE Lipoglavsek, M Milin, M Niksic, T Szilner, S Vretenar, D TI Direct Reaction Experimental Studies with Beams of Radioactive Tin Ions SO NUCLEAR STRUCTURE AND DYNAMICS '15 SE AIP Conference Proceedings LA English DT Proceedings Paper CT 3rd International Conference on Nuclear Structure and Dynamics CY JUN 14-19, 2015 CL Portoroz, SLOVENIA SP Jozef Stefan Inst, Univ Zagreb, Phys Dept, Ruder Boskov Inst ID EXOTIC NUCLEI; GAMMASPHERE; ARRAY AB The tin chain of isotopes provides a unique region in which to investigate the evolution of single-particle structure, spreading from N = 50 at Sn-100, through 10 stable isotopes and the N = 82 shell closure at Sn-132 out into the r-process path. Direct reactions performed on radioactive ion beams are sensitive spectroscopic tools for studying exotic nuclei. Here we present one experiment knocking out neutrons from tin isotopes that are already neutron deficient and two reactions that add a neutron to neutron-rich Sn-130. Both techniques rely on selective particle identification and the measurement of gamma rays in coincidence with charged ions. We present the goals of the two experiments and the particle identification for the channels of interest. The final results will be presented in future publications. C1 [Jones, K. L.; Ahn, S.; Ayres, A.; Bey, A.; Bingham, C.; Burcher, S.; Cartegni, L.; Cerizza, G.; Grzywacz, R.; Padgett, S.; Padilla-Rodal, E.] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA. [Ahn, S.; Baugher, T.; Bazin, D.; Berryman, J. S.; Gade, A.; McDaniel, S.; Miller, D.; Ratkiewicz, A.; Shore, A.; Stroberg, S. R.; Weisshaar, D.; Wimmer, K.; Winkler, R.] Michigan State Univ, Natl Superconducting Cyclotron Lab, E Lansing, MI 48824 USA. [Ahn, S.; Baugher, T.; Bazin, D.; Berryman, J. S.; Gade, A.; McDaniel, S.; Miller, D.; Ratkiewicz, A.; Shore, A.; Stroberg, S. R.; Weisshaar, D.; Wimmer, K.; Winkler, R.] Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA. [Allmond, J. M.; Bardayan, D. W.; Beene, J. R.; Bingham, C.; Chae, K. Y.; Galindo-Uribarri, A.; Grzywacz, R.; Liang, J. F.; Nesaraja, C. D.; Pain, S. D.; Pittman, S. T.; Radford, D. C.; Schmitt, K. T.; Smith, M. S.; Stracener, D. W.; Varner, R. L.] Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA. [Bardayan, D. W.; O'Malley, P. D.] Univ Notre Dame, Dept Phys, Notre Dame, IN 46556 USA. [Baugher, T.; Cizewski, J. A.; Howard, M. E.; Manning, B.; O'Malley, P. D.; Ratkiewicz, A.] Rutgers State Univ, Dept Phys & Astron, New Brunswick, NJ 08903 USA. [Chae, K. Y.] Sungkyunkwan Univ, Dept Phys, Suwon 440746, South Korea. [Garcia-Ruiz, R. F.] Katholieke Univ Leuven, Inst Kernen Stralingsfys, B-3001 Leuven, Belgium. [Kozub, R. L.] Tennessee Technol Univ, Dept Phys, Cookeville, TN 38505 USA. [Matos, M.; Pittman, S. T.] Louisiana State Univ, Dept Phys & Astron, Baton Rouge, LA 70803 USA. [Matos, M.] IAEA, Div Phys & Chem Sci, A-1400 Vienna, Austria. [Miller, D.] TRIUMF, Vancouver, BC V6T 2A3C, Canada. [Padgett, S.] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. [Padilla-Rodal, E.] Univ Nacl Autonoma Mexico, Inst Ciencias Nucl, Mexico City 04510, DF, Mexico. [Tostevin, J.] Univ Surrey, Dept Phys, Guildford GU2 7XH, Surrey, England. [Wimmer, K.] Cent Michigan Univ, Dept Phys, Mt Pleasant, MI 48858 USA. RP Jones, KL (reprint author), Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA. EM kgrzywac@utk.edu RI Pain, Steven/E-1188-2011; OI Pain, Steven/0000-0003-3081-688X; Allmond, James Mitchell/0000-0001-6533-8721 NR 25 TC 0 Z9 0 U1 1 U2 2 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0094-243X BN 978-0-7354-1328-3 J9 AIP CONF PROC PY 2015 VL 1681 AR 060010 DI 10.1063/1.4932296 PG 7 WC Physics, Applied; Physics, Nuclear SC Physics GA BE3WL UT WOS:000371322600061 ER PT S AU Moretto, LG Larsen, AC Guttormsen, M Siem, S AF Moretto, Luciano G. Larsen, A. C. Guttormsen, M. Siem, S. BE Lipoglavsek, M Milin, M Niksic, T Szilner, S Vretenar, D TI The Hagedorn Spectrum, Nuclear Level Densities And First Order Phase Transitions SO NUCLEAR STRUCTURE AND DYNAMICS '15 SE AIP Conference Proceedings LA English DT Proceedings Paper CT 3rd International Conference on Nuclear Structure and Dynamics CY JUN 14-19, 2015 CL Portoroz, SLOVENIA SP Jozef Stefan Inst, Univ Zagreb, Phys Dept, Ruder Boskov Inst ID PARTICLES AB An exponential mass spectrum, like the Hagedorn spectrum, with slope 1/T-H was interpreted as fixing an upper limiting temperature T-H that the system can achieve. However, thermodynamically, such spectrum indicates a 1st order phase transition at a fixed temperature T-H. A much lower energy example is the log linear level nuclear density below the neutron binding energy that prevails throughout the nuclear chart. We show that, for non-magic nuclei, such linearity implies a 1st order phase transition from the pairing superfluid to an ideal gas of quasi particles. C1 [Moretto, Luciano G.] Univ Calif Berkeley, Dept Chem, Lawrence Berkeley Natl Lab, 1 Cyclotron Rd, Berkeley, CA 94720 USA. [Larsen, A. C.; Guttormsen, M.; Siem, S.] Univ Oslo, Dept Phys, N-0316 Oslo, Norway. RP Moretto, LG (reprint author), Univ Calif Berkeley, Dept Chem, Lawrence Berkeley Natl Lab, 1 Cyclotron Rd, Berkeley, CA 94720 USA. EM lgmoretto@lbl.gov RI Larsen, Ann-Cecilie/C-8742-2014 OI Larsen, Ann-Cecilie/0000-0002-2188-3709 NR 16 TC 0 Z9 0 U1 0 U2 2 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0094-243X BN 978-0-7354-1328-3 J9 AIP CONF PROC PY 2015 VL 1681 AR 040011 DI 10.1063/1.4932272 PG 6 WC Physics, Applied; Physics, Nuclear SC Physics GA BE3WL UT WOS:000371322600037 ER PT S AU Soderstrom, PA Regan, PH Walker, PM Watanabe, H Doornenbal, P Korkulu, Z Lee, P Liu, HL Liu, JJ Lorusso, G Nishimura, S Sumikama, T Phong, VH Wu, J Xu, FR Yagi, A Zhang, GX Alharbi, T Baba, H Browne, F Bruce, AM Carroll, R Chae, KY Dombradi, Z Estrade, A Fukuda, N Griffin, C Ideguchi, E Inabe, N Isobe, T Kanaoka, H Kojouharov, I Kondev, FG Kubo, T Kubono, S Kurz, N Kuti, I Lalkovski, S Lane, GJ Lee, CS Lee, EJ Lotay, G Moon, CB Nishizuka, I Nita, CR Odahara, A Patel, Z Podolyak, Z Roberts, OJ Sakurai, H Schaffner, H Shand, CM Suzuki, H Takeda, H Terashima, S Vajta, Z Valiente-Dobon, JJ Xu, ZY Yoshida, S AF Soederstroem, P. -A. Regan, P. H. Walker, P. M. Watanabe, H. Doornenbal, P. Korkulu, Z. Lee, P. Liu, H. L. Liu, J. J. Lorusso, G. Nishimura, S. Sumikama, T. Phong, V. H. Wu, J. Xu, F. R. Yagi, A. Zhang, G. X. Alharbi, T. Baba, H. Browne, F. Bruce, A. M. Carroll, R. Chae, K. Y. Dombradi, Zs. Estrade, A. Fukuda, N. Griffin, C. Ideguchi, E. Inabe, N. Isobe, T. Kanaoka, H. Kojouharov, I. Kondev, F. G. Kubo, T. Kubono, S. Kurz, N. Kuti, I. Lalkovski, S. Lane, G. J. Lee, C. S. Lee, E. J. Lotay, G. Moon, C. -B. Nishizuka, I. Nita, C. R. Odahara, A. Patel, Z. Podolyak, Zs. Roberts, O. J. Sakurai, H. Schaffner, H. Shand, C. M. Suzuki, H. Takeda, H. Terashima, S. Vajta, Zs. Valiente-Dobon, J. J. Xu, Z. Y. Yoshida, S. BE Lipoglavsek, M Milin, M Niksic, T Szilner, S Vretenar, D TI Heavy Rotation - Evolution of quadrupole collectivity centred at the neutron-rich doubly mid-shell nucleus Dy-170 SO NUCLEAR STRUCTURE AND DYNAMICS '15 SE AIP Conference Proceedings LA English DT Proceedings Paper CT 3rd International Conference on Nuclear Structure and Dynamics CY JUN 14-19, 2015 CL Portoroz, SLOVENIA SP Jozef Stefan Inst, Univ Zagreb, Phys Dept, Ruder Boskov Inst ID ARRAY AB In this contribution the low-excitation structural properties of the doubly mid-shell nucleus Dy-170 are discussed, with a special empasis on the evolution of the ground state rotational band within the dysprosium isotopic chain. Recent results from an experiment with the EURICA setup at RIKEN are shown in the context of previous measurements at the PRISMA + CLARA as well as the PRISMA + AGATA setups at Laboratori Nazionali di Legnaro. A brief outlook on future planned measurements is also given. C1 [Soederstroem, P. -A.; Doornenbal, P.; Lorusso, G.; Nishimura, S.; Phong, V. H.; Wu, J.; Baba, H.; Fukuda, N.; Inabe, N.; Isobe, T.; Kubo, T.; Kubono, S.; Sakurai, H.; Suzuki, H.; Takeda, H.] RIKEN, Nishina Ctr, 2-1 Hirosawa, Wako, Saitama 3510198, Japan. [Regan, P. H.; Walker, P. M.; Carroll, R.; Lalkovski, S.; Lotay, G.; Patel, Z.; Podolyak, Zs.; Shand, C. M.] Univ Surrey, Dept Phys, Guildford GU2 7XH, Surrey, England. [Regan, P. H.; Lorusso, G.] Natl Phys Lab, Teddington TW11 0LW, Middx, England. [Watanabe, H.] Beihang Univ, IRCNPC, Beijing 100191, Peoples R China. [Watanabe, H.; Zhang, G. X.; Terashima, S.] Beihang Univ, Sch Phys & Nucl Energy Engn, Beijing 100191, Peoples R China. [Korkulu, Z.; Dombradi, Zs.; Kuti, I.; Vajta, Zs.] Hungarian Acad Sci, Inst Nucl Res, H-4001 Debrecen, Hungary. [Lee, P.; Lee, C. S.] Chung Ang Univ, Dept Phys, Seoul 156756, South Korea. [Liu, H. L.] Xi An Jiao Tong Univ, Sch Sci, Dept Appl Phys, Xian 710049, Peoples R China. [Liu, J. J.; Xu, Z. Y.] Univ Hong Kong, Dept Phys, Hong Kong, Hong Kong, Peoples R China. [Sumikama, T.; Nishizuka, I.] Tohoku Univ, Dept Phys, Aoba Ku, Sendai, Miyagi 9808578, Japan. [Phong, V. H.] VNU Hanoi Univ Sci, Hanoi, Vietnam. [Wu, J.; Xu, F. R.] Peking Univ, Sch Phys, Beijing 100871, Peoples R China. [Yagi, A.; Ideguchi, E.; Kanaoka, H.; Odahara, A.; Yoshida, S.] Osaka Univ, Dept Phys, Toyonaka, Osaka 5600043, Japan. [Alharbi, T.; Bruce, A. M.] Almajmaah Univ, Coll Sci Zulfi, Dept Phys, Al Majmaah 11932, Saudi Arabia. [Browne, F.; Nita, C. R.] Univ Brighton, Sch Comp Engn & Math, Brighton BN2 4JG, E Sussex, England. [Chae, K. Y.; Lee, E. J.] Sungkyunkwan Univ, Dept Phys, Suwon 440746, South Korea. [Estrade, A.; Griffin, C.] Univ Edinburgh, Sch Phys & Astron, Edinburgh EH9 3JZ, Midlothian, Scotland. [Ideguchi, E.] Osaka Univ, RCNP, Osaka 5670047, Japan. [Kojouharov, I.; Kurz, N.; Schaffner, H.] GSI Helmholtzzentrum Schwerionenforsch GmbH, D-64291 Darmstadt, Germany. [Kondev, F. G.] Argonne Natl Lab, Nucl Engn Div, Argonne, IL 60439 USA. [Lane, G. J.] Australian Natl Univ, RSPE, Dept Nucl Phys, Canberra, ACT 0200, Australia. [Moon, C. -B.] Hoseo Univ, Asan 336795, Chungnam, South Korea. [Nita, C. R.] Horia Hulubei Natl Inst Phys & Nucl Engn, RO-077125 Bucharest, Romania. [Roberts, O. J.] Univ Coll Dublin, Sch Phys, Dublin 4, Ireland. [Sakurai, H.] Univ Tokyo, Dept Phys, Bunkyo Ku, Tokyo 1130033, Japan. [Valiente-Dobon, J. J.] Ist Nazl Fis Nucl, Lab Nazl Legnaro, I-35020 Legnaro, Italy. RP Soderstrom, PA (reprint author), RIKEN, Nishina Ctr, 2-1 Hirosawa, Wako, Saitama 3510198, Japan. EM pasoder@ribf.riken.jp RI Xu, Furong/K-4178-2013; Bruce, Alison/K-7663-2016; Roberts, Oliver/N-6284-2016; Kuti, Istvan/D-1799-2017; OI Bruce, Alison/0000-0003-2871-0517; Roberts, Oliver/0000-0002-7150-9061; Soderstrom, Par-Anders/0000-0002-9504-2814 NR 34 TC 2 Z9 2 U1 1 U2 4 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0094-243X BN 978-0-7354-1328-3 J9 AIP CONF PROC PY 2015 VL 1681 AR 030010 DI 10.1063/1.4932254 PG 5 WC Physics, Applied; Physics, Nuclear SC Physics GA BE3WL UT WOS:000371322600019 ER PT S AU Walters, WB Chiara, CJ Janssens, RVF Weisshaar, D Otsuka, T Tsunoda, Y Recchia, F Gade, A Harker, JL Albers, M Alcorta, M Bader, VM Baugher, T Bazin, D Berryman, JS Bertone, PF Campbell, CM Carpenter, MP Chen, J Crawford, HL David, HM Doherty, DT Hoffman, CR Honma, M Kondev, FG Korichi, A Langer, C Larson, N Lauritsen, T Liddick, SN Lunderberg, E Macchiavelli, AO Noji, S Prokop, C Rogers, AM Seweryniak, D Shimizu, N Stroberg, SR Suchyta, S Utsuno, Y Williams, SJ Wimmer, K Zhu, S AF Walters, W. B. Chiara, C. J. Janssens, R. V. F. Weisshaar, D. Otsuka, T. Tsunoda, Y. Recchia, F. Gade, A. Harker, J. L. Albers, M. Alcorta, M. Bader, V. M. Baugher, T. Bazin, D. Berryman, J. S. Bertone, P. F. Campbell, C. M. Carpenter, M. P. Chen, J. Crawford, H. L. David, H. M. Doherty, D. T. Hoffman, C. R. Honma, M. Kondev, F. G. Korichi, A. Langer, C. Larson, N. Lauritsen, T. Liddick, S. N. Lunderberg, E. Macchiavelli, A. O. Noji, S. Prokop, C. Rogers, A. M. Seweryniak, D. Shimizu, N. Stroberg, S. R. Suchyta, S. Utsuno, Y. Williams, S. J. Wimmer, K. Zhu, S. BE Lipoglavsek, M Milin, M Niksic, T Szilner, S Vretenar, D TI Shape Coexistence in Co-67, Ni-66,Ni-68,Ni-70,Ni-72, and Cu-71 SO NUCLEAR STRUCTURE AND DYNAMICS '15 SE AIP Conference Proceedings LA English DT Proceedings Paper CT 3rd International Conference on Nuclear Structure and Dynamics CY JUN 14-19, 2015 CL Portoroz, SLOVENIA SP Jozef Stefan Inst, Univ Zagreb, Phys Dept, Ruder Boskov Inst AB Analyses of data from both deep inelastic reactions at Argonne National Laboratory and single-and multiple-particle knockout reactions at Michigan State University revealed new gamma-ray transitions in even-even Ni-66,68,70,72(38,40,42,44) and in Co-67(40) that provide strong evidence for multiple shape coexistence at N = 38 and 40 and deep prolate minima in Ni-70(42) and isotonic Cu-71(42). A new transition at 642 keV is proposed for Ni-66 as the prolate 2(+) to 0(+) transition. Two new transitions in Ni-72 at 915 and 1225 keV were identified in the knock-out reaction study and could represent de-population of prolate states. Taken together with recent theoretical work using the Monte Carlo shell model, a well defined region of shape coexistence can be seen existing precisely between 38 <= N <= 44 for Co, Ni, and Cu nuclei. C1 [Walters, W. B.; Chiara, C. J.; Harker, J. L.] Univ Maryland, Dept Chem & Biochem, College Pk, MD 20742 USA. [Chiara, C. J.; Janssens, R. V. F.; Harker, J. L.; Albers, M.; Alcorta, M.; Bertone, P. F.; Carpenter, M. P.; David, H. M.; Doherty, D. T.; Hoffman, C. R.; Korichi, A.; Lauritsen, T.; Rogers, A. M.; Seweryniak, D.; Zhu, S.] Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA. [Weisshaar, D.; Otsuka, T.; Recchia, F.; Gade, A.; Bader, V. M.; Baugher, T.; Berryman, J. S.; Langer, C.; Larson, N.; Liddick, S. N.; Lunderberg, E.; Noji, S.; Prokop, C.; Stroberg, S. R.; Suchyta, S.; Williams, S. J.; Wimmer, K.] Michigan State Univ, Natl Superconducting Cyclotron Lab, E Lansing, MI 48824 USA. [Otsuka, T.; Tsunoda, Y.] Univ Tokyo, Dept Phys, Bunkyo Ku, Tokyo 1130033, Japan. [Otsuka, T.; Shimizu, N.] Univ Tokyo, Ctr Nucl Study, Bunkyo Ku, Tokyo 1130033, Japan. [Recchia, F.] Univ Padua, Dipartimento Fis & Astron, I-35131 Padua, Italy. [Gade, A.; Bader, V. M.; Baugher, T.; Bazin, D.; Lunderberg, E.; Stroberg, S. R.] Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA. [Campbell, C. M.; Crawford, H. L.; Macchiavelli, A. O.] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Nucl Sci, Berkeley, CA 94720 USA. [Chen, J.; Kondev, F. G.] Argonne Natl Lab, Nucl Engn Div, Argonne, IL 60439 USA. [David, H. M.; Doherty, D. T.] Univ Edinburgh, Sch Phys & Astron, Edinburgh EH9 3JZ, Midlothian, Scotland. [Honma, M.] Univ Aizu, Ctr Math Sci, Aizu Wakamatsu, Fukushima 9658580, Japan. [Korichi, A.] CNRS, IN2P3, CSNSM, Orsay Campus, F-91405 Orsay, France. [Langer, C.] Michigan State Univ, Joint Inst Nucl Astrophys, E Lansing, MI 48824 USA. [Larson, N.; Liddick, S. N.; Prokop, C.; Suchyta, S.] Michigan State Univ, Dept Chem, E Lansing, MI 48824 USA. [Utsuno, Y.] Japan Atom Energy Agcy, Adv Sci Res Ctr, Tokai, Ibaraki 3191195, Japan. [Wimmer, K.] Cent Michigan Univ, Dept Phys, Mt Pleasant, MI 48859 USA. RP Walters, WB (reprint author), Univ Maryland, Dept Chem & Biochem, College Pk, MD 20742 USA. EM wwalters@umd.edu RI Langer, Christoph/L-3422-2016; Larson, Nicole/S-5997-2016 OI Larson, Nicole/0000-0003-0292-957X NR 19 TC 0 Z9 0 U1 0 U2 1 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0094-243X BN 978-0-7354-1328-3 J9 AIP CONF PROC PY 2015 VL 1681 AR 030007 DI 10.1063/1.4932251 PG 4 WC Physics, Applied; Physics, Nuclear SC Physics GA BE3WL UT WOS:000371322600016 ER PT J AU Zalupski, PR Klaehn, JR Peterman, DR AF Zalupski, Peter R. Klaehn, John R. Peterman, Dean R. TI COMPLETE RECOVERY OF ACTINIDES FROM UREX-LIKE RAFFINATES USING A COMBINATION OF HARD AND SOFT DONOR LIGANDS. II. SOFT DONOR STRUCTURE VARIATION SO SOLVENT EXTRACTION AND ION EXCHANGE LA English DT Article DE dithiophosphinic acid; diaryldithiophosphinic acid; trioctylphosphine oxide; synergic extraction; actinide; lanthanide; separation factor; neptunium optical spectroscopy ID DENSITY-FUNCTIONAL THEORY; DITHIOPHOSPHINIC ACIDS; NITRIC-ACID; CYANEX 301; SELECTIVE EXTRACTION; SYNERGISTIC MIXTURES; CATALYZED OXIDATION; MINOR ACTINIDES; SEPARATION; LANTHANIDES AB The feasibility of simultaneous separation of uranium, neptunium, plutonium, americium, and curium from a simulated dissolved used fuel simulant adjusted to 1.0 M nitric acid is investigated using a mixture of the soft donor bis(bis-3,5-trifluoromethyl) phenyl) dithiophosphinic acid ("0") and the hard donor synergist trioctylphosphine oxide (TOPO) dissolved in toluene. The results reported in this work are compared to our recent demonstration of a complete actinide recovery from a simulated dissolved fuel solution using a synergistic combination of bis(o-trifluoromethylphenyl) dithiophosphinic acid ("1") and TOPO dissolved in either toluene or trifluoromethylphenyl sulfone. While the extraction efficiency of americium was enhanced for the liquid-liquid system containing "0", enabling to accomplish a trivalent An/Ln separation at 1.0 M HNO3, the extraction of neptunium was drastically diminished, relative to "1". The partitioning behavior of curium was also negatively impacted, introducing an effective opportunity for americium/curium separation. Radiometric and spectrophotometric studies demonstrate that the complete actinide recovery using the solvent based upon "0" and TOPO is not feasible. In addition, the importance of radiolytic degradation processes is discussed through the comparisons of extraction properties of liquid-liquid systems based on both soft donor reagents. C1 [Zalupski, Peter R.; Peterman, Dean R.] Idaho Natl Lab, Aqueous Separat & Radiochem Dept, Idaho Falls, ID 83415 USA. [Klaehn, John R.] Idaho Natl Lab, Biol & Chem Proc Dept, Idaho Falls, ID 83415 USA. RP Zalupski, PR; Peterman, DR (reprint author), Idaho Natl Lab, Aqueous Separat & Radiochem Dept, Idaho Falls, ID 83415 USA. EM Peter.Zalupski@inl.gov; Dean.Peterman@inl.gov RI Klaehn, John/C-6011-2017 OI Klaehn, John/0000-0002-7077-4509 FU U.S. Department of Energy, Office of Nuclear Energy through Fuel Cycle Research and Development Program; DOE Idaho Operations Office [DE-AC07-05ID14517] FX This research was sponsored by the U.S. Department of Energy, Office of Nuclear Energy, through the Fuel Cycle Research and Development Program. Idaho National Laboratory is operated by Battelle Energy Alliance under DOE Idaho Operations Office contract DE-AC07-05ID14517. NR 41 TC 0 Z9 0 U1 5 U2 8 PU TAYLOR & FRANCIS INC PI PHILADELPHIA PA 530 WALNUT STREET, STE 850, PHILADELPHIA, PA 19106 USA SN 0736-6299 EI 1532-2262 J9 SOLVENT EXTR ION EXC JI Solvent Extr. Ion Exch. PY 2015 VL 33 IS 6 BP 523 EP 539 DI 10.1080/07366299.2015.1064296 PG 17 WC Chemistry, Multidisciplinary SC Chemistry GA DF4DD UT WOS:000371296600001 ER PT J AU Roach, BD Williams, NJ Moyer, BA AF Roach, Benjamin D. Williams, Neil J. Moyer, Bruce A. TI THERMAL DEGRADATION OF THE SOLVENT EMPLOYED IN THE NEXT-GENERATION CAUSTIC-SIDE SOLVENT EXTRACTION PROCESS AND ITS EFFECT ON THE EXTRACTION, SCRUBBING, AND STRIPPING OF CESIUM SO SOLVENT EXTRACTION AND ION EXCHANGE LA English DT Article DE cesium; nuclear waste; process; stripping; solvent degradation; calixarene; guanidine ID IDENTIFICATION AB As part of the ongoing development of the Next-Generation Caustic-Side Solvent Extraction (NG-CSSX) process, the thermal stability of its process solvent, the Next-Generation Caustic-Side Solvent (NGS) was investigated and shown to be adequate for industrial application. The solvent was thermally treated at 35 degrees C over a period of 13 months whilst in dynamic contact with each of the aqueous phases of the current NG-CSSX process, namely SRS-15 (a highly caustic waste simulant), sodium hydroxide scrub solution (0.025 M), and boric acid strip solution (0.01 M). The effect of thermal treatment was evaluated by assessing batch extract/scrub/strip performance as a function of time, by monitoring the sodium extraction capacity of the solvent, and by analysis of the solvent using electrospray mass spectrometry. Current studies indicate that the NGS should be thermally robust without replenishment for a period of 7 months in the Modular Caustic-Side Solvent Extraction Unit (MCU), which has been treating waste using NG-CSSX since early 2014 at the Savannah River Site. The guanidine suppressor appears to be the solvent component most significantly impacted by thermal treatment of the solvent, showing significant degradation over extended operation. C1 [Roach, Benjamin D.; Williams, Neil J.; Moyer, Bruce A.] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Moyer, BA (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. EM moyerba@comcast.net RI Moyer, Bruce/L-2744-2016 OI Moyer, Bruce/0000-0001-7484-6277 FU Office of Technology Innovation and Development, Office of Environmental Management, U.S. Department of Energy FX This research was sponsored by the Office of Technology Innovation and Development, Office of Environmental Management, U.S. Department of Energy. NR 22 TC 0 Z9 0 U1 1 U2 3 PU TAYLOR & FRANCIS INC PI PHILADELPHIA PA 530 WALNUT STREET, STE 850, PHILADELPHIA, PA 19106 USA SN 0736-6299 EI 1532-2262 J9 SOLVENT EXTR ION EXC JI Solvent Extr. Ion Exch. PY 2015 VL 33 IS 6 BP 576 EP 591 DI 10.1080/07366299.2015.1064298 PG 16 WC Chemistry, Multidisciplinary SC Chemistry GA DF4DD UT WOS:000371296600004 ER PT B AU Tchernyshyov, K Meixner, M Dwek, E Temim, T Boyer, M AF Tchernyshyov, Kirill Meixner, Margaret Dwek, Eli Temim, Tea Boyer, Martha BE Kerschbaum, F Wing, RF Hron, J TI EvolutioN of Grains in the MAgellanic Clouds (ENiGMA) SO WHY GALAXIES CARE ABOUT AGB STARS III: A CLOSER LOOK IN SPACE AND TIME SE Astronomical Society of the Pacific Conference Series LA English DT Proceedings Paper CT Conference on Why Galaxies Care About AGB Stars III: A Closer Look in Space and Time CY JUL 28-AUG 01, 2014 CL Univ Vienna, Vienna, AUSTRIA SP Univ Vienna, Ohio State Univ, Robert Wing Support Fund, Austrian Sci Fund, Vienna Convent Bur HO Univ Vienna ID GIANT BRANCH STARS; DUST BUDGET; FORMATION HISTORY; EXCESS EMISSION; GLOBAL GAS; SUPERNOVAE; NUCLEOSYNTHESIS; SUBMILLIMETER; METALLICITY; HERSCHEL AB Many of the stages in the life cycle of dust are poorly understood. Historically, this has been due to a dearth of data and a corresponding lack of well-motivated theory. The Magellanic Clouds, which have been observationally studied in depth and over a wide wavelength range, are optimal locations to test and expand our theoretical knowledge of dust microphysics. Towards this end, we present a preliminary model for the evolution of metal and dust abundances in the Small Magellanic Cloud. This preliminary model includes dust production by stellar sources, dust destruction by supernova shocks, and dust and metal removal by galactic winds. We can approximately reproduce the observed metal abundances and the galaxy-wide dust production rate from Asymptotic Giant Branch (AGB) stars, but we underpredict the total dust mass by an order of magnitude. We discuss the possible effects of some of our assumptions on the predicted dust mass. C1 [Tchernyshyov, Kirill; Meixner, Margaret] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA. [Meixner, Margaret] Space Telescope Sci Inst, Baltimore, MD 21218 USA. [Dwek, Eli; Temim, Tea; Boyer, Martha] NASA, Observat Cosmol Lab, GSFC, Greenbelt, MD USA. [Temim, Tea] Univ Maryland Baltimore Cty, CRESST, Baltimore, MD 21228 USA. [Boyer, Martha] Oak Ridge Associated Univ, Oak Ridge, TN USA. RP Tchernyshyov, K (reprint author), Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA. NR 20 TC 0 Z9 0 U1 0 U2 0 PU ASTRONOMICAL SOC PACIFIC PI SAN FRANCISCO PA 390 ASHTON AVE, SAN FRANCISCO, CA 94112 USA BN 978-1-58381-879-4; 978-1-58381-878-7 J9 ASTR SOC P PY 2015 VL 497 BP 363 EP 367 PG 5 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA BE3OZ UT WOS:000371098100071 ER PT S AU Lee, WC Park, J Weitz, DA Takeuchi, S Alivisatos, AP AF Lee, Won Chul Park, Jungwon Weitz, David A. Takeuchi, Shoji Alivisatos, A. Paul GP IEEE TI MICROFABRICATED LIQUID CHAMBER UTILIZING SOLVENT-DRYING FOR IN-SITU TEM IMAGING OF NANOPARTICLE SELF-ASSEMBLY SO 2015 28TH IEEE INTERNATIONAL CONFERENCE ON MICRO ELECTRO MECHANICAL SYSTEMS (MEMS 2015) SE Proceedings IEEE Micro Electro Mechanical Systems LA English DT Proceedings Paper CT 28th IEEE International Conference on Micro Electro Mechanical Systems (MEMS) CY JAN 18-22, 2015 CL Estoril, PORTUGAL SP IEEE, IEEE Robot & Automat Soc ID ELECTRON-MICROSCOPY AB This work presents a microfabricated liquid-sample chamber for real-time TEM (Transmission Electron Microscopy) of nanoscale processes driven by liquid evaporation. Previous liquid-microchambers for TEM hold liquid samples in fully-closed (vacuum-tight) micro/nano-scale structures, thus evaporation-driven nanoscale phenomena couldn't be studied. The present work uses intended leakage/failure in bonding and e-beam induced heating in order to generate solvent-drying during TEM imaging, and the captured real-time nanometer-scale movies visualize critical steps in the self-assembly process of 2D nanoparticle arrays including the two-step crystallization process. C1 [Lee, Won Chul; Takeuchi, Shoji] Univ Tokyo, Inst Ind Sci, Tokyo, Japan. [Lee, Won Chul; Takeuchi, Shoji] JST, ERATO Takeuchi Biohybrid Innovat Project, Tokyo, Japan. [Park, Jungwon; Alivisatos, A. Paul] Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. [Park, Jungwon; Alivisatos, A. Paul] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA. [Park, Jungwon; Weitz, David A.] Harvard Univ, Sch Engn & Appl Sci, Cambridge, MA 02138 USA. RP Lee, WC (reprint author), Univ Tokyo, Inst Ind Sci, Tokyo, Japan. EM wclee@iis.u-tokyo.ac.jp NR 8 TC 0 Z9 0 U1 1 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1084-6999 BN 978-1-4799-7955-4 J9 PROC IEEE MICR ELECT PY 2015 BP 8 EP 9 PG 2 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Instruments & Instrumentation; Physics, Applied SC Engineering; Science & Technology - Other Topics; Instruments & Instrumentation; Physics GA BE3AH UT WOS:000370382900004 ER PT S AU Frank, JC Frank, SM Thurlow, LA Kroeger, TM Miller, EL Long, DDE AF Frank, Joel C. Frank, Shayna M. Thurlow, Lincoln A. Kroeger, Thomas M. Miller, Ethan L. Long, Darrell D. E. GP IEEE TI Percival: A Searchable Secret-Split Datastore SO 2015 31ST SYMPOSIUM ON MASS STORAGE SYSTEMS AND TECHNOLOGIES (MSST) SE IEEE Symposium on Mass Storage Systems and Technologies Proceedings-MSST LA English DT Proceedings Paper CT 31st Symposium on Massive Storage Systems and Technologies (MSST) CY MAY 30-JUN 05, 2015 CL Santa Clara Univ, Santa Clara, CA HO Santa Clara Univ AB Maintaining information privacy is challenging when sharing data across a distributed long-term datastore. In such applications, secret splitting the data across independent sites has been shown to be a superior alternative to fixed-key encryption; it improves reliability, reduces the risk of insider threat, and removes the issues surrounding key management. However, the inherent security of such a datastore normally precludes it from being directly searched without reassembling the data; this, however, is neither computationally feasible nor without risk since reassembly introduces a single point of compromise. As a result, the secret-split data must be pre-indexed in some way in order to facilitate searching. Previously, fixed-key encryption has also been used to securely pre-index the data, but in addition to key management issues, it is not well suited for long term applications. To meet these needs, we have developed Percival: a novel system that enables searching a secret-split datastore while maintaining information privacy. We leverage salted hashing, performed within hardware security modules, to access prerecorded queries that have been secret split and stored in a distributed environment; this keeps the bulk of the work on each client, and the data custodians blinded to both the contents of a query as well as its results. Furthermore, Percival does not rely on the datastore's exact implementation. The result is a flexible design that can be applied to both new and existing secret-split datastores. When testing Percival on a corpus of approximately one million files, it was found that the average search operation completed in less than one second. C1 [Frank, Joel C.; Frank, Shayna M.; Thurlow, Lincoln A.; Miller, Ethan L.; Long, Darrell D. E.] Univ Calif Santa Cruz, Storage Syst Res Ctr, Santa Cruz, CA 95064 USA. [Kroeger, Thomas M.] Sandia Natl Labs, Livermore, CA USA. RP Frank, JC (reprint author), Univ Calif Santa Cruz, Storage Syst Res Ctr, Santa Cruz, CA 95064 USA. NR 43 TC 0 Z9 0 U1 0 U2 0 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 USA SN 2160-195X BN 978-1-4673-7619-8 J9 IEEE S MASS STOR SYS PY 2015 PG 12 WC Computer Science, Hardware & Architecture; Computer Science, Theory & Methods; Engineering, Electrical & Electronic SC Computer Science; Engineering GA BE3KF UT WOS:000370822100023 ER PT J AU Targhetta, AD Owen, DE Israel, FL Gratz, PV AF Targhetta, Andrew D. Owen, Donald E., Jr. Israel, Francis L. Gratz, Paul V. GP IEEE TI Energy-Efficient Implementations of GF(p) and GF(2(m)) Elliptic Curve Cryptography SO 2015 33RD IEEE INTERNATIONAL CONFERENCE ON COMPUTER DESIGN (ICCD) LA English DT Proceedings Paper CT 33rd IEEE International Conference on Computer Design (ICCD) CY OCT 18-21, 2015 CL New York, NY SP IEEE, IEEE Comp Soc, IEEE Circuits & Syst Soc AB While public-key cryptography is essential for secure communications, the energy cost of even the most efficient algorithms based on Elliptic Curve Cryptography (ECC) is prohibitive on many ultra-low energy devices such as sensor-network nodes and identification tags. Although an abundance of hardware acceleration techniques for ECC have been proposed in literature, little research has focused on understanding the energy benefits of these techniques. Therefore, we evaluate the energy cost of ECC on several different hardware/software configurations across a range of security levels. Our work comprehensively explores implementations of both GF(p) and GF(2(m)) ECC, demonstrating that GF(2(m)) provides a 1.31 to 2.11 factor improvement in energy efficiency over GF(p) on an extended RISC processor. We also show that including a 4KB instruction cache in our system can reduce the energy cost of ECC by as much as 30%. Furthermore, our GF(2(m)) coprocessor achieves a 2.8 to 3.61 factor improvement in energy efficiency compared to instruction set extensions and significantly outperforms prior work. C1 [Targhetta, Andrew D.; Gratz, Paul V.] Texas A&M Univ, Elect & Comp Engn, College Stn, TX USA. [Targhetta, Andrew D.; Owen, Donald E., Jr.; Israel, Francis L.] Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Targhetta, AD (reprint author), Texas A&M Univ, Elect & Comp Engn, College Stn, TX USA. EM adtargh@sandia.gov; deowen@sandia.gov; flisrae@sandia.gov; pgratz@gratz1.com NR 26 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4673-7166-7 PY 2015 BP 704 EP 711 PG 8 WC Computer Science, Hardware & Architecture; Engineering, Electrical & Electronic SC Computer Science; Engineering GA BE3FL UT WOS:000370645200108 ER PT S AU Mitra, J Vallem, MR Singh, C AF Mitra, Joydeep Vallem, Mallikarjuna R. Singh, Chanan GP IEEE TI Optimal Deployment of Distributed Generation Using a Reliability Criterion SO 2015 51ST IEEE INDUSTRY APPLICATIONS SOCIETY ANNUAL MEETING SE IEEE Industry Applications Society Annual Meeting LA English DT Proceedings Paper CT 51st Annual Meeting of the IEEE-Industry-Applications-Society (IAS) CY OCT 11-22, 2015 CL Addison, TX SP IEEE Ind Applicat Soc DE distributed generation; microgrid; reliability; simulated annealing; siting and sizing AB This paper presents an optimal planning approach toward the design of cost-efficient and reliable microgrids. The proposed approach uses simulated annealing (SA) to determine the optimal size and location of a mix of distributed generation (DG) candidate technologies to achieve stipulated reliability criteria. The deployment plan consists of adding suitable quantities of DG at appropriate locations, and is optimal in that the cost of expansion is minimized. The paper develops the models and the approach, and describes a SA-based implementation. The method is demonstrated on a standard test system, and the application of the method as a planning tool is illustrated by means of two case studies: (i) optimal expansion of an existing distribution system into a microgrid, and (ii) evaluation of the impact of projected prices on the deployment strategy. Relative penetration of different DG technologies is also analyzed. C1 [Mitra, Joydeep] Michigan State Univ, Elect & Comp Engn, E Lansing, MI 48824 USA. [Vallem, Mallikarjuna R.] Pacific NW Natl Lab, Richland, WA 99354 USA. [Singh, Chanan] Texas A&M Univ, Elect & Comp Engn, College Stn, TX 77843 USA. RP Mitra, J (reprint author), Michigan State Univ, Elect & Comp Engn, E Lansing, MI 48824 USA. EM mitraj@msu.edu; mallikarjuna.vallem@pnnl.gov; singh@ece.tamu.edu NR 21 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 0197-2618 BN 978-1-4799-8393-3 J9 IEEE IND APPLIC SOC PY 2015 PG 9 WC Engineering, Electrical & Electronic SC Engineering GA BE3MQ UT WOS:000370974600050 ER PT S AU Mondal, A Renjit, AA Illindala, MS Eto, JH AF Mondal, Abrez Renjit, Ajit A. Illindala, Mahesh S. Eto, Joseph H. GP IEEE TI Operation and Impact of Energy Storage System in an Industrial Microgrid SO 2015 51ST IEEE INDUSTRY APPLICATIONS SOCIETY ANNUAL MEETING SE IEEE Industry Applications Society Annual Meeting LA English DT Proceedings Paper CT 51st Annual Meeting of the IEEE-Industry-Applications-Society (IAS) CY OCT 11-22, 2015 CL Addison, TX SP IEEE Ind Applicat Soc DE Microgrids; distributed power generation; frequency regulation; energy storage; industrial power systems; smart grid; load shedding ID ENGINE AB This paper analyzes the performance of a stone crushing facility powered by an islanded microgrid comprising two natural gas engine driven generator sets (also known as gensets). The goal is to achieve the microgrid performance in accordance with the ISO 8528-5 Standard. For improving the system frequency response, different approaches are evaluated including applying underfrequency load shedding and increasing generator inertia. However, it is shown that integration of energy storage system with fast frequency controls offers the best solution for satisfying the ISO 8528-5 Standard. Results from modeling and simulation using MAT LAB/Simulink are presented to show the impact on microgrid performance. C1 [Mondal, Abrez; Renjit, Ajit A.; Illindala, Mahesh S.] Ohio State Univ, Columbus, OH 43210 USA. [Eto, Joseph H.] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. RP Mondal, A (reprint author), Ohio State Univ, Columbus, OH 43210 USA. EM mondal.14@osu.edu; renjit.1@osu.edu; millindala@ieee.org; jheto@lbl.gov RI Illindala, Mahesh/B-2822-2013 OI Illindala, Mahesh/0000-0002-2015-1338 NR 29 TC 0 Z9 0 U1 2 U2 3 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 0197-2618 BN 978-1-4799-8393-3 J9 IEEE IND APPLIC SOC PY 2015 PG 7 WC Engineering, Electrical & Electronic SC Engineering GA BE3MQ UT WOS:000370974600194 ER PT S AU Anderson, DJ Carter, CM Brown, T AF Anderson, Dennis J. Carter, Charles M. Brown, Tamara GP IEEE TI Complexities of System of Systems Operational Availability Modeling SO 2015 61ST ANNUAL RELIABILITY AND MAINTAINABILITY SYMPOSIUM (RAMS 2015) SE Reliability and Maintainability Symposium LA English DT Proceedings Paper CT 61st Annual Reliability and Maintainability Symposium (RAMS) CY JAN 26-29, 2015 CL Palm Harbor, FL SP AIAA, ASQ, Elect, ASQ, Reliabil Div, IEEE Reliabil Soc, SAE Int, Inst Ind Engineers, IEST, Soc Reliabil Enineers, Int Syst Safety Soc DE system of systems; operational availability; repairable systems; reliability modeling; modeling and simulation AB Calculating operational availability (Ao) for a system of systems (SoS) presents unique challenges to reliability, availability, and maintainability (RAM) assessment, modeling, and analysis. System interdependencies and complex interrelated sustainment operations that exist in a SoS present complexities that must be accounted for in calculating or estimating Ao for the SoS. These system interdependencies affect the operating, operable, and down times of the individual systems. Both system-level and SoS-level Ao performance must be assessed within the SoS context for logistics and planning purposes. However, metrics calculated for the individual systems as part of the SoS may not be appropriate for assessing the individual system performance against their individual system requirements. In most cases, simulation modeling is required to capture the complex operating, operable, and down time hours of a SoS and the systems in the SoS, and to accurately aggregate the individual system availabilities to higher SoS levels. This paper explores some of the complexities involved in SoS Ao modeling and presents SoS simulation results from a modeled SoS application. C1 [Anderson, Dennis J.; Carter, Charles M.; Brown, Tamara] Sandia Natl Labs, POB 5800 MS 1188, Albuquerque, NM 87185 USA. RP Anderson, DJ (reprint author), Sandia Natl Labs, POB 5800 MS 1188, Albuquerque, NM 87185 USA. EM djander@sandia.gov; cmcarte@sandia.gov; tambrow@sandia.gov NR 0 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 0149-144X BN 978-1-4799-6703-2 J9 P REL MAINT S PY 2015 PG 6 WC Computer Science, Theory & Methods; Engineering, Electrical & Electronic SC Computer Science; Engineering GA BE3HX UT WOS:000370748300058 ER PT S AU Shi, Y Smith, K Wood, E Pesaran, A AF Shi, Ying Smith, Kandler Wood, Eric Pesaran, Ahmad GP IEEE TI A Multi-Node Thermal System Model for Lithium-Ion Battery Packs SO 2015 AMERICAN CONTROL CONFERENCE (ACC) SE Proceedings of the American Control Conference LA English DT Proceedings Paper CT American Control Conference CY JUL 01-03, 2015 CL Chicago, IL SP Amer Automat Control Council, IFAC, Adaptics Inc, Altair, dSPACE, Eaton Corp, Elsevier, Int Journal Automat & Comp, Journal Franklin Inst, Plexim Inc, Soc Ind & Appl Math, Springer, CRC Press Taylor & Francis Grp Cogent OA, United Technologies Res Ctr, Wiley, Boeing, Ford Motor Co, GE Global Res, Honeywell, MathWorks, Mitsubishi Elect Res Lab, Quanser DE battery pack thermal management; lithium-ion battery; system modeling ID MANAGEMENT AB Temperature is one of the main factors that control the degradation in lithium ion batteries. Accurate knowledge and control of cell temperatures in a pack helps the battery management system to maximize cell utilization and ensure pack safety and service life. In a pack with arrays of cells, a cell's temperature is not only affected by its own thermal characteristics but also by its neighbors, the cooling system and pack configuration, which increase the noise level and the complexity of cell temperature prediction. This work proposes to model lithium-ion packs' thermal behavior using a multi-node thermal network model, which predicts the cell temperatures by zones. The model was parametrized and validated using commercial lithium-ion battery packs. C1 [Shi, Ying; Smith, Kandler; Wood, Eric; Pesaran, Ahmad] Natl Renewable Energy Lab, Golden, CO 80401 USA. RP Shi, Y (reprint author), Natl Renewable Energy Lab, Golden, CO 80401 USA. EM ying.shi@nrel.gov; kandler.smith@nrel.gov; eric.wood@nrel.gov; ahmad.pesaran@nrel.gov NR 12 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 0743-1619 BN 978-1-4799-8684-2 J9 P AMER CONTR CONF PY 2015 BP 723 EP 727 PG 5 WC Automation & Control Systems; Engineering, Electrical & Electronic SC Automation & Control Systems; Engineering GA BE2YC UT WOS:000370259200117 ER PT S AU Smith, K Shi, Y Santhanagopalan, S AF Smith, Kandler Shi, Ying Santhanagopalan, Shriram GP IEEE TI Degradation mechanisms and lifetime prediction for lithium-ion batteries - A control perspective SO 2015 AMERICAN CONTROL CONFERENCE (ACC) SE Proceedings of the American Control Conference LA English DT Proceedings Paper CT American Control Conference CY JUL 01-03, 2015 CL Chicago, IL SP Amer Automat Control Council, IFAC, Adaptics Inc, Altair, dSPACE, Eaton Corp, Elsevier, Int Journal Automat & Comp, Journal Franklin Inst, Plexim Inc, Soc Ind & Appl Math, Springer, CRC Press Taylor & Francis Grp Cogent OA, United Technologies Res Ctr, Wiley, Boeing, Ford Motor Co, GE Global Res, Honeywell, MathWorks, Mitsubishi Elect Res Lab, Quanser DE battery; degradation; diagnostics; energy storage; lithium-ion; prognostics ID SOLID-ELECTROLYTE INTERPHASE; MATHEMATICAL-MODEL; CELL AB Predictive models of Li-ion battery lifetime must consider a multiplicity of electrochemical, thermal, and mechanical degradation modes experienced by batteries in application environments. To complicate matters, Li-ion batteries can experience different degradation trajectories that depend on storage and cycling history of the application environment. Rates of degradation are controlled by factors such as temperature history, electrochemical operating window, and charge/discharge rate. We present a generalized battery life prognostic model framework for battery systems design and control. The model framework consists of trial functions that are statistically regressed to Li-ion cell life datasets wherein the cells have been aged under different levels of stress. Degradation mechanisms and rate laws dependent on temperature, storage, and cycling condition are regressed to the data, with multiple model hypotheses evaluated and the best model down-selected based on statistics. The resulting life prognostic model, implemented in state variable form, is extensible to arbitrary real-world scenarios. The model is applicable in real-time control algorithms to maximize battery life and performance. We discuss efforts to reduce lifetime prediction error and accommodate its inevitable impact in controller design. C1 [Smith, Kandler; Shi, Ying; Santhanagopalan, Shriram] Natl Renewable Energy Lab, Golden, CO 80401 USA. RP Smith, K (reprint author), Natl Renewable Energy Lab, Golden, CO 80401 USA. EM kandler.smith@nrel.gov; ying.shi@nrel.gov; shriram.santhanagopalan@nrel.gov NR 23 TC 0 Z9 0 U1 3 U2 5 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 0743-1619 BN 978-1-4799-8684-2 J9 P AMER CONTR CONF PY 2015 BP 728 EP 730 PG 3 WC Automation & Control Systems; Engineering, Electrical & Electronic SC Automation & Control Systems; Engineering GA BE2YC UT WOS:000370259200118 ER PT S AU Gebraad, PMO Fleming, PA van Wingerden, JW AF Gebraad, P. M. O. Fleming, P. A. van Wingerden, J. W. GP IEEE TI Comparison of Actuation Methods for Wake Control in Wind Plants SO 2015 AMERICAN CONTROL CONFERENCE (ACC) SE Proceedings of the American Control Conference LA English DT Proceedings Paper CT American Control Conference CY JUL 01-03, 2015 CL Chicago, IL SP Amer Automat Control Council, IFAC, Adaptics Inc, Altair, dSPACE, Eaton Corp, Elsevier, Int Journal Automat & Comp, Journal Franklin Inst, Plexim Inc, Soc Ind & Appl Math, Springer, CRC Press Taylor & Francis Grp Cogent OA, United Technologies Res Ctr, Wiley, Boeing, Ford Motor Co, GE Global Res, Honeywell, MathWorks, Mitsubishi Elect Res Lab, Quanser ID TURBINE WAKE AB In recent research, cooperative wind turbine control strategies have been proposed to optimize overall performance of wind plants by taking into account the aerodynamic interaction effects that the wind turbines have on each other through their wakes. Wind plant control strategies have different ways of using the control degrees of freedom (DOFs) of the turbine. Conventional control DOFs of a wind turbine are the pitch angles of the blades, the generator torque, and the yaw angle of the rotor. In most wind plant control approaches in literature, the generator torque and/or blade pitch control DOF is used to affect the wake velocity deficit (referred to as axial-induction-based control). In recent studies, an alternative control method was used, in which the direction of the wake is changed using the yaw DOF such that the overlap of the wake with downstream rotors is avoided or reduced (wake redirection control). In this paper, we present a high-fidelity, computational fluid dynamics simulation case study, in which the potential of both control methods is compared, in terms of their effect on power production of a two-turbine setup. For the flow conditions and turbine considered in the case study, wake-redirection control is shown to have a larger potential to improve wind plant energy production than axial-induction-based control. An additional analysis shows that causes for the difference in potential are wake expansion and meandering. C1 [Gebraad, P. M. O.; Fleming, P. A.] Natl Renewable Energy Lab, Golden, CO 80401 USA. [van Wingerden, J. W.] Delft Univ Technol, Delft Ctr Syst & Control, NL-2600 AA Delft, Netherlands. RP Gebraad, PMO (reprint author), Natl Renewable Energy Lab, Golden, CO 80401 USA. EM pieter.gebraad@nrel.gov; j.w.vanwingerden@tudelft.nl OI Fleming, Paul/0000-0001-8249-2544 NR 15 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 0743-1619 BN 978-1-4799-8684-2 J9 P AMER CONTR CONF PY 2015 BP 1695 EP 1701 PG 7 WC Automation & Control Systems; Engineering, Electrical & Electronic SC Automation & Control Systems; Engineering GA BE2YC UT WOS:000370259201127 ER PT S AU Gebraad, PMO Fleming, PA van Wingerden, JW AF Gebraad, P. M. O. Fleming, P. A. van Wingerden, J. W. GP IEEE TI Wind Turbine Wake Estimation and Control Using FLORIDyn, a Control-Oriented Dynamic Wind Plant Model SO 2015 AMERICAN CONTROL CONFERENCE (ACC) SE Proceedings of the American Control Conference LA English DT Proceedings Paper CT American Control Conference CY JUL 01-03, 2015 CL Chicago, IL SP Amer Automat Control Council, IFAC, Adaptics Inc, Altair, dSPACE, Eaton Corp, Elsevier, Int Journal Automat & Comp, Journal Franklin Inst, Plexim Inc, Soc Ind & Appl Math, Springer, CRC Press Taylor & Francis Grp Cogent OA, United Technologies Res Ctr, Wiley, Boeing, Ford Motor Co, GE Global Res, Honeywell, MathWorks, Mitsubishi Elect Res Lab, Quanser AB In this paper we present estimation and control results for wind plants, based on FLORIDyn, a novel control-oriented dynamic model for wake interaction effects between wind turbines in a wind plant. The model predicts wake locations, effective flow velocities, and electrical energy production at each turbine as a function of the control degrees of freedom of the turbines. The model includes the dynamic wake propagation effects that cause time delays between control-setting changes and the response of downstream turbines. These delays are a function of the state of the flow field in the wind plant. The model has a state-space structure combined with a nonlinear feedback term. A Kalman filter is developed for the model that corrects the flow field predictions using wind turbine power production measurements. The computational complexity of the model is small enough that it has the potential to be used for optimizing the control reference signals for improved wind plant control, as demonstrated in a case study. C1 [Gebraad, P. M. O.; Fleming, P. A.] Natl Renewable Energy Lab, Golden, CO 80401 USA. [van Wingerden, J. W.] Delft Univ Technol, Delft Ctr Syst & Control, NL-2600 AA Delft, Netherlands. RP Gebraad, PMO (reprint author), Natl Renewable Energy Lab, Golden, CO 80401 USA. EM pieter.gebraad@nrel.gov; j.w.vanwingerden@tudelft.nl OI Fleming, Paul/0000-0001-8249-2544 NR 8 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 0743-1619 BN 978-1-4799-8684-2 J9 P AMER CONTR CONF PY 2015 BP 1702 EP 1708 PG 7 WC Automation & Control Systems; Engineering, Electrical & Electronic SC Automation & Control Systems; Engineering GA BE2YC UT WOS:000370259201128 ER PT S AU Dall'Anese, E Dhople, SV Giannakis, GB AF Dall'Anese, Emiliano Dhople, Sairaj V. Giannakis, Georgios B. GP IEEE TI Regulation of Dynamical Systems to Optimal Solutions of Semidefinite Programs: Algorithms and Applications to AC Optimal Power Flow SO 2015 AMERICAN CONTROL CONFERENCE (ACC) SE Proceedings of the American Control Conference LA English DT Proceedings Paper CT American Control Conference CY JUL 01-03, 2015 CL Chicago, IL SP Amer Automat Control Council, IFAC, Adaptics Inc, Altair, dSPACE, Eaton Corp, Elsevier, Int Journal Automat & Comp, Journal Franklin Inst, Plexim Inc, Soc Ind & Appl Math, Springer, CRC Press Taylor & Francis Grp Cogent OA, United Technologies Res Ctr, Wiley, Boeing, Ford Motor Co, GE Global Res, Honeywell, MathWorks, Mitsubishi Elect Res Lab, Quanser ID RESIDENTIAL DISTRIBUTION-SYSTEMS; PHOTOVOLTAIC INVERTERS; OPTIMAL DISPATCH; CONVEX AB This paper considers a collection of networked nonlinear dynamical systems, and addresses the synthesis of feedback controllers that seek optimal operating points corresponding to the solution of pertinent network-wide optimization problems. Particular emphasis is placed on the solution of semidefinite programs (SDPs). The design of the feedback controller is grounded on a dual epsilon-subgradient approach, with the dual iterates utilized to dynamically update the dynamicalsystem reference signals. Global convergence is guaranteed for diminishing stepsize rules, even when the reference inputs are updated at a faster rate than the dynamical-system settling time. The application of the proposed framework to the control of power-electronic inverters in AC distribution systems is discussed. The objective is to bridge the time-scale separation between real-time inverter control and network-wide optimization. Optimization objectives assume the form of SDP relaxations of prototypical AC optimal power flow problems. C1 [Dall'Anese, Emiliano] Natl Renewable Energy Lab, Golden, CO USA. [Dhople, Sairaj V.; Giannakis, Georgios B.] Univ Minnesota, Dept ECE, Minneapolis, MN USA. [Dhople, Sairaj V.; Giannakis, Georgios B.] Univ Minnesota, Digital Tech Ctr, Minneapolis, MN USA. RP Dall'Anese, E (reprint author), Natl Renewable Energy Lab, Golden, CO USA. EM emiliano.dallanese@nrel.gov; sdhople@umn.edu; georgios@umn.edu NR 21 TC 2 Z9 2 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 0743-1619 BN 978-1-4799-8684-2 J9 P AMER CONTR CONF PY 2015 BP 2087 EP 2092 PG 6 WC Automation & Control Systems; Engineering, Electrical & Electronic SC Automation & Control Systems; Engineering GA BE2YC UT WOS:000370259202030 ER PT S AU Sinha, M Dorfler, F Johnson, BB Dhople, SV AF Sinha, Mohit Doerfler, Florian Johnson, Brian B. Dhople, Sairaj V. GP IEEE TI Virtual Oscillator Control Subsumes Droop Control SO 2015 AMERICAN CONTROL CONFERENCE (ACC) SE Proceedings of the American Control Conference LA English DT Proceedings Paper CT American Control Conference CY JUL 01-03, 2015 CL Chicago, IL SP Amer Automat Control Council, IFAC, Adaptics Inc, Altair, dSPACE, Eaton Corp, Elsevier, Int Journal Automat & Comp, Journal Franklin Inst, Plexim Inc, Soc Ind & Appl Math, Springer, CRC Press Taylor & Francis Grp Cogent OA, United Technologies Res Ctr, Wiley, Boeing, Ford Motor Co, GE Global Res, Honeywell, MathWorks, Mitsubishi Elect Res Lab, Quanser ID INVERTERS; PARALLEL; SYNCHRONIZATION; MICROGRIDS; OPERATION AB In this paper we examine the amplitude and phase dynamics of power-electronic inverters in islanded microgrids that are controlled to emulate the dynamics of a class of weakly nonlinear Lienard-type oscillators. The general strategy of controlling inverters to emulate the behavior of Lienard-type oscillators is termed Virtual Oscillator Control (VOC), and it presents a compelling time-domain alternative to ubiquitous droop control methods which linearly trade off voltage frequencies and magnitudes with active and reactive power injections. In comparison to droop control, which assumes a priori that the network operates in a quasi-stationary sinusoidal steady state, VOC is a time-domain control strategy that globally stabilizes a desired sinusoidal steady state. The main, and somewhat surprising, result of this paper is that-when reduced to the sinusoidal steady state-the VOC dynamics correspond to those of droop control. Hence, VOC is a globally stabilizing control strategy that can deal with higher-order harmonics and includes droop control in the harmonic steady state. The results are intriguing, in that they suggest that droop control laws can be recovered from averaging the complex dynamics of a class of weakly nonlinear limit-cycle oscillators. C1 [Sinha, Mohit; Dhople, Sairaj V.] Univ Minnesota UMN, Dept Elect & Comp Engn, Minneapolis, MN USA. [Doerfler, Florian] Swiss Fed Inst Technol, Automat Control Lab, Zurich, Switzerland. [Johnson, Brian B.] NREL, Power Syst Engn Ctr, Golden, CO USA. RP Sinha, M (reprint author), Univ Minnesota UMN, Dept Elect & Comp Engn, Minneapolis, MN USA. EM sinha052@UMN.EDU; dorfler@ETHZ.CH; brian.johnson@NREL.GOV; sdhople@UMN.EDU NR 20 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 0743-1619 BN 978-1-4799-8684-2 J9 P AMER CONTR CONF PY 2015 BP 2353 EP 2358 PG 6 WC Automation & Control Systems; Engineering, Electrical & Electronic SC Automation & Control Systems; Engineering GA BE2YC UT WOS:000370259202073 ER PT S AU Sun, YN Somani, A Carroll, TE AF Sun, Yannan Somani, Abhishek Carroll, Thomas E. GP IEEE TI Learning Based Bidding Strategy for HVAC Systems in Double Auction Retail Energy Markets SO 2015 AMERICAN CONTROL CONFERENCE (ACC) SE Proceedings of the American Control Conference LA English DT Proceedings Paper CT American Control Conference CY JUL 01-03, 2015 CL Chicago, IL SP Amer Automat Control Council, IFAC, Adaptics Inc, Altair, dSPACE, Eaton Corp, Elsevier, Int Journal Automat & Comp, Journal Franklin Inst, Plexim Inc, Soc Ind & Appl Math, Springer, CRC Press Taylor & Francis Grp Cogent OA, United Technologies Res Ctr, Wiley, Boeing, Ford Motor Co, GE Global Res, Honeywell, MathWorks, Mitsubishi Elect Res Lab, Quanser DE reinforcement learning; demand response; energy markets AB In this paper, we propose a reinforcement learning bidding strategy for controlling and coordinating HVAC systems in a double auction market. The bidding strategy does not require a specific model-based representation of behavior, i. e., a functional form to translate indoor house temperatures into bid prices. The results from reinforcement learning based approach are compared with the HVAC bidding approach used in the AEP gridSMART (R) smart grid demonstration project and it is shown that the model-free (learning based) approach tracks well the results from the model-based behavior. Successful use of model-free approaches to represent device-level economic behavior may advance similar approaches to represent behavior of more complex devices or groups of diverse devices, such as the aggregate behavior of responding devices in a building. C1 [Sun, Yannan; Somani, Abhishek; Carroll, Thomas E.] Pacific NW Natl Lab, Richland, WA 99352 USA. RP Sun, YN (reprint author), Pacific NW Natl Lab, Richland, WA 99352 USA. EM yannan.sun@pnnl.gov; abhishek.somani@pnnl.gov; thomas.carroll@pnnl.gov NR 7 TC 0 Z9 0 U1 1 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 0743-1619 BN 978-1-4799-8684-2 J9 P AMER CONTR CONF PY 2015 BP 2912 EP 2917 PG 6 WC Automation & Control Systems; Engineering, Electrical & Electronic SC Automation & Control Systems; Engineering GA BE2YC UT WOS:000370259203002 ER PT S AU Navalkar, ST van Wingerden, JW Fleming, PA van Kuik, GAM AF Navalkar, S. T. van Wingerden, J. W. Fleming, P. A. van Kuik, G. A. M. GP IEEE TI Integrating Robust Lidar-Based Feedforward with Feedback Control to Enhance Speed Regulation of Floating Wind Turbines SO 2015 AMERICAN CONTROL CONFERENCE (ACC) SE Proceedings of the American Control Conference LA English DT Proceedings Paper CT American Control Conference CY JUL 01-03, 2015 CL Chicago, IL SP Amer Automat Control Council, IFAC, Adaptics Inc, Altair, dSPACE, Eaton Corp, Elsevier, Int Journal Automat & Comp, Journal Franklin Inst, Plexim Inc, Soc Ind & Appl Math, Springer, CRC Press Taylor & Francis Grp Cogent OA, United Technologies Res Ctr, Wiley, Boeing, Ford Motor Co, GE Global Res, Honeywell, MathWorks, Mitsubishi Elect Res Lab, Quanser AB The structural cost of offshore wind energy can be drastically reduced by the development of floating wind turbines. However, the design of a feedback controller for rotor speed control of such turbines faces fundamental bandwidth limitations because of the presence of nonminimum phase zeros. New developments in lidar technology enable turbines to measure the incoming wind and use the measurements for feedforward control. This paper explores the possibility of combining lidar feedforward with feedback control for floating wind turbines to enhance the speed control performance and increase controller bandwidth without affecting stability. Robust stability and performance of the controllers are investigated. The controllers are validated using the high-fidelity simulation environment FAST for floating turbines with lidar, and enhanced control performance is achieved. C1 [Navalkar, S. T.; van Wingerden, J. W.] Delft Univ Technol, Delft Ctr Syst & Control, NL-2628 CD Delft, Netherlands. [Fleming, P. A.] Natl Renewable Energy Lab, Natl Wind Technol Ctr, Golden, CO 80401 USA. [van Kuik, G. A. M.] Delft Univ Technol, Wind Energy Grp, NL-2629 HS Delft, Netherlands. RP Navalkar, ST (reprint author), Delft Univ Technol, Delft Ctr Syst & Control, NL-2628 CD Delft, Netherlands. EM s.t.navalkar@tudelft.nl OI Fleming, Paul/0000-0001-8249-2544 NR 12 TC 1 Z9 1 U1 0 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 0743-1619 BN 978-1-4799-8684-2 J9 P AMER CONTR CONF PY 2015 BP 3070 EP 3075 PG 6 WC Automation & Control Systems; Engineering, Electrical & Electronic SC Automation & Control Systems; Engineering GA BE2YC UT WOS:000370259203027 ER PT S AU Haizmann, F Schlipf, D Raach, S Scholbrock, A Wright, A Slinger, C Medley, J Harris, M Bossanyi, E Cheng, PW AF Haizmann, Florian Schlipf, David Raach, Steffen Scholbrock, Andrew Wright, Alan Slinger, Chris Medley, John Harris, Michael Bossanyi, Ervin Cheng, Po Wen GP IEEE TI Optimization of a Feed-Forward Controller Using a CW-lidar System on the CART3 SO 2015 AMERICAN CONTROL CONFERENCE (ACC) SE Proceedings of the American Control Conference LA English DT Proceedings Paper CT American Control Conference CY JUL 01-03, 2015 CL Chicago, IL SP Amer Automat Control Council, IFAC, Adaptics Inc, Altair, dSPACE, Eaton Corp, Elsevier, Int Journal Automat & Comp, Journal Franklin Inst, Plexim Inc, Soc Ind & Appl Math, Springer, CRC Press Taylor & Francis Grp Cogent OA, United Technologies Res Ctr, Wiley, Boeing, Ford Motor Co, GE Global Res, Honeywell, MathWorks, Mitsubishi Elect Res Lab, Quanser ID WIND TURBINES AB This work presents results from a new field-testing campaign conducted on the three-bladed Controls Advanced Research Turbine (CART3) at the National Renewable Energy Laboratory in 2014. Tests were conducted using a commercially available, nacelle-mounted continuous-wave lidar system from ZephIR Lidar for the implementation of a lidar-based collective pitch feed-forward controller. During the campaign, the data processing of the lidar system was optimized for higher availability. Furthermore, the optimal scan distance was investigated for the CART3 by means of a spectra-based analytical model and found to match the lidar's capabilities well. Throughout the campaign the predicted correlation between the lidar measurements and the turbine's reaction was confirmed from the measured data. Additionally, the baseline feedback controller's gains were tuned based on a simulation study that included the lidar system to achieve further load reductions. This led to some promising first results, which are presented at the end of this paper. C1 [Haizmann, Florian; Schlipf, David; Raach, Steffen; Cheng, Po Wen] Univ Stuttgart, Stuttgart, Germany. [Scholbrock, Andrew; Wright, Alan] Natl Renewable Energy Lab, Golden, CO USA. [Slinger, Chris; Medley, John; Harris, Michael] ZephIR Lidar, Hollybush, Ledbury, England. [Bossanyi, Ervin] DNV GL, Bristol, Avon, England. RP Haizmann, F (reprint author), Univ Stuttgart, Stuttgart, Germany. EM Florian.Haizmann@ifb.uni-stuttgart.de; David.Schlipf@ifb.uni-stuttgart.de; Steffen.Raach@ifb.uni-stuttgart.de; Andrew.Scholbrock@nrel.gov; Alan.wright@nrel.gov; Chris.Slinger@nrel.gov; John.Medley@nrel.gov; Michael.Harris@zephirlidar.com; Ervin.Bossanyi@dnvgl.com NR 16 TC 3 Z9 3 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 0743-1619 BN 978-1-4799-8684-2 J9 P AMER CONTR CONF PY 2015 BP 3715 EP 3720 PG 6 WC Automation & Control Systems; Engineering, Electrical & Electronic SC Automation & Control Systems; Engineering GA BE2YC UT WOS:000370259203130 ER PT S AU Malikopoulos, AA Maroulas, V Xiong, J AF Malikopoulos, Andreas A. Maroulas, Vasileios Xiong, Jie GP IEEE TI A Multiobjective Optimization Framework for Stochastic Control of Complex Systems SO 2015 AMERICAN CONTROL CONFERENCE (ACC) SE Proceedings of the American Control Conference LA English DT Proceedings Paper CT American Control Conference CY JUL 01-03, 2015 CL Chicago, IL SP Amer Automat Control Council, IFAC, Adaptics Inc, Altair, dSPACE, Eaton Corp, Elsevier, Int Journal Automat & Comp, Journal Franklin Inst, Plexim Inc, Soc Ind & Appl Math, Springer, CRC Press Taylor & Francis Grp Cogent OA, United Technologies Res Ctr, Wiley, Boeing, Ford Motor Co, GE Global Res, Honeywell, MathWorks, Mitsubishi Elect Res Lab, Quanser AB This paper addresses the problem of minimizing the long-run expected average cost of a complex system consisting of subsystems that interact with each other and the environment. We treat the stochastic control problem as a multiobjective optimization problem of the one-stage expected costs of the subsystems, and we show that the control policy yielding the Pareto optimal solution is an optimal control policy that minimizes the average cost criterion for the entire system. For practical situations with constraints consistent to those we study here, our results imply that the Pareto control policy may be of value in deriving online an optimal control policy in complex systems. C1 [Malikopoulos, Andreas A.] Oak Ridge Natl Lab, Energy & Transportat Sci Div, Oak Ridge, TN 37831 USA. [Maroulas, Vasileios] Univ Tennessee, Dept Math, Knoxville, TN 37996 USA. [Xiong, Jie] Univ Macau, Dept Math, Macau, Peoples R China. RP Malikopoulos, AA (reprint author), Oak Ridge Natl Lab, Energy & Transportat Sci Div, Oak Ridge, TN 37831 USA. EM andreas@ornl.gov NR 17 TC 1 Z9 1 U1 1 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 0743-1619 BN 978-1-4799-8684-2 J9 P AMER CONTR CONF PY 2015 BP 4263 EP 4268 PG 6 WC Automation & Control Systems; Engineering, Electrical & Electronic SC Automation & Control Systems; Engineering GA BE2YC UT WOS:000370259204061 ER PT S AU Kundu, S Anghel, M AF Kundu, Soumya Anghel, Marian GP IEEE TI A Sum-of-Squares Approach to the Stability and Control of Interconnected Systems using Vector Lyapunov Functions SO 2015 AMERICAN CONTROL CONFERENCE (ACC) SE Proceedings of the American Control Conference LA English DT Proceedings Paper CT American Control Conference CY JUL 01-03, 2015 CL Chicago, IL SP Amer Automat Control Council, IFAC, Adaptics Inc, Altair, dSPACE, Eaton Corp, Elsevier, Int Journal Automat & Comp, Journal Franklin Inst, Plexim Inc, Soc Ind & Appl Math, Springer, CRC Press Taylor & Francis Grp Cogent OA, United Technologies Res Ctr, Wiley, Boeing, Ford Motor Co, GE Global Res, Honeywell, MathWorks, Mitsubishi Elect Res Lab, Quanser AB Stability analysis tools are essential to understanding and controlling any engineering system. Recently, sum-of-squares (SOS) based methods have been used to compute Lyapunov based estimates for the region-of-attraction (ROA) of polynomial dynamical systems. But for a real-life large scale dynamical system this method becomes inapplicable because of growing computational burden. In such a case, it is important to develop a subsystem based stability analysis approach which is the focus of the work presented here. A parallel and scalable algorithm is used to infer stability of an interconnected system, with the help of the subsystem Lyapunov functions. Locally computable control laws are proposed to guarantee asymptotic stability under a given disturbance. C1 [Kundu, Soumya] Los Alamos Natl Lab, Ctr Nonlinear Studies, Los Alamos, NM 87545 USA. [Kundu, Soumya; Anghel, Marian] Los Alamos Natl Lab, Informat Sci Grp CCS 3, Los Alamos, NM 87545 USA. RP Kundu, S (reprint author), Los Alamos Natl Lab, Ctr Nonlinear Studies, Los Alamos, NM 87545 USA. EM soumya@lanl.gov; manghel@lanl.gov NR 28 TC 0 Z9 0 U1 0 U2 3 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 0743-1619 BN 978-1-4799-8684-2 J9 P AMER CONTR CONF PY 2015 BP 5022 EP 5028 PG 7 WC Automation & Control Systems; Engineering, Electrical & Electronic SC Automation & Control Systems; Engineering GA BE2YC UT WOS:000370259205021 ER PT S AU Dvijotham, K Chertkov, M AF Dvijotham, Krishnamurthy Chertkov, Michael GP IEEE TI Convexity of Structure Preserving Energy Functions in Power Transmission: Novel Results and Applications SO 2015 AMERICAN CONTROL CONFERENCE (ACC) SE Proceedings of the American Control Conference LA English DT Proceedings Paper CT American Control Conference CY JUL 01-03, 2015 CL Chicago, IL SP Amer Automat Control Council, IFAC, Adaptics Inc, Altair, dSPACE, Eaton Corp, Elsevier, Int Journal Automat & Comp, Journal Franklin Inst, Plexim Inc, Soc Ind & Appl Math, Springer, CRC Press Taylor & Francis Grp Cogent OA, United Technologies Res Ctr, Wiley, Boeing, Ford Motor Co, GE Global Res, Honeywell, MathWorks, Mitsubishi Elect Res Lab, Quanser ID TRANSIENT STABILITY ANALYSIS; SYSTEMS AB It is well-known in the power systems literature that the behavior of the transmission power system (under certain simplifying assumptions) can be used to study the post-fault dynamics of a power system and provide principled estimates on dynamic stability margins. In this paper, we study a special feature of the energy function that has previously received little attention: convexity. We prove that the energy function for structure preserving models of power systems is convex under certain reasonable conditions on phases and voltages. Beyond stability analysis, these convexity results have a number of applications, noticeably, building a provably convergent PF solver, which we discuss in detail in this paper. We also outline potential applications to reformulating Optimum Power Flow (OPF), Model Predictive Control (MPC) and identifying the most probable failure (instanton) as convex optimization problems. C1 [Dvijotham, Krishnamurthy] CALTECH, Dept Comp & Math Sci, Pasadena, CA 91125 USA. [Chertkov, Michael] Los Alamos Natl Lab, T Div, Los Alamos, NM USA. [Chertkov, Michael] Los Alamos Natl Lab, Ctr Nonlinear Studies, Los Alamos, NM 87545 USA. RP Dvijotham, K (reprint author), CALTECH, Dept Comp & Math Sci, Pasadena, CA 91125 USA. EM dvij@cs.washington.edu; chertkov@lanl.gov RI Chertkov, Michael/O-8828-2015 NR 26 TC 0 Z9 0 U1 1 U2 4 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 0743-1619 BN 978-1-4799-8684-2 J9 P AMER CONTR CONF PY 2015 BP 5035 EP 5042 PG 8 WC Automation & Control Systems; Engineering, Electrical & Electronic SC Automation & Control Systems; Engineering GA BE2YC UT WOS:000370259205023 ER PT S AU Okoro, C Levine, LE Xu, RQ Obeng, YS AF Okoro, Chukwudi Levine, Lyle E. Xu, Ruqing Obeng, Yaw S. GP IEEE TI Experimentally, How Does Cu TSV Diameter Influence its Stress State? SO 2015 IEEE 65TH ELECTRONIC COMPONENTS AND TECHNOLOGY CONFERENCE (ECTC) SE Electronic Components and Technology Conference LA English DT Proceedings Paper CT IEEE 65th Electronic Components and Technology Conference (ECTC) CY MAY 26-29, 2015 CL San Diego, CA SP IEEE, IEEE Components, Packaging, & Mfg Technol Soc ID THROUGH-SILICON VIAS; COPPER AB In this work, an experimental study of the influence of Cu through-silicon via (TSV) diameter on stress build up was performed using synchrotron-based X-ray microdiffraction technique. Three Cu TSV diameters were studied; 3 mu m, 5 mu m and 8 mu m, all of which were fabricated in a single chip. Prior to the measurements, the die was annealed at 420 degrees C (30 min), yielding a fully grown and stable microstructure. The measured mean hydrostatic stresses in the Cu TSV were 185 +/- 14 MPa (3 mu m Cu TSV diameter), 147 +/- 10 MPa (5 mu m Cu TSV diameter) and 205 +/- 15 MPa (8 mu m Cu TSV diameter). As such, no conclusive stress dependence on Cu TSV diameter was determined. This is attributed to stress relaxation mechanisms including plastic deformation, grain boundary sliding, dislocation motion and the formation of cracks/voids which are otherwise neglected in many reported finite element modeling based studies. Additionally, this study underscores that the stress-strain behavior of Cu TSVs are significantly dependent on their thermal history and microstructural characteristics. C1 [Okoro, Chukwudi; Obeng, Yaw S.] NIST, Semicond & Dimens Metrol Div, 100 Bur Dr, Gaithersburg, MD 20899 USA. [Levine, Lyle E.] NIST, Mat Sci & Engn Div, 100 Bur Dr, Gaithersburg, MD 20899 USA. [Xu, Ruqing] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. [Okoro, Chukwudi] Theiss Res, La Jolla, CA 92037 USA. RP Okoro, C (reprint author), NIST, Semicond & Dimens Metrol Div, 100 Bur Dr, Gaithersburg, MD 20899 USA. EM chukwudi.okoro@nist.gov NR 20 TC 2 Z9 2 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 0569-5503 J9 ELEC COMP C PY 2015 BP 54 EP 58 PG 5 WC Computer Science, Theory & Methods; Engineering, Electrical & Electronic SC Computer Science; Engineering GA BE2YF UT WOS:000370285100010 ER PT S AU Liu, YX Tamura, N Kim, DW Gu, S Tu, KN AF Liu, Yingxia Tamura, Nobumichi Kim, Dong Wook Gu, Sam Tu, K. N. GP IEEE TI Effect of Au/Pd Surface Finishing on Metastable Sn Phase Formation in Microbumps SO 2015 IEEE 65TH ELECTRONIC COMPONENTS AND TECHNOLOGY CONFERENCE (ECTC) SE Electronic Components and Technology Conference LA English DT Proceedings Paper CT IEEE 65th Electronic Components and Technology Conference (ECTC) CY MAY 26-29, 2015 CL San Diego, CA SP IEEE, IEEE Components, Packaging, & Mfg Technol Soc ID NI/AU METALLIZATION; SOLDER JOINTS; EMBRITTLEMENT AB A metastable phase of Sn has been found to co-exist with beta-Sn in Pb-free SnAg microbumps in 3D integrated circuit (3D IC) technology. Synchrotron microbeam x-ray diffraction, high-resolution TEM imaging and selected-area electron diffraction were used to confirm the metastable phase, which has a orthorhombic lattice, with lattice parameter a = 0.635 nm, b = 0.639 nm, and c = 1.147 nm. Its composition is Sn containing about 10 percent of Ni, a few percent of Au and Pd. The structure is probably isostructural with those of Sn4Au, and Sn4Pd with Ni replacing the noble metal. The formation of this phase may be because of Au and Pd in surface finishing for Ni. With only one reflow, this new phase could form almost continuously in microbumps solder when the thickness of solder layer shrinks to 2 mu m. The formation of this phase implies the well adopted Au/Pd surface finishing structure may cause potential reliability problems in 3D IC. C1 [Liu, Yingxia; Tu, K. N.] Univ Calif Los Angeles, Dept Mat Sci & Engn, Los Angeles, CA 90095 USA. [Tamura, Nobumichi] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Adv Light Source, Berkeley, CA 94720 USA. [Kim, Dong Wook; Gu, Sam] Qualcomm, San Diego, CA 92121 USA. RP Tu, KN (reprint author), Univ Calif Los Angeles, Dept Mat Sci & Engn, Los Angeles, CA 90095 USA. EM kntu@ucla.edu NR 17 TC 1 Z9 1 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 0569-5503 J9 ELEC COMP C PY 2015 BP 810 EP 815 PG 6 WC Computer Science, Theory & Methods; Engineering, Electrical & Electronic SC Computer Science; Engineering GA BE2YF UT WOS:000370285100124 ER PT S AU Henry, MD Young, T Hollowell, AE Eichenfield, M Olsson, RH AF Henry, M. David Young, Travis Hollowell, Andrew E. Eichenfield, Matt Olsson, Roy H., III GP IEEE TI Wafer-Level Packaging of Aluminum Nitride RF MEMS Filters SO 2015 IEEE 65TH ELECTRONIC COMPONENTS AND TECHNOLOGY CONFERENCE (ECTC) SE Electronic Components and Technology Conference LA English DT Proceedings Paper CT IEEE 65th Electronic Components and Technology Conference (ECTC) CY MAY 26-29, 2015 CL San Diego, CA SP IEEE, IEEE Components, Packaging, & Mfg Technol Soc AB Aluminum nitride (AlN) radio frequency (RF) MEMS filters utilize piezoelectric coupling for high-performance electrical filters with frequency diversity in a small form factor. Furthermore, the compatibility of AlN with CMOS fabrication makes AlN extremely attractive from a commercial standpoint. A technological hurdle has been the ability to package these suspended resonator devices at a wafer level with high yield. In this work, we describe waferlevel packaging (WLP) of AlN MEMS RF filters in an all silicon package with solder balls on nickel vanadium / gold (NiV/ Au) bond pads that are subsequently ready for flip chip bonding. For this integration scheme, we utilize a 150 mm device wafer, fabricated in a CMOS foundry, and bond at the wafer level to a cavity silicon wafer, which hermetically encapsulates each device. The cavity wafer is then uniformly plasma etched back using a deep reactive ion etcher resulting in a 100 mu m thick hermetic silicon lid encapsulating each die, balled with 250 mu m 90/ 10 Pb/ Sn solder balls and finally diced into individually packaged dies. Each die can be frequencytrimmed to an exact frequency by rapid temperature annealing the stress of the metallization layers of each resonator. The resulting technology yields a completely packaged wafer of 900 encapsulated die (14 mm(2) by 800 mu m thick) with multiple resonators and filters at various frequencies in each package. C1 [Henry, M. David; Young, Travis; Hollowell, Andrew E.; Eichenfield, Matt; Olsson, Roy H., III] Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. RP Henry, MD (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. EM mdhenry@sandia.gov NR 14 TC 1 Z9 1 U1 0 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 0569-5503 J9 ELEC COMP C PY 2015 BP 1331 EP 1337 PG 7 WC Computer Science, Theory & Methods; Engineering, Electrical & Electronic SC Computer Science; Engineering GA BE2YF UT WOS:000370285100209 ER PT S AU Riemer, BW Gallmeier, FX Dominik, LJ AF Riemer, Bernard W. Gallmeier, Franz X. Dominik, Laura J. GP IEEE TI SINGLE EVENT EFFECTS TEST FACILITY AT OAK RIDGE NATIONAL LABORATORY SO 2015 IEEE/AIAA 34TH DIGITAL AVIONICS SYSTEMS CONFERENCE (DASC) SE IEEE-AIAA Digital Avionics Systems Conference LA English DT Proceedings Paper CT IEEE/AIAA 34th Digital Avionics Systems Conference (DASC) CY SEP 13-17, 2015 CL Prague, CZECH REPUBLIC SP IEEE, AIAA, AESS, AIAA Digital Avion Tech Comm, Boeing, Honeywell, MITRE, Mosaic Atm, NASA, Avion Magazine ID AVIONICS AB Increasing use of microelectronics of ever diminishing feature size in avionics systems has led to a growing Single Event Effects (SEE) susceptibility arising from the highly ionizing interactions of cosmic rays and solar particles. Single event effects caused by atmospheric radiation have been recognized in recent years as a design issue for avionics equipment and systems. To ensure a system meets all its safety and reliability requirements, SEE induced upsets and potential system failures need to be considered, including testing of the components and systems in a neutron beam. Testing of integrated circuits (ICs) and systems for use in radiation environments requires the utilization of highly advanced laboratory facilities that can run evaluations on microcircuits for the effects of radiation. This paper provides a background of the atmospheric radiation phenomenon and the resulting single event effects, including single event upset (SEU) and latch up conditions. A study investigating requirements for future single event effect irradiation test facilities and developing options at the Spallation Neutron Source (SNS) is summarized. The relatively new SNS-with its 1.0 GeV proton beam, typical operation of 5000 h per year, expertise in spallation neutron sources, user program infrastructure, and decades of useful life ahead-is well suited for hosting a world-class SEE test facility in North America. Emphasis was put on testing of large avionics systems while still providing tunable high flux irradiation conditions for component tests. Makers of ground-based systems would also be served well by these facilities. Three options are described; the most capable, flexible, and highesttest- capacity option is a new stand-alone target station using about one kW of proton beam power on a gas-cooled tungsten target, with dual test enclosures. Less expensive options are also described. C1 [Riemer, Bernard W.; Gallmeier, Franz X.] Oak Ridge Natl Lab, Oak Ridge, TN USA. [Dominik, Laura J.] Honeywell Inc, Minneapolis, MN 55408 USA. RP Riemer, BW (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN USA. EM riemerbw@ornl.gov; gallmeierfz@ornl.gov; Laura.Dominik@honeywell.com NR 13 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2155-7195 BN 978-1-4799-8940-9 J9 IEEEAAIA DIGIT AVION PY 2015 PG 12 WC Engineering, Aerospace SC Engineering GA BE2YI UT WOS:000370294400152 ER PT S AU Riemer, B Gallmeier, F Dominik, L AF Riemer, Bernie Gallmeier, Franz Dominik, Laura GP IEEE TI Single Event Effects Test Facility Options at the Oak Ridge National Laboratory SO 2015 IEEE/AIAA 34TH DIGITAL AVIONICS SYSTEMS CONFERENCE (DASC) SE IEEE-AIAA Digital Avionics Systems Conference LA English DT Proceedings Paper CT IEEE/AIAA 34th Digital Avionics Systems Conference (DASC) CY SEP 13-17, 2015 CL Prague, CZECH REPUBLIC SP IEEE, AIAA, AESS, AIAA Digital Avion Tech Comm, Boeing, Honeywell, MITRE, Mosaic Atm, NASA, Avion Magazine C1 [Riemer, Bernie] Spallat Neutron Source, Instrument & Source Div, Oak Ridge, TN 37830 USA. [Gallmeier, Franz] SNS, Delhi, India. [Dominik, Laura] Honeywell Inc, Minneapolis, MN 55408 USA. RP Riemer, B (reprint author), Spallat Neutron Source, Instrument & Source Div, Oak Ridge, TN 37830 USA. EM riemerbw@ornl.gov NR 0 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2155-7195 BN 978-1-4799-8940-9 J9 IEEEAAIA DIGIT AVION PY 2015 PG 32 WC Engineering, Aerospace SC Engineering GA BE2YI UT WOS:000370294400308 ER PT S AU Khasawneh, HJ Mondal, A Illindala, MS Schenkman, BL Borneo, DR AF Khasawneh, Hussam J. Mondal, Abrez Illindala, Mahesh S. Schenkman, Benjamin L. Borneo, Daniel R. GP IEEE TI Evaluation and Sizing of Energy Storage Systems for Microgrids SO 2015 IEEE/IAS 51ST INDUSTRIAL & COMMERCIAL POWER SYSTEMS TECHNICAL CONFERENCE (I&CPS) SE IEEE Industrial and Commercial Power Systems and Technical Conference LA English DT Proceedings Paper CT IEEE/IAS 51st Industrial & Commercial Power Systems Technical Conference (I&CPS) CY MAY 05-08, 2015 CL Calgary, CANADA SP IEEE Ind Applicat Soc, IEEE S Alberta Sect, IEEE, IAS DE Batteries; distributed generation; advanced energy storage; microgrid; sizing; smart grid; supercapacitors ID LITHIUM-ION BATTERIES; SIMULATION; CAPACITY AB This paper evaluates the energy storage systems (ESS) in the microgrids. The ESS unit is regarded as an added energy resource in microgrid system to support the power balance when regular distributed energy resources (DERs) are incapable of matching the load demand. Sizing and specifications of ESS are investigated in this paper using several test case scenarios. An overall evaluation of the energy storage functionality is carried out for the microgrid by looking at different storage options for diverse operating scenarios. C1 [Khasawneh, Hussam J.; Mondal, Abrez; Illindala, Mahesh S.] Ohio State Univ, Elect & Comp Engn, Columbus, OH 43210 USA. [Schenkman, Benjamin L.] Sandia Natl Labs, Mil Energy & Syst Anal, Albuquerque, NM 87185 USA. [Borneo, Daniel R.] Sandia Natl Labs, Energy Storage Technol & Syst, Albuquerque, NM 87185 USA. RP Khasawneh, HJ (reprint author), Ohio State Univ, Elect & Comp Engn, Columbus, OH 43210 USA. EM h.khasawneh@ieee.org; mondal.14@osu.edu; millindala@ieee.org; blschen@sandia.gov; drborne@sandia.gov RI Illindala, Mahesh/B-2822-2013; Khasawneh, Hussam/K-2093-2015 OI Illindala, Mahesh/0000-0002-2015-1338; Khasawneh, Hussam/0000-0001-5382-305X NR 37 TC 0 Z9 0 U1 1 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2163-9604 BN 978-1-4799-8063-5 J9 IND COMMER POWER PY 2015 PG 8 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE3FO UT WOS:000370647700009 ER PT S AU Mao, DJF Khasawneh, HJ Illindala, MS Schenkman, BL Borneo, DR AF Mao, Daijiafan Khasawneh, Hussam J. Illindala, Mahesh S. Schenkman, Benjamin L. Borneo, Daniel R. GP IEEE TI Evaluation and Sizing of Energy Storage Systems for Microgrids SO 2015 IEEE/IAS 51ST INDUSTRIAL & COMMERCIAL POWER SYSTEMS TECHNICAL CONFERENCE (I&CPS) SE IEEE Industrial and Commercial Power Systems and Technical Conference LA English DT Proceedings Paper CT IEEE/IAS 51st Industrial & Commercial Power Systems Technical Conference (I&CPS) CY MAY 05-08, 2015 CL Calgary, CANADA SP IEEE Ind Applicat Soc, IEEE S Alberta Sect, IEEE, IAS DE Batteries; distributed generation; advanced energy storage; microgrid; sizing; smart grid; supercapacitors AB This paper evaluates the energy storage systems (ESS) in the microgrids. The ESS unit is regarded as an added energy resource in microgrid system to support the power balance when regular distributed energy resources (DERs) are incapable of matching the load demand. Sizing and specifications of ESS are investigated in this paper using several test case scenarios. An overall evaluation of the energy storage functionality is carried out for the microgrid by looking at different storage options for diverse operating scenarios. C1 [Mao, Daijiafan; Khasawneh, Hussam J.; Illindala, Mahesh S.] Ohio State Univ, Elect & Comp Engn, Columbus, OH 43210 USA. [Schenkman, Benjamin L.] Sandia Natl Labs, Mil Energy & Syst Anal, Albuquerque, NM 87185 USA. [Borneo, Daniel R.] Sandia Natl Labs, Energy Storage Technol & Syst, Albuquerque, NM 87185 USA. RP Mao, DJF (reprint author), Ohio State Univ, Elect & Comp Engn, Columbus, OH 43210 USA. EM d.mao.1990@ieee.org; h.khasawneh@ieee.org; millindala@ieee.org; blschen@sandia.gov; drborne@sandia.gov RI Illindala, Mahesh/B-2822-2013; Khasawneh, Hussam/K-2093-2015 OI Illindala, Mahesh/0000-0002-2015-1338; Khasawneh, Hussam/0000-0001-5382-305X NR 23 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 2163-9604 BN 978-1-4799-8063-5 J9 IND COMMER POWER PY 2015 PG 7 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE3FO UT WOS:000370647700008 ER PT S AU Schwindt, PDD Jau, YY Partner, HL Serkland, DK Ison, A McCants, A Winrow, E Boschen, CD Kosvin, I Mailloux, D Scherer, D Prestage, J Kellogg, J Yu, N Nelson, C Hati, A Howe, DA AF Schwindt, Peter D. D. Jau, Yuan-Yu Partner, Heather L. Serkland, Darwin K. Ison, Aaron McCants, Andrew Winrow, Edward Boschen, C. Daniel Kosvin, Igor Mailloux, David Scherer, David Prestage, John Kellogg, James Yu, Nan Nelson, Craig Hati, Archita Howe, David A. GP IEEE TI Miniature Trapped-Ion Frequency Standard with Yb-171(+) SO 2015 JOINT CONFERENCE OF THE IEEE INTERNATIONAL FREQUENCY CONTROL SYMPOSIUM & THE EUROPEAN FREQUENCY AND TIME FORUM (FCS) SE IEEE International Frequency Control Symposium LA English DT Proceedings Paper CT Joint Conference of the IEEE International Frequency Control Symposium / European Frequency and Time Forum (FCS) CY APR 12-16, 2015 CL Denver, CO SP IEEE, UFFC, EFTF DE atomic clock; trapped ions ID ALLAN DEVIATION; ATOMIC CLOCK; THEOH AB We describe the development and frequency instability measurements of a highly miniaturized, buffer gas cooled, trapped-ion atomic clock. The clock utilizes the 12.6 GHz hyperfine transition of the Yb-171(+) ion. A custom-built 3 cm(3) vacuum package containing the ion trap is integrated with other key elements of the atomic frequency standard, including a photo multiplier tube, miniaturized laser sources at 369 nm and 935 nm, a local oscillator, and control electronics. With the clock physics package assembled on a 10 cm x 15 cm breadboard, the long-term fractional frequency instability was measured to be 6 x 10(-14) at 25 days of integration. Later, the clock physics package was further miniaturized, and the frequency instability was measured to be 2 x 10(-11)/tau(1/2) at integration times up to 10,000 s. C1 [Schwindt, Peter D. D.; Jau, Yuan-Yu; Partner, Heather L.; Serkland, Darwin K.; Ison, Aaron; McCants, Andrew; Winrow, Edward] Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. [Boschen, C. Daniel; Kosvin, Igor; Mailloux, David; Scherer, David] Microsemi Inc, Beverly, MA USA. [Prestage, John; Kellogg, James; Yu, Nan] CALTECH, Jet Prop Lab, Pasadena, CA USA. [Nelson, Craig; Hati, Archita; Howe, David A.] NIST, Boulder, CO USA. RP Schwindt, PDD (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. EM pschwin@sandia.gov NR 10 TC 0 Z9 0 U1 11 U2 12 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1075-6787 BN 978-1-4799-8866-2 J9 P IEEE INT FREQ CONT PY 2015 BP 752 EP 757 PG 6 WC Engineering, Electrical & Electronic; Physics, Applied; Telecommunications SC Engineering; Physics; Telecommunications GA BE3DU UT WOS:000370553200167 ER PT S AU Kwon, KD Sposito, G AF Kwon, Kideok D. Sposito, Garrison BE Feng, X Li, W Zhu, M Sparks, DL TI Mechanistic Understanding of Metal Sorption by Phyllomanganates through Density Functional Theory SO ADVANCES IN THE ENVIRONMENTAL BIOGEOCHEMISTRY OF MANGANESE OXIDES SE ACS Symposium Series LA English DT Proceedings Paper CT Symposium on Advances in Understanding the Environmental Geochemistry of Manganese (Mn) Oxides / 247th American-Chemical-Society National Meeting CY MAR 16-20, 2014 CL Dallas, TX SP Amer Chem Soc, Div Geochemistry ID X-RAY-DIFFRACTION; BIRNESSITE NANOPARTICLES; SURFACE COMPLEXATION; SORBED BIRNESSITE; CHALCOPHANITE; ABSORPTION; TRANSITION; CRYSTAL; PB(II); OXIDES AB The sorption processes of phyllomanganates (layer type Mn oxides) greatly impact the geochemical cycles of metals in environments ranging from the ocean floor to the land surface. In situ spectroscopy has provided valuable insights into the underlying sorption mechanisms on these minerals by identifying molecular-level surface species of trace metals. Accurate determination of metal surface speciation is challenging, however, because of ambiguities often encountered in attempting to interpret the spectra. Adding complexity to these issues, certain experimentally observed trends in metal sorption cannot be explained simply by invoking conventional chemical effects, such as differences in ionic radii or crystal field energies. Geometry optimizations performed using density functional theory, a first-principles approach based in quantum mechanics, can help to resolve these problems by providing highly detailed information about the structure, energetics, and electronic properties of both minerals and metal surface complexes, thus serving as a complementary approach to surface spectroscopy in elucidating sorption mechanisms. This chapter reviews recent applications of density functional theory which illustrate how it accomplishes this goal. C1 [Kwon, Kideok D.] Kangwon Natl Univ, Dept Geol, Chunchon 200701, South Korea. [Sposito, Garrison] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Dept Geochem, Div Earth Sci, Berkeley, CA 94720 USA. RP Kwon, KD (reprint author), Kangwon Natl Univ, Dept Geol, Chunchon 200701, South Korea. EM kkwon@kangwon.ac.kr NR 40 TC 0 Z9 0 U1 2 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 SIXTEENTH ST NW, WASHINGTON, DC 20036 USA SN 0097-6156 BN 978-0-8412-3096-5 J9 ACS SYM SER JI ACS Symp. Ser. PY 2015 VL 1197 BP 51 EP 64 PG 14 WC Geochemistry & Geophysics; Environmental Sciences SC Geochemistry & Geophysics; Environmental Sciences & Ecology GA BE3NO UT WOS:000371003600003 ER PT S AU Church, RL Niblett, MR O'Hanley, J Middleton, R Barber, K AF Church, Richard L. Niblett, Matthew R. O'Hanley, Jesse Middleton, Richard Barber, Klaus BE Eiselt, HA Marianov, V TI Saving the Forest by Reducing Fire Severity: Selective Fuels Treatment Location and Scheduling SO APPLICATIONS OF LOCATION ANALYSIS SE International Series in Operations Research & Management Science LA English DT Article; Book Chapter ID SEARCH C1 [Church, Richard L.; Niblett, Matthew R.] Univ Calif Santa Barbara, 1832 Ellison Hall, Santa Barbara, CA 93106 USA. [O'Hanley, Jesse] Univ Kent, Kent Business Sch, Canterbury, Kent, England. [Middleton, Richard] Los Alamos Natl Lab, Los Alamos, NM USA. [Barber, Klaus] US Forest Serv, Vallejo, CA USA. RP Church, RL (reprint author), Univ Calif Santa Barbara, 1832 Ellison Hall, Santa Barbara, CA 93106 USA. EM church@geog.ucsb.edu; mniblett@geog.ucsb.edu; J.Ohanley@kent.ac.uk; rsm@lanl.gov; 4khbarber@gmail.com NR 19 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER PI NEW YORK PA 233 SPRING STREET, NEW YORK, NY 10013, UNITED STATES SN 0884-8289 BN 978-3-319-20282-2; 978-3-319-20281-5 J9 INT SER OPER RES MAN PY 2015 VL 232 BP 173 EP 190 DI 10.1007/978-3-319-20282-2_7 D2 10.1007/978-3-319-20282-2 PG 18 WC Management; Operations Research & Management Science SC Business & Economics; Operations Research & Management Science GA BE1LA UT WOS:000368096100008 ER PT S AU Schmid, EM Richmond, DL Fletcher, DA AF Schmid, Eva M. Richmond, David L. Fletcher, Daniel A. BE Ross, J Marshall, WF TI Reconstitution of proteins on electroformed giant unilamellar vesicles SO BUILDING A CELL FROM ITS COMPONENT PARTS SE Methods in Cell Biology LA English DT Review; Book Chapter ID IN-VITRO; MEMBRANE CURVATURE; SELF-ORGANIZATION; LIPID-BILAYERS; POLYMERIZATION; TRANSFORMATION; MICROTUBULES; MICROSCOPY; MONOLAYERS; DIFFUSION AB In vitro reconstitution of simplified biological systems from molecular parts has proven to be a powerful method for investigating the biochemical and biophysical principles underlying cellular processes. In recent years, there has been a growing interest in reconstitution of protein-membrane interactions to understand the critical role played by membranes in organizing molecular-scale events into micron-scale patterns and protrusions. However, while all reconstitution experiments depend on identifying and isolating an essential set of soluble biomolecules, such as proteins, DNA, and RNA, reconstitution of membrane-based processes involves the additional challenge of forming and working with lipid bilayer membranes with composition, fluidity, and mechanical properties appropriate for the process at hand. Here we discuss a selection of methods for forming synthetic lipid bilayer membranes and present a versatile electroformation protocol that our lab uses for reconstituting proteins on giant unilamellar vesicles. This synthetic membrane-based approach to reconstitution offers the ability to study protein organization and activity at membranes under more cell-like conditions, addressing a central challenge to accomplishing the grand goal of "building the cell." C1 [Schmid, Eva M.; Fletcher, Daniel A.] Univ Calif Berkeley, Dept Bioengn, Berkeley, CA 94720 USA. [Schmid, Eva M.; Fletcher, Daniel A.] Univ Calif Berkeley, Biophys Program, Berkeley, CA 94720 USA. [Richmond, David L.] Max Planck Inst Mol Cell Biol & Genet, Dresden, Germany. [Fletcher, Daniel A.] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Phys Biosci, Berkeley, CA 94720 USA. RP Fletcher, DA (reprint author), Univ Calif Berkeley, Dept Bioengn, Berkeley, CA 94720 USA. EM fletch@berkeley.edu NR 44 TC 3 Z9 3 U1 4 U2 22 PU ELSEVIER ACADEMIC PRESS INC PI SAN DIEGO PA 525 B STREET, SUITE 1900, SAN DIEGO, CA 92101-4495 USA SN 0091-679X BN 978-0-12-802450-8 J9 METHOD CELL BIOL JI Methods Cell Biol. PY 2015 VL 128 BP 319 EP 338 DI 10.1016/bs.mcb.2015.02.004 PG 20 WC Cell Biology SC Cell Biology GA BE3BW UT WOS:000370490800018 PM 25997355 ER PT S AU Liu, Z Ukida, H Niel, K Ramuhalli, P AF Liu, Zheng Ukida, Hiroyuki Niel, Kurt Ramuhalli, Pradeep BE Liu, Z Ukida, H Ramuhalli, P Niel, K TI Industrial Inspection with Open Eyes: Advance with Machine Vision Technology SO INTEGRATED IMAGING AND VISION TECHNIQUES FOR INDUSTRIAL INSPECTION: ADVANCES AND APPLICATIONS SE Advances in Computer Vision and Pattern Recognition LA English DT Article; Book Chapter ID OF-THE-ART; SURFACE-DEFECTS; INFRARED THERMOGRAPHY; AUTOMATIC INSPECTION; VISUAL INSPECTION; COMPUTER VISION; SYSTEM; QUALITY; DEFORMATION; COMPONENTS AB Machine vision systems have evolved significantly with the technology advances to tackle the challenges from modern manufacturing industry. A wide range of industrial inspection applications for quality control are benefiting from visual information captured by different types of cameras variously configured in a machine vision system. This chapter screens the state of the art in machine vision technologies in the light of hardware, software tools, and major algorithm advances for industrial inspection. The inspection beyond visual spectrum offers a significant complementary to the visual inspection. The combination with multiple technologies makes it possible for the inspection to achieve a better performance and efficiency in varied applications. The diversity of the applications demonstrates the great potential of machine vision systems for industry. C1 [Liu, Zheng] Univ British Columbia Okanagan, Kelowna, BC, Canada. [Ukida, Hiroyuki] Univ Tokushima, Tokushida, Japan. [Niel, Kurt] Univ Appl Sci Upper Austria, Wels, Austria. [Ramuhalli, Pradeep] Pacific NW Natl Lab, Richland, WA 99352 USA. RP Liu, Z (reprint author), Univ British Columbia Okanagan, Kelowna, BC, Canada. EM zheng.liu@ieee.org; ukida@tokushima-u.ac.jp; kurt.niel@fh-wels.at; pradeep.ramuhalli@pnnl.gov OI Ramuhalli, Pradeep/0000-0001-6372-1743; Liu, Zheng/0000-0002-7241-3483 NR 135 TC 9 Z9 9 U1 1 U2 1 PU SPRINGER-VERLAG LONDON LTD PI GODALMING PA SWEETAPPLE HOUSE CATTESHALL RD FARNCOMBE, GODALMING GU7 1NH, SURREY, ENGLAND SN 2191-6586 BN 978-1-4471-6741-9; 978-1-4471-6740-2 J9 ADV COMPUT VIS PATT PY 2015 BP 1 EP 37 DI 10.1007/978-1-4471-6741-9_1 D2 10.1007/978-1-4471-6741-9 PG 37 WC Computer Science, Artificial Intelligence SC Computer Science GA BE1LY UT WOS:000368110500002 ER PT S AU Crawford, SL Anderson, MT Diaz, AA Larche, MR Prowant, MS Cinson, AD AF Crawford, Susan L. Anderson, Michael T. Diaz, Aaron A. Larche, Michael R. Prowant, Matthew S. Cinson, Anthony D. BE Liu, Z Ukida, H Ramuhalli, P Niel, K TI Ultrasonic Evaluation and Imaging SO INTEGRATED IMAGING AND VISION TECHNIQUES FOR INDUSTRIAL INSPECTION: ADVANCES AND APPLICATIONS SE Advances in Computer Vision and Pattern Recognition LA English DT Article; Book Chapter AB Ultrasonic evaluation of materials for material characterization and flaw detection is as simple as manually moving a single-element probe across a specimen and looking at an oscilloscope display in real time or as complex as automatically (under computer control) scanning a phased-array probe across a specimen and collecting encoded data for immediate or off-line data analyses. The reliability of the results in the second technique is greatly increased because of a higher density of measurements per scanned area and measurements that can be more precisely related to the specimen geometry. This chapter will briefly discuss applications of the collection of spatially encoded data and focus primarily on the off-line analyses in the form of data imaging. Pacific Northwest National Laboratory (PNNL) has been involved with assessing and advancing the reliability of inservice inspections of nuclear power plant components for over 35 years. Modern ultrasonic imaging techniques such as the synthetic aperture focusing technique (SAFT), phased-array (PA) technology, and sound field mapping have undergone considerable improvements to effectively assess and better understand material constraints. C1 [Crawford, Susan L.; Anderson, Michael T.; Diaz, Aaron A.; Larche, Michael R.; Prowant, Matthew S.] PNNL, Richland, WA USA. [Cinson, Anthony D.] NRC, Washington, DC USA. RP Crawford, SL (reprint author), PNNL, Richland, WA USA. EM Susan.Crawford@pnnl.gov NR 16 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER-VERLAG LONDON LTD PI GODALMING PA SWEETAPPLE HOUSE CATTESHALL RD FARNCOMBE, GODALMING GU7 1NH, SURREY, ENGLAND SN 2191-6586 BN 978-1-4471-6741-9; 978-1-4471-6740-2 J9 ADV COMPUT VIS PATT PY 2015 BP 393 EP 412 DI 10.1007/978-1-4471-6741-9_13 D2 10.1007/978-1-4471-6741-9 PG 20 WC Computer Science, Artificial Intelligence SC Computer Science GA BE1LY UT WOS:000368110500014 ER PT S AU Kisyov, S Negoita, F Gugiu, MM Higginson, DP Vassura, L Borghesi, M Bernstein, L Bleuel, DL Gobet, F Goldblum, BL Green, A Hannachi, F Kar, S Petrascu, H Pietreanu, D Quentin, L Schroer, AM Tarisien, M Versteegen, M Willi, O Antici, P Fuchs, J AF Kisyov, S. Negoita, F. Gugiu, M. M. Higginson, D. P. Vassura, L. Borghesi, M. Bernstein, L. Bleuel, D. L. Gobet, F. Goldblum, B. L. Green, A. Hannachi, F. Kar, S. Petrascu, H. Pietreanu, D. Quentin, L. Schroer, A. -M. Tarisien, M. Versteegen, M. Willi, O. Antici, P. Fuchs, J. BE Budde, M Gillespie, A Jarque, EC Lecesne, N Welsch, CP TI Time of Flight Measurements for Neutrons Produced in Reactions Driven by Laser-Target Interactions at Petawatt level SO INTERNATIONAL CONFERENCE ON LASER APPLICATIONS AT ACCELERATORS, LANET 2015 SE Physics Procedia LA English DT Proceedings Paper CT International Conference on Laser Applications at Accelerators (LA3NET) CY MAR 25-27, 2015 CL Mallorca, SPAIN SP Univ Liverpool, Cockcroft Inst, EU Project T E A M DE simulations; neutron detection; TNSA; intense neutron flux AB Short intense pulses of fast neutrons were produced in a two stage laser-driven experiment. Protons were accelerated by means of the Target Normal Sheath Acceleration (TNSA) method using the TITAN facility at the Lawrence Livermore National Laboratory. Neutrons were obtained following interactions of the protons with a secondary lithium fluoride (LiF) target. The properties of the neutron flux were studied using BC-400 plastic scintillation detectors and the neutron time of flight (nTOF) technique. The detector setup and the experimental conditions were simulated with the Geant4 toolkit. The effects of different components of the experimental setup on the nTOF were studied. Preliminary results from a comparison between experimental and simulated nTOF distributions are presented. (C) 2015 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). C1 [Kisyov, S.; Negoita, F.; Gugiu, M. M.; Petrascu, H.; Pietreanu, D.] Horia Hulubei Natl Inst R&D Phys & Nucl Engn IFIN, POB MG 6, Bucharest, Romania. [Kisyov, S.] Univ Sofia, Fac Phys, Atom Phys Dept, Sofia 1164, Bulgaria. [Higginson, D. P.; Vassura, L.; Quentin, L.; Fuchs, J.] Univ Paris 06, Ecole Polytech, Lab Utilisat Lasers Intenses, CNRS,CEA,UMR 7605, F-91128 Palaiseau, France. [Borghesi, M.; Green, A.; Kar, S.] Queens Univ Belfast, Belfast BT7 1NN, Antrim, North Ireland. [Bernstein, L.; Bleuel, D. L.] Lawrence Livermore Natl Lab, Livermore, CA 94440 USA. [Gobet, F.; Hannachi, F.; Tarisien, M.] Univ Bordeaux, Ctr Etud Nucl Bordeaux Gradignam, CNRS, IN2P3, F-33175 Gradignan, France. [Goldblum, B. L.] Univ Calif Berkeley, Dept Nucl Engn, Berkeley, CA 94720 USA. [Schroer, A. -M.; Willi, O.] Univ Dusseldorf, Inst Laser & Plasmaphys, D-40225 Dusseldorf, Germany. [Antici, P.] INRS EMT, Varennes, PQ, Canada. RP Kisyov, S (reprint author), Horia Hulubei Natl Inst R&D Phys & Nucl Engn IFIN, POB MG 6, Bucharest, Romania. EM stanimir.kisyov@nipne.ro RI Kar, Satyabrata/E-5220-2010; Higginson, Drew/G-5942-2016 OI Higginson, Drew/0000-0002-7699-3788 NR 10 TC 0 Z9 0 U1 3 U2 8 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA SARA BURGERHARTSTRAAT 25, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 1875-3892 J9 PHYSCS PROC PY 2015 VL 77 BP 29 EP 33 DI 10.1016/j.phpro.2015.11.006 PG 5 WC Physics, Applied SC Physics GA BE3KM UT WOS:000370876100006 ER PT S AU Wing, S Johnson, JR AF Wing, Simon Johnson, Jay R. BE Keiling, A Jackman, CM Delamere, PA TI Solar Wind Entry Into and Transport Within Planetary Magnetotails SO MAGNETOTAILS IN THE SOLAR SYSTEM SE Geophysical Monograph Book Series LA English DT Article; Book Chapter ID INTERPLANETARY MAGNETIC-FIELD; KELVIN-HELMHOLTZ INSTABILITY; LATITUDE BOUNDARY-LAYER; KINETIC ALFVEN WAVES; DAWN-DUSK ASYMMETRIES; GLOBAL MHD SIMULATION; PLASMA SHEET MATERIAL; GEOTAIL OBSERVATIONS; NORTHWARD IMF; GEOSYNCHRONOUS ORBIT C1 [Wing, Simon] Johns Hopkins Univ, Appl Phys Lab, Laurel, MD USA. [Johnson, Jay R.] Princeton Univ, Princeton Plasma Phys Lab, Princeton, NJ 08543 USA. RP Wing, S (reprint author), Johns Hopkins Univ, Appl Phys Lab, Laurel, MD USA. NR 176 TC 0 Z9 0 U1 0 U2 0 PU BLACKWELL SCIENCE PUBL PI OXFORD PA OSNEY MEAD, OXFORD OX2 0EL, ENGLAND SN 0065-8448 BN 978-1-118-84232-4; 978-1-118-84234-8 J9 GEOPHYS MONOGR SER PY 2015 VL 207 BP 235 EP 258 D2 10.1002/9781118842324 PG 24 WC Astronomy & Astrophysics; Geochemistry & Geophysics SC Astronomy & Astrophysics; Geochemistry & Geophysics GA BE2BK UT WOS:000368913000015 ER PT S AU Hesse, M Aunai, N Kuznetsova, M Zenitani, S Birn, J AF Hesse, Michael Aunai, Nicolas Kuznetsova, Masha Zenitani, Seiji Birn, Joachim BE Keiling, A Jackman, CM Delamere, PA TI Magnetic Reconnection in Different Environments: Similarities and Differences SO MAGNETOTAILS IN THE SOLAR SYSTEM SE Geophysical Monograph Book Series LA English DT Article; Book Chapter ID FIELD; MAGNETOPAUSE; SIMULATIONS; MODEL C1 [Hesse, Michael; Aunai, Nicolas; Kuznetsova, Masha] NASA, Goddard Space Flight Ctr, Heliophys Sci Div, Greenbelt, MD USA. [Zenitani, Seiji] Natl Astron Observ Japan, Tokyo, Japan. [Birn, Joachim] Los Alamos Natl Lab, Los Alamos, NM USA. [Birn, Joachim] Space Sci Inst, Boulder, CO USA. RP Hesse, M (reprint author), NASA, Goddard Space Flight Ctr, Heliophys Sci Div, Greenbelt, MD USA. NR 32 TC 0 Z9 0 U1 1 U2 1 PU BLACKWELL SCIENCE PUBL PI OXFORD PA OSNEY MEAD, OXFORD OX2 0EL, ENGLAND SN 0065-8448 BN 978-1-118-84232-4; 978-1-118-84234-8 J9 GEOPHYS MONOGR SER PY 2015 VL 207 BP 259 EP 267 D2 10.1002/9781118842324 PG 9 WC Astronomy & Astrophysics; Geochemistry & Geophysics SC Astronomy & Astrophysics; Geochemistry & Geophysics GA BE2BK UT WOS:000368913000016 ER PT S AU Reeves, GD AF Reeves, Geoffrey D. BE Keiling, A Jackman, CM Delamere, PA TI Radiation Belt Electron Acceleration and Role of Magnetotail SO MAGNETOTAILS IN THE SOLAR SYSTEM SE Geophysical Monograph Book Series LA English DT Article; Book Chapter ID PHASE-SPACE DENSITY; WAVE-PARTICLE INTERACTIONS; RELATIVISTIC ELECTRONS; GEOMAGNETIC STORMS; VAN-ALLEN; INNER MAGNETOSPHERE; EARTHS INNER; MECHANISMS; SATELLITES; CHORUS C1 [Reeves, Geoffrey D.] Los Alamos Natl Lab, Space Sci & Applicat Grp, Los Alamos, NM USA. RP Reeves, GD (reprint author), Los Alamos Natl Lab, Space Sci & Applicat Grp, Los Alamos, NM USA. NR 75 TC 1 Z9 1 U1 0 U2 0 PU BLACKWELL SCIENCE PUBL PI OXFORD PA OSNEY MEAD, OXFORD OX2 0EL, ENGLAND SN 0065-8448 BN 978-1-118-84232-4; 978-1-118-84234-8 J9 GEOPHYS MONOGR SER PY 2015 VL 207 BP 345 EP 359 D2 10.1002/9781118842324 PG 15 WC Astronomy & Astrophysics; Geochemistry & Geophysics SC Astronomy & Astrophysics; Geochemistry & Geophysics GA BE2BK UT WOS:000368913000021 ER PT J AU Planes, A Stern-Taulats, E Castan, T Vives, E Manosa, L Saxena, A AF Planes, A. Stern-Taulats, E. Castan, T. Vives, E. Manosa, L. Saxena, A. TI Caloric and multicaloric effects in shape memory alloys SO MATERIALS TODAY-PROCEEDINGS LA English DT Proceedings Paper CT 14th International Conference on Martensitic Transformations (ICOMAT) CY JUL 06-11, 2014 CL Bilbao, SPAIN SP Univ Basque Country UPV EHU DE Magnetic shape memory alloys; Heusler; magnetocaloric effect; multicaloric effects; martensitic transition ID NI-MN-SN; ENTROPY CHANGE; TRANSITIONS AB Caloric properties rely on the reversible thermal response of a given material to changes induced by an applied field. In magnetic shape-memory materials, thanks to a strong interplay between magnetism and structure, caloric effects can be induced by application of both magnetic and mechanical (stress) fields. The study of such effects is an expanding field of research opening novel opportunities in solid state refrigeration and energy harvesting applications. In this paper we present an overview of the present state of the art of the subject. After a brief discussion of the thermodynamics of systems with magneto-structural interplay, we survey the caloric and multicaloric properties of NiMn-based Heusler materials. The conditions required for optimal caloric efficiency in cycling processes are considered. Finally, we outline some present challenges and future perspectives in this topic. (C) 2015 Elsevier Ltd. C1 [Planes, A.; Stern-Taulats, E.; Castan, T.; Vives, E.; Manosa, L.] Univ Barcelona, Dept Estruct & Constituents Mat, Diagonal 645, E-08028 Barcelona, Catalonia, Spain. [Saxena, A.] Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. RP Planes, A (reprint author), Univ Barcelona, Dept Estruct & Constituents Mat, Diagonal 645, E-08028 Barcelona, Catalonia, Spain. EM toni@ecm.ub.edu RI Vives, Eduard/I-4821-2014; OI Vives, Eduard/0000-0002-5916-7214; Manosa, Lluis/0000-0002-1182-2670 NR 37 TC 0 Z9 0 U1 5 U2 18 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 2214-7853 J9 MATER TODAY-PROC JI Mater. Today-Proc. PY 2015 VL 2 SU 3 BP 477 EP 484 DI 10.1016/j.matpr.2015.07.332 PG 8 GA DF0MB UT WOS:000371032100002 ER PT J AU Isaeva, L Hellman, O Lashley, JC Abrikosov, IA Eriksson, O AF Isaeva, L. Hellman, O. Lashley, J. C. Abrikosov, I. A. Eriksson, O. TI Dynamic stabilization of cubic AuZn SO MATERIALS TODAY-PROCEEDINGS LA English DT Proceedings Paper CT 14th International Conference on Martensitic Transformations (ICOMAT) CY JUL 06-11, 2014 CL Bilbao, SPAIN SP Univ Basque Country UPV EHU DE Lattice dynamics; anharmonicity; shape-memory alloys ID TOTAL-ENERGY CALCULATIONS; AUGMENTED-WAVE METHOD; MARTENSITIC-TRANSFORMATION; NEUTRON-SCATTERING; BASIS-SET; ALLOYS; METALS AB A recently developed temperature-dependent effective potential method is employed to study the martensitic phase transformation in AuZn. This method is based on ab initio molecular dynamics and allows to obtain finite-temperature lattice vibrational properties. We show that the transversal acoustic TA(2)[110] mode associated with the phase transition is stabilized at 300 K. Temperature evolution of single-phonon dynamic structure factor at the wave vector q= 1/3[1,1,0], associated with phonon softening and Fermi surface nesting, was also studied. (C) 2015 The Authors. Published by Elsevier Ltd. C1 [Isaeva, L.; Eriksson, O.] Uppsala Univ, Dept Phys & Astron, Div Mat Theory, POB 516, S-75120 Uppsala, Sweden. [Hellman, O.; Abrikosov, I. A.] Linkoping Univ, Dept Phys Chem & Biol IFM, SE-58183 Linkoping, Sweden. [Hellman, O.] CALTECH, Dept Appl Phys & Mat Sci, Pasadena, CA 91125 USA. [Lashley, J. C.] Los Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USA. RP Isaeva, L (reprint author), Uppsala Univ, Dept Phys & Astron, Div Mat Theory, POB 516, S-75120 Uppsala, Sweden. EM leyla.isaeva@physics.uu.se OI Hellman, Olle/0000-0002-3453-2975 NR 25 TC 0 Z9 0 U1 1 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 2214-7853 J9 MATER TODAY-PROC JI Mater. Today-Proc. PY 2015 VL 2 SU 3 BP 569 EP 572 DI 10.1016/j.matpr.2015.07.349 PG 4 GA DF0MB UT WOS:000371032100019 ER PT J AU Ari-Gur, P Garlea, VO Cao, H Ge, Y Aaltio, I Hannula, SP Koledov, V AF Ari-Gur, P. Garlea, V. O. Cao, H. Ge, Y. Aaltio, I. Hannula, S. P. Koledov, V. TI Neutron diffraction study of the martensitic transformation and chemical order in Heusler alloy Ni1.91Mn1.29Ga0.8 SO MATERIALS TODAY-PROCEEDINGS LA English DT Proceedings Paper CT 14th International Conference on Martensitic Transformations (ICOMAT) CY JUL 06-11, 2014 CL Bilbao, SPAIN SP Univ Basque Country UPV EHU DE Chemical Order; Ni-Mn-Ga alloy; Magnetic Shape Memory; Neutron Diffraction; Rietveld Method; Structure Refinement AB Heusler alloys of Ni-Mn-Ga compositions demonstrate ferromagnetic shape memory effect in the martensitic state. The transformation temperature and the chemical order depend strongly on the composition. In the current work, the structure and chemical order of the martensitic phase of Ni1.91Mn1.29Ga0.8 were studied using neutron diffraction; the diffraction pattern was refined using the FullProf software. It was determined that the structural transition occurs around 330 K. At room temperature, 300 K, which is below the martensite transformation temperature, all the Bragg reflections can be described by a monoclinic lattice with a symmetry of space group P 1 2/m 1 and lattice constants of a = 4.23047(7) [angstrom], b = 5.58333(6) [angstrom], c = 21.0179(2) [angstrom], beta = 90.328(1). The chemical order is of critical importance in these alloys, and it was previously studied at 363 K. Analysis of the neutron diffraction in the monoclinic phase shows that the chemical order is maintained during the martensitic transformation. (C) 2015 The Authors. Published by Elsevier Ltd. C1 [Ari-Gur, P.] Western Michigan Univ, Kalamazoo, MI 49008 USA. [Garlea, V. O.; Cao, H.] Oak Ridge Natl Lab, Quantum Condensed Matter Div, Oak Ridge, TN USA. [Ge, Y.; Aaltio, I.; Hannula, S. P.] Aalto Univ, Dept Mat Sci & Engn, Sch Chem Technol, Espoo, Finland. [Koledov, V.] RAS, Kotelnikov Inst Radio Engn & Elect, Moscow 117901, Russia. RP Ari-Gur, P (reprint author), Western Michigan Univ, Kalamazoo, MI 49008 USA. EM pnina.ari-gur@wmich.edu RI Aaltio, Ilkka/C-6170-2008; Ge, Yanling/F-9030-2012; Hannula, Simo-Pekka/G-2889-2012 OI Aaltio, Ilkka/0000-0002-8759-0693; Ge, Yanling/0000-0002-0142-4783; Hannula, Simo-Pekka/0000-0001-6247-0727 NR 7 TC 0 Z9 0 U1 2 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 2214-7853 J9 MATER TODAY-PROC JI Mater. Today-Proc. PY 2015 VL 2 SU 3 BP 853 EP 857 DI 10.1016/j.matpr.2015.07.416 PG 5 GA DF0MB UT WOS:000371032100086 ER PT S AU Raty, JY Otjacques, C Pekoz, R Lordi, V Bichara, C AF Raty, Jean-Yves Otjacques, Celine Pekoez, Rengin Lordi, Vincenzo Bichara, Christophe BE Massobrio, C Du, J Bernasconi, M Salmon, PS TI Amorphous Phase Change Materials: Structure, Stability and Relation with Their Crystalline Phase SO MOLECULAR DYNAMICS SIMULATIONS OF DISORDERED MATERIALS: FROM NETWORK GLASSES TO PHASE-CHANGE MEMORY ALLOYS SE Springer Series in Materials Science LA English DT Article; Book Chapter ID X-RAY-ABSORPTION; FINE-STRUCTURE; RANGE ORDER; ALLOYS; SIMULATION; NUCLEATION; SOLIDS AB Phase Change Materials should be stable enough in their amorphous phase to achieve a durable data retention, however they should also be bad glass formers to be able to recrystallise at high speed. To understand these contradicting properties, we construct models of amorphous Ge-Sb-Te systems using Ab Initio Molecular Dynamics and analyse the structures in relation with the relevant crystalline state. We show that structural patterns that are precursors of the crystalline phase exist in the amorphous state and we identify the signature of the various types of local atomic orders in the X-ray absorption spectra that we compute using Density Functional Theory. We first analyse the mechanical properties of the amorphous phase in the framework of the Maxwell rigidity theory, showing that all efficient Phase Change Materials deviate from the perfect glass and are mechanically stressed-rigid. Additionally, we show that the stability of Phase Change Materials is related to the density of low frequency vibrational modes (Boson peak). We describe howan adequate doping can result in an increased stability of the amorphous phase while keeping intact the phase change ability of the material. C1 [Raty, Jean-Yves; Otjacques, Celine] Univ Liege, Phys Solids Interfaces & Nanostruct, B5 Sart Tilman, B-4000 Liege, Belgium. [Pekoez, Rengin] Max Planck Inst Polymer Res, D-55128 Mainz, Germany. [Lordi, Vincenzo] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. [Bichara, Christophe] Univ Aix Marseille, CNRS, CINAM, F-13288 Marseille 9, France. RP Raty, JY (reprint author), Univ Liege, Phys Solids Interfaces & Nanostruct, B5 Sart Tilman, B-4000 Liege, Belgium. EM jyraty@ulg.ac.be; cotjac@ulg.ac.be; pekoez@mpip-mainz.mpg.de; vlordi@llnl.gov; xtof@cinam.univ-mrs.fr OI Lordi, Vincenzo/0000-0003-2415-4656 NR 63 TC 0 Z9 0 U1 0 U2 1 PU SPRINGER-VERLAG BERLIN PI BERLIN PA HEIDELBERGER PLATZ 3, D-14197 BERLIN, GERMANY SN 0933-033X BN 978-3-319-15675-0; 978-3-319-15674-3 J9 SPRINGER SER MATER S PY 2015 VL 215 BP 485 EP 509 DI 10.1007/978-3-319-15675-0_18 D2 10.1007/978-3-319-15675-0 PG 25 WC Materials Science, Multidisciplinary; Mathematics, Applied SC Materials Science; Mathematics GA BE1HM UT WOS:000367912000019 ER PT S AU Embry, K Hengartner-Cuellar, A Ross, H Mascarenas, D AF Embry, Kyle Hengartner-Cuellar, Andrea Ross, Hannah Mascarenas, David BE Sit, EW TI A Virtual Reality Glovebox with Dynamic Safety Modeling for Improved Criticality Regulation Visualization SO SENSORS AND INSTRUMENTATION, VOL 5 SE Conference Proceedings of the Society for Experimental Mechanics Series LA English DT Proceedings Paper CT 33rd IMAC Conference and Exposition on Structural Dynamics CY FEB 02-05, 2015 CL Orlando, FL SP IMAC, Soc Experimental Mech DE Glovebox; Augmented reality; Virtual reality; 3D sensing; Nuclear criticality safety AB Technicians working in gloveboxes must vigilantly keep track of the locations of the radioactive materials they work with in order to make sure they do not inadvertently perform an action that can lead to a technical criticality safety violation. The administrative consequences of these mistakes can result in halting work in a facility and can be costly. The process currently used to ensure safe operations requires every two technicians to be monitored and documented by a third technician, thus resulting in large overhead costs. This work aims to help reduce the possibility of incurring an administrative criticality violation by tracking the dynamics of nuclear materials located inside a glovebox. Emerging technologies in sensing and virtual/augmented reality were combined with knowledge of nuclear criticality regulations to create a prototype Interactive ElectronicWork Control System. Visual and depth sensors are used to detect the dynamically changing location of fissile materials in a glovebox during simulated working conditions. These measurements are then fed into a representative criticality safety model to determine appropriate separation distances between different materials. A visual depiction of these models is overlaid on representations of physical objects using virtual reality technologies to enhance the operator's perception of criticality safety regulations. C1 [Embry, Kyle] Missouri Univ Sci & Technol, Dept Mech Engn, Rolla, MO 65401 USA. [Hengartner-Cuellar, Andrea] Univ Calif Berkeley, Dept Cognit Sci, Berkeley, CA 94704 USA. [Ross, Hannah] Tennessee Technol Univ, Dept Mech Engn, Cookeville, TN 38505 USA. [Mascarenas, David] Los Alamos Natl Lab, Engn Inst, Los Alamos, NM 87545 USA. RP Embry, K (reprint author), Missouri Univ Sci & Technol, Dept Mech Engn, Rolla, MO 65401 USA. NR 10 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER PI NEW YORK PA 233 SPRING STREET, NEW YORK, NY 10013, UNITED STATES SN 2191-5644 BN 978-3-319-15212-7; 978-3-319-15211-0 J9 C PROC SOC EXP MECH PY 2015 BP 11 EP 22 DI 10.1007/978-3-319-15212-7_2 PG 12 WC Engineering, Mechanical; Instruments & Instrumentation SC Engineering; Instruments & Instrumentation GA BE3NY UT WOS:000371039700002 ER PT J AU Peaden, JM Tuberville, TD Buhlmann, KA Nafus, MG Todd, BD AF Peaden, J. Mark Tuberville, Tracey D. Buhlmann, Kurt A. Nafus, Melia G. Todd, Brian D. TI Delimiting road-effect zones for threatened species: implications for mitigation fencing SO WILDLIFE RESEARCH LA English DT Article DE conservation; road ecology; species recovery; turtle ID TORTOISES GOPHERUS-AGASSIZII; GRIZZLY BEARS; UNITED-STATES; HABITAT FRAGMENTATION; TURTLE POPULATIONS; HUMAN FOOTPRINT; HOME-RANGE; DESERT; MOVEMENT; BIODIVERSITY AB Context. Roads are a pernicious form of habitat loss for many wildlife populations because their effects often extend far beyond the roads themselves, giving rise to reduced wildlife abundance in road-effect zones. Quantifying the extent of road-effect zones more accurately portrays their impact on populations and the true extent to which habitat is lost for many species. Aim. The purpose of the present study was to evaluate ways of determining the extent of road-effect zones for a model study species to better quantify the effect of roads on habitat loss. Methods. We conducted road-side surveys for signs of Mojave desert tortoises (Gopherus agassizii) 0, 200, 400, 800 and 1600m from county roads and interstates, two of the most common road types in critical habitat of this threatened species. Using data from these road-side surveys, we estimated the extent of road-effect zones using piecewise regression and modified von Bertalanffy models. Key results. We found reduced abundances of tortoise sign along both county roads and interstates. Reductions extended farther from the large, high-traffic interstate than from the smaller, lower-traffic county roads (306m versus 230 m). The increase in the abundance of tortoise signs with distance from roads approximated a negative exponential curve. Conclusions. Interstate and county roads both contribute to habitat loss in road-side areas by making these habitats unsuitable to desert tortoises, presumably by removing animals via mortality from collisions with vehicles. Larger roads with greater traffic have more extensive effects. Implications. Roadside mitigation fencing has been proposed as one way to reduce mortality of desert tortoises and to reclaim habitat by allowing tortoises to recolonise currently depauperate road-effect zones. Immediate mortality is more likely to be prevented by fencing county roads where tortoises occur closer to roads and are more likely to be struck by vehicles and killed. However, fencing interstate should yield more reclaimed habitat than that obtained from fencing county roads. Managers must consider balancing these goals along with other concerns when deciding where to place roadside fencing. C1 [Peaden, J. Mark; Nafus, Melia G.; Todd, Brian D.] Univ Calif Davis, Dept Wildlife Fish & Conservat Biol, One Shields Ave, Davis, CA 95616 USA. [Tuberville, Tracey D.; Buhlmann, Kurt A.] Univ Georgia, Savannah River Ecol Lab, Aiken, SC 29802 USA. [Nafus, Melia G.] San Diego Zoo Inst Conservat Res, Escondido, CA 92027 USA. RP Todd, BD (reprint author), Univ Calif Davis, Dept Wildlife Fish & Conservat Biol, One Shields Ave, Davis, CA 95616 USA. EM btodd@ucdavis.edu OI Nafus, Melia/0000-0002-7325-3055 FU US Department of the Interior, Bureau of Land Management [L11AC20333]; California Energy Commission [500-10-020]; UC Davis; US Department of the Interior, National Park Service [P08AC00193]; University of Georgia; USDA National Institute of Food and Agriculture, Hatch project [CA-D-WFB-2097-H]; Department of Energy [DE-FC09-07SR22506] FX We thank E. A. Eskew for assistance with analyses, A. J. Nowakowski for reviewing the manuscript, and J. P. Rose for producing Fig. 1. Funding for this work was provided by US Department of the Interior, Bureau of Land Management agreement L11AC20333, to U. C. Davis. Additional support was provided in part by California Energy Commission agreement 500-10-020 with UC Davis and by US Department of the Interior, National Park Service agreement P08AC00193, with University of Georgia. This work was supported by the USDA National Institute of Food and Agriculture, Hatch project CA-D-WFB-2097-H. Manuscript preparation by T. D. Tuberville and K. A. Buhlmann was partially supported by the Department of Energy under Award Number DE-FC09-07SR22506 to the University of Georgia Research Foundation. No animals were handled during this study. NR 54 TC 0 Z9 0 U1 7 U2 11 PU CSIRO PUBLISHING PI CLAYTON PA UNIPARK, BLDG 1, LEVEL 1, 195 WELLINGTON RD, LOCKED BAG 10, CLAYTON, VIC 3168, AUSTRALIA SN 1035-3712 EI 1448-5494 J9 WILDLIFE RES JI Wildl. Res. PY 2015 VL 42 IS 8 BP 650 EP 659 DI 10.1071/WR15082 PG 10 WC Ecology; Zoology SC Environmental Sciences & Ecology; Zoology GA DE9OR UT WOS:000370968000004 ER PT S AU Abbas, A Meysing, DM Li, J Beach, JD Barnes, TM Walls, JM Wolden, CA AF Abbas, A. Meysing, D. M. Li, J. Beach, J. D. Barnes, T. M. Walls, J. M. Wolden, C. A. GP IEEE TI Structural and Chemical Characterization of the Back Contact Region in High Efficiency CdTe Solar Cells SO 2015 IEEE 42ND PHOTOVOLTAIC SPECIALIST CONFERENCE (PVSC) SE IEEE Photovoltaic Specialists Conference LA English DT Proceedings Paper CT IEEE 42nd Photovoltaic Specialist Conference (PVSC) CY JUN 14-19, 2015 CL New Orleans, LA SP IEEE DE CdTe solar cells; TEM; back contact; copper AB Cadmium telluride (CdTe) is the leading commercialized thin-film photovoltaic technology. Copper is commonly used in back contacts to obtain high efficiency, but has also been implicated as a harmful factor for device stability. Thus it is critical to understand its composition and distribution within complete devices. In this work the composition and structure of the back contact region was examined in high efficiency devices (similar to 16%) contacted using a ZnTe:Cu buffer layer followed by gold metallization. The microstructure was examined in the as-deposited state and after rapid thermal processing (RTP) using high resolution transmission electron microscopy and EDX chemical mapping. After RTP the ZnTe exhibits a bilayer structure with polycrystalline, twinned grains adjacent to Au and an amorphous region adjacent to CdTe characterized by extensive Cd-Zn interdiffusion. The copper that is co-deposited uniformly within ZnTe is found to segregate dramatically after RTP activation, either collecting near the ZnTe/Au interface or forming CuxTe clusters in CdTe at defects or grain boundaries near the interface with ZnTe. Chlorine, present throughout CdTe and concentrated at grain boundaries, does not penetrate significantly into the back contact region during RTP activation. C1 [Abbas, A.; Walls, J. M.] Univ Loughborough, Loughborough LE11 3TU, Leics, England. [Meysing, D. M.; Li, J.; Beach, J. D.; Wolden, C. A.] Colorado Sch Mines, Golden, CO 80401 USA. [Meysing, D. M.; Barnes, T. M.] Natl Renewable Energy Lab, Golden, CO 80401 USA. RP Abbas, A (reprint author), Univ Loughborough, Loughborough LE11 3TU, Leics, England. NR 11 TC 0 Z9 0 U1 5 U2 7 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 0160-8371 BN 978-1-4799-7944-8 J9 IEEE PHOT SPEC CONF PY 2015 PG 6 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE2SX UT WOS:000369992900032 ER PT S AU Ablekim, T Swain, SK Kuciauskas, D Parmar, NS Lynn, KG AF Ablekim, Tursun Swain, Santosh K. Kuciauskas, Darius Parmar, Narendra S. Lynn, Kelvin G. GP IEEE TI Fabrication of Single-Crystal Solar Cells from Phosphorous-Doped CdTe Wafer SO 2015 IEEE 42ND PHOTOVOLTAIC SPECIALIST CONFERENCE (PVSC) SE IEEE Photovoltaic Specialists Conference LA English DT Proceedings Paper CT IEEE 42nd Photovoltaic Specialist Conference (PVSC) CY JUN 14-19, 2015 CL New Orleans, LA SP IEEE DE CdTe/CdS solar cells; single crystal; phosphorous-doped; charge carrier lifetime; hole density AB A phosphorous doped CdTe boule was grown from melt using the modified vertical Bridgman technique. Single crystals prepared from the boule showed hole density of (5-10) x 10(15) cm(-3), resistivity similar to(10-50) Omega.cm and mobility of similar to 50 cm(2)/v.s determined by Hall measurement. The two-photon excitation time-resolved photoluminescence (2PE-TRPL) measurement revealed a bulk minority carrier lifetime of similar to 47 ns. A 500 mu m thick single-crystal wafer was prepared and CdS/CdTe heterojunction solar cells were fabricated with ITO/CdS/CdTe/Cu/Au structure where all relevant thin film layers were deposited by DC/RF magnetron sputtering. An efficiency of similar to 11 % and short circuit current density of as high as similar to 25 mA/cm(2) has been obtained on a cell upon annealing at 320 degrees C. The high short circuit current density could be attributed to the superior quality of the CdTe material with a relatively longer minority carrier lifetime. C1 [Ablekim, Tursun; Swain, Santosh K.; Parmar, Narendra S.; Lynn, Kelvin G.] Washington State Univ, Ctr Mat Res, Pullman, WA 99164 USA. [Kuciauskas, Darius] Natl Renewable Energy Lab, Golden, CO 80401 USA. RP Ablekim, T (reprint author), Washington State Univ, Ctr Mat Res, Pullman, WA 99164 USA. NR 10 TC 0 Z9 0 U1 4 U2 6 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 0160-8371 BN 978-1-4799-7944-8 J9 IEEE PHOT SPEC CONF PY 2015 PG 4 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE2SX UT WOS:000369992903109 ER PT S AU Abusnina, M Matin, M Moutinho, H Al-Jassim, M AF Abusnina, Mohamed Matin, Mohammad Moutinho, Helio Al-Jassim, Mowafak GP IEEE TI Impact of the Stack Order in Cu-Zn-Sn Metal Precursors on the Properties of Cu2ZnSnS4 Thin Films SO 2015 IEEE 42ND PHOTOVOLTAIC SPECIALIST CONFERENCE (PVSC) SE IEEE Photovoltaic Specialists Conference LA English DT Proceedings Paper CT IEEE 42nd Photovoltaic Specialist Conference (PVSC) CY JUN 14-19, 2015 CL New Orleans, LA SP IEEE DE Cu2ZnSnS4; CZTS; stacked precursor; sulfurization; thin films AB Cu2ZnSnS4 (CZTS) thin films were grown by the annealing of metallic precursors with different stack orders in sulfur atmosphere. The sequential deposition of the metal layers from single Cu, Zn, and Sn targets on Mo-coated soda-lime glass substrates was carried out using radio-frequency magnetron sputtering. In this work, we investigated the effect of the sequence of metal layers on the chemical, structural, and morphological properties of the final CZTS films using X-ray fluorescence (XRF), X-ray diffraction (XRD), Raman scattering spectroscopy, scanning electron microscopy, and energy-dispersive spectroscopy. The realized stack sequences were Mo/Sn/Zn/Cu, Mo/Sn/Cu/Zn, Mo/Cu/Zn/Sn, Mo/Cu/Sn/Zn, and Mo/Zn/Cu/Sn. XRF measurements revealed notable impact of the metal layers' stacking order in the precursor on the chemical composition. It also showed Sn loss and high Zn concentration in all sulfurized films; however, having Cu on the Sn or Zn/Sn layer showed some minimization of the Sn loss. XRD showed CZTS films with good crystallinity and no evidence of the presence of secondary phases. Changing the precursor stack order did not show any influence on the films' crystallinity or texture. Raman spectroscopy, in contrast, indicated the presence of ZnS phase beside the main CZTS phase. The morphology study showed significant effect on the structure of the final CZTS films depending on the used stack order. Generally, the films that originated from precursors having a Zn layer deposited directly on Mo or as the second layer exhibited better adhesion to the Mo layer and showed fewer or even no voids compared to the other films. C1 [Abusnina, Mohamed; Moutinho, Helio; Al-Jassim, Mowafak] Natl Renewable Energy Lab, Golden, CO 80401 USA. [Abusnina, Mohamed; Matin, Mohammad] Univ Denver, Daniel Felix Ritchie Sch Engn & Comp Sci, Elect & Comp Engn Dept, Denver, CO 80208 USA. RP Abusnina, M (reprint author), Natl Renewable Energy Lab, Golden, CO 80401 USA. NR 7 TC 0 Z9 0 U1 2 U2 3 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 0160-8371 BN 978-1-4799-7944-8 J9 IEEE PHOT SPEC CONF PY 2015 PG 4 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE2SX UT WOS:000369992903110 ER PT S AU Ashraf, A Davis, KO Ogutman, K Schoenfeld, WV Eisaman, MD AF Ashraf, Ahsan Davis, Kristopher O. Oeguetman, Kortan Schoenfeld, Winston V. Eisaman, Matthew D. GP IEEE TI Hyperspectral laser beam induced current system for solar cell characterization SO 2015 IEEE 42ND PHOTOVOLTAIC SPECIALIST CONFERENCE (PVSC) SE IEEE Photovoltaic Specialists Conference LA English DT Proceedings Paper CT IEEE 42nd Photovoltaic Specialist Conference (PVSC) CY JUN 14-19, 2015 CL New Orleans, LA SP IEEE DE hyperspectral; lbic; photovoltaic ID SILICON AB We introduce a novel hyperspectral laser beam induced current (LBIC) system that uses a supercontinuum laser that can be tuned from 400nm - 1200nm with diffracted limited spot size. The solar cell is light biased while simultaneously being illuminated by a chopped laser beam at a given wavelength. Current-voltage measurements performed by measuring the current perturbation due to the laser using a lock-in amplifier allow us to extract performance metrics at a specific lateral position and depth (by tuning the wavelength of the laser) while the device is at operating conditions. These parameters are simultaneously compared to material deformations as determined from the doping density, and the built-in voltage. Concurrently we also probe lateral recombination variation by measuring the activation energy thereby providing a comprehensive and unique analysis. C1 [Ashraf, Ahsan; Eisaman, Matthew D.] Brookhaven Natl Lab, Sustainable Energy Technol Dept, Upton, NY 11973 USA. [Ashraf, Ahsan; Eisaman, Matthew D.] SUNY Stony Brook, Dept Phys & Astron, Stony Brook, NY 11794 USA. [Davis, Kristopher O.; Oeguetman, Kortan; Schoenfeld, Winston V.] Univ Cent Florida, Florida Solar Energy Ctr, Cocoa, FL 32922 USA. [Davis, Kristopher O.; Schoenfeld, Winston V.] Univ Cent Florida, Coll Opt & Photon, CREOL, Orlando, FL 32826 USA. [Davis, Kristopher O.; Oeguetman, Kortan; Schoenfeld, Winston V.] US Photovolta Mfg Consortium, C Si Div, Orlando, FL 32826 USA. [Eisaman, Matthew D.] SUNY Stony Brook, Dept Elect & Comp Engn, Stony Brook, NY 11794 USA. RP Ashraf, A (reprint author), Brookhaven Natl Lab, Sustainable Energy Technol Dept, Upton, NY 11973 USA. NR 6 TC 0 Z9 0 U1 2 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 0160-8371 BN 978-1-4799-7944-8 J9 IEEE PHOT SPEC CONF PY 2015 PG 4 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE2SX UT WOS:000369992902089 ER PT S AU Baggu, M Giraldez, J Harris, T Brunhart-Lupo, N Lisell, L Narang, D AF Baggu, Murali Giraldez, Julieta Harris, Tom Brunhart-Lupo, Nicholas Lisell, Lars Narang, David GP IEEE TI Interconnection Assessment Methodology and Cost Benefit Analysis for High-Penetration PV Deployment in the Arizona Public Service System SO 2015 IEEE 42ND PHOTOVOLTAIC SPECIALIST CONFERENCE (PVSC) SE IEEE Photovoltaic Specialists Conference LA English DT Proceedings Paper CT IEEE 42nd Photovoltaic Specialist Conference (PVSC) CY JUN 14-19, 2015 CL New Orleans, LA SP IEEE DE asset management; business process re-engineering; cost benefit analysis; data acquisition; database systems; decision making; distributed power generation; enterprise resource planning; financial management; graphical user interfaces; photovoltaic systems; power system planning; power system simulation; reactive power control; SCADA systems; power system interconnection; voltage control AB In an effort to better understand the impacts of high penetrations of photovoltaic (PV) generators on distribution systems, Arizona Public Service and its partners completed a multi-year project to develop the tools and knowledge base needed to safely and reliably integrate high penetrations of utility-and residential-scale PV. Building upon the APS Community Power Project-Flagstaff Pilot, this project investigates the impact of PV on a representative feeder in northeast Flagstaff. To quantify and catalog the effects of the estimated 1.3 MW of PV that will be installed on the feeder (both smaller units at homes and large, centrally located systems), high-speed weather and electrical data acquisition systems and digital "smart" meters were designed and installed to facilitate monitoring and to build and validate comprehensive, high-resolution models of the distribution system. These models are being developed to analyze the impacts of PV on distribution circuit protection systems (including coordination and anti-islanding), predict voltage regulation and phase balance issues, and develop volt/VAr control schemes. This paper continues from a paper presented at the 2014 IEEE PVSC conference that described feeder model evaluation and high penetration advanced scenario analysis, specifically feeder reconfiguration. This paper presents results from Phase 5 of the project. Specifically, the paper discusses tool automation; interconnection assessment methodology and cost benefit analysis. C1 [Baggu, Murali; Giraldez, Julieta; Harris, Tom; Brunhart-Lupo, Nicholas; Lisell, Lars] Natl Renewable Energy Lab, Golden, CO 80401 USA. [Narang, David] Arizona Publ Serv, Phoenix, AZ USA. RP Baggu, M (reprint author), Natl Renewable Energy Lab, Golden, CO 80401 USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 0160-8371 BN 978-1-4799-7944-8 J9 IEEE PHOT SPEC CONF PY 2015 PG 6 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE2SX UT WOS:000369992902166 ER PT S AU Barbose, G Satchwell, A Mills, A Wiser, R Cappers, P Darghouth, N AF Barbose, Galen Satchwell, Andy Mills, Andrew Wiser, Ryan Cappers, Pete Darghouth, Naim GP IEEE TI The Impacts of Net Metering on Utility Profits and Rates: Case Studies of Two Prototypical Utilities SO 2015 IEEE 42ND PHOTOVOLTAIC SPECIALIST CONFERENCE (PVSC) SE IEEE Photovoltaic Specialists Conference LA English DT Proceedings Paper CT IEEE 42nd Photovoltaic Specialist Conference (PVSC) CY JUN 14-19, 2015 CL New Orleans, LA SP IEEE DE net metering; profits; rates; utilities AB Heated debates about the impact of net metering on utility shareholders and ratepayers have surfaced in some of the larger state solar markets and will only become more pronounced and widespread as solar costs decline and deployment accelerates. In order to inform these discussions, we performed a scoping analysis to quantify the magnitude of the financial impacts of distributed PV on utility shareholders and ratepayers, and that assesses the potential efficacy of various options for mitigating those impacts. We quantify the impacts of customer-sited PV for two prototypical investor-owned utilities: a vertically integrated utility located in the southwest and a wires-only utility and default service supplier located in the northeast. For each utility, we model the impacts of customer-sited PV over a 20-year period, estimating changes to utility costs, revenues, average rates, and utility shareholder earnings and return-on-equity. C1 [Barbose, Galen; Satchwell, Andy; Mills, Andrew; Wiser, Ryan; Cappers, Pete; Darghouth, Naim] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. RP Barbose, G (reprint author), Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 0160-8371 BN 978-1-4799-7944-8 J9 IEEE PHOT SPEC CONF PY 2015 PG 5 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE2SX UT WOS:000369992902165 ER PT S AU Basore, PA Chung, D Buonassisi, T AF Basore, Paul A. Chung, Donald Buonassisi, Tonio GP IEEE TI Economics of Future Growth in Photovoltaics Manufacturing SO 2015 IEEE 42ND PHOTOVOLTAIC SPECIALIST CONFERENCE (PVSC) SE IEEE Photovoltaic Specialists Conference LA English DT Proceedings Paper CT IEEE 42nd Photovoltaic Specialist Conference (PVSC) CY JUN 14-19, 2015 CL New Orleans, LA SP IEEE DE photovoltaics; manufacturing; capex ID COST AB The past decade's record of growth in the photovoltaics manufacturing industry indicates that global investment in manufacturing capacity for photovoltaic modules tends to increase in proportion to the size of the industry. The slope of this proportionality determines how fast the industry will grow in the future. Two key parameters determine this slope. One is the annual global investment in manufacturing capacity normalized to the manufacturing capacity for the previous year (capacity-normalized capital investment rate, CapIR, units $/W). The other is how much capital investment is required for each watt of annual manufacturing capacity, normalized to the service life of the assets (capacity-normalized capital demand rate, CapDR, units $/W). If these two parameters remain unchanged from the values they have held for the past few years, global manufacturing capacity will peak in the next few years and then decline. However, it only takes a small improvement in CapIR to ensure future growth in photovoltaics. Any accompanying improvement in CapDR will accelerate that growth. C1 [Basore, Paul A.; Chung, Donald] Natl Renewable Energy Lab, Golden, CO 80401 USA. [Buonassisi, Tonio] MIT, Cambridge, MA 02139 USA. RP Basore, PA (reprint author), Natl Renewable Energy Lab, Golden, CO 80401 USA. NR 6 TC 0 Z9 0 U1 1 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 0160-8371 BN 978-1-4799-7944-8 J9 IEEE PHOT SPEC CONF PY 2015 PG 4 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE2SX UT WOS:000369992900030 ER PT S AU Basso, T Chakraborty, S Hoke, A Coddington, M AF Basso, Thomas Chakraborty, Sudipta Hoke, Andy Coddington, Michael GP IEEE TI IEEE 1547 Standards Advancing Grid Modernization SO 2015 IEEE 42ND PHOTOVOLTAIC SPECIALIST CONFERENCE (PVSC) SE IEEE Photovoltaic Specialists Conference LA English DT Proceedings Paper CT IEEE 42nd Photovoltaic Specialist Conference (PVSC) CY JUN 14-19, 2015 CL New Orleans, LA SP IEEE DE conformance; converter; distributed energy resources; grid; IEEE 1547; integration; interconnection; interoperability; inverter; microgrid; power system; Smart Grid; standard; storage; testing AB Technology advances including development of advanced distributed energy resources (DER) and grid-integrated operations and controls functionalities have surpassed the requirements in current standards and codes for DER interconnection with the distribution grid. The full revision of IEEE Standards 1547 (requirements for DER-grid interconnection and interoperability) and 1547.1 (test procedures for conformance to 1547) are establishing requirements and best practices for state-of-the-art DER including variable renewable energy sources. The revised standards will also address challenges associated with interoperability and transmission-level effects, in addition to strictly addressing the distribution grid needs. This paper provides the status and future direction of the ongoing development focus for the 1547 standards. C1 [Basso, Thomas; Chakraborty, Sudipta; Hoke, Andy; Coddington, Michael] Natl Renewable Energy Lab, Golden, CO 80401 USA. RP Basso, T (reprint author), Natl Renewable Energy Lab, Golden, CO 80401 USA. NR 11 TC 0 Z9 0 U1 1 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 0160-8371 BN 978-1-4799-7944-8 J9 IEEE PHOT SPEC CONF PY 2015 PG 5 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE2SX UT WOS:000369992903004 ER PT S AU Boucher, JW Greenaway, AL Ritenour, AJ Davis, AL Bachman, BF Aloni, S Boettcher, SW AF Boucher, Jason W. Greenaway, Ann L. Ritenour, Andrew J. Davis, Allison L. Bachman, Benjamin F. Aloni, Shaul Boettcher, Shannon W. GP IEEE TI Low-Cost Growth of III-V Layers on Si Using Close-Spaced Vapor Transport SO 2015 IEEE 42ND PHOTOVOLTAIC SPECIALIST CONFERENCE (PVSC) SE IEEE Photovoltaic Specialists Conference LA English DT Proceedings Paper CT IEEE 42nd Photovoltaic Specialist Conference (PVSC) CY JUN 14-19, 2015 CL New Orleans, LA SP IEEE DE III-V semiconductor materials; epitaxial layers; microstructure; silicon ID PHASE EPITAXY; NANOWIRES; GAASP AB Close-spaced vapor transport (CSVT) uses solid precursors to deposit material at high rates and with high precursor utilization. The use of solid precursors could significantly reduce the costs associated with III-V photovoltaics, particularly if growth on Si substrates can be demonstrated. We present preliminary results of the growth of GaAs1-xPx with x approximate to 0.3 and 0.6, showing that CSVT can be used to produce III-V-V' alloys with band gaps suitable for tandem devices. Additionally, we have grown GaAs on Si by first thermally depositing films of Ge and subsequently depositing GaAs by CSVT. Patterning the Ge into islands prevents cracking due to thermal mismatch and is useful for potential tandem structures. C1 [Boucher, Jason W.; Greenaway, Ann L.; Ritenour, Andrew J.; Davis, Allison L.; Bachman, Benjamin F.; Boettcher, Shannon W.] Univ Oregon, Inst Mat Sci, Eugene, OR 97403 USA. [Aloni, Shaul] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Mol Foundry, Berkeley, CA 94720 USA. RP Boucher, JW (reprint author), Univ Oregon, Inst Mat Sci, Eugene, OR 97403 USA. NR 14 TC 0 Z9 0 U1 1 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 0160-8371 BN 978-1-4799-7944-8 J9 IEEE PHOT SPEC CONF PY 2015 PG 4 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE2SX UT WOS:000369992902039 ER PT S AU Boyle, L Burton, P Flinchpaugh, H Danner, V Robinson, C Blackwell, K King, B Hannigan, M AF Boyle, Liza Burton, Patrick Flinchpaugh, Holly Danner, Victoria Robinson, Charles Blackwell, Ken King, Bruce Hannigan, Michael GP IEEE TI Initial Results of a Five Site Study Comparing Spatial Variability of Soiling and Ambient Particulate Concentrations SO 2015 IEEE 42ND PHOTOVOLTAIC SPECIALIST CONFERENCE (PVSC) SE IEEE Photovoltaic Specialists Conference LA English DT Proceedings Paper CT IEEE 42nd Photovoltaic Specialist Conference (PVSC) CY JUN 14-19, 2015 CL New Orleans, LA SP IEEE DE Energy efficiency; Solar energy; Soil ID DUST ACCUMULATION; SOLAR; CALIFORNIA; COLLECTORS; MODULES; COVERS AB Initial results from a study examining spatial variations of soiling are presented. Soiling from five sites is examined. Three sites in the area surrounding Denver, Colorado and two additional sites, one in Albuquerque New Mexico, and one in Cocoa Florida at US Department of Energy Regional Test Centers. These locations represent a diverse array of climates in which solar energy may be utilized. These locations represent a diverse array of climates in which solar energy may be utilized. Results highlight similarities and differences between soiling at locations across the United States. In addition to soiling data, ambient particulate data is also collected at the five sites, and results from these measurements, and how they relate to soiling, are presented. C1 [Boyle, Liza; Flinchpaugh, Holly; Danner, Victoria; Hannigan, Michael] Univ Colorado, Boulder, CO 80309 USA. [Burton, Patrick; Robinson, Charles; King, Bruce] Sandia Natl Labs, Albuquerque, NM 87185 USA. [Blackwell, Ken] Florida Solar Energy Ctr, Cocoa, FL 32992 USA. RP Boyle, L (reprint author), Univ Colorado, Boulder, CO 80309 USA. NR 12 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 0160-8371 BN 978-1-4799-7944-8 J9 IEEE PHOT SPEC CONF PY 2015 PG 4 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE2SX UT WOS:000369992901169 ER PT S AU Budhraja, V Devayajanam, S AF Budhraja, Vinay Devayajanam, Srinivas GP IEEE TI Effect of SiO2 passivation on CdTe based solar cells SO 2015 IEEE 42ND PHOTOVOLTAIC SPECIALIST CONFERENCE (PVSC) SE IEEE Photovoltaic Specialists Conference LA English DT Proceedings Paper CT IEEE 42nd Photovoltaic Specialist Conference (PVSC) CY JUN 14-19, 2015 CL New Orleans, LA SP IEEE DE CdTe solar cells; passivation; SiO2; annealing ID SURFACE PASSIVATION; OXIDATION AB In this work we did the back passivation of CdTe using silicon di oxide and studied its effect on CdTe based solar cells. The performance of solar cell was improved by doing the silicon di oxide passivation and this effect was seen on dark I-V, light J-V and C-V characteristics. We also did the annealing of solar cell and optimized the temperature which further improves the performance of solar cell. C1 [Budhraja, Vinay] ITM Univ, Sect 23A, Gurgaon 122017, Harayana, India. [Devayajanam, Srinivas] Natl Renewable Energy Lab, Golden, CO 80401 USA. RP Budhraja, V (reprint author), ITM Univ, Sect 23A, Gurgaon 122017, Harayana, India. NR 16 TC 0 Z9 0 U1 2 U2 4 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 0160-8371 BN 978-1-4799-7944-8 J9 IEEE PHOT SPEC CONF PY 2015 PG 3 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE2SX UT WOS:000369992900206 ER PT S AU Burton, PD Hendrickson, A King, BH AF Burton, Patrick D. Hendrickson, Alex King, Bruce H. GP IEEE TI Macro- and Microscale Particle Size Effects of Soil on Photovoltaic Surfaces SO 2015 IEEE 42ND PHOTOVOLTAIC SPECIALIST CONFERENCE (PVSC) SE IEEE Photovoltaic Specialists Conference LA English DT Proceedings Paper CT IEEE 42nd Photovoltaic Specialist Conference (PVSC) CY JUN 14-19, 2015 CL New Orleans, LA SP IEEE DE Soiling; surface contamination; performance loss; standardized test methods ID DUST AB The texture or patterning of soil on PV surfaces may influence light capture at various angles of incidence. Accumulated soil can be considered a micro-shading element, which changes with respect to AOI. While scattering losses at this scale would be significant only to the most sensitive devices, microshading could lead to hot spot formation and other reliability issues. Indoor soil deposition was used to prepare test coupons for simultaneous AOI and soiling loss experiments. A mixed solvent deposition technique was used to consistently deposit patterned test soils onto glass slides. Transmission decreased as soil loading and AOI increased. Highly dispersed particles are less prone to secondary scattering, improving overall light collection. C1 [Burton, Patrick D.; Hendrickson, Alex; King, Bruce H.] Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. RP Burton, PD (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. NR 10 TC 0 Z9 0 U1 2 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 0160-8371 BN 978-1-4799-7944-8 J9 IEEE PHOT SPEC CONF PY 2015 PG 5 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE2SX UT WOS:000369992901168 ER PT S AU Buurma, C Sen, FG Paulauskas, T Sun, C Kim, M Sivananthan, S Klie, RF Chan, MKY AF Buurma, Christopher Sen, Fatih G. Paulauskas, Tadas Sun, Ce Kim, Moon Sivananthan, Sivalingam Klie, Robert F. Chan, Maria K. Y. GP IEEE TI Creation and Analysis of Atomic Structures for CdTe Bi-crystal Interfaces by the Grain Boundary Genie SO 2015 IEEE 42ND PHOTOVOLTAIC SPECIALIST CONFERENCE (PVSC) SE IEEE Photovoltaic Specialists Conference LA English DT Proceedings Paper CT IEEE 42nd Photovoltaic Specialist Conference (PVSC) CY JUN 14-19, 2015 CL New Orleans, LA SP IEEE DE Grain Boundaries; Computer Simulation ID SIMULATION; EFFICIENCY AB Grain boundaries (GB) in poly-CdTe solar cells play an important role in species diffusion, segregation, defect formation, and carrier recombination. While the creation of specific high-symmetry interfaces can be straight forward, the creation of general GB structures in many material systems is difficult if periodic boundary conditions are to be enforced. Here we describe a novel algorithm and implementation to generate initial general GB structures for CdTe in an automated way, and we investigate some of these structures using density functional theory (DFT). Example structures include those with bi-crystals already fabricated for comparison, and those planning to be investigated in the future. C1 [Buurma, Christopher; Paulauskas, Tadas; Sivananthan, Sivalingam; Klie, Robert F.] Univ Illinois, Chicago, IL 60607 USA. [Sen, Fatih G.; Chan, Maria K. Y.] Argonne Natl Lab, Argonne, IL 60439 USA. [Sun, Ce; Kim, Moon] Univ Texas Dallas, Dallas, TX 75230 USA. RP Buurma, C (reprint author), Univ Illinois, Chicago, IL 60607 USA. NR 11 TC 0 Z9 0 U1 2 U2 3 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 0160-8371 BN 978-1-4799-7944-8 J9 IEEE PHOT SPEC CONF PY 2015 PG 3 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE2SX UT WOS:000369992901119 ER PT S AU Campanelli, M Duck, B Emery, K AF Campanelli, Mark Duck, Benjamin Emery, Keith GP IEEE TI Quantifying and Reducing Curve-Fitting Uncertainty in I-sc SO 2015 IEEE 42ND PHOTOVOLTAIC SPECIALIST CONFERENCE (PVSC) SE IEEE Photovoltaic Specialists Conference LA English DT Proceedings Paper CT IEEE 42nd Photovoltaic Specialist Conference (PVSC) CY JUN 14-19, 2015 CL New Orleans, LA SP IEEE DE Bayesian inference; data window selection; evidence; linear regression; measurement uncertainty analysis; model discrepancy; noise model; uncertainty quantification AB Current-voltage (I-V) curve measurements of photovoltaic (PV) devices are used to determine performance parameters and to establish traceable calibration chains. Measurement standards specify localized curve fitting methods, e.g., straightline interpolation/extrapolation of the I-V curve points near short-circuit current, I-sc. By considering such fits as statistical linear regressions, uncertainties in the performance parameters are readily quantified. However, the legitimacy of such a computed uncertainty requires that the model be a valid (local) representation of the I-V curve and that the noise be sufficiently well characterized. Using more data points often has the advantage of lowering the uncertainty. However, more data points can make the uncertainty in the fit arbitrarily small, and this fit uncertainty misses the dominant residual uncertainty due to so-called model discrepancy. Using objective Bayesian linear regression for straight-line fits for I-sc, we investigate an evidence-based method to automatically choose data windows of I-V points with reduced model discrepancy. We also investigate noise effects. Uncertainties, aligned with the Guide to the Expression of Uncertainty in Measurement (GUM), are quantified throughout. Index Terms-Bayesian inference, data window selection, evidence, linear regression, measurement uncertainty analysis, model discrepancy, noise model, uncertainty quantification. C1 [Campanelli, Mark; Emery, Keith] Natl Renewable Energy Lab, Golden, CO 80401 USA. [Duck, Benjamin] CSIRO Energy Flagship, Mayfield West, NSW 2304, Australia. RP Campanelli, M (reprint author), Natl Renewable Energy Lab, Golden, CO 80401 USA. NR 11 TC 0 Z9 0 U1 2 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 0160-8371 BN 978-1-4799-7944-8 J9 IEEE PHOT SPEC CONF PY 2015 PG 6 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE2SX UT WOS:000369992902087 ER PT S AU Chen, CT Saive, R Emmer, HS Aloni, S Atwater, HA AF Chen, Christopher T. Saive, Rebecca Emmer, Hal S. Aloni, Shaul Atwater, Harry A. GP IEEE TI GaP/Si Heterojunction Solar Cells SO 2015 IEEE 42ND PHOTOVOLTAIC SPECIALIST CONFERENCE (PVSC) SE IEEE Photovoltaic Specialists Conference LA English DT Proceedings Paper CT IEEE 42nd Photovoltaic Specialist Conference (PVSC) CY JUN 14-19, 2015 CL New Orleans, LA SP IEEE DE photovoltaic cells; silicon; gallium phosphide; heterojunctions ID EFFICIENCY; GROWTH; SI AB The world record efficiency and open circuit voltage for crystalline silicon solar cells are held by a-Si/Si heterojunction devices. While a-Si provides excellent surface passivation, these heterojunction devices are limited by non-ideal optical and electronic properties. Gallium phosphide is a candidate material for replacing a-Si in a heterojunction device, promising lower parasitic absorption and better carrier mobilities. In this work, we present our results in growing high quality GaP thin films directly on Si using a two-step nucleation and growth scheme with metalorganic chemical vapor deposition, characterization, and x-ray photoelectron spectroscopy band offset measurements toward realizing a GaP/Si heterojunction device. C1 [Chen, Christopher T.; Saive, Rebecca; Emmer, Hal S.; Atwater, Harry A.] CALTECH, Pasadena, CA 91125 USA. [Aloni, Shaul] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Mol Foundry, Berkeley, CA 94720 USA. RP Chen, CT (reprint author), CALTECH, Pasadena, CA 91125 USA. NR 10 TC 0 Z9 0 U1 2 U2 3 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 0160-8371 BN 978-1-4799-7944-8 J9 IEEE PHOT SPEC CONF PY 2015 PG 3 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE2SX UT WOS:000369992902204 ER PT S AU Cheng, DL Mather, B Seguin, R Hambrick, J Broadwater, RP AF Cheng, Danling Mather, Barry Seguin, Richard Hambrick, Joshua Broadwater, Robert P. GP IEEE TI PV Impact Assessment for Very High Penetration Levels SO 2015 IEEE 42ND PHOTOVOLTAIC SPECIALIST CONFERENCE (PVSC) SE IEEE Photovoltaic Specialists Conference LA English DT Proceedings Paper CT IEEE 42nd Photovoltaic Specialist Conference (PVSC) CY JUN 14-19, 2015 CL New Orleans, LA SP IEEE DE distributed power generation; photovoltaic systems; power system simulation; PV impact assessment AB This paper describes a granular approach for investigating the impacts of very high PV generation penetration. Studies on two real-world distribution feeders connected to PV plants are presented. The studies include both steady-state and time series power flow analyses, which include the effects of solar variability. The goal of the study is to predict the effects of increasing levels of PV generation as it reaches very high penetration levels. Impact results from the analyses are described along with potential mitigations. C1 [Cheng, Danling; Seguin, Richard; Hambrick, Joshua] Elect Distribut Design Inc, Blacksburg, VA 24060 USA. [Mather, Barry] Natl Renewable Energy Lab, Golden, CO 80401 USA. [Broadwater, Robert P.] Virginia Tech, Dept Elect & Comp Engn, Blacksburg, VA 24060 USA. RP Cheng, DL (reprint author), Elect Distribut Design Inc, Blacksburg, VA 24060 USA. NR 10 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 0160-8371 BN 978-1-4799-7944-8 J9 IEEE PHOT SPEC CONF PY 2015 PG 6 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE2SX UT WOS:000369992902130 ER PT S AU Colegrove, E Albin, DS Guthrey, H Harvey, S Burst, J Moutinho, H Farrell, S Al-Jassim, M Metzger, WK AF Colegrove, Eric Albin, David S. Guthrey, Harvey Harvey, Steve Burst, James Moutinho, Helio Farrell, Stuart Al-Jassim, Mowafak Metzger, Wyatt K. GP IEEE TI Phosphorus doping of polycrystalline CdTe by diffusion SO 2015 IEEE 42ND PHOTOVOLTAIC SPECIALIST CONFERENCE (PVSC) SE IEEE Photovoltaic Specialists Conference LA English DT Proceedings Paper CT IEEE 42nd Photovoltaic Specialist Conference (PVSC) CY JUN 14-19, 2015 CL New Orleans, LA SP IEEE DE cadmium telluride; phosphorus; diffusion photovoltaic cells ID SOLAR-CELLS AB Phosphorus diffusion in single crystal and polycrystalline CdTe material is explored using various methods. Dynamic secondary ion mass spectroscopy (SIMS) is used to determine 1D P diffusion profiles. A 2D diffusion model is used to determine the expected cross-sectional distribution of P in CdTe after diffusion anneals. Time of flight SIMS and cross-sectional cathodoluminescence corroborates expected P distributions. Devices fabricated with diffused P exhibit hole concentrations up to low 10(15) cm(-3), however a subsequent activation anneal enabled hole concentrations greater than 10(16) cm(-3). CdCl2 treatments and Cu based contacts were also explored in conjunction with the P doping process. C1 [Colegrove, Eric; Albin, David S.; Guthrey, Harvey; Harvey, Steve; Burst, James; Moutinho, Helio; Farrell, Stuart; Al-Jassim, Mowafak; Metzger, Wyatt K.] Natl Renewable Energy Lab, Golden, CO 80401 USA. RP Colegrove, E (reprint author), Natl Renewable Energy Lab, Golden, CO 80401 USA. NR 13 TC 0 Z9 0 U1 1 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 0160-8371 BN 978-1-4799-7944-8 J9 IEEE PHOT SPEC CONF PY 2015 PG 6 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE2SX UT WOS:000369992903107 ER PT S AU Lucas, FWD Welch, AW Baranowski, LL Dippo, PC Mascaro, LH Zakutayev, A AF de Souza Lucas, Francisco Willian Welch, Adam W. Baranowski, Lauryn L. Dippo, Patricia C. Mascaro, Lucia H. Zakutayev, Andriy GP IEEE TI Thermal treatment improvement of CuSbS2 absorbers SO 2015 IEEE 42ND PHOTOVOLTAIC SPECIALIST CONFERENCE (PVSC) SE IEEE Photovoltaic Specialists Conference LA English DT Proceedings Paper CT IEEE 42nd Photovoltaic Specialist Conference (PVSC) CY JUN 14-19, 2015 CL New Orleans, LA SP IEEE DE annealing; CuSbS2; non-toxic and earth-abundant absorber; Sb2S3 selective chemical etch ID SOLAR-CELLS AB Thermal treatment in Sb2S3 vapor was used to improve the quality of CuSbS2 thin films, a promising non-toxic and earth-abundant absorber. A change in the CuSbS2 crystallographic texture and a decrease in the lattice stress were observed, as well as increases in the grain size, photoluminescence intensity and photoconductivity. To eliminate the influence of the possible Sb2S3 rich surface layer on photovoltaic performance, a selective chemical etching with KOH was developed. C1 [de Souza Lucas, Francisco Willian; Welch, Adam W.; Baranowski, Lauryn L.; Dippo, Patricia C.; Zakutayev, Andriy] Natl Renewable Energy Lab, 15013 Denver West Pkwy, Golden, CO 80401 USA. [de Souza Lucas, Francisco Willian; Mascaro, Lucia H.] Univ Fed Sao Carlos, BR-13565905 Sao Carlos, SP, Brazil. [Welch, Adam W.; Baranowski, Lauryn L.] Colorado Sch Mines, Golden, CO 80401 USA. RP Lucas, FWD (reprint author), Natl Renewable Energy Lab, 15013 Denver West Pkwy, Golden, CO 80401 USA. RI Lucas, Francisco/E-8106-2016; FAPESP, CDMF/J-3591-2015 OI Lucas, Francisco/0000-0002-4637-8469; NR 18 TC 0 Z9 0 U1 0 U2 4 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 0160-8371 BN 978-1-4799-7944-8 J9 IEEE PHOT SPEC CONF PY 2015 PG 5 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE2SX UT WOS:000369992901081 ER PT S AU Deceglie, MG Silverman, TJ Marion, B Kurtz, SR AF Deceglie, Michael G. Silverman, Timothy J. Marion, Bill Kurtz, Sarah R. GP IEEE TI Temperature-dependent light-stabilized states in thin-film PV modules SO 2015 IEEE 42ND PHOTOVOLTAIC SPECIALIST CONFERENCE (PVSC) SE IEEE Photovoltaic Specialists Conference LA English DT Proceedings Paper CT IEEE 42nd Photovoltaic Specialist Conference (PVSC) CY JUN 14-19, 2015 CL New Orleans, LA SP IEEE DE Metastability; transient; photovoltaic; solar; light soak; thin film; characterization; measurement AB Thin-film photovoltaic modules are known to exhibit light-induced transient behavior which interferes with accurate and repeatable measurements of power. Typically power measurements are made after a light exposure in order to target a "light state" of the module that is representative of outdoor performance. Here we show that the concept of a unique light state is poorly defined for both CIGS and CdTe modules. Instead we find that their metastable state after a light exposure can depend on the temperature of the module during the exposure. We observe changes in power as large as 5.8% for a 20 degrees C difference in light exposure temperature. These results lead us to conclude that for applications in which reproducibility and repeatability are critical, module temperature should be tightly controlled during light exposure. C1 [Deceglie, Michael G.; Silverman, Timothy J.; Marion, Bill; Kurtz, Sarah R.] Natl Renewable Energy Lab, Golden, CO 80401 USA. RP Deceglie, MG (reprint author), Natl Renewable Energy Lab, Golden, CO 80401 USA. NR 6 TC 0 Z9 0 U1 1 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 0160-8371 BN 978-1-4799-7944-8 J9 IEEE PHOT SPEC CONF PY 2015 PG 3 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE2SX UT WOS:000369992901037 ER PT S AU Deceglie, MG Silverman, TJ Marion, B Kurtz, SR AF Deceglie, Michael G. Silverman, Timothy J. Marion, Bill Kurtz, Sarah R. GP IEEE TI Real-time series resistance monitoring in PV systems without the need for IV curves SO 2015 IEEE 42ND PHOTOVOLTAIC SPECIALIST CONFERENCE (PVSC) SE IEEE Photovoltaic Specialists Conference LA English DT Proceedings Paper CT IEEE 42nd Photovoltaic Specialist Conference (PVSC) CY JUN 14-19, 2015 CL New Orleans, LA SP IEEE DE Photovoltaic; Reliability; Monitoring; Series resistance AB We apply the physical principles of a familiar method, suns-V-oc, to a new application: the real-time detection of series resistance changes in modules and systems operating outside. The real-time series resistance (RTSR) method that we describe avoids the need for collecting IV curves or constructing full series-resistance-free IV curves. RTSR is most readily deployable at the module level on micro-inverters or module-integrated electronics, but it can also be extended to full strings. Automated detection of series resistance increases can provide early warnings of some of the most common reliability issues, which also pose fire risks, including broken ribbons, broken solder bonds, and contact problems in the junction or combiner box. We describe the method in detail and describe a sample application to data collected from modules operating in the field. C1 [Deceglie, Michael G.; Silverman, Timothy J.; Marion, Bill; Kurtz, Sarah R.] Natl Renewable Energy Lab, Golden, CO 80401 USA. RP Deceglie, MG (reprint author), Natl Renewable Energy Lab, Golden, CO 80401 USA. NR 9 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 0160-8371 BN 978-1-4799-7944-8 J9 IEEE PHOT SPEC CONF PY 2015 PG 4 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE2SX UT WOS:000369992900020 ER PT S AU Dhakal, TP Harvey, S van Hest, M Teeter, G AF Dhakal, Tara P. Harvey, Steve van Hest, Maikel Teeter, Glenn GP IEEE TI Back Contact Band Offset Study of Mo-CZTS Based Solar Cell Structure by Using XPS/UPS Techniques SO 2015 IEEE 42ND PHOTOVOLTAIC SPECIALIST CONFERENCE (PVSC) SE IEEE Photovoltaic Specialists Conference LA English DT Proceedings Paper CT IEEE 42nd Photovoltaic Specialist Conference (PVSC) CY JUN 14-19, 2015 CL New Orleans, LA SP IEEE DE CZTS solar cells; Mo/MoS2 back contact; XPS/UPS analysis AB The back contact issues of Cu2ZnSnS4 (CZTS) solar cells are rarely studied. The conventional back contact layers used for CZTS are molybdenum (Mo) and moly-disulfide (MoS2). In this paper, the band offset at the Mo/MoS2 interface is reported. The Mo/MoS2 interface was formed by annealing Mo foil in a sulfur rich ambient. XPS/UPS spectra were then obtained without exposing the sample to ambient atmosphere. The valence band maxima (VBM) and the core level binding energies were obtained to estimate the band alignment. Our results showed that a Schottky junction was formed at the Mo/MoS2 interface with a barrier height of 0.36eV. The valence band maximum at the interface was 0.84eV and the corresponding band bending was 0.11 eV at the interface. A band diagram of the Mo/MoS2 interface created with these values showed that the formation of MoS2 between Mo and CZTS layer would not be a barrier to the holes at least at the Mo-side of the Mo/MoS2/CZTS interface. C1 [Dhakal, Tara P.] SUNY Binghamton, Dept Elect & Comp Engn, Binghamton, NY 13902 USA. [Dhakal, Tara P.] SUNY Binghamton, Ctr Autonomous Solar Power CASP, Binghamton, NY 13902 USA. [Harvey, Steve; van Hest, Maikel; Teeter, Glenn] Natl Renewable Energy Lab, Golden, CO 80401 USA. RP Dhakal, TP (reprint author), SUNY Binghamton, Dept Elect & Comp Engn, Binghamton, NY 13902 USA.; Dhakal, TP (reprint author), SUNY Binghamton, Ctr Autonomous Solar Power CASP, Binghamton, NY 13902 USA. NR 13 TC 0 Z9 0 U1 2 U2 4 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 0160-8371 BN 978-1-4799-7944-8 J9 IEEE PHOT SPEC CONF PY 2015 PG 4 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE2SX UT WOS:000369992900033 ER PT S AU Doubleday, K Deline, C Olalla, C Maksimovic, D AF Doubleday, Kate Deline, Chris Olalla, Carlos Maksimovic, Dragan GP IEEE TI Performance of Differential Power-Processing Submodule DC-DC Converters in Recovering Inter-Row Shading Losses SO 2015 IEEE 42ND PHOTOVOLTAIC SPECIALIST CONFERENCE (PVSC) SE IEEE Photovoltaic Specialists Conference LA English DT Proceedings Paper CT IEEE 42nd Photovoltaic Specialist Conference (PVSC) CY JUN 14-19, 2015 CL New Orleans, LA SP IEEE DE photovoltaic systems; power electronics; partial shading; energy conversion; power system simulation ID MISMATCHED PV SYSTEMS; ARCHITECTURES AB Large commercial photovoltaic systems suffer a regular and predictable energy loss due to both inter-row shading and reduced diffuse irradiance in tightly spaced arrays. This paper investigates the advantages of replacing bypass diodes with submodule-integrated DC-DC converters (subMICs) to mitigate these losses. Yearly simulations of commercial-scale PV systems were conducted considering two subMIC granularities and a range of row-to-row pitches given either a fixed array size or a fixed land area. Results show subMIC-enhanced systems can recover 35-48% of the total energy loss. In very tightly-spaced arrays, subMICS rated at 100 % of maximum substring power can confer a 7% increase in annual energy output while power limited subMICs rated at 3 0 % or 15% of maximum substring power still provide a 6% or 3-4% increase, respectively. C1 [Doubleday, Kate; Maksimovic, Dragan] Univ Colorado, Boulder, CO 80309 USA. [Deline, Chris] Natl Renewable Energy Lab, Golden, CO 80401 USA. [Olalla, Carlos] Univ Rovira & Virgili, E-43007 Tarragona, Spain. RP Doubleday, K (reprint author), Univ Colorado, Boulder, CO 80309 USA. RI Olalla, Carlos/A-8571-2012 OI Olalla, Carlos/0000-0001-8333-9840 NR 14 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 0160-8371 BN 978-1-4799-7944-8 J9 IEEE PHOT SPEC CONF PY 2015 PG 5 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE2SX UT WOS:000369992903133 ER PT S AU Driesse, A Stein, JS Riley, D Carmignani, C AF Driesse, Anton Stein, Joshua S. Riley, Daniel Carmignani, Craig GP IEEE TI Monitoring Current, Voltage and Power in Photovoltaic Systems SO 2015 IEEE 42ND PHOTOVOLTAIC SPECIALIST CONFERENCE (PVSC) SE IEEE Photovoltaic Specialists Conference LA English DT Proceedings Paper CT IEEE 42nd Photovoltaic Specialist Conference (PVSC) CY JUN 14-19, 2015 CL New Orleans, LA SP IEEE DE photovoltaic systems; monitoring; sampling rate; analog filter; digital filter; decimation ID CLOUD ENHANCEMENT AB Accurate photovoltaic system performance monitoring is critical for profitable long-term operation. Irradiance, temperature, power, current and voltage signals contain rapid fluctuations that are not observable by typical monitoring systems. Nevertheless these fluctuations can affect the accuracy of the data that are stored. We closely examine electrical signals in one operating PV system recorded at 2000 samples per second. Rapid fluctuations are analyzed, caused by line-frequency harmonics, anti-islanding detection, MPPT and others. The operation of alternate monitoring systems is simulated using a wide range of sampling intervals, archive intervals and filtering options to assess how these factors influence final data accuracy. C1 [Driesse, Anton] PV Performance Labs, Freiburg, Germany. [Stein, Joshua S.; Riley, Daniel; Carmignani, Craig] Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Driesse, A (reprint author), PV Performance Labs, Freiburg, Germany. NR 7 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 0160-8371 BN 978-1-4799-7944-8 J9 IEEE PHOT SPEC CONF PY 2015 PG 6 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE2SX UT WOS:000369992900019 ER PT S AU Essig, S Geisz, JF Steiner, MA Merkle, A Peibst, R Schmidt, J Brendel, R Ward, S Friedman, DJ Stradins, P Young, DL AF Essig, Stephanie Geisz, John F. Steiner, Myles A. Merkle, Agnes Peibst, Robby Schmidt, Jan Brendel, Rolf Ward, Scott Friedman, Daniel J. Stradins, Paul Young, David L. GP IEEE TI Development of highly-efficient GaInP/Si Tandem Solar Cells SO 2015 IEEE 42ND PHOTOVOLTAIC SPECIALIST CONFERENCE (PVSC) SE IEEE Photovoltaic Specialists Conference LA English DT Proceedings Paper CT IEEE 42nd Photovoltaic Specialist Conference (PVSC) CY JUN 14-19, 2015 CL New Orleans, LA SP IEEE DE Multijunction solar cells; silicon; III-V semiconductor materials ID SILICON AB Dual-junction solar cells consisting of rear-heterojunction GaInP top cells and back-junction, back-contacted crystalline Si bottom cells were fabricated and characterized. Our calculations show that theoretical efficiencies up to 38.9% can be achieved with Si-based tandem devices. In our experiments, the two subcells were fabricated separately and stacked with an index matching fluid. In contrast to conventional mechanically stacked solar cells, that contain two metal grids at the interface, our concept includes a fully back contacted bottom cell which reduces the shadow losses in the device. A I-sun AM1.5g cumulative efficiency of (26.2 +/- 0.6)% has been achieved with this novel GaInP/Si 4-terminal tandem solar cell. C1 [Essig, Stephanie; Geisz, John F.; Steiner, Myles A.; Ward, Scott; Friedman, Daniel J.; Stradins, Paul; Young, David L.] Natl Renewable Energy Lab, Golden, CO 80401 USA. [Merkle, Agnes; Peibst, Robby; Schmidt, Jan; Brendel, Rolf] Inst Solar Energy Res Hamelin ISFH, D-31860 Emmerthal, Germany. RP Essig, S (reprint author), Natl Renewable Energy Lab, Golden, CO 80401 USA. NR 15 TC 0 Z9 0 U1 2 U2 6 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 0160-8371 BN 978-1-4799-7944-8 J9 IEEE PHOT SPEC CONF PY 2015 PG 4 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE2SX UT WOS:000369992900012 ER PT S AU Faghaninia, A Ager, JW Lo, CS AF Faghaninia, Alireza Ager, Joel W., III Lo, Cynthia S. GP IEEE TI ab initio Electronic Transport Model for Photovoltaics SO 2015 IEEE 42ND PHOTOVOLTAIC SPECIALIST CONFERENCE (PVSC) SE IEEE Photovoltaic Specialists Conference LA English DT Proceedings Paper CT IEEE 42nd Photovoltaic Specialist Conference (PVSC) CY JUN 14-19, 2015 CL New Orleans, LA SP IEEE DE Charge carrier mobility; Conductivity; Computational modeling; Predictive models; Solar energy ID TOTAL-ENERGY CALCULATIONS; WAVE BASIS-SET; BAND-STRUCTURE; GAAS; SEMICONDUCTORS; METALS AB Accurate ab initio electronic transport models facilitate the rapid development in design of new photovoltaic (PV) materials. In order to correctly predict low-field electronic drift mobility and conductivity of semiconductors, we present here an ab initio transport Model in the Boltzmann Transport (aMoBT) framework. Using the relevant inputs from ab initio band structure and density of states of the semiconductor, we calculate electron group velocity, effective mass, orbital hybridization, and phonon frequencies. We then explicitly solve the linearized Boltzmann transport equation (BTE) via Rode's iterative method, to calculate the perturbation to a small electric field and, thus, drift mobility, without the need for experimental data and fitting. We have validated the calculated mobility of GaAs and InN against experimental data and find that the agreement is satisfactory in both the qualitative prediction of changes of mobility with temperature and carrier concentration, as well as the quantitatively predicted values. We believe that this tool facilitates high-throughput density functional theory calculations in search of new PV materials. Furthermore, it offers insight on physical limitations to mobility, including elastic and inelastic scattering mechanisms inside these materials. C1 [Faghaninia, Alireza; Lo, Cynthia S.] Washington Univ, Dept Energy Environm & Chem Engn, St Louis, MO 63130 USA. [Ager, Joel W., III] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA. RP Faghaninia, A (reprint author), Washington Univ, Dept Energy Environm & Chem Engn, St Louis, MO 63130 USA. EM clo@wustl.edu NR 29 TC 0 Z9 0 U1 1 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 0160-8371 BN 978-1-4799-7944-8 J9 IEEE PHOT SPEC CONF PY 2015 PG 4 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE2SX UT WOS:000369992901112 ER PT S AU Faulkner, BR Ohno, TR Burst, JM Duenow, JN Perkins, CL To, B Gessert, TA AF Faulkner, B. R. Ohno, T. R. Burst, J. M. Duenow, J. N. Perkins, C. L. To, B. Gessert, T. A. GP IEEE TI The Effects of Sputtering Target Preparation and Deposition Temperature on ZnTe:Cu Film Properties SO 2015 IEEE 42ND PHOTOVOLTAIC SPECIALIST CONFERENCE (PVSC) SE IEEE Photovoltaic Specialists Conference LA English DT Proceedings Paper CT IEEE 42nd Photovoltaic Specialist Conference (PVSC) CY JUN 14-19, 2015 CL New Orleans, LA SP IEEE DE ZnTe contact interface; ZnTe:Cu; sputtering target; substrate deposition temperature; CdTe ID SOLAR-CELLS; THIN-FILMS; CONTACT AB A back contact containing a sputtered ZnTe:Cu interface layer can produce high-performing thin-film CdS/CdTe photovoltaic devices. We have found that varying the ZnT:Cu sputtering target fabrication processes and deposition temperature can affect material properties of the ZnTe: Cu films and the resulting device performance. Two different target "recipes" with various copper contents we. re used to study changes in the compositional, structural, optical, and electrical properties of ZnTe: Cu films. Substrate temperature during deposition was also varied to investigate the temperature dependence of the films. It was found that the target recipe, Cu concentration in the target, and deposition temperature affect the composition of the ZnTe: Cu films, which impacts their structural, optical, and electrical properties. C1 [Faulkner, B. R.; Ohno, T. R.] Colorado Sch Mines, Golden, CO 80401 USA. [Burst, J. M.; Duenow, J. N.; Perkins, C. L.; To, B.; Gessert, T. A.] Natl Renewable Energy Lab, Golden, CO 80401 USA. RP Faulkner, BR (reprint author), Colorado Sch Mines, Golden, CO 80401 USA. NR 15 TC 0 Z9 0 U1 1 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 0160-8371 BN 978-1-4799-7944-8 J9 IEEE PHOT SPEC CONF PY 2015 PG 6 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA BE2SX UT WOS:000369992902057 ER EF