FN Thomson Reuters Web of Science™ VR 1.0 PT B AU Tsoupas, N Ahrens, L Brown, K Chiang, IH Gardner, CJ MacKay, WW Pile, P Rusek, A AF Tsoupas, N. Ahrens, L. Brown, K. Chiang, I-Hung Gardner, C. J. MacKay, W. W. Pile, P. Rusek, A. GP IEEE TI Uniform beam distributions at the target of the NSRL beam transfer line SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Uniform irradiation of biological or material samples with charged particle beams is desired by experimenters because it reduces radiation dose errors. In this paper we present results of uniform beams produced in the NASA SPACE RADIATION LABORATORY (NSRL) at the Brookhaven National Laboratory (BNL) by a method which was developed theoretically and was proven experimentally [1,2,3] at BNL. A similar method which requires collimation of the beam, and also lacks the flexibility of the present method to produce beam various beam sizes at the target, was patented[4] in the year 1988. The present method of producing uniform beam distributions on a plane transverse to the direction of the beam, is based on purely magnetic focusing of the beam and requires no collimation of the beam or any other type of beam interaction with materials. It can also generate uniform beam distributions of various sizes. The method is favorably compared with alternative methods [5] of producing uniform beam distributions and can be applied to the whole energy spectrum of the charged particle beams that are delivered by the BNL Booster synchrotron. C1 [Tsoupas, N.; Ahrens, L.; Brown, K.; Chiang, I-Hung; Gardner, C. J.; MacKay, W. W.; Pile, P.; Rusek, A.] Brookhaven Natl Lab, Upton, NY 11973 USA. RP Tsoupas, N (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. EM tsoupas@bnl.gov NR 8 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 1939 EP 1941 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302115 ER PT B AU Tsoupas, N Ahrens, L Alforque, R Bai, M Brown, K Courant, E Glenn, J Huang, H Jain, A MacKay, WW Okamura, M Roser, T Tepikian, S AF Tsoupas, N. Ahrens, L. Alforque, R. Bai, M. Brown, K. Courant, E. Glenn, J. Huang, H. Jain, A. MacKay, W. W. Okamura, M. Roser, T. Tepikian, S. GP IEEE TI Design of a thin quadrupole to be used in the AGS synchrotron SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The Alternating Gradient Synchrotron (AGS) employs two partial helical snakes[1] to preserve the polarization of the proton beam during acceleration. In order to compensate for the focusing effect of the partial helical snakes on the beam optics in the AGS during acceleration of the beam, we introduced eight quadrupoles in straight sections of the AGS at the proximity of the partial snakes. At injection energies, the strength of each quad is set at a high value, and is ramped down to zero as the effect of the snakes diminishes by the square of beam's rigidity. Four of the eight compensation quadrupoles had to be placed in very short straight sections similar to 30 cm in length, therefore the quadupoles had be thin with an overall length of less than 30 cm. In this paper we will discus: a) the mechanical and magnetic specifications of the "thin" quadrupole. b) the method to minimize the strength of the dodecapole harmonic, c) the method to optimize the thickness of the laminations that the magnet iron is made, d) mechanical tolerances of the magnet, e) comparison of the measured and calculated magnetic multipoles of the quadrupole. C1 [Tsoupas, N.; Ahrens, L.; Alforque, R.; Bai, M.; Brown, K.; Courant, E.; Glenn, J.; Huang, H.; Jain, A.; MacKay, W. W.; Okamura, M.; Roser, T.; Tepikian, S.] Brookhaven Natl Lab, Upton, NY 11973 USA. RP Tsoupas, N (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. EM tsoupas@bnl.gov 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 1942 EP 1944 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302116 ER PT B AU Wang, G Blaskiewicz, M AF Wang, G. Blaskiewicz, M. GP IEEE TI Simulations of rhic coherent stabilities due to wakefield and electron cooling SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The Electron cooling beam has both coherent and incoherent effects to the circulating ion beam. The incoherent longitudinal cooling could reduce the ion beam energy spread and hence cause 'over-cooling' of the ion beam. Depending on the beam densities and cooling length, the coherent interaction between the ion and electron beam could either damp or anti-damp the ion coherent motions. Using the tracking codes, TRANFT, the threshold for 'over-cooling' has been found and compared with theoretical estimation. The transverse coherent effect of electron cooling has been implemented into the codes and its effect for the bunched ion beam is shown. C1 [Wang, G.; Blaskiewicz, M.] Brookhaven Natl Lab, Upton, NY 11973 USA. RP Wang, G (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. EM gawang@bnl.gov 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 1945 EP 1947 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302117 ER PT B AU Conte, M Luccio, AU MacKay, WW Pusterla, M AF Conte, M. Luccio, A. U. MacKay, W. W. Pusterla, M. GP IEEE TI Stern-Gerlach force on a precessing magnetic moment SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Use of the Stem-Gerlach force for attaining the spin-states separation of a particle beam is reconsidered in a new method where the magnetic moments are made to precess, at variance with a previously considered case where the magnetic moment conserves its direction in space. C1 [Conte, M.] Univ Genoa, Ist Nazl Fis Nucl, Genoa, Italy. [Luccio, A. U.; MacKay, W. W.] Brookhaven Natl Lab, Upton, NY USA. [Pusterla, M.] Univ Padua, Ist Nazl Fis Nucl, Padua, Italy. RP Conte, M (reprint author), Univ Genoa, Ist Nazl Fis Nucl, Genoa, Italy. FU INFN of Italy; U.S. DOE FX Work supported by INFN of Italy and by the U.S. DOE 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 1948 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302118 ER PT B AU Napoly, O Delferriere, O Durante, M Payet, J Rippon, C Uriot, D Balhan, B Borburgh, J Goddard, B Kuroda, S Iwashita, Y Alabau, MD Bambade, P Brossard, J Dadoun, O Rimbault, C Sabbi, G Keller, L Angal-Kalinin, D Jackson, F Tzenov, S Appleby, R AF Napoly, O. Delferriere, O. Durante, M. Payet, J. Rippon, C. Uriot, D. Balhan, B. Borburgh, J. Goddard, B. Kuroda, S. Iwashita, Y. Alabau, M. del Carmen Bambade, P. Brossard, J. Dadoun, O. Rimbault, C. Sabbi, G. Keller, L. Angal-Kalinin, D. Jackson, F. Tzenov, S. Appleby, R. GP IEEE TI Technical challenges for head-on collisions and extraction at the ILC SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB An interaction region with head-on collisions is considered as an alternative to the baseline ILC configuration. Progress in the final focus optics design includes engineered large bore superconducting final doublet magnets and their 3D magnetic integration in the detector solenoids. Progress on the beam separation optics is based on technical designs of electrostatic separator and special extraction quadrupoles. The spent beam extraction is realized by a staged collimation scheme relying on realistic collimators. C1 [Napoly, O.; Delferriere, O.; Durante, M.; Payet, J.; Rippon, C.; Uriot, D.] CEA, Gif Sur Yvette, France. [Balhan, B.; Borburgh, J.; Goddard, B.] CERN, CH-1211 Geneva 23, Switzerland. [Kuroda, S.] KEK, Ibaraki, Japan. [Iwashita, Y.] Kyoto Inst Technol, Kyoto, Japan. [Alabau, M. del Carmen; Bambade, P.; Brossard, J.; Dadoun, O.; Rimbault, C.] Lab Accelerateur Lineaire, Orsay, France. [Sabbi, G.] Lawrence Berkeley Natl Lab, Berkeley, CA USA. [Keller, L.] Stanford Linear Accelerator Ctr, Menlo Pk, CA USA. [Angal-Kalinin, D.; Jackson, F.; Tzenov, S.] Daresbury Lab, STFC, ASTeC, Warrington, Cheshire, England. [Appleby, R.] Univ Manchester, Manchester, Lancs, England. RP Napoly, O (reprint author), CEA, Gif Sur Yvette, France. EM olivier..napoly@cea.fr FU EC [011899 RIDS] FX Work supported by the EC under the FP6 Research Infrasctructure Action - Structuring the European Research Area EUROTeV DS Project Contract no.011899 RIDS 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 1960 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302122 ER PT B AU Hartin, A Burrows, P Christian, G Clarke, C Constance, B Khah, H Perry, C Swinson, C Arnold, R Molloy, S Smith, S White, G Woods, M Kalinin, A AF Hartin, A. Burrows, P. Christian, G. Clarke, C. Constance, B. Khah, H. Perry, C. Swinson, C. Arnold, R. Molloy, S. Smith, S. White, G. Woods, M. Kalinin, A. GP IEEE TI Simulation of ILC feedback BPM signals in an intense background environment SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Experiment T-488 at SLAC, End Station A recorded distorted BPM voltage signals and an. accurate simulation of these signals was performed. Geant simulations provided the energy and momentum spectrum of the incident spray and secondary emissions, and a method via image charges was used to convert particle momenta and number density into BPM stripline currents. Good agreement was achieved between simulated and measured signals. Further simulation of experiment T-488 with incident beam on axis and impinging on a thin radiator predicted minimal impact due to secondary emission. By extension to worst case conditions expected at the ILC, simulations showed that background hits on BPM striplines would have a negligible impact on the accuracy of beam position measurements and hence the operation of the FONT feedback system. C1 [Hartin, A.; Burrows, P.; Christian, G.; Clarke, C.; Constance, B.; Khah, H.; Perry, C.; Swinson, C.] Oxford Univ Phys, John Adams Inst, Oxford OX1 3RH, England. [Arnold, R.; Molloy, S.; Smith, S.; White, G.; Woods, M.] Stanford Linear Accelerator Ctr, Menlo Pk, CA USA. [Kalinin, A.] CCLRC, ASTeC Darebury Lab, Warrington, Cheshire, England. RP Hartin, A (reprint author), Oxford Univ Phys, John Adams Inst, Oxford OX1 3RH, England. RI swinson, christina/C-6782-2012 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2133 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302180 ER PT B AU Antipov, S Spentzouris, LK Conde, M Gai, W Power, JG Yusof, Z Dolgashev, V AF Antipov, S. Spentzouris, L. K. Conde, M. Gai, W. Power, J. G. Yusof, Z. Dolgashev, V. GP IEEE TI Proposed dark current studies at the Argonne wakefield accelerator facility SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB A study of dark currents has been initiated at the Argonne Wakefield Accelerator Facility (AWA). Emission of dark current is closely related to a breakdown. Breakdown may include several factors such as local field enhancement, explosive electron emission, Ohmic heating, tensile stress produced by electric field, and others. The AWA is building a dedicated facility to test various models for breakdown mechanisms and to determine the roles of different factors in the breakdown. An imaging system is being put together to identify single emitters on the cathode surface. This will allow us to study dark current properties in the gun. We also plan to trigger breakdown events with a high-powered laser at various wavelengths (IR to UV). Another experimental idea follows from the recent work on a Schottky-enabled photoemission in an RF photoinjector that allows us to determine in situ the field enhancement factor on a cathode surface. Monitoring the field enhancement factor before and after can shed some light on a modification of metal surface after the breakdown. C1 [Antipov, S.; Spentzouris, L. K.] IL Inst Technol, Chicago, IL 60616 USA. [Conde, M.; Gai, W.; Power, J. G.; Yusof, Z.] Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. [Dolgashev, V.] SLAC, Menlo Pk, CA 94025 USA. RP Antipov, S (reprint author), IL Inst Technol, Chicago, IL 60616 USA. FU National Science Foundation [0237162]; [DE-AC02-06CH11357] FX The submitted paper has been created by UChicago Argonne, LLC, Operator of Argonne National Laboratory (Argonne). Arg onne, a U.S. Department of Energy Office of Science laboratory, is operated under Contract No. DE-AC02-06CH11357.; This work is also supported by the National Science Foundation grant # 0237162 NR 5 TC 0 Z9 0 U1 1 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2148 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302185 ER PT B AU Antipov, S Spentzouris, LK Conde, M Gai, W Liu, W Konecny, R Power, JG Yusof, Z AF Antipov, S. Spentzouris, L. K. Conde, M. Gai, W. Liu, W. Konecny, R. Power, J. G. Yusof, Z. GP IEEE TI Metamaterial-loaded waveguides for accelerator applications SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Metamaterials, (MTM) are artificial periodic structures made of small elements and designed to obtain specific electromagnetic properties. As long as the periodicity and the size of the elements are much smaller than the wavelength of interest, an artificial structure can be described by a permittivity and permeability, just like natural materials. Metamaterials can be customized to have the permittivity and permeability desired for a particular application. Waveguides loaded with metamaterials are of interest because the metamaterials can change the dispersion relation of the waveguide significantly. Slow backward waves, for example, can be produced in an LHM-loaded waveguide without corrugations. In this paper we present theoretical studies and computer modeling of waveguides loaded with 2D anisotropic metamaterials, including the dispersion relation for a MTM-loaded waveguide. The dispersion relation of a MTM-loaded waveguide has several interesting frequency bands which are described. It is shown theoretically that dipole mode suppression may be possible. Therefore, metamaterials can be used to suppress wakefields in accelerating structures. C1 [Antipov, S.; Spentzouris, L. K.] IIT, Chicago, IL 60616 USA. [Conde, M.; Gai, W.; Liu, W.; Konecny, R.; Power, J. G.; Yusof, Z.] Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. RP Antipov, S (reprint author), IIT, Chicago, IL 60616 USA. FU National Science Foundation [0237162]; [DE-AC02-06CH11357] FX The submitted paper has been created by UChicago Argonne, LLC, Operator of Argonne National Laboratory (Argonne). Argonne, a U.S. Department of Energy Office of Science laboratory, is operated under Contract No. DE-AC02-06CH11357.; This work is also supported by the National Science Foundation grant # 0237162. NR 14 TC 0 Z9 0 U1 1 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2150 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302186 ER PT B AU Antipov, S Spentzouris, LK Gai, W Liu, W AF Antipov, S. Spentzouris, L. K. Gai, W. Liu, W. GP IEEE TI Simulations of the rotating positron target in the presence of OMD field SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB For an International Linear Collider (ILC) undulator-based positron source target configuration, a strong optical matching device (OMD) field is needed inside the target to increase the positron yield (by more than 40%) [1]. It is also required that the positron target is constantly rotated to reduce thermal and radiation damage. We report on a simulation of the rotating metal target wheel under a strong magnetic field. By rearranging Maxwell's equations for a rotating frame and using Comsol [5], we have solved the detailed magnetic field distribution and eddy current of a rotating metal disk in magnetic field, and so the required power to drive the target wheel. In order to validate the simulation process, we have compared our results with previous experimental data [2] and found they are in very good agreement. Here we give detailed results on the proposed ILC target system, such as induced magnetic field (dipole and higher orders), eddy current distribution and the driving force requirements. The effect of these higher order fields on the positron beam dynamics is also considered. C1 [Antipov, S.; Spentzouris, L. K.] Il Inst Technol, Chicago, IL 60616 USA. [Gai, W.; Liu, W.] Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. RP Antipov, S (reprint author), Il Inst Technol, Chicago, IL 60616 USA. FU National Science Foundation [0237162]; [DE-AC02-06CH11357] FX The submitted paper has been created by UChicago Argonne, LLC, Operator of Argonne National Laboratory (Argonne). Argonne, a U.S. Department of Energy Office of Science laboratory, is operated under Contract No. DE-AC02-06CH11357.; This work is also supported by the National Science Foundation grant # 0237162. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2153 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302187 ER PT B AU Gao, F Conde, M Gai, W Konecny, R Liu, W Power, J Yusof, Z Wong, T Jing, C AF Gao, F. Conde, M. Gai, W. Konecny, R. Liu, W. Power, J. Yusof, Z. Wong, T. Jing, C. GP IEEE TI C-band high power RF generation and extraction using a dielectric loaded waveguide SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE ID ACCELERATOR AB We report on design, fabrication, and beam test of a 7.8GHz power extractor recently conducted at the Argonne Wakefield Accelerator (AWA) facility. The wakefields are excited using an electron beam travels through a dielectric loaded waveguide, and the generated RF power is then subsequently extracted with a properly designed RF coupler. In the experiment, 30MW of output power is excited by a 66nC single electron bunch, and wakefield superposition by a train consisting of four bunches is also demonstrated. Both results agree very well with theoretical predictions. Future tests include more charge transmission for higher RF power, and more bunches in a train for longer RF pulses. C1 [Gao, F.; Conde, M.; Gai, W.; Konecny, R.; Liu, W.; Power, J.; Yusof, Z.] Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. [Wong, T.] IIT, Chicago, IL USA. [Jing, C.] Eculid TechLabs, LLC, Cleveland, OH USA. RP Gao, F (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. EM fgao@hep.an1.gov FU US Department of Energy [W-31-109-ENG-38] FX Work supported by the US Department of Energy under contract No. W-31-109-ENG-38. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2156 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302188 ER PT B AU Konkashbaev, I Fischer, P Hassanein, A Mokhov, NV AF Konkashbaev, I. Fischer, P. Hassanein, A. Mokhov, N. V. GP IEEE TI Enhancement of heat removal using concave liquid metal targets for high-power accelerators SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The need is increasing for development of high-power targets and beam dump areas for the production of intense beams of secondary particles. The severe constraints arising from a megawatt beam deposited on targets and absorbers call for nontrivial procedures to dilute the beam. This study describes the development of targets and absorbers and the advantages of using flowing liquid metal in concave channels first proposed by IFMIF to raise the liquid metal boiling point by increasing the pressure in liquid supported by a centrifugal force. Such flow with a back-wall is subject to Taylor-Couette instability. The instability can play a positive role of increasing the heat transfer from the hottest region in the target/absorber to the back-wall cooled by water. Results of theoretical analysis and numerical modeling of both targets and dump areas for the IFMIF, ILC, and RIA facilities are presented. C1 [Konkashbaev, I.; Fischer, P.; Hassanein, A.] Argonne Natl Lab, Argonne, IL 60439 USA. [Mokhov, N. V.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Konkashbaev, I (reprint author), Argonne Natl Lab, Argonne, IL 60439 USA. FU U.S. Dept. of Energy [DE-AC02-06CH11357] FX This work was supported by the U.S. Dept. of Energy, under Contract DE-AC02-06CH11357. The calculations were performed using the Flash code. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2159 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302189 ER PT B AU Liu, WM Gai, W Kim, KJ AF Liu, Wanming Gai, Wei Kim, Kwang-Je GP IEEE TI Systematic study of the undulator based ILC positron source: production and capture SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB A systematic study of the positron production and capturing yield for the undulatoer-based ILC positron source has been performed. We use undulator parameters of k-=0.3 - 1, lambda=0.7 - 1.5 cm as the reference design. The yield is defined as number of positrons captured at the damping ring input by a single electron passing through 100 meter long undulator. Several scenarios for polarizations and capturing schemes are considered here: polarized (60%) and low-polarized positrons, immersed target in magnetic field and non-immersed cases. C1 [Liu, Wanming; Gai, Wei; Kim, Kwang-Je] Argonne Natl Lab, Argonne, IL 60439 USA. RP Liu, WM (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. EM wmliu@hep.anl.gov 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2162 EP 2164 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302190 ER PT B AU Long, J Chemerisov, S Gai, W Jonah, CD Liu, W Wang, H AF Long, J. Chemerisov, S. Gai, W. Jonah, C. D. Liu, W. Wang, H. GP IEEE TI Study on high flux accelerator based positrons source SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE ID MODERATOR AB Present accelerator-based slow-positron technology impinge the positrons coming out of a conversion target on a thin foil of metal (moderator) where the positrons are thermalized and then ejected from the moderator with the surface work energy of the material. This study represents a new direction in developing accelerator-based high-intensity slow-positron sources. We investigate the use of RF fields to decelerate the positrons out of the target. Techniques, such as a Penning trap or moderation can then be used to get the needed thermal positrons with higher yield. Using a relatively simple beam-line scheme, our preliminary simulations showed that it could increase the final thermal positrons yield by more than 20 times. This suggests a promising future for this new method. C1 [Long, J.; Chemerisov, S.; Gai, W.; Jonah, C. D.; Liu, W.; Wang, H.] Argonne Natl Lab, Argonne, IL 60439 USA. RP Long, J (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. EM long@anl.gov NR 7 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2165 EP 2167 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302191 ER PT B AU Wang, HT Liu, WM Gai, W Wong, T Kanareykin, A AF Wang, Haitao Liu, Wanming Gai, Wei Wong, Thomas Kanareykin, Alex GP IEEE TI Design and prototyping of the amd for the ILC SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB An Adiabatic Matching Device (AMD), which generates a tapered magnetic field with initial on-axis field up to 5 Tesla, is required in ILC positron capturing optics. A proposed scheme is to use a pulsed normal conducting flux concentrator to generate the strong magnetic field. By varying the inner shape of a flux concentrator, one can shape the on-axis magnetic field profile of the AMD. In this paper, we present an equivalent circuit model of a pulsed flux concentrator based on frequency domain analysis. We have constructed a prototype flux concentrator based on the circuit model, and experimental results are presented to validate the model. Using the equivalent circuit model, a flux concentrator based AMD is designed for the ILC positron matching. The beam capturing simulation results using the designed AMD are presented in this paper. C1 [Wang, Haitao; Liu, Wanming; Gai, Wei] Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. [Wang, Haitao; Wong, Thomas] IIT, Chicago, IL 60616 USA. [Kanareykin, Alex] Euclid TechLabs, LLC, Cleveland, OH 44139 USA. RP Wang, HT (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. FU US Department of Energy Office of Science [DE-AC02-06CH11357] FX Work supported by the US Department of Energy Office of Science under Contract No. DE-AC02-06CH11357. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2168 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302192 ER PT B AU Newsham, D Johnson, RP Sah, R Bogacz, SA Chao, YC Derbenev, Y AF Newsham, David Johnson, Rolland P. Sah, Richard Bogacz, S. Alex Chao, Yu-Chiu Derbenev, Yaroslav GP IEEE TI Simulations of parametric-resonance ionization cooling SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Parametric-resonance ionization cooling (PIC) is a muon-cooling technique that is useful for low-emittance muon colliders. This method requires a well-tuned focusing channel that is free of chromatic and spherical aberrations. In order to be of practical use in a muon collider, it also necessary that the focusing channel be as short as possible to minimize muon loss due to decay. G4Beamline numerical simulations are presented of a compact PIC focusing channel in which spherical aberrations are minimized by using design symmetry. C1 [Newsham, David; Johnson, Rolland P.; Sah, Richard] Muons Inc, Batavia, IL 60510 USA. [Bogacz, S. Alex; Chao, Yu-Chiu; Derbenev, Yaroslav] Jefferson Lab, Newport News, VA USA. RP Newsham, D (reprint author), Muons Inc, Batavia, IL 60510 USA. EM newsh@muonsinc.com FU DOE SBIR [DE-FG02-04ER84016] FX Work supported by DOE SBIR grant DE-FG02-04ER84016. 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 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2171 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302193 ER PT B AU Johnson, RP Ankenbrandt, C Bhat, C Popovic, M Bogacz, SA Derbeney, Y AF Johnson, Rolland P. Ankenbrandt, Charles Bhat, Chandra Popovic, Milorad Bogacz, S. Alex Derbeney, Yaroslav GP IEEE TI Muon bunch coalescing SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The idea of coalescing multiple muon bunches at high energy to enhance the luminosity of a muon collider provides many advantages. It circumvents space-charge, beam loading, and wakefield problems of intense low-energy bunches while restoring the synergy between muon colliders and neutrino factories based on muon storage rings. A sampling of initial conceptual design work for a coalescing ring is presented here. C1 [Johnson, Rolland P.] Muons Inc, Batavia, IL 60510 USA. [Ankenbrandt, Charles; Bhat, Chandra; Popovic, Milorad] Fermilab Natl Accelerator Lab, Batavia, IL USA. [Bogacz, S. Alex; Derbeney, Yaroslav] Jefferson Lab, Newport, RI USA. RP Johnson, RP (reprint author), Muons Inc, Batavia, IL 60510 USA. EM rol@muonsinc.gov FU DOE STTR [DE-FG02-05ER86253] FX Supported in part by DOE STTR grant DE-FG02-05ER86253. 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 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2174 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302194 ER PT B AU Cummings, MAC Johnson, RP Ankenbrandt, C Yonehara, K AF Cummings, Mary Anne Clare Johnson, Rolland P. Ankenbrandt, Charles Yonehara, Katsuya GP IEEE TI Stopping muon beams SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The study of rare processes using stopping muon beams provides access to new physics that cannot be addressed at energy frontier machines. The flux of muons into a small stopping target is limited by the production process and by stochastic processes in the material used to slow the particles. Innovative muon beam cooling techniques are being applied to the design of stopping muon beams in order to increase the event rates in such experiments. Intense stopping muon beams will also aid the development of applications such as muon spin resonance and muon-catalyzed fusion. C1 [Cummings, Mary Anne Clare; Johnson, Rolland P.; Ankenbrandt, Charles] Muons Inc, Batavia, IL 60510 USA. [Yonehara, Katsuya] Fermilab Natl Accelerator Lab, Batavia, IL USA. RP Cummings, MAC (reprint author), Muons Inc, Batavia, IL 60510 USA. EM macc@muonsinc.com FU DOE SBIR [DE-FG02-03ER83722] FX Supported in part by DOE SBIR grant DE-FG02-03ER83722. 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 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2177 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302195 ER PT B AU Bhat, CM Carneiro, JP Fliller, RR Kazakevich, G Ruan, J Santucci, J AF Bhat, C. M. Carneiro, J. -P Fliller, R. R. Kazakevich, G. Ruan, J. Santucci, J. GP IEEE TI Envelope and multi-slit emittance measurements at Fermilab A0-Photoinjector and comparison with simulations SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Recently we have measured the envelope and the transverse emittance of an 0.85 nC electron beam at the Fermilab A0-Photoinjector facility. The transverse emittarice measurement was performed using the multi-slit method. The data have been taken with an unstacked 2.8 ps laser pulse. In this paper we report on these beam measurements and compare the results with the predictions from beam dynamics codes ASTRA and GPT using 3D space charge routines. C1 [Bhat, C. M.; Carneiro, J. -P; Fliller, R. R.; Kazakevich, G.; Ruan, J.; Santucci, J.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Bhat, CM (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM cbhat@fnal.gov; carneiro@fnal.gov 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2180 EP 2182 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302196 ER PT B AU Church, MD Chen, AZ Mokhov, NV Nagaitsev, S Nakao, N AF Church, M. D. Chen, A. Z. Mokhov, N. V. Nagaitsev, S. Nakao, N. GP IEEE TI Modeling and design of the ILC test area beam absorbers at fermilab SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Detailed MARS 15 simulations have been performed on energy deposition and shielding of the proposed ILC Test Area absorbers. It is designed for up to 50 kW of 800-MeV electron beam power and provides unlimited occupancy conditions in the experimental hall. ANSYS analysis based on the calculated energy deposition maps confirms robustness of the proposed design of the absorbers and beam windows for normal operation and for various failure modes. C1 [Church, M. D.; Chen, A. Z.; Mokhov, N. V.; Nagaitsev, S.; Nakao, N.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Church, MD (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM nakao@fnal.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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2183 EP 2185 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302197 ER PT B AU Church, M Nagaitsev, S Piot, P AF Church, M. Nagaitsev, S. Piot, P. GP IEEE TI Plans for a 750 MeV electron beam test facility at Fermilab SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB A 750 MeV electron beam test facility at Fermilab is in the planning and early construction phase. An existing building is being converted for this facility. The photoinjector currently in use at the Fermilab NICADD Photoinjector Laboratory (FNPL) will be moved to the new facility and upgraded to serve as an injector for a beam acceleration section consisting of three TTF or ILC-type RF cryomodules. A low energy off-axis beamline will be constructed to test ILC crab cavity designs and provide opportunities for other tests. Downstream beamlines will consist of a diagnostic section, a beam test area for additional beam experiments, and high power beam dumps. The initial program for this facility will concentrate on testing ILC-type cryomodules and RF control with full ILC beam intensity. A future building expansion will open up further possibilities for beam physics and beam technology experiments. C1 [Church, M.; Nagaitsev, S.] Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. [Piot, P.] Northern Illinois Univ, De Kalb, IL 60115 USA. RP Church, M (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM church@fnal.gov FU Fermi Research Alliance LLC. [DE-AC02- 07CH11359]; U.S. DOE FX Work supported by Fermi Research Alliance LLC. Under DE-AC02- 07CH11359 with the U.S. DOE. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2186 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302198 ER PT B AU Drozhdin, AI Mokhov, NV Nakao, N Striganov, SI Keller, L AF Drozhdin, A. I. Mokhov, N. V. Nakao, N. Striganov, S. I. Keller, L. GP IEEE TI Suppression of muon backgrounds generated in the ILC beam delivery system SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Muon background suppression at the ILC collider detectors was studied by MARS 15 Monte Carlo simulation with a detailed description of the ILC BDS beam line and tunnel of 1.6-km length. Muon suppressions of about 1/5 and 1/50 were obtained for the donut- and wall-shape muon-spoilers, respectively. C1 [Drozhdin, A. I.; Mokhov, N. V.; Nakao, N.; Striganov, S. I.] Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. [Keller, L.] SLAC, Stanford, CA 94025 USA. RP Drozhdin, AI (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM nakao@fnal.gov FU U.S. Department of Energy [DE-AC02-07CH11359]; Fermi Research Alliance, LLC. FX Work supported by Fermi Research Alliance, LLC, under contract No. DE-AC02-07CH11359 with the U.S. Department of Energy. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2189 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302199 ER PT B AU Jansson, A Balbekov, V Broemmelsiek, D Hu, M Mokhov, NV Yonehara, K AF Jansson, A. Balbekov, V. Broemmelsiek, D. Hu, M. Mokhov, N. V. Yonehara, K. GP IEEE TI A muon beam for cooling experiments SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Within the framework of the Fermilab Muon Collider Task Force, the possibility of developing a dedicated muon test beam for cooling experiments has been investigated. Cooling experiments can be performed in a very low intensity ration beam by tracking single particles through the cooling device. With sufficient muon intensity and large enough cooling decrement, a cooling demonstration experiment may also be performed without resolving single particle trajectories, but rather by measuring the average size and position of the beam. This allows simpler, and thus cheaper, detectors and readout electronics to be used. This paper discusses muon production using 400MeV protons from the Linac, decay channel and beamline design, as well as the instrumentation required for such an experiment, in particular as applied to testing the Helical Cooling Channel (HCC) proposed by Muons Inc. C1 [Jansson, A.; Balbekov, V.; Broemmelsiek, D.; Hu, M.; Mokhov, N. V.; Yonehara, K.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Jansson, A (reprint author), Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2192 EP 2194 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302200 ER PT B AU Johnstone, C Koscielniak, S AF Johnstone, C. Koscielniak, S. GP IEEE TI New nonscaling FFAG for medical applications SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB A hybrid design for a Fixed-Field Alternating-Gradient (FFAG) accelerator has been invented which uses edge and alternating-gradient focusing principles applied in a specific configuration to a combined-function (CF) magnet to stabilize tunes through an acceleration cycle which extends over a factor of 6 in momentum. Using normal conducting magnets, the final, extracted energy from this machine can attain slightly more than 400 MeV/nucleon without the use of superconducting elements. By using fixed-fields, the machine proposed here has the high current advantage of the cyclotron yet retains important features of the synchrotron: smaller radial aperture, variable energy, and both kicker-based and resonant extraction. This machine, without modification, supports a proton and a carbon ion beam in the energy range of interest for cancer therapy. Competing machines for this application include superconducting cyclotrons[1], synchrotrons [2], and, more recently, scaling FFAGs. As such this machine represents a broad innovation in therapy machines. C1 [Johnstone, C.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. [Koscielniak, S.] TRIUMF, Vancouver 60439, BC, Canada. RP Johnstone, C (reprint author), Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. EM cjj@fnal.gov FU Universities Research Association, Inc.; U.S. Department of Energy [DE-AC02-76CH00300]; National Research Council of Canada FX Work supported by the Universities Research Association, Inc., under contract DE-AC02-76CH00300 with the U.S. Department of Energy. TRIUMF receives federal funding via a contribution agreement through the National Research Council of Canada. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2195 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302201 ER PT B AU Lebrun, PLG Michelotti, L Ostiguy, JF AF Lebrun, Paul L. G. Michelotti, Leo Ostiguy, Jean-Frangois GP IEEE TI Recent studies of Dispersion Matched Steering for the ILC bunch compressor and main linac SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The Dispersion Matched Steering (DMS) method is studied in detail in the context of a curved main linac. In the absence of cavity tilts (rotations in the YZ plane), DMS provides a unique and stable solution with negligible emittance growth. If cavity tilts are about 300 mu rad, the algorithm is not very robust. The emittance growth through the entire linac for positrons is about 5 nm, if the system is strictly static and statistical averaging can be used to improve beam position measurements. This growth is mostly eliminated if the dispersion and its derivative at injection can be adjusted. If anticipated ground motion, beam and klystron jitter, beam position measurement resolution are introduced (i.e. dynamical case), the emittance preservation goal is currently not achieved by DMS alone. Mitigation strategies are outlined. C1 [Lebrun, Paul L. G.; Michelotti, Leo; Ostiguy, Jean-Frangois] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Lebrun, PLG (reprint author), Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. EM lebrun@fnal.gov 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2198 EP 2200 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302202 ER PT B AU Neuffer, D Yoshikawa, C Johnson, R AF Neuffer, D. Yoshikawa, C. Johnson, R. GP IEEE TI Use of harmonics in RF cavities in muon capture for a neutrino factory or muon collider SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Common to various front end designs for a muon collider or neutrino factory are costly low frequency RF cavities used to bunch muons. In this paper we show that adding higher harmonic RF cavities to the bunching section of a muon capture channel can provide as good or better bunching efficiency than the case where only the fundamental is used. Since higher harmonic cavities are less expensive to build and operate, this approach implies significant cost savings. C1 [Neuffer, D.; Yoshikawa, C.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. [Johnson, R.] Muons Inc, Batavia, IL 60510 USA. RP Neuffer, D (reprint author), Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. FU DOE STTR [DE-FG02-05ER86252] FX Supported in part by DOE STTR grant DE-FG02-05ER86252 . 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2201 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302203 ER PT B AU Solyak, N Ranjan, K AF Solyak, Nikolay Ranjan, Kirti GP IEEE TI Study of emittance bumps in the ILC main linac SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB We present a first look at simulation results of emittance bumps implemented to preserve the emittance growth in the main linac of the proposed International Linear Collider (ILC). It is found that global orbit bumps used as a static tuning option after dispersion free steermig can be extremely beneficial in further limiting the emittance growth in the main linac. Two kinds of emittance bumps, dispersion and wakefield, are studied in the present study. The effect of varying the location of these bumps along the main linac and the number of these bumps are studied. The influence of combining these bumps on the emittance growth is also discussed. C1 [Solyak, Nikolay; Ranjan, Kirti] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Solyak, N (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM solyak@fng.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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2204 EP 2206 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302204 ER PT B AU Ranjan, K Solyak, N Ivanov, V Mishra, S AF Ranjan, Kirti Solyak, Nikolay Ivanov, Valenin Mishra, Shekhar GP IEEE TI Study of adaptive alignment as beam based alignment in ILC main linac in the presence of ground motion SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB In this work we present simulation results on the effect of ground motion on the main linac performance of the proposed International Linear Collider (ILC), and then use adaptive alignment (AA) technique to correct it. The adaptive alignment technique is investigated for the ELC main linac and its limitations are studied. Then ground motion studies are performed using the simulation program LIAR and the beneficial effects of implementing AA algorithm are further discussed. C1 [Ranjan, Kirti; Solyak, Nikolay; Ivanov, Valenin; Mishra, Shekhar] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Ranjan, K (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM solyak@fnal.gov 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2207 EP 2209 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302205 ER PT B AU Valishev, A Solyak, N Woodley, M AF Valishev, A. Solyak, N. Woodley, M. GP IEEE TI Status of the ILC Main Linac lattice designs SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The report describes the present design of the ILC Main Linac lattice. The topics covered include basic element layout, optical functions, and issues centered around the linac following of the Earth's curvature. C1 [Valishev, A.; Solyak, N.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. [Woodley, M.] Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Valishev, A (reprint author), Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. EM valishev@fnal.gov FU Fermi Research Alliance; U.S. Dept. of Energy [DEAC02-76CH03000] FX Work supported by the Fermi Research Alliance, under contract DEAC02-76CH03000 with the U.S. Dept. of Energy. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2210 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302206 ER PT B AU Yonehara, K Balbekov, VI Broemmelsiek, D Hu, M Jansson, A Kashikhin, V Kashikhin, V Lamm, M Mokhov, NV Shiltsev, V Yarba, V Abrams, RJ Cummings, MA Johnson, RP Kahn, SA Roberts, TJ AF Yonehara, K. Balbekov, V. I. Broemmelsiek, D. Hu, M. Jansson, A. Kashikhin, Vadim. Kashikhin, Vladimir Lamm, M. Mokhov, N. V. Shiltsev, V. Yarba, V. Abrams, R. J. Cummings, M. A. Johnson, R. P. Kahn, S. A. Roberts, T. J. GP IEEE TI The MANX muon cooling demonstration experiment SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB MANX is an experiment to prove that effective six-dimensional (6D) muon beam cooling can be achieved in a Helical Cooling Channel (HCC) using ionization-cooling with helical and solenoidal magnets in a novel configuration. The aim is to demonstrate that 6D muon beam cooling is understood well enough to plan intense neutrino factories and high-luminosity muon colliders. The experiment consists of the HCC magnet that envelops a liquid helium energy absorber, upstream and downstream instrumentation to measure the beam parameters before and after cooling, and emittance matching sections between the detectors and the HCC. C1 [Yonehara, K.; Balbekov, V. I.; Broemmelsiek, D.; Hu, M.; Jansson, A.; Kashikhin, Vadim.; Kashikhin, Vladimir; Lamm, M.; Mokhov, N. V.; Shiltsev, V.; Yarba, V.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. [Abrams, R. J.; Cummings, M. A.; Johnson, R. P.; Kahn, S. A.; Roberts, T. J.] Muons Inc, Batavia, IL 60510 USA. RP Yonehara, K (reprint author), Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. EM yonehara@fnal.gov FU DOE STTR [DE-FG02-06ER86282, DE-AC02-07CH11359] FX Supported DOE STTR grant DE-FG02-06ER86282 & DE-AC02-07CH11359. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2213 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302207 ER PT B AU Toth, C Esarey, E Geddes, CGR Leemans, WP Nakarnurat, K Panasenko, D Schroeder, CB Bruhwiler, D Cary, JR AF Toth, Cs. Esarey, E. Geddes, C. G. R. Leemans, W. P. Nakarnurat, K. Panasenko, D. Schroeder, C. B. Bruhwiler, D. Cary, J. R. GP IEEE TI Colliding pulse injection experiments in non-collinear geometry for controlled laser plasma wakefield acceleration of electrons SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE ID BEAMS; BUNCHES AB An optical injection scheme for a laser-plasma based accelerator which employs a non-collinear counterpropagating laser beam to push background electrons in the focusing and acceleration phase via ponderomotive beat with the trailing part of the wakefield driver pulse is discussed. Preliminary experiments were preformed using a drive beam of a(0) similar or equal to 2.6 and colliding beam of a(1) similar or equal to 0.8 both focused on the middle of a 200 mu m slit jet backed with 20 bar, which provided similar or equal to 250 mu m long gas plume. The enhancement in the total charge by the colliding pulse was observed with sharp dependence on the delay time of the colliding beam. Enhancement of the neutron yield was also measured, which suggests a generation of electrons above 10 MeV. C1 [Toth, Cs.; Esarey, E.; Geddes, C. G. R.; Leemans, W. P.; Nakarnurat, K.; Panasenko, D.; Schroeder, C. B.] Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. [Bruhwiler, D.; Cary, J. R.] Tech X Corp, Boulder, CO 80303 USA. RP Toth, C (reprint author), Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. EM CToth@lbl.gov FU DOE [DE-AC02-05CH11231]; DARPA; INCITE FX Work supported by DOE grant DE-AC02-05CH11231, DARPA, and INCITE computational grant. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2219 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302209 ER PT B AU Nakamura, K Esarey, E Geddes, CGR Gonsalves, AJ Leernans, WP Panasenko, D Schroeder, CB Toth, C Hooker, SM AF Nakamura, K. Esarey, E. Geddes, C. G. R. Gonsalves, A. J. Leernans, W. P. Panasenko, D. Schroeder, C. B. Toth, Cs. Hooker, S. M. GP IEEE TI Performance of capillary discharge guided laser plasma wakefield accelerator SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE ID ELECTRON-BEAMS; FEMTOSECOND LASER AB A GeV-class laser-driven plasma-based wakefield accelerator has been realized at the Lawrence Berkeley National Laboratory (LBNL). The device consists of the 40 TW high repetition rate Ti:sapphire LOASIS laser system at LBNL and a gas-filled capillary discharge waveguide developed at Oxford University. The operation of the capillary discharge guided laser plasma wakefield accelerator with a capillary of 225 mu m diameter and 33 mm in length was analyzed in detail. The input intensity dependence suggests that excessive self-injection causes increased beam loading leading to broadband lower energy electron beam generation. The trigger versus laser arrival timing dependence suggests that the plasma channel parameters can be tuned to reduce beam divergence. C1 [Nakamura, K.; Esarey, E.; Geddes, C. G. R.; Gonsalves, A. J.; Leernans, W. P.; Panasenko, D.; Schroeder, C. B.; Toth, Cs.] LBNL, Berkeley, CA 94720 USA. [Hooker, S. M.] Univ Oxford, Oxford OX1 3PU, England. RP Nakamura, K (reprint author), LBNL, Berkeley, CA 94720 USA. EM KNakamura@lbl.gov RI Hooker, Simon/D-1402-2015 OI Hooker, Simon/0000-0002-1243-520X FU DOE [DE-AC02-05CH11231]; DARPA; INCITE FX Work supported by DOE grant DE-AC02-05CH11231, DARPA, and and INCITE computational grant. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2222 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302210 ER PT B AU Plateau, G Esarey, E Geddes, CGR Leemans, WR Matlis, N Schroeder, CB Van Tilborg, J Toth, C AF Plateau, G. Esarey, E. Geddes, C. G. R. Leemans, W. R. Matlis, N. Schroeder, C. B. Van Tilborg, J. Toth, Cs. GP IEEE TI Recent progress at LBNL on characterization of laser wakefield accelerated electron bunches using coherent transition radiation SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB At LBNL, laser wakefield accelerators (LWFA) can now produce ultra-short electron bunches with energies up to 1 GeV [1]. As femtosecond electron bunches exit the plasma they radiate an intense burst in the terahertz range [2,3] via coherent transition radiation (CTR). Measuring the CTR properties allows non-invasive bunch-length diagnostics [4], a key to continuing rapid advance in LWFA technology. Experimental bunch length characterization for two different energy regimes through bolometric analysis and electro-optic (EO) sampling are presented. Measurements demonstrate both shot-to-shot stability of bunch parameters, and femtosecond synchronization between the bunch, the THz pulse, and the laser beam. In addition, this method of CTR generation provides THz pulses of very high peak power suitable for applications. Recent results reveal LATA to be a promising intense ultrafast THz source. C1 [Plateau, G.; Esarey, E.; Geddes, C. G. R.; Leemans, W. R.; Matlis, N.; Schroeder, C. B.; Van Tilborg, J.; Toth, Cs.] LBNL, Berkeley, CA 94720 USA. RP Plateau, G (reprint author), LBNL, Berkeley, CA 94720 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2225 EP 2227 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302211 ER PT B AU Reichel, I AF Reichel, I. GP IEEE TI Injection and extraction lines for the ILC Damping Rings SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The current design for the injection and extraction fines into and out of the ILC Damping Rings is presented as wen as the design for the abort line. Due to changes of the geometric boundary conditions by other subsystems of the ILC, a modular approach has been used to be able to respond to recurring layout changes while reusing previously designed parts. C1 LBNL, Berkeley, CA 94720 USA. RP Reichel, I (reprint author), LBNL, Berkeley, CA 94720 USA. EM ireichel@lbl.gov 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2228 EP 2230 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302212 ER PT B AU Reichel, I AF Reichel, I. GP IEEE TI Frequency map studies for the ILC Damping Rings SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Designing a lattice with sufficient dynamic aperture for the ILC Damping Rings is very challenging as the lattice needs to provide a small equilibrium emittance and at the same time a large aperture for the injected beam (including a large momentum acceptance). In addition, outside constraints have forced layout changes in the damping ring. Some of the layout changes had an impact on the dynamic aperture. In order to better understand the changes in dynamic aperture, frequency maps are studied. Those studies can help in identifying the reason for the changed dynamic aperture and in finding a good location for the betatron tunes and determining an upper limit for the chromaticities. A summary of recent studies and suggestions for improving the dynamic aperture by choosing a different tune are presented. C1 LBNL, Berkeley, CA 94720 USA. RP Reichel, I (reprint author), LBNL, Berkeley, CA 94720 USA. EM ireichel@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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2231 EP 2233 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302213 ER PT B AU Staples, JW Baptiste, KM Corlett, JN Kwiatkowski, S Lidia, SM Qiang, J Sannibale, F Sonnad, KG Virostek, SP Wells, RP AF Staples, J. W. Baptiste, K. M. Corlett, J. N. Kwiatkowski, S. Lidia, S. M. Qiang, J. Sannibale, F. Sonnad, K. G. Virostek, S. P. Wells, R. P. GP IEEE TI Design of a VHF-band RF photoinjector with megahertz beam repetition rate SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB New generation accelerator-based X-ray light sources require high quality beams with high average brightness. Normal conducting L- and S-band photoinjectors are limited in repetition rate and D-C (photo)injectors are limited in field strength at the cathode. We propose a low frequency normal-conducting cavity, operating at 50 to 100 MHz CW, to provide beam bunches of up to the cavity frequency. The photoinjector uses a re-entrant cavity structure, requiring less than 100 kW CW, with a peak wall power density less than 10 W/cm(2). The cavity will support a vacuum down to 10 picoTorr, with a load-lock mechanism for easy replacement of photocathodes. The photocathode can be embedded in a magnetic field to provide correlations useful for emittance exchange. Beam dynamics simulations indicate that normalized emittances smaller than 1 mm-mrad are possible with gap voltage of 750 kV, with fields up to 20 MV/m at the photocathode, for 1 nanocoulomb charge per bunch after acceleration and emittance compensation. Long-bunch operation (10's of picosecond) is made possible by the low cavity frequency, permitting low bunch current at the 750 kV gap voltage. C1 [Staples, J. W.; Baptiste, K. M.; Corlett, J. N.; Kwiatkowski, S.; Lidia, S. M.; Qiang, J.; Sannibale, F.; Sonnad, K. G.; Virostek, S. P.; Wells, R. P.] LBNL, Berkeley, CA 94720 USA. RP Staples, JW (reprint author), LBNL, Berkeley, CA 94720 USA. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2234 EP 2236 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302214 ER PT B AU Venturini, M Funnan, M Vay, JL Pivi, M AF Venturini, M. Funnan, M. Vay, J. -L. Pivi, M. GP IEEE TI Modelling of e-cloud build-up in grooved vacuum chambers using POSINST SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Use of grooved vacuum chambers have been suggested as a way to limit electron cloud accumulation in the ILC-DR. We report on simulations carried out using an augmented version of POSINST, accounting for e-cloud dynamics in the presence of grooves, and make contact with previous estimates of an effective secondary electron yield for grooved surfaces. C1 [Venturini, M.; Funnan, M.; Vay, J. -L.] LBNL, Berkeley, CA USA. [Pivi, M.] SLAC, Menlo Pk, CA 94025 USA. RP Venturini, M (reprint author), LBNL, Berkeley, CA USA. EM mventurini@lbl.gov FU DOE [DE-AC02-OSCH11231] FX Work supported by DOE, Contract no. DE-AC02-OSCH11231. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2237 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302215 ER PT B AU Zisman, MS AF Zisman, Michael S. CA MICE Collaboration GP IEEE TI Status of the international Muon Ionization Cooling Experiment (MICE) SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB An international experiment to demonstrate muon ionization cooling is scheduled for beam at Rutherford Appleton Laboratory (RAL) in 2007. The experiment comprises one cell of the Study II cooling channel [1], along with upstream and downstream detectors to identify individual muons and measure their initial and final 6D phase-space parameters to a precision of 0.1%. Magnetic design of the beam line and cooling channel are complete and portions are under construction. The experiment will be described, including cooling channel hardware designs, fabrication status, and running plans. Phase 1 of the experiment will prepare the beam line and provide detector systems, including time-of-flight, Cherenkov, scintillating-fiber trackers and their spectrometer solenoids, and an electromagnetic calorimeter. The Phase 2 system will add the cooling channel components, including liquid-hydrogen absorbers embedded in superconducting Focus Coil solenoids, 201-MHz normal-conducting RF cavities, and their surrounding Coupling Coil solenoids. The MICE Collaboration goal is to complete the experiment by 2010; progress toward this is discussed. C1 [Zisman, Michael S.] LBNL, Berkeley, CA 94720 USA. RP Zisman, MS (reprint author), LBNL, Berkeley, CA 94720 USA. EM mszisman@lbl.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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2240 EP 2242 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302216 ER PT B AU Marsh, RA Shapiro, MA Temkin, RJ Smirnova, EI AF Marsh, R. A. Shapiro, M. A. Temkin, R. J. Smirnova, E. I. GP IEEE TI Observation of wakefields in a 17 GHz metallic photonic bandgap (PBG) structure SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Preliminary results are reported on experimental wakefield measurements made on a 6 cell, 17.14 GHz metallic photonic band gap (PBG) accelerator structure. Wakefields were observed using a variety of detectors and methods. The PBG structure is open, containing no outer wall, and radiation has been observed through a window in the surrounding vacuum vessel. The output coupler port has also been used with a vacuum window to observe radiation coupling out of the port. Estimations of radiation are made using HFSS and basic wakefield theory. Measurements have been made using video diode detectors and a heterodyne receiver. Plans are discussed for further experiments. C1 [Marsh, R. A.; Shapiro, M. A.; Temkin, R. J.] MIT, Plasma Sci & Fus Ctr, 77 Massachusetts Ave, Cambridge, MA 02139 USA. [Smirnova, E. I.] LANL, Los Alamos, NM 87545 USA. RP Marsh, RA (reprint author), MIT, Plasma Sci & Fus Ctr, 77 Massachusetts Ave, Cambridge, MA 02139 USA. EM roark@niit.edu FU DoE HEP [DE-FG02-91ER40648] FX Work supported by DoE HEP, under contract DE-FG02-91ER40648. NR 6 TC 0 Z9 0 U1 0 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2246 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302218 ER PT B AU Vinogradov, N Bohn, CL Piot, P Lewellen, JW Noonan, JR AF Vinogradov, N. Bohn, C. L. Piot, P. Lewellen, J. W. Noonan, J. R. GP IEEE TI Polarized pulsed beam source for electronic microscopy SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB A novel pulsed spin-polarized electron source is discussed. Unlike conventional devices based either on a thermionic cathodes or field-emission needle cathodes, the present source is based on photoemission. A gallium arsenide (GaAs) planar cathode impinged with a suitable circularly polarized laser can produce a polarized pulsed electron bunch with duration of the order of the laser pulse. Numerical simulations of the electron dynamics in the optimized cathode-anode geometry have shown that the beam with initial transverse size of a few min can be focused down to 1 mu m root-mean-square (RMS). The suggested source can, in principle, be installed on existing electron microscope thereby opening the path to time-resolved microscopy. Spin-polarization offers an effective probe for some magnetic phenomena. The design of the source and subsequent fabrication has been completed. In the present paper we discuss numerical studies of the source performance, its conceptual design, and report on the experimental status. C1 [Vinogradov, N.; Bohn, C. L.; Piot, P.] No Illinois Univ, De Kalb, IL 60115 USA. [Lewellen, J. W.; Noonan, J. R.] Argonne Natl Lab, AST DoD Project Off, Argonne, IL 60440 USA. RP Vinogradov, N (reprint author), No Illinois Univ, De Kalb, IL 60115 USA. EM vinogradov@phy.anl.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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2255 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302221 ER PT B AU Smith, JC Latina, A Schulte, D Poirier, F Walker, N Lebrun, P Ranjan, K Kubo, K Tenenbaum, P Eliasson, P AF Smith, Jeffrey C. Latina, Andrea Schulte, Daniel Poirier, Freddy Walker, Nicholas Lebrun, Paul Ranjan, Kirti Kubo, Kiyoshi Tenenbaum, Peter Eliasson, Peder GP IEEE TI Comparison of tracking codes for the International Linear Collider SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB in an effort to compare beam dynamics and create a "benchmark" for Dispersion Free Steering (DFS) a comparison was made between different International Linear Collider (ILC) simulation programs while performing DFS. This study consisted of three parts. Firstly, a simple betatron oscillation was tracked through each code. Secondly, a set of component misalignments and corrector settings generated from one program was read into the others to confirm similar emittance dilution. Thirdly, given the same set of component misalignments, DFS was performed independently in each program and the resulting emittance dilution was compared. Performance was found to agree exceptionally well in all three studies. C1 [Smith, Jeffrey C.] Cornell Univ, CLASSE, Ithaca, NY 14853 USA. [Latina, Andrea; Schulte, Daniel] CERN, Geneva, Switzerland. [Poirier, Freddy; Walker, Nicholas] DESY, Hamburg, Germany. [Lebrun, Paul; Ranjan, Kirti] Fermilab Natl Accelerator Lab, Batavia, IL USA. [Kubo, Kiyoshi] KEK, Ibaraki, Japan. [Tenenbaum, Peter] SLAC, Menlo Pk, CA USA. [Eliasson, Peder] Uppsala Univ, Uppsala, Sweden. RP Smith, JC (reprint author), Cornell Univ, CLASSE, Ithaca, NY 14853 USA. EM js344@slac.stanford.edu FU US Department of Energy [DE-FG02-04ER41352, DE-AC02-76SF00515]; US National Science Foundation [PHY-0202078]; Commission of European Communities [RIDS-011899] FX Work supported by the US Department of Energy under contracts DE-FG02-04ER41352 and DE-AC02-76SF00515, the US National Science Foundation under contract PHY-0202078 and the Commission of the European Communities under the 6th Framework Programme "Structuring the European Research Area", contract number RIDS-011899. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2264 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302224 ER PT B AU Houck, T Brown, C Fleming, D Kreitzer, B Lewis, K Ong, M Zender, J AF Houck, T. Brown, C. Fleming, D. Kreitzer, B. Lewis, K. Ong, M. Zender, J. GP IEEE TI Design of a high field stress, velvet cathode for the Flash X-ray (FXR) induction accelerator SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB A new cathode design has been proposed for the Flash X-Ray (FXR) induction linear accelerator with the goal of lowering the beam emittance. The original design uses a conventional Pierce geometry and applies a peak field of 134 kV/cm (no beam) to the velvet emission surface. Voltage/current measurements indicate that the velvet begins emitting near this peak field value and images of the cathode show a very non-uniform distribution of plasma light. The new design has a flat cathode/shroud profile that allows for a peak field stress of 230 kV/cm on the velvet. The emission area is reduced by about a factor of four to generate the same total current due to the greater field stress. The relatively fast acceleration of the beam, approximately 2.5 MeV in 10 cm, reduces space charge forces that tend to hollow the beam for a flat, non-Pierce geometry. The higher field stress achieved with the same rise time is expected to lead to an earlier and more uniform plasma formation over the velvet surface. Simulations and initial testing are presented. C1 [Houck, T.; Brown, C.; Fleming, D.; Kreitzer, B.; Lewis, K.; Ong, M.; Zender, J.] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Houck, T (reprint author), Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2267 EP 2269 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302225 ER PT B AU Thompson, MC Badakov, H Rosenzweig, JB Travish, G Hogan, MJ Ischebeck, R Kirby, N Siemann, R Walz, D Muggli, P Scott, A Yoder, R AF Thompson, M. C. Badakov, H. Rosenzweig, J. B. Travish, G. Hogan, M. J. Ischebeck, R. Kirby, N. Siemann, R. Walz, D. Muggli, P. Scott, A. Yoder, R. GP IEEE TI Observation of multi-GeV breakdown thresholds in dielectricwakefield structures SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB An experiment designed to test the breakdown threshold of a dielectric subjected to the GV/m-scale electric-fields of an intense electron-beam has been completed. In this experiment at the Final Focus Test Beam (FFTB) facility, the 28.5 GeV SLAC electron beam was focused down and propagated through short fused-silica capillary-tubes with internal diameters of as little as 100 mu m. The electric field at the inner surface of the tubes was varied from about I GV/m to 22 GV/m by adjusting the longitudinal compression of the electron bunch. We observed a sharp increase in optical emissions from the capillaries in the middle part of this surface field range which we believe indicates the transition between sustainable field levels and breakdown. If this initial interpretation is correct, the multi-GV/m surfaced fields that were sustained equate to on axis accelerating field of several GV/m. C1 [Thompson, M. C.] TAE Inc, Irvine, CA USA. [Thompson, M. C.; Badakov, H.; Rosenzweig, J. B.; Travish, G.] Univ Calif Los Angeles, Los Angeles, CA 90095 USA. [Thompson, M. C.] LLNL, Livermore, CA 94550 USA. [Hogan, M. J.; Ischebeck, R.; Kirby, N.; Siemann, R.; Walz, D.] Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. [Muggli, P.] Univ So Calif, Los Angeles, CA 90089 USA. [Scott, A.] Univ Calif Santa Barbara, Santa Barbara, CA 93106 USA. [Yoder, R.] Manhattan Coll, Bronx, NY 10471 USA. RP Thompson, MC (reprint author), TAE Inc, Irvine, CA USA. EM dr.mcthompson@gmail.com FU US Dept. of Energy [DE-FG03-92ER40693, DE-AC02-76SF00515, W-7405-ENG-48, DE-FG02-92-ER40745] FX Work supported by the US Dept. of Energy under Contracts No. DE-FG03-92ER40693, DE-AC02-76SF00515, W-7405-ENG-48, and DE-FG02-92-ER40745. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2270 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302226 ER PT B AU Rusnak, B Hall, JM Fitsos, P Souza, R Jong, M AF Rusnak, B. Hall, J. M. Fitsos, P. Souza, R. Jong, M. GP IEEE TI A large-format imaging optics system for fast neutron radiography SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB As part of the ongoing development of fast neutron imaging technology for national security applications at LLNL, a large-format imaging optics system is being designed and built. The system will be used to acquire radiographic images of heavily-shielded low-Z objects irradiated by similar to 10 MeV neutrons and is expected to have an ultimate spatial resolution similar to 1mm (FWHM). It is comprised of a 65 cm x 65 cm plastic scintillator (e.g. BC-408), an aluminized front-surface turning mirror and a fast (similar to f/1.25) optical lens coupled to a CCD camera body with a cryo-cooled, back-illuminated 4096 x 4096 (15 mu m) pixel sensor. The lens and camera were developed and purchased from vendors and system integration is being done at LLNL. A description of the overall system and its projected performance characteristics shall be presented. C1 [Rusnak, B.; Hall, J. M.; Fitsos, P.; Souza, R.; Jong, M.] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Rusnak, B (reprint author), Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2273 EP 2275 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302227 ER PT B AU Miyadera, H Jason, AJ Nagamine, K AF Miyadera, H. Jason, A. J. Nagamine, K. GP IEEE TI Design of muon accelerators for an advanced muon facility SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE ID DAI-OMEGA; GENERATION; CHANNEL AB We plan to develop a low-emittance muon beam for the next-generation muon facility at LANSCE. Use of a large-acceptance muon linear accelerator is a key technique for our scheme, and a preliminary accelerator design has been made. Description of high-collection low-emittance muon generation and some results of the simulations are described. C1 [Miyadera, H.; Jason, A. J.] Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. [Nagamine, K.] Univ Calif Riverside, Riverside, CA 92521 USA. RP Miyadera, H (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2276 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302228 ER PT B AU Cook, AM Badakov, H England, RJ Rosenzweig, JB Tikhoplav, R Travish, G Williams, OB Thompson, MC Kanareykin, A AF Cook, A. M. Badakov, H. England, R. J. Rosenzweig, J. B. Tikhoplav, R. Travish, G. Williams, O. B. Thompson, M. C. Kanareykin, A. GP IEEE TI Beam-driven dielectric wakefield accelerating structure as a THz radiation source SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE ID WAKE-FIELD AB Experimental work is planned to study the performance of a beam-driven cylindrical dielectric wakefield accelerating structure as a source of THz coherent Cerenkov radiation (CCR). For an appropriate choice of dielectric tube geometry and driving electron bunch parameters, the device operates in a single-mode regime, producing radiation in the THz range. This source can potentially produce high power levels relative to currently available sources, with similar to 50 mu J radiated energy per pulse achievable using the electron beam currently in operation at the Neptune advanced accelerator laboratory at UCLA (similar to 13 MeV beam energy, similar to 200 mu m RMS bunch length, similar to 500 pC bunch charge). Preparations underway for installation of the experiment are discussed. C1 [Cook, A. M.; Badakov, H.; England, R. J.; Rosenzweig, J. B.; Tikhoplav, R.; Travish, G.; Williams, O. B.] Univ Calif Los Angeles, Los Angeles, CA 90095 USA. [Thompson, M. C.] LLNL, Livermore, CA 94550 USA. [Kanareykin, A.] Euclid TechLabs, Solon, OH 44139 USA. RP Cook, AM (reprint author), Univ Calif Los Angeles, Los Angeles, CA 90095 USA. EM alancook@physics.ucla.edu RI Cook, Alan/D-2557-2013 FU United States Department of Energy FX Work supported by the United States Department of Energy 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2285 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302231 ER PT B AU Travish, G Badakov, H Cook, A Rosenzweig, J Tikhoplav, R Kanareykin, A Thompson, MC Berry, MK Blumenfeld, I Decker, FJ Hogan, MJ Ischebeck, R Iverson, R Kirby, N Siemann, R Walz, D Muggli, P AF Travish, G. Badakov, H. Cook, A. Rosenzweig, J. Tikhoplav, R. Kanareykin, A. Thompson, M. C. Berry, M. K. Blumenfeld, I. Decker, F. J. Hogan, M. J. Ischebeck, R. Iverson, R. Kirby, N. Siemann, R. Walz, D. Muggli, P. GP IEEE TI Dielectric wakefield accelerator experiments at the saber facility SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE ID ELECTRON-BEAMS AB Electron bunches with the unparalleled combination of high charge, low emittances, and short time duration, as first produced at the SLAC Final Focus Test Beam (FFTB), are foreseen to be produced at the SABER facility. These types of bunches have enabled wakefield driven accelerating schemes of multi-GV/m in plasmas. In the context of the Dielectric Wakefield Accelerators (DWA) such beams, having rms bunch length as short as 20 um, have been used to drive 100 urn and 200 um ID hollow tubes above 20 GV/m surface fields. These FFTB tests enabled the measurement of a breakdown threshold in fused silica (with full data analysis still ongoing) [1]. With the construction and commissioning of the SABER facility at SLAC, new experiments would be made possible to test further aspects of DWAs including materials, tube geometrical variations, direct measurements of the Cerenkov fields, and proof of acceleration in tubes >10 cm in length. This collaboration will investigate breakdown thresholds and accelerating fields in new materials including CVD diamond. Here we describe the experimental plans, beam parameters, simulations, and progress to date as well as future prospects for machines based of DWA structures. C1 [Travish, G.; Badakov, H.; Cook, A.; Rosenzweig, J.; Tikhoplav, R.] Univ Calif Los Angeles, Los Angeles, CA 90095 USA. [Kanareykin, A.] Euclid TechLabs, Solon, OH 44139 USA. [Thompson, M. C.] LLNL, Livermore, CA 94550 USA. [Berry, M. K.; Blumenfeld, I.; Decker, F. J.; Hogan, M. J.; Ischebeck, R.; Iverson, R.; Kirby, N.; Siemann, R.; Walz, D.] SLAC, Menlo Pk, CA 94025 USA. [Muggli, P.] Univ So Calif, Los Angeles, CA 90089 USA. RP Travish, G (reprint author), Univ Calif Los Angeles, Los Angeles, CA 90095 USA. EM travish@physics.ucla.edu RI Cook, Alan/D-2557-2013 FU US Dept. of Energy [DE-FG03-92ER40693, DE-AC02-76SF00515, W-7405-ENG-48, DE-FG02-92-ER40745] FX Work supported by the US Dept. of Energy under Contracts No. DE-FG03-92ER40693, DE-AC02-76SF00515, W-7405-ENG-48, and DE-FG02-92-ER40745. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2302 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302237 ER PT B AU Zhou, M Clayton, CE Huang, C Joshi, C Lu, W Marsh, KA Mori, WB Katsouleas, T Muggli, P Oz, E Berry, M Blumenfeld, I Decker, FJ Hogan, MJ Ischebeck, R Iverson, R Kirby, N Siemann, R Walz, D AF Zhou, M. Clayton, C. E. Huang, C. Joshi, C. Lu, W. Marsh, K. A. Mori, W. B. Katsouleas, T. Muggli, P. Oz, E. Berry, M. Blumenfeld, I. Decker, F. J. Hogan, M. J. Ischebeck, R. Iverson, R. Kirby, N. Siemann, R. Walz, D. GP IEEE TI Beam head erosion in self-ionized plasma wakefield accelerators SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB In the recent plasma wakefield accelerator experiments at SLAC, the energy of the particles in the tail of the 42 GeV electron beam were doubled in less than one meter [1]. Simulations suggest that the acceleration length was limited by a new phenomenon - beam head erosion in self-ionized plasmas. In vacuum, a particle beam expands transversely in a distance given by beta*. In the blowout regime of a plasma wakefield [2], the majority of the beam is focused by the ion channel, while the beam head slowly spreads since it takes a finite time for the ion channel to form. It is observed that in self-ionized plasmas, the head spreading is exacerbated compared to that in pre-ionized plasmas, causing the ionization front to move backward (erode). A simple theoretical model is used to estimate the upper limit of the erosion rate for a bi-gaussian beam by assuming free expansion of the beam head before the ionization front. Comparison with simulations suggests that half this maximum value can serve as an estimate for the erosion rate. Critical parameters to the erosion rate are discussed. C1 [Zhou, M.; Clayton, C. E.; Huang, C.; Joshi, C.; Lu, W.; Marsh, K. A.; Mori, W. B.; Oz, E.] Univ Calif Los Angeles, Los Angeles, CA 90095 USA. [Katsouleas, T.; Muggli, P.] USC, Los Angeles, CA 90089 USA. [Berry, M.; Blumenfeld, I.; Decker, F. J.; Hogan, M. J.; Ischebeck, R.; Iverson, R.; Kirby, N.; Siemann, R.; Walz, D.] SLAC, Menlo Pk, CA 94025 USA. RP Zhou, M (reprint author), Univ Calif Los Angeles, Los Angeles, CA 90095 USA. EM mmzhou@ee.ucla.edu RI Lu, Wei/F-2504-2016 FU Department of Energy [DEAC02-76SF00515, DE-FG02-92ER40727, DE-FG02-92-ER40745, DE-FG02-03ER54721, DE-FC02-01ER41179]; NSF [Phy-0321345] FX Work supported by Department of Energy contracts DEAC02-76SF00515,DE-FG02-92ER40727, DE-FG02-92-ER40745 DE-FG02-03ER54721, DE-FC02-01ER41179 and NSF grant Phy-0321345. NR 11 TC 0 Z9 0 U1 0 U2 3 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2308 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302239 ER PT B AU Kallos, E Katsouleas, T Muggli, P Pavlishin, I Pogorelsky, I Stolyarov, D Yakimenko, V Kimura, WD AF Kallos, E. Katsouleas, T. Muggli, P. Pavlishin, I. Pogorelsky, I. Stolyarov, D. Yakimenko, V. Kimura, W. D. GP IEEE TI Plasma wakefield acceleration utilizing multiple electron bunches SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE ID WAKE-FIELD ACCELERATION AB We investigate various plasma wakefield accelerator schemes that rely on multiple electron bunches to drive a large amplitude plasma wave, which are followed by a witness bunch at a phase where it will sample the high acceleration gradient and gain energy. Experimental verifications of various two bunch schemes are available in the literature; here we provide analytical calculations and numerical simulations of the wakefield dependency and the transformer ratio when M drive bunches and one witness bunch are fed into a high density plasma, where M is between 2 and 10. This is a favorable setup since the bunches can be adjusted such that the transformer ratio and the efficiency of the accelerator are enhanced compared to single bunch schemes. The possibility of a five bunch ILC afterburner to accelerate a witness bunch from 100 GeV to 500 GeV is also examined. C1 [Kallos, E.; Katsouleas, T.; Muggli, P.] Univ So Calif, Los Angeles, CA 90089 USA. [Pogorelsky, I.; Stolyarov, D.; Yakimenko, V.] Brookhaven Natl Lab, Upton, NY 11973 USA. [Kimura, W. D.] STI Optron, Bellevue, WA USA. RP Kallos, E (reprint author), Univ So Calif, Los Angeles, CA 90089 USA. NR 10 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2314 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302241 ER PT B AU Muggli, P Kimura, WD Kallos, E Katsouleas, TC Kusche, KP Pavlishin, IV Stolyarov, D Yakimenko, VE AF Muggli, P. Kimura, W. D. Kallos, E. Katsouleas, T. C. Kusche, K. P. Pavlishin, I. V. Stolyarov, D. Yakimenko, V. E. GP IEEE TI Plasma wakefield acceleration experiments using two subpicosecond electron bunches SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Two subpicosecond electron bunches, separated in energy by approximately 2 MeV and in time by 0.5-1 ps, are sent through a capillary discharge plasma. The plasma density is varied from similar to 10(14) cm(-3) to similar to 10(18) cm(-3). A 1-D plasma wakefield acceleration (PWFA) model indicates the net wakefield produced by the bunches will depend on their relative charge, temporal separation, and the plasma density. The wakefield of the first bunch will also affect the amount of energy gain or loss of the second bunch. During measurements of the energy spectrum of the bunches, we observed a difference in the amount of loss depending on the plasma density. Indication of gain was also observed. C1 [Muggli, P.; Kallos, E.; Katsouleas, T. C.] Univ So Calif, Los Angeles, CA 90089 USA. [Kimura, W. D.] STI Optron, Bellevue, WA USA. [Kusche, K. P.; Pavlishin, I. V.; Stolyarov, D.; Yakimenko, V. E.] Brookhaven Natl Lab, Upton, NY 11973 USA. RP Muggli, P (reprint author), Univ So Calif, Los Angeles, CA 90089 USA. EM muggli@usc.edu FU U.S. Department of Energy [DE-FG02-04ER41294, DE-AC02-98CH10886, DE-FG03-92ER40695, DEFG02-92ER40745] FX Work supported by U.S. Department of Energy, Grant Nos. DE-FG02- 04ER41294, DE-AC02-98CH10886, DE-FG03-92ER40695, and DEFG02-92ER40745. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2317 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302242 ER PT B AU Muggli, P Katsouleas, T Oz, E Blumenfeld, I Decker, FJ Hogan, MJ Ischebeck, R Iverson, R Kirby, N Siemann, R Walz, D Clayton, CE Huang, C Joshi, C Lu, W Marsh, KA Mori, WB Zhou, M AF Muggli, P. Katsouleas, T. Oz, E. Blumenfeld, I. Decker, F. -J. Hogan, M. J. Ischebeck, R. Iverson, R. Kirby, N. Siemann, R. Walz, D. Clayton, C. E. Huang, C. Joshi, C. Lu, W. Marsh, K. A. Mori, W. B. Zhou, M. GP IEEE TI Scaling of energy gain with plasma parameters in a plasma wakefield accelerator SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB We have recently demonstrating the doubling of the energy of particles of the ultra-short, ultra-relativistic electron bunches of the Stanford Linear Accelerator Center [1]. This energy doubling occurred in a plasma only 85 cm-long with a density of approximate to 2.6x10(17) e(-)/cm(-3). This milestone is the result of systematic measurements that show the scaling of the energy gain with plasma length and density, and show the reproducibility and the stability of the acceleration process. We show that the energy gain increases linearly with plasma length from 13 to 31 cm. These are key steps toward the application of beam-driven plasma accelerators or plasma wakefield accelerators (PWFA) to doubling the energy of a future linear collider without doubling its length. C1 [Muggli, P.; Katsouleas, T.; Oz, E.] Univ So Calif, Los Angeles, CA 90089 USA. [Clayton, C. E.; Huang, C.; Joshi, C.; Lu, W.; Marsh, K. A.; Mori, W. B.; Zhou, M.] Univ Calif Los Angeles, Los Angeles, CA 90024 USA. [Blumenfeld, I.; Decker, F. -J.; Hogan, M. J.; Ischebeck, R.; Iverson, R.; Kirby, N.; Siemann, R.; Walz, D.] SLAC, Menlo Pk, CA USA. RP Muggli, P (reprint author), Univ So Calif, Los Angeles, CA 90089 USA. RI Lu, Wei/F-2504-2016 FU US DoE [DE-AC02-76SF00515, DE-FG03-92ER40745, DE-FG03-98DP00211, DE-FG03-92ER40727, DE-AC-0376SF0098]; NSF [ECS-9632735, DMS-9722121, PHY-0078715] FX The authors would like to thank Dr. Peter Tsou of JPL for the aerogel. Work supported by US DoE under contracts DE-AC02-76SF00515, DE-FG03-92ER40745, DE-FG03-98DP00211, DE-FG03-92ER40727, DE-AC-0376SF0098 and NSF Grants ECS-9632735, DMS-9722121, PHY-0078715. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2320 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302243 ER PT B AU Muggli, P Kallos, E Yakimenko, VE Babzien, M Kusche, KP Kimura, WD AF Muggli, P. Kallos, E. Yakimenko, V. E. Babzien, M. Kusche, K. P. Kimura, W. D. GP IEEE TI Generation and characterization of microbunched beams with a wire mesh mask SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB We use a wire mesh mask placed in a dispersive region of the Accelerator Test Facility (ATF) at Brookhaven National Laboratory to produce a train of picosecond microbunches. The bunch spacing and charge can be tailored for specific applications. We plan on using this method to generate a train of drive bunches and a witness bunch for plasma wakefield accelerator experiments. C1 [Muggli, P.; Kallos, E.] Univ So Calif, Los Angeles, CA 90089 USA. [Yakimenko, V. E.; Babzien, M.; Kusche, K. P.] Brookhaven Natl Lab, Upton, NY 11973 USA. [Kimura, W. D.] STI Optronics Inc, Bellevue, WA 98004 USA. RP Muggli, P (reprint author), Univ So Calif, Los Angeles, CA 90089 USA. FU U.S. Department of Energy [DE-FG02-04ER41294, DE-AC02-98CH10886, DE-FG03-92ER40695, DE-FG02-92ER40745] FX This work was supported by the U.S. Department of Energy, Grant Nos. DE-FG02-04ER41294, DE-AC02-98CH10886, DE-FG03-92ER40695, and DE-FG02-92ER40745. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2323 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302244 ER PT B AU Wang, X Muggli, P Katsouleas, T Ischebeck, R Joshi, C AF Wang, X. Muggli, P. Katsouleas, T. Ischebeck, R. Joshi, C. GP IEEE TI On the possibility of accelerating positron on an electron wake at SABER SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB A new approach for positron acceleration in non-linear plasma wakefields driven by electron beams is presented. Positrons can be produced by colliding an electron beam with a thin foil target embedded in the plasma. Integration of positron production and acceleration in one stage is realized by a single relativistic, intense electron beam. Simulations with the parameters of the proposed SABER facility [1] at SLAC suggest that this concept could be tested there. C1 [Wang, X.; Muggli, P.; Katsouleas, T.] USC, Los Angeles, CA 90089 USA. [Ischebeck, R.] SLAC, Stanford, CA 94205 USA. [Joshi, C.] Univ Calif Los Angeles, Los Angeles, CA 90095 USA. RP Wang, X (reprint author), USC, Los Angeles, CA 90089 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2326 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302245 ER PT B AU Arnold, R Fisher, A Hast, C Szalata, Z Woods, M Schreiber, HJ Viti, M Duginov, V Kostromin, S Morozov, N AF Arnold, Ray Fisher, Andrew Hast, Carsten Szalata, Zen Woods, Mike Schreiber, Heinz Juergen Viti, Michele Duginov, Viktor Kostromin, Sergey Morozov, Nikolay GP IEEE TI Magnetic measurements and simulations for a 4-magnet diepole chicane for the international linear collider SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB T-474 at SLAC is a prototype BPM-based energy spectrometer for the ILC. We describe magnetic measurements and simulations for the 4-magnet chicane used in T-474. C1 [Arnold, Ray; Fisher, Andrew; Hast, Carsten; Szalata, Zen; Woods, Mike] SLAC, Menlo Pk, CA 94025 USA. [Schreiber, Heinz Juergen; Viti, Michele] DESY, Hamburg, Germany. [Duginov, Viktor; Kostromin, Sergey; Morozov, Nikolay] Joint Inst Nucl Res Dubna, Dubna, Russia. RP Arnold, R (reprint author), SLAC, Menlo Pk, CA 94025 USA. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2329 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302246 ER PT B AU Bane, K Seryi, A AF Bane, K. Seryi, A. GP IEEE TI Wakefield effects in the beam delivery system of the ILC SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE C1 [Bane, K.; Seryi, A.] Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Bane, K (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2332 EP 2334 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302247 ER PT B AU Blumenfeld, I Berry, M Decker, FJ Hogan, MJ Ischebeck, R Iverson, R Ydrby, N Siernann, R Walz, D Clayton, CE Huang, C Joshi, C Lu, W Marsh, KA Mori, WB Zhou, M Katsouleas, TC Muggli, P Oz, E AF Blumenfeld, I. Berry, M. Decker, F. -J. Hogan, M. J. Ischebeck, R. Iverson, R. Ydrby, N. Siernann, R. Walz, D. Clayton, C. E. Huang, C. Joshi, C. Lu, W. Marsh, K. A. Mori, W. B. Zhou, M. Katsouleas, T. C. Muggli, P. Oz, E. GP IEEE TI Correlation of beam parameters to decelerating gradient in the E-167 plasma wakefield acceleration experiment SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Recent experiments at SLAC have shown that high gradient acceleration of electrons is achievable in meter scale plasmas [1,2]. Results from these experiments show that the wakefield is sensitive to parameters in the electron beam which drives it. In the experiment the bunch length and beam waist location were varied systematically at constant charge. Here we investigate the correlation of peak beam current to the decelerating gradient. Limits on the transformer ratio will also be discussed. The results are compared to simulation. C1 [Blumenfeld, I.; Berry, M.; Decker, F. -J.; Hogan, M. J.; Ischebeck, R.; Iverson, R.; Ydrby, N.; Siernann, R.; Walz, D.] SLAC, Menlo Pk, CA 94025 USA. [Clayton, C. E.; Huang, C.; Joshi, C.; Lu, W.; Marsh, K. A.; Mori, W. B.; Zhou, M.] Univ Calif Los Angeles, Los Angeles, CA USA. [Katsouleas, T. C.; Muggli, P.; Oz, E.] USC, Los Angeles, CA USA. RP Blumenfeld, I (reprint author), SLAC, Menlo Pk, CA 94025 USA. EM ianb1@slac.stanford.edu RI Lu, Wei/F-2504-2016 FU Department of Energy [DE-AC02-76SF00515, DE-FG02-92ER40727, DE-FG02-92-ER40745, DE-FG02-03ER54721, DE-FC02-01ER41179]; NSF [Phy-0321345] FX Work supported by the Department of Energy contracts DE-AC02- 76SF00515, DE-FG02-92ER40727, DE-FG02-92-ER40745 DE-FG02- 03ER54721, DE-FC02-01ER41179 and NSF grant Phy-0321345. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2335 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302248 ER PT B AU Bower, G Sugimoto, Y Sinev, N Arnold, R Woods, M AF Bower, G. Sugimoto, Y. Sinev, N. Arnold, R. Woods, M. GP IEEE TI Disruption of particle detector electronics by beam generated EMI SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The possibility that radio frequency beam generated electromagnetic interference (EMI) could disrupt the operation of particle detector electronics has been of some concern since the inception of short pulse electron colliders more than 30 years ago [1]. Some instances have been reported where this may have occurred but convincing evidence has not been available. This possibility is of concern for the International Linear Collider (ILC). We have conducted test beam studies demonstrating that electronics disruption does occur using the vertex detector electronics (VXD) from the SLD detector which took data at the SLC at SLAC. We present the results of those tests, and we describe the need for EMI standards for beam and detector instrumentation in the IR region at the ILC. C1 [Bower, G.; Arnold, R.; Woods, M.] SLAC, Menlo Pk, CA 94025 USA. [Sugimoto, Y.] KEK, Ibaraki, Japan. [Sinev, N.] Univ Oregon, Eugene, OR 97403 USA. RP Bower, G (reprint author), SLAC, Menlo Pk, CA 94025 USA. 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 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2338 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302249 ER PT B AU Kirby, N Berry, M Blumenfeld, I Hogan, MJ Ischebeck, R Siemann, R AF Kirby, N. Berry, M. Blumenfeld, I. Hogan, M. J. Ischebeck, R. Siemann, R. GP IEEE TI Emittance growth from multiple coulomb scattering in a plasma wakefield accelerator SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Emittance growth is an important issue for plasma wakefield accelerators (PWFAs). Multiple Coulomb scattering (MCS) is one factor that contributes to this growth. Here, the MCS emittance growth of an electron beam traveling through a PWFA in the blow out regime is calculated. The calculation uses well established formulas for angular scatter in a neutral vapor and then extends the range of Coulomb interaction to include the effects of traveling through an ion column. Emittance growth is negligible for low Z materials; however, becomes important for high Z materials. C1 [Kirby, N.; Berry, M.; Blumenfeld, I.; Hogan, M. J.; Ischebeck, R.; Siemann, R.] SLAC, Menlo Pk, CA 94025 USA. RP Kirby, N (reprint author), SLAC, Menlo Pk, CA 94025 USA. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2341 EP 2343 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302250 ER PT B AU Molloy, S Adolphsen, C Bane, K Frisch, J Li, Z May, J McCormick, D Smith, T Baboi, N Eddy, N Piccoli, L Rechenmacher, R Jones, R AF Molloy, S. Adolphsen, C. Bane, K. Frisch, J. Li, Z. May, J. McCormick, D. Smith, T. Baboi, N. Eddy, N. Piccoli, L. Rechenmacher, R. Jones, R. GP IEEE TI Investigation of the wideband spectrum of Higher Order Modes measured on TESLA-style cavities at the flash LINAC SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Higher Order Modes (HOMs) excited by the passage of the beam through an accelerating cavity depend on the properties of both the cavity and the beam. It is possible, therefore, to draw conclusions on the inner geometry of the cavities based on observations of the properties of the HOM spectrum. A data acquisition system based on two 20 GS/s, 6 GHz scopes has been set up at the FLASH facility, DESY, in order to measure a significant fraction of the HOM spectrum predicted to be generated by the TESLA cavities used for the acceleration of its beam. The HOMs from a particular cavity at FLASH were measured under a range of known beam conditions. The dipole modes have been identified in the data. 3D simulations of different manufacturing errors have been made, and it has been shown that these simulations can predict the measured modes. C1 [Molloy, S.; Adolphsen, C.; Bane, K.; Frisch, J.; Li, Z.; May, J.; McCormick, D.; Smith, T.] SLAC, Menlo Pk, CA 94025 USA. [Baboi, N.] DESY, Hamburg, Germany. [Eddy, N.; Piccoli, L.; Rechenmacher, R.] Fermilab Natl Accelerator Lab, Batavia, IL USA. [Jones, R.] Univ Manchester, Manchester, Lancs, England. RP Molloy, S (reprint author), SLAC, Menlo Pk, CA 94025 USA. EM smolloy@slac.stanford.edu FU US Department of Energy [DE-AC02-76SF00515]; European Community FP6 "Structuring the European Research Area" programme CARE [RII3-CT-2003-506395] FX *Work supported by US Department of Energy Contract DE-AC02- 76SF00515, and by the European Community FP6 "Structuring the European Research Area" programme (CARE, contract number RII3-CT- 2003-506395). 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2344 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302251 ER PT B AU Noble, RJ Colby, ER Cowan, B Sears, CM Siemann, RH Spencer, JE AF Noble, Robert J. Colby, Eric R. Cowan, Benjamin Sears, Christopher M. Siemann, Robert H. Spencer, James E. GP IEEE TI Designing photonic bandgap fibers for particle acceleration SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Photonic bandgap (PBG) fibers with hollow core defects have been suggested for use as laser driven accelerator structures. The modes of a photonic crystal fiber he in a set of allowed bands. A fiber with a central vacuum defect can support so-called defect modes with frequencies in the bandgap and electromagnetic fields confined spatially near the defect. A defect mode suitable for relativistic particle acceleration must have a longitudinal electric field in the central defect and a phase velocity at the speed of light (SOL). We explore the design of the defect geometry to support well confined accelerating modes in such PBG fibers. The dispersion diagram of an accelerating mode must cross the SOL line, and such modes form a special class of defect modes known as surface modes, which are lattice modes of the original PBG crystal that have been perturbed into the bandgap. The details of the surface boundary separating the defect from the surrounding PBG matrix are found to be the critical ingredients for optimizing the accelerator mode properties. C1 [Noble, Robert J.; Colby, Eric R.; Cowan, Benjamin; Sears, Christopher M.; Siemann, Robert H.; Spencer, James E.] Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Noble, RJ (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. EM noble@slac.stanford.edu 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2347 EP 2349 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302252 ER PT B AU Sears, CMS Colby, ER Cowan, B Ischebeck, R McGuinness, CM Noble, R Siemann, RH Spencer, JE Walz, D Byer, RL Plettner, T AF Sears, Chris M. S. Colby, Eric R. Cowan, Ben Ischebeck, Rasmus McGuinness, Chris M. Noble, Robert Siemann, Robert H. Spencer, James E. Walz, Dieter Byer, Robert L. Plettner, Tomas GP IEEE TI Optical wakefield from a Photonic Bandgap fiber accelerator SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Photonic Bandgap (PBG) structures have recently been proposed as optical accelerators for their high coupling impedance and high damage threshold. As a first step in preparing a PBG accelerator, we propose to observe the optical wakefield induced by an electron beam traversing the structure in the absence of a coupled laser pulse. The electrons are focused into the fiber via a permanent magnet quadrupole triplet. The electrons excite fiber modes with speed-of-light (SOL) phase velocities. By observing the wakefield using a spectrometer, the SOL mode frequencies are determined. C1 [Sears, Chris M. S.; Colby, Eric R.; Cowan, Ben; Ischebeck, Rasmus; McGuinness, Chris M.; Noble, Robert; Siemann, Robert H.; Spencer, James E.; Walz, Dieter] SLAC, Menlo Pk, CA 94025 USA. [Byer, Robert L.; Plettner, Tomas] Stanford Univ, Stanford, CA USA. RP Sears, CMS (reprint author), SLAC, Menlo Pk, CA 94025 USA. EM cmsears@slac.stanford.edu FU Department of Energy [DE-AC02-76SF00515, DE-FG06-97ER41276] FX This work is supported by Department of Energy contracts DE-AC02- 76SF00515 and DE-FG06-97ER41276. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2350 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302253 ER PT B AU Seletskiy, S AF Seletskiy, S. GP IEEE TI Compensation of the effect of a detector solenoid on the beam size in the ILC SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB In the International Linear Collider QLQ [1] the colliding beams must be focused to the nanometre size in order to reach the desired luminosity. The method of Weak Antisolenoid is used for the compensation of the effect of the Detector Solenoid on the beam size [2], P]. The studies of this method require the computer simulation of the charged particle's kinematics in the arbitrarily distributed solenoidal, dipole, quadrupole and higher multipole fields. We suggest the mathematical algorithm that allows to optimize parameters of antisolenoid for different configurations of Final Focus magnets and to compensate parasitic effects of the Detector Solenoid on the beam. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Menlo Pk, CA 94025 USA. RP Seletskiy, S (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Menlo Pk, CA 94025 USA. EM seletski@slac.stanford.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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2353 EP 2355 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302254 ER PT B AU Noble, R Spencer, J AF Noble, R. Spencer, J. GP IEEE TI Study of lattice beams and their limitations SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Luminosity from microscale accelerators for high energy physics)face a high premium oil bunch repetition rate and phase space density at the interaction point (IP). The NLC Test Accelerator (NLCTA) at SLAC was built to address such beam dynamics issues. Because an S-Band, RF photoinjector has been installed together with a low-energy, high-resolving power spectrometer (LES), it is useful to explore alternatives to conventional scenarios that can be tested with minimal modifications. Interesting cases include producing simultaneous multiple bunches from the cathode in different formats such as a 2D planar matrix or 31) tensor beam made of smaller bunches or bunchlets that replace a higher charge bunch. We simulate interacting burichlets, n(ij) or n(ijk) coming from the cathode and passing through a solenoid that is either matched to the linac or oil the LES focal plane at 5 MeV. Parmela calculations show mixed space charge and RF effects such as emittance increases for bunchlet charges summing to 50 pC. C1 [Noble, R.; Spencer, J.] SLAC, Menlo Pk, CA 94025 USA. RP Noble, R (reprint author), SLAC, Menlo Pk, CA 94025 USA. EM jus@slac.stanford.edu 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2356 EP 2358 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302255 ER PT B AU Colby, E Ischebeck, R McCormick, D McGuinness, C Nelson, J Noble, R Sears, C Siemann, R Spencer, J Plettner, T AF Colby, E. Ischebeck, R. McCormick, D. McGuinness, C. Nelson, J. Noble, R. Sears, C. Siemann, R. Spencer, J. Plettner, T. GP IEEE TI Beam dynamics measurements for the SLAC laser acceleration experiment SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The NLC Test Accelerator (NLCTA) was built to address beam dynamics issues for the Next Linear Collider and beyond. An S-Band RF gun, diagnostics and low energy spectrometer (LES) at 6 MeV together with a large-angle extraction line at 60 MeV have now been built and commissioned for the laser acceleration experiment, E163. Following a four quad matching section after the NLCTA chicane, the extraction section is followed by another matching section, final focus and buncher. The laser-electron interaction point (IP) is followed by a broad range, high resolving power spectrometer (HES) for electron bunch analysis. Optical symmetries in the design of the 25.5 degrees extraction line provide 1: 1 phase space transfer without sextupoles for a large, 6D phase space volume and range of input conditions. Spot sizes down to a few microns at the IP (HES object) allow testing microscale structures with high resolving power at the HES image. Tolerances, tuning sensitivities, diagnostics and the latest commissioning results are discussed and compared to design expectations. C1 [Colby, E.; Ischebeck, R.; McCormick, D.; McGuinness, C.; Nelson, J.; Noble, R.; Sears, C.; Siemann, R.; Spencer, J.] SLAC, Menlo Pk, CA 94025 USA. [Plettner, T.] Stanford Univ, Stanford, CA 94305 USA. RP Colby, E (reprint author), SLAC, Menlo Pk, CA 94025 USA. EM jus@slac.stanford.edu FU U.S. Dept. of Energy [DE-AC02-76SF00515] FX Supported by U.S. Dept. of Energy contract DE-AC02-76SF00515. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2359 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302256 ER PT B AU Tenenbaum, P Latina, A Smith, JC Kubo, K AF Tenenbaum, P. Latina, A. Smith, J. C. Kubo, K. GP IEEE TI Emittance preservation in the International Linear Collider Ring to Main Linac transfer line SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The very small vertical beam emittance in the International Linear Collider (ILC) can be degraded by dispersion, xy coupling, transverse wakefields, and time-varying transverse fields introduced by elements with misalignments, strength errors, xy rotation errors, or yz rotation errors in the Ring to Main Linac (RTML) transfer line. We present a plan for emittance preservation in this beamline which uses local, quasi-local, and global correction schemes. Results of simulations of the emittance preservation algorithm are also presented and discussed. C1 [Tenenbaum, P.] SLAC, Menlo Pk, CA 94025 USA. [Latina, A.] CERN, Geneva, Switzerland. [Smith, J. C.] CLASSE, Ithaca, NY USA. [Kubo, K.] KEK, Tsukuba, Ibaraki, Japan. RP Tenenbaum, P (reprint author), SLAC, Menlo Pk, CA 94025 USA. EM auarkot@slac.stanford.edu FU The US Department of Energy [DE-AC02-76SF00515, DE-FG02-04ER41352]; National Science Foundation [PHY-0202078] FX Work supported by The US Department of Energy, Contracts DE-AC02-76SF00515 and DE-FG02-04ER41352; US National Science Foundation, Contract PHY-0202078 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2362 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302257 ER PT B AU Zacherl, W Colby, E Plettner, T McGuinness, C AF Zacherl, W. Colby, E. Plettner, T. McGuinness, C. GP IEEE TI Correlating pulses from two spitfire, 800nm lasers SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The E163 laser acceleration experiments conducted at SLAC have stringent requirements on the temporal properties of two regeneratively amplified, 800nm, Spitfire laser systems. To determine the magnitude and cause of timing instabilities between the two Ti:Sapphire amplifiers, we pass the two beams through a cross-correlator and focus the combined beam onto a Hamamatsu G1117 photodiode. The photodiode has a bandgap such that single photon processes are suppressed and only the second order, two-photon process produces an observable response. The response is proportional to the square of the intensity. The diode is also useful as a diagnostic to determine the optimal configuration of the compression cavity. C1 [Zacherl, W.; Colby, E.; Plettner, T.; McGuinness, C.] SLAC, Menlo Pk, CA 94025 USA. RP Zacherl, W (reprint author), SLAC, Menlo Pk, CA 94025 USA. EM wzacherl@slac.stanford.edu 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2365 EP 2367 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302258 ER PT B AU Zhou, F Batygin, Y Liu, W Nosochkov, Y Sheppard, JC Woodley, MD AF Zhou, F. Batygin, Y. Liu, W. Nosochkov, Y. Sheppard, J. C. Woodley, M. D. GP IEEE TI Transport optics design and multi-particle tracking for the ILC positron source SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Undulator-based positron source is adopted as the international Linear Collider baseline design. Complete optics to transport the positron beam having large angular divergence and large energy spread from a thin Ti target to the entrance of the 5 GeV damping ring injection line is developed. Start-to-end multi-particle tracking through the beamline is performed including the optical matching device, capture accelerator system, transport system, superconducting booster linac, spin rotators, and energy compressor. Positron capture efficiency of different schemes (immersed vs shielded target, and flux concentrator vs quarter wave transformation for the optics matching system) is compared. For the scheme of a shielded target and quarter wave transformation, the simulation shows that 15.1% of the positrons from the target are captured within the damping ring 6-D acceptance of A(x) +A(y) <= 0.09 m and Delta E x Delta z <= (+/- 25MeV)x(+/- 3.46cm), at the entrance of the damping ring injection line. C1 [Zhou, F.; Batygin, Y.; Nosochkov, Y.; Sheppard, J. C.; Woodley, M. D.] SLAC, Menlo Pk, CA 94025 USA. [Liu, W.] ANL, Argonne, IL 60439 USA. RP Zhou, F (reprint author), SLAC, Menlo Pk, CA 94025 USA. EM zhoufeng@slac.stanford.edu FU DOE [DE-AC02-76SF00515] FX Work supported by DOE under grant No. DE-AC02-76SF00515 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2368 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302259 ER PT B AU Zhou, F Batygin, Y Brachmann, A Clendenin, J Miller, RH Sheppard, JC Woodley, MD AF Zhou, F. Batygin, Y. Brachmann, A. Clendenin, J. Miller, R. H. Sheppard, J. C. Woodley, M. D. GP IEEE TI Design of a high-current injector and transport optics for the ILC electron source SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB A train of 1.3-ns micro bunches of longitudinally polarized electrons are generated in a 140-kV DC-gun based injector in the International Linear Collider electron source; a bunching system with extremely high bunching efficiency to compress the micro-bunch down to 20 ps FWHM is designed. Complete optics to transport the electron bunch to the entrance of the 5-GeV damping ring injection line is developed. Start-to-end multi-particle tracking through the beamline is performed including the bunching system, pre-acceleration, vertical chicane, 5-GeV superconducting booster linac, spin rotators and energy compressor. With optimizations of energy compression, 94% of the electrons from the DC-gun are captured within the damping ring 6-D acceptance - A(x) + A(y) <= 0.09 m and Delta E x Delta z (+/- 25MeV)x(+/- 3.46cm) - at the entrance of the damping ring injection line. C1 [Zhou, F.; Batygin, Y.; Brachmann, A.; Clendenin, J.; Miller, R. H.; Sheppard, J. C.; Woodley, M. D.] SLAC, Menlo Pk, CA 94025 USA. RP Zhou, F (reprint author), SLAC, Menlo Pk, CA 94025 USA. EM zhoufeng@slac.stanford.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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2371 EP 2373 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302260 ER PT B AU Grames, J Adderley, P Brittian, J Clark, J Hansknecht, J Machie, D Poelker, M Stutzman, ML Suleiman, R Surles-Law, K AF Grames, J. Adderley, P. Brittian, J. Clark, J. Hansknecht, J. Machie, D. Poelker, M. Stutzman, M. L. Suleiman, R. Surles-Law, K. GP IEEE TI Lifetime measurements of high polarization strained-superlattice gallium arsenide at beam current > 1 milliamp using a new 100kv load lock photogun SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB A new GaAs DC high voltage load lock photogun has been constructed at Jefferson Laboratory (JLab), with improved vacuum and photocathode preparation capabilities. As reported previously, this gun was used to study photocathode lifetime with bulk GaAs at DC beam currents between 1 and 10 mA. In this submission, lifetime measurements were performed using high polarization strained-superlattice GaAs photocathode material at beam currents to I mA, with near bandgap light from a fiber based drive laser having picosecond optical pulses and RF time structure. C1 [Grames, J.; Adderley, P.; Brittian, J.; Clark, J.; Hansknecht, J.; Machie, D.; Poelker, M.; Stutzman, M. L.; Suleiman, R.; Surles-Law, K.] Jefferson Lab, Newport News, VA 23606 USA. RP Grames, J (reprint author), Jefferson Lab, Newport News, VA 23606 USA. EM grames@jlab.org 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2374 EP 2376 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302261 ER PT B AU Golge, S Hyde, C Freyberger, A AF Golge, S. Hyde, C. Freyberger, A. GP IEEE TI Simulation of a CW positron source for CEBAF SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB A positron source for the 6 GeV (and 12 GeV upgrade) recirculating linacs at Jefferson Lab is presented. The proposed 100nA CW positron source has several unique characteristics; high incident electron beam power (100kW), 10 MeV/c incident electron beam momentum, CW incident beam and CW production. Positron production with 10 MeV/c electrons has several advantages; the energy is below neutron threshold activation so the production target and the optical system will not become activated during use; CEBAF requires a very low energy spread, so the absolute energy spread is bounded by the low incident energy. These advantages are offset by the large angular distribution of the outgoing positrons. Results of simulations of the positron production and capture are presented. Energy flow, power deposition and thermal management of the elements present a challenge and are included in the simulations. C1 [Golge, S.; Hyde, C.] Old Dominion Univ, Norfolk, VA 23505 USA. [Freyberger, A.] Jefferson Lab, Newport News, VA 23606 USA. RP Golge, S (reprint author), Old Dominion Univ, Norfolk, VA 23505 USA. EM golge@jlab.org FU Jefferson Science Associates, LLC under U.S; DOE [DE-AC05-06OR23177] FX Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177. The U.S. Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce this manuscript for U.S. Government purposes 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2377 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302262 ER PT B AU Graves, V Kirk, H Park, H Tsang, T Fabich, A Efthymiopolous, I Titus, P Carroll, A Spampinato, P McDonald, K AF Graves, V. Kirk, H. Park, H. Tsang, T. Fabich, A. Efthymiopolous, I. Titus, P. Carroll, A. Spampinato, P. McDonald, K. GP IEEE TI Systems testing of a free HG jet system for use in a high-power target experiment SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The design and operational testing of a mercury jet delivery system is presented. The equipment is part of the Mercury Intense Target (MERIT) Experiment, which is a proof-of-principle experiment to be conducted at CERN in the summer of 2007 to determine the feasibility of using an unconstrained jet of mercury as a target in a Neutrino Factory or Muon Collider. The Hg system is capable of producing a 1 cm diameter, 20 m/s jet of Hg inside a high-field solenoid magnet. A high-speed optical diagnostic system allows observation of the interaction of the jet with a 24 GeV proton beam. Performance of the Hg system will be presented, along with results of integrated systems testing without a beam. C1 [Graves, V.; Carroll, A.; Spampinato, P.] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. [Kirk, H.; Park, H.; Tsang, T.] BNL, Upton, NY 11973 USA. [Fabich, A.; Efthymiopolous, I.] CERN, Geneva, Switzerland. [Titus, P.] MIT, Cambridge, MA 02139 USA. [Carroll, A.; Spampinato, P.] ORNL, Oak Ridge, TN 37831 USA. [McDonald, K.] Princeton Univ, Princeton, NJ 08544 USA. RP Graves, V (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. EM gravesvb@ornl.gov FU U.S. Dept of Energy FX Work supported by U.S. Dept of Energy 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2380 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302263 ER PT B AU Meyer, FW Fogle, MR Hale, JW AF Meyer, F. W. Fogle, M. R. Hale, J. W. GP IEEE TI The new ORNL multicharged ion research facility floating beamline SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB We report on the development and implementation of a new beam line at the ORNL Multicharged Ion Research Facility (MIRF) that is floatable at up to -12 kV and injected by a 10 GHz CAPRICE ECR ion source and is part of a major facility upgrade project [1,2]. With the floating beam line operating at negative high voltage, and the ECR source at ground potential, intense dc beam deceleration into grounded experimental chambers to energies as low as a few eV/q is made possible. The primary application of these ion beams is to study fundamental collisional interactions [3] of multicharged ions with electrons, atoms, and surfaces. Design details of the floating beam line, including source extraction, deceleration optics and voltage isolation will be presented at the conference. The novel features of a LABVIEW-based computer control system developed for the floating beam line will be described as well. C1 [Meyer, F. W.; Fogle, M. R.; Hale, J. W.] Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37830 USA. RP Meyer, FW (reprint author), Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37830 USA. EM meyerfw@ornl.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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2383 EP 2385 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302264 ER PT B AU Avrakhov, P Solyak, N AF Avrakhov, P. Solyak, N. GP IEEE TI Superconducting travelling wave ring with high gradient accelerating section SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Use of a superconducting travelling wave accelerating (STWA) structure [1] instead of a standing wave cavity has major advantages in increasing the accelerating gradient in the ILC. In contrast with standing wave cavity STWA requires feedback loop, which sends wave from the structure output to input, making a superconducting travelling wave ring (STWR). One or few input couplers need to excite STWR and compensate power dissipations due to beam loading. To control travelling wave regime in the structure two independent knobs can be used for tuning both resonant ring frequency and backward wave. We discuss two variants of the STWR with one and two feed couplers. C1 [Avrakhov, P.] LLC, Euclid TechLabs, Rockville, MD 20850 USA. [Solyak, N.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Avrakhov, P (reprint author), LLC, Euclid TechLabs, Rockville, MD 20850 USA. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2392 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302267 ER PT B AU Jing, C Kanareykin, A Konecny, R Power, JG Gold, SH Kazakov, S AF Jing, C. Kanareykin, A. Konecny, R. Power, J. G. Gold, S. H. Kazakov, S. GP IEEE TI Progress towards a gap free dielectric-loaded accelerator SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB One of the major concerns in the development of Dielectric-Loaded Accelerating (DLA) structures is the destructive breakdown at dielectric joints caused by a local electric field enhancement induced by the discontinuity of the dielectric constant at the surface of the joint gap. Our previous X-band traveling wave DLA structure design [1], for example, incorporated two separate impedance matching sections with at least two dielectric joints. In this paper, we present a new design to avoid this problem. This scheme is based on a coaxial type coupler which is able to implement mode conversion and impedance matching at the same time and therefore to eliminate joint gap induced breakdown. The new structure is under construction; bench test results will be presented. C1 [Jing, C.; Kanareykin, A.] LLC, Euclid Techlabs, Solon, OH 44139 USA. [Konecny, R.; Power, J. G.] Argonne Natl Lab, Argonne, IL 60439 USA. [Gold, S. H.] Naval Res Lab, Div Plasma Phys, Washington, DC 20375 USA. [Kazakov, S.] KEK, Tsukuba, Ibaraki, Japan. RP Jing, C (reprint author), LLC, Euclid Techlabs, Solon, OH 44139 USA. EM jingchg@hep.anl.gov FU USDoE; SBIR; ONR FX Work supported by USDoE, including a SBIR Phase I grant, and ONR. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2395 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096302268 ER PT B AU Jing, C Kanareykin, A Schoessow, P Power, J Conde, M Yusof, Z Gai, W AF Jing, C. Kanareykin, A. Schoessow, P. Power, J. Conde, M. Yusof, Z. Gai, W. GP IEEE TI High transformer ratios in collinear wakefield accelerators SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Based on our previous experiment that successfully demonstrated wakefield transformer ratio enhancement in a 13.625 GHz dielectric-loaded collinear wakefield accelerator using the ramped bunch train technique, we present here a redesigned experimental scheme for even higher enhancement of the efficiency of this accelerator. Design of a collinear wakefield device with a transformer ratio R>>2, is presented. Using a ramped bunch train (RBT) rather than a single drive bunch, the enhanced transformer ratio (ETR) technique is able to increase the transformer ratio R above the ordinary limit of 2. To match the wavelength of the fundamental mode of the wakefield with the bunch length (sigma(z)=2 mm) of the new Argonne Wakefield Accelerator (AWA) drive gun (where the experiment will be performed), a 26.625 GHz dielectric based accelerating structure is required. This transformer ratio enhancement technique based on our dielectric-loaded waveguide design will result in a compact, high efficiency accelerating structures for future wakefield accelerators. C1 [Jing, C.; Kanareykin, A.; Schoessow, P.] Eculid Techlabs LLC, Solon, OH 44139 USA. [Power, J.; Conde, M.; Yusof, Z.; Gai, W.] Argonne Natl Lab, Argonne, IL 60439 USA. RP Jing, C (reprint author), Eculid Techlabs LLC, Solon, OH 44139 USA. EM jingchg@hep.anl.gov FU DOE SBIR FX Work submitted to DOE SBIR Phase I Funding. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2398 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303001 ER PT B AU Kanareykin, A Schoessow, P Conde, M Jing, C Gai, W AF Kanareykin, A. Schoessow, P. Conde, M. Jing, C. Gai, W. GP IEEE TI Progress towards development of a diamond-based cylindrical dielectric accelerating structure SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB In this report, we present our recent developments on a high gradient diamond-based cylindrical dielectric loaded accelerator (DLA). The final goal of this research is to achieve a record accelerating gradient (similar to 600 MV/m) in a demonstration of the structure at high power and with accelerated beam. We discuss here a new technology for the development of cylindrical diamond-based waveguides and the design, fabrication and high power testing of a cylindrical diamond-based DLA accelerating structure. The electrical and mechanical properties of diamond make it an ideal candidate material for use in dielectric accelerators: high RF breakdown level, extremely low dielectric losses and the highest thermoconductive coefficient available. Multipacting of the CVD diamond can be suppressed by diamond surface dehydrogenation. A plasma supported Chemical Vapor Deposition (CVD) technology to produce low loss high quality cylindrical diamond layers is presented. Special attention is devoted to the numerical optimization, where the surface magnetic and electric fields are minimized relative to the accelerating gradient and within known metal surface breakdown limits. C1 [Kanareykin, A.; Schoessow, P.] Euclid Techlabs LLC, Solon, OH USA. Coating Technol Solut Inc, Somerville, MA USA. [Conde, M.; Jing, C.; Gai, W.] Argonne Natl Lab, Argonne, IL USA. RP Kanareykin, A (reprint author), Euclid Techlabs LLC, Solon, OH USA. EM alexkan@euclidtechlabs.com FU US Department of Energy FX This work is supported by the US Department of Energy. We appreciate the assistance of Dr. J.Butler and Dr. P.W.May 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2407 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303004 ER PT B AU Schoessow, P Kanareykin, A Bagryanskaya, E Gorelik, V Kovshik, A Tyukhtin, AV Yevlampieva, N Antipov, S Gai, W Conde, M Power, JG AF Schoessow, P. Kanareykin, A. Bagryanskaya, E. Gorelik, V. Kovshik, A. Tyukhtin, A. V. Yevlampieva, N. Antipov, S. Gai, W. Conde, M. Power, J. G. GP IEEE TI Status of the microwave PASER experiment SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The PASER is a new method for particle acceleration, in which energy from an active medium is transferred to a charged particle beam The effect is similar to the action of a maser or laser with the stimulated emission of radiation being produced by the virtual photons in the electromagnetic field of the beam We are developing a demonstration PASER device operating at X-band, based on the availability of a new class of active materials that exhibit photoinduced electron spin polarization. We will report on the status of active material development and measurements, numerical simulations, and preparations for microwave PASER experiments at the Argonne Wakefield Accelerator facility. C1 [Schoessow, P.; Kanareykin, A.] Euclid Techlabs LLC, Rockville, MD USA. [Bagryanskaya, E.; Gorelik, V.] Int Tomography Ctr, Novosibirsk, Russia. [Kovshik, A.; Tyukhtin, A. V.; Yevlampieva, N.] St Petersburg State Univ, St Petersburg, Russia. [Antipov, S.; Gai, W.; Conde, M.; Power, J. G.] Argonne Natl Lab, Argonne, IL USA. RP Schoessow, P (reprint author), Euclid Techlabs LLC, Rockville, MD USA. EM paul.schoessow@euclidtechlabs.com FU DOE SBIR FX Work supported by DOE SBIR Phase II Funding 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2410 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303005 ER PT B AU Plettner, T Byer, RL Colby, E Ischebeck, R McGuinness, C Noble, R Sears, CMS Siemann, RH Spencer, J Walz, D AF Plettner, T. Byer, R. L. Colby, E. Ischebeck, R. McGuinness, C. Noble, R. Sears, C. M. S. Siemann, R. H. Spencer, J. Walz, D. GP IEEE TI Inverse-transition radiation laser acceleration experiments at slac SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB We present a series of laser-driven particle acceleration experiments that are aimed at studying laser-particle acceleration as an inverse-radiation process. To this end we employ a semi-open vacuum setup with a thin planar boundary that interacts with the laser and the electromagnetic field of the electron beam. Particle acceleration from different types of boundaries will be studied and compared to the theoretical expectations from the Inverse-radiation picture and the field path integral method. We plan to measure the particle acceleration effect from transparent, reflective, black, and rough surface boundaries. While the agreement between the two acceleration pictures is straightforward to prove analytically for the transparent and reflective boundaries the equivalence is not clear-cut for the absorbing and rough-surface boundaries. Experimental observation may provide the evidence to distinguish between the models. C1 [Plettner, T.; Byer, R. L.] Stanford Univ, Stanford, CA 94305 USA. [Colby, E.; Ischebeck, R.; McGuinness, C.; Noble, R.; Sears, C. M. S.; Siemann, R. H.; Spencer, J.; Walz, D.] Stanford Linear Accelerator Ctr, Menlo Pk, CA USA. RP Plettner, T (reprint author), Stanford Univ, Stanford, CA 94305 USA. EM tplettne@stanford.edu FU [DOE FG-06-97ER41276]; [DE-AC02-76SF00515] FX Work supported by DOE FG-06-97ER41276 and DE-AC02-76SF00515 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2416 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303007 ER PT B AU Summer, DJ Cremaldi, LM Godang, R Kipapa, BR Rice, HE Palmer, RB AF Summer, D. J. Cremaldi, L. M. Godang, R. Kipapa, B. R. Rice, H. E. Palmer, R. B. GP IEEE TI Muon acceleration to 750 GeV in the Tevatron tunnel for a 1.5 TeV mu(+)mu(-) collider SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE ID SYNCHROTRON; SIMULATIONS AB Muon acceleration from 30 to 750 GeV in 72 orbits using two rings in the 1000 m radius Tevatron tunnel is explored. The first ring ramps at 400 Hz and accelerates muons from 30 to 400 GeV in 28 orbits using 14 GV of 1.3 GHz superconducting RF. The ring duplicates the Fermilab 400 GeV main ring FODO lattice, which had a 61 m cell length. Muon survival is 80%. The second ring accelerates muons from 400 to 750 GeV in 44 orbits using 8 GV of 1.3 GHz superconducting RF. The 30 T/m main ring quadrupoles are lengthened 87% to 3.3 m. The four main ring dipoles in each half cell are replaced by three dipoles which ramp at 550 Hz from -1.8T to +1.8T interleaved with two 8 T fixed superconducting dipoles. The ramping and superconducting dipoles oppose each other at 400 GeV and act in unison at 750 GeV. Muon survival is 92%. Two mm copper wire, 0.28 mm grain oriented silicon steel laminations, and a low duty cycle mitigate eddy current losses. Low emittance muon bunches allow small aperatures and permit magnets to ramp with a few thousand volts. Little civil construction is required. The tunnel exists. C1 [Summer, D. J.; Cremaldi, L. M.; Godang, R.; Kipapa, B. R.; Rice, H. E.] Univ Mississippi, University, MS 38677 USA. [Palmer, R. B.] Brookhaven Natl Lab, Upton, NY 11973 USA. RP Summer, DJ (reprint author), Univ Mississippi, University, MS 38677 USA. EM summers@phy.olemiss.edu FU [DE-FG02-91ER40622]; [DE-AC02-98CH10886] FX Supported by DE-FG02-91ER40622 and DE-AC02-98CH10886. NR 56 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2422 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303009 ER PT B AU Berg, JS Ruggiero, A Machida, S Koscielniak, S AF Berg, J. Scott Ruggiero, Alessandro Machida, Shinji Koscielniak, Shane GP IEEE TI The EMMA lattice design SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB EMMA is a 10 to 20 MeV electron ring designed to test our understanding of beam dynamics in a relativistic linear non-scaling fixed field alternating gradient accelerator (FFAG). This paper describes the design of the EMMA lattice. We begin with a summary of the experimental goals that impact the lattice design, and then outline what motivated the choice for the basic lattice parameters, such as the type of cells, the number of cells, and the RF frequency. We next list the different configurations that we wish to operate the machine in so as to accomplish our experimental goals. Finally, we enumerate the detailed lattice parameters, showing how these parameters result from the various lattice configurations. C1 [Berg, J. Scott; Ruggiero, Alessandro] Brookhaven Natl Lab, Upton, NY 11973 USA. [Machida, Shinji] ASTeC, STFC RAL, Chilton, England. [Koscielniak, Shane] TRIUMF, Vancouver, BC, Canada. RP Berg, JS (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. RI Berg, Joseph/E-8371-2014 OI Berg, Joseph/0000-0002-5955-6973 FU United States Department of Energy [DE-AC02-98CH10886] FX Work Supported by the United States Department of Energy, Contract No. DE-AC02-98CH10886. NR 10 TC 1 Z9 1 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2425 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303010 ER PT B AU Hershcovitch, A Weng, W Diwan, M Gallardo, J Kirk, H Johnson, B Kahn, S Garate, E Van Drie, A Rostoker, N AF Hershcovitch, A. Weng, W. Diwan, M. Gallardo, J. Kirk, H. Johnson, B. Kahn, S. Garate, E. Van Drie, A. Rostoker, N. GP IEEE TI Plasma lens for us based super neutrino beam at either FNAL or BNL SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE ID TRANSPORT AB The plasma lens concept is examined as an alternative to focusing horns and solenoids for a neutrino beam facility. The concept is based on a combined high-current lens/target configuration. Current is fed at an electrode located downstream from the beginning of the target where pion capturing is needed. The current is carried by plasma outside the target. A second plasma lens section, with an additional current feed, follows the target. The plasma is immersed in a relatively small solenoidal magnetic field to facilitate its current profile shaping to optimize pion capture. Simulations of the not yet fully optimized configuration yielded a 25% higher neutrino flux at a detector situated at 3 km from the target than the horn system for the entire enegry spectrum and a factor of 2.47 higher flux for neutrinos with energy larger than 3 GeV. A major advantage of plasma lenses is in background reduction. In anti-neutrino operation, neutrino background is reduced by a factor of close to 3 for the whole spectrum, and for and for energy larger than 3 GeV, neutrino background is reduced by a factor of 3.6. Plasma lenses have additional advantages: larger axial currents, high signal purity: minimal neutrino background in anti-neutrino runs. The lens medium consists of plasma, consequently, particle absorption and scattering is negligible. Withstanding high mechanical and thermal stresses in a plasma is not an issue. C1 [Hershcovitch, A.; Weng, W.; Diwan, M.; Gallardo, J.; Kirk, H.; Johnson, B.] Brookhaven Natl Lab, Upton, NY 11973 USA. [Kahn, S.] Muons Inc, Batavia, IL 60510 USA. [Garate, E.; Van Drie, A.; Rostoker, N.] Univ Calif Irvine, Irvine, CA 92697 USA. RP Hershcovitch, A (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. EM hershcovitch@bnl.gov FU Brookhaven Science Associates, LLC [DE-AC02-98CH1-886] FX This manuscript has been authored by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH1-886 with the US Department of Energy. The Untied States Government retains, and the publisher, by accepting the article for publication, acknowledges, a world-wide license to publish or reproduce the published form of this manuscript, or others to do so, for the United States Government purposes. NR 16 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2428 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303011 ER PT B AU Kewisch, J Chang, X AF Kewisch, Joerg Chang, Xiangyun GP IEEE TI Low emittance electron beams for the RHIC electron cooler SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB An electron cooler, based on an Energy Recovery Linac (ERL) is under development for the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory. This will be the first electron cooler operating at high energy with bunched beams. In order to achieve sufficient cooling of the ion beams the electron have to have a charge of 5 nC and a normalized emittance less than 4 mu. This paper presents the progress in optimizing the injector and the emittance improvements from shaping the charge distribution in the bunch. C1 [Kewisch, Joerg; Chang, Xiangyun] Brookhaven Natl Lab, Upton, NY 11973 USA. RP Kewisch, J (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2431 EP 2433 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303012 ER PT B AU Kewisch, J Chang, XY AF Kewisch, Joerg Chang, Xiangyun GP IEEE TI Emittance compensation for magnetized beams SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Emittance compensation is a well established technique [1] for minimizing the emittance of an electron beam from a RF photo-cathode gun. Longitudinal slices of a bunch have a small emittance, but due to the longitudinal charge distribution of the bunch and time dependent RF fields they are not focused in the same way, so that the direction of their phase ellipses diverges in phase space and the projected emittance is much larger. Emittance compensation reverses the divergence. At the location where the slopes of the phase ellipses coincide the beam is accelerated, so that the space charge forces are reduced. A recipe for emittance compensation is given in [2]. For magnetized beams (where the angular momentum is non-zero) such emittance compensation is not sufficient because variations in the slice radius lead to variations in the angular speed and therefore to an increase of emittance in the rotating frame. We describe a method and tools for a compensation that includes the beam magnetization. C1 [Kewisch, Joerg; Chang, Xiangyun] Brookhaven Natl Lab, Upton, NY 11973 USA. RP Kewisch, J (reprint author), Brookhaven Natl Lab, Upton, NY 11973 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2434 EP 2436 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303013 ER PT B AU Palmer, RB Berg, JS Fernow, RC Gallardo, JC Kirk, HG Alexahin, Y Neuffer, D Kahn, SA Summers, D AF Palmer, Robert B. Berg, J. Scott Fernow, Richard C. Gallardo, Juan Carlos Kirk, Harold G. Alexahin, Yuri Neuffer, David Kahn, Stephen Alan Summers, Don GP IEEE TI A complete scheme of ionization cooling for a muon collider SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB A complete scheme for production and cooling a muon beam for three specified muon colliders is presented. Parameters for these muon colliders are given. The scheme starts with the front end of a proposed neutrino factory that yields bunch trains of both muon signs. Emittance exchange cooling in slow helical lattices reduces the longitudinal emittance until it becomes possible to merge the trains into single bunches, one of each sign. Further cooling in all dimensions is applied to the single bunches in further slow helical lattices. Final transverse cooling to the required parameters is achieved in 50 T solenoids using high T-C superconductor at 4 K. Preliminary simulations of each element are presented. [GRAPHICS] C1 [Palmer, Robert B.; Berg, J. Scott; Fernow, Richard C.; Gallardo, Juan Carlos; Kirk, Harold G.] Brookhaven Natl Lab, Upton, NY 11973 USA. [Alexahin, Yuri; Neuffer, David] Fermilab Natl Accelerator Lab, Batavia, IL USA. [Kahn, Stephen Alan] Munos Inc, Batavia, IL USA. [Summers, Don] Univ Mississippi, Oxford, MS USA. RP Palmer, RB (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. RI Berg, Joseph/E-8371-2014 OI Berg, Joseph/0000-0002-5955-6973 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2437 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303014 ER PT B AU Parker, B Anerella, M Escallier, J He, P Jain, A Marone, A Nosochkov, Y Seryi, A AF Parker, B. Anerella, M. Escallier, J. He, P. Jain, A. Marone, A. Nosochkov, Y. Seryi, A. GP IEEE TI The superconducting magnets of the ILC beam delivery system SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The ILC Beam Delivery System (BDS) uses a variety of superconducting magnets to maximize luminosity and minimize background. Compact final focus quadrupoles with multifunction correction coils focus incoming beams to few nanometer spot sizes while focusing outgoing disrupted beams into a separate extraction beam line. Anti-solenoids mitigate effects from overlapping focusing and the detector solenoid field. Far from the interaction point (IP) strong octupoles help minimize IP backgrounds. A low-field but very large aperture dipole is integrated with the detector solenoid to reduce backgrounds from beamstrahlung pairs generated at the IP. Physics requirements and magnetic design solutions for the BDS superconducting magnets are reviewed in this paper. C1 [Parker, B.; Anerella, M.; Escallier, J.; He, P.; Jain, A.; Marone, A.] Brookhaven Natl Lab, Upton, NY 11973 USA. [Nosochkov, Y.; Seryi, A.] SLAC, Menlo Pk, CA 94025 USA. RP Parker, B (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. EM parker@bnl.gov FU Brookhaven Science Associates, LLC [DE-AC02-98CH1-886] FX This manuscript has been authored by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH1-886 with U.S. Department of Energy. The United States Government retains, and the publisher, by accepting article for publication, acknowledges, a world-wide license to publish or reproduce published form of this manuscript, or allow others to do so, for the United states Government purposes. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2440 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303015 ER PT B AU Trbojevic, D Gupta, R Parker, B Keil, E Sessler, AM AF Trbojevic, D. Gupta, R. Parker, B. Keil, E. Sessler, A. M. GP IEEE TI Superconducting non-scaling FFAG gantry for carbon/proton cancer therapy SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB We report on improvements in the non-scaling Fixed Field Alternating Gradient (FFAG) gantry design. As we previously reported [1], a major challenge of the carbon/proton cancer therapy facilities is in the isocentric gantry design. The weight of the isocentric gantry transport elements in the latest Heidelberg carbon/proton facility is 135 tons [4]. In this report we detail improvements to the previous non-scaling gantry design. We estimate that this non-scaling FFAG gantry would be almost a hundred times fighter than traditional heavy ion gantries. Very strong focusing with small dispersion permits passage of different energies of carbon beams through the gantry's fixed magnetic field. C1 [Trbojevic, D.; Gupta, R.; Parker, B.] Brookhaven Natl Lab, Upton, NY 11973 USA. [Keil, E.] CERN, CH-1211 Geneva 23, Switzerland. RP Trbojevic, D (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. FU United States Department of Energy [DE-AC02-98CH1-886] FX Work performed under the United States Department of Energy Contract No. DE-AC02-98CH1-886 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2443 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303016 ER PT B AU Trbojevic, D AF Trbojevic, D. GP IEEE TI Muon acceleration with the racetrack FFAG SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Muon acceleration for muon collider or neutrino factory is still in a stage where further improvements are likely as a result of further study. This report presents a design of the racetrack non-scaling Fixed Field Alternating Gradient (NS-FFAG) accelerator to allow fast muon acceleration in small number of turns. The racetrack design is made of four arcs: two arcs at opposite sides have a smaller radius and are made of closely packed combined function magnets, while two additional arcs, with a very large radii, are used for muon extraction, injection, and RF accelerating cavities. The ends of the large radii arcs are geometrically matched at the connections to the arcs with smaller radii. The dispersion and both horizontal and vertical amplitude functions are matched at the central energy. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Trbojevic, D (reprint author), Brookhaven Natl Lab, Upton, NY 11973 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2446 EP 2448 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303017 ER PT B AU Trbojevic, D Berg, SJ Ben-Zvi, I Blaskiewicz, M Litvinenko, V MacKay, W Ptitsyn, V Roser, T Ruggiero, AG AF Trbojevic, D. Berg, S. J. Ben-Zvi, I. Blaskiewicz, M. Litvinenko, V. MacKay, W. Ptitsyn, V. Roser, T. Ruggiero, A. G. GP IEEE TI Acceleration of electrons with the racetrack nonscaling FFAG for e-RHIC SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The future relativistic electron hadron collider: e-RHIC requires acceleration of electrons to 10 GeV with a possible upgrade to 20 GeV. In the case that the super conducting linac is selected for acceleration, an energy recovery scheme is required. We propose to study a possibility of using the non-scaling Fixed-Field Gradient-Accelerator (NS-FFAG) for different energies. The beam will be accelerated by the superconducting linac at the top of the sine function, brought back to the front of the linac by the non-scaling FFAG and repeating this a few times until the total energy of 20 GeV is reached. After collisions the beam is brought back by the non-scaling FFAG and decelerated (on the lower RF phase) in the same sequence but in the reverse order. Conventional and non-conventional beam dynamic issues will be discussed, like the transit time matching effect and the time of flight adjustments. C1 [Trbojevic, D.; Berg, S. J.; Ben-Zvi, I.; Blaskiewicz, M.; Litvinenko, V.; MacKay, W.; Ptitsyn, V.; Roser, T.; Ruggiero, A. G.] Brookhaven Natl Lab, Upton, NY 11973 USA. RP Trbojevic, D (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. RI Berg, Joseph/E-8371-2014 OI Berg, Joseph/0000-0002-5955-6973 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2449 EP 2451 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303018 ER PT B AU Pogorelsky, IV Yakimenko, VE AF Pogorelsky, I. V. Yakimenko, V. E. GP IEEE TI Experimental demonstration of feasibility of a polarized gamma-source for ILC based on Compton backscattering inside a CO(2) laser cavity SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Compton interaction point incorporated into a laser cavity is the key element of the Polarized Positron Source (PPS) concept proposed for ILC in [1]. According to this proposal, circularly polarized gamma rays are produced via Compton backscattering from a linac's electron beam (e(-)-beam) inside a CO(2) laser amplifier cavity. Intra-cavity positioning of the interaction point (IP) allows laser energy recycling to match the electron beam format. We conducted experimental tests of multi-pulse operation of such active Compton cavity upon injection of a picosecond CO(2) laser beam. Together with earlier demonstration of a high x-ray yield via the e(-)-beam/CO(2)-laser backscattering, these new results show a viability of the entire PPS concept and closely prototype the laser source requirements for ILC. C1 [Pogorelsky, I. V.; Yakimenko, V. E.] Brookhaven Natl Lab, Upton, NY 11973 USA. RP Pogorelsky, IV (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. EM yakimenko@bnl.gov 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2452 EP 2454 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303019 ER PT B AU Gold, SH Kinkead, AK Gai, W Power, JG Konecny, R Long, J Jing, C Tantawi, SG Nantista, CD AF Gold, S. H. Kinkead, A. K. Gai, W. Power, J. G. Konecny, R. Long, J. Jing, C. Tantawi, S. G. Nantista, C. D. GP IEEE TI Development of a dielectric-loaded test accelerator SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB This paper presents a progress report on a joint project by the Naval Research Laboratory (NRL) and Argonne National Laboratory (ANL), in collaboration with the Stanford Linear Accelerator Center (SLAC) and Euclid Techlabs, LLC, to develop an X-band dielectric-loaded test accelerator in the NRL Magnicon Facility. The magnicon is a high-power 11.4-GHz amplifier tube that can produce up to 25 MW of power in 200-ns pulses at up to 10 Hz. The dielectric accelerating structures are developed by ANL and Euclid Techlabs, and tested at NRL and SLAC. The accelerator will include a 5-MeV electron injector developed by the Accelerator Laboratory of Tsinghua University, Beijing, China. SLAC has developed a means to combine the two magnicon output arms, in order to drive an injector and accelerator with separate control of the power ratio and relative phase. The initial operation of the injector should take place later this year, and the first test with a DLA structure, and a spectrometer should take place within the next year. C1 [Gold, S. H.] USN, Res Lab, Div Plasma Phys, Washington, DC 20375 USA. [Kinkead, A. K.] LET Corp, Washington, DC 20007 USA. [Gai, W.; Power, J. G.; Konecny, R.; Long, J.] Argonne Natl Lab, Argonne, IL 60439 USA. [Jing, C.] Euclid Tech Labs LLC, Cleveland, OH 44139 USA. [Tantawi, S. G.; Nantista, C. D.] Stanford Linear Accelerator Ctr, Menlo Pk, CA 94025 USA. RP Gold, SH (reprint author), USN, Res Lab, Div Plasma Phys, Washington, DC 20375 USA. FU Office of High Energy Physics, US Department of Energy; US Office of Naval Research FX Work supported by Office of High Energy Physics, US Department of Energy and US Office of Naval Research. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2455 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303020 ER PT B AU Plum, MA AF Plum, M. A. GP IEEE TI Commissioning of the spallation neutron source accelerator systems SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The Spallation Neutron Source accelerator complex consists of a 2.5 MeV H(-) front-end injector system, a 186 MeV normal-conducting linear accelerator, a 1 GeV superconducting linear accelerator, an accumulator ring, and associated beam transport lines. The linac was commissioned in five discrete runs, starting in 2002 and completed in 2005. The accumulator ring and associated beam transport lines were commissioned in two runs from January to April 2006. With the completed commissioning of the SNS accelerator, the facility has begun initial low-power operations. In the course of beam commissioning, most beam performance parameters and beam intensity goals have been achieved at low duty factor. A number of beam dynamics measurements have been performed, including transverse coupling in the ring, beam instability thresholds, and beam distributions on the target. The commissioning results, achieved beam performance and initial operating experience of the SNS will be discussed. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Plum, MA (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN 37831 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2471 EP 2475 PG 5 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303024 ER PT B AU Krejcik, P AF Krejcik, P. GP IEEE TI Diagnostics for commissioning LCLS SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE C1 SLAC, Menlo Pk, CA 94025 USA. RP Krejcik, P (reprint author), SLAC, Menlo Pk, CA 94025 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2481 EP 2481 PG 1 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303026 ER PT B AU Russo, T Bellavia, S Gassner, D Thieberger, R Trbojevic, D Tsang, I AF Russo, T. Bellavia, S. Gassner, D. Thieberger, R. Trbojevic, D. Tsang, I. GP IEEE TI The RHIC hydrogen jet luminescence monitor SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB A hydrogen jet polarimeter was developed for the RHIC accelerator to improve the process of measurmig polarization. Particle beams intersecting with gas molecules can produce light by the process known as luminescence. This light can then be focused, collected, and processed giving important information such as size, position, emittance, motion, and other parameters. The RHIC hydrogen jet polarimeter was modified in 2005 with specialized optics, vacuum windows, light transport, and a new camera system making it possible to monitor the luminescence produced by polarized protons intersecting the hydrogen beam. This paper describes the configuration and preliminary measurements taken using the RHIC hydrogen jet polarimeter as a luminescence monitor. C1 [Russo, T.; Bellavia, S.; Gassner, D.; Thieberger, R.; Trbojevic, D.; Tsang, I.] Brookhaven Natl Lab, Upton, NY 11973 USA. RP Russo, T (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2502 EP 2506 PG 5 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303031 ER PT B AU Hegelich, BM AF Hegelich, B. M. GP IEEE TI Ultra-high intensity laser acceleration of ions to MeV/nucleon energies SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE C1 LANL, Los Alamos, NM USA. RP Hegelich, BM (reprint author), LANL, Los Alamos, NM USA. NR 0 TC 0 Z9 0 U1 1 U2 3 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2512 EP 2512 PG 1 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303033 ER PT B AU Danilov, V Aleksandrov, S Assadi, S Blokland, W Cousineau, S Deibele, C Grice, W Henderson, S Holmes, J Liu, Y Plum, M Shishlo, A Webster, A Nesterenko, IN Waxer, L AF Danilov, V. Aleksandrov, S. Assadi, S. Blokland, W. Cousineau, S. Deibele, C. Grice, W. Henderson, S. Holmes, J. Liu, Y. Plum, M. Shishlo, A. Webster, A. Nesterenko, I. N. Waxer, L. GP IEEE TI Laser stripping of H- beams: Theory and experiments SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Thin carbon foils are used as strippers for charge exchange injection into high intensity proton rings. However, the stripping foils become radioactive and produce uncontrolled beam loss, which is one of the main factors limiting beam power in high intensity proton rings. Recently, we presented a scheme for laser stripping an H- beam for the Spallation Neutron Source ring. First, H- atoms are converted to H-0 by a magnetic field, then H-0 atoms are excited from the ground state to the upper levels by a laser, and the excited states are converted to protons by a second magnetic field. In this paper we report on the first successful proof-of-principle demonstration of this scheme to give high efficiency (around 90%) conversion of If beam into protons at SNS in Oak Ridge. In addition, future plans on building a practical laser stripping device are discussed. C1 [Danilov, V.; Aleksandrov, S.; Assadi, S.; Blokland, W.; Cousineau, S.; Deibele, C.; Grice, W.; Henderson, S.; Holmes, J.; Liu, Y.; Plum, M.; Shishlo, A.; Webster, A.] ORNL, Oak Ridge, TN 37831 USA. RP Danilov, V (reprint author), ORNL, Oak Ridge, TN 37831 USA. EM danilovs@ornl.gov RI Grice, Warren/L-8466-2013 FU Laboratory Directed Research and Development Program of Oak Ridge National Laboratory; U. S. Department of Energy [DE-AC05-00OR22725] FX Research sponsored by Laboratory Directed Research and Development Program of Oak Ridge National Laboratory, managed by UT-Battelle, LLC, for the U. S. Department of Energy under Contract No. DE-AC05-00OR22725. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2513 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303034 ER PT B AU Zwaska, RM Adamson, P Childress, SC Hylen, J Kobilarcik, T Koizumi, GM Lucas, PW Marchionni, A Martens, MA AF Zwaska, R. M. Adamson, P. Childress, S. C. Hylen, J. Kobilarcik, T. Koizumi, G. M. Lucas, P. W. Marchionni, A. Martens, M. A. GP IEEE TI Status of the NuMI neutrino beam at Fermilab SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE C1 [Zwaska, R. M.; Adamson, P.; Childress, S. C.; Hylen, J.; Kobilarcik, T.; Koizumi, G. M.; Lucas, P. W.; Marchionni, A.; Martens, M. A.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Zwaska, RM (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2530 EP 2530 PG 1 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303039 ER PT B AU Schietinger, T Adelmann, A Bakker, RJ Kraus, C Li, K Oppelt, A Oswald, B Pedrozzi, M Raguin, JY Stulle, F Wrulich, AF Qiang, J AF Schietinger, T. Adelmann, A. Bakker, R. J. Kraus, C. Li, K. Oppelt, A. Oswald, B. Pedrozzi, M. Raguin, J. -Y Stulle, F. Wrulich, A. F. Qiang, Ji GP IEEE TI Beam dynamics of the 250 MeV PSI XFEL injector SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The PSI XFEL project aims at developing a pulsed high-brightness, high-current electron source which is one of the prerequisites of a cost-effective high-power laser-like Xray light source. Creating an ultra low emittance beam is a great challenge, transporting, i.e., accelerating and compressing it is equally difficult. We present a 3D start-to-end simulation of our planned 250 MeV injector facility. The injector consists of a photocathode with pulsed DC acceleration followed by a two-cell standing-wave L-band cavity that leads into a ballistic bunching section. After some further velocity bunching in an L-band structure the electron beam enters several S-band structures which accelerate it up to the final energy of 250 MeV. An X-band RF structure prepares the beam for the following bunch compressor in which the target peak current of 350 A is reached. The target value of the slice emittance is 0.1 mm mrad, necessitating precise beam dynamics simulations. For the 3D simulations we use IMPACT-T, a time domain parallel particle tracking code, in which the self fields are treated in the electrostatic approximation. We discuss various issues such as projected and slice emittance preservation and shed light on some of the differences between an envelope and the 3D model. C1 [Schietinger, T.; Adelmann, A.; Bakker, R. J.; Kraus, C.; Li, K.; Oppelt, A.; Oswald, B.; Pedrozzi, M.; Raguin, J. -Y; Stulle, F.; Wrulich, A. F.] Paul Scherrer Inst, CH-5232 Villigen, Switzerland. [Qiang, Ji] LBNL, Berkeley, CA 94720 USA. RP Schietinger, T (reprint author), Paul Scherrer Inst, CH-5232 Villigen, Switzerland. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2534 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303041 ER PT B AU Zhou, F Agustsson, RB Andonian, G Cline, DB Kabel, AC Murokh, AY Rosenzweig, JB Yakimenko, V AF Zhou, F. Agustsson, R. B. Andonian, G. Cline, D. B. Kabel, A. C. Murokh, A. Y. Rosenzweig, J. B. Yakimenko, V. GP IEEE TI Experimental characterization of the transverse phase space of a 60-MeV electron beam through a compressor chicane SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE C1 [Zhou, F.; Kabel, A. C.] SLAC, Menlo Pk, CA 94025 USA. [Agustsson, R. B.; Andonian, G.; Cline, D. B.; Murokh, A. Y.; Rosenzweig, J. B.] Univ Calif Los Angeles, Los Angeles, CA 90024 USA. [Yakimenko, V.] BNL, Upton, Long isl, New York, NY USA. RP Zhou, F (reprint author), SLAC, Menlo Pk, CA 94025 USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2537 EP 2537 PG 1 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303042 ER PT B AU Cousineau, S Assadi, S Holmes, J Plum, MA AF Cousineau, S. Assadi, S. Holmes, J. Plum, M. A. GP IEEE TI Experimental characterization of the spallation neutron source accumulator ring collimation system SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The SNS ring and associated transport lines, commissioned in January 2006, are designed to accumulate and deliver up to 1.5e14, 1 GeV protons at 60 Hz to a liquid mercury target for neutron production. In order to control activation and to allow for routine hands-on maintenance of accelerator components, beam loss in most of the ring must remain below 1 W/m. For the full 1.4 MW beam, this translates to a fractional beam loss limit of 0.02%. Accomplishing this loss limit at full beam power will require successful utilization of the ring's two-stage betatron collimation system. In this paper we present the results of initial collimation experiments. We characterize the collimation-induced beam-loss pattern and compare our results with simulations. C1 [Cousineau, S.; Assadi, S.; Holmes, J.; Plum, M. A.] Oak Ridge Natl Lab, SNS, Oak Ridge, TN 37830 USA. RP Cousineau, S (reprint author), Oak Ridge Natl Lab, SNS, Oak Ridge, TN 37830 USA. 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 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2544 EP 2546 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303045 ER PT B AU Johnson, RP Derbenev, Y AF Johnson, Rolland P. Derbenev, Yaroslav GP IEEE TI Low emittance Muon colliders SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Advances in ionization cooling, phase space manipulations, and technologies to achieve high brightness muon beams are stimulating designs of high-luminosity energy-frontier muon colliders. Simulations of Helical Cooling Channels (HCC) show impressive emittance reductions, new ideas on reverse emittance exchange and muon bunch coalescing are being developed, and high-field superconductors show great promise to improve the effectiveness of ionization cooling. Experiments to study RF cavities pressurized with hydrogen gas in strong magnetic fields have had encouraging results. A 6-dimensional HCC demonstration experiment is being designed and a 1.5 TeV muon collider is being studied at Fermilab. Two new synergies are that very cool muon beams can be accelerated in ILC RF structures and that this capability can be used both for muon colliders and for neutrino factories. These advances are discussed in the context of muon colliders with small transverse emittances and with fewer muons to ease requirements on site boundary radiation, detector backgrounds, and muon production. Compared to studies done 10 years ago where larger bunch intensities were assumed, there now are more possibilities for acceleration, low beta insertions, and detector designs. C1 [Johnson, Rolland P.] Muons Inc, Batavia, IL 60510 USA. [Derbenev, Yaroslav] Jefferson Lab, Newport News, VA 23606 USA. RP Johnson, RP (reprint author), Muons Inc, Batavia, IL 60510 USA. EM rol@muonsinc.gov FU DOE SBIR/STTR [DE-FG02-03ER83722, 04ER86191, 04ER84016, 05ER86252, 05ER86253, 06ER86282] FX Supported by DOE SBIR/STTR grants DE-FG02-03ER83722, 04ER86191, 04ER84016, 05ER86252, 05ER86253 and 06ER86282. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2547 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303046 ER PT B AU Bane, K Ding, Y Emma, P Frisch, J Huang, Z Loos, H Sannibale, F Sonnad, K Stupakov, G Wu, J Zolotorev, M Prat, E AF Bane, K. Ding, Y. Emma, P. Frisch, J. Huang, Z. Loos, H. Sannibale, F. Sonnad, K. Stupakov, G. Wu, J. Zolotorev, M. Prat, E. GP IEEE TI Measurements of compression and emittance growth after the first LCLS bunch compressor chicane SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The Linac Coherent Light Source (LCLS) is a SASE x-ray free-electron laser project presently under construction at SLAC [1]. The injector section from RF photocathode gun through first bunch compressor chicane was installed during the fall of 2006. The first bunch compressor is located at 250 MeV and nominally compresses a 1-nC electron bunch from an rms length of about 1 mm to 0.2 mm. Transverse phase space and bunch length diagnostics are located immediately after the chicane. We present preliminary measurements and simulations of the longitudinal and transverse phase space after the chicane in various beam conditions, including extreme compression with micron-scale current spikes. C1 [Bane, K.; Ding, Y.; Emma, P.; Frisch, J.; Huang, Z.; Loos, H.; Sannibale, F.; Sonnad, K.; Stupakov, G.; Wu, J.; Zolotorev, M.] Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. [Prat, E.] DESY, Hamburg, Germany. RP Bane, K (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. EM Emma@SLAC.Stanford.edu FU US DOE [DE-AC02-76SF00515] FX Work supported by US DOE contract DE-AC02-76SF00515. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2553 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303048 ER PT B AU Galambos, J Aleksandrov, A Allen, CK Henderson, S Shishlo, A Pelaia, T Zhang, Y Chu, CP AF Galambos, J. Aleksandrov, A. Allen, C. K. Henderson, S. Shishlo, A. Pelaia, T. Zhang, Y. Chu, C. P. GP IEEE TI Software tools for commissioning of the Spallation Neutron Source Linac SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The Accelerator Physics group at the Spallation Neutron Source (SNS) has developed numerous codes to assist in the beam commissioning, tuning, and operation of the SNS Linac. These codes have been key to meeting the beam commissioning milestones. For example, a recently developed code provides for rapid retuning of the superconducting Linac in case of RF stations going offline or coming online. Highlights of these "physics applications" are presented. C1 [Galambos, J.; Aleksandrov, A.; Allen, C. K.; Henderson, S.; Shishlo, A.; Pelaia, T.; Zhang, Y.] ORNL, Oak Ridge, TN 37831 USA. [Chu, C. P.] SLAC, Menlo Pk, CA 94025 USA. RP Galambos, J (reprint author), ORNL, Oak Ridge, TN 37831 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2556 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303049 ER PT B AU Cameron, P Cupolo, J Dawson, WC Degen, C DellaPenna, A Hoff, LT Luo, Y Marusic, A Schroeder, R Schultheiss, C Tepikian, S AF Cameron, P. Cupolo, J. Dawson, W. C. Degen, C. DellaPenna, A. Hoff, L. T. Luo, Y. Marusic, A. Schroeder, R. Schultheiss, C. Tepikian, S. GP IEEE TI Progress in tune, coupling, and chromaticity measurement and feedback during RHIC run 7 SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Tune feedback was first implemented in RHIC in 2002, as a specialist activity. The transition of the tune feedback system to full operational status was impeded by dynamic range problems, as well as by overall loop instabilities driven by large coupling. The dynamic range problem was solved by the CERN development of the Direct Diode Detection Analog Front End [1]. Continuous measurement of all projections of the betatron eigenmodes made possible the world's first implementation of coupling feedback during beam acceleration [2,3], resolving the problem of overall loop instabilites. Simultaneous tune and coupling feedbacks were utilized as specialist activities for ramp development during the 2006 RHIC run. At the beginning of the 2007 RHIC run there remained two obstacles to making these feedbacks fully operational in RHIC - chromaticity measurement and control, and the presence of strong harmonics of the power line frequency in the betatron spectrum [4]. We report on progress in tune, coupling, and chromaticity measurement and feedback, and discuss the relevance of our results to LHC commissioning. C1 [Cameron, P.; Cupolo, J.; Dawson, W. C.; Degen, C.; DellaPenna, A.; Hoff, L. T.; Luo, Y.; Marusic, A.; Schroeder, R.; Schultheiss, C.; Tepikian, S.] Brookhaven Natl Lab, Upton, NY 11973 USA. RP Cameron, P (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2559 EP 2561 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303050 ER PT B AU Moore, RS AF Moore, R. S. GP IEEE TI Review of recent tevatron operations SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Fermilab's Tevatron proton-antiproton collider continues to improve its luminosity performance at the energy frontier root s = 1.96 TeV The recent Tevatron operation will be reviewed and notable tasks leading to advancements will be highlighted. The topics to be covered include: work performed during the 14-week shutdown in 2006, improved helical orbits, automatic orbit stabilization during high-energy physics (HEP) stores, optics corrections, improvements in the quench protection system, and avenues to maximizing the integrated luminosity delivered to the CDF and DO experiments. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Moore, RS (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM ronmoore@fnal.gov 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2562 EP 2564 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303051 ER PT B AU Valishev, A Alexahin, Y Lebedev, V Moore, RS Shiltsev, V AF Valishev, A. Alexahin, Yu. Lebedev, V. Moore, R. S. Shiltsev, V. GP IEEE TI Observations and modeling of beam-beam effects at the tevatron collider SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB This report summarizes recent experience with beam-beam effects at the Tevatron collider. Improvements in the beam lifetime resulting from the implementation of the a helical orbit are analyzed. The effect of second order chromaticity correction is studied. C1 [Valishev, A.; Alexahin, Yu.; Lebedev, V.; Moore, R. S.; Shiltsev, V.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Valishev, A (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM valishev@fnal.gov 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2568 EP 2570 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303053 ER PT B AU Shiltsev, V Alexahin, Y Kamerdzhiev, V Kuznetsov, G Zhang, XL Bishofberger, K AF Shiltsev, V. Alexahin, Y. Kamerdzhiev, V. Kuznetsov, G. Zhang, X. L. Bishofberger, K. GP IEEE TI Experimental demonstration of beam-beam compensation by tevatron electron lenses and prospects for the LHC SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Electromagnetic long-range and head-on interactions of high intensity proton and antiproton beams are significant sources of beam loss and lifetime limitations in the Tevatron Collider Run II (2001-present). We present observations of the beam-beam phenomena in the Tevatron and results of relevant beam studies. We analyze the data and various methods employed in high energy physics (HEP) operation, predict the performance for planned luminosity upgrades and discuss ways to improve it. C1 [Shiltsev, V.; Alexahin, Y.; Kamerdzhiev, V.; Kuznetsov, G.; Zhang, X. L.] Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. [Bishofberger, K.] LANL, Los Alamos, NM 87544 USA. RP Shiltsev, V (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM shiltsev@fnal.gov FU US DoE [DE-AC02-76CH03000] FX Work supported by Fermi Research Alliance Ltd. under Contract No.DE-AC02-76CH03000 with the US DoE. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2571 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303054 ER PT B AU Macek, RJ Browman, AA Ledford, JE Borden, MJ O'Hara, JF McCrady, RC Rybarcyk, LJ Spickermann, T Zaugg, TJ Pivi, MTF AF Macek, R. J. Browman, A. A. Ledford, J. E. Borden, M. J. O'Hara, J. F. McCrady, R. C. Rybarcyk, L. J. Spickermann, T. Zaugg, T. J. Pivi, M. T. F. GP IEEE TI Electron cloud generation and trapping in a quadrupole magnet at the Los Alamos PSR SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB A diagnostic to measure electron cloud formation and trapping in a quadrupole magnet has been developed, installed, and successfully tested at PSR. Beam studies with this diagnostic show that the electron flux striking the wall in the quadrupole is comparable to or larger than in an adjacent drift. In addition, the trapped electron signal, obtained using the sweeping feature of diagnostic, was larger than expected and decayed very slowly with an exponential time constant of 50 to 100 mu s. Experimental results were also obtained which suggest that a significant fraction of the electrons observed in the adjacent drift space were seeded by electrons ejected from the quadrupole. C1 [Macek, R. J.; Borden, M. J.; O'Hara, J. F.; McCrady, R. C.; Rybarcyk, L. J.; Spickermann, T.; Zaugg, T. J.] TechSource Inc, Santa Fe, NM 87505 USA. [Macek, R. J.; Browman, A. A.; Ledford, J. E.] Los Alamos Natl Lab, Los Alamos, NM 87545 USA. [Pivi, M. T. F.] Stanford Linear Accelerator Ctr, Menlo Pk, CA 94025 USA. RP Macek, RJ (reprint author), TechSource Inc, Santa Fe, NM 87505 USA. EM macek@lanl.gov FU DOE [DE-FG02-04ER84105]; CRADA [LA05C10535]; Los Alamos National Laboratory; US Department of Energy [DE-AC52-06NA25396] FX Work supported by DOE SBIR Grant No. DE-FG02-04ER84105 and CRADA No. LA05C10535 between TechSource, Inc. and the Los Alamos National Laboratory. LANL is supported by the US Department of Energy under Contract Number DE-AC52-06NA25396. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2579 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303056 ER PT B AU Stern, E Amundson, J Spentzouris, P Valishev, A Qiang, J Ryne, R AF Stern, E. Amundson, J. Spentzouris, P. Valishev, A. Qiang, J. Ryne, R. GP IEEE TI Development of 3D beam-beam simulation for the tevatron SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB We present status of development of a 3D Beam-Beam simulation code for simulating the Fermilab Tevatron collider. The essential features of the code are 3D particle-in-cell Poisson solver for calculating the Beam-Beam electromagnetic interactions with additional modules for linear optics, machine impedance and chromaticity, and multiple bunch tracking. The simulations match synchrobetatron oscillations measured at the VEPP-2M collider. The impedance calculations show beam instability development consistent with analytic expressions. C1 [Stern, E.; Amundson, J.; Spentzouris, P.; Valishev, A.] Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. [Qiang, J.; Ryne, R.] LBNL, Berkeley, CA 94720 USA. RP Stern, E (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. FU U.S. Department of Energy FX work supported by the SciDAC program of the U.S. Department of Energy. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2583 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303058 ER PT B AU Candel, A Kabel, A Lee, L Li, Z Limborg, C Ng, C Prudencio, E Schussman, G Uplenchwar, R Ko, K AF Candel, A. Kabel, A. Lee, L. Li, Z. Limborg, C. Ng, C. Prudencio, E. Schussman, G. Uplenchwar, R. Ko, K. GP IEEE TI Parallel finite element particle-in-cell code for simulations of space-charge dominated beam-cavity interactions SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Over the past years, SLAC's Advanced Computations Department (ACD) has developed the parallel finite element (FE) particle-in-cell code Pic3P (Pic2P) for simulations of beam-cavity interactions dominated by space-charge effects. As opposed to standard space-charge dominated beam transport codes, which are based on the electrostatic approximation, Pic3P (Pic2P) includes space-charge, retardation and boundary effects as it self-consistently solves the complete set of Maxwell-Lorentz equations using higher-order FE methods on conformal meshes. Use of efficient, large-scale parallel processing allows for the modeling of photoinjectors with unprecedented accuracy, aiding the design and operation of the next-generation of accelerator facilities. Applications to the Linac Coherent Light Source (LCLS) RF gun are presented. C1 [Candel, A.; Kabel, A.; Lee, L.; Li, Z.; Limborg, C.; Ng, C.; Prudencio, E.; Schussman, G.; Uplenchwar, R.; Ko, K.] SLAC, Menlo Pk, CA 94025 USA. RP Candel, A (reprint author), SLAC, Menlo Pk, CA 94025 USA. EM candel@slac.stanford.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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2586 EP 2588 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303059 ER PT B AU Seiya, K Berenc, T Chase, B Dey, J Joireman, P Kourbanis, I Reid, J AF Seiya, K. Berenc, T. Chase, B. Dey, J. Joireman, P. Kourbanis, I. Reid, J. GP IEEE TI Multi-batch slip stacking in the main injector at fermilab SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The Main Injector (MI) at Fermilab is planning to use multi-batch slip stacking scheme in order to increase the proton intensity at the NuMI target by about a factor of 1.5.[1] [2] By using multi-batch slip stacking, a total of 11 Booster batches are merged into 6, 5 double ones and one single. We have successfully demonstrated the multibatch slip stacking in MI and accelerated a record intensity of 4.6E13 particle per cycle to 120 GeV. The technical issues and beam loss mechanisms for multibatch slip stacking scheme are discussed. C1 [Seiya, K.; Berenc, T.; Chase, B.; Dey, J.; Joireman, P.; Kourbanis, I.; Reid, J.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Seiya, K (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM kiyomi@fnal.gov 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2595 EP 2597 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303062 ER PT B AU Bai, M Ahrens, L Alekseev, IG Alessi, J Beebe-Wang, J Blaskiewicz, M Bravar, A Brennan, JM Brown, K Bruno, D Bunce, G Butler, J Cameron, P Connolly, R Delong, J D'Ottavio, T Drees, A Fischer, W Ganetis, G Gardner, C Glenn, J Hayes, T Hseuh, HC Huang, H Ingrassia, P Laster, J Lee, R Luccio, A Luo, Y MacKay, WW Makdisi, Y Marr, G Marusic, A McIntyre, G Michnoff, R Montag, C Morris, J Oddo, P Oerter, B Piacentino, J Pilat, F Ptitsyn, V Roser, T Satogata, T Smith, K Svirida, DN Trbojevic, D Tsoupas, N Tnozzolo, J Wilinski, M Tepikian, S Zaltsman, A Zelenski, A Zeno, K Zhang, SY AF Bai, M. Ahrens, L. Alekseev, I. G. Alessi, J. Beebe-Wang, J. Blaskiewicz, M. Bravar, A. Brennan, J. M. Brown, K. Bruno, D. Bunce, G. Butler, J. Cameron, P. Connolly, R. Delong, J. D'Ottavio, T. Drees, A. Fischer, W. Ganetis, G. Gardner, C. Glenn, J. Hayes, T. Hseuh, H-C. Huang, H. Ingrassia, P. Laster, J. Lee, R. Luccio, A. Luo, Y. MacKay, W. W. Makdisi, Y. Marr, G. Marusic, A. McIntyre, G. Michnoff, R. Montag, C. Morris, J. Oddo, P. Oerter, B. Piacentino, J. Pilat, F. Ptitsyn, V. Roser, T. Satogata, T. Smith, K. Svirida, D. N. Trbojevic, D. Tsoupas, N. Tnozzolo, J. Wilinski, M. Tepikian, S. Zaltsman, A. Zelenski, A. Zeno, K. Zhang, S. Y. GP IEEE TI Accelerating polarized protons to 250 GeV SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE ID RESONANCES AB The Relativistic Heavy Ion Collider (RHIC) as the first high energy polarized proton collider was designed to provide polarized proton collisions at a maximum beam energy of 250 GeV. It has been providing collisions at a beam energy of 100 GeV since 2001. Equipped with two full Siberian snakes in each ring, polarization is preserved during the acceleration from injection to 100 GeV with careful control of the betatron tunes and the vertical orbit distortions. However, the intrinsic spin resonances beyond 100 GeV are about a factor of two stronger than those below 100 GeV making it important to examine the impact of these strong intrinsic spin resonances on polarization survival and the tolerance for vertical orbit distortions. Polarized protons were accelerated to the record energy of 250 GeV in RHIC with a polarization of 46% measured at top energy in 2006. The polarization measurement as a function of beam energy also shows some polarization loss around 136 GeV, the first strong intrinsic resonance above 100 GeV. This paper presents the results and discusses the sensitivity of the polarization survival to orbit distortions. C1 [Bai, M.; Ahrens, L.; Alekseev, I. G.; Alessi, J.; Beebe-Wang, J.; Blaskiewicz, M.; Bravar, A.; Brennan, J. M.; Brown, K.; Bruno, D.; Bunce, G.; Butler, J.; Cameron, P.; Connolly, R.; Delong, J.; D'Ottavio, T.; Drees, A.; Fischer, W.; Ganetis, G.; Gardner, C.; Glenn, J.; Hayes, T.; Hseuh, H-C.; Huang, H.; Ingrassia, P.; Laster, J.; Lee, R.; Luccio, A.; Luo, Y.; MacKay, W. W.; Makdisi, Y.; Marr, G.; Marusic, A.; McIntyre, G.; Michnoff, R.; Montag, C.; Morris, J.; Oddo, P.; Oerter, B.; Piacentino, J.; Pilat, F.; Ptitsyn, V.; Roser, T.; Satogata, T.; Smith, K.; Svirida, D. N.; Trbojevic, D.; Tsoupas, N.; Tnozzolo, J.; Wilinski, M.; Tepikian, S.; Zaltsman, A.; Zelenski, A.; Zeno, K.; Zhang, S. Y.] Brookhaven Natl Lab, Upton, NY 11973 USA. RP Bai, M (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. RI Alekseev, Igor/J-8070-2014; Svirida, Dmitry/R-4909-2016 OI Alekseev, Igor/0000-0003-3358-9635; 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2598 EP 2600 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303063 ER PT B AU Huang, H Ahrens, L Bai, M Brown, KA Gardner, C Glenn, JW Lin, F Luccio, AU MacKay, WW Roser, T Tepikian, S Tsoupas, N Yip, K Zeno, K AF Huang, H. Ahrens, L. Bai, M. Brown, K. A. Gardner, C. Glenn, J. W. Lin, F. Luccio, A. U. MacKay, W. W. Roser, T. Tepikian, S. Tsoupas, N. Yip, K. Zeno, K. GP IEEE TI Overcoming depolarizing resonances in the AGS with two helical partial Siberian snakes SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Dual partial snake scheme has provided polarized proton beams with 1.5 x 10(11) intensity and 65% polarization for the Relativistic Heavy Ion Collider (RHIC) spin program. To overcome the residual polarization loss due to horizontal resonances in the Brookhaven Alternating Gradient Synchrotron (AGS), a new string of quadrupoles have been added. The horizontal tune can then be set in the spin tune gap generated by the two partial snakes, such that horizontal resonances can also be avoided. This paper presents the accelerator setup and preliminary results. C1 [Huang, H.; Ahrens, L.; Bai, M.; Brown, K. A.; Gardner, C.; Glenn, J. W.; Lin, F.; Luccio, A. U.; MacKay, W. W.; Roser, T.; Tepikian, S.; Tsoupas, N.; Yip, K.; Zeno, K.] Brookhaven Natl Lab, Upton, NY 11973 USA. RP Huang, H (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. EM huanghai@bnl.gov RI Yip, Kin/D-6860-2013 OI Yip, Kin/0000-0002-8576-4311 NR 9 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2601 EP 2603 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303064 ER PT B AU Koscielniak, SR Johnstone, C AF Koscielniak, S. R. Johnstone, Carol GP IEEE TI Analytic model for quadrupole fringe-field effects SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE ID ORDER TRANSFER MATRICES AB The linear-field non-scaling FFAG lattices originally proposed for multi-GeV muon acceleration are now being modified for similar or equal to 200 MeV/u proton or carbon medical applications. The momentum range is large and the chromatic tune variation is significant. In the medical case, the issue of resonance crossing is acute owing to the lower rate of energy gain. Quadrupole magnets with non-normal entry/exit faces are considered as means to reduce the tune variation. Thus one is motivated to study the fringe-field effects of quadrupole magnets with rotated entry/exit faces. However, just as a bending (dipole) magnet fringe-field B-f proportional to re(i theta) is found to give a focusing effect, so we expect the fringe field of a quadrupole magnet, B-f proportional to r(2)e(i2 theta), with rotated pole faces to give amplitude-dependent impulses reminiscent of a sextapole magnet. This note is a precis of two laboratory reports [11, 12]. C1 [Koscielniak, S. R.] TRIUMF, 4004 Wesbrook Mall, Vancouver, BC V6T 2A3, Canada. [Johnstone, Carol] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Koscielniak, SR (reprint author), TRIUMF, 4004 Wesbrook Mall, Vancouver, BC V6T 2A3, Canada. FU National Research Council of Canada; Universities Research Association Inc. FX TRIUMF receives federal funding via a contribution agreement through the National Research Council of Canada.; Work supported by Universities Research Association Inc. NR 12 TC 0 Z9 0 U1 1 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2607 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303066 ER PT B AU Bayer, W Barth, W Dahl, L Forck, P Gerhard, P Groening, L Hofmann, I Yaramyshev, S Jeon, D AF Bayer, W. Barth, W. Dahl, L. Forck, P. Gerhard, P. Groening, L. Hofmann, I. Yaramyshev, S. Jeon, D. GP IEEE TI High intensity heavy ion beam emittance measurements at the GSI UNILAC SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The GSI UNILAC, a heavy ion linac originally dedicated for low cut-rent beam operation, together with the synchrotron SIS 18 will serve as a high current injector for FAIR (International Facility for Antiproton and Ion Research). The UNILAC post stripper accelerator consists of five Alvarez tanks with a final energy of 11.4 MeV/u. In order to meet the requirements of FAIR (15emA U-238(28+) transverse normalised emittances of 0.8 in mrad and 2.5 mm mrad an UNILAC upgrade pro gram is foreseen to increase the primary beam intensity as well as the beam brilliance. A detailed Understanding of the beam dynamics during acceleration and the transport of space charge dominated beams is necessary, For this purpose the beam brilliance dependency oil the phase advances in the Alvarez DTL was Studied. Machine investigations were performed with various beam diagnostics devices established in the UNILAC. Measurements done in 2006 using a high intensity heavy ion beam coincide with the beam dynamics work package of the European JRA "High Intensity Pulsed Proton Injector" (HIPPI). Results of these measurements are presented as well as corresponding beam dynamics simulations. C1 [Bayer, W.; Barth, W.; Dahl, L.; Forck, P.; Gerhard, P.; Groening, L.; Hofmann, I.; Yaramyshev, S.] GSI Darmstadt, D-64291 Darmstadt, Germany. [Jeon, D.] Oak Ridge Natl Lab, Oak Ridge, TN 37830 USA. RP Bayer, W (reprint author), GSI Darmstadt, D-64291 Darmstadt, Germany. EM w.bayer@gsi.de FU European Community-Research Infrastructure Activity (CARE) [RII3-CT-2003-506395] FX We acknowledge the support of the European Community-Research Infrastructure Activity under the FP6 Structuring the European Research Area programme (CARE,contract number RII3-CT-2003-506395). NR 9 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2634 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303075 ER PT B AU Schempp, A Ratzinger, U Tiede, R Zhang, C Alessi, J Raparia, D Snydstrup, L AF Schempp, A. Ratzinger, U. Tiede, R. Zhang, C. Alessi, J. Raparia, D. Snydstrup, L. GP IEEE TI RFQ and IH accelerators for the new EBIS injector at BNL SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The new EBIS preinjector at BNL will accelerate ions from the EBIS source with specific mass to charge ratio of up to 6.25, from 17 keV/u to 2000 keV/u to inject into the Booster synchrotron, expanding experimental possibilities for RHIC and NASA experiments. The properties of the RFQ and IH accelerators and the status of the project will be discussed. C1 [Schempp, A.; Ratzinger, U.; Tiede, R.; Zhang, C.] Goethe Univ Frankfurt, IAP, D-6000 Frankfurt, Germany. [Alessi, J.; Raparia, D.; Snydstrup, L.] BNL, Upton, NY USA. RP Schempp, A (reprint author), Goethe Univ Frankfurt, IAP, D-6000 Frankfurt, Germany. RI Zhang, Chuan/B-9387-2009 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2660 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303084 ER PT B AU Cai, Y Ecklund, S Fisher, A Heifets, S Novokhatski, A Pivi, M Seeman, J Seryi, A Sullivan, M Wienands, U Biagini, M Guiducci, S Raimondi, P Koop, I Shatilov, D Zobov, M AF Cai, Y. Ecklund, S. Fisher, A. Heifets, S. Novokhatski, A. Pivi, M. Seeman, J. Seryi, A. Sullivan, M. Wienands, U. Biagini, M. Guiducci, S. Raimondi, P. Koop, I. Shatilov, D. Zobov, M. GP IEEE TI Super-B factory using low emittance storage rings and large crossing angle SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Parameters are being studied for a high luminosity e+e-collider operating at the Upsilon 4S that would deliver a luminosity of over 10(36)/cm(2)/s. This collider, called a Super-B Factory, would use a novel combination of linear collider and storage ring techniques. In this scheme an electron beam and a positron beam are stored in low-emittance damping rings similar to those designed for a Linear Collider (LC). A LC style interaction region is included in the ring to produce sub-millimeter vertical beta functions at the collision point. A large crossing angle (+/- 17 mrad) is used at the collision point to allow beam separation and reduce the hourglass effects. Beam currents of about 2.3 A x 1.3 A at 4 x 7 GeV in 1733 bunches can produce a luminosity Of 10(36)/cm(2)/s. Such a collider would produce an integrated luminosity of about 10,000 fb(-1) (10 ab(-1)) in a running year (107 see) at the Y(4S) resonance. C1 [Cai, Y.; Ecklund, S.; Fisher, A.; Heifets, S.; Novokhatski, A.; Pivi, M.; Seeman, J.; Seryi, A.; Sullivan, M.; Wienands, U.] SLAC, 2575 Sand Hill Rd, Menlo Pk, CA 94025 USA. [Biagini, M.; Guiducci, S.; Raimondi, P.] Ist Nazl Fis Nucl, LNF, Frascati, Italy. [Koop, I.; Shatilov, D.; Zobov, M.] Budker Inst, Novosibirsk, Russia. RP Cai, Y (reprint author), SLAC, 2575 Sand Hill Rd, Menlo Pk, CA 94025 USA. EM seeman@slac.stanford.edu FU US DOE [DE-AC02-76SF00515] FX Supported by US DOE contract DE-AC02-76SF00515. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2681 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303091 ER PT B AU Ohnishi, Y Biagini, ME Cai, Y Raimondi, P Seeman, J Sullivan, MK Wienands, U Wolski, A AF Ohnishi, Y. Biagini, M. E. Cai, Y. Raimondi, P. Seeman, J. Sullivan, M. K. Wienands, U. Wolski, A. GP IEEE TI Low emittance lattice and final focus design for a SuperB project SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Very low emittances and small beta fimctions at the interaction point(IP) are needed to achieve the design luminosity of 10(36) cm(-2) s(-1) for a SuperB project. Two rings of 4 and 7 GeV have been designed with the same emittances and damping times. A new Final Focus section has also been designed to strongly squeeze the colliding beams both in the horizontal and the vertical plane at IP, while providing local correction of the large chromaticity and exploiting the large crossing angle and crab waist concepts. Lattice features and chromaticity correction schemes will be discussed here. Dynamic apertures, with damping wigglers similar to those of ILC, will also be presented. C1 [Ohnishi, Y.] KEK, Ibaraki, Japan. [Biagini, M. E.; Raimondi, P.] INFN LNF, Rome, Italy. [Wolski, A.] Univ Liverpool, Liverpool L69 3BX, Merseyside, England. [Cai, Y.; Seeman, J.; Sullivan, M. K.; Wienands, U.] SLAC, Menlo Pk, CA 94025 USA. RP Ohnishi, Y (reprint author), KEK, Ibaraki, Japan. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2720 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303104 ER PT B AU Dorda, U Zimmermann, F Fischer, W Shiltsev, V AF Dorda, Ulrich Zimmermann, Frank Fischer, Wolfram Shiltsev, Vladimir GP IEEE TI LHC beam-beam compensation using wires and electron lenses SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB We present weak-strong simulation results for a possible application of current-carrying wires and electron lenses to compensate the LHC long-range and head-on beam-beam interaction, respectively, for nominal and PACMAN bunches. We show that these measures have the potential to considerably increase the beam-beam limit, allowing for a corresponding increase in peak luminosity. C1 [Dorda, Ulrich; Zimmermann, Frank] CERN, Geneva, Switzerland. [Fischer, Wolfram] Brookhaven Natl Lab, Upton, NY 11973 USA. [Shiltsev, Vladimir] Fermilab Natl Accelerator Lab, Batavia, IL USA. RP Dorda, U (reprint author), CERN, Geneva, Switzerland. NR 6 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2810 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303134 ER PT B AU Aiba, M Carli, C Gerigk, F Martini, M Cousineau, S AF Aiba, M. Carli, C. Gerigk, F. Martini, M. Cousineau, S. GP IEEE TI Simulation of the CERN PS booster performance with 160 MeV H- injection from Linac4 SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The ultimate luminosity (2.3 x 10(34) cm(-2) s(-1)) in the LHC can only be reached or even exceeded if a major upgrade of the CERN proton injector complex takes place. The first identified bottleneck towards higher brightness beams is the 50 MeV proton injection of Linac2 into the PS booster (PSB). Doubling the intensity in the PSB can be achieved with a new linac (Linac4), which increases the injection energy to 160 MeV. Linac4 will provide H (-) ions and use charge-exchange injection into the PSB instead of the present multi-turn injection. We present the current status of simulations with ACCSIM, ORBIT, and ESME for all three planes. We use different initial distributions, corn pare the results of ACCSIM and ORBIT and highlight their differences. C1 [Aiba, M.; Carli, C.; Gerigk, F.] CERN, Geneva, Switzerland. [Cousineau, S.] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Aiba, M (reprint author), CERN, Geneva, Switzerland. FU ACCSIM; ORBIT; SNS FX We highly appreciate the active support of the ACCSIM and ORBIT authors and the SNS team, in particular we thank F. Jones, A. Shishlo, J. Holmes, and J. Galambos. At CERN H. Schonauer, M. Chanel, and A. Franchi have given us valuable advice. For the longitudinal studies we thank R. Garoby for his ideas and support. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2816 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303136 ER PT B AU Kondrashev, SA Barcikowski, A Mustapha, B Ostroumov, PN Scott, RH Sharamentov, SI Vinogradov, NV AF Kondrashev, S. A. Barcikowski, A. Mustapha, B. Ostroumov, P. N. Scott, R. H. Sharamentov, S. I. Vinogradov, N. V. GP IEEE TI Expereniental results on multi-charge-state LEBT approach SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE ID ION-SOURCE AB A multi-charge-state injector for a high-intensity heavy-ion linac is being developed at ANL. The injector consists of an all-permanent magnet ECR ion source [1], a 100 kV platform and a Low Energy Beam Transport (LEBT). The latter comprises two 60-degree bending magnets, electrostatic triplets and beam diagnostics stations. At present the injector system allows us to accelerate all ion species up to qx100 keV total kinetic energy, where q is the charge state of an ion. In the current installation, the accelerating tube is followed by a 90 degrees magnet and a beam measurement station [2]. Recently we studied the production of metal ion beams using an oven technique and high intensity light ion beams from the ECR ion. A pepper pot emittance meter based on a scintillator screen has been developed and tested with various CW ion beams. It was found that a CsI (Tl) crystal has a high sensitivity for a variety of ion species from protons to heavy ions with the current densities even below 1 mu A/cm(2). C1 [Kondrashev, S. A.; Barcikowski, A.; Mustapha, B.; Ostroumov, P. N.; Scott, R. H.; Sharamentov, S. I.] Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. [Vinogradov, N. V.] No Illinois Univ, De Kalb, IL 60115 USA. RP Kondrashev, SA (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. EM kondrashev@anl.gov FU U.S. Department of Energy, Office of Nuclear Physics [DE-AC-02-6CH11357] FX Work supported by the U.S. Department of Energy, Office of Nuclear Physics, under Contract No. DE-AC-02-6CH11357.kondrashev@anl.gov 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2879 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303157 ER PT B AU Mustapha, B Ostrournov, PN Nolen, JA AF Mustapha, B. Ostrournov, P. N. Nolen, J. A. GP IEEE TI A driver linac for the advanced exotic beam laboratory: Physics design and beam dynamics simulations SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The Advanced Exotic Beam Laboratory (AEBL) being developed at ANL consists of an 833 MV heavy-ion driver linac capable of producing uranium ions up to 200 MeV/u and protons to 580 MeV with 400 kW beam power. We have designed all accelerator components including a two charge state LEBT, an RFQ, a MEBT, a superconducting linac, a stripper station and chicane. We present the results of an optimized linac design and end-to-end simulations including machine errors and detailed beam loss analysis. C1 [Mustapha, B.; Ostrournov, P. N.; Nolen, J. A.] Argonne Natl Lab, Argonne, IL 60439 USA. RP Mustapha, B (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. EM mustapha@phy.anl.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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2882 EP 2884 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303158 ER PT B AU Ostroumov, PN Fuerst, JD Kelly, MP Mustapha, B Nolen, JA Shepard, KW AF Ostroumov, P. N. Fuerst, J. D. Kelly, M. P. Mustapha, B. Nolen, J. A. Shepard, K. W. GP IEEE TI Accelerators for the advanced exotic beam facility in the U.S SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The Office of Science of the Department of Energy is currently considering options for an advanced radioactive beam facility in the U.S which is a reduced scale version of the Rare Isotope Accelerator (RIA) project [1,2]. This facility will have unique capabilities compared with others both existing and planned elsewhere. As envisioned at ANL, the facility, called the Advanced Exotic Beam Laboratory (AEBL), would consist of a heavy-ion driver linac, a post-accelerator and experimental areas. Secondary beams of rare isotopes will be available as high quality reaccelerated or stopped beams from a gas catcher and high power ISOL targets, as well as, high energy beams following in-flight fragmentation or fission of heavy ions. The proposed design of the AEBL driver linac is a cw, fully superconducting, 833 MV linac capable of accelerating uranium ions up to 200 MeV/u and protons to 580 MeV with 400 kW beam power. An extensive research and development effort has resolved many technical issues related to the construction of the driver linac and other systems required for AEBL. This paper presents the status of planning, some options for such a facility, as well as, progress in related R&D. C1 [Ostroumov, P. N.; Fuerst, J. D.; Kelly, M. P.; Mustapha, B.; Nolen, J. A.; Shepard, K. W.] Argonne Natl Lab, Argonne, IL 60439 USA. RP Ostroumov, PN (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. EM ostroumov@phy.anl.gov 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2885 EP 2887 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303159 ER PT B AU Wang, S Brurnwell, FR Dooling, JC Kustom, R McMichael, G Middendorf, ME AF Wang, S. Brurnwell, F. R. Dooling, J. C. Kustom, R. McMichael, G. Middendorf, M. E. GP IEEE TI The investigation of injection timing for the IPNS RCS SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Th Rapid Cycling Synchrotron (RCS) of the Intense Pulsed Neutron Source (IPNS) at ANL accelerates > 3.0 x 10(12) protons from 50 MeV to 450 MeV with 30-Hz repetition frequency. During each acceleration cycle, the rf frequency varies from 2.21 MHz to 5.14 MHz. In order to improve capture efficiency, we varied the injection timing and the early rf voltage profiles. The experimental results are compared with simulation results obtained with the 1-D tracking code, CAPTURE. This allowed us to optimize injection time and the rf voltage profile for better capture efficiency. An optimized injection time and rf voltage profile was found that resulted in raising the capture efficiency from 85.1% to 88.6%. These studies have now also been expanded to include second harmonic rf during the capture and initial acceleration cycle in the RCS. C1 [Wang, S.; Brurnwell, F. R.; Dooling, J. C.; Kustom, R.; McMichael, G.; Middendorf, M. E.] Argonne Natl Lab, Argonne, IL 60439 USA. RP Wang, S (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. EM wangshaoheng@anl.gov 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2888 EP 2890 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303160 ER PT B AU Brown, BC Adamson, P Capista, D Johnson, DE Kourbanis, L Morris, DK Yang, MJ AF Brown, Bruce C. Adamson, Philip Capista, David Johnson, David E. Kourbanis, Loanis Morris, Denton K. Yang, Ming-Jen GP IEEE TI Studies of beam properties and main injector loss control using colleniators in the Fermilab Booster to Main Injector transfer line SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB High intensity operation of the Fermilab Main Injector has resulted in increased activation of machine components. Efforts to permit operation at high power include creation of collimation systems to localize losses away from locations which require maintenance. As a first step, a collimation system to remove halo from the incoming beam was installed in the Spring 2006 Facility Shutdown [1]. We report on commissioning studies and operational experience including observations of Booster beam properties, effects on Main Injector loss and activation, and operational results. C1 [Brown, Bruce C.; Adamson, Philip; Capista, David; Johnson, David E.; Kourbanis, Loanis; Morris, Denton K.; Yang, Ming-Jen] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Brown, BC (reprint author), Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. EM bcbrown@fnal.gov 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2891 EP 2893 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303161 ER PT B AU Brown, BC Capista, D Kourbanis, L Mokhov, NV Sidorov, V AF Brown, Bruce C. Capista, David Kourbanis, Loanis Mokhov, Nikolai V. Sidorov, Vladimir GP IEEE TI Collimation system for the Fermilab Booster to Main Injector transfer line SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB A collimation system has been created for removing proton beam halo in the 8 GeV transfer line from the Fermilab Booster to Main Injector. A pair of 1.14 meter long collimators with 5.08 cm rectangular apertures is installed in a 5-m straight section. Horizontal and vertical motion systems allow them to be positioned such that halo can be scraped from four sides. An additional pair of collimators, placed one cell (90 degrees) downstream, scrape halo which is of opposite phase. Each collimator pair can scrape about 600 Watts of beam power, limited by residual activation of beamline components and sump water outside of the beam line tunnel. Personnel exposure is reduced by surrounding the iron absorber with a layer of marble. Design features, radiation calculations and instrumentation considerations will be described. C1 [Brown, Bruce C.; Capista, David; Kourbanis, Loanis; Mokhov, Nikolai V.; Sidorov, Vladimir] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Brown, BC (reprint author), Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. EM bcbrown@fnal.gov 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2894 EP 2896 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303162 ER PT B AU Carneiro, JR Johnson, D Webber, RC AF Carneiro, J. -R Johnson, D. Webber, R. C. GP IEEE TI Start-to-end simulations for the proposed Fermilab high intensity proton source SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB A High Intensity Proton Source consisting in an 8 GeV superconducting H-minus linac and transfer line to the Main Injector has been proposed. The primary mission is to increase the intensity of the Fermilab Main Injector for the production of neutrino superbeams. Start-to-end simulations from the RFQ to the stripping foil using the simulation code TRACK (ANL) is presented in this paper. In particular, we will study the impact of jitter errors on the H-minus phase space at the stripping foil. C1 [Carneiro, J. -R; Johnson, D.; Webber, R. C.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Carneiro, JR (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM carneiro@fnal.gov; dej@fnal.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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2897 EP 2899 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303163 ER PT B AU Chou, W Lackey, J Tang, Z Yoon, P Kostin, M AF Chou, W. Lackey, J. Tang, Z. Yoon, P. Kostin, M. GP IEEE TI Some physics issues of carbon stripping foils SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE ID RELATIVISTIC H-IONS; THIN FOILS; CROSS-SECTIONS; HYDROGEN; TRANSMISSION; ATOMS; H-0 AB Carbon foils are widely used in charge-exchange injection in high intensity hadron accelerators. There are a number of physics issues associated with the use of carbon foils, including stripping efficiency, energy deposition and foil lifetime (temperature rise, mechanical stress and buckling, etc.). This paper will give a brief discussion of these issues. C1 [Chou, W.; Lackey, J.; Tang, Z.; Yoon, P.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. [Kostin, M.] NSCL, E Lansing, MI 48824 USA. RP Chou, W (reprint author), Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. EM chou@fnal.gov FU U.S. Department of Energy [DE-AC02-07CH11359] FX Work supported by the U.S. Department of Energy under Contract No. DE-AC02-07CH11359 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2900 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303164 ER PT B AU Chou, W Capista, D Griffin, J Ng, KY Wildman, D AF Chou, W. Capista, D. Griffin, J. Ng, K-Y. Wildman, D. GP IEEE TI Fast beam stacking using RF barriers SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Two barrier RF systems were fabricated, tested and installed in the Fermilab Main Injector. Each can provide 8 kV rectangular pulses (the RF barriers) at 90 kHz. When a stationary barrier is combined with a moving barrier, injected beams from the Booster can be continuously deflected, folded and stacked in the Main Injector, which leads to doubling of the beam intensity. This paper gives a report on the beam experiment using this novel technology. C1 [Chou, W.; Capista, D.; Griffin, J.; Ng, K-Y.; Wildman, D.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Chou, W (reprint author), Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. EM chou@fnal.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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2903 EP 2905 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303165 ER PT B AU Chou, W Bartelson, L Brown, B Capista, D Crisp, J DiMarco, J Fitzgerald, J Glass, H Harding, D Johnson, D Kashikbin, V Kourbanis, I Prieto, P Robotham, W Sager, T Tartaglia, M Valerio, L Webber, R Wendt, M Wolff, D Yang, M AF Chou, W. Bartelson, L. Brown, B. Capista, D. Crisp, J. DiMarco, J. Fitzgerald, J. Glass, H. Harding, D. Johnson, D. Kashikbin, V. Kourbanis, I. Prieto, P. Robotham, W. Sager, T. Tartaglia, M. Valerio, L. Webber, R. Wendt, M. Wolff, D. Yang, M. GP IEEE TI Operational aspects of the main injector large aperture quadrupole (WQB) SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB A two-year Large Aperture Quadrupole (WQB) Project was completed in the summer of 2006 at Fermilab. [1] Nine WQBs were designed, fabricated and bench-tested by the Technical Division. Seven of them were installed in the Main Injector and the other two for spares. They perform well. The aperture increase meets the design goal and the perturbation to the lattice is minimal. The machine acceptance in the injection and extraction regions is increased from 40 pi to 60 pi mm-mrad. This paper gives a brief report of the operation and performance of these magnets. Details can be found in Ref [2]. C1 [Chou, W.; Bartelson, L.; Brown, B.; Capista, D.; Crisp, J.; DiMarco, J.; Fitzgerald, J.; Glass, H.; Harding, D.; Johnson, D.; Kashikbin, V.; Kourbanis, I.; Prieto, P.; Robotham, W.; Sager, T.; Tartaglia, M.; Valerio, L.; Webber, R.; Wendt, M.; Wolff, D.; Yang, M.] Fermilab Natl Accelerator Lab, Batavia, IL USA. RP Chou, W (reprint author), Fermilab Natl Accelerator Lab, Batavia, IL USA. 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 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2906 EP 2908 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303166 ER PT B AU Drozhdin, AI Brown, BC Johnson, DE Koba, K Kourbanis, I Mokhov, NV Rakhno, IL Sidorov, VI AF Drozhdin, A. I. Brown, B. C. Johnson, D. E. Koba, K. Kourbanis, I. Mokhov, N. V. Rakhno, I. L. Sidorov, V. I. GP IEEE TI Collimation system design for beam loss localization with slipstacking injection in the Fermilab Main Injector SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Results of modeling with the 3-D STRUCT and MARS 15 codes of beam loss localization and related radiation effects are presented for the slipstacking injection to the Fermilab Main Injector. Simulations of proton beam loss are done using multi-turn tracking with realistic accelerator apertures, nonlinear fields in the accelerator magnets and time function of the RF manipulations to explain the results of beam loss measurements. The collimation system consists of one primary and four secondary collimators. It intercepts a beam power of 1.6 kW at a scraping rate of 5% of 5.5E+13 ppp, with a beam loss rate in the ring outside the collimation region of 1 W/m or less. Based on thorough energy deposition and radiation modeling, a corresponding collimator design was developed that satisfies all the radiation and engineering constraints. C1 [Drozhdin, A. I.; Brown, B. C.; Johnson, D. E.; Koba, K.; Kourbanis, I.; Mokhov, N. V.; Rakhno, I. L.; Sidorov, V. I.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Drozhdin, AI (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM drozhdin@fnal.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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2909 EP 2911 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303167 ER PT B AU Gelfand, NM AF Gelfand, Norman M. GP IEEE TI Tune drifts on the tevatron front porch SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB It has long been known that the tunes of the Tevatron drift on the 150GeV front porch. The drift is observed to have the same time dependence as the drift in the chromaticity. The variation in the chromaticity is due to the change in the b(2) of the superconducting dipoles, which represents the integrated sextupole moment of the magnet. it is reasonable to assume that the tune drift is due to the feed down from the changing b(2). Calculations based on this assumption, both here and in earlier attempts to explain the tune drift, show, absent unreasonable assumptions about the closed orbit, that the simple models of the variation of the sextupole moment will not explain the tune drift. An explanation, for both the tune drift, and the tune split observed when the Tevatron was first operated, is proposed. The suggestion is based on the longitudinal variation of the time varying sextupole component of the dipoles and the fact that the dipoles are not perfect sector magnets. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Gelfand, NM (reprint author), Fermilab Natl Accelerator Lab, Batavia, IL 60510 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2912 EP 2914 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303168 ER PT B AU Johnson, DE Yoon, P Liaw, CJ Raparia, D Beebe-Wang, J AF Johnson, D. E. Yoon, P. Liaw, C-J. Raparia, D. Beebe-Wang, J. GP IEEE TI An 8 GeV H- multi-turn injection system for the Fermilab Main Injector SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB An 8 GeV superconducting linear accelerator (SCL) has been proposed [1] as a single stage H- injector into the Main Injector (MI) synchrotron. This would be the highest energy H- multi-turn injection system in the world. The conceptual design of an injection system has been further refined by addressing transverse phase space painting issues, chicane dipole fields and foil location, foil temperature issues, and initial longitudinal phase space painting simulations. We present the current state of design. C1 [Johnson, D. E.; Yoon, P.] FNAL, Batavia, IL 60510 USA. [Liaw, C-J.; Raparia, D.; Beebe-Wang, J.] Brookhaven Natl Lab, Upton, NY 11973 USA. RP Johnson, DE (reprint author), FNAL, Batavia, IL 60510 USA. EM dej@fnal.gov FU Fermi Research Alliance, LLC [DE-AC027CH11359]; United States Department of Energ FX Operated by Fermi Research Alliance, LLC under contract No. DE-AC027CH11359 with the United States Department of Energ 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2921 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303171 ER PT B AU Kamerdzhiev, V Alexahin, Y Shiltsev, V Valishev, A Zhang, XL Shatilov, D AF Kamerdzhiev, V. Alexahin, Yu. Shiltsev, V. Valishev, A. Zhang, X. L. Shatilov, D. GP IEEE TI Experimiental and simulation studies of beam-beam compensation with Tevatron Electron lenses SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Initially the Tevatron Electron Lenses (TELs) were intended for compensation of the beam-beam effect on the antiproton beam [1]. Owing to recent increase in the number of antiprotons and reduction in their emittance, it is the proton beam now that suffers most from the beam-beam effect [2]. We present results of beam studies, compare them with the results of computer simulations using LIFETRAC code and discuss possibilities of further improvements of the Beam-Beam Compensation efficiency in the Tevatron. C1 [Kamerdzhiev, V.; Alexahin, Yu.; Shiltsev, V.; Valishev, A.; Zhang, X. L.] Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. [Shatilov, D.] Budker Inst Nucl Phys, SB RAS, Novosibirsk 630090, Russia. RP Kamerdzhiev, V (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM vsevolod@fnal.gov FU U.S. Department of Energy [DE-AC02-07CH11359] FX Work supported by the U.S. Department of Energy under contract No. DE-AC02-07CH11359 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2924 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303172 ER PT B AU Kamerdzhiev, V Fellenz, B Hively, R Kuznetsov, G Olson, M Pfeffer, H Saewert, G Scarpine, V Shiltsev, V Zhang, XL AF Kamerdzhiev, V. Fellenz, B. Hively, R. Kuznetsov, G. Olson, M. Pfeffer, H. Saewert, G. Scarpine, V. Shiltsev, V. Zhang, X. L. GP IEEE TI Commissioning of the second tevatron electron lens and beam study results SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB In the framework of Fermilab's Beam-Beam Compensation (BBC) project, the 2(nd) Tevatron Electron Lens (TEL2) was installed in the Tevatron during Spring 2006 shutdown. It was successfully commissioned and a series of beam studies has been carried out in single bunch and all-bunch modes. The paper describes TEL2 commissioning and beam studies results. C1 [Kamerdzhiev, V.; Fellenz, B.; Hively, R.; Kuznetsov, G.; Olson, M.; Pfeffer, H.; Saewert, G.; Scarpine, V.; Shiltsev, V.; Zhang, X. L.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Kamerdzhiev, V (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM vsevolod@fnal.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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2927 EP 2929 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303173 ER PT B AU Lackey, J Garcia, FG Poplovic, M Prebys, E AF Lackey, J. Garcia, F. G. Poplovic, M. Prebys, E. GP IEEE TI Operation and performance of the new Fermilab Booster H(-) injection system SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The operation and performance of the new, 15 Hz, H(-) charge exchange injection system for the FNAL Booster is described. The new system installed in 2006 was necessary to allow injection into the Booster at up to 15 Hz. It was built using radiation hardened materials which will allow the Booster to reliably meet the high intensity and repetition rate requirements of the Fermilab's BEP program. The new design uses three orbit bump magnets (Orbumps) rather than the usual four and permits injection into the Booster without a septum magnet. Injection beam line modification and compensation for the quadrupole gradients of the Orbump magnets is discussed. C1 [Lackey, J.; Garcia, F. G.; Poplovic, M.; Prebys, E.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Lackey, J (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM lackey@fnal.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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2930 EP 2932 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303174 ER PT B AU Martens, MA Childress, S Grossman, N Hurh, P Hylen, J Marchionni, A McCluskey, E Moore, CD Reilly, R Tariq, S Wehmann, A Williams, K Zwaska, RM AF Martens, Michael A. Childress, Sam Grossman, Nancy Hurh, Patrick Hylen, James Marchionni, Alberto McCluskey, Elaine Moore, Craig Damon Reilly, Robert Tariq, Salman Wehmann, Alan Williams, Karlton Zwaska, Robert Miles GP IEEE TI Upgrades to the Fermilab numi beamline SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The NuMI beamline at Fermilab has been delivering high-intensity muon neutrino beams to the MINOS experiment since the spring of 2005. A total of 3.4x10(20) protons has been delivered to the NuMI target and a maximum beam power of 320 kW has been achieved. An upgrade of the NuMI facility increasing the beam power capability to 700 kW is planned as part of the NOvA experiment. The plans for this upgrade are presented and the possibility of upgrading the NuMI bean-dine to handle 1.2 MW is considered. C1 [Martens, Michael A.; Childress, Sam; Grossman, Nancy; Hurh, Patrick; Hylen, James; Marchionni, Alberto; McCluskey, Elaine; Moore, Craig Damon; Reilly, Robert; Tariq, Salman; Wehmann, Alan; Williams, Karlton; Zwaska, Robert Miles] Fermilab Natl Accelerator Lab, Batavia, IL USA. RP Martens, MA (reprint author), Fermilab Natl Accelerator Lab, Batavia, IL USA. EM martens@fnal.anl.gov 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2933 EP 2935 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303175 ER PT B AU Prost, LK Sherayakin, A AF Prost, L. K. Sherayakin, A. GP IEEE TI Electron cooling rates characterization at Fermilab's Recycler SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB A 0.1 A, 4.3 MeV DC electron beam is routinely used to cool 8 GeV antiprotons, in Fermilab's Recycler storage ring [1]. The primary function. of the electron cooler is to increase the longitudinal phase-space density of the antiprotons for storing and preparing high-density bunches for injection into the Tevatron. The longitudinal cooling rate is found to significantly depend on the transverse emittance of the antiproton beam. The paper presents the measured rates and compares them with calculations based on drag force data. C1 [Prost, L. K.; Sherayakin, A.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Prost, LK (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2936 EP 2938 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303176 ER PT B AU Sen, T Johnstone, J AF Sen, Tanaji Johnstone, John GP IEEE TI Analysis of optics designs for the LHC IR upgrade SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB We consider the different options proposed for the LHC IR upgrade. The two main categories: quadrupoles first (as in the baseline design) and dipoles-first have complementary strengths. We analyze the potential of the proposed designs by calculating important performance parameters. We also propose a local scheme for correcting the quadratic chromaticity. C1 [Sen, Tanaji; Johnstone, John] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Sen, T (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2939 EP 2941 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303177 ER PT B AU Sen, T Scarpine, V Thurman-Keup, R AF Sen, Tanaji Scarpine, Vic Thurman-Keup, Randy GP IEEE TI Prospects of diagnostics with optical diffraction radiation in hadron colliders SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Optical diffraction radiation has been observed and recently used to measure the beam size of electrons at KEK. This non-invasive technique also holds promise for imaging beams close to the interaction point in hadron colliders. In this paper we consider the feasibility of this technique for the Tevatron and the LHC. C1 [Sen, Tanaji; Scarpine, Vic; Thurman-Keup, Randy] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Sen, T (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2942 EP 2944 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303178 ER PT B AU De Maria, R Kroyer, T Shiltsev, V AF De Maria, R. Kroyer, T. Shiltsev, V. GP IEEE TI Field fluctuation and beam screen vibration measurements in the LHC magnets SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB We present experimental methods and results for the measurement of the magnetic field fluctuation and beam screen vibration in the LHC magnets. These noises can lead to an emittance growth in proton beams if they have spectral components at the betatron fines. Preliminary estimates of the effects are given. C1 [De Maria, R.; Kroyer, T.] CERN, Geneva, Switzerland. [Shiltsev, V.] Fermilab Natl Accelerator Lab, Batavia, IL USA. RP De Maria, R (reprint author), CERN, Geneva, Switzerland. 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 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2945 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303179 ER PT B AU Johnson, DE Xiao, M AF Johnson, D. E. Xiao, M. GP IEEE TI The conceptual design of a new transfer line from Booster to Recycler for the Fermilab proton plan phase 2 campaign SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Upon the termination of the Fermilab Collider program, the current Recycler anti-proton storage ring (RR) will be converted to a proton pre-injector for the Main Injector (MI) synchrotron. This is scheduled to increase the beam power for the 120 GeV Neutrino program to upwards of 700KW. A transport line that can provide direct injection from the Booster to the Recycler while preserving direct injection from the Booster into the Main Injector and the 8 GeV Booster Neutrino program will be discussed, and its concept design will be presented. C1 [Johnson, D. E.; Xiao, M.] Fermilab Natl Accelerator Lab, Batavia, IL USA. RP Johnson, DE (reprint author), Fermilab Natl Accelerator Lab, Batavia, IL USA. EM dej@fnal.gov 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2948 EP 2950 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303180 ER PT B AU Xiao, M Johnson, DE AF Xiao, M. Johnson, D. E. GP IEEE TI The concept design of a transfer line from the Recycler to the Main Injector for the Fermilab NOVA project SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Upon the termination of the Fermilab Collider program, the current Recycler anti-proton storage ring will be converted to a proton pre-injector for the Main Injector synchrotron. This is scheduled to increase the beam power for the 120 GeV Neutrino program to upwards of 700KW. Due to momentum aperture requirements, a Recycler to Main Injector transport line will be constructed wholly within a horizontal dispersion free region in the 30 straight section. The concept design will be presented in this paper. C1 [Xiao, M.; Johnson, D. E.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Xiao, M (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2951 EP 2953 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303181 ER PT B AU Yang, X Drozhdin, AI Pellico, W AF Yang, X. Drozhdin, A. I. Pellico, W. GP IEEE TI Momentum spread reduction at beam extraction from the Fermilab Booster at slipstacking injection to the Main Injector SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB In order to reduce the momentum spread of the beam at extraction from the Booster to the Main Injector with slip stacking injection, the bunch rotation at the end of the cycle is applied. However, the fast RF voltage reduction often causes beam loading issues to Booster RF cavities, and the reliability of extracted beam becomes a problem. An alternative solution is investigated - modulating the RF voltage with twice of the synchrotron frequency introduces bunch length oscillation, and the beam is extracted at the time when the bunch length reaches maximum and the momentum spread becomes minimal. C1 [Yang, X.; Drozhdin, A. I.; Pellico, W.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Yang, X (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM xyang@fnal.gov 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2954 EP 2956 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303182 ER PT B AU Yang, X Drozhdin, AI Pellico, W AF Yang, X. Drozhdin, A. I. Pellico, W. GP IEEE TI Injection parameters optimization for the Fermilab Booster SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The maximal capacitance for the Booster to deliver the 8-GeV beam to downstream accelerators is limited by the beam loss. Most of losses happen at injection due to space charge effect being the strongest at the injection energy. Optimizing the RF voltage ramp in the presence of the space charge effect to capture more beam and simultaneously keep small beam emittance has been numerically investigated using 3-D STRUCT [1] code. The results of simulations agree well with the measurements in the machine. Possibilities, such as beam painting and using the third RF harmonic at injection, for further reductions of beam loss in order to reach the maximum beam intensity delivered from Booster have been investigated. C1 [Yang, X.; Drozhdin, A. I.; Pellico, W.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Yang, X (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM xyang@fnal.gov 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2957 EP 2959 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303183 ER PT B AU Yang, X Drozhdin, AI Pellico, W AF Yang, X. Drozhdin, A. I. Pellico, W. GP IEEE TI Transition crossing simulation at the Fermilab Booster SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The demand in high intensity and low emittance of the beam extracted from the Booster requires a better control over the momentum spread growth and bunch length shortening at transition crossing, in order to prevent beam loss and coupled bunch instability. Since the transition crossing involves both longitudinal and transverse dynamics, the recently modified 3-D STRUCT [1] code provides an opportunity to numerically investigate the different transition crossing schemes in the machine environment, and apply the results of simulation to minimize the beam loss and emittance growth operationally. C1 [Yang, X.; Drozhdin, A. I.; Pellico, W.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Yang, X (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM xyang@fnal.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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2960 EP 2962 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303184 ER PT B AU Loew, T Abbott, S Galloway, M Leitner, D Lyneis, CM AF Loew, T. Abbott, Steve Galloway, M. Leitner, D. Lyneis, C. M. GP IEEE TI Design of a high temperature oven for an ECR source for the production of uranium ion beams SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB VENUS is the superconducting electron cyclotron resonance (ECR) ion source at the Lawrence Berkeley National Lab's 88-Inch Cyclotron. To generate neutral atoms for ionization, the source utilizes a resistively-heated high temperature oven that is located in a magnetic field of up to 4 Tesla and operates at temperatures up to about 2000 degrees C. However, temperatures between 2100-2300 degrees C are required to produce the desired 280e mu A of high charge state uranium ion beams, and increased thermal and structural effects, combined with elevated chemical reactivity significantly reduce the oven's ability to operate in this envelope. The oven has been redesigned with higher thermal efficiency, improved structural strength and chemically compatible species in order to produce the desired high intensity, high charge state uranium beams. Aspects of the engineering development are presented. C1 [Loew, T.; Abbott, Steve; Galloway, M.; Leitner, D.; Lyneis, C. M.] LBNL, Berkeley, CA 94720 USA. RP Loew, T (reprint author), LBNL, Berkeley, CA 94720 USA. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2963 EP 2965 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303185 ER PT B AU Vainionpaa, JH Gough, R Hoff, M Kwan, JW Ludewigt, BA Regis, MJ Wallig, JG Wells, R AF Vainionpaa, J. H. Gough, R. Hoff, M. Kwan, J. W. Ludewigt, B. A. Regis, M. J. Wallig, J. G. Wells, R. GP IEEE TI Microwave ion source and beam injection for an accelerator-driven neutron source SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB An over-dense microwave driven ion source capable of producing deuterium (or hydrogen) beams at 100-200 mA/cm(2) with an atomic fraction > 90% was designed as a part of an Accelerator Driven Neutron Source (ADNS). The ion source was tested with an electrostatic low energy beam transport section (LEBT) and measured emittance data was compared to PBGUNS simulations. In our design a 40 mA D(+) beam is produced from a 6 turn diameter aperture using a 60 kV extraction voltage. The LEBT section consists of 5 electrodes arranged to form 2 Einzel lenses that focus the beam into the RFQ entrance. To create the ECR condition, 2 induction coils are used to generate a similar to 875 Gauss magnetic field on axis inside the source chamber. To prevent HV breakdown in the LEBT, a magnetic field clamp is necessary to minimize the field in this region. The microwave power is matched to the plasma by an autotuner. A significant improvement in the atomic fracion of the beam was achieved by installing a boron nitride liner inside the ion source. C1 [Vainionpaa, J. H.; Gough, R.; Hoff, M.; Kwan, J. W.; Ludewigt, B. A.; Regis, M. J.; Wallig, J. G.; Wells, R.] LBNL, Berkeley, CA USA. RP Vainionpaa, JH (reprint author), LBNL, Berkeley, CA 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2966 EP 2968 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303186 ER PT B AU Baek, I Ronningen, RM Wu, X Zeller, AF Remec, I AF Baek, I. Ronningen, R. M. Wu, X. Zeller, A. F. Remec, I. GP IEEE TI Determination of component activation and radiation environment in the second stripping region of a high-power heavy-ion linear accelerator SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB In supporting pre-conceptual research and development of the Rare-Isotope Accelerator (RIA) facility or similar next-generation exotic beam facilities, one critical focus area is to estimate the level of activation and radiation in the linear accelerator second stripping region and to determine if remote handling is necessary in this area. A basic geometric layout of the second stripping region having beamline magnets, beam pipes and boxes, a stripper foil, beam slits, and surrounding concrete shielding was constructed for Monte Carlo simulations. Beam characteristics were provided within the stripping region based on this layout. Radiation fields, radioactive inventories, levels of activation, heat loads on surrounding components, and prompt and delayed radiation dose rates were simulated using Monte-Carlo radiation transport code PHITS[1]. Results from simulations using a simplified geometry show that remote handling of foils and slits will be necessary. Simulations using a more realistic geometry were performed and the results agree well with the estimation by the simple model. C1 [Baek, I.; Ronningen, R. M.; Wu, X.; Zeller, A. F.] Michigan State Univ, NSCL, E Lansing, MI 48824 USA. [Remec, I.] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Baek, I (reprint author), Michigan State Univ, NSCL, E Lansing, MI 48824 USA. EM baek@nscl-msu.edu FU [DE-FG02-04ER41313] FX Work supported by DE-FG02-04ER41313 NR 4 TC 0 Z9 0 U1 0 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2981 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303191 ER PT B AU Kostin, MA Baek, I Blideanu, V Bollen, G Lawton, DE Ronningen, RM Vieira, DJ Ahle, LE Reyes, S Whittaker, KL Burgess, TW Conner, DL Gabriel, TA Remec, I AF Kostin, M. A. Baek, I. Blideanu, V. Bollen, G. Lawton, D. E. Ronningen, R. M. Vieira, D. J. Ahle, L. E. Reyes, S. Whittaker, K. L. Burgess, T. W. Conner, D. L. Gabriel, T. A. Remec, I. GP IEEE TI Radiation environment at ISOL target station of rare isotope facility SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Next-generation exotic beam facilities will offer several approaches to produce rare isotopes far from stability. One approach is Isotope Separation On-line, ISOL, which is the isotope production by interactions of light ion beams with heavy nuclei of targets. A pre-conceptual design of an ISOL target station was done as part of the research and development work for the Rare Isotope Accelerator, RIA. This report summarizes results of radiation calculations for the RIA ISOL target station. This includes radiation effects such as prompt radiation at the target station and from neutron sky-shine, activation of ground water, air, and components. C1 [Kostin, M. A.; Baek, I.; Blideanu, V.; Bollen, G.; Lawton, D. E.; Ronningen, R. M.] Michigan State Univ, NSCL, MSU, E Lansing, MI 48824 USA. [Vieira, D. J.] Los Alamos Natl Lab, Los Alamos, NM 87545 USA. [Ahle, L. E.; Reyes, S.; Whittaker, K. L.] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. [Burgess, T. W.; Conner, D. L.; Gabriel, T. A.; Remec, I.] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Kostin, MA (reprint author), Michigan State Univ, NSCL, MSU, E Lansing, MI 48824 USA. EM kostin@nscl.msu.edu FU DOE [DE-FG02-04ER41322] FX Work supported by DOE grant DE-FG02-04ER41322 NR 6 TC 0 Z9 0 U1 0 U2 4 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 2987 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303193 ER PT B AU Blackfield, DT Chen, YJ Harris, JR Nelson, SD Paul, A Poole, B AF Blackfield, D. T. Chen, Y-J Harris, J. R. Nelson, S. D. Paul, A. Poole, B. GP IEEE TI Injector particle simulation and beam transport in a compact linear proton accelerator SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB A compact Dielectric Wall Accelerator (DWA)[1,2,3], with field gradient up to 100 MW/m is being developed to acclerate proton bunches for use in cancer therapy treatment. The injector must create a proton pulse up to several hundred picoseconds, which is then shaped and accelerated with energies up to 250 MeV. The Particle-In-Cell (PIC)code LSP is used to model several aspects of this design. First, we use LSP to obtain the voltage waveform in the A-K gap that will produce a proton bunch with the requisite charge. We then model pulse compression and shaping in the section between the A-K gap and the DWA. We finally use LSP to model the beam transport through the DWA. C1 [Blackfield, D. T.; Chen, Y-J; Harris, J. R.; Nelson, S. D.; Paul, A.; Poole, B.] LLNL, Livermore, CA 94551 USA. RP Blackfield, DT (reprint author), LLNL, Livermore, CA 94551 USA. EM blackfield1@llnl.gov 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3002 EP 3004 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303198 ER PT B AU Nelson, SD Poole, BR Caporaso, GJ AF Nelson, S. D. Poole, B. R. Caporaso, G. J. GP IEEE TI Electromagnetic simulations of linear proton accelerator structures using Dielectric Wall Accelerators SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Proton accelerator structures for medical applications using Dielectric Wall Accelerator (DWA) technology allow for the utilization of high electric field gradients on the order of 100 MV/m to accelerate the proton bunch. Medical applications involving cancer therapy treatment usually desire short bunch lengths on the order of hundreds of picoseconds in order to limit the extent of the energy deposited in the tumor site (in 3D space, time, and deposited proton charge). Electromagnetic simulations of the DWA structure, in combination with injections of proton bunches have been performed using 3D finite difference codes in combination with particle pushing codes. Electromagnetic simulations of DWA structures includes these effects and also include the details of the switch configuration and how that switch time affects the electric field pulse which accelerates the particle beam. C1 [Nelson, S. D.; Poole, B. R.; Caporaso, G. J.] Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. RP Nelson, SD (reprint author), Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. NR 3 TC 0 Z9 0 U1 0 U2 3 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3005 EP 3007 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303199 ER PT B AU Chen, YJ Paul, AC AF Chen, Yu-Jiuan Paul, Arthur C. GP IEEE TI Compact proton accelerator for cancer therapy SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB An investigation is being made into the feasibility of making a compact proton dielectric wall (DWA) accelerator for medical radiation treatment based on the high gradient insulation (HGI) technology. A small plasma device is used for the proton source. Using only electric focusing fields for transporting and focusing the beam on the patient, the compact DWA proton accelerator system can deliver wide and independent variable ranges of beam currents, energies and spot sizes. C1 [Chen, Yu-Jiuan; Paul, Arthur C.] Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. RP Chen, YJ (reprint author), Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. EM yjchen@llnl.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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3008 EP 3010 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303200 ER PT B AU Poole, BR Blackfield, DT Nelson, SD AF Poole, Brian R. Blackfield, Donald T. Nelson, Scott D. GP IEEE TI Particle simulations of a linear dielectric wall proton accelerator SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The dielectric wall accelerator (DWA) is a compact induction accelerator structure that incorporates the accelerating mechanism, pulse forming structure, and switch structure into an integrated module. The DWA consists of stacked stripline Blumlein assemblies, which can provide accelerating gradients in excess of 100 MeV/meter. Blumleins are switched sequentially according to a prescribed acceleration schedule to maintain synchronism with the proton bunch as it accelerates. A finite difference time domain code (FDTD) is used to determine the applied acceleration field to the proton bunch. Particle simulations are used to model the injector as well as the accelerator stack to determine the proton bunch energy distribution, both longitudinal and transverse dynamic focusing, and emittance growth associated with various DWA configurations. C1 [Poole, Brian R.; Blackfield, Donald T.; Nelson, Scott D.] LLNL, Livermore, CA 94550 USA. RP Poole, BR (reprint author), LLNL, Livermore, CA 94550 USA. EM poole1@lnl.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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3011 EP 3013 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303201 ER PT B AU Wang, L Caporaso, GJ Sullivan, JS AF Wang, L. Caporaso, G. J. Sullivan, J. S. GP IEEE TI Electromagnetic and thermal simulations for the switch region of a compact proton accelerator SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB A compact proton accelerator for medical applications is being developed at Lawrence Livermore National Laboratory. The accelerator architecture is based on the dielectric wall accelerator (DWA) concept. One critical area to consider is the switch region. Electric field simulations and thermal calculations of the switch area were performed to help determine the operating limits of silicon carbide (SiC) switches. Different geometries were considered for the field simulation including the shape of the thin indium solder meniscus between the electrodes and SiC. Electric field simulations were also utilized to demonstrate how the field stress could be reduced. Thermal simulations results were analyzed to find the average power capability of the switches. C1 [Wang, L.; Caporaso, G. J.; Sullivan, J. S.] LLNL, Livermore, CA USA. RP Wang, L (reprint author), LLNL, Livermore, CA USA. EM wang22@llnl.gov 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3014 EP 3016 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303202 ER PT B AU Jones, KW Gallegos, FR Erickson, JL AF Jones, Kevin W. Gallegos, Floyd R. Erickson, John L. GP IEEE TI The LANSCE refurbishment (LANSCE-R) project SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB At the core of the Los Alamos Neutron Science Center (LANSCE) accelerator lies an 800-MeV proton linac that drives user facilities for isotope production, proton radiography, ultra-cold neutrons, weapons neutron research and for various sciences using neutron scattering. LANSCE is in the planning phase of a refurbishment project that will sustain reliable facility operations well into the next decade. The general goals for LANSCE-R are to (1) preserve dependable operation of the linac and (2) increase the cost effectiveness of operations. Requirements can be met for overall beam intensity, availability, and reliability with long-term sustainability and minimal disruption to scheduled user programs. The baseline refurbishment project consists of replacing the 201 MHz RF systems, upgrading a substantial fraction of the 805 MHz RF systems, updating the control system, and replacing or improving a variety of diagnostics and accelerator subsystems. C1 [Jones, Kevin W.; Gallegos, Floyd R.; Erickson, John L.] Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Jones, KW (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3017 EP 3019 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303203 ER PT B AU Rybarcyk, L Lyles, J AF Rybarcyk, L. Lyles, J. GP IEEE TI A new bunching scheme for increasing the lansce wnr peak beam current SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The LANSCE linac simultaneously provides both Hand H+ beams to several user facilities. The Weapons Neutron Research (WNR) user facility is configured to accept the H- beam with a typical pulse pattern of one linac; micro-pulse every 1.8 microseconds. This pattern is produced through a combination of chopping and bunching in the 750 keV beam transport. One downside of the chopping process is that the majority of the beam produced by the ion source during each WNR macro-pulse is discarded. By applying a longitudinal bunching action immediately following the ion source, simulations have shown that some of this discarded beam can be used to increase the charge in these micro-pulses. Recently, we began an effort to develop this buncher by superimposing 16.77 MHz RF voltage on one of the HVDC electrodes in the 80 kV column adjacent to the source. This paper describes the beam dynamics simulations, design and implementation of the RF hardware and the results of tests performed with the system. C1 [Rybarcyk, L.; Lyles, J.] LANL, Los Alamos, NM 87544 USA. RP Rybarcyk, L (reprint author), LANL, Los Alamos, NM 87544 USA. EM lrbarcyk@lanl.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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3020 EP 3022 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303204 ER PT B AU Tarvainen, O Keller, R Rouleau, G AF Tarvainen, O. Keller, R. Rouleau, G. GP IEEE TI Helicon plasma generator-assisted H(-) ion source development at los alamos neutron science center SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The aim of the helicon plasma generator-assisted negative ion source development at Los Alamos Neutron Science Center (LANSCE) is to use high-density helicon plasmas for producing intense beams of IT ions. Our work consists of two development paths, construction of a hybrid ion source (long-term goal) and replacement of the LANSCE surface converter ion source filaments by a helicon plasma generator (short-term goal). The hybrid ion source is a combination of a long-life plasma cathode, sustained by a helicon plasma generator, with a stationary, pulsed main discharge (multi-cusp If production chamber) directly coupled to each other. The electrons are transferred from the helicon plasma to the cusp-chamber by thermal flow process to ignite and sustain the main discharge. Replacing the filaments of the ion source based on surface conversion process by a helicon plasma generator is a low-cost solution, building upon the well-proven converter-type ion sources. Both development paths are aimed at meeting the beam production goals of the LANSCE 800 MeV linear accelerator refurbishment project. This article provides a brief comparison of these approaches and describes the design and the status of the helicon-driven surface conversion IT ion source. C1 [Tarvainen, O.; Keller, R.; Rouleau, G.] Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Tarvainen, O (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. EM tarvainen@lanl.gov 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3023 EP 3025 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303205 ER PT B AU Sullivan, M Seeman, J Wienands, U Biagini, ME Raimondi, P AF Sullivan, M. Seeman, J. Wienands, U. Biagini, M. E. Raimondi, P. GP IEEE TI Interaction region design for a super-B factory SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB We present a preliminary design of an interaction region for a Super-B Factory with luminosity of 1x1036 cm(-2) sec(-1). The collision has a +/- 17 mrad crossing angle and the first magnetic element starts 0.3 m from the collision point. We show that synchrotron radiation backgrounds are controlled and are at least as good as the backgrounds calculated for the PEP-II accelerator. How the beams get into and out of a shared beam pipe is illustrated along with the control of relatively high synchrotron radiation power from the outgoing beams. The high luminosity makes radiative bhabha backgrounds significantly higher than that of the present B-Factories and this must be addressed as the design is further improved. C1 [Sullivan, M.; Seeman, J.; Wienands, U.] Stanford Linear Accelerator Ctr, POB 20450, Stanford, CA 94309 USA. [Biagini, M. E.; Raimondi, P.] INFN, LNF, Frascati, Italy. RP Sullivan, M (reprint author), Stanford Linear Accelerator Ctr, POB 20450, Stanford, CA 94309 USA. FU Department of Energy [DE-AC03-76SF00515] FX work supported by the Department of Energy under contract number DE-AC03-76SF00515. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3026 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303206 ER PT B AU Wang, L Zimmermann, R AF Wang, L. Zimmermann, R. GP IEEE TI Electron cloud in the wigglers of the positron damping ring of the international linear collider SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The ILC positron damping ring comprises hundreds of meters of wiggler sections, where many more photons than in the arcs are emitted, and with the smallest beam-pipe aperture of the ring. A significant electron-cloud density can therefore be accumulated via photo-emission and via beam-induced multipacting. In field-free regions the electron-cloud build up may be suppressed by adding weak solenoid fields, but the electron cloud remaining in the wigglers as well as in the arc dipole magnets can still drive single-bunch and multi-bunch beam instabilities. This paper studies the electron-cloud formation in an ILC wiggler section for various scenarios, as well as its character, and possible mitigation schemes. C1 [Wang, L.] SLAC, Menlo Pk, CA 94025 USA. [Zimmermann, R.] CERN, Geneva, Switzerland. RP Wang, L (reprint author), SLAC, Menlo Pk, CA 94025 USA. EM wanglf@slac.stanford.edu FU U.S. Department of Energy [DE-AC03-76SF00515] FX Work supported by the U.S. Department of Energy under contract DE-AC03-76SF00515 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3029 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303207 ER PT B AU Wienands, U DeBarger, S Colocho, W Decker, FJ Ecklund, S Fisher, A Fox, J Kulikov, A Novokhatski, A Stanek, M Sullivan, MK Wittmer, W Wright, D Yocky, G AF Wienands, U. DeBarger, S. Colocho, W. Decker, F. -J. Ecklund, S. Fisher, A. Fox, J. Kulikov, A. Novokhatski, A. Stanek, M. Sullivan, M. K. Wittmer, W. Wright, D. Yocky, G. GP IEEE TI A transverse beam instability in the PEP-II HER induced by discharges in the vacuum system SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Towards the end of Run 5, transverse instability in the High Energy Ring (HER) curtailed the maximum beam current achievable during physics running. Techniques used in tracking down this instability included fast monitoring of background radiation, temperatures and vacuum pressure. In this way, the origin of the instability was localized and inspection of the vacuum system revealed several damaged bellows shields. Replacing these units significantly reduced the incident rate but did not eliminate it fully. After the end of the run, a number of damaged rf seals were found, possibly having caused the remaining incidents of instability. In Run 6, instability has recurred. In this paper we will outline the steps taken to diagnose the issue and compare the different signatures of instabilities we have seen in PEP-II. C1 [Wienands, U.; DeBarger, S.; Colocho, W.; Decker, F. -J.; Ecklund, S.; Fisher, A.; Fox, J.; Kulikov, A.; Novokhatski, A.; Stanek, M.; Sullivan, M. K.; Wittmer, W.; Wright, D.; Yocky, G.] SLAC, Stanford, CA USA. RP Wienands, U (reprint author), SLAC, Stanford, CA USA. EM uli@slac.stanford.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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3032 EP 3034 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303208 ER PT B AU Yocky, G Cai, Y Decker, FJ Nosochkov, Y Wienands, U Raimondi, P AF Yocky, G. Cai, Y. Decker, F-J. Nosochkov, Y. Wienands, U. Raimondi, P. GP IEEE TI Optimization of chromatic optics near the half integer in PEP-II SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The PEP-II collider has benefited greatly from the correction of the chromatic flinctions. By optimizing sextupole family strengths, it is possible to correct the non-linear chromaticity, the chromatic beta, and the second order dispersion in both the LER and HER. Having implemented some of these corrections, luminosity was improved in PEP-II by almost 10%. C1 [Yocky, G.; Cai, Y.; Decker, F-J.; Nosochkov, Y.; Wienands, U.] SLAC, Menlo Pk, CA 94025 USA. [Raimondi, P.] INFN, LINF, Frascati, Italy. RP Yocky, G (reprint author), SLAC, Menlo Pk, CA 94025 USA. EM yocky@slac.stanford.edu FU DOE [DE-AC02-76SF00515] FX Work supported by DOE contract DE-AC02-76SF00515 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3035 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303209 ER PT B AU Aleksandrov, A Deibele, C Roseberry, T AF Aleksandrov, A. Deibele, C. Roseberry, T. GP IEEE TI New design of the SNS MEBT chopper deflector SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The chopper system for the Spallation Neutron Source (SNS) provides a gap in the beam for clean extraction from the accumulator ring. It consists of a pre-chopper in the low energy beam transport and a faster chopper in the medium energy beam transport (MEBT). The original "meander line" design of the MEBT chopper deflector was successfully tested with low power beam during the SNS linac commissioning but turned out to be unsuitable for high power beam operation due to poor cooling of the copper strip line through the dielectric substrate. We developed a new deflecting structure, with higher deflection efficiency and with rise and fall time easily customizable to match the available high voltage pulse generator. In this paper we describe design, implementation and beam tests results of the new MEBT chopper deflector. C1 [Aleksandrov, A.; Deibele, C.; Roseberry, T.] Oak Ridge Natl Lab, Oak Ridge, TN 37830 USA. RP Aleksandrov, A (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN 37830 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3038 EP 3040 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303210 ER PT B AU Aleksandrov, A Assadi, S Blokland, W Chu, P Cousineau, S Danilov, V Deibele, C Galambos, J Jeon, D Henderson, S Plum, M Shishlo, A Stockli, M Zhang, Y AF Aleksandrov, A. Assadi, S. Blokland, W. Chu, P. Cousineau, S. Danilov, V. Deibele, C. Galambos, J. Jeon, D. Henderson, S. Plum, M. Shishlo, A. Stockli, M. Zhang, Y. GP IEEE TI Performance of sns front end and warm LINAC SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The Spallation Neutron Source accelerator systems will deliver a 1.0 GeV, 1.4 MW proton beam to a liquid mercury target for neutron scattering research. The accelerator complex consists of an H- injector, capable of producing one-ms-long pulses at 60 Hz repetition rate with 38 mA peak current, a 1 GeV linear accelerator, an accumulator ring and associated transport fines. The 2.5 MeV beam from the Front End is accelerated to 86 MeV in the Drift Tube Linac, then to 185 MeV in a Coupled-Cavity Linac and finally to 1 GeV in the Superconducting Linac. With the completion of beam commissioning, the accelerator complex began operation in June 2006 and beam power is being gradually ramped up toward the design goal. Operational experience with the injector and linac will be presented including chopper performance, transverse emittance evolution along the linac, and the results of a beam loss study. C1 [Aleksandrov, A.; Assadi, S.; Blokland, W.; Chu, P.; Cousineau, S.; Danilov, V.; Deibele, C.; Galambos, J.; Jeon, D.; Henderson, S.; Plum, M.; Shishlo, A.; Stockli, M.; Zhang, Y.] Oak Ridge Natl Lab, Oak Ridge, TN 37830 USA. RP Aleksandrov, A (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN 37830 USA. 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 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3041 EP 3043 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303211 ER PT B AU Han, BX Stockli, MP AF Han, B. X. Stockli, M. P. GP IEEE TI The new LEBT for the spallation neutron source power upgrade project SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB A magnetic 2-source LEBT is proposed for the Spallation Neutron Source Power Upgrade. It allows for switching between the two ion sources within less than an hour. The high-current If beam is transported and injected into the RFQ. A transverse electric chopper at the entrance of the RFQ chops similar to 300 ns beam every similar to 1 mu s. Beam envelope calculations show that the new LEBT is robust because it is capable of perfectly matching the beam into the RFQ for broad ranges of the parameters describing the input beam. Physics design of the individual elements of this new LEBT is also presented. C1 [Han, B. X.; Stockli, M. P.] Oak Ridge Natl Lab, SNS, Oak Ridge, TN 37831 USA. RP Han, BX (reprint author), Oak Ridge Natl Lab, SNS, Oak Ridge, TN 37831 USA. EM hanb@ornl.gov 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3044 EP 3046 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303212 ER PT B AU Alessi, J Beebe, E Brodowski, J Kponou, A Okamura, M Pikin, A Raparia, D Ritter, J Snydstrup, L Zajic, V AF Alessi, J. Beebe, E. Brodowski, J. Kponou, A. Okamura, M. Pikin, A. Raparia, D. Ritter, J. Snydstrup, L. Zajic, V. GP IEEE TI Design and performance of tbe matching beameline between the BNL EBIS and an RFQ SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB A part of a new EBIS-based heavy ion preinjector, the low energy beam transport (LEBT) section between the high current EBIS and the RFQ is a challenging design, because it must serve many functions. In addition to the requirement to provide an efficient matching between the EBIS and the RFQ, this line must serve as a fast "switchyard", allowing singly charged ions from external sources to be transported into the EBIS trap region, and extracted, highly charged ions to be deflected to off-axis diagnostics (time-of-flight or emittance). The space charge of the 5-10 mA extracted heavy ion beam is a major consideration in the design, and the space charge force varies for different ion beams having Q/m from 1-0.16. The line includes electrostatic lenses, spherical and parallel-plate deflectors, magnetic solenoid, and diagnostics for measuring current, charge state distributions, emittance, and profile. A prototype of this beamline has been built and results of tests are presented. C1 [Alessi, J.; Beebe, E.; Brodowski, J.; Kponou, A.; Okamura, M.; Pikin, A.; Raparia, D.; Ritter, J.; Snydstrup, L.; Zajic, V.] Brookhaven Natl Lab, Upton, NY 11973 USA. RP Alessi, J (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. EM alessi@bnl.gov FU US Department of Energy; National Aeronautics and Space Administration FX Work supported by the US Department of Energy and the National Aeronautics and Space Administration. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3065 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303219 ER PT B AU Bai, M Luccio, A Pile, P Makdisi, Y Roser, T AF Bai, M. Luccio, A. Pile, P. Makdisi, Y. Roser, T. GP IEEE TI RHIC SMN flipper SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB This paper proposes a new design of spin flipper for RHIC to obtain full spin flip with the spin tune staying at half integer. The traditional technique of using an rf dipole or solenoid as spin flipper to achieve full spin flip in the presence of full Siberian snake requires one to change the snake configuration to move the spin tune away from half integer [1, 2, 3]. This is not practical for an operational high energy polarized proton collider like RHIC where beam lifetime is sensitive to small betatron tune change. The design of the new spin flipper as well as numerical simulations are presented. C1 [Bai, M.; Luccio, A.; Pile, P.; Makdisi, Y.; Roser, T.] Brookhaven Natl Lab, Upton, NY 11720 USA. RP Bai, M (reprint author), Brookhaven Natl Lab, Upton, NY 11720 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3068 EP 3070 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303220 ER PT B AU Bai, M Cameron, R Luccio, A Huang, H Pitisyn, V Roser, T Tepikian, S AF Bai, M. Cameron, R. Luccio, A. Huang, H. Pitisyn, V. Roser, T. Tepikian, S. GP IEEE TI Snake depolarizing resonance study in RHIC SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Snake depolarizing resonances due to the imperfect cancellation of the accumulated perturbations on the spin precession between snakes were observed at the Relativistic Heavy Ion Collider (RHIC). During the RHIC 2005 and 2006 polarized proton runs, we mapped out the spectrum of odd order snake resonance at Q(y) = 7/10. Here, Q(y) is the beam vertical betatron tune. We also studied the beam polarization after crossing the 7/10th resonance as a function of resonance crossing rate. This paper reports the measured resonance spectrum as well as the results of resonance crossing. C1 [Bai, M.; Cameron, R.; Luccio, A.; Huang, H.; Pitisyn, V.; Roser, T.; Tepikian, S.] Brookhaven Natl Lab, Upton, NY 11973 USA. RP Bai, M (reprint author), Brookhaven Natl Lab, Upton, NY 11973 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3071 EP 3073 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303221 ER PT B AU Calaga, R Dorda, U Tomas, R Zimmermann, F Akai, K Ohmi, K Oide, K AF Calaga, R. Dorda, U. Tomas, R. Zimmermann, F. Akai, K. Ohmi, K. Oide, K. GP IEEE TI Small angle crab compensation for LHC ir upgrade SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB A small angle crab scheme is being considered for the LHC luminosity upgrade. In this paper we present a 400MHz superconducting cavity design and discuss the pertinent RF challenges. We also present a study on E the beam-beam performance and proton-beam emittance growth in the presence of crab compensation, with RF noise sources. C1 [Calaga, R.] Brookhaven Natl Lab, Upton, NY 11973 USA. [Dorda, U.; Tomas, R.; Zimmermann, F.] CERN, CH-1211 Geneva 23, Switzerland. [Akai, K.; Ohmi, K.; Oide, K.] KEK, Ibaraki, Japan. RP Calaga, R (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. FU US Department of Energy; European Community-Research Infrastructure Activity under the FP6 "Structuring the European Research Area" [RII3-CT-2003-506395] FX This work was partially performed under the auspices of the US Department of Energy; we also acknowledge the support of the European Community-Research Infrastructure Activity under the FP6 "Structuring the European Research Area" programme (CARE, contract number RII3-CT-2003-506395) 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3074 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303222 ER PT B AU Fischer, W Blaskiewicz, M Calaga, R Cameron, R Luo, Y Pieloni, T AF Fischer, W. Blaskiewicz, M. Calaga, R. Cameron, R. Luo, Y. Pieloni, T. GP IEEE TI Transverse beam transfer functions of colliding beams in RHIC SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB We use transverse beam transfer functions to measure tune distributions of colliding beams in RHIC. The tune has a distribution due to the beam-beam interaction, nonlinear magnetic fields - particularly in the interaction region magnets, and non-zero chromaticity in conjunction with momentum spread. The measured tune distributions are compared with calculations. C1 [Fischer, W.; Blaskiewicz, M.; Calaga, R.; Cameron, R.; Luo, Y.] BNL, Upton, NY USA. [Pieloni, T.] CERN, CH-1211 Geneva 23, Switzerland. [Pieloni, T.] Ecole Polytech Fed Lausanne, Lausanne, Switzerland. RP Fischer, W (reprint author), BNL, Upton, NY USA. EM Wolfram.Fischer@bnl.gov FU US DOE [DE-AC02-98CH10886] FX Work supported by US DOE under contract DE-AC02-98CH10886. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3077 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303223 ER PT B AU Ahrens, L Alessi, J Benjamin, J Blaskiewicz, M Brennan, JM Brown, KA Carlson, C Fischer, W Gardner, CJ Glenn, JW Harvey, M Hayes, T Huang, H Marr, G Morris, J Pilat, R Roser, T Severino, R Smith, KS Steski, D Thieberger, R Tsoupas, N Zaltsman, A Zeno, K AF Ahrens, L. Alessi, J. Benjamin, J. Blaskiewicz, M. Brennan, J. M. Brown, K. A. Carlson, C. Fischer, W. Gardner, C. J. Glenn, J. W. Harvey, M. Hayes, T. Huang, Haixin Marr, G. Morris, J. Pilat, R. Roser, T. Severino, R. Smith, K. S. Steski, D. Thieberger, R. Tsoupas, N. Zaltsman, A. Zeno, K. GP IEEE TI Setup and performance of the RHIC injector accelerators for the 2007 run with gold ions SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Gold ions for the 2007 run [1] of the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory (BNL) are accelerated in the Tandem, Booster and AGS prior to injection into RHIC. The setup and performance of this chain of accelerators is reviewed with a focus on improvements in the quality of beam delivered to RHIC. In particular, more uniform stripping foils between Booster and AGS, and a new bunch merging scheme in AGS have provided beam bunches with reduced longitudinal emittance for RHIC. C1 [Ahrens, L.; Alessi, J.; Benjamin, J.; Blaskiewicz, M.; Brennan, J. M.; Brown, K. A.; Carlson, C.; Fischer, W.; Gardner, C. J.; Glenn, J. W.; Harvey, M.; Hayes, T.; Huang, Haixin; Marr, G.; Morris, J.; Pilat, R.; Roser, T.; Severino, R.; Smith, K. S.; Steski, D.; Thieberger, R.; Tsoupas, N.; Zaltsman, A.; Zeno, K.] Brookhaven Natl Lab, Upton, NY 11973 USA. RP Ahrens, L (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. EM cgardner@bnl.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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3083 EP 3085 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303225 ER PT B AU Hao, Y Litvinenko, VN Montag, C Pozdeyev, E Ptitsyn, V AF Hao, Y. Litvinenko, V. N. Montag, C. Pozdeyev, E. Ptitsyn, V. GP IEEE TI Study of electron-proton beam-beam interaction in eRHIC SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Beam-beam effects present one of major factors limiting the luminosity of colliders. In the linac-ring option of eRHIC design, an electron beam accelerated in a superconducting energy recovery linac collides with a proton beam circulating in the RHIC ring. There are some features of beam-beam effects, which require careful examination in linac-ring configuration. First, the beam-beam interaction can induce specific head-tail type instability of the proton beam referred to as 'kink' instability. Thus, beam stability conditions should be established to avoid proton beam loss. Also, the electron beam transverse disruption by collisions has to be evaluated to ensure beam quality is good enough for the energy recovery pass. In addition, fluctuations of electron beam current and/or electron beam size, as well as transverse offset, can cause proton beam emittance growth. The tolerances for those factors should be determined and possible countermeasures should be developed to mitigate the emittance growth. In this paper, a soft Gaussian strong-strong simulation is used to study all of mentioned beam-beam interaction features and possible techniques to reduce the emittance growth. C1 [Hao, Y.; Litvinenko, V. N.; Montag, C.; Pozdeyev, E.; Ptitsyn, V.] Brookhaven Natl Lab, Upton, NY 11973 USA. RP Hao, Y (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. EM yhao@bnl.gov RI Hao, Yue/D-7153-2013 OI Hao, Yue/0000-0001-8131-7509 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3086 EP 3088 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303226 ER PT B AU Luo, Y Satogata, T Cameron, P Dellapenna, A Trbojevic, D AF Luo, Y. Satogata, T. Cameron, P. Dellapenna, A. Trbojevic, D. GP IEEE TI RHIC beam-based sextupole polarity verification SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB This article presents a beam-based method to check RHIC arc sextupole polarities using local horizontal orbit three-bumps at injection energy. We use I I bumps in each arc, each covering two SFs (focusing sextupoles) and one SD (defocusing sextupole). If there are no wrong sextupole polarities, the tune shifts from bump to bump and the tune shift patterns from arc to arc should be similar. Wrong sextupole polarities can be easily identified from mismatched signs or amplitudes of tune shifts from bump to bump and/or from arc to arc. Tune shifts in both planes during this study were tracked with a high-resolution base-band tunemeter (BBQ) system. This method was successfully used to the sextupole polarity check in RHIC Blue and Yellow rings in the RHIC 2006 and 2007 runs. C1 [Luo, Y.; Satogata, T.; Cameron, P.; Dellapenna, A.; Trbojevic, D.] Brookhaven Natl Lab, Upton, NY 11973 USA. RP Luo, Y (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3089 EP 3091 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303227 ER PT B AU Montag, C Bai, M Beebe-Wang, J Blaskiewicz, M Calaga, R Fischer, W Jain, A Luo, Y Malitsky, N Roser, T Tepikian, S AF Montag, C. Bai, M. Beebe-Wang, J. Blaskiewicz, M. Calaga, R. Fischer, W. Jain, A. Luo, Y. Malitsky, N. Roser, T. Tepikian, S. GP IEEE TI A near-integer working point for polarized protons in the relativistic heavy ion collider SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE ID ACCELERATORS AB To achieve the RHIC polarized proton enhanced luminosity goal of 150.10(30) cm(-2) sec(-1) on average in stores at 250 GeV, the luminosity needs to be increased by a factor of 3 compared to what was achieved in 2006. Since the number of bunches is already at its maximum of I 11, limited by the injection kickers and the experiments' time resolution, the luminosity can only be increased by either increasing the bunch intensity and/or reducing the beam emittance. This leads to a larger beam-beam tuneshift parameter. Operations during 2006 has shown that the beam-beam interaction is already dominating the luminosity lifetime. To overcome this limitation, a near-integer working point is under study. We will present recent results of these studies. C1 [Montag, C.; Bai, M.; Beebe-Wang, J.; Blaskiewicz, M.; Calaga, R.; Fischer, W.; Jain, A.; Luo, Y.; Malitsky, N.; Roser, T.; Tepikian, S.] Brookhaven Natl Lab, Upton, NY 11973 USA. RP Montag, C (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3092 EP 3094 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303228 ER PT B AU Raparia, D Alessi, J Kponou, A Pikin, A Ritter, J Minaev, S Ratzinger, U Schempp, A Tiede, R AF Raparia, D. Alessi, J. Kponou, A. Pikin, A. Ritter, J. Minaev, S. Ratzinger, U. Schempp, A. Tiede, R. GP IEEE TI End-to-end simulations for the EBIS preinjector SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The EBIS Project at Brookhaven National Laboratory is in the second year of a four-year project. It will replace the Tandem Van de Graaff accelerators with an Electron Beam Ion Source, an RFQ, and one IH Linac cavity, as the heavy ion preinjector for the Relativistic Heavy Ion Collider (RHIC), and for the NASA Space Radiation Laboratory (NSRL). The preinjector will provide all ions species, He to U, (Q/m >0.16) at 2 MeV/amu at a repetition rate of 5 Hz, pulse length of 10-40 mu s, and intensities of similar to 2.0 mA. End-to-end simulations (from EBIS to the Booster injection) as well as error sensitivity studies will be presented and physics issues will be discussed. C1 [Raparia, D.; Alessi, J.; Kponou, A.; Pikin, A.; Ritter, J.] Brookhaven Natl Lab, Upton, NY 11973 USA. [Minaev, S.; Ratzinger, U.; Schempp, A.; Tiede, R.] Goethe Univ Frankfurt, IAP, Frankfurt, Germany. RP Raparia, D (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. EM Raparia@bnl.gov FU US Department of Energy; National Aeronautics and Space Administration FX *Work supported by the US Department of Energy and the National Aeronautics and Space Administration. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3095 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303229 ER PT B AU Satogata, T Ahrens, L Bai, M Brennan, JM Bruno, D Butler, J Drees, A Fedotov, A Fischer, W Harvey, M Hayes, T Jappe, W Lee, RC MacKay, WW Malitsky, N Marr, G Michnoff, R Oerter, B Pozdeyev, E Roser, T Severino, F Smith, K Tepikian, S Tsoupas, N AF Satogata, T. Ahrens, L. Bai, M. Brennan, J. M. Bruno, D. Butler, J. Drees, A. Fedotov, A. Fischer, W. Harvey, M. Hayes, T. Jappe, W. Lee, R. C. MacKay, W. W. Malitsky, N. Marr, G. Michnoff, R. Oerter, B. Pozdeyev, E. Roser, T. Severino, F. Smith, K. Tepikian, S. Tsoupas, N. GP IEEE TI RHIC challenges for low energy operations SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB There is significant interest in RHIC heavy ion collisions at root s =5-50 GeV/u, motivated by a search for the QCD phase transition critical point. The lowest energies are well below the nominal RHIC gold injection root s = 19.6 GeV/u. There are several challenges that face RHIC operations in this regime, including longitudinal acceptance, magnet field quality, lattice control, and luminosity monitoring. We report on the status of work to address these challenges, including results from beam tests of low energy RHIC operations with protons and gold. C1 [Satogata, T.; Ahrens, L.; Bai, M.; Brennan, J. M.; Bruno, D.; Butler, J.; Drees, A.; Fedotov, A.; Fischer, W.; Harvey, M.; Hayes, T.; Jappe, W.; Lee, R. C.; MacKay, W. W.; Malitsky, N.; Marr, G.; Michnoff, R.; Oerter, B.; Pozdeyev, E.; Roser, T.; Severino, F.; Smith, K.; Tepikian, S.; Tsoupas, N.] Brookhaven Natl Lab, Upton, NY 11973 USA. RP Satogata, T (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. EM satogata@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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3098 EP 3100 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303230 ER PT B AU Ruggiero, AG Alessi, J Beebe, E Pikin, A Roser, T Trbojevic, D AF Ruggiero, A. G. Alessi, J. Beebe, E. Pikin, A. Roser, T. Trbojevic, D. GP IEEE TI Heavy ion driver with non-scaling FFAG SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB We explore the possibility of using two non-scaling FFAG accelerators for a high power heavy-ion driver as an alternative to a superconducting Linac [1]. Ions of Uranium 238 are accelerated to a kinetic energy of 400 MeV/u and a total power of 400 Matt. Different modes of acceleration have been studied: at 1 and 10 kHz repetition rate, and for Continuous Wave production. The following is a summary of the study. Mere details of the study can be found in [2]. C1 [Ruggiero, A. G.; Alessi, J.; Beebe, E.; Pikin, A.; Roser, T.; Trbojevic, D.] Brookhaven Natl Lab, Upton, NY 11973 USA. RP Ruggiero, AG (reprint author), Brookhaven Natl Lab, Upton, NY 11973 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3101 EP 3103 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303231 ER PT B AU Sekutowicz, J Iversen, J Klinke, D Kostin, D Moeller, W Muhs, A Kneisel, P Smedley, J Rao, T Strzyewski, P Soltan, A Li, Z Ko, K Xiao, L Lefferts, R Lipski, A Ferrario, M AF Sekutowicz, J. Iversen, J. Klinke, D. Kostin, D. Moeller, W. Muhs, A. Kneisel, P. Smedley, J. Rao, T. Strzyewski, P. Soltan, A. Li, Z. Ko, K. Xiao, L. Lefferts, R. Lipski, A. Ferrario, M. GP IEEE TI Status of Nb-Pb superconducting RF-gun cavities SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB We report on the progress and status of an electron RF-gun* made of two superconductors: niobium and lead [1]. The presented design combines the advantages of the RF performance of bulk niobium superconducting cavities and the reasonably high quantum efficiency of lead. The design of RF-gun and performance of 3 test cavities without and with the emitting lead spot are reported in this contribution. Measured quantum efficiency for lead at 2K is presented briefly. More details are reported in [9]. C1 [Sekutowicz, J.; Iversen, J.; Klinke, D.; Kostin, D.; Moeller, W.; Muhs, A.] DESY, Notkestr 85, D-2000 Hamburg, Germany. [Kneisel, P.] TJNAF, Newport News, VA USA. [Smedley, J.; Rao, T.] BNL, Upton, NY USA. [Strzyewski, P.; Soltan, A.] INS, Otwock, Poland. [Li, Z.; Ko, K.; Xiao, L.] SLAC, Menlo Pk, CA USA. [Lefferts, R.; Lipski, A.] SUNY Stony Brook, Stony Brook, NY USA. [Ferrario, M.] INFN, Frascati, Italy. RP Sekutowicz, J (reprint author), DESY, Notkestr 85, D-2000 Hamburg, Germany. FU EU [011935EUROFEL-DS5]; US DOE [DE-AC02-98CH10886] FX This work has been partially supported by the EU Commission, contract no. 011935 EUROFEL-DS5 and US DOE under contract number DE-AC02-98CH10886. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3161 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096303251 ER PT B AU Vaccarezza, C Alesini, D Bellaveglia, M Bertolucci, S Boni, R Boscolo, M Castellano, M Clozza, A Cultrera, L Di Pirro, G Drago, A Esposito, A Ferrario, M Ficcadenti, L Filippetto, D Fusco, V Gallo, A Gatti, G Ghigo, A Ligi, C Marinelli, A Migliorati, M Mostacci, A Pace, E Palumbo, L Pellegrino, L Preger, M Ricci, R Sanelli, C Serio, M Sgamma, F Spataro, B Stella, A Tazzioli, F Vescovi, M Vicario, C Ciocci, F Dattoli, G Dipace, A Doria, A Flora, F Gallerano, GP Giannessi, L Giovenale, E Messina, G Ottaviani, PL Pagnutti, S Parisi, G Picardi, L Quattromini, M Renieri, A Ronci, G Ronsivalle, C Rosetti, M Sabia, E Sassi, M Torre, A Zucchini, A Mattioli, M Pelliccia, D Catani, L Chiadroni, E Cianchi, A Gabrielli, E Schaerf, C Musumeci, P Petrarca, M Alessandria, F Bacci, A Bonifacio, R Boscolo, I Broggi, F De Martinis, C Castelli, F Cialdi, S Giove, D Flacco, A Maroli, C Petrillo, V Rossi, AR Serafmi, L Perrone, A Labat, M Tcherbakoff, O Lambert, G Garzella, D Bougeard, M Breger, P Monchicourt, P Merdji, H Salieres, P Carre, B Couprie, ME Emma, P Pellegrini, C Reiche, S Rosenzweig, J AF Vaccarezza, C. Alesini, D. Bellaveglia, M. Bertolucci, S. Boni, R. Boscolo, M. Castellano, M. Clozza, A. Cultrera, L. Di Pirro, G. Drago, A. Esposito, A. Ferrario, M. Ficcadenti, L. Filippetto, D. Fusco, V. Gallo, A. Gatti, G. Ghigo, A. Ligi, C. Marinelli, A. Migliorati, M. Mostacci, A. Pace, E. Palumbo, L. Pellegrino, L. Preger, M. Ricci, R. Sanelli, C. Serio, M. Sgamma, F. Spataro, B. Stella, A. Tazzioli, F. Vescovi, M. Vicario, C. Ciocci, F. Dattoli, G. Dipace, A. Doria, A. Flora, F. Gallerano, G. P. Giannessi, L. Giovenale, E. Messina, G. Ottaviani, P. L. Pagnutti, S. Parisi, G. Picardi, L. Quattromini, M. Renieri, A. Ronci, G. Ronsivalle, C. Rosetti, M. Sabia, E. Sassi, M. Torre, A. Zucchini, A. Mattioli, M. Pelliccia, D. Catani, L. Chiadroni, E. Cianchi, A. Gabrielli, E. Schaerf, C. Musumeci, P. Petrarca, M. Alessandria, F. Bacci, A. Bonifacio, R. Boscolo, I. Broggi, F. De Martinis, C. Castelli, F. Cialdi, S. Giove, D. Flacco, A. Maroli, C. Petrillo, V. Rossi, A. R. Serafmi, L. Perrone, A. Labat, M. Tcherbakoff, O. Lambert, G. Garzella, D. Bougeard, M. Breger, P. Monchicourt, P. Merdji, H. Salieres, P. Carre, B. Couprie, M. E. Emma, P. Pellegrini, C. Reiche, S. Rosenzweig, J. GP IEEE TI Status of the SPARC-X project SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB SPARC-X is a two branch project consisting in the SPARC test facility dedicated to the development and test of critical subsystems such as high brightness photoinjector and a modular expandable undulator for SASE-FEL experiments at 500 mn with seeding, and the SPARX facility aiming at generation of high brilliance coherent radiation in the 1.5-13 mn range, based on the achieved expertise. The projects are supported by MIUR (Research Department of Italian Government) and Regione Lazio. SPARC has completed the commissionmig phase of the photoinjector in November 2006. The achieved experimental results are here summarized together with the status of the second phase commissioning plans. The SPARX project is based on the generation of ultra high peak brightness electron beams at the energy of 1 and 2 GeV generating radiation in the 1.5-13 mn range. The construction is at the moment planned in two steps starting with a 1 GeV Linac. The project layout including both RF-compression and magnetic chicane techniques has been studied. C1 [Vaccarezza, C.; Alesini, D.; Bellaveglia, M.; Bertolucci, S.; Boni, R.; Boscolo, M.; Castellano, M.; Clozza, A.; Cultrera, L.; Di Pirro, G.; Drago, A.; Esposito, A.; Ferrario, M.; Ficcadenti, L.; Filippetto, D.; Fusco, V.; Gallo, A.; Gatti, G.; Ghigo, A.; Ligi, C.; Marinelli, A.; Migliorati, M.; Mostacci, A.; Pace, E.; Palumbo, L.; Pellegrino, L.; Preger, M.; Ricci, R.; Sanelli, C.; Serio, M.; Sgamma, F.; Spataro, B.; Stella, A.; Tazzioli, F.; Vescovi, M.; Vicario, C.] Ist Nazl Fis Nucl, Lab Nazl Frascati, POB 13, I-00044 Frascati, Italy. [Ciocci, F.; Dattoli, G.; Dipace, A.; Doria, A.; Flora, F.; Gallerano, G. P.; Giannessi, L.; Giovenale, E.; Messina, G.; Ottaviani, P. L.; Pagnutti, S.; Parisi, G.; Picardi, L.; Quattromini, M.; Renieri, A.; Ronci, G.; Ronsivalle, C.; Rosetti, M.; Sabia, E.; Sassi, M.; Torre, A.; Zucchini, A.] ENEA C R, Frascati, Italy. [Mattioli, M.; Pelliccia, D.; Catani, L.; Chiadroni, E.; Cianchi, A.; Gabrielli, E.; Schaerf, C.] INFN Roma II, Rome, Italy. [Musumeci, P.; Petrarca, M.; De Martinis, C.; Castelli, F.; Cialdi, S.; Giove, D.; Flacco, A.; Maroli, C.; Petrillo, V.] INFN Milano, Milan, Italy. [Perrone, A.] Ist Nazl Fis Nucl, Lecce, Italy. [Labat, M.; Tcherbakoff, O.; Lambert, G.; Garzella, D.; Bougeard, M.; Breger, P.; Monchicourt, P.; Merdji, H.; Salieres, P.; Carre, B.] DSM DRECAM, Serv Photons Atomes & Mol, CEA Saclay, Gif Sur Yvette, France. [Couprie, M. E.] SOLEIL, Gif Sur Yvette, France. [Emma, P.] SLAC, Menlo Pk, CA 94025 USA. [Pellegrini, C.; Reiche, S.; Rosenzweig, J.] Univ Calif Los Angeles, Los Angeles, CA 90095 USA. RP Vaccarezza, C (reprint author), Ist Nazl Fis Nucl, Lab Nazl Frascati, POB 13, I-00044 Frascati, Italy. RI Pelliccia, Daniele/A-3140-2012; Gatti, Giancarlo/K-3345-2013; SALIERES, Pascal/L-7776-2014 OI Pelliccia, Daniele/0000-0001-8751-2620; Gatti, Giancarlo/0000-0001-7730-7893; SALIERES, Pascal/0000-0001-5899-8246 FU EU Commission in the sixth framework program [011935]; MIUR (Research Department of Italian Government) FX Work partially supported by the EU Commission in the sixth framework program. Contract No. 011935 EUROFEL and MIUR (Research Department of Italian Government. NR 3 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3200 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304002 ER PT B AU Park, JH Park, SJ Kim, C Parc, YW Huang, JY Ko, IS Xiang, D AF Park, Jangho Park, Sung-Ju Kim, Changbum Parc, Yong-Woon Huang, Jung Yun Ko, In Soo Xiang, Dao GP IEEE TI Experimental approaches for the beam dynamics study in the PC RF gun at the PAL SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB A high-brightness electron beam is emitted from a photo-cathode (PC) RF gun for use in the FIR (Far Infrared) facility being built at the Pohang Accelerator Laboratory (PAL). The beam dynamics study for the PAL XFEL injector is essential to generate low emittance electron beam from the PC RF gun. The XFEL injector requires 1 nC beam with short bunch length and low emittance. These conditions are simulated with PARMELA code and then are realized on experimental conditions. The experimental conditions for the XFEL injector are measured with beam diagnostic devices such as ICT and Faraday cup for charge measurement, a spectrometer for beam energy measurement. In this article, we present the experimental approaches of the beam dynamics study for the XFEL injector. C1 [Park, Jangho] Brookhaven Natl Lab, ATF, Upton, NY 11973 USA. RP Park, JH (reprint author), Brookhaven Natl Lab, ATF, Upton, NY 11973 USA. EM wpjho@postech.ac.kr 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3269 EP 3271 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304025 ER PT B AU Borland, M Decker, G Nassiri, A White, M AF Borland, M. Decker, G. Nassiri, A. White, M. GP IEEE TI Configuration, optics, and performance of a 7-GEV energy recovery linac upgrade for the Advanced Photon Source SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The Advanced Photon Source (APS) is a 7-GeV storage ring light source that has been in operation for over a decade. In order to make revolutionary improvements in the performance of the existing APS ring, we are exploring the addition of a 7-GeV energy recovery linac (ERL) [1] to the APS complex. In this paper, we show the possible configuration of such a system, taking into account details of the APS site and the requirement that stored beam capability be preserved. We exhibit a possible configuration for the single-pass, 7-GeV linac. We discuss optical solutions for transport from 10 MeV to 7 GeV and back, including a large turn-around arc that would support 48 additional user beamlines. Tracking results are shown that include incoherent and coherent synchrotron radiation, resulting in predictions of the beamline performance. We also demonstrate the desirability of operation at high beam energy. C1 [Borland, M.; Decker, G.; Nassiri, A.; White, M.] Argonne Natl Lab, Argonne, IL 60439 USA. RP Borland, M (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. EM borland@aps.anl.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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3320 EP 3322 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304042 ER PT B AU Borland, M Emery, L AF Borland, M. Emery, L. GP IEEE TI Evaluation of the possibility of using damping wigglers in the advanced photon source SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The Advanced Photon Source (APS) is a 7-GeV storage ring light source that has been in operation for over a decade. Over time, the performance of the APS has been increased by reduction of the emittance from 8 nm to 3.1 nm and by the use of top-up mode. We continue to explore options for improving the performance further. This paper discusses the possible improvements in emittance that could result from the use of damping wigglers. We also discuss rf and space requirements. C1 [Borland, M.; Emery, L.] Argonne Natl Lab, Argonne, IL 60439 USA. RP Borland, M (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. EM borland@aps.anl.gov 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3323 EP 3325 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304043 ER PT B AU Borland, M Carwardine, J Chae, Y Emery, L Den Hartog, P Harkay, K Lumpkin, A Nassiri, A Sajaev, V Sereno, N Waldschmidt, G Yang, B Dolgashev, V AF Borland, M. Carwardine, J. Chae, Y. Emery, L. Den Hartog, P. Harkay, K. Lumpkin, A. Nassiri, A. Sajaev, V. Sereno, N. Waldschmidt, G. Yang, B. Dolgashev, V. GP IEEE TI Planned use of pulsed crab cavities for short x-ray pulsed generation at the advanced photon source SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Recently, we have explored application to the Advanced Photon Source (APS) of Zholents'[1] crab cavity scheme for production of short x-ray pulses. We assumed use of superconducting (SC) cavities in order to have a continu-ous stream of crabbed bunches and flexibility of operating modes. The challenges of the SC approach are related to the size, cost, and development time of the cavities and associated systems. A good case can be made [2] for a pulsed system using room-temperature cavities. APS has elected to pursue such a system in the near term, with the SC-based system planned for a later date. This paper describes the motivation for the pulsed system and gives an overview of the planned implementation and issues. Among these are overall configuration options and constraints, cavity design options, frequency choice, cavity design challenges, tolerances, instabilities, and diagnostics plans. C1 [Borland, M.; Carwardine, J.; Chae, Y.; Emery, L.; Den Hartog, P.; Harkay, K.; Lumpkin, A.; Nassiri, A.; Sajaev, V.; Sereno, N.; Waldschmidt, G.; Yang, B.] Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. [Dolgashev, V.] SLAC, Menlo Pk, CA 99205 USA. RP Borland, M (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. EM borland@aps.anl.gov FU U.S. Department of Energy; Office of Science; Office of Basic Energy Sciences [DE-AC02-06CH11357] FX Work supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3326 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304044 ER PT B AU Dejus, R Vasserinan, I AF Dejus, R. Vasserinan, I. GP IEEE TI Phasing of two undulators with different K values at the advanced photon source SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Two full-length 2.4-m-long undulators, with period lengths 2.3 cm and 2.7 cm, were installed in tandem in the 5.6-m-long straight section on the storage ring in sector 14. One part of the user research program requires that both undulators be tuned to 12.0 keV and the x-ray intensity maximized. The total intensity is sensitive to the phasing between the undulators, so the distance between the devices must be optimized and the ends tuned appropriately. Because of the different period lengths, the gaps and K values of the undulators will be different: 10.6-mm gap and a K value of 1. 17 for the shorter-period device and 15.7-mm gap and a K value of 0.93 for the longer-period device. A special shield was designed and installed between the devices to eliminate interference. Results of magnetic measurements, tuning, and computer simulations of the spectral performance are presented. C1 [Dejus, R.; Vasserinan, I.] Argonne Natl Lab, Argonne, IL 60439 USA. RP Dejus, R (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. EM dejus@aps.anl.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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3329 EP 3331 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304045 ER PT B AU Guo, W Borland, M Harkay, KC Wang, CX Yang, B AF Guo, W. Borland, M. Harkay, K. C. Wang, C. -X. Yang, B. GP IEEE TI A kilohertz picosecond x-ray pulse generation scheme SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The duration of the x-ray pulse generated at a synchrotron light source is typically tens of picoseconds. Shorter pulses are highly desired by the users. In electron storage rings, the vertical beam size is usually orders of magnitude less than the bunch length due to radiation damping; therefore, a shorter pulse can be obtained by slitting the vertically tilted bunch. Zholents proposed tilting the bunch using rf deflection. We found that tilted bunches can also be generated by a dipole magnet kick. A vertical tilt is developed after the kick in the presence of nonzero chromaticity. The tilt was successfully observed and a 4.2-ps pulse was obtained from a 27-ps electron bunch at the Advanced Photon Source. Based on this principle we propose a short-pulse generation scheme that produces picosecond x-ray pulses at a repetition rate of 1 similar to 2 kHz, which can be used for pump-probe experiments. C1 [Guo, W.] BNL, Upton, NY USA. [Borland, M.; Harkay, K. C.; Wang, C. -X.; Yang, B.] Argonne Natl Lab, Argonne, IL USA. RP Guo, W (reprint author), BNL, Upton, NY USA. EM wguo@bn1.gov FU U.S. Department of Energy; Office of Basic Energy Sciences [W-31-109-ENG-38, DE-AC02-98CH10886] FX This work was supported by the U.S. Department of Energy,Office of Basic Energy Sciences, under Contract No.W-31-109-ENG-38 and No. DE-AC02-98CH10886. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3332 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304046 ER PT B AU Kim, SH Doose, CL AF Kim, S. H. Doose, C. L. GP IEEE TI Development of a model superconducting helical undulator for the ilc positron source SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The helical undulator for the proposed International Linear Collider (ILC) positron source requires highpermeability steel poles and superconducting coils to meet the ILC parameters. A short-model undulator with a period of 14 mm was designed, fabricated including highpermeability steel poles, and tested in LHe. The ends of the model were designed to wind the Nb(3)Sn double helix without any conductor joints. After a few quenches in the first excitation test, the current density in the coil reached 2 1.28 kA/mm(2), which was approximately 90% of the estimated short-sample critical current density. The periodic on-axis fields were mapped at two azimuth angles. Excluding the end fields, the standard deviation of the field amplitudes and higher harmonic coefficients for the periodic field were less than 7 x 10(-3) and 5 x 10(-3), respectively. C1 [Kim, S. H.; Doose, C. L.] Argonne Natl Lab, Argonne, IL 60439 USA. RP Kim, SH (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. EM shkim@aps.anl.gov 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3335 EP 3337 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304047 ER PT B AU Sajaev, V Borland, M Xiao, A AF Sajaev, V. Borland, M. Xiao, A. GP IEEE TI New lattice design for aps storage ring with potential tri-fold increase of the number of insertion devices SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The Advanced Photon source (APS) recently held a ring. workshop on upgrade options for the APS storage ring. Several options were discussed that included both storage ring and energy recovery linac options. Here we present a storage ring lattice that fits into the APS tunnel and has a number of significant improvements over the existing storage ring. The present APS lattice has 40-fold symmetry with each sector having one 5-m-long straight section for insertion device (ID) placement. Each sector also provides one beamline for radiation from the bending magnet. The upgrade lattice preserves locations of the existing insertion devices but provides for increased ID straight section length to accommodate 8-m-long insertion devices. This lattice also decreases emittance by a factor of two down to 1.6 mm.rad. And last but not least, it provides two additional 2.1-m-long ID straight sections per sector with one of these straight sections being parallel to the existing bending magnet beamline. We also present dynamic aperture optimization, lifetime calculations, and other nonlinear-dynamics-related simulations. C1 [Sajaev, V.; Borland, M.; Xiao, A.] Argonne Natl Lab, Argonne, IL 60439 USA. RP Sajaev, V (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. EM sajaev@aps.anl.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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3338 EP 3340 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304048 ER PT B AU Sasaki, S McNulty, I Shimada, T AF Sasaki, Shigerni McNulty, Ian Shimada, Taihei GP IEEE TI A possibility for using an apple undulator to generate a photon beam with transverse optical modes SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB We investigate use of an APPLE-type undulator [1] for generating Laguerre-Gaussian (LG) and Hermite-Gaussian (HG) mode beams. We find that the second harmonic radiation in the circular mode corresponds to an LG beam with l=1, and the second harmonic in the linear mode corresponds to an HG beam with M. The combination of an APPLE undulator and conventional monochromator optics may provide an opportunity for a new type of experimental research in the synchrotron radiation community. C1 [Sasaki, Shigerni; McNulty, Ian; Shimada, Taihei] Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. RP Sasaki, S (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. EM sasaki@aps.anl.gov FU U.S. Department of Energy; Office of Science; Office of Basic Energy Sciences [DE-AC02-06CH11357] FX This work is supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3341 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304049 ER PT B AU Sereno, NS Borland, M Friedsam, H AF Sereno, Nicholas S. Borland, Michael Friedsam, Horst GP IEEE TI An energy recovery Linac upgrade for the advanced photon source located in the storage ring infield SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Recently physicists at the Advanced Photon Source (APS) have begun to explore a revolutionary upgrade based on emerging energy recovery linac (ERL) technology. In an ERL, the energy of the 7-GeV, 100-mA beam is recovered after the beam passes through user beamlines by decelerating the beam back through the same superconducting linac cavities that accelerated it. The main constraint on this upgrade is that the existing APS beamlines must not be disturbed. This requires that the APS storage ring be used as a single-pass transport line in the overall ERL beamline layout. A natural place to locate the ERL is inside the existing APS storage ring "infield" area, which has unoccupied space south of the existing APS injector complex. Other important constraints include minimal disturbance of existing buildings and injector beamlines. The existing injector complex should be preserved so that stored beam operation can be continued throughout and beyond ERL construction and commissioning. In this paper we describe a layout that satisfies these constraints. We also estimate the amount of emittance increase the beam will experience before it is delivered to user beamlines. C1 [Sereno, Nicholas S.; Borland, Michael; Friedsam, Horst] Argonne Natl Lab, Argonne, IL 60439 USA. RP Sereno, NS (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. EM sereno@aps.anl.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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3344 EP 3346 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304050 ER PT B AU Trakhtenberg, E Barsz, T Den Hartog, P Lawrence, G Moog, E Sasaki, S Vasserman, I White, M Goldfarb, G Lagonsky, S Lagonsky, N Sorsher, S Becker, T Dufresne, S Kummerle, W Schuermanno, R AF Trakhtenberg, Emil Barsz, Tom Den Hartog, Patric Lawrence, Glen Moog, Elizabeth Sasaki, Shigemi Vasserman, Isaac White, Marion Goldfarb, Gregory Lagonsky, Sergey Lagonsky, Nikolai Sorsher, Simon Becker, Thomas Dufresne, Scoft Kummerle, Werner Schuermanno, Rob GP IEEE TI LCLS undulator production SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE ID PROTOTYPE AB Design and construction of the undulators for the Linac Coherent Light Source (LCLS) at the Stanford Linear Accelerator Center (SLAC) is the responsibility of Argonne National Laboratory (ANL). A fun-scale prototype undulator was constructed in-house and extensively tested [1] at Argonne's Advanced Photon Source (APS). The device was tunable to well within the LCLS requirements and was stable for five years. Experience constructing the prototype undulator led us to conclude that with appropriate engineering design and detailed assembly procedures, precision undulators can be constructed by highly-qualified industrial vendors without undulator-construction experience. Argonne's detailed technological knowledge and experience were transferred to the successful bidders who produced outstanding undulators. Our production concept for the 3.4-m-long, fixed-gap, planar-hybrid undulators with a 30-mm period is discussed. Manufacturing, quality assurance, and acceptance testing details are also presented. C1 [Trakhtenberg, Emil; Barsz, Tom; Den Hartog, Patric; Lawrence, Glen; Moog, Elizabeth; Sasaki, Shigemi; Vasserman, Isaac; White, Marion] Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. [Lagonsky, Nikolai; Sorsher, Simon] Hi Tech Mfg, Schiller Pk, IL USA. [Becker, Thomas; Dufresne, Scoft; Kummerle, Werner; Schuermanno, Rob] Metalex Mfg, Blue Ash, OH 45242 USA. RP Trakhtenberg, E (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. FU U.S. Dept. of Energy; Office of Science; Office of Basic Energy Sciences [DE AC02-06CH11357, DE AC03-76SF00515] FX Work supported by the U.S. Dept. of Energy, Office of Science, Office of Basic Energy Sciences, under contract numbers DE AC02-06CH11357 and DE AC03-76SF00515. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3347 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304051 ER PT B AU Trakhtenberg, E Vvriemerslage, G AF Trakhtenberg, Emil Vvriemerslage, Greg GP IEEE TI A study of the minimum wall thickness for an extruded aluminium vacuum chamber SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Decreasing an ID vacuum chamber wall thickness is a way to achieve a smaller ID gap and a higher magnetic field without decreasing the clear beam aperture of the chamber. Multiple extruded aluminum ID vacuum chambers with 1-mm wall thickness were developed and fabricated at Argonne for the APS and several other synchrotron radiation facilities [1]. Thinner walls have been avoided due to fear that porosity and defects from the extrusion process would result in vacuum leaks. There were also concerns that thinner walls may have excessive deformation or may not withstand the stresses. Recently, several extrusions have been machined to a wall thickness of less than 1 mm to determine the practical limits. Using the extrusion for the insertion device vacuum chamber (ID VC) for the DESY FEL project with a 9.5-mm inner diameter and the LCLS test vacuum chamber extrusion, we decreased the wall thickness to 0.6, 0.5, and 0.4 mm to test the vacuum integrity for a thin wall in these extrusions. Structural analysis and test results are presented. C1 [Trakhtenberg, Emil; Vvriemerslage, Greg] Argonne Natl Lab, Argonne, IL 60439 USA. RP Trakhtenberg, E (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3350 EP 3351 PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304052 ER PT B AU Waldschraidt, G Lill, R Morrison, L AF Waldschraidt, G. Lill, R. Morrison, L. GP IEEE TI Electromagnetic design of the RF cavity beam position monitor for the LCLS SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB A high-resolution X-band cavity BPM has been developed for the LCLS. A dipole mode cavity and a monopole mode reference cavity have been designed in order to achieve micron-level accuracy of the beam position. The rf properties of the BPM as well as beam interaction with the cavities will be discussed including output power and tuning. In addition, methods will be presented for improving the isolation of the output ports to differentiate between horizontal / vertical beam motion and to reject extraneous modes from affecting the output signal. The predicted simulation results will be compared to data collected from low-power experimental tests. C1 [Waldschraidt, G.; Lill, R.; Morrison, L.] ANL, Argonne, IL 60439 USA. RP Waldschraidt, G (reprint author), ANL, 9700 S Cass Ave, Argonne, IL 60439 USA. EM waidschm@aps.anl.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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3352 EP 3354 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304053 ER PT B AU Yang, BX Lumpkin, AH Landahl, EC Dufresne, EM AF Yang, B. X. Lumpkin, A. H. Landahl, E. C. Dufresne, E. M. GP IEEE TI A design study for photon diagnostics for the aps storage ring short-pulse X-ray source SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB A short x-ray pulse source based on the crab cavity scheme proposed by Zholents is being developed at the Advanced Photon Source (APS). Photon diagnostics that visualize the electron bunches with transverse momentum chirp and verify the performance of the short x-ray pulse are required. We present a design study for the imaging diagnostics inside and outside of the crab cavity zone, utilizing both x-ray and visible synchrotron radiation. The diagnostics outside of the crab cavity zone will be used to map out stable operation parameters of the storage ring with crab cavities and to perform single-bunch, single-pass imaging of the chirped bunch, which facilitates optimizing the performance of the short-pulse source without disturbing other users around the ring. C1 [Yang, B. X.; Lumpkin, A. H.; Landahl, E. C.; Dufresne, E. M.] ANL, Argonne, IL 60439 USA. RP Yang, BX (reprint author), ANL, 9700 S Cass Ave, Argonne, IL 60439 USA. EM bxyang@aps.anl.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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3355 EP 3357 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304054 ER PT B AU Shiltsev, V AF Shiltsev, V. GP IEEE TI New possibilities for beam-beam and space-charge compensation: MCP gun and electron columns SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB We propose to use microchannel plate (MCP) as a gigantic quantum efficiency photo-cathode in electron guns. Another proposal is to use electron columns formed by ionization electrons in a longitudinal magnetic field for compensation of space charge effects in high intensity proton synchrotrons. Strong magnetic field is to assure that transverse distribution of electron space charge in the column is the same as in proton beam. Electrostatic electrodes are to control the accumulation and release of the electrons. Ions are not magnetized and drift away without affecting the compensation. C1 Fermilab Natl Accelerator Lab, Batavia, IL USA. RP Shiltsev, V (reprint author), Fermilab Natl Accelerator Lab, Batavia, IL 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3358 EP 3359 PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304055 ER PT B AU Suller, VP Fedurin, M Jines, P Launey, D Miller, T Wang, Y AF Suller, V. P. Fedurin, M. Jines, P. Launey, D. Miller, T. Wang, Y. GP IEEE TI A proposed multipole wiggler for CAMD SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB New insertion devices, such as a multi-pole wiggler (NPW), are being considered for CAMD. This is a consequence of the growth of CAMD's research program over the last several years, in particular after the commissioning of a 7 T wiggler, which has produced a demand for both higher beam brightness and flux density. A proposal has been submitted to the National Science Foundation for funding for a MPW which would replace the existing 7 T wavelength shifter. The outline specification for this new device is presented and also results of tests of modified optics for the CAMD storage ring which will be needed to accommodate the MPW. The modified optics have a reduced vertical aperture requirement of 20 mm at the location of the MPW. It win also be necessary to up rate the RF system to cope with the increased radiation loss. C1 [Suller, V. P.; Jines, P.; Launey, D.; Miller, T.; Wang, Y.] CAMD, LSU, 6980 Jefferson Highway, Baton Rouge, LA 70806 USA. [Fedurin, M.] Brookhaven Natl Lab, Natl Synchrotron Light Source Dept, Upton, NY 11973 USA. RP Suller, VP (reprint author), CAMD, LSU, 6980 Jefferson Highway, Baton Rouge, LA 70806 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3360 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304056 ER PT B AU Celata, CM Furman, MA Vay, JL Grote, DP AF Celata, C. M. Furman, M. A. Vay, J. -L. Grote, D. P. GP IEEE TI Particle-in-cell calculations of the electron cloud in the ILC positron damping ring wigglers SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The self-consistent code suite WARP-POSINST is being used to study electron cloud effects in the ILC positron damping ring wiggler. WARP is a parallelized, 3D particle-in-cell code which is fully self-consistent for all species. The POSINST models for the production of photoelectrons and secondary electrons are used to calculate electron creation. Mesh refinement and a moving reference frame for the calculation will be used to reduce the computer time needed by several orders of magnitude. We present preliminary results for cloud buildup showing 3D electron effects at the nulls of the vertical wiggler field. First results from a benchmark of WARP-POSINST vs. POSINST are also discussed. C1 [Celata, C. M.; Furman, M. A.; Vay, J. -L.] Lawrence Livermore Natl Lab, Berkeley, CA 94550 USA. [Grote, D. P.] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Celata, CM (reprint author), Lawrence Livermore Natl Lab, Berkeley, CA 94550 USA. FU U.S. Department of Energy [DE-AC02-05CH11231] FX Work supported by the U.S. Department of Energy under Contract No. DE-AC02-05CH11231. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3363 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304057 ER PT B AU Corlett, J Byrd, J Fawley, WM Gullans, M Li, D Lidia, SM Padmore, H Penn, G Pogorelov, I Qiang, J Robin, D Sannibale, F Staples, JW Steier, C Venturini, M Virostek, S Wan, W Wells, R Wilcox, R Wurtele, J Zholents, A AF Corlett, J. Byrd, J. Fawley, W. M. Gullans, M. Li, D. Lidia, S. M. Padmore, H. Penn, G. Pogorelov, I. Qiang, J. Robin, D. Sannibale, F. Staples, J. W. Steier, C. Venturini, M. Virostek, S. Wan, W. Wells, R. Wilcox, R. Wurtele, J. Zholents, A. GP IEEE TI A high repetition rate VUV-soft x-ray FEL concept SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB We report on design studies for a seeded FEL light source that is responsive to the scientific needs of the future. The FEL process increases radiation flux by several orders of magnitude above existing incoherent sources, and offers the additional enhancements attainable by optical manipulations of the electron beam: control of the temporal duration and bandwidth of the coherent output, reduced gain length in the FEL, utilization of harmonics to attain shorter wavelengths, and precise synchronization of the x-ray pulse with seed laser systems. We describe an FEL facility concept based on a high repetition rate RF photocathode gun, that would allow simultaneous operation of multiple independent FEL's, each producing high average brightness, tunable over the VUV-soft x-ray range, and each with individual performance characteristics determined by the configuration of the FEL. SASE, enhanced-SASE (ESASE), seeded, harmonic generation, and other configurations making use of optical manipulations of the electron beam may be employed, providing a wide range of photon beam properties to meet varied user demands. C1 [Corlett, J.; Byrd, J.; Fawley, W. M.; Gullans, M.; Li, D.; Lidia, S. M.; Padmore, H.; Penn, G.; Pogorelov, I.; Qiang, J.; Robin, D.; Sannibale, F.; Staples, J. W.; Steier, C.; Venturini, M.; Virostek, S.; Wan, W.; Wells, R.; Wilcox, R.; Wurtele, J.; Zholents, A.] LBNL, Berkeley, CA 94720 USA. RP Corlett, J (reprint author), LBNL, Berkeley, CA 94720 USA. EM jncorlett@lbl.gov RI wurtele, Jonathan/J-6278-2016 OI wurtele, Jonathan/0000-0001-8401-0297 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3366 EP 3368 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304058 ER PT B AU Nishimura, H Marks, S Robin, DS Schlueter, RD Steier, CA Wan, W AF Nishimura, H. Marks, S. Robin, D. S. Schlueter, R. D. Steier, C. A. Wan, W. GP IEEE TI A low emittance lattice for the advanced light source SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The possibility exists of achieving significantly lower emittances in an electron storage ring by increasing the horizontal betatron time. However, existing magnet locations and strengths in a given ring may be inadequate to implement such an operational mode. For example, the ALS storage ring[l] could lower its emittance to one third of the current value by increasing the horizontal tune from 14.25 to 16.25. Nevertheless, this would come with the cost of large chromaticities that could not be corrected with our existing sextupole magnets. We discuss such operational issues and possible solutions in this paper. C1 [Nishimura, H.; Marks, S.; Robin, D. S.; Schlueter, R. D.; Steier, C. A.; Wan, W.] LBNL, ALS, Berkeley, CA 94720 USA. RP Nishimura, H (reprint author), LBNL, ALS, Berkeley, CA 94720 USA. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3369 EP 3371 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304059 ER PT B AU Nishimura, H Donahue, RJ Duarte, RM Robin, D Sannibale, F Steier, C Wan, W AF Nishimura, H. Donahue, R. J. Duarte, R. M. Robin, D. Sannibale, F. Steier, C. Wan, W. GP IEEE TI ALS top-off simulation studies for radiation safety SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB We plan to commission top-off injection[1,2] at the Advanced Light Source (ALS[3]) in the near future. In order to guarantee radiation safety, we need to exclude the possibility of injecting electrons into the users' photon beam lines because of the very high radiation doses involved in case of such an event. This issue must carefully investigated and experimental tests cannot be easily performed. The only reliable way is through simulation. We have developed a scheme based in exhaustive simulations that accounts for all possible dangerous scenarios and that at the same time requires a reasonable amount of computing time. This paper describes such a method and presents a summary of the studies performed for the ALS at the present time. C1 [Nishimura, H.; Donahue, R. J.; Duarte, R. M.; Robin, D.; Sannibale, F.; Steier, C.; Wan, W.] LBNL, ALS, Berkeley, CA 94720 USA. RP Nishimura, H (reprint author), LBNL, ALS, Berkeley, CA 94720 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3372 EP 3374 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304060 ER PT B AU Penn, G Sessler, AM Wurtele, JS AF Penn, G. Sessler, A. M. Wurtele, J. S. GP IEEE TI A plasma channel beam conditioner for a free electron laser SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB By "conditioning" an electron beam, through establishing a correlation between transverse action and energy within the beam, the performance of free electron lasers (FELs) can be dramatically improved. Under certain conditions, the FEL can perform as if the transverse emittances of the beam were substantially lower than the actual values. After a brief review of the benefits of beam conditioning, we present a method to generate this correlation through the use of a plasma channel. The strong transverse focusing produced by a plasma channel (chosen to have density 10(16)/cm(3)) allows the optimal correlation to be achieved in a reasonable length channel, of order 1 m. This appears to be a convenient and practical method for achieving conditioned beams, in comparison with other methods which require either a long beamline or multiple passes through some type of ring. C1 [Penn, G.; Sessler, A. M.; Wurtele, J. S.] Univ Calif Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. RP Penn, G (reprint author), Univ Calif Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. EM gepenn@lbl.gov RI wurtele, Jonathan/J-6278-2016 OI wurtele, Jonathan/0000-0001-8401-0297 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3375 EP 3377 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304061 ER PT B AU Pogorelov, I Qiang, J Ryne, R Venturini, M Zholents, A Warnock, R AF Pogorelov, I. Qiang, J. Ryne, R. Venturini, M. Zholents, A. Warnock, R. GP IEEE TI Simulation of the microbunching instability in beam delivery systems for free electron lasers SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB In this paper, we examine the growth of the microbunching instability in the electron beam delivery system of a free electron laser (FEL). We present the results of two sets of simulations, one conducted using a direct Vlasov solver, the other using a particle-in-cell code Impact-Z with the number of simulation macroparticles ranging up to 100 million. Discussion is focused on the details of longitudinal dynamics and on numerical values of uncorrelated (slice) energy spread at different points in the lattice. In particular, we assess the efficacy of laser heater in suppression of the instability, and look at the interplay between physical and numerical noise in particle-based simulations. C1 [Pogorelov, I.] NICADD, De Kalb, IL 60115 USA. [Qiang, J.; Ryne, R.; Venturini, M.; Zholents, A.] LBNL, Berkeley, CA 94720 USA. [Warnock, R.] SLAC, Stanford, CA 94025 USA. RP Pogorelov, I (reprint author), NICADD, De Kalb, IL 60115 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3378 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304062 ER PT B AU Portmann, G Kwiatkowski, S Plate, D Julian, J Low, R Baptiste, K Barry, W Robin, D AF Portmann, G. Kwiatkowski, S. Plate, D. Julian, J. Low, R. Baptiste, K. Barry, W. Robin, D. GP IEEE TI Creating a pseudo single bunch at the ALS SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Typically storage ring light sources operate with the maximum number of bunches as possible with a gap for ion clearing. By evenly distributing the beam current the overall beam lifetime is maximized. The Advanced Light Source (ALS) has 2 nanoseconds between the bunches and typically operates with 276 bunches out of a possible 328. For experimenters doing timing experiment this bunch separation is too small and would prefer to see only one or two bunches in the ring. The ALS allocates four weeks every year for dedicated 2-bunch operation. In order to provide more flexible operations and substantially increase the amount of operating time for time-of-flight experimenters, it is being proposed to kick one bunch on a different vertical closed orbit. By spatially separating the light from this bunch from the main bunch train in the beamline, one could potentially have single bunch operation all year round. By putting this bunch in the middle of the ion clearing gap the required bandwidth of the kicker magnets is reduced. Using one kicker magnet running at the ring repetition rate (1.5 MHz), this bunch could be permanently put on a different closed orbit. Using multiple kicker magnets, this bunch could be locally offset at an arbitrary frequency. C1 [Portmann, G.; Kwiatkowski, S.; Plate, D.; Julian, J.; Low, R.; Baptiste, K.; Barry, W.; Robin, D.] Univ Calif Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. RP Portmann, G (reprint author), Univ Calif Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3381 EP 3383 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304063 ER PT B AU Qiang, J Corlett, J Lidia, S Padmore, HA Wan, W Zholents, A Zolotorev, M Adelmann, A AF Qiang, J. Corlett, J. Lidia, S. Padmore, H. A. Wan, W. Zholents, A. Zolotorev, M. Adelmann, A. GP IEEE TI Numerical study of Coulomb scattering effects on electron beam from a nano-tip SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE ID SIMULATION AB Nano-tips with high acceleration gradient around the emission surface have been proposed to generate high brightness beams. However, due to the small size of the tip, the charge density near the tip is very high even for a small number of electrons. The stochastic Coulomb scattering near the tip can degrade the beam quality and cause extra emittance growth and energy spread. In the paper, we present a numerical study of these effects using a direct relativistic N-body model. We found that emittance growth and energy spread, due to Coulomb scattering, can be significantly enhanced with respect to mean-field space-charge calculations. C1 [Qiang, J.; Corlett, J.; Lidia, S.; Padmore, H. A.] LBNL, Berkeley, CA 94720 USA. [Adelmann, A.] PSI, CH-5232 Villigen, Switzerland. RP Qiang, J (reprint author), LBNL, Berkeley, CA 94720 USA. EM jqiang@lbl.gov; andreas.adelmann@psi.ch FU Office of Science; U. S. Department of Energy [DE-AC02-05CH11231] FX Work supported by the Office of Science, U. S. Department of Energy, under Contract No. DE-AC02-05CH11231 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3384 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304064 ER PT B AU Robin, DS Wan, W AF Robin, D. S. Wan, W. GP IEEE TI Exploring the limits of the ALS triple bend lattice SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The triple bend achromat cell of the ALS has been shown to be very flexible and compact. It has been operated in a low emittance mode and a low momentum compaction mode. In fact the lattice can be operated in a large range of different stable modes. Until recently most of these recently discovered modes had not been explored or even known about. Many of these modes have potentially attractive features as compared with the present operational mode. In this paper we take a step back and look at the general stability limits of the lattice. We employ a technique we call GLASS that allows us to rapidly scan and find all possible stable modes and then characterize their associated properties. In this paper we illustrate how the GLASS technique gives a global and comprehensive vision of the capabilities of the lattice. C1 [Robin, D. S.; Wan, W.] LBNL, ALS, Berkeley, CA 94720 USA. RP Robin, DS (reprint author), LBNL, ALS, Berkeley, CA 94720 USA. 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 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3387 EP 3389 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304065 ER PT B AU Wang, GM Chao, YC Liu, CY Wang, GM Zhao, K Lu, XY Zhuang, JJ Liu, CY Liu, ZC Chen, J AF Wang, Guimei Chao, Yu-Chiu Liu, Chuyu Wang, Guimei Zhao, Kui Lu, Xiangyang Zhuang, Jiejia Liu, Chuyu Liu, Zhenchao Chen, Jiaer GP IEEE TI Energy recovery transport design for PKUFEL SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB A SRF linac based free electron laser user facility is under developed at Peking University. Energy recovery Linac technology was chosen for increase of average electron beam current, hence, increase of the free electron laser power. In this paper we present a conceptual design of beam transport line which satisfies requirement of ERL. A chicane consisting of four identical bend magnets is selected for path length adjustment up to 18 degree. R56 of both arcs of the beam line is adjustable for full bunch compression. C1 [Wang, Guimei; Chao, Yu-Chiu; Liu, Chuyu] Jefferson Lab, Newport News, VA USA. [Wang, Guimei; Zhao, Kui; Lu, Xiangyang; Zhuang, Jiejia; Liu, Chuyu; Liu, Zhenchao; Chen, Jiaer] Peking Univ, Inst Heavy Ion Phys, Beijing, Peoples R China. [Wang, Guimei; Zhao, Kui; Lu, Xiangyang; Zhuang, Jiejia; Liu, Chuyu; Liu, Zhenchao; Chen, Jiaer] Peking Univ, MOE Lab Heavy Ion Phys, Beijing, Peoples R China. RP Wang, GM (reprint author), Jefferson Lab, Newport News, VA USA. EM wangguimei@pku.edu.cn; chao@jlab.org FU National 973 Projects; U.S. DOE [DE-AC05-06OR23177] FX Work supported by National 973 Projects and U.S. DOE Contract No. DE-AC05-06OR23177 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3390 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304066 ER PT B AU Steier, C Heimann, P Marks, S Robin, D Schoenlein, R Wan, W Wittmer, W AF Steier, C. Heimann, P. Marks, S. Robin, D. Schoenlein, R. Wan, W. Wittmer, W. GP IEEE TI Successful completion of the femtosecond slicing upgrade at the ALS SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB An upgraded femtosecond slicing facility has been commissioned successfully at the Advanced Light Source. In contrast to the original facility at the ALS which pioneered the concept, the new beamline uses an undulator (the first in-vacuum undulator at the ALS) as the radiator producing the user photon beam. To spatially separate the femtosecond slices in the radiator, a local vertical dispersion bump produced with 12 skew quadrupoles is used. The facility was successfully commissioned during the last 1.5 years and is now used in routine operation. C1 [Steier, C.; Heimann, P.; Marks, S.; Robin, D.; Schoenlein, R.; Wan, W.; Wittmer, W.] Univ Calif Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. RP Steier, C (reprint author), Univ Calif Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. EM CSteier@lbl.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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3393 EP 3395 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304067 ER PT B AU Steier, C Bailey, B Baptiste, K Barry, W Biocca, A Byrne, W Chin, M Donahue, R Duarte, R Fahmie, M Gath, B Jacobson, S Julian, J Jung, JY Kwiatkowski, S Marks, S Mueller, R Nishimura, H ONeill, J Prestemon, S Robin, D Rossi, S Sannibale, R Searvie, T Schlueter, R Shuman, D Stover, G Timossi, C Warwick, T Weber, J Williams, E AF Steier, C. Bailey, B. Baptiste, K. Barry, W. Biocca, A. Byrne, W. Chin, M. Donahue, R. Duarte, R. Fahmie, M. Gath, B. Jacobson, S. Julian, J. Jung, J. Y. Kwiatkowski, S. Marks, S. Mueller, R. Nishimura, H. ONeill, J. Prestemon, S. Robin, D. Rossi, S. Sannibale, R. Searvie, T. Schlueter, R. Shuman, D. Stover, G. Timossi, C. Warwick, T. Weber, J. Williams, E. GP IEEE TI Status of the top-off upgrade of the ALS SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The Advanced Light Source is currently being upgraded for top-off operation. This major facility upgrade will provide an improvement in brightness from soft x-ray undulators of about one order of magnitude and keep the ALS competitive with the newest intermediate energy light sources. Major components of the upgrade include making the booster synchrotron capable of full energy operation, radiation safety studies, improvements to interlocks and collimation systems, diagnostics upgrades as wen as emittance improvements in the main storage ring. Most hardware necessary as part of the upgrade has been installed and commissioned. The radiation safety studies are making good progress and have passed a first outside peer review succesfully. C1 [Steier, C.; Bailey, B.; Baptiste, K.; Barry, W.; Biocca, A.; Byrne, W.; Chin, M.; Donahue, R.; Duarte, R.; Fahmie, M.; Gath, B.; Jacobson, S.; Julian, J.; Jung, J. Y.; Kwiatkowski, S.; Marks, S.; Mueller, R.; Nishimura, H.; ONeill, J.; Prestemon, S.; Robin, D.; Rossi, S.; Sannibale, R.; Searvie, T.; Schlueter, R.; Shuman, D.; Stover, G.; Timossi, C.; Warwick, T.; Weber, J.; Williams, E.] Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. RP Steier, C (reprint author), Lawrence Berkeley Natl Lab, Berkeley, CA 94720 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3396 EP 3398 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304068 ER PT B AU Hao, Y Yu, LH AF Hao, Y. Yu, L. H. GP IEEE TI Quiet start method in HGHG FEL simulation SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE ID FREE-ELECTRON-LASER; GAIN AB Quiet start scheme is broadly utilized in Self Amplified Spontaneous Radiation (SASE) FEL simulations, which is proven to be correct and efficient. Nevertheless, due to the energy modulation and the dispersion section, the High Gain Harmonic Generation (HGHG) FEL simulation will not be improved by the traditional quiet start method. A new approach is presented to largely decrease the number of macro-particles per slice that can be implemented in both time-independent and time-dependent simulation, accordingly expedites the high order harmonic cascade simulation and makes the multi-parameter scanning be possible. C1 [Hao, Y.] Indiana Univ, Bloomington, IN 47405 USA. [Yu, L. H.] BNL, Upton, NY 11973 USA. RP Hao, Y (reprint author), Indiana Univ, Bloomington, IN 47405 USA. EM yhao@bnl.gov FU U.S.DOE [DE-FG02-92ER40747]; NSF [PHY-0552389] FX Work supported by U.S.DOE under contract No DE-FG02- 92ER40747 and NSF under contract No PHY-0552389. 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 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3399 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304069 ER PT B AU Yang, LY Podobedov, B Kramer, SL Lee, SY AF Yang, Lingyun Podobedov, Boris Kramer, S. L. Lee, S. Y. GP IEEE TI NSLS VUV ring lifetime study SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB A series of beam studies was recently done at NSLS VUV ring to better understand the beam lifetime. Lifetime is dominated by Touschek effect, and both beam measurements and simulations show that the dispersion and small physical aperture limits the survival of the particles in the Touschek scattering. The lifetime is significantly limited by large beta(x) at injection septum. C1 [Yang, Lingyun; Podobedov, Boris; Kramer, S. L.] BNL, Upton, NY 11973 USA. [Lee, S. Y.] Indiana Univ, Cyclotron Facil, Bloomington, IN 47408 USA. RP Yang, LY (reprint author), BNL, Upton, NY 11973 USA. EM lyyang@bnl.gov FU NSF [PHY-0552389]; DOE [DEAC02-98CH10886] FX Work supported by grants from NSF PHY-0552389 and DOE DEAC02-98CH10886. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3402 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304070 ER PT B AU Montgomery, EJ Feldman, DW O'Shea, PG Pan, Z Moody, NA Jensen, KL AF Montgomery, E. J. Feldman, D. W. O'Shea, P. G. Pan, Z. Moody, N. A. Jensen, K. L. GP IEEE TI Fabrication and measurement of efficient, robust cesiated dispenser photocathodes SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE ID FREE-ELECTRON LASERS AB Photocathodes for high power free electron lasers face significant engineering and physics challenges in the quest for efficient, robust, long-lived, prompt laser-switched operation. The most efficient semiconductor photocathodes, notably those responsive to visible wavelengths, suffer from poor lifetime due to surface layer degradation, contamination, and desorption. Using a novel dispenser photocathode design, rejuvenation of cesiated surface layers in situ is investigated for semiconductor coatings building on previous results for cesiated metals. Cesium from a sub-surface reservoir diffuses to the surface through a microscopically porous, sintered tungsten matrix to repair the degraded surface layer. The goal of this research is to engineer and demonstrate efficient, robust, long-lived regenerable photocathodes in support of predictive photocathode modeling efforts and suitable for photoinjection applications. C1 [Montgomery, E. J.; Feldman, D. W.; O'Shea, P. G.; Pan, Z.] U MD, College Pk, MD 20742 USA. [Moody, N. A.] Los Alamos Natl Lab, Los Alamos, NM 87545 USA. [Jensen, K. L.] Naval Res Lab, Washington, DC 20375 USA. RP Montgomery, EJ (reprint author), U MD, College Pk, MD 20742 USA. EM ejm1@umd.edu FU Joint Technology Office (JTO); Office of Naval Research (ONR) FX *Work supported by Joint Technology Office (JTO) and Office of Naval Research (ONR). NR 5 TC 0 Z9 0 U1 0 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3405 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304071 ER PT B AU Anderson, SG Barty, CPJ Gibson, DJ Hartemann, FV Messerly, M Shverdin, M Siders, CW Tremaine, AM Badakov, H Frigola, P Fukasawa, A Oshea, B Rosenzweig, JB AF Anderson, S. G. Barty, C. P. J. Gibson, D. J. Hartemann, F. V. Messerly, M. Shverdin, M. Siders, C. W. Tremaine, A. M. Badakov, H. Frigola, P. Fukasawa, A. Oshea, B. Rosenzweig, J. B. GP IEEE TI Commissioning of a high-brightness photoinjector for Compton scattering x-ray sources SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Compton scattering of intense laser pulses with ultrarelativistic electron beams has proven to be an attractive source of high-brightness x-rays with keV to MeV energies. This type of x-ray source requires the electron beam brightness to be comparable with that used in x-ray free-electron lasers and laser and plasma based advanced accelerators. We describe the development and commissioning of a 1.6 cell RF photoinjector for use in Compton scattering experiments at LLNL. Injector development issues such as RF cavity design, beam dynamics simulations, emittance diagnostic development, results of sputtered magnesium photo-cathode experiments, and UV laser pulse shaping are discussed. Initial operation of the photoinjector is described. C1 [Anderson, S. G.; Barty, C. P. J.; Gibson, D. J.; Hartemann, F. V.; Messerly, M.; Shverdin, M.; Siders, C. W.; Tremaine, A. M.] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. [Badakov, H.; Frigola, P.; Fukasawa, A.; Oshea, B.; Rosenzweig, J. B.] UCLA, Los Angeles, CA 90095 USA. RP Anderson, SG (reprint author), Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. FU U.S. Department of Energy by the University of California; Lawrence Livermore National Laboratory [W-7405-Eng-48]; University of California, Los Angeles [DE-FG-98ER45693, DE-FG03-92ER40693] FX This work was performed under the auspices of the U.S. Department of Energy by the University of California, Lawrence Livermore National Laboratory under contract No. W-7405-Eng-48, and by the University of California, Los Angeles under contract numbers DE-FG-98ER45693 and DE-FG03-92ER40693. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3441 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304083 ER PT B AU Hartemann, FV Anderson, SG Barty, CPJ Gibson, DJ Hagmann, CA Johnson, MS Jovanovic, I McNabb, DP Messerly, MJ Pruet, JA Shverdin, MY Siders, CW Tremaine, AM AF Hartemann, F. V. Anderson, S. G. Barty, C. P. J. Gibson, D. J. Hagmann, C. A. Johnson, M. S. Jovanovic, I. McNabb, D. P. Messerly, M. J. Pruet, J. A. Shverdin, M. Y. Siders, C. W. Tremaine, A. M. GP IEEE TI Gamma-ray Compton light source development at LLNL SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB A new class of tunable, monochromatic gamma-ray sources capable of operating at high peak and average brightness is currently being developed at LLNL for nuclear photo-science and applications. These novel systems are based on Compton scattering of laser photons by a high brightness relativistic electron beam produced by an rf photoinjector. Key technologies, basic scaling laws, and recent experimental results are presented, along with an overview of future research and development directions. C1 [Hartemann, F. V.; Anderson, S. G.; Barty, C. P. J.; Gibson, D. J.; Hagmann, C. A.; Johnson, M. S.; Jovanovic, I.; McNabb, D. P.; Messerly, M. J.; Pruet, J. A.; Shverdin, M. Y.; Siders, C. W.; Tremaine, A. M.] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Hartemann, FV (reprint author), Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3444 EP 3446 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304084 ER PT B AU Gibson, DJ Anderson, SG Betts, SM Hartemann, FV Jovanovic, I McNabb, DR Messerly, MJ Pruet, JA Shverdin, MY Siders, CW Tremaine, AM Barty, CPJ AF Gibson, D. J. Anderson, S. G. Betts, S. M. Hartemann, F. V. Jovanovic, I. McNabb, D. R. Messerly, M. J. Pruet, J. A. Shverdin, M. Y. Siders, C. W. Tremaine, A. M. Barty, C. P. J. GP IEEE TI Optimal design of a tunable Thomson-scattering based gamma-ray source SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Thomson-Scattering based systems offer a path to highbrightness high-energy(> 1 MeV) x-ray and gamma-ray sources due to their favorable scaling with electron energy. LLNL is currently engaged in an effort to optimize such a device, dubbed the "Momson-Radiated Extreme X-Ray" (T-REX) source, targeting up to 680 keV photon energy. Such a system requires precise design of the interaction between a high-intensity laser pulse and a high-brightness electron beam. Presented here are the optimal design parameters for such an interaction, including factors such as the collision angle, focal spot size, optimal bunch charge, and laser energy. These parameters were chosen based on extensive modelling using PARMELA and in-house, well-benchmarked scattering simulation codes. C1 [Gibson, D. J.; Anderson, S. G.; Betts, S. M.; Hartemann, F. V.; Jovanovic, I.; McNabb, D. R.; Messerly, M. J.; Pruet, J. A.; Shverdin, M. Y.; Siders, C. W.; Tremaine, A. M.; Barty, C. P. J.] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Gibson, DJ (reprint author), Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3447 EP 3449 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304085 ER PT B AU Jovanovic, I Anderson, SG Betts, SM Brown, C Gibson, DJ Hartemann, FV Hernandez, JE Johnson, M McNabb, DP Messerly, M Pruet, J Shverdin, MY Tremaine, AM Siders, CW Barty, CPJ AF Jovanovic, I. Anderson, S. G. Betts, S. M. Brown, C. Gibson, D. J. Hartemann, F. V. Hernandez, J. E. Johnson, M. McNabb, D. P. Messerly, M. Pruet, J. Shverdin, M. Y. Tremaine, A. M. Siders, C. W. Barty, C. P. J. GP IEEE TI High-energy picosecond laser pulse recirculation for Compton scattering SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE ID PHOTON COLLIDER; ILC AB Frequency upconversion of laser-generated photons by inverse Compton scattering for applications such as nuclear spectroscopy and gamma-gamma collider concepts on the future ILC would benefit from an increase of average source brightness. The primary obstacle to higher average brightness is the relatively small Thomson scattering cross section. It has been proposed that this limitation can be partially overcome by use of laser pulse recirculation. The traditional approach to laser recirculation entails resonant coupling of low-energy pulse train to a cavity through a partially reflective mirror [1]. Here we present an alternative, passive approach that is akin to "burst-mode" operation and does not require interferometeric alignment accuracy. Injection of a short and energetic laser pulse is achieved by placing a thin frequency converter, such as a nonlinear optical crystal, into the cavity in the path of the incident laser pulse. This method leads to the increase of x-ray/gamma-ray energy proportional to the increase in photon energy in frequency conversion. Furthermore, frequency tunability can be achieved by utilizing parametric amplifier in place of the frequency converter. C1 [Jovanovic, I.; Anderson, S. G.; Betts, S. M.; Brown, C.; Gibson, D. J.; Hartemann, F. V.; Hernandez, J. E.; Johnson, M.; McNabb, D. P.; Messerly, M.; Pruet, J.; Shverdin, M. Y.; Tremaine, A. M.; Siders, C. W.; Barty, C. P. J.] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Jovanovic, I (reprint author), Lawrence Livermore Natl Lab, Livermore, CA 94550 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3450 EP 3452 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304086 ER PT B AU Andonian, G Agustsson, R Cook, A Dunning, M Hemsing, E Murokh, A Reiche, S Rosenzweig, J Babzien, M Kusche, K Malone, R Yakimenko, V AF Andonian, G. Agustsson, R. Cook, A. Dunning, M. Hemsing, E. Murokh, A. Reiche, S. Rosenzweig, J. Babzien, M. Kusche, K. Malone, R. Yakimenko, V. GP IEEE TI Chicane radiation measurements with a compressed electron beam at the BNL ATF SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The radiation emitted from a chicane compressor has been studied at the Brookhaven National Laboratory (BNL) Accelerator Test Facility (ATF). Coherent edge radiation (CER) is emitted from a compressed electron beam as it traverses sharp edge regions of a magnet. The compression is accompanied by strong self-fields, which are manifested as distortions in the momentum space called beam bifurcation. Recent measurements indicate that the bunch length is approximately 150 A rms. The emitted THz chicane radiation displays strong signatures of CER. This paper reports on the experimental characterization and subsequent analysis of the chicane radiation measurements at the BNL ATF with a discussion of diagnostics development and implementation. The characterization includes spectral analysis, far-field intensity distribution, and polarization effects. Experimental data is benchmarked to a custom developed start-to-end simulation suite. C1 [Andonian, G.; Agustsson, R.; Cook, A.; Dunning, M.; Hemsing, E.; Murokh, A.] Univ Calif Los Angeles, Los Angeles, CA 90095 USA. [Babzien, M.; Kusche, K.; Malone, R.; Yakimenko, V.] BNL, Upton, NY 11973 USA. RP Andonian, G (reprint author), Univ Calif Los Angeles, Los Angeles, CA 90095 USA. RI Cook, Alan/D-2557-2013 NR 9 TC 0 Z9 0 U1 1 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3453 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304087 ER PT B AU Dunning, M Andonian, G Hemsing, E Reiche, S Rosenzweig, J Babzien, M Yakimenko, V AF Dunning, M. Andonian, G. Hemsing, E. Reiche, S. Rosenzweig, J. Babzien, M. Yakimenko, V. GP IEEE TI Seeded VISA: A 1064nm laser-seeded FEL amplifier at the BNL ATF SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE ID SIMULATION AB An experimental study of a seeded Free Electron Laser (FEL) using the VISA undulator and a Nd:YAG seed laser will be performed at the Accelerator Test Facility (ATF) at Brookhaven National Laboratory. The study is motivated by the demand for a short Rayleigh length FEL amplifier at I micron to allow for high power transmission with minimal damage of transport optics. Planned measurements include transverse and longitudinal coherence, angular distribution, and wavelength spectrum of the FEL radiation. The effects of detuning the electron beam energy will be studied, with an emphasis on control of the radiation emision angles and increase of the amplifier efficiency. Results of start-to-end simulations are also presented. C1 [Dunning, M.; Andonian, G.; Hemsing, E.; Reiche, S.; Rosenzweig, J.] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA. [Babzien, M.; Yakimenko, V.] Brookhaven Natl Lab, Upton, NY USA. RP Dunning, M (reprint author), Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA. NR 14 TC 0 Z9 0 U1 0 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3456 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304088 ER PT B AU Fukasawa, A Badakov, H O'Shea, BD Hemsing, E Rosenzweig, JB Anderson, SG AF Fukasawa, A. Badakov, H. O'Shea, B. D. Hemsing, E. Rosenzweig, J. B. Anderson, S. G. GP IEEE TI The FINDER photoinjector SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The FINDER photoinjector was developed for the inverse Compton scattering experiment under UCLA-LLNL collaboration. The improvements of this gun from SPARC gun [1, 2] at INFN-LNF (Frascati) and previous UCLA versions of the 1.6 cell S-band photoinjector are detailed here. The gun is designed to have large mode separation to suppress 0 mode excitation which may be a cause of the emittance degradation. In an effort to reduce the RF quadrupole effect the full cell tuners are replaced by vacuum ports. The laser ports are also omitted. Two openings of the solenoid shield are added to top and bottom of it where there were only two openings on the sides. S, I of the cavity was presented. The on-axis electric field was measured by the bead drop method to show the good field balance. The magnetic field in the emittance compensation solenoid was measured and the quadrupole components were derived. C1 [Fukasawa, A.; Badakov, H.; O'Shea, B. D.; Hemsing, E.; Rosenzweig, J. B.] Univ Calif Los Angeles, Los Angeles, CA 90095 USA. [Anderson, S. G.] LLNL, Livermore, CA 94550 USA. RP Fukasawa, A (reprint author), Univ Calif Los Angeles, Los Angeles, CA 90095 USA. FU [B558560]; [B565590] FX Work performed under LLNL Agreements B558560 and B565590. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3459 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304089 ER PT B AU Ding, Y Huang, Z Emma, P AF Ding, Y. Huang, Z. Emma, P. GP IEEE TI Integration of the optical replica ultrashort electron bunch diagnostics with the current-enhanced SASE in the LCLS SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB In this paper, we present a feasibility study of integrating the optical replica (OR) ultrashort electron bunch diagnostics with the current-enhanced SASE (ESASE) scheme in the LCLS. Both techniques use an external laser to energy-modulate the electron beam in a short wiggler and then convert the energy modulation to a density modulation in a dispersive section. While ESASE proposes to use the high-current spikes to enhance the FEL signal, the OR technique extracts the coherent optical radiation produced by a density modulated electron beam for frequency resolved optical gating (FROG) diagnostics. We discuss the optimization studies of combining the OR method with the ESASE after the second bunch compressor in the LCLS. Simulation results show that the OR method is capable of reproducing the expected double-horn current profile of a 200-fs bunch. The possibilities and limitations of reconstructing the longitudinal phase space profile are also explored. C1 [Ding, Y.; Huang, Z.; Emma, P.] SLAC, Menlo Pk, CA 94025 USA. RP Ding, Y (reprint author), SLAC, Menlo Pk, CA 94025 USA. EM ding@slac.stanford.edu 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3492 EP 3494 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304100 ER PT B AU Dowell, DH Jongewaard, E Limborg-Deprey, C Schmerge, J Li, Z Xiao, L Wang, I Lewandowski, J Vlieks, A AF Dowell, D. H. Jongewaard, E. Limborg-Deprey, C. Schmerge, J. Li, Z. Xiao, L. Wang, I. Lewandowski, J. Vlieks, A. GP IEEE TI Results of the SLAC LCLS gun high-power RF tests SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The beam quality and operational requirements for the Linac Coherent Light Source (LCLS) currently being constructed at SLAC are exceptional, requiring the design of a new RF photocathode gun for the electron source. Based on operational experience at SLAC's GTF and SDL and ATF at BNL as well as other laboratories, the 1.6cell s-band (2856NIHz) gun was chosen to be the best electron source for the LCLS, however a significant redesign was necessary to achieve the challenging parameters. Detailed 3-D analysis and design was used to produce near-perfect rotationally symmetric rf fields to achieve the emittance requirement. In addition, the thermo-mechanical design allows the gun to operate at 120Hz and a 140MV/m cathode field, or to an average power dissipation of 4kW. Both average and pulsed heating issues are addressed in the LCLS gun design. The first LCLS gun is now fabricated and has been operated with high-power RE The results of these high-power tests are presented and discussed. C1 [Dowell, D. H.; Jongewaard, E.; Limborg-Deprey, C.; Schmerge, J.; Li, Z.; Xiao, L.; Wang, I.; Lewandowski, J.; Vlieks, A.] SLAC, Menlo Pk, CA 94025 USA. RP Dowell, DH (reprint author), SLAC, Menlo Pk, CA 94025 USA. EM dowell@SLAC.Stanford.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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3495 EP 3497 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304101 ER PT B AU Dowelf, DH Jongewaard, E Limborg-Deprey, C Schmerge, JF Vlieks, A AF Dowelf, D. H. Jongewaard, E. Limborg-Deprey, C. Schmerge, J. F. Vlieks, A. GP IEEE TI Measurement and analysis of field emission electrons in the LCLS gun SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The field emission was measured during the highpower testing of the LCLS photocathode RF gun. A careful study and analysis of the field emission electrons, or dark current is important in assessing the gun's internal surface quality in actual operation, especially those surfaces with high fields. The first indication of a good RF gun design and fabrication is short processing time to the required fields and low electron emission at high-fields. The charge per 2 microsecond long RF pulse (the dark charge) was measured as a function of the peak cathode field for the 1.6 cell, 2.856GHz LCLS RF gun. Faraday cup data was taken for cathode peak RF fields up to 120MV/m producing a maximum of 0.6nC/RF pulse for a diamond-turned polycrystalline copper cathode installed in the gun. Digitized images of the dark charge were taken using a 100 micron thick YAG crystal for a range of solenoid fields to determine the location and angular distribution of the field emitters. The IN plots and emitter image analysis will be described in this paper. C1 [Dowelf, D. H.; Jongewaard, E.; Limborg-Deprey, C.; Schmerge, J. F.; Vlieks, A.] SLAC, Menlo Pk, CA USA. RP Dowelf, DH (reprint author), SLAC, Menlo Pk, CA USA. EM dowell@SLAC.Stmford.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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3498 EP 3500 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304102 ER PT B AU Akre, R Castro, J Ding, Y Dowell, D Emma, P Frisch, J Gilevich, S Hays, G Hering, P Huang, Z Iverson, R Krejcik, P Limborg-Deprey, C Loos, H Mahnahri, A Rivetta, C Saleski, M Schmerge, J Schultz, D Turner, J Welch, J White, W Wu, J Froelich, L Limberg, T Prat, E AF Akre, R. Castro, J. Ding, Y. Dowell, D. Emma, P. Frisch, J. Gilevich, S. Hays, G. Hering, Ph. Huang, Z. Iverson, R. Krejcik, P. Limborg-Deprey, C. Loos, H. Mahnahri, A. Rivetta, C. Saleski, M. Schmerge, J. Schultz, D. Turner, J. Welch, J. White, W. Wu, J. Froelich, L. Limberg, T. Prat, E. GP IEEE TI Initial commissioning experience with the LCLS injector SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The Linac Coherent Light Source (LCLS) is a SASE x-ray Free-Electron Laser (FEL) project presently under construction at SLAC [1]. The injector section, from drive-laser and RF photocathode gun through first bunch compressor chicane, was installed in fall 2006. Initial system commissioning with an electron beam is taking place during the spring and summer of 2007. The second phase of construction, including second bunch compressor and full linac, will begin later, in the fall of 2007. We report here on experience gained during the first phase of machine commissioning, including RF photocathode gun, linac booster section, S-band and X-band RF systems, first bunch compressor, and the various beam diagnostics. C1 [Akre, R.; Castro, J.; Ding, Y.; Dowell, D.; Emma, P.; Frisch, J.; Gilevich, S.; Hays, G.; Hering, Ph.; Huang, Z.; Iverson, R.; Krejcik, P.; Limborg-Deprey, C.; Loos, H.; Mahnahri, A.; Rivetta, C.; Saleski, M.; Schmerge, J.; Schultz, D.; Turner, J.; Welch, J.; White, W.; Wu, J.] Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. [Froelich, L.; Limberg, T.; Prat, E.] DESY, Hamburg, Germany. RP Akre, R (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. EM Emma@SLAC.Stanford.edu FU US DOE [DE-AC02-76SF00515] FX Work supported by US DOE contract DE-AC02-76SF00515. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3501 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304103 ER PT B AU Huang, XB AF Huang, Xiaobiao GP IEEE TI Simulation of ultra-short pulses in a storage ring SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE ID RADIATION AB Simulation study was performed with the tracking code Elegant [M. Borland, APS Report LS-287] to show beam quality evolution for a short, intense electron bunch after being injected to the SPEAR3 storage ring. The electron bunch with an intensity of 1 mA (0.78 nC) and a length of nearly 1 ps (FWHM) is found to degrade rapidly due to coherent synchrotron radiation (CSR) which causes large uneven longitudinal phase space distortion. The bunch length remains short and the longitudinal line density remains smooth for about 10 turns. For such a beam to circulate in the ring, a total of 10 W rf power is needed to compensate for the energy loss. C1 Stanford Linear Accelerator Ctr, Menlo Pk, CA 94025 USA. RP Huang, XB (reprint author), Stanford Linear Accelerator Ctr, Menlo Pk, CA 94025 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3504 EP 3506 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304104 ER PT B AU Huang, XB Safranek, J Corbett, J Nosochkov, Y Sebek, J Terebilo, A AF Huang, Xiaobiao Safranek, James Corbett, Jeff Nosochkov, Yuri Sebek, Jim Terebilo, Andrei GP IEEE TI Low alpha mode for SPEAR3 SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB In the interest of obtaining shorter bunch length for shorter X-ray pulses, we have developed a low-alpha operational mode for SPEAR3. In this mode the momentum compaction factor is reduced by a factor of 21 or more from the usual achromat mode by introducing negative dispersion at the straight sections. We successfully stored 100 mA with the normal fill pattern at a lifetime of 30 hrs. The bunch length was measured to be 6.9 ps, compared to 17 ps in the normal mode. In this paper we report our studies on the lattice design and calibration, orbit stability, higher order alpha measurement, lifetime measurement and its dependence on the sextupoles, injection efficiency, longitudinal stability and bunch lengths. C1 [Huang, Xiaobiao; Safranek, James; Corbett, Jeff; Nosochkov, Yuri; Sebek, Jim; Terebilo, Andrei] SLAC, Menlo Pk, CA 94025 USA. RP Huang, XB (reprint author), SLAC, Menlo Pk, CA 94025 USA. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3507 EP 3509 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304105 ER PT B AU Safranek, J Corbett, WJ Hettel, R Huang, X Nosochkov, Y Sebek, J Terebilo, A AF Safranek, J. Corbett, W. J. Hettel, R. Huang, X. Nosochkov, Y. Sebek, J. Terebilo, A. GP IEEE TI SPEAR3 accelerator physics update SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The SPEAR3 [1,2] storage ring at Stanford Synchrotron Radiation Laboratory has been delivering photon beams for three years. We win give an overview of recent and ongoing accelerator physics activities, including 500 mA fills, work toward top-off injection, long-term orbit stability characterization and improvement, fast orbit feedback, new chicane optics, low alpha optics & short bunches, low emittance optics, and MATLAB software. The accelerator physics group has a strong program to characterize and improve SPEAR3 performance. C1 [Safranek, J.; Corbett, W. J.; Hettel, R.; Huang, X.; Nosochkov, Y.; Sebek, J.; Terebilo, A.] SLAC, SSRL, Menlo Pk, CA USA. RP Safranek, J (reprint author), SLAC, SSRL, Menlo Pk, CA USA. EM safranek@slac.stanford.edu 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3510 EP 3512 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304106 ER PT B AU Hussein, YA Spencer, JE AF Hussein, Yasser A. Spencer, James E. GP IEEE TI An efficient 95-GHz, RF-coupled antenna SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB This paper presents an efficient, RF-coupled, 95-GHZ undulatory (snake-like) antenna that can be fabricated using IC technology. While there are many uses for directed power at this frequency our interest is in understanding the propagation of the input power through the circuit and its radiative characteristics for comparison to earlier work in the THz range (see PAC05). 95 GHz was chosen because test equipment was available (WR- 10 waveguide and HP network analyzer). Different materials, heights and widths of the circuit were considered on a low-loss, 0.10-mm thick quartz substrate of 0.75 mu m of elevated gold corresponding to three skin depths. The design is compared to more conventional RF technology using a low energy, high power electron beam and to higher energy, lower power Smith Purcell gratings and free-electron-lasers (FELs). The FDTD results show narrow-band, 80% radiation efficiency with a dipole-like radiation pattern - enhanced by adding periods. Radiated power was calculated using two different techniques that agreed quite well i.e. by integrating the far-field Poynting vector as well as subtracting the output from input power. C1 [Hussein, Yasser A.; Spencer, James E.] SLAC, Menlo Pk, CA 94025 USA. RP Hussein, YA (reprint author), SLAC, Menlo Pk, CA 94025 USA. EM jus@slac.stanford.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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3513 EP 3515 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304107 ER PT B AU Dowell, DH Castro, J Emma, P Frisch, J Gilevich, S Hays, G Hering, P Limborg-Deprey, C Loos, H Miahnahri, A White, W AF Dowell, D. H. Castro, J. Emma, P. Frisch, J. Gilevich, S. Hays, G. Hering, P. Limborg-Deprey, C. Loos, H. Miahnahri, A. White, W. GP IEEE TI LCLS injector drive laser SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Requirements for the LCLS injector drive laser present significant challenges to the design of the system. While progress has been demonstrated in spatial shape, temporal shape, UV generation and rep-rate, a laser that meets all of the LCLS specifications simultaneously has yet to be demonstrated. These challenges are compounded by the stability and reliability requirements. The drive laser and transport system has been installed and tested. We will report on the current operational state of the laser and plans for future improvements. C1 [Dowell, D. H.; Castro, J.; Emma, P.; Frisch, J.; Gilevich, S.; Hays, G.; Hering, P.; Limborg-Deprey, C.; Loos, H.; Miahnahri, A.; White, W.] SLAC, Menlo Pk, CA 94025 USA. RP Dowell, DH (reprint author), SLAC, Menlo Pk, CA 94025 USA. EM gilevich@SLAC.Stanford.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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3516 EP 3518 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304108 ER PT B AU Wolf, Z Kaplunenko, V Levashov, Y Weidemann, A AF Wolf, Zachary Kaplunenko, Vsevolod Levashov, Yurii Weidemann, Achim GP IEEE TI LCLS undulator tuning and fiducialization SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE ID PROTOTYPE AB The LCLS project at SLAC requires 40 undulators: 33 in the beam line, 6 spares, and one reference undulator. A new facility was constructed at SLAC for tuning and fiducializing the undulators. The throughput of the facility must be approximately one undulator per week. The undulator tuning has been partially automated. Fiducialization techniques have been devised. The new facility, the tuning techniques, and the fiducialization techniques will be discussed. C1 [Wolf, Zachary; Kaplunenko, Vsevolod; Levashov, Yurii; Weidemann, Achim] SLAC, Menlo Pk, CA 94025 USA. RP Wolf, Z (reprint author), SLAC, Menlo Pk, CA 94025 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3519 EP 3521 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304109 ER PT B AU Evtushenko, P Benson, S Douglas, D Neil, GR AF Evtushenko, P. Benson, S. Douglas, D. Neil, G. R. GP IEEE TI National High Magnetic Field Laboratory FEL injector design consideration SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB A numerical study of beam dynamics was performed for two injector systems for the proposed National High Magnetic Field Laboratory at the Florida State University (FSU) Free Electron Laser (FEL) facility. The first considered a system consisting of a thermionic DC gun, two buncher cavities operated at 260 MHz and 1.3 GHz and two TESLA type cavities, and is very similar to the injector of the ELBE Radiation Source. The second system we studied uses a DC photogun (a copy of JLab FEL electron gun), one buncher cavity operated at 1.3 GHz and two TESLA type cavities. The study is based on PARMELA simulations and takes into account operational experience of both the JLab FEL and the Radiation Source ELBE. The simulations predict the second system will have a much smaller longitudinal emittance. For this reason the DC photo gun based injector is preferred for the proposed FSU FEL facility. C1 [Evtushenko, P.; Benson, S.; Douglas, D.; Neil, G. R.] TJNAF, Newport News, VA 23606 USA. RP Evtushenko, P (reprint author), TJNAF, Newport News, VA 23606 USA. EM Pavel.Evtushenko@jlab.org 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3522 EP 3524 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304110 ER PT B AU Hofler, A Evtushenko, P Krasihiikov, M AF Hofler, A. Evtushenko, P. Krasihiikov, M. GP IEEE TI RF gun optimization study SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Injector gun design is an iterative process where the designer optimizes a few nonlinearly interdependent beam parameters to achieve the required beam quality for a particle accelerator. Few tools exist to automate the optimization process and thoroughly explore the parameter space. The challenging beam requirements of new accelerator applications such as fight sources and electron cooling devices drive the development of RF and SRF photo injectors. RF and SRF gun design is further complicated because the beam is space charge dominated. A genetic algorithm (GA) has been successfully used to optimize DC photo injector designs at Cornell University [11 and Jefferson Lab [2]. We propose studying how GA techniques can be applied to the design of RF and SRF gun injectors. In this paper, we report on the initial phase of the study where we model and optimize a system that has been benchmarked with beam measurements and simulation. C1 [Hofler, A.; Evtushenko, P.] Jefferson Lab, 12000 Jefferson Ave, Newport News, VA 23606 USA. [Krasihiikov, M.] DESY, D-15738 Zeuthen, Germany. RP Hofler, A (reprint author), Jefferson Lab, 12000 Jefferson Ave, Newport News, VA 23606 USA. EM hofler@jlab.org FU Jefferson Science Associates; LLC under U.S. DOE [DE-AC05-06OR23177]; U.S. Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce this manuscript for U.S. Government FX Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177. The U.S. Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce this manuscript for U.S. Government purposes 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3525 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304111 ER PT B AU Jordan, K Benson, SV Douglas, D Evtushenko, P Hernandez-Garcia, C Neil, GR AF Jordan, Kevin Benson, Stephen V. Douglas, David Evtushenko, Pavel Hernandez-Garcia, Carlos Neil, George R. GP IEEE TI Jlamp: An amplifier-based FEL in the JLab SRF ERL driver SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Notional designs for energy-recovering linac ("ERL") driven high average power free electron lasers ("FEL"s) often invoke amplifier-based architectures. To date, however, amplifier FELs have been limited in average power output to values several orders of magnitude lower than those demonstrated in optical-resonator based systems; this is due at least in part to the limited electron beam powers available from their driver accelerators. In order to directly contrast the performance available from amplifiers to that provided by high-power cavity-based resonators, we have developed a scheme to test an amplifier FEL in the JLab SRF ERL driver. We describe an accelerator system design that can seamlessly and noninvasively integrate a 10 m wiggler into the existing system and which provides, at least in principle, performance that would support high-efficiency lasing in an amplifier configuration. Details of the design and an accelerator performance analysis will be presented. C1 [Jordan, Kevin; Benson, Stephen V.; Douglas, David; Evtushenko, Pavel; Hernandez-Garcia, Carlos; Neil, George R.] Jefferson Lab, Newport News, VA 23606 USA. RP Jordan, K (reprint author), Jefferson Lab, Newport News, VA 23606 USA. EM douglas@jlab.org 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3528 EP 3530 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304112 ER PT B AU Fedurin, M Mortazavi, P Murphy, J Rakowsky, G AF Fedurin, M. Mortazavi, P. Murphy, J. Rakowsky, G. GP IEEE TI Upgrade alternatives for the NSLS superconducting wiggler SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The superconducting wiggler (SCW) with 4.2 Tesla field in 5 main poles has been in operation on the NSLS X-ray storage ring for more than 20 years. The inefficient cryogenic system of this wiggler uses a closed-cycle refrigerator requiring constant maintenance. It is possible to replace this insertion device with a 13-pole SCW originally built by Oxford instruments. The cryostat of this device could be upgraded to reduce the liquid He consumption using cryocoolers, thereby greatly reducing the refrigerator operating expense. A second option is a new design of a SCW featuring internal chicaning.to serve three user beamlines simultaneously All these upgrade possibilities will be described in the paper. C1 [Fedurin, M.; Mortazavi, P.; Murphy, J.; Rakowsky, G.] Brookhaven Natl Lab, NSLS, Upton, NY 11973 USA. RP Fedurin, M (reprint author), Brookhaven Natl Lab, NSLS, Upton, NY 11973 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3534 EP 3536 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304114 ER PT B AU Guo, WM Carr, L Krinsky, S Rose, J AF Guo, Weiming Carr, Larry Krinsky, Samuel Rose, James GP IEEE TI Longitudinal beam parameter tolerances of NSLS-II SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB NSLS-II is a third generation light source under design. The beam stability control has been taken into considertion. In this paper we looked into the longitudinal tolerances. We found that the timing and infrared beamlines are the most susceptible to the longitudinal noise. ne rest of the beamlines are affected because of the dispersion and the momentum dependent vertical divergence effects. We set a tolerance of Delta p/p < 5 x 10(-5) on the longitudinal energy oscillation amplitude. C1 [Guo, Weiming; Carr, Larry; Krinsky, Samuel; Rose, James] BNL, Upton, NY 11764 USA. RP Guo, WM (reprint author), BNL, Upton, NY 11764 USA. EM wguo@bnl.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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3537 EP 3539 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304115 ER PT B AU Lin, FL Guo, WM Krinsky, S AF Lin, Fanglei Guo, Weiming Krinsky, Samuel GP IEEE TI Dispersion tolerance calculation for NSLS-II SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB In this paper we discuss the effect on the emittance of the residual dispersion in the insertion devices. The dispersion in the straights could be generated by the lattice error, trim dipole, and insertion device. The effect on the the emittance is examined, and the dispersion tolerances are given for the NSLS-II. C1 [Lin, Fanglei; Guo, Weiming; Krinsky, Samuel] BNL, Upton, NY USA. RP Lin, FL (reprint author), BNL, Upton, NY USA. EM flin@bnl.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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3540 EP 3542 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304116 ER PT B AU Krinsky, S Bengtsson, J Berg, JS Blaskiewicz, M Blednykh, A Guo, W Malitsky, N Montag, C Podobedov, B Rose, J Towne, N Yu, LH Wang, F AF Krinsky, S. Bengtsson, J. Berg, J. S. Blaskiewicz, M. Blednykh, A. Guo, W. Malitsky, N. Montag, C. Podobedov, B. Rose, J. Towne, N. Yu, L. H. Wang, F. GP IEEE TI Collective effects in the NSLS-II storage ring SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB A new high-brightness synchrotron light source (NSLS-II) is under design at BNL. The 3-GeV NSLS-II storage ring has a double-bend achromatic lattice with damping wigglers installed in zero-dispersion straights to reduce the emittance below 1nm. In this paper, we present an overview of the impact of collective effects upon the performance of the storage ring. Subjects discussed include instability thresholds, Touschek lifetime and intra-beam scattering. C1 [Krinsky, S.; Bengtsson, J.; Berg, J. S.; Blaskiewicz, M.; Blednykh, A.; Guo, W.; Malitsky, N.; Montag, C.; Podobedov, B.; Rose, J.; Towne, N.; Yu, L. H.] Brookhaven Natl Lab, Upton, NY 11973 USA. [Wang, F.] MIT Bates, Middleton, MA 01949 USA. RP Krinsky, S (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. EM krinsky@bnl.gov RI Berg, Joseph/E-8371-2014 OI Berg, Joseph/0000-0002-5955-6973 FU DOE [DE-AC02-98CH10886] FX Work supported by DOE contract DE-AC02-98CH10886 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3543 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304117 ER PT B AU Litvinenko, VN Alduino, J Beavis, D Ben-Zvi, I Blaskiewicz, M Brennan, JM Burrill, A Calaga, R Cameron, P Chang, X Drees, A Ganetis, G Gassner, DM Grimes, JT Hahn, H Hammons, LR Hershcovitch, A Hseuh, HC Jain, AK Kayran, D Kewisch, J Lambiase, R Lederle, DL Longo, C Mahler, G McIntyre, G Meng, W Nehring, T Oerter, B Pai, C Pate, D Phillips, D Pozdeyev, E Rao, T Reich, J Roser, T Russo, T Segalov, Z Smedley, J Smith, K Tuozzolo, J Wang, G Weiss, D Williams, N Wu, Q Yip, K Zaltsman, A Favale, A Bluem, H Cole, M Holmes, D Rathke, J Schultheiss, T Todd, A Buckley, B Delayen, JR Funk, LW Phillips, L Preble, JP Citver, G AF Litvinenko, Vladimir N. Alduino, James Beavis, Dana Ben-Zvi, Ilan Blaskiewicz, Michael Brennan, Joseph Michael Burrill, Andrew Calaga, Rama Cameron, Peter Chang, Xiangyun Drees, Angelika Ganetis, George Gassner, David M. Grimes, Jacob T. Hahn, Harald Hammons, Lee R. Hershcovitch, Ady Hseuh, Hsiao-Chaun Jain, Animesh K. Kayran, Dmitry Kewisch, Jorg Lambiase, Robert Lederle, Dewey L. Longo, Cynthia Mahler, George McIntyre, Gary Meng, Wuzheng Nehring, Thomas Oerter, Brian Pai, Chien Pate, David Phillips, David Pozdeyev, Eduard Rao, Triveni Reich, Jonathan Roser, Thomas Russo, Thomas Segalov, Zvi Smedley, John Smith, Kevin Tuozzolo, Joseph Wang, Gang Weiss, Daniel Williams, Neville Wu, Qiong Yip, Kin Zaltsman, Alex Favale, Anthony Bluem, Hans Cole, Michael Holmes, Douglas Rathke, John Schultheiss, Tom Todd, Alan Buckley, Brandon Delayen, Jean R. Funk, L. Warren Phillips, Larry Preble, Joseph P. Citver, Greg GP IEEE TI Status of R&D energy recovery linac at Brookhaven National Laboratory SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB In this paper we present status and plans for the 20-MeV R&D energy recovery linac (ERL), which is under construction at Collider Accelerator Department at BNL. The facility is based on high current (up to 0.5 A of average current) super-conducting 2.5 MeV RF gun, single-mode super-conducting 5-cell RF linac and about 20-m long return loop with very flexible lattice. The R&D ERL, which is planned for commissioning in early 2009, aims to address many outstanding questions relevant for high current, high brightness energy-recovery linacs. C1 [Litvinenko, Vladimir N.; Alduino, James; Beavis, Dana; Ben-Zvi, Ilan; Blaskiewicz, Michael; Brennan, Joseph Michael; Burrill, Andrew; Calaga, Rama; Cameron, Peter; Chang, Xiangyun; Drees, Angelika; Ganetis, George; Gassner, David M.; Grimes, Jacob T.; Hahn, Harald; Hammons, Lee R.; Hershcovitch, Ady; Hseuh, Hsiao-Chaun; Jain, Animesh K.; Kayran, Dmitry; Kewisch, Jorg; Lambiase, Robert; Lederle, Dewey L.; Longo, Cynthia; Mahler, George; McIntyre, Gary; Meng, Wuzheng; Nehring, Thomas; Oerter, Brian; Pai, Chien; Pate, David; Phillips, David; Pozdeyev, Eduard; Rao, Triveni; Reich, Jonathan; Roser, Thomas; Russo, Thomas; Segalov, Zvi; Smedley, John; Smith, Kevin; Tuozzolo, Joseph; Wang, Gang; Weiss, Daniel; Williams, Neville; Wu, Qiong; Yip, Kin; Zaltsman, Alex] Brookhaven Natl Lab, Upton, NY 11973 USA. [Favale, Anthony; Bluem, Hans; Cole, Michael; Holmes, Douglas; Rathke, John; Schultheiss, Tom] AES, Medford, MA USA. [Todd, Alan] AES, Princeton, NJ USA. [Buckley, Brandon] Cornell Univ, Ithaca, NY 14853 USA. [Delayen, Jean R.; Funk, L. Warren; Phillips, Larry; Preble, Joseph P.] Jefferson Lab, Newport News, VA USA. [Citver, Greg] SUNY Stony Brook, Stony Brook, NY USA. RP Litvinenko, VN (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. EM vl@bnl.gov RI Hammons, Lee/D-6041-2013; Yip, Kin/D-6860-2013; Lambiase, Robert/E-1934-2013; Kayran, Dmitry/E-1876-2013 OI Hammons, Lee/0000-0001-7066-8960; Yip, Kin/0000-0002-8576-4311; Kayran, Dmitry/0000-0002-1156-4384 FU U.S. Department of Energy and Office of Naval Research FX This work is supported the U.S. Department of Energy and Office of Naval Research NR 2 TC 0 Z9 0 U1 0 U2 3 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3546 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304118 ER PT B AU Pinayev, I Rose, J Shaftan, T Yu, LH AF Pinayev, I. Rose, J. Shaftan, T. Yu, L. H. GP IEEE TI Injection simulations for NSLS-II storage ring SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The NSLS-II storage ring [1] will operate in the top-off mode in order to achieve the stability required for full utilization of ultra-small emittance. The injection process is expected to have near 100% efficiency in order to reduce radiation levels. This task is complicated by strong nonlinearities produced by the sextupoles and insertion devices. The simulations described below are perfomed to establish requirements for the injection system including emittance of the injected beam and its stability. C1 [Pinayev, I.; Rose, J.; Shaftan, T.; Yu, L. H.] Brookhaven Natl Lab, NSLS 2 Project, Upton, NY 11973 USA. RP Pinayev, I (reprint author), Brookhaven Natl Lab, NSLS 2 Project, Upton, NY 11973 USA. EM pinayev@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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3549 EP 3551 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304119 ER PT B AU Podobedov, B Yang, L AF Podobedov, Boris Yang, Lingyun GP IEEE TI IBS effects in a wiggler-dominated light source SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Intra-beam scattering (IBS) is often thought of as a fundamental limitation to achieving lower emittance and hence higher brightness in modem storage ring light sources. However, as we show in this paper analytically and by simulations using ZAP and SAD codes, this limitation may no longer be relevant in a wiggle-dominated 3rd generation light source. Instead, lowering the emittance by increasing the amount of wiggler radiation does not result in significant IBS-induced emittance blow-up, as higher beam density (and IBS rates) is compensated by faster radiation damping. We show that under some practical assumptions the relative ratio of the emittance including the IBS effect to the emittance at zero current is emittance-independent. C1 [Podobedov, Boris] BNL, NSLS, Upton, NY USA. [Yang, Lingyun] Indiana Univ, IUCF, Bloomington, IN 47405 USA. RP Podobedov, B (reprint author), BNL, NSLS, Upton, NY USA. EM boris@bnl.gov FU DOE [DE-AC02-98CH10886] FX Work supported by DOE contract number DE-AC02-98CH10886 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3552 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304120 ER PT B AU Pozdeyev, E AF Pozdeyev, E. GP IEEE TI Ion trapping and cathode bombardment by trapped ions in DC photoguns SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB DC photoguns are used to produce high-quality, high-intensity electron beams for accelerator driven applications. Ion bombardment is believed to be the major cause of degradation of the photocathode efficiency. Additionally to ions produced in the accelerating cathode-anode gap, the electron beam can ionize the residual gas in the transport line. These ions are trapped transversely within the beam and can drift back to the accelerating gap and contribute to the bombardment rate of the cathode. This paper proposes a method to reduce the flow of ions produced in the beam transport line and drifting back to the cathode-anode gap by introducing a positive potential barrier that repels the trapped ions. The reduced ion bombardment rate and increased life time of photocathodes will reduce the downtime required to service photoinjectors and associated costs. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Pozdeyev, E (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. EM pozdeyev@bnl.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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3555 EP 3557 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304121 ER PT B AU Rose, J Pinayev, I Shaftan, T AF Rose, J. Pinayev, I. Shaftan, T. GP IEEE TI Design considerations of the NSLS-II injection linac SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The NSLS-II injector system consists of a 3 GeV booster injected by a 200 MeV linac. Specifications of the linac are derived from Booster and Storage ring beam requirements. Linac design considerations are presented to meet these specifications. C1 [Rose, J.; Pinayev, I.; Shaftan, T.] Brookhaven Natl Lab, Upton, NY 11973 USA. RP Rose, J (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. EM rose@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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3558 EP 3560 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304122 ER PT B AU Shaftan, T Rose, J Pinayev, I Heese, R Bengtsson, J Skaritka, J Meng, W Ozaki, S Meier, R Stelmach, C Litvinenko, V Pjerov, S Sharma, S Ganetis, G Hseuh, HC Johnson, ED Tsoupas, N Guo, W Beebe-Wang, J Luccio, AU Yu, LH Raparia, D Wang, D AF Shaftan, T. Rose, J. Pinayev, I. Heese, R. Bengtsson, J. Skaritka, J. Meng, W. Ozaki, S. Meier, R. Stelmach, C. Litvinenko, V. Pjerov, S. Sharma, S. Ganetis, G. Hseuh, H. C. Johnson, E. D. Tsoupas, N. Guo, W. Beebe-Wang, J. Luccio, A. U. Yu, L. H. Raparia, D. Wang, D. GP IEEE TI Conceptual design of the NSLS-II injection system SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB We present the conceptual design of the NSLS-II injection system [1, 2]. The injection system consists of a low-energy linac, booster and transport lines. We review two different injection system configurations; a booster located in the storage ring tunnel and a booster housed in a separate building. We briefly discuss main parameters and layout of the injection system components. C1 [Shaftan, T.; Rose, J.; Pinayev, I.; Heese, R.; Bengtsson, J.; Skaritka, J.; Meng, W.; Ozaki, S.; Meier, R.; Stelmach, C.; Litvinenko, V.; Pjerov, S.; Sharma, S.; Ganetis, G.; Hseuh, H. C.; Johnson, E. D.; Tsoupas, N.; Guo, W.; Beebe-Wang, J.; Luccio, A. U.; Yu, L. H.; Raparia, D.; Wang, D.] Brookhaven Natl Lab, Upton, NY 11973 USA. RP Shaftan, T (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. EM shaftan@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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3561 EP 3563 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304123 ER PT B AU Smedley, J Rao, T Kneisel, P Sekutowicz, J Iversen, J Klinke, D Kostin, D Moller, W Muhs, A Lefferts, R Lipski, A AF Smedley, J. Rao, T. Kneisel, P. Sekutowicz, J. Iversen, J. Klinke, D. Kostin, D. Moeller, W. Muhs, A. Lefferts, R. Lipski, A. GP IEEE TI Photoemission tests of a Pb/Nb superconducting photoinjector SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE ID GUN AB We report recent progress in the development of a hybrid lead/niobium superconducting RF (SRF) photoinjector. The goal of this effort is to produce an injector with the SRF properties of a niobium cavity along with the superior quantum efficiency (QE) of a lead photocathode. Quantum efficiency measurements have been performed on an RF cavity with an electroplated lead plug as the photocathode. The effect of the laser on the RF performance of the cavity was characterized. Further measurements of the cavity RF performance are reported in these proceedings [6]. C1 [Smedley, J.; Rao, T.] BNL, Upton, NY USA. [Kneisel, P.] TJNAF, Newport News, VA USA. [Sekutowicz, J.; Iversen, J.; Klinke, D.; Kostin, D.; Moeller, W.; Muhs, A.] DESY, Hamburg, Germany. [Lefferts, R.; Lipski, A.] SUNY Stony Brook, Stony Brook, NY USA. RP Smedley, J (reprint author), BNL, Upton, NY USA. FU Brookhaven Science Associates, LLC [DE-AC02-98CH10886]; U.S. Department of Energy FX This manuscript has been authored by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy. The United States Government retains, and the publisher, by accepting the article for publication, acknowledges, a world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for the United States Government purposes. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3564 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304124 ER PT B AU Tanabe, T Harder, DA Rakowsky, G Shaftan, T Skaritka, J AF Tanabe, Toshiya Harder, David A. Rakowsky, George Shaftan, Timur Skaritka, John GP IEEE TI Insertion device R&D for NSLS-II SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB NSLS-II is a medium energy storage ring of 3GeV electron beam energy with sub-nm.rad horizontal emittance and top-off capability at 500mA. Damping wigglers will be used not only to reduce the beam emittance but also for broadband sources for users. Cryo-Permanent Magnet Undulators (CPMUs) are considered for hard X-ray planar device, and permanent magnet based Elliptically Polarized Undulators (EPUs) are for soft X-ray polarization control. Rigorous R&D plans have been established to pursue the performance enhancement of the above devices as well as building new types of insertion devices such as high temperature superconducting wiggler/undulators. This paper describes the details of these activities and discuss technical issues. C1 [Tanabe, Toshiya; Harder, David A.; Rakowsky, George; Shaftan, Timur; Skaritka, John] Brookhaven Natl Lab, Upton, NY 11973 USA. RP Tanabe, T (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. EM tanabe@bnl.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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3567 EP 3569 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304125 ER PT B AU Watanabe, T Wang, X Li, R Shen, Y Harder, D Rakowsky, G Murphy, JB Freund, HP AF Watanabe, T. Wang, X. Li, R. Shen, Y. Harder, D. Rakowsky, G. Murphy, J. B. Freund, H. P. GP IEEE TI Efficiency enhancement experiment with a tapered undulator in a single-pass seeded FEL at the NSLS SDL SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The experimental observation of FEL efficiency enhancement using a tapered undulator in a single-pass seeded FEL at the NSLS SDL is reported. The last 2.5 in of the 10 in NISUS undulator was linearly tapered so that the magnetic field strength at the end of the undulator was reduced by 5 %. The FEL energy gain along the undulator was measured for both the tapered and un-tapered undulators. We observed that the FEL efficiency was more than doubled by applying the taper. The experimental results are compared with the numerical simulation code, GENESIS1.3 [1]. We also observed a multi-ring structure in transverse FEL distributions with a tapered undultor. C1 [Watanabe, T.; Wang, X.; Li, R.; Shen, Y.; Harder, D.; Rakowsky, G.; Murphy, J. B.] BNL, Upton, NY 11973 USA. [Freund, H. P.] Sci Applicat Int Corp, Mclean, VA USA. RP Watanabe, T (reprint author), BNL, Upton, NY 11973 USA. EM twatambe@bnl.gov FU NSLS and BNL; Office of Naval Research [N0002405MP70325]; U.S. Department of Energy [DE-AC02-98CH1-886] FX We are grateful for support from the NSLS and BNL di-rectors office and this work is supported by the Office of Naval Research under contract No. N0002405MP70325 and U.S. Department of Energy under contract No. DE-AC02-98CH1-886. The authors are pleased to acknowledge valuable contribution from Boyzie Singh 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3570 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304126 ER PT B AU Wu, Q Ben-Zvi, I Burrill, A Chang, X Kayran, D Rao, T Smedley, J AF Wu, Q. Ben-Zvi, I. Burrill, A. Chang, X. Kayran, D. Rao, T. Smedley, J. GP IEEE TI Thermal emittance measurement design for diamond secondary emission SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Thermal emittance is a very important characteristic of cathodes. A carefully designed method of measuring the thermal emittance of secondary emission from diamond is presented. Comparison of possible schemes is carried out by simulation, and the most accessible and accurate method and values are chosen. Systematic errors can be controlled and maintained at small values, and are carefully evaluated. Aberration and limitations of all equipment are taken into account. C1 [Wu, Q.; Ben-Zvi, I.; Burrill, A.; Chang, X.; Kayran, D.; Rao, T.; Smedley, J.] BNL, Upton, NY 11973 USA. RP Wu, Q (reprint author), BNL, Upton, NY 11973 USA. EM qiowu@bnl.gov RI Kayran, Dmitry/E-1876-2013 OI Kayran, Dmitry/0000-0002-1156-4384 NR 2 TC 0 Z9 0 U1 1 U2 3 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3573 EP 3575 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304127 ER PT B AU Jensen, KL Feldman, DW Montgomery, EJ O'Shea, PG Moody, NA Petillo, J AF Jensen, K. L. Feldman, D. W. Montgomery, E. J. O'Shea, P. G. Moody, N. A. Petillo, J. GP IEEE TI A theoretical photocathode emittance model including temperature and field effects SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB A recently developed model of emittance & brightness of photocathode based on "moments" of the electron emission distribution is extended here to non-zero temperatures and fields. Temperature impacts scattering and affects quantum efficiency. Fields affect emission probability and are important in the presence of low-work function coatings characteristic of cesiated dispenser photocathodes under development. Extensions of theoretical models are given, followed by analysis of their comparison with numerical simulations of the intrinsic emittance and brightness of a photocathode. The methodology is designed to facilitate development of photoemission models into comprehensive particle-in-cell (PIC) codes to address variation in surface coverage and topology. C1 [Moody, N. A.] Los Alamos Natl Lab, Los Alamos, NM 87545 USA. [Petillo, J.] Sci Applicat Int Corp, Burlington, MA 01803 USA. [Jensen, K. L.] Naval Res Lab, Washington, DC 20375 USA. [Feldman, D. W.; Montgomery, E. J.; O'Shea, P. G.] U MD, College Pk, MD 20742 USA. RP Jensen, KL (reprint author), Naval Res Lab, Washington, DC 20375 USA. RI Jensen, Kevin/I-1269-2015 OI Jensen, Kevin/0000-0001-8644-1680 FU Joint Technology Office; the Office of Naval Research FX We gratefully acknowledge support provided by the Joint Technology Office and the Office of Naval Research 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3576 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304128 ER PT B AU Covo, MK Molvik, AW Cohen, RH Friedman, A Seidl, PA Logan, G Bieniosek, F Baca, D Vay, JL Vujic, JL AF Covo, Michel Kireeff Molvik, Arthur W. Cohen, Ronald H. Friedman, Alex Seidl, Peter A. Logan, Grant Bieniosek, Frank Baca, David Vay, Jean-Luc Vujic, Jasmina L. GP IEEE TI Absolute measurement of electron cloud density SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE ID BEAM; ACCELERATOR; ANALYZER AB Beam interaction with background gas and walls produces ubiquitous clouds of stray electrons that frequently limit the performance of particle accelerator and storage rings. Counterintuitively we obtained the electron cloud accumulation by measuring the expelled ions that are originated from the beam-background gas interaction, rather than by measuring electrons that reach the walls. The kinetic ion energy measured with a retarding field analyzer (RFA) maps the depressed beam space-charge potential and provides the dynamic electron cloud density. Clearing electrode current measurements give the static electron cloud background that complements and corroborates with the RFA measurements, providing an absolute measurement of electron cloud density during a 5 mu s duration beam pulse in a drift region of the magnetic transport section of the High-Current Experiment (HCX) at LBNL. C1 [Covo, Michel Kireeff] Lawrence Livermore Natl Lab, Heavy Ion Fus Sci Virtual Natl Lab, Livermore, CA 94550 USA. [Molvik, Arthur W.; Cohen, Ronald H.; Friedman, Alex] Lawrence Livermore Natl Lab, Heavy Ion Fus Sci Virtual Natl Lab, Livermore, CA 94550 USA. [Seidl, Peter A.; Logan, Grant; Bieniosek, Frank; Baca, David; Vay, Jean-Luc] Lawrence Berkeley Natl Lab, Heavy Ion Fus Sci Virtual Natl Lab, Berkeley, CA 94720 USA. [Vujic, Jasmina L.] Univ Calif Berkeley, Berkeley, CA 94720 USA. RP Covo, MK (reprint author), Lawrence Livermore Natl Lab, Heavy Ion Fus Sci Virtual Natl Lab, Livermore, CA 94550 USA. EM kireeffcovol@llnl.gov FU U.S Department of Energy by University of California; Lawrence Livermore and Lawrence Berkeley National Laboratories [W-7405- Eng-48, DE-AC02-05CH11231] FX This work was performed under the auspices of the U.S Department of Energy by University of California, Lawrence Livermore and Lawrence Berkeley National Laboratories under contracts No. W-7405- Eng-48 and DE-AC02-05CH11231 NR 16 TC 0 Z9 0 U1 1 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3585 EP + PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304131 ER PT B AU Fischer, W Blaskiewicz, M Brennan, M Huang, H Hseuh, HC Ptitsyn, V Roser, T Thieberger, P Trbojevic, D Wei, J Zhang, SY AF Fischer, W. Blaskiewicz, M. Brennan, M. Huang, H. Hseuh, H. -C. Ptitsyn, V. Roser, T. Thieberger, P. Trbojevic, D. Wei, J. Zhang, S. Y. GP IEEE TI Electron cloud observations and cures in RHIC SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE ID NONEVAPORABLE GETTER FILMS AB Since 2001 RHIC has experienced electron cloud effects, which have limited the beam intensity. These include dynamic pressure rises - including pressure instabilities, tune shifts, a reduction of the stability threshold for bunches crossing the transition energy, and possibly incoherent emittance growth. We summarize the main observations in operation and dedicated experiments, as well as countermeasures including baking, NEG coated warm beam pipes, solenoids, bunch patterns, anti-grazing rings, pre-pumped cold beam pipes, scrubbing, and operation with long bunches. This article is a short version of [1]. C1 [Fischer, W.; Blaskiewicz, M.; Brennan, M.; Huang, H.; Hseuh, H. -C.; Ptitsyn, V.; Roser, T.; Thieberger, P.; Trbojevic, D.; Wei, J.; Zhang, S. Y.] BNL, Upton, NY 11973 USA. RP Fischer, W (reprint author), BNL, Upton, NY 11973 USA. EM Wolfram.Fischer@bnl.gov NR 50 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3590 EP 3594 PG 5 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304132 ER PT B AU Furman, MA Celata, CM Kireeff-Covo, M Sonnad, KG Vay, JL Venturini, M Cohen, R Friedman, A Grote, D Molvik, A AF Furman, M. A. Celata, C. M. Kireeff-Covo, M. Sonnad, K. G. Vay, J. -L. Venturini, M. Cohen, R. Friedman, A. Grote, D. Molvik, A. GP IEEE TI Self-consistent 3D modeling of electron cloud dynamics and beam response SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE ID SIMULATIONS AB We present recent advances in the modeling of beam-electron-cloud dynamics, including surface effects such as secondary electron emission, gas desorption, etc, and volumetric effects such as ionization of residual gas and charge-exchange reactions. Simulations for the HCX facility with the code WARP/POSINST will be described and their validity demonstrated by benchmarks against measurements. The code models a wide range of physical processes and uses a number of novel techniques, including a large-timestep electron mover that smoothly interpolates between direct orbit calculation and guiding-center drift equations, and a new computational technique, based on a Lorentz transformation to a moving frame, that allows the cost of a fully 3D simulation to be reduced to that of a quasi-static approximation. C1 [Furman, M. A.; Celata, C. M.; Kireeff-Covo, M.; Sonnad, K. G.; Vay, J. -L.; Venturini, M.] LBNL, Berkeley, CA 94720 USA. [Cohen, R.; Friedman, A.; Grote, D.; Molvik, A.] LLNL, Livermore, CA 94550 USA. Tech X Corp, Boulder, CO 80303 USA. RP Furman, MA (reprint author), LBNL, Berkeley, CA 94720 USA. EM jlvay@lbl.gov FU U.S. DOE [DE-AC02-05CH11231, W-7405-Eng-48]; US-LHC Accelerator Research Project (LARP); FNAL Main Injector upgrade program FX Work supported by the U.S. DOE under Contracts DE-AC02-05CH11231 and W-7405-Eng-48, by the US-LHC Accelerator Research Project (LARP), and by the FNAL Main Injector upgrade program NR 35 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3595 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304133 ER PT B AU Scarpetti, RD Nath, S Barraza, J Ekdahl, CA Jacquez, E McCuistian, BT Nielsen, K Schulze, M Seitz, J Caporaso, GJ Chen, YJ Logan, G Bieniosek, F AF Scarpetti, R. D. Nath, S. Barraza, J. Ekdahl, C. A. Jacquez, E. McCuistian, B. T. Nielsen, K. Schulze, M. Seitz, J. Caporaso, G. J. Chen, Y. -J. Logan, G. Bieniosek, F. GP IEEE TI Status of the DARHT 2(nd) axis accelerator at the Los Alamos National Laboratory SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The Dual Axis Radiographic Hydrodynamic Test Facility (DARHT) was constructed at Los Alamos National Laboratory as a radiographic facility to provide dual-axis multi-time radiography to support the US Stockpile Stewardship Program. The DARHT 1(st) Axis has been operational since 1999 and has been providing excellent radiographs. The DARHT 2(nd) Axis construction project was completed in early 2003. However, during the subsequent commissioning efforts to bring it to the fun specifications of 17 MeV, 2 kA and 2 micro-second pulse length, high voltage breakdown was observed in several of the 78 induction accelerator cells [1]. In January 2004, the DARHT 2(nd) Axis Refurbishment and Commissioning Project was launched. It is a Los Alamos National Laboratory effort in collaboration with the Lawrence Livermore and Lawrence Berkeley National Laboratories. Its purpose is to first address the HV breakdown problems with the 2nd axis accelerator cells [2], address the remaining physics of the multi-pulse electromagnetic kicker and X-ray converter target and then commission the full energy 2nd axis accelerator. The redesign of the cell as well as long pulse beam stability tests were completed in 2005. Testing of the multi-pulse electromagnetic kicker and X-ray converter target was completed in February of this year using an 8 MeV scaled accelerator that used twenty-six refurbished accelerator cells. Commissioning of the 2nd axis 2.5 MV, 2.0 kA electron injector and the full-energy accelerator beamline is currently underway. Commissioning of the downstream transport section and multi-pulse kicker will begin in early October of this year after accelerator commissioning is completed. Target commissioning is scheduled to begin in November 2007. The DARHT 2(nd) axis is scheduled for completion in early 2008, at which point the DARHT facility will be ready to support two-axis, multi-pulse radiography in support of the Stockpile Stewardship Program. In this paper, we present the overall project status, commissioning strategy and schedule. C1 [Scarpetti, R. D.; Nath, S.; Barraza, J.; Ekdahl, C. A.; Jacquez, E.; McCuistian, B. T.; Nielsen, K.; Schulze, M.; Seitz, J.] Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. [Caporaso, G. J.; Chen, Y. -J.] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. [Logan, G.; Bieniosek, F.] Lawrence Livermore Natl Lab, Livermore, CA 94720 USA. RP Scarpetti, RD (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. EM Scarpetti_r@lanl.gov FU USDOE [DE-AC52-06NA25396] FX Work supported by USDOE under contract DE-AC52-06NA25396. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3600 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304134 ER PT B AU Kirk, HG AF Kirk, H. G. GP IEEE TI Advances in high-power targets SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE ID CAVITATION AB High-power targets are a major issue for both neutron sources and neutrino factories. This paper reviews the status of international studies. The targetry R&D program required to realize high-power targets is described. C1 BNL, Upton, NY 11973 USA. RP Kirk, HG (reprint author), BNL, Upton, NY 11973 USA. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3615 EP 3619 PG 5 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304137 ER PT B AU Kim, KJ AF Kim, K. -J. GP IEEE TI Transverse-transverse and transverse-longitudinal phase-space converters for enhanced beam applications SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Emittance exchange and flat beam transform are two phase-space converting techniques being developed recently to enhance the performance of electron beams for various applications. We review these applications, the basic principles of the converters, and the status of experimental demonstration of these techniques. C1 ANL, Argonne, IL 60439 USA. RP Kim, KJ (reprint author), ANL, Argonne, IL 60439 USA. NR 32 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3630 EP 3634 PG 5 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304140 ER PT B AU Chao, YC AF Chao, Yu-Chiu GP IEEE TI Generation and control of high precision beams at lepton accelerators SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Parity violation experiments require precision manipulation of helicity-correlated beam coordinates on target at the nm/nrad-level. Achieving this unprecedented level of control requires a detailed understanding of the particle optics and careful tuning of the beam transport to keep anomalies from compromising the design adiabatic damping. Such efforts are often hindered by machine configuration and instrumentation limitations at the low energy end. A technique has been developed at CEBAF including high precision measurements, Mathematica-based analysis for obtaining corrective solutions, and control hardware/software developments for realizing such level of control at energies up to 5 GeV. C1 TJNAF, Newport News, VA 23606 USA. RP Chao, YC (reprint author), TJNAF, Newport News, VA 23606 USA. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3635 EP 3639 PG 5 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304141 ER PT B AU Waldron, WL Reginato, LL Henestroza, E Friedman, A Briggs, RJ AF Waldron, W. L. Reginato, L. L. Henestroza, E. Friedman, A. Briggs, R. J. GP IEEE TI Studies of the Pulse Like Ion Accelerator SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The Pulse Line Ion Accelerator concept was motivated by the need for an inexpensive way to accelerate intense short pulse heavy ion beams to regimes of interest for studies of High Energy Density Physics and Warm Dense Matter. A pulse power driver applied to one end of a helical pulse line creates a traveling wave that accelerates and axially confines the heavy ion beam pulse. The concept has been demonstrated with ion beams at modest acceleration gradients. Acceleration scenarios with constant parameter helical lines are described which result in output energies of a single stage much larger than the several hundred kilovolt peak voltages on the line, with a goal of 3-5 MeV/m acceleration gradients. This method has the potential to reduce the length of an equivalent induction accelerator by a factor of 6-10 while simplifying the pulsed power systems. The performance of prototype hardware has been limited by high voltage partial discharges across the vacuum insulator. Bench tests and analysis have led to significantly improved discharge thresholds. Further studies using a variety of experimental configurations are planned. C1 [Waldron, W. L.; Reginato, L. L.; Henestroza, E.] LBNL, Berkeley, CA 94550 USA. [Friedman, A.] LLNL, Livermore, CA USA. [Briggs, R. J.] SAIC, Alamo, CA USA. RP Waldron, WL (reprint author), LBNL, Berkeley, CA 94550 USA. FU U. S. DOE by the University of California; LBNL [DE-AC02-05CH11231]; LLNL [W-7405-Eng-48] FX Work performed under the auspices of the U. S. DOE by the University of California, LBNL Contract # DE-AC02-05CH11231 and LLNL Contract # W-7405-Eng-48. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3640 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304142 ER PT B AU Caporaso, GJ Sampayan, S Chen, YJ Blackfield, D Harris, J Hawkins, S Holmes, C Krogh, M Nelson, S Nunnally, W Paul, A Poole, B Rhodes, M Sanders, D Selenes, K Sullivan, J Wang, L Watson, J AF Caporaso, George J. Sampayan, S. Chen, Y-J. Blackfield, D. Harris, J. Hawkins, S. Holmes, C. Krogh, M. Nelson, S. Nunnally, W. Paul, A. Poole, B. Rhodes, M. Sanders, D. Selenes, K. Sullivan, J. Wang, L. Watson, J. GP IEEE TI High gradient induction accelerator SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB A new type of compact induction accelerator is under development at the Lawrence Livermore National Laboratory that promises to increase the average accelerating gradient by at least an order of magnitude over that of existing induction machines. The machine is based on the use of high gradient vacuum insulators, advanced dielectric materials and switches and is stimulated by the desire for compact flash x-ray radiography sources. Research describing an extreme variant of this technology aimed at proton therapy for cancer will be described. Progress in applying this technology to several applications will be reviewed. C1 [Caporaso, George J.; Sampayan, S.; Chen, Y-J.; Blackfield, D.; Harris, J.; Hawkins, S.; Holmes, C.; Nelson, S.; Paul, A.; Poole, B.; Rhodes, M.; Sanders, D.; Sullivan, J.; Wang, L.; Watson, J.] Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. [Krogh, M.] Univ Missouri, Columbia, MS 67890 USA. [Nunnally, W.] Univ Missouri, Columbia, MS 65211 USA. [Selenes, K.] TPL Corp, Albuquerque, NM 87109 USA. RP Caporaso, GJ (reprint author), Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. EM caporasol@llnl.gov NR 9 TC 1 Z9 2 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3645 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304143 ER PT B AU Nash, B AF Nash, B. GP IEEE TI Equilibrium beam distribution in electron storage rings near synchrobetatron coupling resonances SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE ID SYNCHROTRON AB Based on the work [1], [2], we discuss the topic of finding the equilibrium beam distribution near synchrobetatron coupling resonances. We show how this framework reduces to the Sands results in the uncoupled case. A variety of damping/diffusion effects can be included. We discuss the case of IBS damping diffusion in detail, showing how it can be combined with our analytical treatment of emittance evolution. For the synchrobetatron coupled case, this formalism has been applied in detail to the case of dispersion at RF cavities and crab cavities. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Nash, B (reprint author), Brookhaven Natl Lab, Upton, NY 11973 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3658 EP 3662 PG 5 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304146 ER PT B AU Huang, X Lee, SY Ng, KY AF Huang, X. Lee, S. Y. Ng, K. Y. GP IEEE TI Emittance measurement and modeling for the Fermilab Booster SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB We systematically measured the emittance evolution of a fast cycling proton accelerator on a tum-by-turn basis under various beam intensities via an ionization profile monitor (IPM). The vertical emittance growth rate was derived and phenomenologically analyzed. The transverse and longitudinal components in the horizontal beam size were separated by making use of their different evolution behaviors. The quadrupole mode beam size oscillation after transition crossing is also studied and explained. We found a considerable space-charge-induced emittance growth rate component in the vertical plane but not as much for the horizontal plane. We carried out multiparticle simulations to understand the mechanism of space-charge-induced emittance growth. The major sources of emittance growth were found to be the random skew-quadrupole and dipole field errors in the presence of large space-charge tune spread. C1 [Huang, X.; Lee, S. Y.] Indiana Univ, Bloomington, IN 47405 USA. [Ng, K. Y.] Fermi Lab, Batavia, IL 60510 USA. RP Huang, X (reprint author), SLAC, Menlo Pk, CA 94025 USA. EM xiahuang@slac.stanford.edu FU US Department of Energy [DE-AC02-76CH03000, DE-FG0292ER40747]; National Science Foundation NSF [PHY-0552389] FX This work was supported in part by grants from the US Department of Energy, under contract DE-AC02-76CH03000, and DE-FG0292ER40747 and the National Science Foundation NSF PHY-0552389. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3668 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304148 ER PT B AU Carwardine, J Arnold, N Lenkszus, F Saunders, C Rehlich, K Simrock, S Banerjee, B Chase, B Gottschalk, E Joireman, P Kasley, P Lackey, S McBride, P Pavlicek, V Patrick, J Votava, M Wolbers, S Furukawa, K Michizono, S Larsen, RS Downing, R AF Carwardine, J. Arnold, N. Lenkszus, F. Saunders, C. Rehlich, K. Simrock, S. Banerjee, B. Chase, B. Gottschalk, E. Joireman, P. Kasley, P. Lackey, S. McBride, P. Pavlicek, V. Patrick, J. Votava, M. Wolbers, S. Furukawa, K. Michizono, S. Larsen, R. S. Downing, R. GP IEEE TI The ILC global control system SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The scale and performance parameters of the ILC require new thinking in regards to control system design. This design work has begun quite early in comparison to most accelerator projects, with the goal of uniquely high overall accelerator availability. Among the design challenges are high control system availability, precision timing and rf phase reference distribution, standardizing of interfaces, operability, and maintainability. We present the current state of the design and take a prospective look at ongoing research and development projects. C1 [Carwardine, J.; Arnold, N.; Lenkszus, F.; Saunders, C.] Argonne, Aachen, Germany. [Rehlich, K.; Simrock, S.] DESY, Hamburg, Germany. [Banerjee, B.; Chase, B.; Gottschalk, E.; Joireman, P.; Kasley, P.; Lackey, S.; McBride, P.; Pavlicek, V.; Patrick, J.; Votava, M.; Wolbers, S.] Fermilab Natl Accelerator Lab, Batavia, IL USA. [Furukawa, K.; Michizono, S.] KEK, Ibaraki, Japan. [Larsen, R. S.; Downing, R.] SLAC, Menlo Pk, CA USA. RP Carwardine, J (reprint author), Argonne, Aachen, Germany. FU US Department of Energy [DE-AC02-76CH03000, DE-FG0292ER40747]; National Science Foundation NSF [PHY-0552389] FX This work was supported in part by grants from the US Department of Energy, under contract DE-AC02-76CH03000, and DE-FG0292ER40747 and the National Science Foundation NSF PHY-0552389. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3673 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304149 ER PT B AU Fedotov, AV AF Fedotov, A. V. GP IEEE TI RHIC plans towards higher luminosity SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The Relativistic Heavy Ion Collider (RHIC) is designed to provide luminosity over a wide range of beam energies and species, including heavy ions, polarized protons, and asymmetric beam collisions. In the first seven years of operation there has been a rapid increase in the achieved peak and average luminosity, substantially exceeding design values. Work is presently underway to achieve the Enhanced Design parameters. Planned major upgrades include the Electron Beam Ion Source (EBIS), RHIC-II, and construction of an electron-ion collider (eRHIC). We review the expected RHIC upgrade performance. Electron cooling and its impact on the luminosity both for heavy ions and protons are discussed in detail. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Fedotov, AV (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. EM fedotov@bnl.gov 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3688 EP 3692 PG 5 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304152 ER PT B AU Gilson, EP Chung, M Davidson, RC Dorf, M Efthimion, PC Majeski, R Startsev, EA AF Gilson, E. P. Chung, M. Davidson, R. C. Dorf, M. Efthimion, P. C. Majeski, R. Startsev, E. A. GP IEEE TI Experiments on transverse bunch compression on the princeton paul trap simulator experiment SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE ID BEAM-PROPAGATION; EXPERIMENT PTSX; INSTABILITY AB The Paul Trap Simulator Experiment is a compact laboratory Paul trap that simulates a long, thin charged-particle bunch coasting through a kilometers-long magnetic alternating-gradient (AG) transport system by putting the physicist in the beam's frame-of-reference. The transverse dynamics of particles in both systems are described by the same sets of equations, including all nonlinear space-charge effects. The time-dependent quadrupolar electric fields created by the confinement electrodes of a linear Paul trap correspond to the axially-dependent magnetic fields applied in the AG system. Results are presented from experiments in which the lattice period is changed over the course of the experiment to transversely compress a beam with an initial depressed-tune of 0.9. Instantaneous and smooth changes are considered. Emphasis is placed on determining the conditions that minimize the emittance growth and the number of halo particles produced after the beam compression. Envelope equation solutions agree well with the experimental data. C1 [Gilson, E. P.; Chung, M.; Davidson, R. C.; Dorf, M.; Efthimion, P. C.; Majeski, R.; Startsev, E. A.] Princeton Univ, Plasma Phys Lab, Princeton, NJ 08543 USA. RP Gilson, EP (reprint author), Princeton Univ, Plasma Phys Lab, POB 451, Princeton, NJ 08543 USA. EM egilson@pppl.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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3698 EP 3702 PG 5 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304154 ER PT B AU Li, Z Akcelik, V Candel, A Chen, S Ge, L Kabel, A Lee, LQ Ng, C Prudencio, E Schussman, G Uplenchwar, R Xiao, L Ko, K AF Li, Z. Akcelik, V. Candel, A. Chen, S. Ge, L. Kabel, A. Lee, L. -Q. Ng, C. Prudencio, E. Schussman, G. Uplenchwar, R. Xiao, L. Ko, K. GP IEEE TI Towards smulation of electromagnetics and beam physics at the petascale SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Under the support of the U.S. DOE SciDAC program, SLAC has been developing a suite of 3D parallel finite-element codes aimed at high-accuracy, high-fidelity electromagnetic and beam physics simulations for the design and optimization of next-generation particle accelerators. Running on the latest supercomputers, these codes have made great strides in advancing the state of the art in applied math and computer science at the petascale that enable the integrated modeling of electromagnetics, self-consistent Particle-In-Cell (PIC) particle dynamics as well as thermal, mechanical, and multi-physics effects. This paper will present 3D results of trapped mode calculations in an ILC cryomodule and the modeling of the ILC Sheet Beam klystron, shape determination of superconducting RF (SCRF) cavities and multipacting studies of SCRF HOM couplers, as well as PIC simulation results of the LCLS RF gun. C1 [Li, Z.; Akcelik, V.; Candel, A.; Chen, S.; Ge, L.; Kabel, A.; Lee, L. -Q.; Ng, C.; Prudencio, E.; Schussman, G.; Uplenchwar, R.; Xiao, L.; Ko, K.] SLAC, Menlo Pk, CA 94025 USA. RP Li, Z (reprint author), SLAC, Menlo Pk, CA 94025 USA. EM lizh@slac.stanford.edu NR 17 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3713 EP 3717 PG 5 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304157 ER PT B AU Amundson, JF Spentzouris, P Qiang, J Ryne, RD Dechow, DR AF Amundson, James F. Spentzouris, Panagiotis Qiang, Ji Ryne, Robert D. Dechow, Douglas R. GP IEEE TI Scidac frameworks and solvers for multi-physics beam dynamics simulations SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The need for realistic accelerator simulations is greater than ever before due to the needs of design projects such as the ILC and optimization for existing machines. Sophisticated codes utilizing large-scale parallel computing have been developed to study collective beam effects such as space charge, electron cloud, beam-beam, etc. We will describe recent advances in the solvers for these effects and plans for enhancing them in the future. To date the codes have typically applied to a single collective effect and included just enough of the single-particle dynamics to support the collective effect at hand. We describe how we are developing a framework for realistic multi-physics simulations, i.e., simulations including the state-of-the-art calculations of all relevant physical processes. C1 [Amundson, James F.; Spentzouris, Panagiotis] Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. [Qiang, Ji; Ryne, Robert D.] LBNL, Berkeley, CA 94720 USA. [Dechow, Douglas R.] Tech X, Boulder, CO 80303 USA. RP Amundson, JF (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM amundson@fnal.gov FU U.S. Department of Energy SciDAC program FX Work supported by the U.S. Department of Energy SciDAC program. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3718 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304158 ER PT B AU Bassi, G Ellison, JA Heinemann, K Venturini, M Warnock, R AF Bassi, G. Ellison, J. A. Heinemann, K. Venturini, M. Warnock, R. GP IEEE TI Self-consistent computation of electromagnetic fields and phase space densities for particles on curved planar orbits SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE ID EQUATION AB We discuss our progress on the self-consistent calculation of the 4D phase space density (PSD) and electromagnetic fields in a Vlasov-Maxwell formulation. We emphasize Coherent Synchrotron Radiation (CSR) from arbitrary curved planar orbits, with shielding from the vacuum chamber, but space charge forces are naturally included. Our focus on the Vlasov equation will provide simulations with lower numerical/statistical noise than standard PIC methods, and will allow the study of issues such as emittance degradation and microbunching due to space charge and CSR in bunch compressors. The fields excited by the bunch are computed in the lab frame from a new double integral formula. The field formula is derived from retarded potentials by changes of variables. It is singularity-free and requires no computation of retarded times. Ultimately, the Vlasov equation will be integrated in beam frame coordinates using our method of local characteristics. As an important intermediate step, we have developed a "self-consistent Monte Carlo algorithm", and a corresponding parallel code. This gives an accurate representation of the source and will help in understanding the PSD support. In addition we have (1) studied carefully a 2D phase space Vlasov analogue and (2) derived an improved expression of the field of a I D charge/current distribution which accounts for the interference of different bends and other effects usually neglected. Bunch compressors will be emphasized. C1 [Ellison, J. A.; Heinemann, K.] Univ New Mexico, Albuquerque, NM 87131 USA. [Bassi, G.] Univ Liverpool, Liverpool L69 3BX, Merseyside, England. [Venturini, M.; Warnock, R.] SLAC, Menlo Pk, CA USA. RP Ellison, JA (reprint author), Univ New Mexico, Albuquerque, NM 87131 USA. FU DOE [DE-FG02-99ER41104, DEAC02-76SF00515] FX Work supported by DOE grants DE-FG02-99ER41104 and DEAC02-76SF00515. NR 14 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3723 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304159 ER PT B AU Kourbanis, I AF Kourbanis, I. GP IEEE TI Present and future high-energy accelerators for neutrino experiments SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB There is an active neutrino program making use of the high-energy (larger than 50 GeV) accelerators both in USA at Fermilab with NuMI and at CERN in Europe with CNGS. In this paper we will review the prospects for high intensity high energy beams in those two locations during the next decade. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Kourbanis, I (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM ioanis@fnal.gov 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3728 EP 3732 PG 5 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304160 ER PT B AU Seletskiy, S Tenenbaum, P AF Seletskiy, S. Tenenbaum, P. GP IEEE TI The optimized bunch compressor for the international linear collider SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The International Linear Collider (ILC) utilizes a two stage Bunch Compressor (BC) that compresses the RMS bunch length from 9 mm to 200 to 300 micrometers before sending the electron beam to the Main Linac. This paper reports on the new design of the optimized BC wiggler. It was reduced in length by more than 30 %. The introduction of nonzero dispersion slope in the BC wigglers enabled them to generate the required compression while having a small SR emittance growth, a tunability range of over a factor of 2 in each wiggler, and less than 3 % RMS energy spread throughout the entire system. C1 [Seletskiy, S.; Tenenbaum, P.] Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94025 USA. RP Seletskiy, S (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94025 USA. EM seletski@slac.stanford.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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3736 EP 3738 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304162 ER PT B AU Pivi, M Collet, G King, F Kirby, R Markiewicz, T Raubenheimer, T Seeman, J Wang, L Le Pimpec, F AF Pivi, M. Collet, G. King, F. Kirby, R. Markiewicz, T. Raubenheimer, T. Seeman, J. Wang, L. Le Pimpec, F. GP IEEE TI Secondary electron yield and groove chamber tests in PEP-II SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE ID EMISSION; SURFACES AB Possible remedies for the electron cloud in positron damping ring (DR) of the international Linear Collider (ILC) includes thin-film coatings, surface conditioning, photon antechamber, clearing electrodes and chamber with grooves or slots [1]. We installed chambers in the PEP-II Low Energy Ring (LER) to monitor the secondary electron yield (SEY) of TiN, TiZrV (NEG) and technical accelerator materials under the effect of electron and photon conditioning in situ. We have also installed chambers with rectangular grooves in straight sections to test this possible mitigation technique. In this paper, we describe the ILC R&D ongoing effort at SLAC to reduce the electron cloud effect in the damping ring, the chambers installation in the PEP-II and latest results. C1 [Pivi, M.; Collet, G.; King, F.; Kirby, R.; Markiewicz, T.; Raubenheimer, T.; Seeman, J.; Wang, L.] SLAC, Menlo Pk, CA 94025 USA. [Le Pimpec, F.] PSI, Villigen, Switzerland. RP Pivi, M (reprint author), SLAC, Menlo Pk, CA 94025 USA. EM mpivi@slac.stanford.edu FU Office of Science, High Energy Physics, U.S. DOE [DE-AC02-76SF00515] FX Work supported by the Director, Office of Science, High Energy Physics, U.S. DOE under Contract No. DE-AC02-76SF00515. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3739 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304163 ER PT B AU Podobedov, B Zagorodnov, I AF Podobedov, Boris Zagorodnov, Igor GP IEEE TI Impedance minimization by nonlinear tapering SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB There exist analytical approximations that express the transverse geometric impedance of tapered transitions in the inductive regime as a functional of the transition boundary and its derivatives. Assuming the initial and final cross-sections and the transition length are fixed, one can minimize these functionals by appropriate choice of the boundary variation with the longitudinal coordinate. In this paper we numerically investigate how well this works for the cases of optimized tapered transitions in circular, elliptical and rectangular geometry by running ABCI, ECHO, and GdfidL EM field solvers. We show that a substantial reduction of impedance for optimized boundary compared to that of a linear taper is indeed possible in some cases, and then we compare this reduction to analytical predictions. C1 [Podobedov, Boris] BNL, NSLS, Upton, NY USA. [Zagorodnov, Igor] DESY, Hamburg, Germany. RP Podobedov, B (reprint author), BNL, NSLS, Upton, NY USA. FU DOE [DE-AC02-98CH10886]; EU [011935 EUROFEL] FX Work supported by DOE contract number DE-AC02-98CH10886. &Work supported by EU contract 011935 EUROFEL. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3748 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304166 ER PT B AU Thompson, MC Badakov, H Rosenzweig, JB Travish, G Fliller, R Kazakevich, GM Piot, P Santucci, J Li, J Tikhoplav, R AF Thompson, M. C. Badakov, H. Rosenzweig, J. B. Travish, G. Fliller, R. Kazakevich, G. M. Piot, P. Santucci, J. Li, J. Tikhoplav, R. GP IEEE TI Observations of underdense plasma lens focusing of relativistic electron beams SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Focusing of a 15 McV, 19 nC electron bunch by an underdense plasma lens operated just beyond the threshold of the underdense condition has been demonstrated in experiments at the Fermilab NICADD Photoinjector Laboratory (FNPL). The strong 1.9 cm focal-length plasma-lens focused both transverse directions simultaneously and reduced the minimum area of the beam spot by a factor of 23. Analysis of the beam-envelope evolution observed near the beam waist shows that the spherical aberrations of this underdense lens are lower than those of an overdense plasma lens,, as predicted by theory. Correlations between the beam charge and the properties of the beam focus corroborate this conclusion. C1 [Thompson, M. C.; Badakov, H.; Rosenzweig, J. B.; Travish, G.] Univ Calif Los Angeles, Los Angeles, CA 90095 USA. [Fliller, R.; Kazakevich, G. M.; Piot, P.; Santucci, J.] Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. [Li, J.; Tikhoplav, R.] Univ Rochester, 601 Elmwood Ave, Rochester, NY 14627 USA. RP Thompson, MC (reprint author), Univ Calif Los Angeles, Los Angeles, CA 90095 USA. EM dr.mcthompson@gmail.com FU U.S. Dept. of Energy [DE-FG03-92ER40693, W-7405-ENG-48] FX Work supported by U.S. Dept. of Energy Contracts No. DE-FG03- 92ER40693 and W-7405-ENG-48. NR 15 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3754 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304168 ER PT B AU Burrows, PN Christian, G Clarke, C Constance, B Khah, HD Hartin, T Perry, C Swinson, C Kalinin, A Arnold, R Molloy, S Smith, S White, GR Woods, M AF Burrows, P. N. Christian, G. Clarke, C. Constance, B. Khah, H. Dabiri Hartin, T. Perry, C. Swinson, C. Kalinin, A. Arnold, R. Molloy, S. Smith, S. White, G. R. Woods, M. GP IEEE TI Electromagnetic background tests for the ILC interaction-point feedback system SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB We present results obtained with the T-488 experiment at SLAC Endstation A (ESA). A material model of the ILC extraction-fine design was assembled and installed in ESA. The module includes materials representing the mask, beamline calorimeter, and first extraction quadrupole, encompassing a stripline interaction-point feedback system beam position monitor (BPM). The SLAC high-energy electron beam was used to irradiate the module in order to mimic the electromagnetic (EM) backgrounds expected in the ILC interaction region. The impact upon the performance of the feedback BPM was measured, and compared with detailed simulations of its expected response. C1 [Burrows, P. N.; Christian, G.; Clarke, C.; Constance, B.; Khah, H. Dabiri; Hartin, T.; Perry, C.; Swinson, C.] Univ Oxford, John Adams Inst, S Parks Rd, Oxford, England. [Kalinin, A.] Daresbury Lab, Oxford, England. [Arnold, R.; Molloy, S.; Smith, S.; White, G. R.; Woods, M.] SLAC, Menlo Pk, CA 94025 USA. RP Burrows, PN (reprint author), Univ Oxford, John Adams Inst, S Parks Rd, Oxford, England. RI swinson, christina/C-6782-2012 FU Commission of the European Communities under the 6th Framework Programme [RIDS-011899]; UK Science and Technology Facilities Council FX This work is supported by the Commission of the European Communities under the 6th Framework Programme "Structuring the European Research Area", contract number RIDS-011899, and by the UK Science and Technology Facilities Council. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3757 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304169 ER PT B AU Wang, S Brumwell, RR Dooling, JC Harkay, KC Kustom, R McMichael, G Middendorf, ME Nassiri, A AF Wang, S. Brumwell, R. R. Dooling, J. C. Harkay, K. C. Kustom, R. McMichael, G. Middendorf, M. E. Nassiri, A. GP IEEE TI Vertical instability at IPNS RCS SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The Rapid Cycling Synchrotron (RCS) of the Intense Pulsed Neutron Source (IPNS) at ANL accelerates > 3.0 x 10(12) protons from 50 MeV to 450 MeV with 30-Hz repetition frequency. During the acceleration cycle, the rf frequency varies from 2.21 MHz to 5.14 MHz. Presently, the beam current is limited by a vertical instability. By analyzing turn-by-turn beam position monitor (BPM) data, large-amplitude mode 0 and mode 1 vertical beam centroid oscillations were observed in the later part of the acceleration cycle. The oscillations start in the tail of the bunch, build up, and remain localized in the tail half of the bunch. This vertical instability was compared with a head-tail instability that was intentionally induced in the RCS by adjusting the trim sextupoles. It appears that our vertical instability is not a classical head-tail instability [1]. More data analysis and experiments were performed to characterize the instability. C1 [Wang, S.; Brumwell, R. R.; Dooling, J. C.; Harkay, K. C.; Kustom, R.; McMichael, G.; Middendorf, M. E.; Nassiri, A.] Argonne Natl Lab, Argonne, IL 60439 USA. RP Wang, S (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. EM wangshaoheng@anl.gov 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3764 EP 3766 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304171 ER PT B AU Geddes, CGR Cormier-Michel, E Esarey, E Leemans, WP Nakamura, K Panasenko, D Plateau, GR Schroeder, CB Toth, C Cary, JR AF Geddes, C. G. R. Cormier-Michel, E. Esarey, E. Leemans, W. P. Nakamura, K. Panasenko, D. Plateau, G. R. Schroeder, C. B. Toth, Cs. Cary, J. R. GP IEEE TI Stable electron beams with low absolute energy spread from a laser wakefield accelerator with plasma density ramp controlled injection SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE ID PULSES AB Laser wakefield accelerators produce accelerating gradients up to hundreds of GeV/m, and recently demonstrated 1-10 MeV energy spread at energies up to 1 GeV using electrons self-trapped from the plasma. Controlled injection and staging may further improve beam quality by circumventing tradeoffs between energy, stability, and energy spread/emittance. We present experiments demonstrating production of a stable electron beam near 1 MeV with hundred-keV level energy spread and central energy stability by using the plasma density profile to control self-injection, and supporting simulations. Simulations indicate that such beams can be post accelerated to high energies, potentially reducing momentum spread in laser accelerators by 100-fold or more. C1 [Geddes, C. G. R.; Cormier-Michel, E.; Esarey, E.; Leemans, W. P.; Nakamura, K.; Panasenko, D.; Plateau, G. R.; Schroeder, C. B.; Toth, Cs.] Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. [Cary, J. R.] Tech X Corp, Boulder, CO 80303 USA. RP Geddes, CGR (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. EM cggeddes@lbl.gov FU U.S. Dept. of Energy [DE-AC02-05CH11231, DE-FG03-95ER40926] FX Work supported by the U.S. Dept. of Energy contracts DE-AC02-05CH11231, DE-FG03-95ER40926, DE-FG02-01ER41178, DE-FG 02-03ER83857, DOE SciDAC, INCITE, and NERSC programs, and NSF grant 0113907 and 0614001. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3767 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304172 ER PT B AU Ni, PA Bieniosek, FM Leitner, M Logan, BG More, RM Roy, PK Hoffmann, DHH Fernengel, D Hug, A Menzel, J Udrea, S Tahir, NA Varentsov, D Wahl, H Kulish, M Nikolaev, DN Ternovoi, VY Fertman, A Golubev, AA Sharkov, BY Turtikov, V Barnard, JJ AF Ni, P. A. Bieniosek, F. M. Leitner, M. Logan, B. G. More, R. M. Roy, P. K. Hoffmann, D. H. H. Fernengel, D. Hug, A. Menzel, J. Udrea, S. Tahir, N. A. Varentsov, D. Wahl, H. Kulish, M. Nikolaev, D. N. Ternovoi, V. Ya. Fertman, A. Golubev, A. A. Sharkov, B. Yu. Turtikov, V. Barnard, J. J. GP IEEE TI Overwew of warm-dense-matter experiments with intense heavy ion beams at GSI-Darmstadt SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE ID FACILITY C1 [Ni, P. A.; Bieniosek, F. M.; Leitner, M.; Logan, B. G.; More, R. M.; Roy, P. K.] LBNL, Berkeley, CA USA. [Hoffmann, D. H. H.; Fernengel, D.; Hug, A.; Menzel, J.; Udrea, S.] Tech Univ Darmstadt, Darmstadt, Germany. [Kulish, M.; Nikolaev, D. N.; Ternovoi, V. Ya.] IPCP, Chernogolovka, Russia. [Fertman, A.; Golubev, A. A.; Sharkov, B. Yu.; Turtikov, V.] ITEP, Moscow, Russia. [Barnard, J. J.] LLNL, Livermore, CA USA. RP Ni, PA (reprint author), LBNL, Berkeley, CA USA. EM pani@lbl.gov; hoffmann@physik.tu-darmstadt.de FU GSI-INTAS [03-54-4254]; ISTC [2107]; PRAS; BMBF; U.S. Dept. of Energy by LBNL; LLNL; PPPL [W-7405-Eng-48, DE-AC02-05CH11231, DE-AC02-76CH3073] FX The work was supported by GSI-INTAS (03-54-4254), ISTC (2107), PRAS (09-2006), BMBF and performed under the auspices of the U.S. Dept. of Energy by LBNL, LLNL, and PPPL under Contracts No. W- 7405-Eng-48, DE-AC02-05CH11231, and DE-AC02-76CH3073. NR 10 TC 0 Z9 0 U1 0 U2 3 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3782 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304177 ER PT B AU Chang, XY Ben-Zvi, L Burrill, A Grimes, J Rao, T Segalov, Z Smedley, J Wu, Q AF Chang, Xiangyun Ben-Zvi, L. Burrill, A. Grimes, J. Rao, T. Segalov, Z. Smedley, J. Wu, Qiong GP IEEE TI Recent progress on the diamond amplified photo-cathode experiment SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB We report recent progress on the Diamond Amplified Photo-cathode (DAP). The use of a pulsed electron gun provides detailed information about the DAP physics. The secondary electron gain has been measured under various electric fields. We have achieved gains of a few hundred in the transmission mode and observed evidence of emission of electrons from the surface. A model based on recombination of electrons and holes during generation well describes the field dependence of the gain. The emittance measurement system for the DAP has been designed, constructed and is ready for use. The capsule design of the DAP is also being studied in parallel. C1 [Chang, Xiangyun; Ben-Zvi, L.; Burrill, A.; Grimes, J.; Rao, T.; Segalov, Z.; Smedley, J.] Brookhaven Natl Lab, Upton, NY 11973 USA. [Wu, Qiong] Indiana Univ, Bloomington, IN 47405 USA. RP Chang, XY (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. FU U.S. Department of Energy, and the Office of Naval Research FX Work supported by the U.S. Department of Energy, and the Office of Naval Research. NR 6 TC 0 Z9 1 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3788 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304179 ER PT B AU Bogacz, A Brindza, P Bruell, A Cardman, L Delayen, J Derbenev, Y Ent, R Evtushenko, P Grames, J Hutton, A Krafft, G Li, R Merminga, L Musson, J Poelker, M Thomas, A Wojtsekhowski, B Yunn, B Zhang, Y Fischer, W Montag, C Ostroumov, P Dudnikov, V Derenchuk, V AF Bogacz, A. Brindza, P. Bruell, A. Cardman, L. Delayen, J. Derbenev, Y. Ent, R. Evtushenko, P. Grames, J. Hutton, A. Krafft, G. Li, R. Merminga, L. Musson, J. Poelker, M. Thomas, A. Wojtsekhowski, B. Yunn, B. Zhang, Y. Fischer, W. Montag, C. Ostroumov, P. Dudnikov, V. Derenchuk, V. GP IEEE TI Design studies of high-luminoisty ring-ring electron-ion collider at CEBAF SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Experimental studies of fundamental structure of nucleons require an electron-ion collider of a center-of-mass energy up to 90 GeV at luminosity up to 10(35) cm(-2) s(-1) with both beams polarized. A CEBAF-based collider of 9 GeV electrons/positrons and 225 GeV ions is envisioned to meet this science need and as a next step for CEBAF after the planned 12 GeV energy upgrade of the fixed target program. A ring-ring scheme of this collider developed recently takes advantage of the existing polarized electron CW beam from the CEBAF and a green-field design of an ion complex with electron cooling. We present a conceptual design and report design studies of this high-luminosity collider. C1 [Bogacz, A.; Brindza, P.; Bruell, A.; Cardman, L.; Delayen, J.; Derbenev, Y.; Ent, R.; Evtushenko, P.; Grames, J.; Hutton, A.; Krafft, G.; Li, R.; Merminga, L.; Musson, J.; Poelker, M.; Thomas, A.; Wojtsekhowski, B.; Yunn, B.; Zhang, Y.] Jefferson Lab, Newport News, VA 23606 USA. [Fischer, W.; Montag, C.] Brookhaven Natl Lab, Upton, NY 11973 USA. [Ostroumov, P.] Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. [Dudnikov, V.] BTG, Setauket 11733, NY USA. [Derenchuk, V.] Indiana Univ, Cyclotron Facil, Bloomington, IN 47408 USA. RP Bogacz, A (reprint author), Jefferson Lab, Newport News, VA 23606 USA. FU LLC under U.S. DOE [DE-AC05-06OR23177] FX Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177. The U.S. Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce this man uscript for U.S. Government purposes 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3794 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304181 ER PT B AU Mae, CM Chase, BE Gattuso, C Joireman, PW AF Mae, C. M. Chase, B. E. Gattuso, C. Joireman, P. W. GP IEEE TI Longitudinal momentum mining of antiprotons at the fermilab recycler: Past, present and future SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The technique of longitudinal momentum mining (LMM)[1] in the Fermilab Recycler was adopted in early 2005 to extract thirty-six equal intensity and equal 6D-emittance antiproton bunches for proton-antiproton collider operation in the Tevatron. Since that time, several improvements have been made in the Recycler and the.. g technique to handle higher intensity beams. Consequently, the Recycler has become a key contributor to the increased luminosity performance observed during Tevatron Run IIb. In this paper, we present an overview of the improvements and the current status of the momentum mining technique. C1 [Mae, C. M.; Chase, B. E.; Gattuso, C.; Joireman, P. W.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Mae, CM (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM cbhat@fnal.gov; chase@fnal.gov 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3800 EP 3802 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304183 ER PT B AU Sertore, D Fusetti, M Michelato, P Pagani, C Higo, T Hong, J Saito, K Ciovati, G Rothgeb, T AF Sertore, D. Fusetti, M. Michelato, P. Pagani, C. Higo, T. Hong, J. Saito, K. Ciovati, G. Rothgeb, T. GP IEEE TI High pressure rinsing system comparison SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB High pressure rinsing (HPR) is a key process for the surface preparation of high field superconducting cavities. A portable apparatus for the water jet characterization, based on the transferred momentum between the water jet and a load cell, has been used in different laboratories. This apparatus allows collecting quantitative parameters that characterize the HPR water jet. In this paper, we present a quantitative comparison of the different water jets produced by various nozzles routinely used in different laboratories for the HPR process. C1 [Sertore, D.; Fusetti, M.; Michelato, P.; Pagani, C.] LASA, Ist Nazl Fis Nucl, Segrate, MI, Italy. [Higo, T.; Hong, J.; Saito, K.] KEK, Tsukuba, Ibaraki, Japan. [Ciovati, G.; Rothgeb, T.] JLAB, Newport News, VA USA. RP Sertore, D (reprint author), LASA, Ist Nazl Fis Nucl, Segrate, MI, Italy. EM Daniele.Sertore@mi.infn.it NR 6 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3848 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304199 ER PT B AU Yakovlev, V Avrakhov, P Kanareykin, A Kazakov, S Solyak, N AF Yakovlev, V. Avrakhov, P. Kanareykin, A. Kazakov, S. Solyak, N. GP IEEE TI Progress towards development of a superconducting traveling wave accelerating structure SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB In the ILC project the required accelerating gradient is higher than 30 MeV/m. For current technology the maximum acceleration gradient in SC structures is determined mainly by the value of the surface RF magnetic field. In order to increase the gradient, the RF magnetic field is distributed homogeneously over the cavity surface (lw-loss structure), and coupling to the beam is improved by introducing aperture "noses" (re-entrant structure). These features allow gradients in excess of 50 MeV/m to be obtained for a singe-cell cavity. Further improvement of the coupling to the beam may be achieved by using a TW SC structure with small phase advance per cell. We have demonstrated that an additional gradient increase by up to 46% may be possible if a pi/2 TW SC structure is employed. However, a TW SC structure requires a SC feedback waveguide to return the few GW of circulating RF power from the structure output back to the structure input. The test cavity with the feedback is designed to demonstrate the possibility of achieving a significantly higher gradient than existing SC structures. C1 [Yakovlev, V.] Yale Univ, Dept Phys, Omega P Inc, New Haven, CT 06511 USA. [Avrakhov, P.; Kanareykin, A.] Euclid Techlabs LLC, Rockville, MD 20850 USA. [Kazakov, S.] KEK, Tsukuba, Ibaraki, Japan. [Solyak, N.] Fermi Natl Lab, Batavia, IL 60510 USA. RP Yakovlev, V (reprint author), Yale Univ, Dept Phys, Omega P Inc, New Haven, CT 06511 USA. EM alexkan@euclidtechlabs.com FU US Department of Energy FX Work supported by US Department of Energy. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3938 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304229 ER PT B AU Dobert, S Fandos, R Grudiev, A Heikkinen, S Rodriquez, JA Taborelli, M Wuensch, W Adolphsen, C Laurent, L AF Doebert, S. Fandos, R. Grudiev, A. Heikkinen, S. Rodriquez, J. A. Taborelli, M. Wuensch, W. Adolphsen, C. Laurent, L. GP IEEE TI High power test of an X-band slotted-iris accelerator structure at NLCTA SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The CLIC study group at CERN has built two X-band HDS (Hybrid Damped Structure) accelerating structures for high-power testing in NLCTA at SLAC. These accelerating structures are novel with respect to their rf-design and their fabrication technique. The eleven-cell constant impedance structures, one made out of copper and one out of molybdenum, are assembled from clamped high-speed milled quadrants. They feature the same heavy higher-order-mode damping as nominal CLIC structures achieved by slotted irises and radial damping waveguides for each cell. The X-band accelerators are exactly scaled versions of structures tested at 30 GHz in the CLIC test facility, CTF3. The results of the X-band tests are presented and compared to those at 30 GHz to determine frequency scaling, and are compared to the extensive copper data from the NLC structure development program to determine material dependence and make a basic validation of the HDS design. C1 [Doebert, S.; Fandos, R.; Grudiev, A.; Heikkinen, S.; Rodriquez, J. A.; Taborelli, M.; Wuensch, W.] CERN, Geneva, Switzerland. [Adolphsen, C.; Laurent, L.] SLAC, Menlo Pk, CA USA. RP Dobert, S (reprint author), CERN, Geneva, Switzerland. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3947 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304232 ER PT B AU Grelick, AE Cours, A DiMonte, NP Nassiri, A Smith, TL Waldschmidt, G AF Grelick, A. E. Cours, A. DiMonte, N. P. Nassiri, A. Smith, T. L. Waldschmidt, G. GP IEEE TI The Advanced Photon Source pulsed Deflecting Cavity RF System SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The Advanced Photon Source Deflecting Cavity System for producing short X-ray pulses uses two multi-cell, S-band cavities to apply a deflecting voltage to the stored electron beam ahead of an undulator that supports a beamline utilizing picosecond X-rays. Two additional multi-cell cavities are then used to cancel out the perturbation and restore the electron beam to its nominal orbit. The pulsed rf system driving the deflecting cavities is described. Design tradeoffs are discussed with emphasis on topology considerations and digital control loops making use of sampling technology in a manner consistent with the present state of the art. C1 [Grelick, A. E.; Cours, A.; DiMonte, N. P.; Nassiri, A.; Smith, T. L.; Waldschmidt, G.] Argonne Natl Lab, Argonne, IL 60439 USA. RP Grelick, AE (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3980 EP 3982 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304243 ER PT B AU Horan, D Bromberek, D Meyer, D Waldschmidt, G AF Horan, D. Bromberek, D. Meyer, D. Waldschmidt, G. GP IEEE TI High-power tests of a single-cell copper accelerating cavity driven by two input couplers SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB High-power tests were conducted on a 350-MHz, single-cell copper accelerating cavity driven simultaneously by two H-loop input couplers for the purpose of determining the reliability, performance, and power-handling capability of the cavity and related components, which have routinely operated at 100-kW power levels. The test was carried out utilizing the APS 350-MHz RF Test Stand [1], which was modified to split the input rf power into two 1/2-power feeds, each supplying power to a separate H-loop coupler on the cavity. Electromagnetic simulations of the two-coupler feed system were used to determine coupler match, peak cavity fields, and the effect of phasing errors between the coupler feed lines. The test was conducted up to a maximum total rf input power of 164-kW CW. Test apparatus details and performance data will be presented. C1 [Horan, D.; Bromberek, D.; Meyer, D.; Waldschmidt, G.] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. RP Horan, D (reprint author), Argonne Natl Lab, Adv Photon Source, 9700 S Cass Ave, Argonne, IL 60439 USA. EM horan@aps.anl.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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3983 EP 3985 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304244 ER PT B AU Shepard, KW Conway, ZA Fuerst, JD Kelly, MP Waldschmidt, GJ Porcellato, AM AF Shepard, K. W. Conway, Z. A. Fuerst, J. D. Kelly, M. P. Waldschmidt, G. J. Porcellato, A. M. GP IEEE TI Variable cw RF power coupler for 345 MHz superconducting cavities SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE ID SPOKE CAVITIES AB This paper reports the development of a cw variable coupler for 345 MHz spoke-loaded superconducting (SC) cavities. The coupler inserts an 80K copper loop into a 5 cm (2 inch) interior diameter coupling port on several types of spoke-loaded cavity operating at 2K or 4K. The coupling loop can be moved during operation to vary the coupling over a range of 50 dB. The coupler is designed to facilitate high-pressure water rinsing and low-particulate clean assembly. Design details and operating characteristics are discussed. C1 [Shepard, K. W.; Conway, Z. A.; Fuerst, J. D.; Kelly, M. P.; Waldschmidt, G. J.] Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. [Porcellato, A. M.] INFN, Legnaro, Italy. RP Shepard, KW (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. FU U. S. Department of Energy, Office of Nuclear Physics [DE-AC02-06CH11357] FX The authors thank Brian Rusnak of Lawrence Livermore National Laboratory for helpful advice and discussion.; We acknowledge the contributions of Dan Atkinson of Silvex, Inc., who provided high quality copper plating on the thermal transitions and the coaxial feed-through, and also of Bill Toter of the Argonne Central Shops, who oversaw fabrication of the brazed sub-assemblies.; This work was supported by the U. S. Department of Energy, Office of Nuclear Physics, under Contract No. DE-AC02-06CH11357. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3986 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304245 ER PT B AU Middendorf, ME Brumwell, FR Dooling, JC Horan, D Kustom, RL Lien, MK McMichael, GE Moser, MR Nassiri, A Wang, S AF Middendorf, M. E. Brumwell, F. R. Dooling, J. C. Horan, D. Kustom, R. L. Lien, M. K. McMichael, G. E. Moser, M. R. Nassiri, A. Wang, S. GP IEEE TI The IPNS second harmonic rf upgrade SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE ID SYSTEM AB The Intense Pulsed Neutron Source (IPNS) rapid cycling synchrotron (RCS) is used to accelerate protons from 50 MeV to 450 MeV, at a repetition rate of 30 Hz. The original ring design included two identical rf systems, each consisting of an accelerating cavity, cavity bias supply, power amplifiers and low-level analog electronics. The original cavities are located 180 degrees apart in the ring and provide a total peak accelerating voltage of similar to 21 kV over the 2.21-MHz to 5.14-MHz revolution frequency sweep. A third rf system has been constructed and installed in the RCS. The third rf system is capable of operating at the fundamental revolution frequency for the entire acceleration cycle, providing an additional peak accelerating voltage of up to similar to 11 kV, or at the second harmonic of the revolution frequency for the first similar to 4 ms of the acceleration cycle, providing an additional peak voltage of up to similar to 11 kV for bunch shape control. We describe here the hardware implementation and operation to date of the third rf cavity in the second harmonic mode. C1 [Middendorf, M. E.; Brumwell, F. R.; Dooling, J. C.; Horan, D.; Kustom, R. L.; Lien, M. K.; McMichael, G. E.; Moser, M. R.; Nassiri, A.; Wang, S.] Argonne Natl Lab, Argonne, IL 60439 USA. RP Middendorf, ME (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. EM mmiddendorf@anl.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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3989 EP 3991 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304246 ER PT B AU Norem, J Huang, D Stoltz, P Veitzer, S AF Norem, J. Huang, D. Stoltz, P. Veitzer, S. GP IEEE TI A general model of high gradient limits SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Recent experimental work done to develop high gradient, low frequency cavities for muon cooling has led to a model of rf breakdown and high gradient limits in warm structures. We have recently been extending this model to try to explain some superconducting rf quench mechanisms, as well as DC and dielectric breakdown. The model assumes that the dominant mechanisms in warm metal systems are fractures caused by the electric tensile stress, and surface micro-topography that is strongly determined by the cavity design and history. We describe how these processes can determine all measurable parameters in warm systems. With superconducting systems, these mechanisms also apply, however field emission, impurities and temperature produce a somewhat different picture of quenching and pulsed power processing. We describe the model and some recent extensions and improvements. C1 [Norem, J.] Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. [Huang, D.] IIT, Chicago, IL 60616 USA. [Stoltz, P.; Veitzer, S.] Tech X Crop, Boulder, CO 80303 USA. RP Norem, J (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. EM norem@anl.gov FU USDOE/Office of High Energy Physics, and the Neutrino Factory; Muon Collider Collaboration (NFMCC) FX This work has had continued support from the USDOE/Office of High Energy Physics, and the Neutrino Factory and Muon Collider Collaboration (NFMCC). 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3992 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304247 ER PT B AU Norem, J Bross, A Moretti, A Qian, Z Huang, D Torun, Y Rimmer, R Li, D Zisman, M AF Norem, J. Bross, A. Moretti, A. Qian, Z. Huang, D. Torun, Y. Rimmer, R. Li, D. Zisman, M. GP IEEE TI Recent rf results from the MuCool Test Area SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The MuCool Experiment has been continuing to take data with 805 and 201 MHz cavities in the MuCool Test Area. The system uses rf power sources from the Fermilab Linac. Although the experimental program is primarily aimed at the Muon Ionization Cooling Experiment (MICE), we have been studying the dependence of rf limits on frequency, cavity material, high magnetic fields, gas pressure, coatings, etc. with the general aim of understanding the basic mechanisms involved. The 201 MHz cavity, essentially a prototype for the MICE experiment, was made using cleaning techniques similar to those employed for superconducting cavities and operates at its design field with very little conditioning. C1 [Norem, J.] Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. [Bross, A.; Moretti, A.; Qian, Z.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. [Huang, D.; Torun, Y.] IIT, Chicago, IL 60616 USA. [Rimmer, R.] JLab, Newport News, VA 23606 USA. [Li, D.; Zisman, M.] LBNL, Berkeley, CA 94720 USA. RP Norem, J (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. EM norem@anl.gov FU USDOE/HEP; JLab; Fermilab FX We would like to acknowledge the support of the USDOE/HEP as well as the cooperation of the staff at JLab and Fermilab. Steve Virostek and Mike Dickenson of LBNL and Ben Ogert of Fermilab have been particularly helpful. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3995 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304248 ER PT B AU Ostroumov, PN Aseev, VN Barcikowski, A Clifft, B Pardo, R Sharamentov, SI Sengupta, M AF Ostroumov, P. N. Aseev, V. N. Barcikowski, A. Clifft, B. Pardo, R. Sharamentov, S. I. Sengupta, M. GP IEEE TI Beam test of a grid-less multi-harmonic buncher SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The Argonne Tandem Linear Accelerator System (ATLAS) is the first superconducting heavy-ion linac in the world. Currently ATLAS is being upgraded with the Californium Rare Ion Breeder Upgrade (CARIBU). The latter is a funded project to expand the range of short-lived, neutron-rich rare isotope beams available for nuclear physics research at ATLAS. To avoid beam losses associated with the existing gridded multi-harmonic buncher (MHB), we have developed and built a grid-less four-harmonic buncher with fundamental frequency of 12.125 MHz. In this paper, we report the results of the MHB commissioning and ATLAS beam performance with the new buncher. C1 [Ostroumov, P. N.; Aseev, V. N.; Barcikowski, A.; Clifft, B.; Pardo, R.; Sharamentov, S. I.; Sengupta, M.] Argonne Natl Lab, Argonne, IL 60439 USA. RP Ostroumov, PN (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. EM ostroumov@phy.anl.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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 3998 EP 4000 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304249 ER PT B AU Branlard, J Chase, B Cancelo, G Carcagno, R Edwards, H Fliller, R Hanna, B Harms, E Hocker, A Koeth, T Kucera, M Makulski, A Mavric, U McGee, M Paytyan, A Pischalnikov, Y Prieto, P Rechenmacher, R Reid, J Wilcer, N Treptow, K Zmuda, T AF Branlard, J. Chase, B. Cancelo, G. Carcagno, R. Edwards, H. Fliller, R. Hanna, B. Harms, E. Hocker, A. Koeth, T. Kucera, M. Makulski, A. Mavric, U. McGee, M. Paytyan, A. Pischalnikov, Y. Prieto, P. Rechenmacher, R. Reid, J. Wilcer, N. Treptow, K. Zmuda, T. GP IEEE TI Capture cavity II results at FNAL SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB As part of the research and development towards the International Linear Collider (ILC), several test facilities have been developed at Fermilab. This paper presents the latest Low Level RF (LLRF) results obtained with Capture Cavity II (CCII) at the ILC Test Accelerator (ILCTA) test facility. The main focus will be on controls and RF operations using the SIMCON based LLRF system developed in DESY [1]. Details about hardware upgrades and future work will be discussed. C1 [Branlard, J.; Chase, B.; Cancelo, G.; Carcagno, R.; Edwards, H.; Fliller, R.; Hanna, B.; Harms, E.; Hocker, A.; Koeth, T.; Kucera, M.; Makulski, A.; Mavric, U.; McGee, M.; Paytyan, A.; Pischalnikov, Y.; Prieto, P.; Rechenmacher, R.; Reid, J.; Wilcer, N.; Treptow, K.; Zmuda, T.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Branlard, J (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM branlard@fnal.gov 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4001 EP 4003 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304250 ER PT B AU Gonin, I Solyak, N DeFord, J Held, B AF Gonin, I. Solyak, N. DeFord, J. Held, B. GP IEEE TI Multipactor simulations in superconducting cavities SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The multipactor (MP)) is a well-known phenomenon. The existence of resonant trajectories can lead to electron avalanche under certain field levels and surface conditions, and can limit the performance of high power superconducting (SC) radio-frequency (RF) devices. In this paper we describe features of the ANALYST particle tracking code PT3P developed for W simulations in real 3D RF structures, such as cavities, couplers, RF windows etc. Also we present the results of W simulations in HOM couplers of TESLA, SNS and FNAL 3rd harmonic cavities. We discuss the comparison of simulations with experimental results. C1 [Gonin, I.; Solyak, N.] Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. [DeFord, J.; Held, B.] STAAR Inc, Mequon, WI 53092 USA. RP Gonin, I (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM gonin@fnal.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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4004 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304251 ER PT B AU Koeth, T Branlard, J Edwards, H Fliller, R Harms, E Hocker, A McGee, M Pischalnikov, Y Prieto, P Reid, J AF Koeth, T. Branlard, J. Edwards, H. Fliller, R. Harms, E. Hocker, A. McGee, M. Pischalnikov, Y. Prieto, P. Reid, J. GP IEEE TI Experience with Capture Cavity II SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Valuable experience in operating and maintaining superconducting RF cavities in a horizontal test module has been gained with Capture Cavity II. We report on all facets of our experience to date. C1 [Koeth, T.; Branlard, J.; Edwards, H.; Fliller, R.; Harms, E.; Hocker, A.; McGee, M.; Pischalnikov, Y.; Prieto, P.; Reid, J.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Koeth, T (reprint author), Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. FU U.S. Department of Energy [DE-AC02-07CH11359] FX Work supported by the U.S. Department of Energy under contract No. DE-AC02-07CH11359. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4007 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304252 ER PT B AU Harms, E Arkan, T Bellantoni, L Carter, H Edwards, H Foley, M Khabiboulline, T Nfitchell, D Olis, D Rowe, A Solyak, N AF Harms, E. Arkan, T. Bellantoni, L. Carter, H. Edwards, H. Foley, M. Khabiboulline, T. Nfitchell, D. Olis, D. Rowe, A. Solyak, N. GP IEEE TI Status of 3.9 GHz superconducting RF cavity technology at fermilab SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Fermilab is involved in an effort to assemble 3.9 GHz superconducting RF cavities into a four cavity cryomodule for use at the DESY TTF/FLASH facility as a third harmonic structure. The design gradient of the cavities is 14 MV/m. This effort involves design, fabrication, intermediate testing, assembly, and eventual delivery of the cryomodule. We report on all facets of this enterprise from design through future plans. Included will be test results of single 9-cell cavities, lessons learned, and current status. C1 [Harms, E.; Arkan, T.; Bellantoni, L.; Carter, H.; Edwards, H.; Foley, M.; Khabiboulline, T.; Nfitchell, D.; Olis, D.; Rowe, A.; Solyak, N.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Harms, E (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4010 EP 4012 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304253 ER PT B AU Kamerdzhiev, V Pfeffer, H Saewert, G Shiltsev, V Wolff, D AF Kamerdzhiev, V. Pfeffer, H. Saewert, G. Shiltsev, V. Wolff, D. GP IEEE TI A solid state Marx generator for TEL2 SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The solid-state Marx generator modulates the anode of the electron gun to produce the electron beam pulses in the second Tevatron Electron Lens (TEL2). It is capable of driving the 60 pF terminal with 600 ns pulses of up to 6 kV with a p.r.r. of 50 kHz. The rise and fall times are 150 ns. Stangenes Industries developed the unit and is working on a second version which will go to higher voltage and have the ability to vary its output in 396 ns intervals over a 5 mu s pulse. C1 [Kamerdzhiev, V.; Pfeffer, H.; Saewert, G.; Shiltsev, V.; Wolff, D.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Kamerdzhiev, V (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM vsevolod@fnal.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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4013 EP 4014 PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304254 ER PT B AU Khabiboulline, T Gonin, I Solyak, N AF Khabiboulline, Timergali Gonin, Ivan Solyak, Nikolay GP IEEE TI New HOM coupler design for 3.9 GHz superconducting cavities at FNAL SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Over the last few years Fermilab has developed the superconducting third harmonic section for the FLASH (TTF/DESY) upgrade. Initial vertical tests of 9-cell Nb cavities didn't reach the designed accelerating gradient. The main factor of gradient limitation was multipacting in the HOM coupler. In this paper we present the results of vertical tests accompanied with 3D analysis simulations of multipacting. Also we discuss the RF design of the new HOM couplers. The goal of the new design is to eliminate multipacting and to increase the second resonance frequency of the HOM coupler. Increasing this frequency reduces electric and magnetic fields, resulting in decreased thermal load on the antenna. Two cavities with modified HOM couplers have achieved operating gradients of 23MV/m. C1 [Khabiboulline, Timergali; Gonin, Ivan; Solyak, Nikolay] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Khabiboulline, T (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4015 EP 4017 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304255 ER PT B AU Lanfranco, G Apollinari, G Gonin, IV Khabiboulline, TN Romanov, G Wagner, R Bosotti, A AF Lanfranco, G. Apollinari, G. Gonin, I. V. Khabiboulline, T. N. Romanov, G. Wagner, R. Bosotti, Angelo GP IEEE TI Production of 325 MHz single spoke resonators at FNAL SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE DE cavity; power coupler; slow tuner; spoke resonator; superconducting; superconductivity AB The High intensity Neutrino Source (HINS) project represents the current effort at Fermi National Accelerator Laboratory to produce an 8-GeV proton linac based on about 400 independently phased superconducting resonators. Eighteen beta = 0.21 single spoke resonators, operating at 325 MHz, comprise the first stage of the linac cold section. We present the production status of the first two of these resonators along with progress on the slow tuning prototyping. In particular, we report on the construction phases, the pre-weld tuning process and the comparison of low power RF measurements with calculations. C1 [Lanfranco, G.] Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. [Lanfranco, G.; Apollinari, G.; Gonin, I. V.; Khabiboulline, T. N.; Romanov, G.; Wagner, R.; Bosotti, Angelo] Ist Nazl Fis Nucl, I-20133 Milan, Italy. RP Lanfranco, G (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA.; Lanfranco, G (reprint author), Ist Nazl Fis Nucl, I-20133 Milan, Italy. EM giobatta@fnal.gov FU U.S. Department of Energy [DE-AC02-76CH03000] FX This work was supported by the U.S. Department of Energy under contract number DE-AC02-76CH03000. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4018 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304256 ER PT B AU Li, JJ Harms, E Kubicki, T Nicklaus, D Olis, D Prieto, P Reid, J Solyako, N Wong, T AF Li, Jianjian Harms, Elvin Kubicki, Tom Nicklaus, Dennis Olis, Daniel Prieto, Peter Reid, John Solyako, Nikolay Wong, Thomas GP IEEE TI RF design and processing of a power coupler for third harmonic superconducting cavities SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The FLASH user facility providing free electron laser radiation is built based on the TIT project at DESY. Fermilab has the responsibility for the design and processing of a third harmonic, 3.9 GHz, superconducting cavity which is powered via a coaxial power coupler. Six power couplers have been manufactured at CPI after successful design of the power coupler including RF simulation, multipacting calculation, and thermal analysis. The power couplers are being tested and processed with high pulsed power in an elaborate test stand at Fermilab now. This paper presents the RF design and processing work of the power coupler. C1 [Li, Jianjian; Harms, Elvin; Kubicki, Tom; Nicklaus, Dennis; Olis, Daniel; Prieto, Peter; Reid, John; Solyako, Nikolay; Wong, Thomas] Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. [Wong, Thomas] IIT, Chicago, IL 60616 USA. RP Li, JJ (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM solyak@fnal.gov FU U.S. Department of Energy FX Work supported by U.S. Department of Energy. 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 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4021 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304257 ER PT B AU Li, JJ Solyak, N Wong, T AF Li, Jianjian Solyak, Nikolay Wong, Thomas GP IEEE TI Coupling interaction between the power coupler and the third harmonic superconducting cavity SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Fermilab has developed a third harmonic superconducting cavity operating at the frequency of 3.9 GHz to improve the beam performance for the FLASH user facility at DESY. It is interesting to investigate the coupling interaction between the SRF cavity and the power coupler with or without beam loading. The coupling of the power coupler to the cavity needs to be determined to minimize the power consumption and guarantee the best performance for a given beam current. In this paper, we build and analyze an equivalent circuit model containing a series of lumped elements to represent the resonant system. An analytic solution of the required power from the generator as a function of the system parameters has also been given based on a vector diagram. C1 [Li, Jianjian; Solyak, Nikolay] Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. [Wong, Thomas] IIT, Chicago, IL 60616 USA. RP Li, JJ (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM solyak@fnal.gov FU U.S. Department of Energy FX Work supported by U.S. Department of Energy. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4024 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304258 ER PT B AU Mavric, U Chase, B Branlard, J Cullerton, E Klepec, D AF Mavric, Uros Chase, Brian Branlard, Julien Cullerton, Ed Klepec, Dan GP IEEE TI A 96 channel receiver for the ILCTA LLRF system at fermelab SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The present configuration of an ILC main LINAC RF station has 26 nine cell cavities driven from one klystron. With the addition of waveguide power coupler monitors, 96 RF signals will be down-converted and processed. A do,An-converter chassis is being developed that contains 12 eight channel analog modules and a single up-converter module. This chassis will first be deployed for testing a cryomodule composed of eight cavities located at New Muon Laboratory (NUL) - Fermilab. Critical parts of the design for LLRF applications are identified and a detailed description of the circuit with various characteristic measurements is presented. The board is composed of an input band-pass filter centered at 1.3GHz, followed by a mixer, which down-converts the cavity probe signal to a proposed 13 MHz intermediate frequency. Cables with 8 channels per connector and good isolation between channels are being used to interconnect each down-converter module with a digital board. As mixers, amplifiers and power splitters are the most sensitive parts for noise, nonlinearities and crosstalk issues, special attention is given to these parts in the design of the LO port multiplication and distribution. C1 [Mavric, Uros; Chase, Brian; Branlard, Julien; Cullerton, Ed; Klepec, Dan] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Mavric, U (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM mavric@fnal.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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4027 EP 4029 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304259 ER PT B AU Mcgee, MW Pischalnikov, Y AF McGee, M. W. Pischalnikov, Y. GP IEEE TI Mechanical stability study of capture cavity II at fermilab SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Problematic resonant conditions at both 18 Hz and 180 Hz were encountered and identified early during the commissioning of Capture Cavity II (CC2) at Fermilab. CC2 consists of an external vacuum vessel and a superconducting high gradient (close to 25 MV/m) 9-cell 1.3 GHz niobium cavity, transported from DESY for use in the A0 Photoinjector at Fermilab. An ANSYS modal finite element analysis (FEA) was performed in order to isolate the source of the resonance and directed the effort towards stabilization. Using a fast piezoelectric tuner to excite (or shake) the cavity at different frequencies (from 5 Hz to 250 Hz) at a low-range sweep for analysis purposes. Both warm (300 K) and cold (1.8 K) accelerometer measurements at the cavity were taken as the resonant "fix" was applied. FEA results, cultural and technical noise investigation, and stabilization techniques are discussed. C1 [McGee, M. W.; Pischalnikov, Y.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Mcgee, MW (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM mcgee@fnal.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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4030 EP 4032 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304260 ER PT B AU Mcgee, MW Doremus, R Wands, CR AF McGee, M. W. Doremus, R. Wands, C. R. GP IEEE TI Mechanical stability study of type IV cryomodule (ILC prototype) SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB An ANSYS modal and harmonic finite element analysis (FEA) was performed in order to investigate cryomodule design mechanical stability for the proposed International Linear Collider (ILC). The current cryomodule, designated Type IV or (T4CM), closely follows the Type III TESLA Test Facility (TTF) version used at DESY, with the exception of a proposed location of the superconducting (SC) quadrupole at the center. This analysis considered the stringent stability criteria established for the ILC, where vertical motion for the SC quadrupole is limited to the micron range at a few Hz. Model validation was achieved through Type III cryomodule vibration measurement studies performed at DESY. The effect of support location, support stiffness and other important parameters were considered in a parametric sensitivity study. FEA results, fast motion investigations and stabilization techniques are discussed. C1 [McGee, M. W.; Doremus, R.; Wands, C. R.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Mcgee, MW (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM mcgee@fnal.gov 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4033 EP 4035 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304261 ER PT B AU Orris, D Bellantoni, L Carcagno, RH Edwards, H Harms, ER Khabiboulline, TN Kotelnikov, S Makulski, A Nehring, R Pischalnikov, Y AF Orris, Darryl Bellantoni, Leo Carcagno, Ruben H. Edwards, Helen Harms, Elvin Robert Khabiboulline, Timergali N. Kotelnikov, Sergey Makulski, Andrzej Nehring, Roger Pischalnikov, Yuriy GP IEEE TI Fast thermometry for superconducting RF cavity testing SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Fast readout of strategically placed low heat capacity thermometry can provide valuable information of Superconducting RF (SRF) cavity performance. Such a system has proven very effective for the development and testing of new cavity designs. Recently, several resistance temperature detectors (RTDs) were installed in key regions of interest on a new 9 cell 3.9 GHz SRF cavity with integrated HOM design at FNAL. A data acquisition system was developed to read out these sensors with enough time and temperature resolution to measure temperature changes on the cavity due to heat generated from multipacting or quenching within power pulses. The design and performance of the fast thermometry system will be discussed along with results from tests of the 9 cell 3.9GHz SRF cavity. C1 [Orris, Darryl; Bellantoni, Leo; Carcagno, Ruben H.; Edwards, Helen; Harms, Elvin Robert; Khabiboulline, Timergali N.; Kotelnikov, Sergey; Makulski, Andrzej; Nehring, Roger; Pischalnikov, Yuriy] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Orris, D (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM orris@fnal.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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4036 EP 4038 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304262 ER PT B AU Ozelis, JP Carcagno, R Ginsburg, CM Huang, Y Norris, B Peterson, T Poloubotko, V Rabehl, R Rakhno, I Reid, C Sergatskov, DIA Sylvester, C Wong, M Worel, C AF Ozelis, Joseph P. Carcagno, Ruben Ginsburg, Camille M. Huang, Yuenian Norris, Barry Peterson, Thomas Poloubotko, Valeri Rabehl, Roger Rakhno, Igor Reid, Clark Sergatskov, Dn-Itri A. Sylvester, Cosmore Wong, Mayling Worel, Chuck GP IEEE TI Design and commissioning of Fermilab's vertical test stand for ILC SRF cavities SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB As part of its ILC program, Fermilab is developing a facility for vertical testing of SRF cavities. It operates at a nominal temperature of 2K, using a cryoplant that can supply LHe in excess of 20g/sec and provide bath pumping capacity of 125W at 2K. The below-grade cryostat consists of a vacuum vessel and LHe vessel, equipped with magnetic shielding to reduce the ambient magnetic field to < 10mG. Internal fixed and external movable radiation shielding ensures that exposure to personnel is mininized. The facility features an integrated personnel safety system consisting of RF switches, interlocks, and area radiation monitors. C1 [Ozelis, Joseph P.; Carcagno, Ruben; Ginsburg, Camille M.; Huang, Yuenian; Norris, Barry; Peterson, Thomas; Poloubotko, Valeri; Rabehl, Roger; Rakhno, Igor; Reid, Clark; Sergatskov, Dn-Itri A.; Sylvester, Cosmore; Wong, Mayling; Worel, Chuck] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Ozelis, JP (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM ozelis@fnal.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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4039 EP 4041 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304263 ER PT B AU Ozelis, JP Nehring, R Grenoble, C Powers, TJ AF Ozelis, Joseph P. Nehring, Roger Grenoble, Christiana Powers, Thomas J. GP IEEE TI RF and data acquisition systems for Fermilab's ILC SRF cavity vertical test stand SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Fermilab is developing a facility for vertical testing of SRF cavities as part of its ILC program. The RF system for this facility is based on the proven production cavity test systems used at Jefferson Lab for CEBAF and SNS cavity testing. The design approach is modular in nature, using commercial-off-the-shelf (COTS) components. This yields a system that can be easily debugged and modified, and with ready availability of spares. Comprehensive data acquisition and control is provided by a PXI-based hardware platform in conjunction with software developed in the LabView programming environment. C1 [Ozelis, Joseph P.; Nehring, Roger] Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. [Grenoble, Christiana; Powers, Thomas J.] TJNAF, Newport News 23696, VA USA. RP Ozelis, JP (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM ozelis@fnal.gov FU U.S. Department of Energy [DE-AC02-76CH03000] FX Work supported by U.S. Department of Energy under contract DE-AC02-76CH03000 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 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4042 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304264 ER PT B AU Pischalnikov, Y Branlard, J Carcagno, R Chase, B Edwards, H Orris, D Makulski, A Mcgee, M Nehring, R Poloubotko, V Sylvester, C Tariq, S AF Pischalnikov, Y. Branlard, J. Carcagno, R. Chase, B. Edwards, H. Orris, D. Makulski, A. McGee, M. Nehring, R. Poloubotko, V. Sylvester, C. Tariq, S. GP IEEE TI A technique for monitoring fast tuner piezoactuator preload forces for superconducting RF cavities SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The technology for mechanically compensating Lorentz Force detuning in superconducting RF cavities has already been developed at DESY. One technique is based on commercial piezoelectric actuators and was successfully demonstrated on TESLA cavities [1]. Piezo actuators for fast tuners can operate in a frequency range up to several kHz; however, it is very important to maintain a constant static force (preload) on the piezo actuator in the range of 10 to 50% of its specified blocking force. Determining the preload force during cool-down, warm-up, or re-tuning of the cavity is difficult without instrumentation, and exceeding the specified range can permanently damage the piezo stack. A technique based on strain gauge technology for superconducting magnets has been applied to fast tuners for monitoring the preload on the piezoelectric assembly. The design and testing of piezo actuator preload sensor technology is discussed. Results from measurements of preload sensors installed on the timer of the Capture Cavity II (CCII)[2] tested at FNAL are presented. These results include measurements during cool-down, warm-up, and cavity tuning along with dynamic Lorentz force compensation. C1 [Pischalnikov, Y.; Branlard, J.; Carcagno, R.; Chase, B.; Edwards, H.; Orris, D.; Makulski, A.; McGee, M.; Nehring, R.; Poloubotko, V.; Sylvester, C.; Tariq, S.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Pischalnikov, Y (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM pischaln@fnal.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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4045 EP 4047 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304265 ER PT B AU Ristori, L Apollinari, G Gonin, I Khabiboulline, T Romanov, G AF Ristori, L. Apollinari, G. Gonin, I. Khabiboulline, T. Romanov, G. GP IEEE TI Fabrication and test of the first normal-conducting crossbar H-type accelerating cavity at Fermilab for HINS SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The proposed High Intensity Neutrino Source (HINS) at Fermilab is based on an 8 GeV linear proton accelerator that consists of a normal-conducting (warm) and a superconducting section. The warm section is composed of an ion source, a radio frequency quadrupole, a medium energy beam transport (MEBT) and 16 warm Crossbar H-type (CH) cavities that accelerate the beam from 2.5 MeV to 10 MeV (from beta=0.0744 to beta=0.1422). These warm cavities are separated by superconducting solenoids enclosed in individual cryostats. Beyond 10 MeV, the design uses superconducting spoke resonators to accelerate the beam up to 8 GeV. In this paper, we illustrate the completion of the first warm CH cavity (beta=0.0744) explaining in detail the mechanical engineering aspects related to the machining and brazing processes. The radio-frequency (RF) measurements and tuning performed at Fermilab on the resonator and comparisons with simulations are also discussed. C1 [Ristori, L.; Apollinari, G.; Gonin, I.; Khabiboulline, T.; Romanov, G.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Ristori, L (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM leoristo@fnal.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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4048 EP 4050 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304266 ER PT B AU Khabiboulline, T Cooper, C Dhanaraj, N Edwards, H Foley, M Harms, E Mitchell, D Rowe, A Solyak, N Moeller, WD AF Khabiboulline, Timergali Cooper, Charles Dhanaraj, Nandhini Edwards, Helen Foley, Mike Harms, Elvin Mitchell, Donald Rowe, Allan Solyak, Nikolay Moeller, Wolf-Dietrich GP IEEE TI 3.9 GHZ superconducting accelerating 9-cell cavity vertical test results SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The 3rd harmonic 3.9GHz accelerating cavity was proposed to improve the beam performance of the FLASH (TTF/DESY) facility [1]. In the frame of a collaborative agreement, Fermilab will provide DESY with a cryomodule containing a string of four cavities. In addition, a second cryomodule with one cavity will be fabricated for installation in the Fermilab photo-injector, which will be upgraded for the ILC accelerator test facility. The first 9-cell Nb cavities were tested in a vertical setup and they didn't reach the designed accelerating gradient [2]. The main problem was a multipactor in the HOM couplers, which lead to overheating and quenching of the HOM couplers. New HOM couplers with improved design are integrated in the next 9-cell cavities. In this paper we present all results of the vertical tests. C1 [Khabiboulline, Timergali; Cooper, Charles; Dhanaraj, Nandhini; Edwards, Helen; Foley, Mike; Harms, Elvin; Mitchell, Donald; Rowe, Allan; Solyak, Nikolay] Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. [Moeller, Wolf-Dietrich] DESY, Hamburg, Germany. RP Khabiboulline, T (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4051 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304267 ER PT B AU Varghese, P Chase, B Bames, B Branlard, J Joireman, PW Klepec, D Mavric, U Tupikov, V AF Varghese, P. Chase, B. Bames, B. Branlard, J. Joireman, P. W. Klepec, D. Mavric, U. Tupikov, V. GP IEEE TI Multichannel vector field control module for LLRF control of superconducting cavities SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The field control of multiple superconducting RF cavities with a single Klystron, such as the proposed RF scheme for the ILC, requires high density (number of RF channels) signal processing hardware so that vector control may be implemented with minimum group delay. The WC (Multichannel Field Control) module is a 33-channel, FPGA based down-conversion and signal processing board in a single VXI slot, with 4 channels of high speed DAC outputs. A 32-bit, 400MHz floating point DSP provides additional computational and control capability for calibration and implementation of more complex control algorithms. Multiple high speed serial transceivers on the front panel and the backplane bus allow a flexible architecture for inter-module real time data exchanges. An interface CPLD supports the VXI bus protocol for communication to a Slot0 CPU, with Ethernet connections for remote in system programming of the FPGA and DSP as well as data acquisition. C1 [Varghese, P.; Chase, B.; Bames, B.; Branlard, J.; Joireman, P. W.; Klepec, D.; Mavric, U.; Tupikov, V.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Varghese, P (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM varghese@fnal.gov 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4054 EP 4056 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304268 ER PT B AU Baptiste, K Casey, P Kwiatkowski, S Timossi, C AF Baptiste, K. Casey, P. Kwiatkowski, S. Timossi, C. GP IEEE TI Results of the als booster ring RF system upgrade for top-off mode of operation SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB ALS, one of the first third generation synchrotron light sources which has been operating since 1993 at Berkeley Lab has been upgraded from its present operation scenario of injecting the 1.5GeV electron beam from the Booster ring into the Storage ring every 8 hours, where it is accelerated to the final energy of 1.9GeV, to full energy (1.9GeV) injection from the Booster ring into the Storage ring every 3 seconds for filling and every 30-35 seconds for "Top-Off' mode. Additionally the beam current will be increased from the time averaged value of 250mA to 500mA to increase the brightness. In this paper we will present the final design of the Booster RF power source and control system upgrades and the performance results of the new ALS injector RF system set-up for Top-Off mode of operation and. C1 [Baptiste, K.; Casey, P.; Kwiatkowski, S.; Timossi, C.] LBNL, Berkeley, CA 94720 USA. RP Baptiste, K (reprint author), LBNL, Berkeley, CA 94720 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4063 EP 4065 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304271 ER PT B AU Byrd, J Doolittle, L Ratti, A Staples, JW Wilcox, R Stettler, M D'Auria, G Ferianis, M Milloch, M Rohlev, A AF Byrd, J. Doolittle, L. Ratti, A. Staples, J. W. Wilcox, R. Stettler, M. D'Auria, G. Ferianis, M. Milloch, M. Rohlev, A. GP IEEE TI Plans for precision RF controls for FERMI@ELETTRA SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB FERMI@ELETTRA is a 4th generation light source under construction at Sincrotrone Trieste. It will be operated as a seeded FEL driven by a warm S-band Linac presently serving as the injector for the ELETTRA storage ring. Operation as an FEL driver places much more stringent specifications on control of the amplitude and phase of the RF stations than in its present operation. This paper describes a conceptual design of new RF controls to achieve these specifications. The system consists of a stabilized distribution of the master oscillator signal providing a reference to local digital RF controllers. The RF controller is based on recent improvements on modem digital systems, using a 16-bit high speed digitizer in combination with an FPGA and high speed DAC. C1 [Byrd, J.; Doolittle, L.; Ratti, A.; Staples, J. W.; Wilcox, R.; Stettler, M.; D'Auria, G.; Ferianis, M.; Milloch, M.; Rohlev, A.] LBNL, Berkeley, CA USA. RP Byrd, J (reprint author), LBNL, Berkeley, CA 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4066 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304272 ER PT B AU Virostek, S Hoff, M Li, D Staples, J Wells, R AF Virostek, S. Hoff, M. Li, D. Staples, J. Wells, R. GP IEEE TI Mechanical design & analysis of a 200 MHZ, bolt-together RFQ for the accelerator driven neutron source SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB A high-yield neutron source to screen sea-land cargo containers for shielded Special Nuclear Materials (SNM) has been designed at LBNL [1,2]. The Accelerator-Driven Neutron Source (ADNS) uses the D(d,n)3He reaction to create a forward directed neutron beam. Key components are a high-current radio-frequency quadrupole (RFQ) accelerator and a high-power target capable of producing a neutron flux of > 10(Lambda) 7n/(cm(Lambda)2.s) at a distance of 2.5 in. The mechanical design and analysis of the four-module, bolt-together RFQ will be presented here. Operating at 200 MHz, the 5.1 m long RFQ will accelerate a 40 mA deuteron beam to 6 MeV. At a 5% duty factor, the time-average d(+) beam current on target is 1.5 mA. Each of the 1.27 m long RFQ modules will consist of four solid OFHC copper vanes. A specially designed 3-13 O-ring will provide vacuum sealing between both the vanes and the modules. RF connections are made with canted coil spring contacts. A series of 60 water-cooled pi-mode rods provides quadrupole mode stabilization. A set of 80 evenly spaced fixed slug tuners is used for final frequency adjustment and local field perturbation correction. C1 [Virostek, S.; Hoff, M.; Li, D.; Staples, J.; Wells, R.] Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. RP Virostek, S (reprint author), Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. 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 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4069 EP 4071 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304273 ER PT B AU Geng, RL Eremeev, GV Padamsee, H Shemelin, VD AF Geng, R. L. Eremeev, G. V. Padamsee, H. Shemelin, V. D. GP IEEE TI High gradient studies for ILC with single-cell re-entrant shape and elliptical shape cavities made of fine-grain and large-grain niobium SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Based on the encouraging results of the first 1300 MHz 70 mm aperture single-cell re-entrant cavities, we continue the high gradient studies for ILC with new re-entrant cavities made of fine-grain as well as large-grain niobium. These new cavities have smaller apertures of 60 mm, providing a further reduced H-pk/E-acc or a further improved ultimate gradient. Four 1300 MHz 60 mm aperture re-entrant cavities are made, two out of fine grain niobium and the other two out of large-grain niobium. In addition, two elliptical shape 1500 MHz cavities are also made out of large-grain niobium. A new record gradient of 59 MV/m was achieved in a 60 mm aperture 1300 MHz single-cell fine-grain niobium cavity. C1 [Geng, R. L.; Eremeev, G. V.; Padamsee, H.; Shemelin, V. D.] Jefferson Lab, 12000 Jefferson Ave, Newport News, VA 23606 USA. RP Geng, RL (reprint author), Jefferson Lab, 12000 Jefferson Ave, Newport News, VA 23606 USA. EM rg58@cornell.edu FU NSF; DOE FX Work supported by NSF and DOE 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4093 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304281 ER PT B AU Harris, JR Chen, YJ Blackfield, D Sanders, DM Caporaso, GJ Krogh, M AF Harris, J. R. Chen, Y. -J. Blackfield, D. Sanders, D. M. Caporaso, G. J. Krogh, M. GP IEEE TI Vacuum insulator studies for the Dielectric Wall Accelerator SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE ID SURFACE FLASHOVER AB As part of our ongoing development of the Dielectric Wall Accelerator, we are studying the performance of multilayer high-gradient insulators. These vacuum insulating structures are composed of thin, alternating layers of metal and dielectric, and have been shown to withstand higher gradients than conventional vacuum insulator materials. This paper describes these structures and presents some of our recent results. C1 [Harris, J. R.; Chen, Y. -J.; Blackfield, D.; Sanders, D. M.; Caporaso, G. J.] Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. [Krogh, M.] Univ Missouri, Columbia, MO 65211 USA. RP Harris, JR (reprint author), Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. EM harris89@llnl.gov FU U.S. Department of Energy by University of California; Lawrence Livermore National Laboratory [W-7405-Eng-48] FX The authors would like to thank R. Anaya, J. Stanley, S. Hawkins, C. Holmes, and M. Kendig for their assistance with these experiments. This work was performed under the auspices of the U.S. Department of Energy by University of California, Lawrence Livermore National Laboratory under Contract W-7405-Eng-48. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4114 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304288 ER PT B AU DeHope, WJ Griffin, KL Kihara, R Ong, MM Ross, TO AF DeHope, W. J. Griffin, K. L. Kihara, R. Ong, M. M. Ross, T. O. GP IEEE TI An improved SF(6) system for the FXR induction linac Blumlein switches SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE ID ELECTRONS AB \ The now-mature FXR (Flash X-Ray) radiographic facility at Lawrence Livermore National Laboratory will be briefly described with emphasis on its pulsed power system. The heart of each accelerating cell's pulse-forming Blumlein is it's sulfur hexafluoride-based triggered closing switch. FXR's recent upgrade to a recirculating SF(6) gas reclamation system will be described and the resulting accelerator performance and reliability improvements documented. This was accompanied by a detailed switch breakdown study on FXR's Test Stand and the recent analysis of the resulting statistics will be shown. C1 [DeHope, W. J.; Griffin, K. L.; Kihara, R.; Ong, M. M.; Ross, T. O.] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP DeHope, WJ (reprint author), Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. EM dehope1@llnl.gov 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4117 EP 4119 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304289 ER PT B AU Rusnak, B Wang, F Adolphsen, C Bowden, G Nantista, C Swent, R Tice, J Mckee, B Jobe, K Li, Z Ge, L AF Rusnak, B. Wang, F. Adolphsen, C. Bowden, G. Nantista, C. Swent, R. Tice, J. Mckee, B. Jobe, K. Li, Z. Ge, L. GP IEEE TI High-power coupler component test stand status and results SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Fundamental power couplers for superconducting accelerator applications like the ILC are complicated transmission line assemblies that must simultaneously accommodate demanding RF power, cryogenic, and cleanliness constraints. When these couplers are RF conditioned, the observed response is an aggregate of all the parts of the coupler and the specific features that dominate the conditioning response are hard to determine. To better understand and characterize RF conditioning phenomena toward improving performance and reducing conditioning time, a high-power coupler component test stand has been built at SLAC. Operating at 1.3 GHz, this test stand was designed to measure the conditioning behavior of select components of the TTFIII coupler independently, including outer-conductor bellows, tube transitions, copper plating, surface preparations, and cold window geometries and coatings. A description of the test stand, the measurement approach, and a summary of the results obtained so far are presented. C1 [Rusnak, B.] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. [Wang, F.; Adolphsen, C.; Bowden, G.; Nantista, C.; Swent, R.; Tice, J.; Mckee, B.; Jobe, K.; Li, Z.; Ge, L.] SLAC, Menlo Pk, CA 94025 USA. RP Rusnak, B (reprint author), Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. FU University of California; Livermore National Laboratory [W-7405-Eng-48]; DOE [DE-AC02-76F00515] FX This work was performed under the auspices of the U.S. Department of Energy by the University of California, Livermore National Laboratory under Contract No. W-7405-Eng-48.; Work Supported by DOE Contract DE-AC02-76F00515. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4123 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304291 ER PT B AU Tantawi, SG Dolgashev, V Bowden, G Lewandowski, J Nantista, CD Canabal, A Tajima, T Campisi, IE AF Tantawi, S. G. Dolgashev, V. Bowden, G. Lewandowski, J. Nantista, C. D. Canabal, A. Tajima, T. Campisi, I. E. GP IEEE TI Superconducting materials testing with a high-Q copper FR cavity SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Superconducting RF is of increasing importance in particle accelerators. We have developed a resonant cavity with high quality factor and an interchangeable wall for testing of superconducting materials. A compact TE01 mode launcher attached to the coupling iris selectively excites the azimuthally symmetric cavity mode, which allows a gap at the detachable wall and is free of surface electric fields that could cause field emission, multipactor, and RF breakdown. The shape of the cavity is tailored to focus magnetic field on the test sample. We describe cryogenic experiments conducted with this cavity. An initial experiment with copper benchmarked our apparatus. This was followed by tests with Nb and MgB2. In addition to characterizing the onset of superconductivity with temperature, our cavity can be resonated with a high power klystron to determine the surface magnetic field level sustainable by the material in the superconducting state. A feedback code is used to make the low level RF drive track the resonant frequency. C1 [Tantawi, S. G.; Dolgashev, V.; Bowden, G.; Lewandowski, J.; Nantista, C. D.] SLAC, Menlo Pk, CA USA. [Canabal, A.; Tajima, T.] Los Alamos, LAN, Los Alamos, NM 87545 USA. [Campisi, I. E.] Oak Ridge, Oak Ridge, TN 37831 USA. RP Tantawi, SG (reprint author), SLAC, Menlo Pk, CA USA. EM acanabal@lanl.gov FU US Department of Energy FX Work supported by the US Department of Energy. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4126 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304292 ER PT B AU Ekdahl, C Abeyta, EO Aragon, P Archuleta, R Bartsch, R Dalmas, D Eversole, S Gallegos, R Harrison, J Johnson, J Jacquez, E McCuistian, BT Montoya, N Nath, S Oro, D Rowton, L Sanchez, M Scarpetti, R Schauer, M Seitz, G Bender, H Broste, W Carlson, C Frayer, D Johnson, D Tipton, A Tom, CY Schulze, M AF Ekdahl, Carl Abeyta, E. O. Aragon, P. Archuleta, R. Bartsch, R. Dalmas, D. Eversole, S. Gallegos, R. Harrison, J. Johnson, J. Jacquez, E. McCuistian, B. Trent Montoya, N. Nath, S. Oro, D. Rowton, L. Sanchez, M. Scarpetti, R. Schauer, M. Seitz, G. Bender, H. Broste, W. Carlson, C. Frayer, D. Johnson, D. Tipton, A. Tom, C. Y. Schulze, M. GP IEEE TI Commissioning the DARHT-II scaled accelerator SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE ID LINEAR INDUCTION ACCELERATOR AB When completed, the DARHT-II accelerator will produce a 2-kA, 17-MeV beam in a 1600-ns pulse. After exiting the accelerator, the long pulse will be sliced into four short pulses by a kicker and quadrupole septum and then transported for several meters to a tantalum target for conversion to bremsstrahlung for radiography[1]. In order to provide early tests of the kicker, septum, transport, and multi-pulse converter target we assembled a short accelerator from the first available refurbished cells, which are now capable of operating of operating at over 200 kV [2]. This scaled accelerator was operated at similar to 8 Mev and similar to 1 kA, which provides a beam with approximately the same beam dynamics in the downstream transport as the final 17-MeV, 2-kA beam. C1 [Ekdahl, Carl; Abeyta, E. O.; Aragon, P.; Archuleta, R.; Bartsch, R.; Dalmas, D.; Eversole, S.; Gallegos, R.; Harrison, J.; Johnson, J.; Jacquez, E.; McCuistian, B. Trent; Montoya, N.; Nath, S.; Oro, D.; Rowton, L.; Sanchez, M.; Scarpetti, R.; Schauer, M.; Seitz, G.] Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. [Bender, H.; Broste, W.; Carlson, C.; Frayer, D.; Johnson, D.; Tipton, A.; Tom, C. Y.] Bechtel Nevada, Los Alamos, NM 87544 USA. [Schulze, M.] SAIC, San Diego, CA 92121 USA. RP Ekdahl, C (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. EM cekdahl@lanl.gov FU US National Nuclear Security Agency; US Department of Energy [W-7405-ENG-36] FX Work supported by the US National Nuclear Security Agency and the US Department of Energy under contract W-7405-ENG-36. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4129 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304293 ER PT B AU Krawczyk, FL Bolme, GO Clark, WL Kelley, JP Martinez, FA Nguyen, DC Young, KA Rathke, J Schrage, DL Schultheiss, T Young, LM AF Krawczyk, Frank L. Bolme, Gerald O. Clark, William L. Kelley, J. Patrick Martinez, Felix A. Nguyen, Dinh C. Young, Karen A. Rathke, John Schrage, Dale L. Schultheiss, Thomas Young, Lloyd M. GP IEEE TI RF-loss measurements in an open coaxial resonator for characterization of copper plating SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB An experiment has been conducted to measure differences in cavity Q caused by various cavity surface treatments. A requirement of the experiment was that it show little sensitivity to the reassembly of the apparatus with various test pieces. We chose a coaxial half-wave resonator, with an outer conductor extending significantly beyond the length of the inner conductor. At 700 MHz the outer conductor acts as a cut-off tube, eliminating the need for electric termination and thus any RF-contacts that can influence the accuracy of the Q-measurements. The experiment is aimed at qualifying the performance of cyanide-copper plated GlidCop Al-15 LO-OX in comparison with that of a machined GlidCop Al-15 LO-OX surface. To maximize the sensitivity of the measurement we use a fixed outer conductor made of Oxygen Free Electronic (OFE) copper and only replaced the inner conductor, which is mounted on a low-loss Teflon pedestal located in the low electric field region of the half-wave TEM mode. The Q-values of machined GlidCop Al-15 and cyanide-copper plated GlidCop Al-15 inner conductors are measured against the reference Q of the annealed OFE co-axial cavity. This extremely simple configuration allows a statistically significant number of repetitions of measurements and should provide accurate comparative measurements. The results will be useful for the community in deciding the surface treatments for high-Q copper accelerators. While outside of the scope of the qualification of the cyanide copper plating, two UBAC plated OFE copper pieces have been added to the comparison. C1 [Krawczyk, Frank L.; Bolme, Gerald O.; Clark, William L.; Kelley, J. Patrick; Martinez, Felix A.; Nguyen, Dinh C.; Young, Karen A.] Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. [Rathke, John; Schrage, Dale L.; Schultheiss, Thomas; Young, Lloyd M.] Adv Engn Syst, Medford, MA 11763 USA. RP Krawczyk, FL (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. EM fkrawczyk@lanl.gov FU HEL-JTO FX Work supported by HEL-JTO 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4132 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304294 ER PT B AU Kwon, S Davis, J Lynch, M Prokop, M Ruggles, S Torrez, P AF Kwon, Sungil Davis, J. Lynch, M. Prokop, M. Ruggles, S. Torrez, P. GP IEEE TI Gain scheduled neural network tuned PI Feedback control system for the LANSCE accelerator SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The current LANSCE LLRF system is an analog PI Feedback control system which achieves the amplitude and phase error within 1% and I degree. The feedback system receives the cavity amplitude and phase and the crosstalk between the amplitude and the phase paths is significant. We propose an In-phase (I) and Quadrature (Q) based feedback control system which easily decouples the crosstalk of I and Q channels. A gain scheduled PI feedback controller with optimally generated set point trajectory reduces the transient peak of the feedback controller and hence reduce the fatigue of the RF amplifier chain. An additional feature of the controller is the Neural network based self-tuning PI feedback, where the neural network tunes the feedback gains to minimize the errors in the least squares sense. The proposed control system is implemented with Altera Stratix II FPGA. The control system is modeled with DSP Builder and automatically generates HDL. Altera SOPC Builder is used for the hardware integration of the DSP Builder model, memories, peripherals, and 32 bit NIOS II embedded processor. NIOS II processor equipped with real time operating system communicates with the host computer via Ethernet, uploads data, computes parameters, and downloads parameters. The proposed control system is tested with the low power test-stand for the robustness of the algorithm. C1 [Kwon, Sungil; Davis, J.; Lynch, M.; Prokop, M.; Ruggles, S.; Torrez, P.] Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Kwon, S (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. EM skwon@lanl.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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4135 EP 4137 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304295 ER PT B AU Lyles, J Archuletta, S Davis, J Rees, D Torrez, P Baca, D AF Lyles, J. Archuletta, S. Davis, J. Rees, D. Torrez, P. Baca, D. GP IEEE TI Progress on new high power RF system for LANSCE DTL SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB A new 201.25 MHz RF system is being developed for the LANSCE proton drift tube linac (DTL). A planned upgrade will replace parts of the DTL RF system with new generation components. When installed for the LANSCE-R project, the new system will reduce the total number of electron power tubes from twenty-four to seven in the RF power plant. The 3.4 MW final power amplifier will use a Thales TH628 Diacrode (R). This state-of-the-art device eliminates the large anode modulator of the present triode system, and will be driven by a new tetrode intermediate power amplifier. In this mode of operation, this intermediate stage will provide 150 kW of peak power. The first DTL tank requires up to 400 kW of RF power, which will be provided by the same tetrode driver amplifier. A prototype system is being constructed to test components, using some of the infrastructure from previous RF projects. High voltage DC power became available through innovative re-engineering of an installed system. A summary of the design and construction of the intermediate power amplifier will be presented and test results will be summarized. C1 [Lyles, J.; Archuletta, S.; Davis, J.; Rees, D.; Torrez, P.] Los Alamos Natl Lab, Los Alamos, NM 87545 USA. [Baca, D.] Sandia Natl Labs, Albuquerque, NM USA. RP Lyles, J (reprint author), Los Alamos Natl Lab, Los Alamos, NM 87545 USA. EM jtml@lanl.gov FU NNSA; US Department of Energy [DE-AC52-06NA25396] FX Work supported by the NNSA, US Department of Energy under contract DE-AC52-06NA25396. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4138 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304296 ER PT B AU Nielsen, K Barraza, J Kang, M Bieniosek, F Chow, K Fawley, W Henestroza, E Reginato, L Waldron, W Prichard, B Briggs, R Genoni, T Hughes, T AF Nielsen, K. Barraza, J. Kang, M. Bieniosek, F. Chow, K. Fawley, W. Henestroza, E. Reginato, L. Waldron, W. Prichard, B. Briggs, R. Genoni, T. Hughes, T. GP IEEE TI Upgrades to the DARHT second axis induction cells SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The Dual-Axis Radiographic Hydrodynamics Test (DARHT) facility will employ two perpendicular electron Linear Induction Accelerators to produce intense, bremsstrahlung x-ray pulses for flash radiography. The second axis, DARHT II [1], features a 2.5-MeV injector and a 15.5-MeV, 2-kA, 1.6-microsecond accelerator consisting of 74 induction cells and drivers. Major induction cell components include high flux swing magnetic material (Metglas 2605SC) and a Mycalex (TM) insulator. The cell drivers are pulse forming networks (PFNs). The DARHT II accelerator cells have undergone a series of test and modeling efforts to fully understand their operational parameters. These R&D efforts identified problems in the original cell design and means to upgrade the design, performance and reliability of the linear induction cells [2]. Physical changes in the cell oil region, the cell vacuum region, and the cell drivers, together with different operational and maintenance procedures, have been implemented in the refurbished units resulting in greatly enhanced cell performance and reliability. All 74 cells have now been refurbished and tested for acceptance. This paper gives the results of those tests and the performance of the 26 refurbished cells in the Scaled Accelerator. C1 [Nielsen, K.; Barraza, J.; Kang, M.; Bieniosek, F.; Chow, K.; Fawley, W.; Henestroza, E.; Reginato, L.; Waldron, W.; Prichard, B.; Briggs, R.; Genoni, T.; Hughes, T.] Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Nielsen, K (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. EM knielsen@lanl.gov 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4141 EP 4143 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304297 ER PT B AU Prokop, M Kwon, S Torrez, P Ruggles, S AF Prokop, Mark Kwon, Sungil Torrez, Phillip Ruggles, Stephen GP IEEE TI LANSCE-R low level RF control system SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The Los Alamos Neutron Science Center (LANSCE) proton accelerator is scheduled for refurbishment. A new low level radio frequency (LLRF) system is part of the refurbishment plan since the existing LLRF system is analog-based and requires significant setup and maintenance time. Both field and resonance control aspects of the current system do not have the flexibility to meet future performance requirements. The LANSCE accelerator provides both H(+) and H(-) beams and due to the various user requirements there are a number of different beam pulse types varying in timing and current. In order to meet user needs, LANSCE must simultaneously transport both W and H- in the accelerator. These requirements have motivated the development of a new LLRF system based on software defined radio technology. The new system will include field control using feedback and adaptive feed forward techniques, an upgraded resonance controller with frequency agility to improve startup and fault recovery times and a high power amplifier pre-compensation controller for improved cavity fill times and amplifier efficiency. Among the challenges with implementing the new system are interfacing with existing subsystems of the accelerator. C1 [Prokop, Mark; Kwon, Sungil; Torrez, Phillip; Ruggles, Stephen] Los Alamos Natl Lab, Accelerator & Operat Div, RF Engn Grp, Los Alamos, NM 87544 USA. RP Prokop, M (reprint author), Los Alamos Natl Lab, Accelerator & Operat Div, RF Engn Grp, POB 1663, Los Alamos, NM 87544 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4144 EP 4146 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304298 ER PT B AU Reass, WA Gribble, RF AF Reass, William A. Gribble, Robert F. GP IEEE TI Improved tuning methods for converter-modulators SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The converter-modulator is a resonant power conditioning configuration that is optimized for a particular load impedance or parameter space. Although traction motor Insulated Gate Bipolar Transistors (IGBT's) are typically used for hard-switching application in the 1 kHz regime, the present use of high-power (10 - 15 NM converter-modulators have used a 20 kHz resonant switching topology. This presents design challenges to maintain efficient and reliable switching characteristics for the IGBT's. Improved tuning methods and circuit topological changes now offer a significant reduction in IGBT switching losses as compared to those used on the Spallation Neutron Source (SNS) design (perhaps by 10). These circuit and topology changes should also permit Pulse Width Modulation (PWM) of the modulator output voltage to provide a regulated voltage without anomalous IGBT switching characteristics. This paper will review the results of this investigation based on models developed from the SNS converter-modulator operational data. C1 [Reass, William A.; Gribble, Robert F.] Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Reass, WA (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4147 EP 4149 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304299 ER PT B AU Reass, WA Rees, DE Derenchuk, VP Rinckel, TC Visser, GJ AF Reass, William A. Rees, Daniel E. Derenchuk, Vladimir P. Rinckel, Thomas C. Visser, Gerard J. GP IEEE TI The Klystron RF systems for the Indiana University LENS accelerator SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB This paper describes the Klystron RF systems for the Indiana University Low Energy Neutron Source (LENS) waccelerator 425 MHz Radio Frequency Quadrupole (RFQ) and Drift Tube Linac (DTL) systems. Of interest in the power conditioning system is the design of the totem-pole grid-catch modulator for the mod-anode klystrons. This topology provides a fast rise and fall and closed loop regulation for the klystron. mod-anode to cathode voltage, which minimizes RF amplitude and phase droop while maximizing efficiency. Another advantage is that short pulse high rep-rate operation is viable within the average power capabilities of the klystron. The 425 MHz, 1.25 MW klystron amplifier chain will also be detailed. Of final interest, is the digital low level RF system. This provides vector control of the cavity field using direct conversion, non-I/Q sampling architecture, at a sampling rate of 132 MHz with a 12-bit analog-to-digital converter (ADC). Four input and two output channels are integrated into a 6 unit (6U) VME module, with all DSP functions performed in Xilinx Spartan-3 field-programmable gate arrays. The design and implementation of these systems, coupled with LENS operational results, will be presented. C1 [Reass, William A.; Rees, Daniel E.] Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. [Derenchuk, Vladimir P.; Rinckel, Thomas C.; Visser, Gerard J.] Indiana Univ, Bloomington, IN USA. RP Reass, WA (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. FU National Science Foundation [DMR-0220560, DMR-0320627]; Indiana University; Department of Defense FX Work supported by the National Science Foundation (grants DMR-0220560, DMR-0320627), the 21st Century Science and Technology fund of Indiana, Indiana University , and the Department of Defense. NR 6 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4150 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304300 ER PT B AU Reass, WA Burkhart, C Adolphsen, C Beukers, T Cassel, R de Lira, A Papas, C Nguyen, M Swent, R Anderson, DE AF Reass, William A. Burkhart, C. Adolphsen, C. Beukers, T. Cassel, R. de Lira, A. Papas, C. Nguyen, M. Swent, R. Anderson, David E. GP IEEE TI Converter-modulator design and operations for the "ILC" L-band test stand SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB To facilitate a rapid response to the International Linear Collider (ELC) L-band development program at SLAC, a spare conveiter-modulator was shipped from LANL. This modulator was to be a spare for the Spallation Neutron Source (SNS) accelerator at ORNL. The ELC application requires a 33% higher peak output power (15 MW) and output current (120 Amp). This presents significant design challenges to modify the existing hardware and yet maintain switching parameters and thermal cycling within the semiconductor component ratings. To minimize IGBT commutation and freewheeling diode currents, a different set of optimizations, as compared to the SNS design, were used to tune the resonant switching networks. Additional complexities arose as nanocrystalline cores with different performance characteristics (as compared to SNS), were used to fabricate the resonant "boost" transformers. This paper will describe the electrical design, modelling efforts, and resulting electrical performance as implemented for the ILC L-band test stand. C1 [Reass, William A.] Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. [Burkhart, C.; Adolphsen, C.; Beukers, T.; Cassel, R.; de Lira, A.; Papas, C.; Nguyen, M.; Swent, R.] SLAC, Menlo Pk, CA USA. [Anderson, David E.] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Reass, WA (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. FU NNSA, U. S. Department of Energy [DE-AC52-06NA25396] FX Work supported by the NNSA, U. S. Department of Energy under contract DE-AC52-06NA25396. NR 1 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4153 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304301 ER PT B AU Rees, D Bolme, G Bradley, J Kwon, S Lyles, J Lynch, M Prokop, M Reass, W Young, K AF Rees, D. Bolme, G. Bradley, J. Kwon, S. Lyles, J. Lynch, M. Prokop, M. Reass, W. Young, K. GP IEEE TI LANSCE RF system refurbishment SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The Los Alamos Neutron Science Center (LANSCE) is in the planning phase of a refurbishment project that win sustain reliable facility operations well into the next decade. The LANSCE accelerator was constructed in the late 1960s and early 1970s and is a national user facility that provides pulsed protons and spallation neutrons for defense and civilian research and applications. The refurbishment will focus on systems that are approaching "end of life" and systems where modern upgrades hold the promise for significant operating cost savings. The current baseline consist of replacing all the 201 MHz RF systems, upgrading a substantial fraction of the 805 MHz RF systems to high efficiency klystrons, replacing the high voltage systems, and replacing the low level RF cavity field control systems. System designs will be presented. The performance improvements will be described and the preliminary cost and schedule estimates will be discussed. C1 [Rees, D.; Bolme, G.; Bradley, J.; Kwon, S.; Lyles, J.; Lynch, M.; Prokop, M.; Reass, W.; Young, K.] Los Alamos Natl Lab, Los Alamos, NM 87544 USA. RP Rees, D (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87544 USA. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4156 EP 4158 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304302 ER PT B AU Smirnova, E Carlsten, B Earley, L Haynes, B AF Smirnova, Evgenya Carlsten, Bruce Earley, Lawrence Haynes, Brian GP IEEE TI Design and initial testing of omniguide traveling-wave tube structures SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB We propose to use the photonic band gap (PBG) structures for the construction of a wide-band traveling-wave tube (TWT) at W-band. Interest in millimeter-waves has increased in recent years due to applications in communications, remote sensing, and basic research. The development of wide-band mm-wave TWT amplifiers is underway at Los Alamos National Laboratory. PBG TWT structures have great potential for very large bandwidth and linear dispersion. In addition, being cheap to fabricate, PBG structures enhance the commercial transferability of the W-band TWT technology. We employ an omniguide which is a one-dimensional version of a PBG structure representing a periodic system of concentric dielectric tubes as a slow-wave structure. A silica omniguide was designed to support the TMDI-like mode with a phase velocity matching the one of the 120keV electron beam. The structure was fabricated, cold-tested and will be installed in our laboratory for the hot test. C1 [Smirnova, Evgenya; Carlsten, Bruce; Earley, Lawrence; Haynes, Brian] Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Smirnova, E (reprint author), Los Alamos Natl Lab, MS H851,POB 1663, Los Alamos, NM 87545 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4159 EP 4161 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304303 ER PT B AU Canabal, A Bowyer, JD Chacon, P Gillespie, NA Madrid, MA Tajima, T AF Canabal, A. Bowyer, J. D. Chacon, P. Gillespie, N. A. Madrid, M. A. Tajima, T. GP IEEE TI Development of a temperature mapping system for 1.3-GHz 9-cell SRF cavities SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The mapping of outer wall temperature during the vertical test of a superconducting radio-frequency (SRF) cavity has been one of the most useful tools to detect bad spots of the cavity. However, few systems except a rotating-arm type one have been developed so far for 9-cell cavities. Since it will be an essential tool to identify the failure of the cavities, we started to develop a fixed-board-type temperature mapping system that will enable us to map the temperature of 9-cell cavities in a much shorter time than rotating-arm type. This paper describes the design, status of the development and preliminary tests of the design. C1 [Canabal, A.; Bowyer, J. D.; Chacon, P.; Gillespie, N. A.; Madrid, M. A.; Tajima, T.] Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Canabal, A (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. EM acanabal@lanl.gov NR 8 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4162 EP 4164 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304304 ER PT B AU Harden, T Borden, M Canabal, A Pittman, P TaJima, T AF Harden, T. Borden, M. Canabal, A. Pittman, P. Tajima, T. GP IEEE TI Pre-conceptual design of automated systems for SRF cavity assembly and optical inspection SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The International Linear Collider (ILC) will require similar to 20,000 Superconducting Radio-Frequency (SRF) cavities. Improving the yield of high-gradient (>35 MV/m) cavities is currently one of the most critical issues for the ILC. LANL has been tasked to analyze SRF cavity failure and feedback the results to industry and academia. We have started a pre-conceptual design of an automated system for assembling and sealing the flanges on SRF cavities after high-pressure rinsing in a clean room. This should reduce particle contamination due to touch labor. We have also started a pre-conceptual design of an automated system to optically inspect precise locations (determined during testing) on the inner surface of SRF cavities for defects or contamination. This inspection will allow us to understand why a particular SRF cavity is substandard and potentially repair it. Using both automated systems should lead to field emission free cavities and higher yield of high-gradient cavities. C1 [Harden, T.; Borden, M.; Canabal, A.; Pittman, P.; Tajima, T.] Los Alamos Natl Lab, Los Alamos, NM 87544 USA. RP Harden, T (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87544 USA. EM harden@lanl.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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4165 EP 4167 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304305 ER PT B AU Young, JK Bolme, G Lyles, J Lynch, M Partridge, E Rees, D AF Young, J. K. Bolme, G. Lyles, J. Lynch, M. Partridge, E. Rees, D. GP IEEE TI LANSCE 201 MHz and 805 MHz RF system experience SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The LANSCE RF system consists of four RF stations at 201 MHz and forty-four klystrons at 805 MHz. In the LANSCE accelerator, the beam source is injected into the RF system at 0.75 MeV. The beam is then accelerated to 100 MeV in four drift tube linac (DTL) tanks, driven at 201.25 MHz. Each 201 MHz; RF system consists of a train of ampffiers, including a solid state amplifier, a tetrode, and a triode. After the DTL, the beam is accelerated from 100 MeV to 800 MeV in the forty-four coupled cavity linac (CCL) tanks at 805 MHz. The machine operates with a normal RF pulse width of 835 microseconds at a repetition rate up to 120 Hz, and sometimes operates with a pulse width up to 1.2 milliseconds at 1 Hz. This RF system has been operating for about 37 years. This paper summarizes the recent operational experience. The reliability of the 805 MHz and 201 MHz RF systems is discussed, and a summary the lifetime data of the 805 MHz klystrons and 201 MHz triodes is presented. C1 [Young, J. K.; Bolme, G.; Lyles, J.; Lynch, M.; Partridge, E.; Rees, D.] Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Young, JK (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4168 EP 4170 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304306 ER PT B AU Akre, R Dowell, D Emma, P Frisch, J Hong, B Kotturi, K Krejcik, P Wu, J Byrd, J AF Akre, R. Dowell, D. Emma, P. Frisch, J. Hong, B. Kotturi, K. Krejcik, P. Wu, J. Byrd, J. GP IEEE TI LCLS LLRF upgrades to the SLAC linac SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The Linac Coherent Light Source (LCLS) at SLAC will be the brightest X-ray laser in the world when it comes on line. In order to achieve the brightness a 200fS length electron bunch is passed through an undulator. To create the 200fS, 3kA bunch, a 10pS electron bunch, created from a photo cathode in an RF gun, is run off crest on the RF to set up a position to energy correlation. The bunch is then compressed by chicanes. The stability of the RF system is critical in setting up the position to energy correlation. Specifications derived from simulations require the RF system to be stable to below 200fS in several critical injector stations and the last kilometer of linac. The SLAC linac RF system is being upgraded to meet these requirements. C1 [Akre, R.; Dowell, D.; Emma, P.; Frisch, J.; Hong, B.; Kotturi, K.; Krejcik, P.; Wu, J.] SLAC, Menlo Pk, CA 94025 USA. [Byrd, J.] LBNL, Berkeley, CA 94720 USA. RP Akre, R (reprint author), SLAC, Menlo Pk, CA 94025 USA. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4177 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304309 ER PT B AU Bane, KLF Adolphsen, C Nantista, C AF Bane, K. L. F. Adolphsen, C. Nantista, C. GP IEEE TI RF distribution optimization in the main linacs of the ILC SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE C1 [Bane, K. L. F.; Adolphsen, C.; Nantista, C.] Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Bane, KLF (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. 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 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4180 EP 4182 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304310 ER PT B AU Dolgashev, V Borland, M Waldshmidt, G AF Dolgashev, Valery Borland, Michael Waldshmidt, Geoff GP IEEE TI RF design of normal conducting deflecting structures for the Advanced Photon Source SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Use of normal conducting deflecting structures for production of short x-ray pulses is now under consideration at Argonne's Advanced Photon Source (APS). The structures have to produce up to 4 MV maximum deflection per pair of structures with a 1 kHz repetition rate. At the same time, the structures should not cause deterioration of beam properties in the APS ring. Following these requirements, we proposed 2815 MHz standing wave deflecting structures with heavy wakefield damping. In this paper we discuss design considerations and present our current design. C1 [Dolgashev, Valery] SLAC, Menlo Pk, CA 94025 USA. [Borland, Michael; Waldshmidt, Geoff] Argonne Natl Lab, Argonne, IL 60439 USA. RP Dolgashev, V (reprint author), SLAC, Menlo Pk, CA 94025 USA. FU U.S. Department of Energy [W-31-109-ENG-38]; [DE-AC02-76SF00515] FX *Work supported by the U.S. Department of Energy Contracts W-31-109-ENG-38 and DE-AC02-76SF00515. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4183 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304311 ER PT B AU Dolgashev, VA Tantawi, SG Nantista, CD Higashi, Y Higo, T AF Dolgashev, V. A. Tantawi, S. G. Nantista, C. D. Higashi, Y. Higo, T. GP IEEE TI High power tests of normal conducting single-cell structures SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB We report the results of the first high power tests of single-cell traveling-wave and standing-wave structures. These tests are part of an experimental and theoretical study of rf breakdown in normal conducting structures at 11.4 GHz [1]. The goal of this study is to determine the gradient potential of normal-conducting rf-powered particle beam accelerators. The test setup consists of reusable mode converters and short test structures and is powered by SLAC's XL-4 klystron. This setup was created for economical testing of different cell geometries, cell materials and preparation techniques with short turn-around time. The mode launchers and structures were manufactured at SLAC and KEK and tested in the SLAC Klystron Test Lab. C1 [Dolgashev, V. A.; Tantawi, S. G.; Nantista, C. D.] SLAC, Menlo Pk, CA USA. [Higashi, Y.; Higo, T.] KEK, Tsukuba, Ibaraki 305, Japan. RP Dolgashev, VA (reprint author), SLAC, Menlo Pk, CA USA. FU U.S. Department of Energy [DE-AC02-76SF00515] FX This work was supported by the U.S. Department of Energy contract DE-AC02-76SF00515. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4186 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304312 ER PT B AU Guoo, JQ Tantawi, S AF Guoo, Jiquan Tantawi, Sami GP IEEE TI Active RF pulse compression using electrically controlled semiconductor switches SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE ID RESONANT DELAY-LINES AB In this paper, we will present our recent results on the research of the ultra-fast high power RF switches based on silicon. We have developed a switch module at X-band which can use a silicon window as the switch. The switching is realized by generation of carriers in the bulk silicon. The carriers can be generated electrically or/and optically. The electrically controlled switches use PIN diodes to inject carrier. We have built the PIN diode switches at X-band, with <300ns switching time. The optically controlled switches use powerful lasers to excite carriers. By combining the laser excitation and electrical carrier generation, significant reduction in the required power of both the laser and the electrical driver is expected. High power test is under going. C1 [Guoo, Jiquan; Tantawi, Sami] SLAC, Menlo Pk, CA 94025 USA. RP Guoo, JQ (reprint author), SLAC, Menlo Pk, CA 94025 USA. EM jqguo@slac.stanford.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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4189 EP 4191 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304313 ER PT B AU Ge, L Adolphsen, C Ko, LK Li, Z Ng, C Schussman, G Wang, F Rusnak, B AF Ge, L. Adolphsen, C. Ko, L. K. Li, Z. Ng, C. Schussman, G. Wang, F. Rusnak, B. GP IEEE TI Multipacting simulations of TTF-III power coupler components SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The TTF-III power coupler adopted for the ILC baseline cavity design has shown a tendency to have long initial high power processing time. A possible cause for the long processing time is believed to be multipacting in various regions of the coupler. To understand performance limitations during high power processing, SLAC has built a flexible high-power coupler test stand. The plan is to test individual sections of the coupler, which includes the cold and warm coaxes, the cold and warm bellows, and the cold window, using the test stand to identify problematic regions. To provide insights for the high power test, detailed numerical simulations of multipacting for these sections will be performed using the 3D multipacting code Track3P. C1 [Ge, L.; Ko, L. K.; Li, Z.; Ng, C.; Schussman, G.; Wang, F.] SLAC, Menlo Pk, CA 94025 USA. [Rusnak, B.] LLNL, Livermore, CA 94550 USA. RP Ge, L (reprint author), SLAC, Menlo Pk, CA 94025 USA. EM lge@slac.stanford.edu FU U.S. DOE ASCR, BES,; HEP Divisions [DE-AC02-76SF00515]; NCCS at ORNL; Office of Science of the U.S. DOE [DE-AC05-00OR22725]; NERSC at LBNL; U.S. DOE [DE- AC03-76SF00098]; U. S. Department of Energy by the University of California, Lawrence Livermore National Laboratory [W-7405-Eng-48] FX Work supported by the U.S. DOE ASCR, BES, and HEP Divisions under contract No. DE-AC02-76SF00515. The work used the resources of NCCS at ORNL which is supported by the Office of Science of the U.S. DOE under Contract No. DE-AC05-00OR22725, and the resources of NERSC at LBNL which is supported by the Office of Science of the U.S. DOE under Contract No. DE- AC03-76SF00098.; This work was performed under the auspices of the U. S. Department of Energy by the University of California, Lawrence Livermore National Laboratory under Contract No. W-7405-Eng-48. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4192 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304314 ER PT B AU Nantista, C Adolphsen, C Bowden, G Swent, R Mckee, B AF Nantista, Christopher Adolphsen, Chris Bowden, Gordon Swent, Richard Mckee, Bobby GP IEEE TI An RF waveguide distribution system for the ILC test accelerator at Fermilab's NML SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB An ILC R&D facility is being constructed in the NML building at Fermilab which, in addition to an injector and beam dump with spectrometer, will contain up to three cryomodules of ILC-type superconducting 9-cell cavities. This linac will be powered by a single klystron. As part of SLAC's contribution to this project, we will provide a distribution network in WR650 waveguide to the various cavity couplers. In addition to commercial waveguide components and circulators and loads, this system will include adjustable tap-offs, and customized hybrids. In one configuration, the circulators will be removed to test pair-wise cancellation of cavity reflections through hybrids. The system will be pressurized with nitrogen to 3 bar absolute to avoid the need for SF(6). The full distribution system for the first cryomodule will be delivered and installed later this year. We describe the design of the system and completed RF testing. C1 [Nantista, Christopher; Adolphsen, Chris; Bowden, Gordon; Swent, Richard; Mckee, Bobby] SLAC, Menlo Pk, CA 94025 USA. RP Nantista, C (reprint author), SLAC, Menlo Pk, CA 94025 USA. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4198 EP 4200 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304316 ER PT B AU Nguyen, MN Cassel, RL AF Nguyen, M. N. Cassel, R. L. GP IEEE TI High power switch for the SMTF modulator SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB A compact, water cooled, high power switch for the Superconducting Module Test Facility (SMTF) long-pulse klystron modulator has been constructed and implemented at the Fermi National Accelerator Laboratory (FNAL). This solid-state switch is composed of six series devices, each having a rating of 4.5 kV and 2000 Adc. Latest generation, press-pack IGBT modules are utilized to reduce the physical size and complexity of the switch assembly. The new switch and its associated controller provide a high degree of redundancy and fail-safe operation, which meets the modulator requirements. This paper describes the general switch assembly, IGBT protection and control schemes, and test results. C1 [Nguyen, M. N.; Cassel, R. L.] Stanford Linear Accelerator Ctr, Menlo Pk, CA 94025 USA. RP Nguyen, MN (reprint author), Stanford Linear Accelerator Ctr, 2575 Sand Hill Rd, Menlo Pk, CA 94025 USA. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4201 EP 4203 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304317 ER PT B AU Fox, JD Mastorides, T Rivetta, CH Van Winkle, D AF Fox, John D. Mastorides, Themis Rivetta, Claudio Hector Van Winkle, Daniel GP IEEE TI Selecting RF amplifiers for impedance controlled LLRF systems - Nonlinear effects and system implications SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Several high-current accelerators use feedback techniques in the accelerating RF systems to control the impedances seen by the circulating beam. [1, 2] These Direct and Comb Loop architectures put the high power klystron and LLRF signal processing components inside feedback loops, and the ultimate behavior of the systems depends on the individual sub-component properties. Imperfections and non-idealities in the signal processing leads to reduced effectiveness in the impedance controlled loops. In the PEP-II LLRF systems non-linear effects have been shown to reduce the achievable beam currents, increase low-mode longitudinal growth rates and reduce the margins and stability of the LLRF control loops. We present measurements of the driver amplifiers used in the PEP-II systems, and present measurement techniques needed to quantify the small-signal gain, linearity, transient response and image frequency generation of these amplifiers. C1 [Fox, John D.; Mastorides, Themis; Rivetta, Claudio Hector; Van Winkle, Daniel] Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Fox, JD (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94309 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4207 EP 4209 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304319 ER PT B AU Xiao, L Adolphsen, C Akcelik, V Kabel, A Ko, K Lee, L Li, Z Ng, C AF Xiao, L. Adolphsen, C. Akcelik, V. Kabel, A. Ko, K. Lee, L. Li, Z. Ng, C. GP IEEE TI Modelling imperfection effects on dipole modes in Tesla cavity SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The actual cell shapes of the TESLA cavities differ from the ideal due to fabrication errors, the addition of stiffening rings and the frequency tuning process. Cavity imperfection shifts the dipole mode frequencies and alters the Qext's from those computed for the ideal cavity. Qext increase could be problematic if its value exceeds the limit required for ILC beam stability. To study these effects, a cavity imperfection model was established using a mesh distortion method. The eigensolver Omega3P was then used to find the critical dimensions that contribute to the Qext spread and frequency shift by comparing predictions to TESLA cavity measurement data. Using the imperfection parameters obtained from these studies, fiducial cavity imperfection models are generated for the studies of wakefields. C1 [Xiao, L.; Adolphsen, C.; Akcelik, V.; Kabel, A.; Ko, K.; Lee, L.; Li, Z.; Ng, C.] SLAC, Menlo Pk, CA 94025 USA. RP Xiao, L (reprint author), SLAC, Menlo Pk, CA 94025 USA. EM liling@slac.stanford.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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4210 EP 4212 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304320 ER PT B AU Xiao, L Ko, K Li, Z Ng, C Schussman, G Seryi, A Uplenchwar, R Burt, G Goudket, P McIntosh, P Bellantoni, L AF Xiao, L. Ko, K. Li, Z. Ng, C. Schussman, G. Seryi, A. Uplenchwar, R. Burt, G. Goudket, P. McIntosh, P. Bellantoni, L. GP IEEE TI g HOM and LOM coupler optimizations for the ILC crab cavity SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The FNAL 9-cell 3.9 GHz deflecting cavity designed for the CKM experiment was chosen as the baseline design for the ILC BDS crab cavity. Effective damping is required for the lower-order TM010 modes (LOM), the same-order TM110 pi-mode (SOM) as well as the higher-order modes (HOM) to minimi e the beam loading and beam centroid steering due to wakefields. Simulation results of the original CKM design using the eigensolver Omega3P showed that both the notch filters of the HOM/LOM couplers are too sensitive to the notch gap, and the damping of the SOM is insufficient for the ILC. To meet the ILC requirements, the couplers were redesigned to improve the damping and tuning sensitivity. With the new design, the damping of the LOW/SOM/HOM modes is significantly improved, the sensitivity of the notch filter for the HOM coupler is reduced by one order of magnitude and mechanically feasible, and the LOM coupler is simplified by aligning it on the same plane as the SOM coupler and by eliminating the notch filter. In this paper, we will present the coupler optimization, tolerance studies and multipacting analysis for the crab cavity. C1 [Xiao, L.; Ko, K.; Li, Z.; Ng, C.; Schussman, G.; Seryi, A.; Uplenchwar, R.] SLAC, Menlo Pk, CA USA. [Goudket, P.; McIntosh, P.] STFC, ASTeC, DL, Warrington, Cheshire, England. [Bellantoni, L.] Fermilab Natl Accelerator Lab, Batavia, IL USA. [Burt, G.] Cockcroft Inst, Lancaster, England. RP Xiao, L (reprint author), SLAC, Menlo Pk, CA USA. EM liling@slac.stanford.edu FU DOE ASCR, BES; HEP Divisions [DE-AC02-76SF00515]; NCCS at ORNL; Office of Science of the U.S. DOE [DE-AC05-00OR22725]; NERSC at LBN; [DE- AC03-76SF00098] FX Work is supported by DOE ASCR, BES and HEP Divisions under contract DE-AC02-76SF00515. The work used the resources of NCCS at ORNL.; which is supported by the Office of Science of the U.S. DOE under Contract No. DE-AC05-00OR22725, and the resources of NERSC at LBN.; which is supported by the Office of Science of the U.S. DOE under Contract No. DE- AC03-76SF00098. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4213 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304321 ER PT B AU Shu, QS Susta, J Cheng, GF Phipps, I Selim, R Mast, J Kneisel, P Myneni, G Ben-Zvi, I AF Shu, Q. -S. Susta, J. Cheng, G. F. Phipps, I. Selim, R. Mast, J. Kneisel, P. Myneni, G. Ben-Zvi, I. GP IEEE TI SQUID based non-destructive testing instrument of dished Nb sheets for SRF cavities SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The performance of superconducting RF cavities used in accelerators can be enhanced by detecting micro particles and inclusions which are the most serious source of performance degradation. These defects prevent the cavities from reaching the highest possible accelerating fields. We have developed a SQUID scanning system based on eddy current technique that allows the scanning of curved Nb samples. Ibis SQUID scanning system successfully located Tantalum defects about 100 mu m diameter in a flat Nb sample and was able to also locate the defects in a cylindrical surface sample. Most importantly, however, the system successfully located the defects on the backside of the flat sample and curved sample, both 3-mm thick. This system can be used for the inspection and detection of such defects during SRF cavity manufacturing. C1 [Shu, Q. -S.; Susta, J.; Cheng, G. F.; Phipps, I.] AMAC Int Inc, Newport News, VA 23606 USA. [Selim, R.; Mast, J.] Christopher Newport Univ, Newport News, VA 23606 USA. [Kneisel, P.; Myneni, G.] Jefferson Natl Lab, Newport News, VA 23606 USA. [Ben-Zvi, I.] Brookhaven Natl Lab, Upton, NY 11719 USA. RP Shu, QS (reprint author), AMAC Int Inc, Newport News, VA 23606 USA. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4225 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304325 ER PT B AU Shu, QS Susta, J Chen, GF Phipps, I Lu, FH Khabiboulline, T Solyak, N AF Shu, Q. S. Susta, J. Chen, G. F. Phipps, I. Lu, F. H. Khabiboulline, T. Solyak, N. GP IEEE TI Innovative modular, multiple power levels, 325 MHz spokes cavities power couplers SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB In order to increase the protons energy up to 8 GeV in a driver Linac, the particles must be accelerated through various stages and three different power levels (25kW, 100kW and 210kW) are required for the 325 MHz Fermilab Proton Driver couplers. The problem identified by the project is that no High RF power coupler for these cavities has ever been designed and produced using US industrial capabilities. AMAC proposed a novel resolution by development of innovative modular, multiple power levels, 325 MHz spoke cavities power couplers, which to meet three type cavities with one coupler design. The simulation and concept design are presented. The results of HFSS, MAFIA, ANSYS, and Multipacting are also discussed. C1 [Shu, Q. S.; Susta, J.; Chen, G. F.; Phipps, I.; Lu, F. H.] AMAC Inc, Newport News, VA 23606 USA. [Khabiboulline, T.; Solyak, N.] Fermi Lab, Batavia, IL 60510 USA. RP Shu, QS (reprint author), AMAC Inc, Newport News, VA 23606 USA. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4231 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304327 ER PT B AU Drury, M Daly, EF Davis, GK Fischer, J Grenoble, C Hicks, W Hogan, J King, L Nichols, R Plawski, T Preble, J Rothgeb, T Wang, H AF Drury, M. Daly, E. F. Davis, G. K. Fischer, J. Grenoble, C. Hicks, W. Hogan, J. King, L. Nichols, R. Plawski, T. Preble, J. Rothgeb, T. Wang, H. GP IEEE TI Performance of the first refurbished CEBAF cryomodule SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The Thomas Jefferson National Accelerator Facility has begun a cryomodule refurbishment project. The goal of this project is robust 6 GeV, 5 pass operation of the Continuous Electron Beam Accelerator Facility (CEBAF). The scope of the project includes removing, refurbishing and replacing 10 CEBAF cryomodules at a rate of three per year. Refurbishment includes reprocessing of SRF cavities to eliminate field emission and increase the nominal gradient from the original 5 MV/m to 12.5 MV/m. New "dogleg" couplers between the cavity and helium vessel flanges will intercept secondary electrons that produce arcing on the 2 K ceramic window in the Fundamental Power Coupler (FPC). Modification of the Qext of the FPC will allow higher gradient operations. Other changes include new ceramic RF windows for the air to vacuum interface of the FPC and improvements to the mechanical tuners. Any damaged or worn components will be replaced as well. Currently, the first of the refurbished cryomodules has been installed and tested both in the Cryomodule Test Facility and in place in the North Linac of CEBAF. This paper will summarize the results of these tests. C1 [Drury, M.; Daly, E. F.; Davis, G. K.; Fischer, J.; Grenoble, C.; Hicks, W.; Hogan, J.; King, L.; Nichols, R.; Plawski, T.; Preble, J.; Rothgeb, T.; Wang, H.] Jefferson Lab, Newport News, VA USA. RP Drury, M (reprint author), Jefferson Lab, 12000 Jefferson Ave, Newport News, VA 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4234 EP 4236 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304328 ER PT B AU Allison, T Delayen, J Hovater, C Musson, J Plawski, T AF Allison, T. Delayen, J. Hovater, C. Musson, J. Plawski, T. GP IEEE TI A digital self excited loop for accelerating cavity field control SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB We have developed a digital process that emulates an analog oscillator and ultimately a self excited loop (SEL) for field control. The SEL, in its analog form, has been used for many years for accelerating cavity field control. In essence the SEL uses the cavity as a resonant circuit - much like a resonant (tank) circuit is used to build an oscillator. An oscillating resonant circuit can be forced to oscillate at different, but close, frequencies to resonance by applying a phase shift in the feedback path. This allows the circuit to be phased-locked to a master reference, which is crucial for multiple cavity accelerators. For phase and amplitude control the SEL must be forced to the master reference frequency, and feedback provided for in both dimensions. The novelty of this design is in the way digital signal processing (DSP) is structured to emulate an analog system. While the digital signal processing elements are not new, to our knowledge this is the first time that the digital SEL concept has been designed and demonstrated. This paper reports on the progress of the design and implementation of the digital SEL for field control of superconducting accelerating cavities. C1 [Allison, T.; Delayen, J.; Hovater, C.; Musson, J.; Plawski, T.] TJNAF, Newport News, VA USA. RP Allison, T (reprint author), TJNAF, Newport News, VA USA. EM hovater@jlab.org 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4237 EP 4239 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304329 ER PT B AU Kneisel, P Ciovati, G Sekutowicz, J Matheisen, A Singer, X Singer, W AF Kneisel, P. Ciovati, G. Sekutowicz, J. Matheisen, A. Singer, X. Singer, W. GP IEEE TI Development of a superconducting connection for niobium cavities SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Several, partially successful attempts have been made in the past to develop a superconducting connection between adjacent niobium cavities with the capability to carry up to 30 mT of the magnetic flux. Such a connection would be particularly of great benefit to layouts of long accelerators like ILC because it would shorten the distances between structures and therefore the total length of an accelerator with the associated cost reductions. In addition the superconducting connection would be ideal for a super-structure - two multi-cell cavities connected through a half wavelength long beam pipe providing the coupling. Two welded prototypes of super-structure have been successfully tested with beam at DESY. The chemical treatment and water rinsing was rather complicated for these prototypes because of the length of the assembly. We have engaged in a program to develop such a connection, initially based on the Nb55Ti material. Several options are pursued e.g. a two-cell cavity is being used to explore the reachable magnetic flux for the TESLA like connection with a squeezed niobium gasket between the flanges. Other materials, such as NbZr or NbN are also being considered. In this contribution, we will report about the progress of our investigations. C1 [Kneisel, P.; Ciovati, G.; Sekutowicz, J.] TJNAF, Newport News, VA USA. [Matheisen, A.; Singer, X.; Singer, W.] DESY, Hamburg, Germany. RP Kneisel, P (reprint author), TJNAF, Newport News, VA USA. EM kneisel@jlab.org 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4240 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304330 ER PT B AU Kneisel, P Ciovati, G Bundy, R Clemens, B Forehand, D Golden, B Manning, S Manus, B Marhauser, F Overton, R Rimmer, RA Slack, G Turlington, L Wang, H AF Kneisel, P. Ciovati, G. Bundy, R. Clemens, B. Forehand, D. Golden, B. Manning, S. Manus, B. Marhauser, F. Overton, R. Rimmer, R. A. Slack, G. Turlington, L. Wang, H. GP IEEE TI Preliminary results from prototype niobium cavities for the Jlab Ampere-class FEL SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB In a previous paper the cavity [1] design for an Ampere-class cryomodule was introduced. We have since fabricated a 1500 MHz version of a single cell cavity with waveguide couplers for HOM and fundamental power, attached to one end of the cavity, a 5-cell cavity made from large grain niobium without couplers and. a 750 MHz single cell cavity without endgroups to get some information about obtainable Q-values, gradients and multipacting behavior at lower frequency. This contribution reports on the various tests of these cavities. C1 [Kneisel, P.; Ciovati, G.; Bundy, R.; Clemens, B.; Forehand, D.; Golden, B.; Manning, S.; Manus, B.; Marhauser, F.; Overton, R.; Rimmer, R. A.; Slack, G.; Turlington, L.; Wang, H.] Jefferson Lab, Newport News, VA 23606 USA. RP Kneisel, P (reprint author), Jefferson Lab, 12000 Jefferson Ave, Newport News, VA 23606 USA. EM kneisel@jlab.org 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4243 EP 4245 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304331 ER PT B AU Allison, T Davis, K Dong, H Hovater, C King, L Musson, J Plawski, T AF Allison, T. Davis, K. Dong, H. Hovater, C. King, L. Musson, J. Plawski, T. GP IEEE TI CEBAF new digital LLRF system extended functionality SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The new digital LLRF system for the CEBAF 12GeV accelerator will perform a variety of tasks, beyond field control [1]. In this paper we present the superconducting cavity resonance control system designed to minimize RF power during gradient ramp and to minimize RF power during steady state operation. Based on the calculated detuning angle, which represents the difference between reference and cavity resonance frequency, the cavity length will be adjusted with a mechanical tuner. The tuner has two mechanical driving devices, a stepper motor and a piezo-tuner, to yield a combination of coarse and fine control. Although LLRF piezo processing speed can achieve 10 kHz bandwidth, only 10 Hz speed is needed for 12 GeV upgrade. There will be a number of additional functions within the LLRF system; heater controls to maintain cryomodule's heat load balance, ceramic window temperature monitoring, waveguide vacuum interlocks, ARC detector interlock and quench detection. The additional functions will be divided between the digital board, incorporating an Altera FPGA and an embedded EPICS IOC. This paper will also address hardware evolution and test results performed with different SC cavities. C1 [Allison, T.; Davis, K.; Dong, H.; Hovater, C.; King, L.; Musson, J.; Plawski, T.] Jefferson Lab, Newport News, VA 23606 USA. RP Allison, T (reprint author), Jefferson Lab, Newport News, VA 23606 USA. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4246 EP 4248 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304332 ER PT B AU Rimmer, RA Bundy, R Cheng, G Ciovati, G Daly, EF Getz, R Henry, J Hicks, WR Kneisel, P Manning, S Manus, R Marhauser, F Smith, K Stirbet, M Turlington, L Vogel, L Wang, H Wilson, KM AF Rimmer, R. A. Bundy, R. Cheng, G. Ciovati, G. Daly, E. F. Getz, R. Henry, J. Hicks, W. R. Kneisel, P. Manning, S. Manus, R. Marhauser, F. Smith, K. Stirbet, M. Turlington, L. Vogel, L. Wang, H. Wilson, K. M. GP IEEE TI JLab high-current CW cryomodules for ERL and FEL applications SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB We describe the activities underway at JLab to develop new CW cryomodules capable of transporting up to Ampere-levels of beam currents for use in ERLs and FELs. Goals include an efficient cell shape, high packing factor for efficient real-estate gradient and very strong HOM damping to push BBU thresholds up by two or more orders of magnitude compared to existing designs. Cavity shape, HOM damping and ancillary components are optimized for this application. Designs are being developed for low-frequency (750 MHz), Ampere-class compact FELs and for high-frequency (1.5 GHz), 100 mA configurations. These designs and concepts can easily be scaled to other frequencies. We present the results of conceptual design studies, simulations and prototype measurements. These modules are being developed for the next generation ERL based high power FELs but may be useful for other applications such as high energy light sources, electron cooling, electron-ion colliders, industrial processing etc. C1 [Rimmer, R. A.; Bundy, R.; Cheng, G.; Ciovati, G.; Daly, E. F.; Getz, R.; Henry, J.; Hicks, W. R.; Kneisel, P.; Manning, S.; Manus, R.; Marhauser, F.; Smith, K.; Stirbet, M.; Turlington, L.; Vogel, L.; Wang, H.; Wilson, K. M.] JLAB, Newport News, VA 23606 USA. RP Rimmer, RA (reprint author), JLAB, Newport News, VA 23606 USA. EM RARinuner@jlab.ore 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4249 EP 4251 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304333 ER PT B AU Wang, HP Rimmer, R Marhauser, F AF Wang, Haipeng Rimmer, Robert Marhauser, Frank GP IEEE TI Simulations and measurements of a heavily HOM-damped multi-cell SRF cavity SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB After an initial cavity shape optimization [1] and cryomodule development [2] for an Ampere-class FEL ERL, we have simulated a complete 5-cell high-current (HQ cavity structure with six waveguide (WG) couplers for Higher Order Mode (HOM) damping and fundamental power coupling. MAFIA time-domain wakefield simulations have been used to calculate the cavities broadband HOM impedance spectra. Microwave Studio (MWS) has been used in addition to evaluate the external Q of the fundamental power coupler (FPC) and the R/Qs of the HOMs. A half scale 1497MHz single-cell model cavity and a 5-cell copper cavity including dummy HOM WG loads were fabricated to bench measure and confirm the design performance. Details of the multi-beam wakefield simulations, the HOM damping measurements and multi-peak data fitting analysis techniques are presented. C1 [Wang, Haipeng; Rimmer, Robert; Marhauser, Frank] TJNAF, Newport News, VA 23606 USA. RP Wang, HP (reprint author), TJNAF, Newport News, VA 23606 USA. EM haipeng@jlab.org 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4252 EP 4254 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304334 ER PT B AU BastaniNejad, M Elmustafa, AA Ankenbrandt, CM Moretti, A Popovic, M Yonehara, K Kaplan, DM Alsharo'a, M Hanlet, PM Johnson, RP Kuchnir, M Newsham, D AF BastaniNejad, M. Elmustafa, A. A. Ankenbrandt, C. M. Moretti, A. Popovic, M. Yonehara, K. Kaplan, D. M. Alsharo'a, M. Hanlet, P. M. Johnson, R. P. Kuchnir, M. Newsham, D. GP IEEE TI Evidence for Fowler-Nordheim behavior in RF breakdown SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE ID EMISSION AB Microscopic images of the surfaces of metallic electrodes used in high-pressure gas-filled 805 MHz RF cavity experiments are used to investigate the mechanism of RF breakdown. The images show evidence for melting and boiling in small regions of similar to 10 micron diameter on tungsten, molybdenum, and beryllium electrode surfaces. In these experiments, the dense hydrogen gas in the cavity prevents electrons or ions from being accelerated to high enough energy to participate in the breakdown process so that the only important variables are the fields and the metallic surfaces. The distributions of breakdown remnants on the electrode surfaces are compared to the maximum surface gradient E predicted by an ANSYS model of the cavity. The local surface density of spark remnants, proportional to the probability of breakdown, shows a power law dependence on the maximum gradient, with E-10 for tungsten, E-11.5 for molybdenum, and E 7 for beryllium. This strong E dependence is reminiscent of Fowler-Nordheim behaviour [1] of electron emission from a cold cathode, which is explained by the quantum-mechanical penetration of a barrier that is characterized by the work function of the metal. C1 [BastaniNejad, M.; Elmustafa, A. A.] ODU, Norfolk, VA USA. [Ankenbrandt, C. M.; Moretti, A.; Popovic, M.; Yonehara, K.] Fermi Lab, Chicago, IL USA. [Kaplan, D. M.] IIT, Chicago, IL USA. [Alsharo'a, M.; Hanlet, P. M.; Johnson, R. P.; Kuchnir, M.; Newsham, D.] Muons Inc, Batavia, IL USA. RP BastaniNejad, M (reprint author), ODU, Norfolk, VA USA. EM Mahzad@jlab.org FU DOE STTR [DE-FG02-05ER86252] FX Supported in part by DOE STTR grant DE-FG02-05ER86252. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4255 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304335 ER PT B AU Campisi, IE Assadi, S Casagrande, F Crofford, M Dodson, G Galambos, J Giannella, M Henderson, S Howell, M Kang, Y Kasemir, K Kim, SH Kursun, Z Ladd, P Ma, H Stout, D Strong, W Zhang, Y Champion, M AF Campisi, I. E. Assadi, S. Casagrande, F. Crofford, M. Dodson, G. Galambos, J. Giannella, M. Henderson, S. Howell, M. Kang, Y. Kasemir, K. Kim, S. H. Kursun, Z. Ladd, P. Ma, H. Stout, D. Strong, W. Zhang, Y. Champion, M. GP IEEE TI Status and performance of the spallation neutron source superconducting linac SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The Superconducting Linac at SNS has been operating with beam for almost two years. As the first operational pulsed superconducting linac, many of the aspects of its performance were unknown and unpredictable. A lot of experience has been gathered during the commissioning of its components, during the beam turn on and during operation at increasingly higher beam power. Some cryomodules have been cold for well over two years and have been extensively tested. The operation has been consistently conducted at 4.4 K and 10 and 15 pulses per second, with some cryomodules tested at 30 and 60 Hz and some tests performed at 2 K. Careful balance between safe operational limits and the study of conditions, parameters and components that create physical limits has been achieved. C1 [Campisi, I. E.; Assadi, S.; Casagrande, F.; Crofford, M.; Dodson, G.; Galambos, J.; Giannella, M.; Henderson, S.; Howell, M.; Kang, Y.; Kasemir, K.; Kim, S. H.; Kursun, Z.; Ladd, P.; Ma, H.; Stout, D.; Strong, W.; Zhang, Y.] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. [Champion, M.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Campisi, IE (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. EM cie@ornl.gov FU UT-Battelle, LLC [DE-AC05-00OR22725] FX SNS is managed by UT-Battelle, LLC, under contract DE-AC05- 00OR22725 for the U.S. Department of Energy . 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4258 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304336 ER PT B AU Kang, YW Vassioutchenko, A Aleksandrov, AV Anderson, D Champion, MS Crofford, M Gibson, P Hardek, T Ladd, P McCarthy, MP Stout, D AF Kang, Y. W. Vassioutchenko, A. Aleksandrov, A. V. Anderson, D. Champion, M. S. Crofford, M. Gibson, P. Hardek, T. Ladd, P. McCarthy, M. P. Stout, D. GP IEEE TI Design and high power processing of RFQ input power couplers SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB A RF power coupling system has been developed for future upgrade of input coupling of the RFQ in the SNS linac. The design employs two coaxial loop couplers for 402.5 MHz operation. Each loop is fed through a coaxial ceramic window that is connected to an output of a magic-T waveguide hybrid through a coaxial to waveguide transition. The coaxial loop couplers are designed, manufactured, and high power processed. Two couplers will be used in parallel to power the accelerating structure with up to total 800 kW peak power at 6% duty cycle. RF and mechanical properties of the couplers are discussed. Result of high power RF conditioning that is performed in the RF test facility of the SNS is presented. C1 [Kang, Y. W.; Vassioutchenko, A.; Aleksandrov, A. V.; Anderson, D.; Champion, M. S.; Crofford, M.; Gibson, P.; Hardek, T.; Ladd, P.; McCarthy, M. P.; Stout, D.] Oak Ridge Natl Lab, Oak Ridge, TN USA. RP Kang, YW (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN USA. NR 4 TC 0 Z9 0 U1 1 U2 3 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4261 EP 4263 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304337 ER PT B AU Kang, YW Wilson, JL Champion, M Hardek, T Kim, SH McCarthy, M Vassioutchenko, A AF Kang, Y. W. Wilson, J. L. Champion, M. Hardek, T. Kim, S-H. McCarthy, M. Vassioutchenko, A. GP IEEE TI Development and testing of high power RF vector modulators SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB A fan-out RF power distribution system can allow many accelerating cavities to be powered by a single high-power klystron amplifier. High-power vector modulators can perform independent control of amplitudes and phases of RF voltages at the cavities without changing the klystron signal. A prototype high-power RF vector modulator employing a quadrature hybrid and two ferrite phase shifters in coaxial TEM transmission lines has been built and tested for 402.5 MHz. RF properties of the design and results of high power testing are presented. C1 [Kang, Y. W.; Wilson, J. L.; Champion, M.; Hardek, T.; Kim, S-H.; McCarthy, M.; Vassioutchenko, A.] ORNL, Oak Ridge, TN USA. RP Kang, YW (reprint author), ORNL, Oak Ridge, TN USA. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4264 EP 4266 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304338 ER PT B AU Kim, S Campisi, IE Casagrande, F Crofford, M Kang, Y Kursun, Z Stout, D Vassioutchenko, A AF Kim, S. Campisi, I. E. Casagrande, F. Crofford, M. Kang, Y. Kursun, Z. Stout, D. Vassioutchenko, A. GP IEEE TI Status of the SNS cryomodule test SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The cryomodule tests are on going to have better understandings of physics as a whole and eventually to provide safe and reliable operation for neutron production. Some features are revealed to be interesting issues and need more attentions than expected, such as operating condition, collective effects between cavities, HOM coupler issues, end-group stability, cavity-coupler interactions, and vacuum/gas physics, waiting for more investigations. Up to now SNS cryomodules were mainly tested at 2.1K/4.4 K, 10 pulse per second (pps) and 30 pps/60 pps tests are under progress. This paper presents briefly the experiences and the observations during tests of cryomodules. C1 [Kim, S.; Campisi, I. E.; Casagrande, F.; Crofford, M.; Kang, Y.; Kursun, Z.; Stout, D.; Vassioutchenko, A.] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Kim, S (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. EM kimsh@ornl.gov 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4267 EP 4269 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304339 ER PT B AU Mize, JJ Anderson, DE Hicks, J Wezensky, M AF Mize, J. J. Anderson, D. E. Hicks, J. Wezensky, M. GP IEEE TI Dynamic fault detection chassis for the 1MW high voltage converter modulator system at the Spallation Neutron Source SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The high frequency switching megawatt-class High Voltage Converter Modulator (HVCM) developed by Los Alamos National Laboratory for the Oak Ridge National Laboratorys Spallation Neutron Source (SNS) is now in operation. One of the major problems with the modulator systems is shoot-thru conditions that can occur in an IGBT H-bridge topology resulting in large fault currents and device failure in a few microseconds. The Dynamic Fault Detection Chassis (DFDC) is a fault monitoring system. It monitors transformer flux saturation using a window comparator and dV/dt events on the cathode voltage caused by any abnormality such as capacitor breakdown, transformer primary turns shorts, or dielectric breakdown between the transformer primary and secondary. If faults are detected, the DFDC will inhibit the IGBT gate drives and shut the system down, significantly reducing the possibility of a shoot-thru. condition or other equipment damaging events. In this paper, we will present system integration considerations, performance characteristics of the DFDC, and discuss its ability to significantly reduce costly down time for the entire facility. C1 [Mize, J. J.; Anderson, D. E.; Hicks, J.; Wezensky, M.] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Mize, JJ (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4270 EP 4272 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304340 ER PT B AU Zhang, Y Campisi, IE Deibele, C Galambos, J Henderson, SD Ma, H Kang, Y Wilson, J AF Zhang, Y. Campisi, I. E. Deibele, C. Galambos, J. Henderson, S. D. Ma, H. Kang, Y. Wilson, J. GP IEEE TI Transient beam-loading detection in an SNS cavity - Simulations and initial measurements SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Beam phase measurement based on the detection of a transient beam-loading signal in a SC cavity has the potential to become a very fast linac tune-up technique, especially for an electron linac, as it may precisely set up the cavity's synchronous phase. A large signal-to-noise ratio is critical in the development of a transient detector technique. This paper discusses the study of a transient detector in the Spallation Neutron Source proton linac and the major challenge for this method: stochastic noise in the rf system, which reduces the precision and increases the time needed for accurate phase measurement. Using simulation studies with a beam-cavity model, signal measurement with the Low-Level RF system and the experiment with prototype detectors, we analyzed the influence of noise on phase measurement. C1 [Zhang, Y.; Campisi, I. E.; Deibele, C.; Galambos, J.; Henderson, S. D.; Ma, H.; Kang, Y.; Wilson, J.] Oak Ridge Natl Lab, Spallat Neutron Source, Oak Ridge, TN 37831 USA. RP Zhang, Y (reprint author), Oak Ridge Natl Lab, Spallat Neutron Source, Oak Ridge, TN 37831 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4273 EP 4275 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304341 ER PT B AU Zhang, Y Ma, H Champion, M Chu, P Cousineau, S Danilov, V Hardek, T Holmes, J Piller, M Plum, M AF Zhang, Y. Ma, H. Champion, M. Chu, P. Cousineau, S. Danilov, V. Hardek, T. Holmes, J. Piller, M. Plum, M. GP IEEE TI Simulation study and initial test of the SNS ring RF system SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The rfsimulator code was developed for the study of the Spallation Neutron Source (SNS) dual-harmonic ring RF control. It uses time-domain solvers to compute beam-cavity interactions and FFT methods to simulate the time responses of the linear RF system. The important elements of the system considered in the model include beam loading, dynamic cavity detuning, circuit bandwidth, loop delay, proportional-integral controller for feedback and adaptive feed forward, stochastic noise, width-in-turn loop parameter change, beam current fluctuation, and bunch leakage. As the beam power increases, beam loss in the ring goes up and thus precise control of the bunching RF phase and amplitude is required to Emit beam loss. The code will help in the development of a functional RF control and in achieving the goal of minimizing beam loss in the accumulator ring. C1 [Zhang, Y.; Ma, H.; Champion, M.; Chu, P.; Cousineau, S.; Danilov, V.; Hardek, T.; Holmes, J.; Piller, M.; Plum, M.] Oak Ridge Natl Lab, Spallat Neutron Source, Oak Ridge, TN 37831 USA. RP Zhang, Y (reprint author), Oak Ridge Natl Lab, Spallat Neutron Source, Oak Ridge, TN 37831 USA. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4276 EP 4278 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304342 ER PT B AU Keung, JK Newcomer, M Nagaitsev, S Lockyer, N AF Keung, Justin Kien Newcomer, Mitch Nagaitsev, Sergei Lockyer, Nigel GP IEEE TI PVC - An ILC RF cryomodule software simulator SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB We are developing the Penn Virtual Cavity (PVC). It is a software Superconducting RF (SRF) cavity simulator that simulates the effect of each component involved in controlling the precise oscillations of the 1.3 GHz fields in the cavities within a cryomodule. The simulator models the SRF cavity as lumped RLC circuits [1]. The effects of the components involved are simulated in PVC as time dependent changes of the current/voltage at the interface of the RLC circuits, as well as time dependent changes in the RLC values themselves. This simulator can be used as an expert tool to study cavity control issues, as well as a learning tool to get a general idea of the RF characteristics of the SRF cavities. C1 [Keung, Justin Kien; Newcomer, Mitch] Univ Penn, Philadelphia, PA 19104 USA. [Nagaitsev, Sergei] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. [Lockyer, Nigel] TRIUMF, Vancouver, BC V6T 2A3, Canada. RP Keung, JK (reprint author), Univ Penn, Philadelphia, PA 19104 USA. EM keungj@hep.upenn.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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4279 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304343 ER PT B AU Jing, C Kanareykin, A Gao, F Konecny, R Gai, W Kazakov, S AF Jing, C. Kanareykin, A. Gao, F. Konecny, R. Gai, W. Kazakov, S. GP IEEE TI Design of a 26 GHz wakefield power extractor SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB High frequency, high output power, and high efficiency RF sources have compelling applications in accelerators for high energy physics. The 26 GHz RF power extractor proposed in this paper provides a practical approach for generating high power RF in this particular frequency range. The extractor is designed to couple out RF power generated from the high charge electron bunch train at the Argonne Wakefield Accelerator (AWA) facility traversing a dielectric loaded waveguide. Designs are presented including parameter optimization, electromagnetic modeling of structures and RF couplers, and analysis of beam dynamics. C1 [Jing, C.; Kanareykin, A.] LLC, Euclid Techlabs, Solon, OH 44139 USA. [Gao, F.; Konecny, R.; Gai, W.] Argonne Natl Lab, Argonne, IL 60439 USA. [Kazakov, S.] KEK, Tsukuba, Ibaraki, Japan. RP Jing, C (reprint author), LLC, Euclid Techlabs, Solon, OH 44139 USA. EM jingchg@hep.anl.gov FU DOE SBIR Phase I Funding FX Work is supported by DOE SBIR Phase I Funding. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4291 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304347 ER PT B AU Burrill, A Ben-Zvi, I Calaga, R Hahn, H Litvinenko, V McIntyre, G Kneisel, P Mammoser, J Preble, JP Reece, CE Rimmer, R Saunders, J AF Burrill, A. Ben-Zvi, I. Calaga, R. Hahn, H. Litvinenko, V. McIntyre, G. Kneisel, P. Mammoser, J. Preble, J. P. Reece, C. E. Rimmer, R. Saunders, J. GP IEEE TI Challenges encountered during the processing of the BNL ERL 5 cell accelerating cavity SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB One of the key components for the Energy Recovery Linac being built by the Electron cooling group in the Collider Accelerator Department is the 5 cell accelerating cavity which is designed to accelerate 2 MeV electrons from the gun up to 15-20 MeV, allow them to make one pass through the ring and then decelerate them back down to 2 MeV prior to sending them to the dump. This cavity was designed by BNL and fabricated by AES in Medford, NY. Following fabrication it was sent to Thomas Jefferson Lab in VA for chemical processing, testing and assembly into a string assembly suitable for shipment back to BNL for integration into the ERL. The steps involved in this processing sequence will be reviewed and the deviations from processing of similar SRF cavities will be discussed. The lessons learned from this process are documented to help future projects where the scope is different from that normally encountered. C1 [Burrill, A.; Ben-Zvi, I.; Calaga, R.; Hahn, H.; Litvinenko, V.; McIntyre, G.] BNL, Upton, NY 11974 USA. [Kneisel, P.; Mammoser, J.; Preble, J. P.; Reece, C. E.; Rimmer, R.; Saunders, J.] Jefferson Lab, Newport News, VA 23606 USA. RP Burrill, A (reprint author), BNL, Upton, NY 11974 USA. EM aburrill@bnl.gov FU US Department of Energy FX Work performed under the auspices of the U.S. Department of Energy. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4297 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304349 ER PT B AU Burrill, A Ben-Zvi, I Cole, M Rathke, J Kneisel, P Manus, R Rimmer, R AF Burrill, A. Ben-Zvi, I. Cole, M. Rathke, J. Kneisel, P. Manus, R. Rimmer, R. GP IEEE TI Multipacting analysis of a quarter wave choke joint used for insertion of a demountable cathode into a SRF photoinjector SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The multipacting phenomena in accelerating structures and coaxial lines are well documented and methods of mitigating or suppressing it are understood. The multipacting that occurs in a quarter wave choke joint designed to mount a cathode insertion stalk into a superconducting RF photoinjector has been analyzed via calculations and experimental measurements and the effect of introducing multipacting suppression grooves into the structure is analyzed. Several alternative choke joint designs are analyzed and suggestions made regarding future choke joint development. Furthermore, the problems encountered in cleaning the choke joint surfaces, factors important in changes to the secondary electron yield, are discussed and evaluated. This design is being implemented on the BNL 1.3 GHz photoinjector,[I] previously used for measurement of the quantum efficiency of bare Nb, to allow for the introduction of other cathode materials for study, and to verify the design functions properly prior to constructing our 703 MHz photoinjector with a similar choke joint design. C1 [Burrill, A.; Ben-Zvi, I.] BNL, Upton, NY 11974 USA. [Cole, M.; Rathke, J.] Adv Energy Syst, Medford 11763, NY USA. [Kneisel, P.; Manus, R.; Rimmer, R.] Jafferson Lab, Newport News, VA 23606 USA. RP Burrill, A (reprint author), BNL, Upton, NY 11974 USA. EM aburrill@bnl.gov 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4300 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304350 ER PT B AU Chang, XY Ben-Zvi, I Kewisch, J Pai, CI AF Chang, Xiangyun Ben-Zvi, Ilan Kewisch, Joerg Pai, Chien-Ih GP IEEE TI High average current low emittance beam employing CW normal conducting gun SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB CW normal conducting guns usually do not achieve very high field gradient and waste much RF power at high field gradient compared to superconducting cavities. But they have less trapped modes and wakefields compared to the superconducting cavities due to their low Q. The external bucking coil can also be applied very close to the cathode to improve the beam quality. By using a low frequency gun with a recessed cathode and a carefully designed beam line we can get a high average current and a high quality beam with acceptable RF power loss on the cavity wall. This paper shows that the CW normal conducting gun can be a backup solution for those projects which need high peak and average current, low emittance electron beams such as the Relativistic Heavy Ion Collider (RHIC) e-cooling project and Energy Recovery Linac (ERL) project. C1 [Chang, Xiangyun; Ben-Zvi, Ilan; Kewisch, Joerg; Pai, Chien-Ih] Brookhaven Natl Lab, Upton, NY 11973 USA. RP Chang, XY (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4303 EP 4305 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304351 ER PT B AU Rose, J Blednykh, A Guo, W Mortazavi, P Towne, N AF Rose, J. Blednykh, A. Guo, W. Mortazavi, P. Towne, N. GP IEEE TI Conceptual design of the NSLS-II RF system SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB RF system requirements are derived from machine parameters and beam stability specifications. The conceptual design of the RF system for NSLS-II to meet these requirements is presented, consisting of 500 MHz superconducting main cavities, 1500 MHz pasive SCRF harmonic cavities for bunch lengthening, and the RF power and cryogenic systems.. C1 [Rose, J.; Blednykh, A.; Guo, W.; Mortazavi, P.; Towne, N.] Brookhaven Natl Lab, Upton, NY 11973 USA. RP Rose, J (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. EM rose@bnl.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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4306 EP 4308 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304352 ER PT B AU Zhang, W Eng, W Pai, C Sandberg, J Tan, Y Tian, Y AF Zhang, W. Eng, W. Pai, C. Sandberg, J. Tan, Y. Tian, Y. GP IEEE TI A simplified approach to analyze and model inductive voltage adder SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB We have recently developed a simplified model and a set of simple formulas for inductive voltage adder design. This model reveals the relationship of output waveform. parameters and hardware designs. A computer simulation has demonstrated that parameter estimation based on this approach is accurate as compared to an actual circuit. This approach can be used in early stages of project development to assist feasibility study, geometry selection in engineering design, and parameter selection of critical components. In this paper, we give the deduction of a simplified model. Among the estimation formulas we present are those for pulse rise time, system impedance, and number of stages. Examples are used to illustrate the advantage of this approach. This approach is also applicable to induction LINAC design. C1 [Zhang, W.; Eng, W.; Pai, C.; Sandberg, J.; Tan, Y.; Tian, Y.] Brookhaven Natl Lab, Upton, NY 11973 USA. RP Zhang, W (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. EM arling@bnl.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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4309 EP 4311 PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304353 ER PT B AU Deibele, C Assadi, S Danilov, S Henderson, S Plum, M Gilpatrick, D McCrady, R Macek, R Power, J Zaugg, T Byrd, J Breitzman, S Lee, SY Pivi, M Schulte, M Polisetti, A Xie, Z AF Deibele, C. Assadi, S. Danilov, S. Henderson, S. Plum, M. Gilpatrick, D. McCrady, R. Macek, R. Power, J. Zaugg, T. Byrd, J. Breitzman, S. Lee, S. Y. Pivi, M. Schulte, M. Polisetti, A. Xie, Z. GP IEEE TI Experimental tests of a prototype system for active damping of the e-p instability at the LANL PSR SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB A prototype of an analog, transverse feedback system for damping of the two-stream (e-p) instability has been developed and successfully tested at the Los Alamos Proton Storage Ring (PSR). This paper describes the system configuration, results of several experimental tests and studies of system optimization along with studies of the factors limiting its performance. C1 [Deibele, C.; Assadi, S.; Danilov, S.; Henderson, S.; Plum, M.] ORNL, Oak Ridge, TN USA. [Gilpatrick, D.; McCrady, R.; Macek, R.; Power, J.; Zaugg, T.] Lanl, Los Alamos, NM USA. [Byrd, J.] LBNL, Berkeley, CA USA. [Breitzman, S.; Lee, S. Y.] IU, Bloomington, IN USA. [Pivi, M.] SALC, Menlo Pk, CA USA. [Schulte, M.; Polisetti, A.; Xie, Z.] UW Madison, Madison, WI USA. RP Deibele, C (reprint author), ORNL, Oak Ridge, TN USA. FU U.S. Department of Energy [DE-AC05-00OR22725] FX ORNL/SNS is managed by UT-Battelle, LLC, for the U.S. Department of Energy under contract DE-AC05-00OR22725 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4326 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304357 ER PT B AU Sears, CMS Colby, ER Ischebeck, R McGuinness, CM Siemann, RH Spencer, JE Walz, D Byer, RL Plettner, T AF Sears, Chris M. S. Colby, Eric R. Ischebeck, Rasmus McGuinness, Chris M. Siemann, Robert H. Spencer, James E. Walz, Dieter Byer, Robert L. Plettner, Tomas GP IEEE TI Initial laser acceleration experiments of the E163 program at SLAC SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB This paper presents the initial results in laser electron acceleration from the newly commissioned E163 program at SLAC and an outline of the initial wave of experiments. These results include an inverse free electron laser (IFEL) interaction with 800nm light from a Ti:sapphire laser which will be used along with a chicane to produce optically spaced electron microbunches. The microbunching is independently diagnosed via coherent optical transition radiation (COTR) at the second harmonic (400nm) in order to avoid large background at the furidamental due to the laser. We will also discuss experiments that take the microbunch train formed by the IFEL/chicane and perform net acceleration using a second stage: an inverse transition radiation accelerator (ITR). This discussion includes the experiment layout and hardware as well as simulation of expected results. C1 [Sears, Chris M. S.; Colby, Eric R.; Ischebeck, Rasmus; McGuinness, Chris M.; Siemann, Robert H.; Spencer, James E.; Walz, Dieter] SLAC, Menlo Pk, CA USA. [Siemann, Robert H.; Spencer, James E.; Walz, Dieter] SLAC, Menlo Pk, CA USA. [Byer, Robert L.; Plettner, Tomas] Stanford Univ, Stanford, CA USA. RP Sears, CMS (reprint author), SLAC, Menlo Pk, CA USA. EM cmsears@slac.stanford.edu FU Department of Energy [DE-AC02-76SF00515, DE-FG06-97ER41276] FX This work is supported by Department of Energy contracts DE-AC02- 76SF00515 and DE-FG06-97ER41276. 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4337 EP + PG 3 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304359 ER PT B AU Conde, ME AF Conde, M. E. GP IEEE TI Survey of advanced dielectric wakefield accelerators SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB This survey highlights some of the most significant experimental work carried out in the development of dielectric wakefield accelerating structures. Both the collinear and the two-beam-accelerator configurations are presented, and the operating frequencies are in the few GHz range or in the THz regime. Planned future experiments are also briefly discussed. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Conde, ME (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. EM conde@anl.gov NR 11 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4342 EP 4346 PG 5 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304360 ER PT B AU Himel, T Nelson, J Phinney, N Ross, M AF Himel, T. Nelson, J. Phinney, N. Ross, M. GP IEEE TI Availability and reliability issues for ILC SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The International Linear Collider (ILC) will be the largest most complicated accelerator ever built. For this reason extensive work is being done early in the design phase to ensure that it will be reliable enough. This includes gathering failure mode data from existing accelerators and simulating the failures and repair times of the ILC. This simulation has been written in a general fashion using MATLAB and could be used for other accelerators. Results from the simulation tool have been used in making some of the major ILC design decisions and an unavailability budget has been developed. C1 [Himel, T.; Nelson, J.; Phinney, N.] SLAC, Menlo Pk, CA 94025 USA. [Ross, M.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Himel, T (reprint author), SLAC, Menlo Pk, CA 94025 USA. EM thimel@slac.stanford.edu FU U.S. Department of Energy [DE-AC02-76SF00515] FX Work supported by the U.S. Department of Energy under contract DE-AC02-76SF00515 NR 0 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4352 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304362 ER PT B AU Burov, A Lebedev, V AF Burov, A. Lebedev, V. GP IEEE TI Instabilities of cooled antiproton beam in recycler SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The more beam is cooled, the less stable it is. In the 3.3 km Recycler Ring, stacked 8 GeV antiprotons are cooled both with stochastic (transversely) and electron (3D) cooling. Since the machine is staying near the coupling resonance, coupled optical functions should be used for stability analysis. To stabilize beam against the resistive wall instability, a digital damper is used. Digital dampers can be described as linear operators with explicit time dependence, and that makes a principle difference with analogous dampers. Theoretical description of the digital dampers is presented. Electron cooling makes possible a two-beam instability of the cooled beam with the electron beam. Special features of this instability are described, and the remedy is discussed. C1 [Burov, A.; Lebedev, V.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Burov, A (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4356 EP 4360 PG 5 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304363 ER PT B AU Blaskiewicz, M Brennan, JM Severino, R AF Blaskiewicz, M. Brennan, J. M. Severino, R. GP IEEE TI Stochastic cooling of high-energy bunched beams SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB Stochastic cooling of 100 GeV/nucleon bunched beams has been achieved in the Relativistic Heavy Ion Collider (RHIC). The physics and technology of the longitudinal cooling system are discussed, and plans for a transverse cooling system are outlined. C1 [Blaskiewicz, M.; Brennan, J. M.; Severino, R.] Brookhaven Natl Lab, Upton, NY 11973 USA. RP Blaskiewicz, M (reprint author), Brookhaven Natl Lab, 911B, Upton, NY 11973 USA. EM blaskiewicz@bnl.gov NR 28 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4361 EP 4365 PG 5 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304364 ER PT B AU Gonsalves, AJ Nakamura, K Toth, C Geddes, CGR Schroeder, CB Esarey, E Cormier-Michel, E Leemans, WP Brahwiler, D Cary, JR Hooker, SM AF Gonsalves, A. J. Nakamura, K. Toth, Cs. Geddes, C. G. R. Schroeder, C. B. Esarey, E. Cormier-Michel, E. Leemans, W. P. Brahwiler, D. Cary, J. R. Hooker, S. M. GP IEEE TI GeV electron beams from a centimeter-scale laser-driven plasma accelerator SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE ID DISCHARGE WAVE-GUIDE; PULSES; INJECTION AB Results are presented on the generation of quasi-monoenergetic electron beams with energy up to 1GeV using a 40 TW laser and a 3.3 cm-long hydrogen-filled capillary discharge waveguide [1, 2]. Electron beams were not observed without a plasma channel, indicating that self-focusing alone could not be relied upon for effective guiding of the laser pulse. Results are presented of the electron beam spectra, and the dependence of the reliability of producing electron beams as a function of laser and plasma parameters. C1 [Gonsalves, A. J.; Nakamura, K.; Toth, Cs.; Geddes, C. G. R.; Schroeder, C. B.; Esarey, E.; Cormier-Michel, E.; Leemans, W. P.] LBNL, Berkeley, CA USA. [Brahwiler, D.; Cary, J. R.] Tech X corp, Boulder, CO 80303 USA. [Hooker, S. M.] Univ Oxford, Oxford OX1 3PU, England. RP Gonsalves, AJ (reprint author), LBNL, Berkeley, CA USA. RI Hooker, Simon/D-1402-2015 OI Hooker, Simon/0000-0002-1243-520X NR 19 TC 0 Z9 0 U1 0 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4367 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304365 ER PT B AU Gollwitzer, K AF Gollwitzer, K. GP IEEE TI Run II luminosity progress SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB The Fermilab Tevatron Collider Run H program continues at the energy and luminosity frontier of high energy particle physics. To the collider experiments CDF and DO, over 3 fb(-1) of integrated luminosity has been delivered to each. Upgrades and improvements in the Antiproton Source of the production and collection of antiprotons have led to increased number of particles stored in the Rccycler. Electron cooling and associated improvements have help make a brighter antiproton beam at collisions. Tevatron improvements to handle the increased number of particles and the beam lifetimes have resulted in an increase in luminosity. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Gollwitzer, K (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4383 EP 4387 PG 5 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304368 ER PT B AU Ptitsyn, V AF Ptitsyn, V. GP IEEE TI From HERA to future electron-ion collriders SO 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 SE IEEE Particle Accelerator Conference LA English DT Proceedings Paper CT IEEE Particle Accelerator Conference CY JUN 25-29, 2007 CL Albuquerque, NM SP IEEE AB An overview of the proposals of new electron-ion colliders - e-MC at BNL, EIC at JLab and LHeC at CERN - in the light of experience with BERA is presented. C1 BNL, Upton, NY 11980 USA. RP Ptitsyn, V (reprint author), BNL, Upton, NY 11980 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 BN 978-1-4244-0916-7 J9 IEEE PART ACC CONF PY 2007 BP 4388 EP 4392 PG 5 WC Engineering, Electrical & Electronic; Physics, Particles & Fields SC Engineering; Physics GA BHP10 UT WOS:000255096304369 ER PT S AU Harnmerstrom, DJ Zhou, N Lu, N AF Harnmerstrom, D. J. Zhou, N. Lu, N. GP IEEE TI Controller design of power quality-improving appliances SO 2007 IEEE POWER ELECTRONICS SPECIALISTS CONFERENCE, VOLS 1-6 SE IEEE POWER ELECTRONICS SPECIALISTS CONFERENCE RECORDS LA English DT Proceedings Paper CT 38th IEEE Power Electronic Specialists Conference CY JUN 17-21, 2007 CL Orlando, FL AB This paper presents an innovative solution to power quality problems using power quality-improving (PQI) appliances. PQI appliances conduct currents that supplement and correct the sum of the other load currents within a premise. From the utility side, the premise housing a PQI appliance thus becomes an improved, if not ideal, utility customer. The PQI appliance improves both harmonic power quality and power factor while performing its normal function, such as heating water. In this paper, the water heater PQI appliance is used as an example to demonstrate the control circuit design and function. Both computer simulation results and laboratory experiment results are presented to demonstrate the effectiveness of the approach. The estimated costs of the PQI controller and of harmonic compensating filters are compared to show that the PQI appliance may be an economic way to provide power quality improvement at the building level. C1 [Harnmerstrom, D. J.; Zhou, N.; Lu, N.] Pacific NW Natl Lab, Richland, WA 99352 USA. RP Harnmerstrom, DJ (reprint author), Pacific NW Natl Lab, 902 Battelle Blvd, POB 999, Richland, WA 99352 USA. NR 8 TC 0 Z9 0 U1 0 U2 2 PU IEEE, ELECTRON DEVICES SOC & RELIABILITY GROUP PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 0275-9306 BN 978-1-4244-0654-8 J9 IEEE POWER ELECTRON PY 2007 BP 1164 EP 1169 PG 6 WC Engineering, Multidisciplinary; Engineering, Electrical & Electronic SC Engineering GA BHD87 UT WOS:000252375202020 ER PT S AU Su, GJ Cunningham, JP Tang, L AF Su, Gui-Jia Cunningham, Joseph P. Tang, Lixin GP IEEE TI A reduced-part, triple-voltage DC-DC converter for electric vehicle power management SO 2007 IEEE POWER ELECTRONICS SPECIALISTS CONFERENCE, VOLS 1-6 SE IEEE POWER ELECTRONICS SPECIALISTS CONFERENCE RECORDS LA English DT Proceedings Paper CT 38th IEEE Power Electronic Specialists Conference CY JUN 17-21, 2007 CL Orlando, FL DE multi-voltage-bus dc-dc converter; EV/HEV power management; soft-switching ID FUEL-CELL AB Electrical power systems in future hybrid and fuel cell vehicles may consist of three voltage nets; 14V, 42V and high voltage (>200V) buses. A soft-switched, bi-directional dc-dc converter using only four switches was proposed for interconnecting the three nets. This paper presents a reduced-part dc-dc converter, which decreases the converter cost while retaining all the favorable features of the original topology. Simulation and experimental data are included to verify a simple power How control scheme. C1 [Su, Gui-Jia; Cunningham, Joseph P.] Natl Transportat Res Ctr, Oak Ridge Natl Lab, Knoxville, TN 37932 USA. RP Su, GJ (reprint author), Natl Transportat Res Ctr, Oak Ridge Natl Lab, Knoxville, TN 37932 USA. RI Tang, Lixin/B-9242-2009 OI Tang, Lixin/0000-0001-8361-8196 NR 15 TC 1 Z9 1 U1 0 U2 1 PU IEEE, ELECTRON DEVICES SOC & RELIABILITY GROUP PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 0275-9306 BN 978-1-4244-0654-8 J9 IEEE POWER ELECTRON PY 2007 BP 1989 EP 1994 DI 10.1109/PESC.2007.4342310 PG 6 WC Engineering, Multidisciplinary; Engineering, Electrical & Electronic SC Engineering GA BHD87 UT WOS:000252375203065 ER PT S AU Tang, LX Su, GJ AF Tang, Lixin Su, Gui-Jia GP IEEE TI High-performance control of two three phase permanent magnet synchronous machines in an integrated inverter for automotive applications SO 2007 IEEE POWER ELECTRONICS SPECIALISTS CONFERENCE, VOLS 1-6 SE IEEE POWER ELECTRONICS SPECIALISTS CONFERENCE RECORDS LA English DT Proceedings Paper CT 38th IEEE Power Electronic Specialists Conference CY JUN 17-21, 2007 CL Orlando, FL ID SPACE AB The closed loop DSP control of an integrated dual inverter, able to independently drive two three-phase permanent magnet motors, is presented. By utilizing the neutral point of the main traction motor, only two inverter legs are needed for the three-phase auxiliary motor. Utilizing this topology one inverter leg is eliminated and an integrated, reduced component count drive is achieved. C1 [Tang, Lixin] Oak Ridge Associated Univ, Knoxville, TN 37932 USA. RP Tang, L (reprint author), Oak Ridge Associated Univ, Knoxville, TN 37932 USA. RI Tang, Lixin/B-9242-2009 OI Tang, Lixin/0000-0001-8361-8196 NR 9 TC 0 Z9 0 U1 0 U2 1 PU IEEE, ELECTRON DEVICES SOC & RELIABILITY GROUP PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 0275-9306 BN 978-1-4244-0654-8 J9 IEEE POWER ELECTRON PY 2007 BP 2001 EP 2007 DI 10.1109/PESC.2007.4342312 PG 7 WC Engineering, Multidisciplinary; Engineering, Electrical & Electronic SC Engineering GA BHD87 UT WOS:000252375203067 ER PT S AU Hsu, JS Lee, ST Wiles, RH Coorner, CL Lowe, KT Burress, TA AF Hsu, J. S. Lee, S. T. Wiles, R. H. Coorner, C. L. Lowe, K. T. Burress, T. A. GP IEEE TI Effect of side permanent magnets for reluctance interior permanent magnet machines SO 2007 IEEE POWER ELECTRONICS SPECIALISTS CONFERENCE, VOLS 1-6 SE IEEE POWER ELECTRONICS SPECIALISTS CONFERENCE RECORDS LA English DT Proceedings Paper CT 38th IEEE Power Electronic Specialists Conference CY JUN 17-21, 2007 CL Orlando, FL DE ac machines; interior permanent magnet; reluctance; electric vehicles AB A traditional electric machine uses two dimensional magnetic flux paths in its rotor. This paper presents the development work on the utilization of the third dimension of a rotor. As an example, the air gap flux of a radial gap interior permanent magnet motor can be significantly enhanced by additional permanent magnets (PM) mounted at the sides of the rotor. A prototype motor built with this concept provided higher efficiency and required a shorter stator core length for the same power output as the Toyota/Prius traction drive motor. C1 [Hsu, J. S.; Lee, S. T.; Wiles, R. H.; Coorner, C. L.; Lowe, K. T.; Burress, T. A.] Oak Ridge Natl Lab, Knoxville, TN 37932 USA. RP Hsu, JS (reprint author), Oak Ridge Natl Lab, 2360 Cherahala Blvd, Knoxville, TN 37932 USA. NR 2 TC 2 Z9 2 U1 1 U2 2 PU IEEE, ELECTRON DEVICES SOC & RELIABILITY GROUP PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 0275-9306 BN 978-1-4244-0654-8 J9 IEEE POWER ELECTRON PY 2007 BP 2267 EP 2272 DI 10.1109/PESC.2007.4342362 PG 6 WC Engineering, Multidisciplinary; Engineering, Electrical & Electronic SC Engineering GA BHD87 UT WOS:000252375204027 ER PT S AU Du, Z Ozpineci, B Tolbert, LM AF Du, Zhong Ozpineci, Burak Tolbert, Leon M. GP IEEE TI Modulation extension control of hybrid cascaded H-bridge multilevel converters with 7-level fundamental frequency switching scheme SO 2007 IEEE POWER ELECTRONICS SPECIALISTS CONFERENCE, VOLS 1-6 SE IEEE POWER ELECTRONICS SPECIALISTS CONFERENCE RECORDS LA English DT Proceedings Paper CT 38th IEEE Power Electronic Specialists Conference CY JUN 17-21, 2007 CL Orlando, FL ID HARMONIC ELIMINATION; GENERALIZED TECHNIQUES; THYRISTOR INVERTERS; VOLTAGE CONTROL; INDEXES; DRIVES AB This paper presents a modulation extension control algorithm for hybrid cascaded H-bridge multilevel converters. The hybrid cascaded H-bridge multilevel motor drive using only a single DC source for each phase is promising for high power motor drive applications since it can greatly decrease the number of required DC power supplies, has high quality output power due to its high number of output levels, and has high conversion efficiency and low thermal stress by using fundamental frequency switching scheme. But one disadvantage of the 7-level fundamental frequency switching scheme is that its modulation index range is too narrow when capacitor's voltage balance is maintained. The proposed modulation extension control algorithm can greatly increase capacitors' charging time and decrease the capacitors' discharging time by injecting triplen harmonics to extend the modulation index range of the hybrid cascaded H-bridge multilevel converters. C1 [Du, Zhong; Ozpineci, Burak; Tolbert, Leon M.] Oak Ridge Natl Lab, Natl Transportat Res Ctr, Power Elect & Elect Machinery Res Ctr, Knoxville, TN 37932 USA. RP Du, Z (reprint author), Oak Ridge Natl Lab, Natl Transportat Res Ctr, Power Elect & Elect Machinery Res Ctr, 2360 Cherahala Blvd, Knoxville, TN 37932 USA. OI Tolbert, Leon/0000-0002-7285-609X NR 21 TC 4 Z9 4 U1 0 U2 2 PU IEEE, ELECTRON DEVICES SOC & RELIABILITY GROUP PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 0275-9306 BN 978-1-4244-0654-8 J9 IEEE POWER ELECTRON PY 2007 BP 2361 EP 2366 DI 10.1109/PESC.2007.4342380 PG 6 WC Engineering, Multidisciplinary; Engineering, Electrical & Electronic SC Engineering GA BHD87 UT WOS:000252375204041 ER PT S AU Xu, Y Tolbert, LM Kueck, JD Rizy, DT AF Xu, Yan Tolbert, Leon M. Kueck, John D. Rizy, D. Tom GP IEEE TI Voltage and current unbalance compensation using a parallel active filter SO 2007 IEEE POWER ELECTRONICS SPECIALISTS CONFERENCE, VOLS 1-6 SE IEEE POWER ELECTRONICS SPECIALISTS CONFERENCE RECORDS LA English DT Proceedings Paper CT 38th IEEE Power Electronic Specialists Conference CY JUN 17-21, 2007 CL Orlando, FL DE current unbalance; voltage unbalance; nonactive power; current control; voltage control ID REACTIVE POWER; CURRENT HARMONICS AB A three-phase insulated gate bipolar transistor (IGBT)-based parallel active filter is used for current and/or voltage unbalance compensation. An instantaneous power theory is adopted for real-time calculation and control. Three control schemes, current control, voltage control, and integrated control are proposed to compensate the unbalance of current, voltage, or both. The compensation results of the different control schemes in unbalance cases (load unbalance or voltage source unbalance) are compared and analyzed. The simulation and experimental results show that the control schemes can compensate the unbalance in load current or in the voltage source. Different compensation objectives can be achieved, i.e., balanced and unity power factor source current, balanced and regulated voltage, or both, by choosing appropriate control schemes. C1 [Xu, Yan; Tolbert, Leon M.; Kueck, John D.; Rizy, D. Tom] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Xu, Y (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. NR 17 TC 4 Z9 4 U1 0 U2 2 PU IEEE, ELECTRON DEVICES SOC & RELIABILITY GROUP PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 0275-9306 BN 978-1-4244-0654-8 J9 IEEE POWER ELECTRON PY 2007 BP 2919 EP 2925 DI 10.1109/PESC.2007.4342485 PG 7 WC Engineering, Multidisciplinary; Engineering, Electrical & Electronic SC Engineering GA BHD87 UT WOS:000252375205045 ER PT S AU Lu, N Li, Q Sun, X Khaleel, MA AF Lu, N. Li, Q. Sun, X. Khaleel, M. A. GP IEEE TI Dynamic modeling in solid-oxide fuel cells controller design SO 2007 IEEE POWER ENGINEERING SOCIETY GENERAL MEETING, VOLS 1-10 SE IEEE Power Engineering Society General Meeting LA English DT Proceedings Paper CT IEEE-Power-Engineering-Society General Meeting CY JUN 24, 2007 CL Tampa, FL SP IEEE Power Engn Soc DE fuel cells; modeling; distributed generation; power distribution; dynamics ID SIMULATION; STACK; PLANT AB In this paper, a dynamic model of the solid-oxide fuel cell (SOFC) power unit is developed for the purpose of designing a controller to regulate fuel flow rate, fuel temperature, air flow rate, and air temperature to maintain the SOFC stack temperature, fuel utilization rate, and voltage within operati I on limits. A lumped model is used to consider the thermal dynamics and the electro-chemical dynamics inside an SOFC power unit. The fluid dynamics at the fuel and air inlets are considered by using the in-flow ramp-rates. A simulation result has been presented to illustrate the dynamic response of an SOFC stack when changing the electric load and fuel flow rates. C1 [Lu, N.; Li, Q.; Sun, X.; Khaleel, M. A.] Pacific Northwest Natl Lab, POB 999,MSIN K5-20, Richland, WA 99352 USA. RP Lu, N (reprint author), Pacific Northwest Natl Lab, POB 999,MSIN K5-20, Richland, WA 99352 USA. RI Li, Qinghe/D-6747-2011 FU Pacific Northwest National Laboratory; U.S. Department of Energy by Battelle [DEAC05-76RL01830] FX This work is supported by the Pacific Northwest National Laboratory, operated for the U.S. Department of Energy by Battelle under Contract DEAC05-76RL01830. NR 12 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1932-5517 BN 978-1-4244-1296-9 J9 IEEE POWER ENG SOC PY 2007 BP 234 EP + PG 2 WC Engineering, Electrical & Electronic SC Engineering GA BGY37 UT WOS:000251345400048 ER PT S AU Muljadi, E Butterfield, CP Parsons, B Ellis, A AF Muljadi, E. Butterfield, C. P. Parsons, B. Ellis, A. GP IEEE TI Characteristics of variable speed wind turbines under normal and fault conditions SO 2007 IEEE POWER ENGINEERING SOCIETY GENERAL MEETING, VOLS 1-10 SE IEEE Power Engineering Society General Meeting LA English DT Proceedings Paper CT IEEE-Power-Engineering-Society General Meeting CY JUN 24, 2007 CL Tampa, FL SP IEEE Power Engn Soc DE wind turbine; wind farm; wind power plant; stability; wind energy; power system; variable-speed generation; renewable energy; low-voltage ride-through; weak grid; fault conditions AB Variable-speed wind turbines with full power processing capability are the new technology trend for large wind power plants. In this type of turbine, there is an interface between the generator and the utility grid. In this paper, we investigate the characteristics of a variable-speed wind turbine connected to a stiff grid or a weak grid, the role of reactive power compensation in optimizing the operation of the wind turbines, and the operation of a wind turbine under normal and fault conditions. Both steady state and dynamic analysis are presented. C1 [Muljadi, E.; Butterfield, C. P.; Parsons, B.] Natl Renewable Energy Lab, 1617 Cole Blvd, Golden, CO 80401 USA. [Ellis, A.] Publ Serv Co New Mexico, MS 0604, Albuquerque, NM 87158 USA. RP Muljadi, E (reprint author), Natl Renewable Energy Lab, 1617 Cole Blvd, Golden, CO 80401 USA. FU U.S. Department of Energy and Public Service Company of New Mexico FX We acknowledge the support of the U.S. Department of Energy and Public Service Company of New Mexico. 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 1932-5517 BN 978-1-4244-1296-9 J9 IEEE POWER ENG SOC PY 2007 BP 924 EP + PG 2 WC Engineering, Electrical & Electronic SC Engineering GA BGY37 UT WOS:000251345400172 ER PT S AU Botterud, A Mahalik, MR Veselka, TD Ryu, HS Sohn, KW AF Botterud, Audun Mahalik, Matthew R. Veselka, Thomas D. Ryu, Heon-Su Sohn, Ki-Won GP IEEE TI Multi-agent simulation of generation expansion in electricity markets SO 2007 IEEE POWER ENGINEERING SOCIETY GENERAL MEETING, VOLS 1-10 SE IEEE Power Engineering Society General Meeting LA English DT Proceedings Paper CT IEEE-Power-Engineering-Society General Meeting CY JUN 24, 2007 CL Tampa, FL SP IEEE Power Engn Soc DE electricity markets; generation expansion; agent-based modeling; probabilistic dispatch; decision analysis ID MODEL AB We present a new multi-agent model of generation expansion in electricity markets. The model simulates generation investment decisions of decentralized generating companies (GenCos) interacting in a complex, multidimensional environment A probabilistic dispatch algorithm calculates prices and profits for new candidate units in different future states of the system. Uncertainties in future load, hydropower conditions, and competitors' actions are represented in a scenario tree, and decision analysis is used to identify the optimal expansion decision for each individual GenCo. We test the model using real data for the Korea power system under different assumptions about market design, market concentration, and GenCo's assumed expectations about their competitors' investment decisions. C1 [Botterud, Audun; Mahalik, Matthew R.; Veselka, Thomas D.] Argonne Natl Lab, Decis & Informat Sci Div, 9700 S Cass Ave, Argonne, IL 60439 USA. [Ryu, Heon-Su; Sohn, Ki-Won] Korea Power Exchange, Power Planning Dept, Seoul 135791, South Korea. [Ryu, Heon-Su; Sohn, Ki-Won] Korea Power Exchange, Market Operat Dept, Seoul 135791, South Korea. RP Botterud, A (reprint author), Argonne Natl Lab, Decis & Informat Sci Div, 9700 S Cass Ave, Argonne, IL 60439 USA. EM abotterud@anl.gov; ma-halik@anl.gov; tdveselka@anl.gov; maxima@kpx.or.kr; kwson@kpx.or.kr FU UChicago Argonne, LLC with the U.S. Department of Energy [DE-AC02-06CH11357] FX The submitted manuscript was created by UChicago Argonne, LLC, under Contract No. DE-AC02-06CH11357 with the U.S. Department of Energy NR 11 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1932-5517 BN 978-1-4244-1296-9 J9 IEEE POWER ENG SOC PY 2007 BP 1384 EP 1391 PG 8 WC Engineering, Electrical & Electronic SC Engineering GA BGY37 UT WOS:000251345401065 ER PT S AU Wang, JJA Lara-Curzio, E King, T Graziano, J Chan, J AF Wang, John Jy-An Lara-Curzio, Edgar King, Thomas Graziano, Joseph Chan, John GP IEEE TI The integrity of ACSR full tension splice connector at higher operation temperature SO 2007 IEEE POWER ENGINEERING SOCIETY GENERAL MEETING, VOLS 1-10 SE IEEE Power Engineering Society General Meeting LA English DT Proceedings Paper CT IEEE-Power-Engineering-Society General Meeting CY JUN 24, 2007 CL Tampa, FL SP IEEE Power Engn Soc DE tensile splice connector integrity; transmission lines; ACSR; high temperature low sag conductors AB Due to the increase in power demand and limited investment in new infrastructure, existing overhead power transmission lines often need to operate at temperatures higher than those used for the original design criteria. This has led to the accelerated aging and degradation of splice connectors, which have been manifested by the formation of hot-spots that have been revealed by infrared imaging during inspection. The implications of connector aging is two-fold: (1) significant increase in resistivity of the splice connector (i.e., less efficient transmission of electricity) and (2) significant reduction in the connector clamping strength, which could ultimately result in separation of the power transmission fine at the joint. Therefore, the splice connector appears to be the weakest link in the electric power transmission lines. This paper presents a protocol for integrating analytical and experimental approaches to evaluate the integrity of a full tension single-stage splice connector assembly. C1 [Wang, John Jy-An; Lara-Curzio, Edgar; King, Thomas] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. [Graziano, Joseph] Tennessee Valley Author, Chattanooga, TN 37402 USA. [Chan, John] Elect Power Res Inst, Palo Alto, CA 94304 USA. RP Wang, JJA (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. EM wangja@ornl.gov; jagraziano@tva.gov; jchan@epri.com FU TLS Program; DOE Office of Electricity Delivery and Energy Reliability; [TPWRD-00782-2006] FX This work was supported by in part by the TLS Program and in part by the DOE Office of Electricity Delivery and Energy Reliability. Paper no. TPWRD-00782-2006 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 1932-5517 BN 978-1-4244-1296-9 J9 IEEE POWER ENG SOC PY 2007 BP 1813 EP 1819 PG 7 WC Engineering, Electrical & Electronic SC Engineering GA BGY37 UT WOS:000251345401138 ER PT S AU Thomas, H Kroposki, B Basso, T Treanton, BG AF Thomas, Holly Kroposki, Benjamin Basso, Thomas Treanton, Bemard G. GP IEEE TI Advancements in distributed generation issues: Interconnection, modeling, and tariffs SO 2007 IEEE POWER ENGINEERING SOCIETY GENERAL MEETING, VOLS 1-10 SE IEEE Power Engineering Society General Meeting LA English DT Proceedings Paper CT IEEE-Power-Engineering-Society General Meeting CY JUN 24, 2007 CL Tampa, FL SP IEEE Power Engn Soc DE distributed energy; distributed generation; fault current; interconnection; IEEE Std 1547; interface; inverter; microgrid; power electronics; power quality; energy management; power electronics; electric power tariffs AB The California Energy Commission is cost-sharing research with the Department of Energy through the National Renewable Energy Laboratory to address distributed energy resources (DER) topics. These efforts include developing interconnection and power management technologies, modeling the impacts of interconnecting DER with an area electric power system, and evaluating possible modifications to rate policies and tariffs. As a result, a DER interconnection device has been developed and tested. A workshop reviewed the status and issues of advanced power electronic devices. Software simulations used validated models of distribution circuits that incorporated DER, and tests and measurements of actual circuits with and without DER systems are being conducted to validate these models. Current policies affecting DER were reviewed and ratemaking policies to support deployment of DER through public utility rates and policies were identified. These advancements are expected to support the continued and expanded use of DER systems. C1 [Thomas, Holly; Kroposki, Benjamin; Basso, Thomas] Natl Renewable Energy Lab, Golden, CO 80401 USA. [Treanton, Bemard G.] Calif Energy Commiss, Sacramento, CA 98514 USA. RP Thomas, H (reprint author), Natl Renewable Energy Lab, Golden, CO 80401 USA. EM holly_thomas@nrel.gov; benjamin_kroposki@nrel.gov; thomas_basso@nrel.gov; Btreanto@energy.state.ca.us FU U.S. Department of Energy [DE-AC36-99GO10337]; California Energy Commission under Technology [500-03-011] FX This work has been authored by an employee or employees of the Midwest Research Institute under Contract No. DE-AC36-99GO10337 with the U.S. Department of Energy and by the California Energy Commission under Technology Partnership Agreement No. 500-03-011. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this work, or allow others to do so, for United States Government purposes. 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 1932-5517 BN 978-1-4244-1296-9 J9 IEEE POWER ENG SOC PY 2007 BP 1886 EP 1890 PG 5 WC Engineering, Electrical & Electronic SC Engineering GA BGY37 UT WOS:000251345401149 ER PT S AU Stevens, J Vollkommer, H Klapp, D AF Stevens, John Vollkommer, Harry Klapp, David GP IEEE TI CERTS microgrid system tests SO 2007 IEEE POWER ENGINEERING SOCIETY GENERAL MEETING, VOLS 1-10 SE IEEE Power Engineering Society General Meeting LA English DT Proceedings Paper CT IEEE-Power-Engineering-Society General Meeting CY JUN 24, 2007 CL Tampa, FL SP IEEE Power Engn Soc DE microgrid; microgrid controls; distributed generation; distributed resources; frequency droop; voltage droop AB This paper describes field testing of the CERTS Microgrid concepts in an actual hardware installation. The test setup, including hardware that incorporates the CERTS controls, is installed at American Electric Power's Walnut Test Site, near the AEP Dolan Test Center. The results of a variety of tests that cover different scenarios of step load changes and transitions from utility-tied to islanded operation will be described. C1 [Stevens, John] Sandia Natl Labs, Livermore, CA 94550 USA. [Vollkommer, Harry; Klapp, David] Amer Elect Power Co, Columbus, OH USA. RP Stevens, J (reprint author), Sandia Natl Labs, Livermore, CA 94550 USA. FU California Energy Commission; Public Interest Energy Research Program [500-03-024] FX The work described in this report was coordinated by the Consortium for Electric Reliability Technology Solutions with funding support from the California Energy Commission, Public Interest Energy Research Program, under contract #500-03-024. 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 1932-5517 BN 978-1-4244-1296-9 J9 IEEE POWER ENG SOC PY 2007 BP 2060 EP + PG 3 WC Engineering, Electrical & Electronic SC Engineering GA BGY37 UT WOS:000251345402013 ER PT S AU Marnay, C Venkataramanan, G Stadler, M Siddiqui, A Firestone, R Chandran, B AF Marnay, C. Venkataramanan, G. Stadler, M. Siddiqui, A. Firestone, R. Chandran, B. GP IEEE TI Optimal technology selection and operation of microgrids in commercial buildings SO 2007 IEEE POWER ENGINEERING SOCIETY GENERAL MEETING, VOLS 1-10 SE IEEE Power Engineering Society General Meeting LA English DT Proceedings Paper CT IEEE-Power-Engineering-Society General Meeting CY JUN 24, 2007 CL Tampa, FL SP IEEE Power Engn Soc DE buildings; building management systems; cogeneration; cooling; cost optimal control; dispersed storage and generation; distributed control; optimization methods; power system economics; power system planning AB The deployment of small (< 1-2 MW) clusters of generators, heat and electrical storage, efficiency investments, and combined heat and power (CHP) applications (particularly involving heat activated cooling) in commercial buildings promises significant benefits but poses many technical and financial challenges, both in system choice and its operation; if successful, such systems may be precursors to widespread microgrid deployment. The presented optimization approach to choosing such systems and their operating schedules uses Berkeley Lab's Distributed Energy Resources Customer Adoption Model [DER-CAM], extended to incorporate electrical storage options. DER-CAM chooses annual energy bill minimizing systems in a fully technology-neutral manner. An illustrative example for a San Francisco hotel is reported. The chosen system includes two engines and an absorption chiller, providing an estimated 11% cost savings and 10% carbon emission reductions, under idealized circumstances. C1 [Marnay, C.] Ernest Orlando Lawrence Berkeley Natl Lab, Berkeley Lab, Berkeley, CA 94720 USA. [Venkataramanan, G.] Univ Wisconsin, Madison, WI 53706 USA. [Stadler, M.] Ctr Energy & Innovat Technol, Austria Visit Scholar Berkeley Lab, Berkeley, CA USA. [Siddiqui, A.] UCL, Dept Stat Sci, London WC1E 6BT, England. [Firestone, R.; Chandran, B.] Berkeley Lab, Berkeley, CA USA. RP Marnay, C (reprint author), Ernest Orlando Lawrence Berkeley Natl Lab, Berkeley Lab, Berkeley, CA 94720 USA. EM C_Marnay@lbl.gov; giri@engr.wisc.cdu; MStadler@lbl.gov; afzal@stats.ucl.ac.uk; RMFirestone@lbl.gov; BGChandran@lbl.gov FU Office of Electricity Delivery and Energy Reliability; Distribution System Integration Program; U.S. Department of Energy [DE-AC02-05CH11231]; Electric Reliability Technology Solutions with funding provided by the California Energy Commission; Public Interest Energy Research Program [500-03-024] FX The work described in this report was funded by the Office of Electricity Delivery and Energy Reliability, Distribution System Integration Program of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231. It also builds on work previously supported by the Consortium for Electric Reliability Technology Solutions with funding provided by the California Energy Commission, Public Interest Energy Research Program, under Work for Others Contract No. 500-03-024. NR 9 TC 0 Z9 0 U1 0 U2 5 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1932-5517 BN 978-1-4244-1296-9 J9 IEEE POWER ENG SOC PY 2007 BP 2337 EP + PG 3 WC Engineering, Electrical & Electronic SC Engineering GA BGY37 UT WOS:000251345402067 ER PT S AU Makarov, YV Ma, J Dong, ZY AF Makarov, Yuri V. Ma, Jian Dong, ZhaoYang GP IEEE TI Determining static stability boundaries using a non-iterative method SO 2007 IEEE POWER ENGINEERING SOCIETY GENERAL MEETING, VOLS 1-10 SE IEEE Power Engineering Society General Meeting LA English DT Proceedings Paper CT IEEE-Power-Engineering-Society General Meeting CY JUN 24, 2007 CL Tampa, FL SP IEEE Power Engn Soc DE Jacobian; power flow; saddle node bifurcation; singular value decomposition; static voltage and angle stability; wide area security assessment ID SADDLE NODE BIFURCATION; VOLTAGE COLLAPSE; POWER-SYSTEMS; COMPUTATION; SPACE; FLOW AB Static voltage and angle stability conditions (and saddle node bifurcations) are often associated with singularities of the power flow Jacobian matrix. This paper presents a new method based on singularity conditions written in Cartesian coordinates to determine static stability boundaries. The Cartesian coordinates instead of the traditional polar coordinates are used, allowing non-iterative locating saddle-node bifurcation points of the power flow problem. The singularity problem is formulated and then is easily reduced to a linear set of equations with respect to the real and imaginary components of nodal voltages. Because the linear problem can be singular in its turning point, singular value decomposition is used to find its solutions. The proposed method allows quick exploration of static stability boundaries in the state space, which is essential for developing real-time wide-area and local system security assessment applications. This paper demonstrates some very promising initial results of a pilot research using a 3-bus power system. C1 [Makarov, Yuri V.] Pacific Northwest Natl Lab, Richland, WA 99352 USA. [Ma, Jian; Dong, ZhaoYang] Univ Queensland, Sch Informat Technol & Elect Engn, Brisbane, Qld 4072, Australia. RP Makarov, YV (reprint author), Pacific Northwest Natl Lab, Richland, WA 99352 USA. EM yuri.makarov@pnl.gov; jian@itee.uq.edu.au; zdong@itee.uq.edu.au RI gao, xiaodan/K-3594-2015 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 1932-5517 BN 978-1-4244-1296-9 J9 IEEE POWER ENG SOC PY 2007 BP 2651 EP + PG 3 WC Engineering, Electrical & Electronic SC Engineering GA BGY37 UT WOS:000251345402117 ER PT S AU Xu, Y Tolbert, LM Rizy, DT Kueck, JD AF Xu, Yan Tolbert, Leon M. Rizy, D. Tom Kueck, John D. GP IEEE TI Nonactive-power-related ancillary services provided by distributed energy resources SO 2007 IEEE POWER ENGINEERING SOCIETY GENERAL MEETING, VOLS 1-10 SE IEEE Power Engineering Society General Meeting LA English DT Proceedings Paper CT IEEE-Power-Engineering-Society General Meeting CY JUN 24, 2007 CL Tampa, FL SP IEEE Power Engn Soc DE ancillary services; distributed energy resources; harmonies; nonactive power; reactive power; unbalance; voltage regulation AB The nonactive-power-related ancillary services pro-tided by distributed energy (DE) resources are categorized by voltage regulation, reactive power compensation, power factor correction, voltage and/or current unbalance compensation, and harmonics compensation. An instantaneous nonactive power theory is adopted to control the DE system to provide these ancillary services. Three control schemes, including nonactive current compensation, power factor correction, and voltage regulation, are developed which can perform one or more of the ancillary services. The control schemes are implemented in a DE system in simulation and experiments. The simulation and the experimental results show that DE is feasible for providing nonactive-power-related anciflary services. C1 [Xu, Yan; Tolbert, Leon M.; Rizy, D. Tom; Kueck, John D.] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Xu, Y (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. EM xuy3@ornl.gov; tolbertlm@ornl.gov; rizydt@ornl.gov; kueckjd@ornl.gov FU Oak Ridge National Laboratory; U.S. Department of Energy [DE-AC05-00OR22725]; U.S.Government [DE-AC05-00OR22725] FX Prepared by the Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, managed by UT-Battelle for the U.S. Department of Energy under contract DE-AC05-00OR22725; The submitted manuscript has been authored by a contractor of the U.S. Government under Contract No. DE-AC05-00OR22725. Accordingly, the U.S.Government retains a non-exclusive, royalty-free license to publish from the contribution, or allow others to do so, for U.S. Government purpos 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 1932-5517 BN 978-1-4244-1296-9 J9 IEEE POWER ENG SOC PY 2007 BP 3148 EP 3154 PG 7 WC Engineering, Electrical & Electronic SC Engineering GA BGY37 UT WOS:000251345403031 ER PT S AU Huang, ZY Hauer, JF Martin, KE AF Huang, Zhenyu Hauer, John F. Martin, Kenneth E. GP IEEE TI Evaluation of PMU dynamic performance in both lab environments and under field operating conditions SO 2007 IEEE POWER ENGINEERING SOCIETY GENERAL MEETING, VOLS 1-10 SE IEEE Power Engineering Society General Meeting LA English DT Proceedings Paper CT IEEE-Power-Engineering-Society General Meeting CY JUN 24, 2007 CL Tampa, FL SP IEEE Power Engn Soc DE synchronized phasor measurements; phasor measurement units; dynamic testing; filtering characteristics; Wide Area Measurement System (WAMS). AB Capturing system dynamics is one important feature of phasor measurements. To ensure PMU accurately reflect system dynamic behavior, one must evaluate the dynamic performance of a PMU. PMU dynamic performance evaluation includes three aspects: PMU modeling studies, laboratory testing and field evaluation. This paper briefly reviews the general PMU model structure, and then continues on PMU dynamic performance evaluation from actual field measurements. Reasons for field evaluation include: 1) inappropriate fleld settings of a PMU would generate unexpected phasor measurements; and 2) many conditions can not be easily produced in a lab environment. PMU field evaluation includes aspects like time synchronization, timing inconsistency due to filtering, frequency calculation issues, parasitic oscillations/processing artifacts, etc. Actual WECC measurement examples will be presented. Dynamic PMU testing in a lab environment is explored with a special focus on PMU filtering characteristics. How the phasor quality would impact derived system dynamic characteristics is addressed in the later part of this paper. C1 [Huang, Zhenyu; Hauer, John F.] Pacific Northwest Natl Lab, Richland, WA 99352 USA. [Martin, Kenneth E.] Bonneville Power Adm, Vancouver, WA 98666 USA. RP Huang, ZY (reprint author), Pacific Northwest Natl Lab, Richland, WA 99352 USA. EM zhenyu.huang@pnl.gov; john.hauer@pnl.gov; kemartin@ieee.org 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 1932-5517 BN 978-1-4244-1296-9 J9 IEEE POWER ENG SOC PY 2007 BP 3209 EP 3214 PG 6 WC Engineering, Electrical & Electronic SC Engineering GA BGY37 UT WOS:000251345403044 ER PT S AU Nehrir, AH Jia, M Pierre, DA Harnmerstrom, DJ AF Nehrir, A. Hashem Jia, Min Pierre, Donald A. Harnmerstrom, Donald J. GP IEEE TI Power management of aggregate electric water heater loads by voltage control SO 2007 IEEE POWER ENGINEERING SOCIETY GENERAL MEETING, VOLS 1-10 SE IEEE Power Engineering Society General Meeting LA English DT Proceedings Paper CT IEEE-Power-Engineering-Society General Meeting CY JUN 24, 2007 CL Tampa, FL SP IEEE Power Engn Soc DE aggregate electric water heater load; load modeling; load control; load management ID MODEL AB This paper discusses a voltage-control strategy for power management of aggregate residential electric water heater (EWH) load. It is shown that by proper control of EWH operating voltage, the aggregate EWH power demand during peak-load hours can be reduced without necessarily sacrificing customers' comfort level. C1 [Nehrir, A. Hashem; Jia, Min; Pierre, Donald A.] Montana State Univ, Dept Elect & Comp Engn, Bozeman, MT 59717 USA. [Harnmerstrom, Donald J.] Pacific NorthWest Natl Lab, Energy Sci & Technol Div, Richland, WA USA. RP Nehrir, AH (reprint author), Montana State Univ, Dept Elect & Comp Engn, Bozeman, MT 59717 USA. FU U.S. Department of energy [DE-FC26-06NT42750] FX This work was supported by the U.S. Department of energy under contract DE-FC26-06NT42750. NR 15 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1932-5517 BN 978-1-4244-1296-9 J9 IEEE POWER ENG SOC PY 2007 BP 3393 EP 3398 PG 6 WC Engineering, Electrical & Electronic SC Engineering GA BGY37 UT WOS:000251345403076 ER PT S AU Kroposki, B Pink, C Basso, T DeBlasio, R AF Kroposki, Benjamin Pink, Christopher Basso, Thomas DeBlasio, Richard GP IEEE TI Microgrid standards and technology development SO 2007 IEEE POWER ENGINEERING SOCIETY GENERAL MEETING, VOLS 1-10 SE IEEE Power Engineering Society General Meeting LA English DT Proceedings Paper CT IEEE-Power-Engineering-Society General Meeting CY JUN 24, 2007 CL Tampa, FL SP IEEE Power Engn Soc DE microgrid; intentional islanding; distributed energy; distributed generation AB Distributed resources can provide power to local loads in the electric distribution system as well as benefits such as improved reliability. Microgrids are intentional islands formed at a facility or in an electrical distribution system that contain at least one distributed resource and associated loads. Microgrids that operate both electrical generation and loads in a coordinated manner can offer additional benefits to the customer and local utility. The loads and energy sources can be disconnected from and reconnected to the area or local utility with minimal disruption to the local loads, thereby improving reliability. This paper describes research being conducted in microgrid standards, technologies, and applications to allow successful implementation of this concept. C1 [Kroposki, Benjamin; Pink, Christopher; Basso, Thomas; DeBlasio, Richard] Natl Renewable Energy Lab, Golden, CO 80401 USA. RP Kroposki, B (reprint author), Natl Renewable Energy Lab, Golden, CO 80401 USA. EM benjamin_kroposki@nrel.gov; christopher_pink@nrel.gov; thomas_basso@nrel.gov; richard_deblasio@nrel.gov FU National Renewable Energy Laboratory by the Department of Energy under Midwest Research Institute [DE-AC36-99GO10337]; California Energy Commission [500-03-011] FX This work was supported at the National Renewable Energy Laboratory by the Department of Energy under Midwest Research Institute Contract No. DE-AC36-99GO10337 and by the California Energy Commission under Technology Partnership Agreement No. 500-03-011 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 1932-5517 BN 978-1-4244-1296-9 J9 IEEE POWER ENG SOC PY 2007 BP 3556 EP 3559 PG 4 WC Engineering, Electrical & Electronic SC Engineering GA BGY37 UT WOS:000251345403105 ER PT S AU Malmedal, K Kroposki, B Sen, PK AF Malmedal, K. Kroposki, B. Sen, P. K. GP IEEE TI Energy Policy Act of 2005 and its impact on renewable energy applications in USA SO 2007 IEEE POWER ENGINEERING SOCIETY GENERAL MEETING, VOLS 1-10 SE IEEE Power Engineering Society General Meeting LA English DT Proceedings Paper CT IEEE-Power-Engineering-Society General Meeting CY JUN 24, 2007 CL Tampa, FL SP IEEE Power Engn Soc DE energy policy act; renewable energy AB The US Energy Policy Act of 2005 will impact the applications and R & D efforts for every type of renewable energy source. A part of the bill has the stated purpose of achieving energy self-sufficiency by the year 2025 within the US, Canada, and Mexico. This bill also has provisions for anyone wishing to connect to the existing power grid at the distribution level and sell power to a utility or other entity including incentives for generation of electricity from certain types of sources. This paper will provide a comprehensive review and describe the impact this bill has on several types of renewable energy presently being considered for practical applications, its effect on the electricity market, national electrical grid, and perhaps the future of how electricity will be delivered in the US. C1 [Malmedal, K.] NEI Elect Power Engn, Denver, CO 80001 USA. [Kroposki, B.] Natl Renewable Energy Lab, Golden, CO 80401 USA. [Sen, P. K.] Colorado Sch Mines, Div Engn, Golden, CO 80401 USA. RP Malmedal, K (reprint author), NEI Elect Power Engn, Denver, CO 80001 USA. EM kmalmedal@neiengineering.com; benjamin_kroposki@nrel.gov; psen@mines.edu FU IUCRC Power Systems Research Center (PSerc) FX This work was supported in part by the IUCRC Power Systems Research Center (PSerc). NR 13 TC 0 Z9 0 U1 0 U2 4 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1932-5517 BN 978-1-4244-1296-9 J9 IEEE POWER ENG SOC PY 2007 BP 3588 EP 3595 PG 8 WC Engineering, Electrical & Electronic SC Engineering GA BGY37 UT WOS:000251345403112 ER PT S AU Hammerstrom, DJ AF Hammerstrom, Donald J. GP IEEE TI Ac versus dc distribution systems - Did we get it right? SO 2007 IEEE POWER ENGINEERING SOCIETY GENERAL MEETING, VOLS 1-10 SE IEEE Power Engineering Society General Meeting LA English DT Proceedings Paper CT IEEE-Power-Engineering-Society General Meeting CY JUN 24, 2007 CL Tampa, FL SP IEEE Power Engn Soc DE dc power systems; energy conversion; energy management; energy storage; power distribution; power distribution economics; power supplies; power system economics ID POWER AB We presently enjoy a predominantly ac electrical distribution system, the engineering basis for which was designed over 100 years ago. While ac distribution systems have served us well, we should periodically pause to assess what opportunities we have accepted or been denied by the overwhelming predominance of ac electrical power distribution systems. What opportunities could be obtained by engineering do distribution into at least portions of our present system? What advantages of the present ac distribution system should be recognized and protected? This paper will focus on distribution within premise and low-voltage distribution systems. Specifically, we will address the conversion efficiency costs of adopting various premise ac and do distribution system topologies. According to a simple predictive model formulated in this paper, premise residential do distribution will incur unfavorable total conversion efficiency compared with existing ac premise distribution. However, if a residence is supplied by a fuel cell or another do generator, the total conversion efficiency within a residential do distribution system could be similar to, or even better than, that for ac distribution. C1 Pacific NW Natl Lab, Energy Sci & Technol Div, Richland, WA 99352 USA. RP Hammerstrom, DJ (reprint author), Pacific NW Natl Lab, Energy Sci & Technol Div, POB 999,MSIN-K1-85, Richland, WA 99352 USA. EM donald.hammerstrom@pnl.gov 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 1932-5517 BN 978-1-4244-1296-9 J9 IEEE POWER ENG SOC PY 2007 BP 3997 EP 4001 PG 5 WC Engineering, Electrical & Electronic SC Engineering GA BGY37 UT WOS:000251345404005 ER PT S AU Nutaro, J Kuruganti, PT Miller, L Mullen, S Shankar, M AF Nutaro, James Kuruganti, Phani Teja Miller, Laurie Mullen, Sara Shankar, Mallikarjun GP IEEE TI Integrated hybrid-simulation of electric power and communications systems SO 2007 IEEE POWER ENGINEERING SOCIETY GENERAL MEETING, VOLS 1-10 SE IEEE Power Engineering Society General Meeting LA English DT Proceedings Paper CT IEEE-Power-Engineering-Society General Meeting CY JUN 24, 2007 CL Tampa, FL SP IEEE Power Engn Soc AB The modern power grid is strongly integrated with its communication network. While a power system primarily consists of elements that are modeled by continuous equations, a communication system has discrete event dynamics. We model the integrated operation of these two systems with a hybrid modeling and simulation technique. Systematically combining continuous and discrete event system models is necessary for correctly simulating critical system behaviors. This paper discusses an approach based on the Discrete Event System Specification (DEVS) that characterizes the interaction of the two systems formally to preserve simulation correctness. We demonstrate the implementation of our integrated hybrid simulation technique with detailed generator and network models in a wide-area cooperative automatic load-control scenario. C1 [Nutaro, James; Kuruganti, Phani Teja; Shankar, Mallikarjun] Oak Ridge Natl Lab, Computat Sci & Engn Div, Oak Ridge, TN 37831 USA. [Miller, Laurie; Mullen, Sara] Univ Minnesota, Dept Elect & Comp Engn, Minneapolis, MN 55455 USA. RP Nutaro, J (reprint author), Oak Ridge Natl Lab, Computat Sci & Engn Div, Oak Ridge, TN 37831 USA. EM nutarojj@ornl.gov; kurugantipv@ornl.gov; shankarm@ornl.gov; mill0660@umn.edu; mull0197@umn.edu RI Shankar, Mallikarjun/N-4400-2015 OI Shankar, Mallikarjun/0000-0001-5289-7460 FU Laboratory Directed Research and Development Program of Oak Ridge National Laboratory (ORNL); U.S. Department of Energy [DE-AC05-00OR22725]; U.S. Government [DE-AC05-00OR22725] FX Research sponsored by the Laboratory Directed Research and Develop- ment Program of Oak Ridge National Laboratory (ORNL), managed by UT-Battelle, LLC for the U.S. Depa rtment of Energy under Contract No. DE-AC05-00OR22725. The submitted manuscript has been authored by a contractor of the U.S. Government under Contract DE-AC05-00OR22725. Accordingly, the U.S. Government reta ins a nonexclusive, royalty-free license to publish or reproduce the published form of this contribution, or allow others to do so, for U.S. Government purposes. 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 1932-5517 BN 978-1-4244-1296-9 J9 IEEE POWER ENG SOC PY 2007 BP 4418 EP + PG 3 WC Engineering, Electrical & Electronic SC Engineering GA BGY37 UT WOS:000251345404077 ER PT S AU Kirby, BJ AF Kirby, B. J. GP IEEE TI Load response fundamentally matches power system reliability requirements SO 2007 IEEE POWER ENGINEERING SOCIETY GENERAL MEETING, VOLS 1-10 SE IEEE Power Engineering Society General Meeting LA English DT Proceedings Paper CT IEEE-Power-Engineering-Society General Meeting CY JUN 24, 2007 CL Tampa, FL SP IEEE Power Engn Soc DE interconnected power systems; load management; power system control; power system economics; power system planning; power system reliability; power system security AB Responsive load is the most underutilized reliability resource available to the power system. Loads are frequently barred from providing the highest value and most critical reliability services; regulation and spinning reserve. Advances in communications and control technology now make it possible for some loads to provide both of these services. The limited storage incorporated in some loads better matches their response capabilities to the fast reliability-service markets than to the hourly energy markets. Responsive loads are frequently significantly faster and more accurate than generators, increasing power system reliability. Incorporating fast load response into microgrids further extends the reliability response capabilities that can be offered to the interconnected power system. The paper discusses the desired reliability responses, why this matches some loads' capabilities, what the advantages are for the power system, implications for communications and monitoring requirements, and how this resource can be exploited. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37830 USA. RP Kirby, BJ (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN 37830 USA. EM kirbybj@ieee.org NR 9 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1932-5517 BN 978-1-4244-1296-9 J9 IEEE POWER ENG SOC PY 2007 BP 4541 EP 4546 PG 6 WC Engineering, Electrical & Electronic SC Engineering GA BGY37 UT WOS:000251345404102 ER PT S AU Hawkins, DL Blatchford, J Makarov, YV AF Hawkins, David L. Blatchford, James Makarov, Yuri V. GP IEEE TI Wind integration issues and solutions in California SO 2007 IEEE POWER ENGINEERING SOCIETY GENERAL MEETING, VOLS 1-10 SE IEEE Power Engineering Society General Meeting LA English DT Proceedings Paper CT IEEE-Power-Engineering-Society General Meeting CY JUN 24, 2007 CL Tampa, FL SP IEEE Power Engn Soc DE wind generation; wind energy market; power grid operations AB The purpose of the California ISO intermittent resources program is to ensure the successful integration of wind generation and other renewable resources with the planning, market, and operation of the power grid. This paper addresses the market integration and operational wind integration issues in California and briefly discusses the transmission interconnection issues. C1 [Hawkins, David L.] California Independent Syst Operator Corp, Folsom, CA 95630 USA. [Makarov, Yuri V.] Pacific Northwest Natl Lab, Richland, WA 99352 USA. RP Hawkins, DL (reprint author), California Independent Syst Operator Corp, Folsom, CA 95630 USA. EM dhawkins@caiso.com; jblatchford@caiso.com; yuri.makarov@pnl.gov 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 1932-5517 BN 978-1-4244-1296-9 J9 IEEE POWER ENG SOC PY 2007 BP 4612 EP + PG 3 WC Engineering, Electrical & Electronic SC Engineering GA BGY37 UT WOS:000251345404117 ER PT S AU Huang, Z Cui, Y Xu, WS AF Huang, Zhenyu (Henry) Cui, Yu Xu, Wilsun GP IEEE TI Application of modal sensitivity for power system harmonic resonance analysis SO 2007 IEEE POWER ENGINEERING SOCIETY GENERAL MEETING, VOLS 1-10 SE IEEE Power Engineering Society General Meeting LA English DT Proceedings Paper CT IEEE-Power-Engineering-Society General Meeting CY JUN 24, 2007 CL Tampa, FL SP IEEE Power Engn Soc AB Harmonic resonance is closely related to the singularity of a network admittance matrix. The smallest eigenvalue of the matrix defines the mode of harmonic resonance. This paper applies this eigenvalue theory and proposes a method to determine which network components have significant contributions to a harmonic resonance phenomenon. The basic idea is to calculate the sensitivities of a resonance mode to the parameters of network components. The sensitivity results are then ranked to quantify the impact of each component. In this paper, the eigen-sensitivity theory as applied to harmonic resonance mode analysis is presented. Case studies are used to verify the theory. A practical example is given to illustrate the application of the proposed method. In addition, this paper further conducts extensive comparative analysis on three types of network oriented modal analysis techniques. The results have clarified the similarities and differences among the techniques. C1 [Huang, Zhenyu (Henry)] Pacific Northwest Natl Lab, Richland, WA 99352 USA. [Cui, Yu; Xu, Wilsun] Univ Alberta, Edmonton, AB T6G 2M7, Canada. RP Huang, Z (reprint author), Pacific Northwest Natl Lab, Richland, WA 99352 USA. FU Natural Science and Engineering Research Council of Canada; University of Alberta [TPWRS-00646-2005] FX This work was supported by the Natural Science and Engineering Research Council of Canada and was conducted at the University of Alberta. Paper no. TPWRS-00646-2005. 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 1932-5517 BN 978-1-4244-1296-9 J9 IEEE POWER ENG SOC PY 2007 BP 4935 EP 4935 PG 1 WC Engineering, Electrical & Electronic SC Engineering GA BGY37 UT WOS:000251345404170 ER PT B AU Matzen, MK AF Matzen, M. K. GP IEEE TI Pulsed power sciences at Sandia national laboratories - The next generation SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis ID PINCH-DRIVEN HOHLRAUMS; SHOCK-WAVE COMPRESSION; EQUATION-OF-STATE; FUSION CAPSULE IMPLOSIONS; HIGH-ENERGY; RADIATION SYMMETRY; LIQUID DEUTERIUM; SOLID DEUTERIUM; ICF EXPERIMENTS; Z-BEAMLET AB A combination of theory, simulation, and high-quality experiments has enabled significant progress in many high energy density science applications. While the recent science and engineering of pulsed power has been focused on the refurbishment of Z and developing advanced radiographic capabilities, discovery and innovation in the fundamental architecture of pulsed power systems have also made significant advances. This progress started in 1996 when the Particle Beam Fusion Accelerator (PBFA II), which began operation in 1985, was converted to the Z facility. The Z Refurbishment (ZR) project began six years later, driven by the need for more capacity (the ability to perform more experiments), improved precision (more precise pulse shaping, longer pulses, and reduced jitter), and more capability (higher energy delivered to the load and better diagnostic access). Over the past year, the Z facility was completely dismantled and rebuilt with newly designed components within the same basic 36-module architecture. With the completion of this project in 2007, the pulsed power sciences program at Sandia will work with many collaborators to apply this new capability to many areas of high energy density science, including z-pinch-driven inertial confinement fusion, dynamic materials properties, and radiation hydrodynamics. This paper summarizes recent and planned research on the Z facility, the ZR Project, advances in high-photon-energy radiography, derivative applications of the pulsed power program, and advances in the science of pulsed power that could revolutionize the next-generation facilities. C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Matzen, MK (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. EM mkmatze@sandia.gov NR 124 TC 1 Z9 1 U1 0 U2 4 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0913-6 PY 2007 BP 1 EP 15 DI 10.1109/PPPS.2007.4651779 PG 15 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300001 ER PT B AU Moses, EI AF Moses, Edward I. GP IEEE TI The National Ignition Facility and the golden age of high energy density science SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis AB The National Ignition Facility (NIF) is a 192-beam Nd:glass laser facility being constructed at the Lawrence Livermore National Laboratory (LLNL) to conduct research in inertial confinement fusion (ICF) and high energy density (BED) science. When completed, NIF will produce 1.8 MJ, 500 TW of ultraviolet light, making it the world's largest and highest-energy laser system. The NIF is poised to become the world's preeminent facility for conducting ICF and fusion energy research and for studying matter at extreme densities and temperatures. C1 Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Moses, EI (reprint author), Lawrence Livermore Natl Lab, Livermore, CA 94550 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 BN 978-1-4244-0913-6 PY 2007 BP 16 EP 19 DI 10.1109/PPPS.2007.4651780 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300002 ER PT B AU Given, MJ Timoshkin, IV Wilson, MP MacGregor, SJ Lehr, JM AF Given, M. J. Timoshkin, I. V. Wilson, M. P. MacGregor, S. J. Lehr, J. M. GP IEEE TI Analysis of the current waveforms observed in underwater spark discharges SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis ID HIGH-POWER ULTRASOUND AB The dynamic behaviour of the resistance of a circuit consisting of a capacitive pulse power supply with a load consisting of a plasma channel formed in an underwater gap has been determined from the current transients measured during the breakdown of the gap. C1 [Given, M. J.; Timoshkin, I. V.; Wilson, M. P.; MacGregor, S. J.] Univ Strathclyde, Inst Energy & Environm, 204 George St, Glasgow G1 1XW, Lanark, Scotland. [Lehr, J. M.] Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Given, MJ (reprint author), Univ Strathclyde, Inst Energy & Environm, 204 George St, Glasgow G1 1XW, Lanark, Scotland. EM m.given@eee.strath.ac.uk OI Wilson, Mark/0000-0003-3088-8541 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 BN 978-1-4244-0913-6 PY 2007 BP 37 EP + DI 10.1109/PPPS.2007.4651785 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300007 ER PT B AU Idzorek, GC Tierney, TE Watt, RG AF Idzorek, G. C. Tierney, T. E. Watt, R. G. GP IEEE TI Radiation measurement accuracy of Z-dynamic hohlraums SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis ID X-RAY DIODE AB As calculational capabilities mature the data accuracy requirements become more stringent. Typical Z-pinch power measurements use multiple sets of filtered X-Ray Diodes' (XRD) to provide temporally and spectrally resolved information on the pinch performance within a +/- 12% error bar. Integrated power measurements are provided by Ni-foil bolometers(2) with +/- 10% accuracy Los Alamos has performed 75 experiments at the Sandia Z-machine in which both XRD's and bolometers viewed a Trad > 150 eV radiation source. Comparison between the diagnostics revealed puzzling discrepancies of up to a factor of two. Closer examination of the XRD's and bolometers reveals fabrication, material properties, calibration, and analysis subtleties that may account for the differences. Assumptions of constant Cp and linear resistance changes are invalid if the bolometer heating is too great. Also if the element is heated to its Curie temperature non-linear behavior occurs. Furthermore, the thin film properties of the nickel bolometer element can vary greatly from the bulk material properties. For the XRD's, the photoemissive surface properties of the cathodes can be altered as they are used in a high x-ray fluence and dirty vacuum environment. The x-ray filters can also be damaged from x-ray heating and blast debris. How filters are characterized and calibrated can also be an issue. We present the methods used to construct, calibrate the detectors, field the experiment, and analyze data in order to quantify the error bars on the measurements. C1 [Idzorek, G. C.; Tierney, T. E.; Watt, R. G.] Los Alamos Natl Lab, Los Alamos, NM USA. RP Idzorek, GC (reprint author), Los Alamos Natl Lab, POB 1663,Mail Stop D-410, Los Alamos, NM 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 BN 978-1-4244-0913-6 PY 2007 BP 49 EP 52 DI 10.1109/PPPS.2007.4651788 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300010 ER PT B AU Swalby, ME Glover, SF Zutavern, FJ Reed, KW Cich, MJ Mar, A Saiz, TA Horry, ML White, FE AF Swalby, M. E. Glover, S. F. Zutavern, F. J. Reed, K. W. Cich, M. J. Mar, A. Saiz, T. A. Horry, M. L. White, F. E. GP IEEE TI A test facility for PCSS triggered pulsed power switches SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis AB The cost and complexity of pulsed power systems continue to increase as researchers strive for more precise control and flexibility. Systems with large numbers of switches or large numbers of switch trigger times result in the need for more cost effective high performance triggering systems. This need can be addressed by photoconductive semiconductor switches (PCSS) that have demonstrated sub-nanosecond jitter with up to 300kV switches. Previous work has motivated continued research into the trigger system parameters that allow for reliable cost effective operation. To support this research a test-bed has been developed to allow testing with a variety of high voltage switches (HVSs) and switch configurations. The multiple sub-systems used in this test bed include: (1) the laser diode array (LDA) driver circuit, (2) the PCSS trigger circuit, and (3) the circuit that is switched by the HVS. Items of particular interest are: (1) the benefits and issues with pulse charging vs. DC charging the PCSS trigger system, (2) fiber coupled versus multi-filament laser diode PCSS triggering, (3) high bandwidth diagnostics to measure and determine the impact of sub-nanosecond rise time and jitter triggers for the HVS, and (4) the PCSS trigger circuits required to determine minimum voltage, current, and pulse width for optimal HVS triggering. Our testbed consists of, a single brick, from a linear transformer driver housing two 40 nF capacitors, the HVS being tested. Low inductance HVSs that can handle +/-100 kVDC and 50 kA are being tested with this system. The laser diode array that triggers the PCSS can be located at the PCSS or in the screen room. The LDA is driven by a low energy avalanche trigger circuit that can be optically triggered and floated to the potential of the HVS. This paper describes the requirements, methods, and the apparatus developed to determine the PCSS minimum electro-optical requirements for optimal HVS triggering. Specific current and voltage waveforms obtained from the sub-systems will be discussed along with the parameters adjusted to deliver a range of pulse widths, rise times, and energies to the HVS. C1 [Swalby, M. E.; Glover, S. F.; Zutavern, F. J.; Reed, K. W.; Cich, M. J.; Mar, A.; Saiz, T. A.; Horry, M. L.] Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. [White, F. E.] Ktech Corp Inc, Albuquerque, NM 87123 USA. RP Swalby, ME (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. EM fjzutav@sandia.gov FU United States Department of Energy [DE-AC04-94AL85000] FX Sandia National Laboratories is a multi-program laboratory operated by Sandia Corporation for the United States Department of Energy under Contract DE-AC04-94AL85000. 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 BN 978-1-4244-0913-6 PY 2007 BP 101 EP + DI 10.1109/PPPS.2007.4651799 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300021 ER PT B AU Saiz, TA Zutaverut, FJ Glover, SF Reed, KW Cich, MJ Mar, A Swalby, ME Horry, ML AF Saiz, T. A. Zutaverut, F. J. Glover, S. F. Reed, K. W. Cich, M. J. Mar, A. Swalby, M. E. Horry, M. L. GP IEEE TI Pcss lifetime testing for pulsed power applications SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis AB Trigger systems are becoming increasingly important in pulsed power systems with large numbers of high voltage switches (HVSs) or large numbers of different switching times. Performance can be critical with demands for fast rise-times, sub-nanosecond jitter, and long lifetimes. In particular component lifetimes affect maintenance costs and the available operational time of the system. High gain photoconductive semiconductor switches (PCSSs) deliver many of the desired properties including optical-isolation, 350 ps risetime, 100 ps rms jitter, scalability to high power (220 kV and 8 kA demonstrated), and device lifetimes up to 108 shots with 21 A per filament in 5 ns wide pulses [1], [2]. However, higher current and longer pulse applications can drastically reduce device lifetime. For typical single shot pulsed power applications, lifetimes of several thousand shots are required and much longer-lived HVSs are required for repetitive pulsed power applications. The key parameters that impact PCSS lifetime are voltage, current, and pulse width. Voltage affects the lifetime of a lateral switch when the electric field near the surface of the switch approaches the surface breakdown limit, which is approximately 100 kV/cm for sub-millimeter pulse charged PCSSs (similar to 70 kV/cm for larger ones) under transformer oil or Fluorinert (a liquid dielectric). The current in high-gain GaAs PCSS always forms filaments, so this lifetime dependence can be considered in terms of the current per filament, and most of our lifetime testing is done with PCSS producing a single main filament. Since PCSS can have sub-nanosecond risetime and jitter, most of our interest in lifetime is for switches that produce 1-100 ns long pulses. These requirements lead us to testing high gain PCSS in high speed, 50 ohm transmission line, discharge circuits that can deliver up to 300 A. Control of the PCSS is achieved with a fiber-coupled laser directed between the PCSS metal contact pads resulting in one randomly formed primary filament. Devices demonstrating long lifetimes are operated at up to a few kilohertz, whereas higher current and longer pulse tests are operated at lower repetition rates. In all cases, rep-rates are below the limit where bubbles or particles form in the liquid dielectric. New PCSSs are always tested at 20 A for direct comparison to the lifetime data that we have accumulated over the last 20 years. Higher current tests are performed to predict switch lifetimes for specific applications that don't require such long device lifetimes. This paper will discuss testing procedures, circuits, and dramatic changes in PCSS component lifetime due to contact methods (e.g. soldering versus ribbon bonding). C1 [Saiz, T. A.; Zutaverut, F. J.; Glover, S. F.; Reed, K. W.; Cich, M. J.; Mar, A.; Swalby, M. E.; Horry, M. L.] Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Saiz, TA (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. NR 8 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0913-6 PY 2007 BP 106 EP 109 DI 10.1109/PPPS.2007.4651800 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300022 ER PT B AU Ormond, E Molina, I Cordova, S Nelson, D Smith, J Corrow, G Hansen, M Henderson, D Mitton, C AF Ormond, E. Molina, I. Cordova, S. Nelson, D. Smith, J. Corrow, G. Hansen, M. Henderson, D. Mitton, C. GP IEEE TI Cygnus diverter switch analysis SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis AB The Cygnus Dual Beam Radiographic Facility consists of two 2.25-MV, 60-kA, 50-ns x-ray sources fielded in an underground laboratory at the Nevada Test Site. The tests performed in this laboratory involve study of the dynamic properties of plutonium and are called subcritical experiments. From end-to-end, the Cygnus machines utilize the following components: Marx generator, water-filled pulse-forming line (PFL), water-filled coaxial transmission line (WTL), 3-cell inductive voltage adder (IVA), and rod-pinch diode. The upstream WTL interface to the PFL is via a radial insulator with coaxial geometry. The downstream WTL terminates in a manifold where the center conductor splits into three lines which individually connect to each of the IVA cell inputs. There is an impedance mismatch at this juncture. It is a concern that a reflected pulse due to anomalous behavior in the IVA or diode might initiate breakdown upon arrival at the upstream PFL/WTL insulator. Therefore near the beginning of the WTL a radial diverter switch is installed to protect the insulator from over voltage and breakdown. The diverter has adjustable gap spacing, and an in-line aqueous-solution (sodium thiosulfate) resistor array for energy dissipation. There are capacitive voltage probes at both ends of the WTL and on the diverter switch. These voltage signals will be analyzed to determine diverter performance. Using this analysis the usefulness of the diverter switch will be evaluated. C1 [Ormond, E.; Molina, I.; Cordova, S.; Nelson, D.] Sandia Natl Labs, POB 238,Mail Stop 944, Mercury, NV 89023 USA. [Smith, J.] Los Alamos Natl Lab, Los Alamos, NM 87545 USA. [Corrow, G.; Hansen, M.; Henderson, D.; Mitton, C.] Natl Secur Technol, Las Vegas, NV 89030 USA. RP Ormond, E (reprint author), Sandia Natl Labs, POB 238,Mail Stop 944, Mercury, NV 89023 USA. EM eormond@sandia.gov FU United States Department of Energy's National Nuclear Security Administration [DE-AC04-94AL85000] FX Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the United States Department of Energys National Nuclear Security Administration under Contract DE-AC04-94AL85000. 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 BN 978-1-4244-0913-6 PY 2007 BP 120 EP + DI 10.1109/PPPS.2007.4651803 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300025 ER PT B AU Hahn, K Woodworth, JR Clark, WT Blickem, JR Starbird, R Hardin, MJ Maron, Y AF Hahn, K. Woodworth, J. R. Clark, W. T. Blickem, J. R. Starbird, R. Hardin, M. J. Maron, Y. GP IEEE TI Spectroscopic studies of gas switches for linear transformer drivers SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis AB Gas switches, whether pulse-triggered or laser-triggered, have been used reliably with low jitter for various pulsed power drivers. We are investigating the emission spectrum of the breakdown arcs in several novel air-filled, pulse-triggered switches for Linear Transformer Drivers (LTDs). In addition, we are investigating the spectrum of a laser-produced arc in SF6 since these laser-produced arcs are used to trigger the 6-MV gas switches being designed for an upgrade to Sandia's Z-machine. Electrical, spectroscopic, and highspeed camera diagnostics are employed to study the underlying physics that governs the switch operation. For the switch studies, in air and SF6, the optical spectrum which covers the visible and near UV range is dominated by continuum emission. Temperature calculations, based on blackbody emission curves, are reported. C1 [Hahn, K.; Woodworth, J. R.; Clark, W. T.] Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. [Blickem, J. R.] Ktech Corp Inc, Albuquerque, NM 87123 USA. [Starbird, R.; Hardin, M. J.] NSTech, Los Alamos, NM 87544 USA. [Maron, Y.] Weizmann Inst Sci, Rehovot, Israel. RP Hahn, K (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. EM kdhahn@sandia.gov FU United States Department of Energy's National Security Administration [DE-AC04-94-AL85000] FX Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the United States Department of Energys National Security Administration under Contract DE-AC04-94-AL85000. 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 BN 978-1-4244-0913-6 PY 2007 BP 125 EP + DI 10.1109/PPPS.2007.4651804 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300026 ER PT B AU Clark, WT Savage, ME Bliss, DE Stoltzfus, BS Woodworth, JR Gilmore, M AF Clark, W. T. Savage, M. E. Bliss, D. E. Stoltzfus, B. S. Woodworth, J. R. Gilmore, Mark GP IEEE TI Analysis of a laser induced plasma in high pressure SF6 gas SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis AB The Laser Triggered Switch Program at Sandia National Laboratories is an intensive development study to understand and optimize the laser triggered gas switch (LTGS) for the Z-Refurbishment (ZR) project. The laser triggered gas switch is the final command-triggered switch in the machine. Reliability and performance of the switch is crucial. A modified LTGS trigger section with optical viewing windows perpendicular to laser propagation is used to analyze a laser induced plasma spark in sulfur hexafluoride (SF,) gas in order to quantify parameters such as spark length and plasma temperature. The laser spark is created through a focusing lens by the fourth-harmonic (266nm) of a 5ns FWHM pulsed Nd: YAG laser with 30mJ maximum energy output. Several diagnostic methods are used to analyze the laser spark. Visible spark length measurements are made using a CCD camera at gas pressures ranging from sub-atmosphere to 4 atmospheres. Differing focal length lenses are compared to determine optimal visible spark length for a given gas pressure. Spark length is used as an indicator of the ability of a switch to trigger at a given gas pressure and charge voltage. Typically, the visible spark length must be at least 25% of the electrode gap spacing to produce acceptable switch run-time and jitter. In addition, spark lengths were found using laser schlieren and by a capacitive diagnostic. C1 [Clark, W. T.; Savage, M. E.; Bliss, D. E.; Stoltzfus, B. S.; Woodworth, J. R.; Gilmore, Mark] Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. RP Clark, WT (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. FU United States Department of Energy's National Nuclear Security Administration [DE-AC04-94AL85000] FX Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the United States Department of Energys National Nuclear Security Administration under contract DE-AC04-94AL85000. 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 978-1-4244-0913-6 PY 2007 BP 129 EP + DI 10.1109/PPPS.2007.4651805 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300027 ER PT B AU MacGregor, SJ Timoshkin, IV Given, MJ Fouracre, RA Lehr, JM Warne, LK AF MacGregor, S. J. Timoshkin, I. V. Given, M. J. Fouracre, R. A. Lehr, J. M. Warne, L. K. GP IEEE TI Factors affecting the operation of laser-triggered gas switch (LTGS) with multi-electrode spark gap SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis AB Multi-electrode spark switches can be used for switching applications at elevated voltages or for command triggering. Symmetrical field graded electrodes allow the electrical stress across individual gaps to be controlled, thus maximising the hold off voltage and reducing switch pre-fire. The paper considers some aspects of multielectrode switch design and their influence on switching behavior. Non-symmetrical, uni-directional electrode topologies can be employed with advantages over traditional symmetrical design. The choice of working gas and gas pressure can influence switching performance in terms of delay-time and jitter. Transient analysis of switch characteristics has been undertaken in order to understand multi-electrode switching. C1 [MacGregor, S. J.; Timoshkin, I. V.; Given, M. J.; Fouracre, R. A.] Univ Strathclyde, Inst Energy & Environm, 204 George St, Glasgow G1 1XW, Lanark, Scotland. [Lehr, J. M.; Warne, L. K.] Sandia Natl Labs, Albuquerque, NM 87185 USA. RP MacGregor, SJ (reprint author), Univ Strathclyde, Inst Energy & Environm, 204 George St, Glasgow G1 1XW, Lanark, Scotland. EM sjm@eee.strath.ac.uk 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 BN 978-1-4244-0913-6 PY 2007 BP 140 EP + DI 10.1109/PPPS.2007.4651808 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300030 ER PT B AU Kim, A Sinebryukhov, V Kovalchuk, B Bastrikov, A Durakov, V Volkov, S Frolov, S Alexeenko, V Mazarakis, M McDaniel, D Olson, C Struve, K Gilgenbach, R AF Kim, A. Sinebryukhov, V. Kovalchuk, B. Bastrikov, A. Durakov, V. Volkov, S. Frolov, S. Alexeenko, V. Mazarakis, M. McDaniel, D. Olson, C. Struve, K. Gilgenbach, R. GP IEEE TI Design and first tests of five 100 GW fast LTD cavities into an e-beam diode load SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis AB A module consisting of five 100 GW Fast LTD cavities stacked in series was tested with e-beam diode load to study how a number of cavities behave and add their energy, power and voltage output in a voltage adder configuration assembly. In this report we present the design of the module and diode, and compare test results with simulations. C1 [Kim, A.; Sinebryukhov, V.; Kovalchuk, B.; Bastrikov, A.; Durakov, V.; Volkov, S.; Frolov, S.; Alexeenko, V.] Inst High Current Elect, Academichesky Ave 2-3, Tomsk 634055, Russia. [Mazarakis, M.; McDaniel, D.; Olson, C.; Struve, K.] Sandia Natl Labs, Albuquerque, NM 87185 USA. [Gilgenbach, R.] Univ Michigan, Ann Arbor, MI 48109 USA. RP Kim, A (reprint author), Inst High Current Elect, Academichesky Ave 2-3, Tomsk 634055, Russia. EM kim@oit.hcei.tsc.ru FU Sandia National Laboratory [DE-AC04-94AL85000] FX Work supported by Sandia National Laboratory under the Contract DE-AC04-94AL85000. 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. 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 BN 978-1-4244-0913-6 PY 2007 BP 144 EP + DI 10.1109/PPPS.2007.4651809 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300031 ER PT B AU Gomez, MR Gilgenbach, RM Lau, YY Tang, W Zier, JC Mazarakis, MG Cuneo, ME Mehlhorn, TA Stygar, WA AF Gomez, M. R. Gilgenbach, R. M. Lau, Y. Y. Tang, W. Zier, J. C. Mazarakis, M. G. Cuneo, M. E. Mehlhorn, T. A. Stygar, W. A. GP IEEE TI Design of a MITL for a 1 MA LTD driving a wire array z-pinch load SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis AB A self-magnetically insulated transmission line (MITL) has been designed to transmit a I MA, 100 kV pulse with a 100 ns (100/6-90%) rise-time from a Linear Transformer Driver (LTD) to a wire array z-pinch load. The transmission line has three stages: a coaxial line, followed by a radial line, and finally a conical line to the load. This transmission line geometry was chosen to ease construction and to lower cost while maintaining a low inductance. A collisionless magnetic insulation model was used to determine the lower limit of the anode-cathode gap for the transmission line. Additional designs were investigated assuming vacuum insulation with limiting electric fields of 100 kV/cm and 200 kV/cm in the transmission line. The transmission line inductance in each of these cases was calculated analytically, and a PSpice simulation of the circuit was used to compare the performance of the designs. Assuming the z-pinch load inductance was approximately 3 nH, the collisionless magnetic insulation model met the goal of a 1 MA pulse with a 100 ns rise-time. The vacuum insulation designs did not meet these requirements. The anode-cathode gap in the magnetic insulation design was expanded such that the current pulse shape still met the design goals and a safety factor was added to reduce the possibility of arcing. This MITL design will be constructed and implemented on the Michigan Accelerator for Inductive Z-pinch Experiments (MAIZE) being constructed in 2007 at the University of Michigan. C1 [Gomez, M. R.; Gilgenbach, R. M.; Lau, Y. Y.; Tang, W.; Zier, J. C.] Univ Michigan, Nucl Engn & Radiol Sci Dept, Plasma Pulsed Power & Microwave Lab, Ann Arbor, MI 48109 USA. [Mazarakis, M. G.; Cuneo, M. E.; Mehlhorn, T. A.; Stygar, W. A.] Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Gomez, MR (reprint author), Univ Michigan, Nucl Engn & Radiol Sci Dept, Plasma Pulsed Power & Microwave Lab, Ann Arbor, MI 48109 USA. EM mrgomez@umich.edu FU U.S. DoE through Sandia National Laboratories to the University of Michigan [240985]; Sandia is a multiprogram laboratory operated by Sandia Corporation; Lockheed Martin Company, for the United States Department of Energy's National Nuclear Security [DE-AC04- 94AL85000] FX This work was supported by U.S. DoE through Sandia National Laboratories award number 240985 to the University of Michigan. Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the United States Department of Energys National Nuclear Security Administration under Contract DE-AC04- 94AL85000. NR 7 TC 0 Z9 0 U1 0 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0913-6 PY 2007 BP 152 EP + DI 10.1109/PPPS.2007.4651811 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300033 ER PT B AU White, FE Glover, SF Reed, KW Harden, MJ AF White, F. E. Glover, S. F. Reed, K. W. Harden, M. J. GP IEEE TI Current adder with programmable pulse shaping SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis AB Advancements in fusion research and Equation of State (EOS) experiments have led to a need for greater control over the shape of the current waveform in the load. This added complexity will necessitate more sophisticated pulsed power designs. Challenges introduced by these new systems include the requirement for more elaborate control systems to accommodate multiple independent switching times and an improved understanding of how dwell times and jitter affect performance. A subscale programmable current adder has been built to investigate the issues. This system has six independently programmable bricks and is capable of achieving peak currents greater than 2 kA. The bricks were characterized and modeled as a prerequisite to the application of genetic algorithms (GA's) to determine the required initial conditions, switch triggering times and the brick charge voltages necessary to achieve commanded current shapes. This paper presents a description of the system control, circuit topology, solid-state triggering, charging systems, and system characterization. All of these system parameters are discussed within the context of commanded and measured output currents. C1 [White, F. E.] Ktech Corp Inc, Albuquerque, NM 87123 USA. [Glover, S. F.; Reed, K. W.] Sandia Natl Labs, Albuquerque, NM 87185 USA. [Harden, M. J.] Natl Secur Technol LLC, Los Alamos, NM 87544 USA. RP White, FE (reprint author), Ktech Corp Inc, Albuquerque, NM 87123 USA. EM sfglove@sandia.gov FU Sandia National Laboratories is a multi-program laboratory operated by Sandia Corporation for the United States Department of Energy [DE-AC04-94AL85000] FX Sandia National Laboratories is a multi-program laboratory operated by Sandia Corporation for the United States Department of Energy under Contract DE-AC04-94AL85000. 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 BN 978-1-4244-0913-6 PY 2007 BP 156 EP + DI 10.1109/PPPS.2007.4651812 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300034 ER PT B AU Martin, JP Savage, ME Pointon, TD Gilmore, MA AF Martin, Jeremy P. Savage, Mark E. Pointon, Timothy D. Gilmore, Mark A. GP IEEE TI Precision electron flow measurements in a disk transmission line SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis ID IMPEDANCE AB There have been several models which have been successful in characterizing many aspects of the electron flow in simple self-insulated geometries. For complicated structures, which are typically found in actual systems particle-in-cell (PIC) calculations are used. These simulation models have demonstrated a fundamental difficulty in resolving the electron flow in strongly insulated systems. When the electron flow is confined to a very small sheath size, relative to the transmission line gap, finer meshing must be applied near the cathode surface. This increase in cells can lead to inadequate resolution through a process known as "numerical heating". Precise measurements of these electron flows, typically found in low-impedance driven loads, are essential in providing a benchmark for these widely used simulation techniques. Detailed measurements conducted on a low-impedance disk transmission line provide a useful comparison between the theoretical models and the simulation results. In addition a method for directly measuring the electron current at the load of a strongly insulated system is developed. This would circumvent the difficulty of typical diagnostic methods in resolving these electron flows which are usually minimized for optimal efficiency. C1 [Martin, Jeremy P.; Gilmore, Mark A.] Univ New Mexico, MSC01 1100 1, Albuquerque, NM 87131 USA. [Savage, Mark E.; Pointon, Timothy D.] Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Martin, JP (reprint author), Univ New Mexico, MSC01 1100 1, Albuquerque, NM 87131 USA. FU Sandia Corporation, a Lockheed Martin Company, For the United States Department of Energy's National Nuclear Security [DE-AC04-94AL85000] FX Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company, For the United States Department of Energys National Nuclear Security Administration Under contract DE-AC04-94AL85000. 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 BN 978-1-4244-0913-6 PY 2007 BP 161 EP + DI 10.1109/PPPS.2007.4651813 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300035 ER PT B AU Pointon, TD Langston, WL Savage, ME AF Pointon, T. D. Langston, W. L. Savage, M. E. GP IEEE TI Computer simulations of the magnetically insulated transmission lines and post-hole convolute of ZR SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis ID IN-CELL SIMULATIONS AB An important consideration for the success of the ZR project, refurbishing the Z accelerator at Sandia National Laboratories, is limiting current loss in the vacuum section, ideally to no worse than the 5 - 10% seen on Z. The primary source for this loss is electrons flowing into the post-hole convolute from the four magnetically insulated transmission lines (MITLs). The MITLs on ZR have larger gaps to reduce the electron flow to values comparable to Z when operating at similar to 40% higher voltage and similar to 30% higher current. Electron flow in the vacuum section is analyzed with electromagnetic, particle-in-cell simulations, using two complementary simulation setups. First, the exact MITL profiles are modeled with high-resolution 2-D simulations out to large radius (typically r = 60 cm), providing accurate values for the electron flow into the convolute. Second, the convolute is modeled in 3-D, but with MIT`Ls extending out only to r similar to 30 cm. The 3-D MITL geometry is modified to provide the same electron flow into the convolute as the 2-D simulations. The 3-D simulations have detailed diagnostics for current loss and surface deposition heating in the convolute. C1 [Pointon, T. D.; Langston, W. L.; Savage, M. E.] Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Pointon, TD (reprint author), Sandia Natl Labs, POB 5800,Mail Stop 1152, Albuquerque, NM 87185 USA. NR 14 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0913-6 PY 2007 BP 165 EP 170 DI 10.1109/PPPS.2007.4651814 PG 6 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300036 ER PT B AU Rose, DV Welch, DR Hughes, TP Clark, RE Mostrom, CB Stygar, WA AF Rose, D. V. Welch, D. R. Hughes, T. P. Clark, R. E. Mostrom, C. B. Stygar, W. A. GP IEEE TI Plasma formation, evolution, and dynamics in 100 TW vacuum-transmission-line post-hole convolutes SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis AB Post-hole convolutes are used in high-power transmission-line systems to join several individual transmission lines in parallel. Such convolutes transfer the currents of the lines to a single transmission line, that in turn delivers the combined current to the load. Magnetic insulation of electron flow, established upstream of the convolute, is lost at the convolute due, in part, to the formation of magnetic nulls. This loss of insulation results in current losses. At very high-power operating levels, the formation of electrode plasmas is considered likely. This work examines the evolution and dynamics of cathode plasmas in the transmission-line/double-post-hole convolute configuration used on the Z machine. The results of these simulations suggest that net electron-flow-current losses due to cathode plasma evolution in the vicinity of the post-hole convolutes can be of order 2 MA out of a total system current of similar to 18.5 MA, consistent with measurements. C1 [Rose, D. V.; Welch, D. R.; Hughes, T. P.; Clark, R. E.; Mostrom, C. B.] Voss Sci LLC, 418 Washington St,SE, Albuquerque, NM 87108 USA. [Stygar, W. A.] Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Rose, DV (reprint author), Voss Sci LLC, 418 Washington St,SE, Albuquerque, NM 87108 USA. EM david.rose@vosssci.com FU Sandia National Laboratories; Lockheed Martin Company, for the United States Department of Energy 's National Nuclear Security [DE-AC04-94-AL85000] FX Work was support by Sandia National Laboratories. Sandia is a multi-program laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the United States Department of Energy s National Nuclear Security Administration under contract DE-AC04-94-AL85000. 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 BN 978-1-4244-0913-6 PY 2007 BP 171 EP + DI 10.1109/PPPS.2007.4651815 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300037 ER PT B AU King, J Pasley, J Beg, F Stephens, R Brambrink, E Edens, A Geissel, M Headley, D Rambo, P Schwarz, J Sinars, D AF King, J. Pasley, J. Beg, F. Stephens, R. Brambrink, E. Edens, A. Geissel, M. Headley, D. Rambo, P. Schwarz, J. Sinars, D. GP IEEE TI Commissioning experiments on the 100 TW Sandia laser SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis AB We present results from laser-target interaction experiments performed within the 100 TW facility at Sandia National Laboratory. A series of K-alpha images of 25 mu m thick copper foils reveal an average K-alpha spot diameter of similar to 70 +/- 10 mu m and a pointing error of less than 50 mu m in both the vertical and horizontal directions. 2 omega optical probe pulse shadowgraphy images show front surface plasma growth and transverse focal structure from self-emission. Stacks of radiochromic film (RCF) positioned along the rear normal to the Cu foil indicate an average peak proton energy of 8 +/- 2 MeV. C1 [King, J.; Pasley, J.; Beg, F.] Univ Calif San Diego, La Jolla, CA 92093 USA. [Stephens, R.] Gen Atom, San Diego, CA 92186 USA. [Brambrink, E.; Edens, A.; Geissel, M.; Headley, D.; Rambo, P.; Schwarz, J.; Sinars, D.] Sandia Natl Labs, Albuquerque, NM 87185 USA. RP King, J (reprint author), Univ Calif San Diego, La Jolla, CA 92093 USA. EM jaking@ucsd.edu RI Brennan, Patricia/N-3922-2015 FU fusion science center under DOE [DE-FC02-04ER54789]; Advanced Concept Exploration (ACE) initiative [DE-FG02-05ER54834]; Sandia is a multiprogram laboratory operated by Sandia Corporation; Lockheed Martin Company, for the United States Department of Energy's National Nuclear Security Administration [DE-AC04-94AL85000] FX This work is supported by the fusion science center under DOE contract no. DE-FC02-04ER54789 and by the Advanced Concept Exploration (ACE) initiative under contract no. DE-FG02-05ER54834. Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the United States Department of Energys National Nuclear Security Administration under contract DE-AC04-94AL85000. 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 BN 978-1-4244-0913-6 PY 2007 BP 204 EP + DI 10.1109/PPPS.2007.4651822 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300044 ER PT B AU Mazarakis, MG Fowler, WE McDaniel, DH Olson, CL Rogowski, ST Sharpe, RA Struve, KW Stygar, WA Kim, AA Sinebryukhov, VA Gilgenbach, RM Gomez, MR AF Mazarakis, Michael G. Fowler, William E. McDaniel, Dillon H. Olson, Craig L. Rogowski, Sonrisa T. Sharpe, Robin A. Struve, Kenneth W. Stygar, William A. Kim, Alexander A. Sinebryukhov, Vadim A. Gilgenbach, Ronald M. Gomez, Matthew R. GP IEEE TI High current linear transformer driver (LTD) experiments SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis AB Sandia Laboratories are actively pursuing the development of new accelerators based on the novice technology of Linear Transformer Driver (LTD) [1,2,3]. LTD based drivers are considered for many applications including future very high current Z-pinch ICF (Inertial Confinement Fusion) drivers like ZX and Z-pinch IFE (Inertial Fusion Energy). The high current LTD driver experimental research is concentrated on two aspects; first to study the repetition rate capabilities, life time and jitter of the LTD cavities, and second to study how a number of cavities behave and add their energy, power and voltage output in a voltage adder configuration assembly. The repetition rate and life time studies are being done in the Sandia High Current LTD Laboratory utilizing a prototype 500-kA, 100-kV LTD cavity. The voltage adder experiments are being conducted jointly at the High Current Electronic Institute (HCEI) in Tomsk, Russia where a number of I-MA cavities are being built under Sandia contract. Experimental arrangements and first experimental results are presented and analyzed. C1 [Mazarakis, Michael G.; Fowler, William E.; McDaniel, Dillon H.; Olson, Craig L.; Rogowski, Sonrisa T.; Sharpe, Robin A.; Struve, Kenneth W.; Stygar, William A.] Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. [Kim, Alexander A.; Sinebryukhov, Vadim A.] Inst High Current Electron, Tomsk, Russia. [Gilgenbach, Ronald M.; Gomez, Matthew R.] Univ Michigan, Ann Arbor, MI USA. RP Mazarakis, MG (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. EM mgmazar@sandia.gov FU Sandia is a multiprogram laboratory operated by SandiaCorporation; SandiaCorporation, a Lockheed Martin Copany,for the UnitedStates Department o fEnergy's National Nuclear Security Administration [DE-A04-94AL85000] FX Sandia is a multiprogram laboratory operated by SandiaCorporation, a Lockheed Martin Copany,for the UnitedStates Department o fEnergys National Nuclear Security Administration under Contract DE-A04-94AL85000. 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 BN 978-1-4244-0913-6 PY 2007 BP 222 EP + DI 10.1109/PPPS.2007.4651826 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300048 ER PT B AU Glover, SF Reed, KW White, FE Harden, ML AF Glover, S. F. Reed, K. W. White, F. E. Harden, M. L. GP IEEE TI Genetic optimization for pulsed power system configuration SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis AB Pulsed power systems traditionally have been designed to provide a pulse that is nonprogrammable or requires hardware modifications to adjust the output shape. Advancements in pulsed power technologies are enabling system designs that allow for greater flexibility such as programmable current shaping. Material science, which uses current pulse shaping to obtain data for Equation of State (EOS) analysis, is driving much of this work. Programming of pulsed power systems through the use of a simulation and a manual curve fitting approach can work well for systems that only have a few controllable parameters and simple spectral content. Complex systems with many controllable parameters become unmanageable from a manual trial-and-error perspective. This paper discusses an approach to the optimization of a current adder output using genetic algorithms. The approach to system programmability presented herein will allow for a more simplified user interface and system control as the requirements for flexibility and complexity in future systems increase. C1 [Glover, S. F.; Reed, K. W.] Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. [White, F. E.] Ktech Corp Inc, Albuquerque, NM 87123 USA. [Harden, M. L.] Natl Secur Technol, Albuquerque, NM 87185 USA. RP Glover, SF (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. EM sfglove@sandia.gov FU Sandia National Laboratories; Sandia Corporation for the United States Department of Energy [DE-AC04-94AL85000] FX This work was supported by the Sandia National Laboratories, which is a multiprogram laboratory operated by Sandia Corporation for the United States Department of Energy under Contract DE-AC04-94AL85000. 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 BN 978-1-4244-0913-6 PY 2007 BP 226 EP + DI 10.1109/PPPS.2007.4651827 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300049 ER PT B AU Zutavern, FJ Glover, SF Reed, KW Cich, MJ Mar, A Swalby, ME Saiz, TA Horry, ML Gruner, FR White, FE AF Zutavern, F. J. Glover, S. F. Reed, K. W. Cich, M. J. Mar, A. Swalby, M. E. Saiz, T. A. Horry, M. L. Gruner, F. R. White, F. E. GP IEEE TI PCSS triggered pulsed power switches SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis AB This paper describes results from a 3 year project to develop fiber-optically controlled trigger generators (TG) from high gain photoconductive semiconductor switches (PCSSs) for high voltage switches (HVSs) in pulsed power applications. Triggers for HVSs are critical components for reliable, efficient pulsed power systems because they control the timing synchronization and amplitude variation of multiple pulse forming lines that combine to produce the total output. Proposed pulse power systems are even more dependent on triggering as they consist of many triggered HVSs and produce shaped-pulses by independent timing of the HVSs. The goal of the PCSS TG is to improve precision and replace high voltage trigger cables or line-of-sight optics with fiber optic trigger control. The PCSS trigger has independent EMPfree timing control via 200 mu m optical fibers. This design is simpler because optical isolation allows PCSS triggers to be remotely located at the HVS at any voltage. PCSSs can improve the performance of prime power HVSs, diverters, and diagnostics, by supplying trigger pulses with sub-nanosecond jitter and risetime that are more precise and more easily adjusted than conventional TG. For pulse charged HVSs, the PCSS triggers can generally derive their trigger energy from the stray fields of the HVS. High gain PCSS capabilities [1] for producing pulsed power TG have been demonstrated (not simultaneously): 220 kV, 8 kA, 350 ps risetime, 100 ns pulse width, 50 ps rms jitter, and 10 kHz repetition rate. PCSSs have previously triggered a 300 kV trigatron with 100 ps rms jitter [2]. During this project we have triggered 2 types of DC-charged trigatrons and 2 types of field distortion midplane switches, including a +/- 100 kVDC switch used in the linear transformer driver (LTD) designed at the High Current Electronics Institute (HCEI) [3] with a PCSS triggered trigatron. Results are discussed along with the design requirements, switching properties, and trade-offs for building TGs for DC and pulse-charged HVSs. C1 [Zutavern, F. J.; Glover, S. F.; Reed, K. W.; Cich, M. J.; Mar, A.; Swalby, M. E.; Saiz, T. A.; Horry, M. L.; Gruner, F. R.; White, F. E.] Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Zutavern, FJ (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. EM fjzutav@sandia.gov NR 14 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0913-6 PY 2007 BP 231 EP 235 DI 10.1109/PPPS.2007.4651828 PG 5 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300050 ER PT B AU Cich, MJ Kaplar, R Weiss, J Mar, A Saiz, T Swalby, M Zutavern, FJ Glover, SF Horry, ML Reed, KW AF Cich, M. J. Kaplar, R. Weiss, J. Mar, A. Saiz, T. Swalby, M. Zutavern, F. J. Glover, S. F. Horry, M. L. Reed, K. W. GP IEEE TI GaAs photoconductive semiconductor switch fabrication for improved reliability SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis AB The reliability of high gain GaAs photoconductive semiconductor switches (PCSS) has been investigated, with the goal of understanding how fabrication parameters impact device lifetime. We aim to produce high-voltage (50-100 kV) PCSS with improved lifetime, or equivalently, since the current in high gain PCSS flows in filaments, increase the current per filament at fixed lifetime. As a simpler model system, a large number of smaller (500 V) switches was tested. These scaled-down switches demonstrate the same failure mechanisms seen in larger switches. The distribution of switch lifetimes is shown to follow a log-normal distribution. Variations in the design and processing of larger switches were studied to ascertain the impact on device lifetime. The lifetime is strongly dependent on switch fabrication process parameters such as the anneal temperature. Design parameters such as the pad metal inset distance and thickness were not found to have the expected improvement in shot life. Evidence points to the surface preparation as a key variable in achieving high shot counts. C1 [Cich, M. J.; Kaplar, R.; Weiss, J.; Mar, A.; Saiz, T.; Swalby, M.; Zutavern, F. J.; Glover, S. F.; Horry, M. L.; Reed, K. W.] Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Cich, MJ (reprint author), Sandia Natl Labs, POB 5800,Mail Stop 1085, Albuquerque, NM 87185 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 BN 978-1-4244-0913-6 PY 2007 BP 236 EP 239 DI 10.1109/PPPS.2007.4651829 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300051 ER PT B AU Glover, SF Alexander, JA Reed, KW Pena, GE Horry, ML Usher, JM Lehr, JM AF Glover, S. F. Alexander, J. A. Reed, K. W. Pena, G. E. Horry, M. L. Usher, J. M. Lehr, J. M. GP IEEE TI Laser triggering of spark gap switches with less than 100 mu J's of energy SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis AB Concepts for future pulsed power systems include designs with high numbers of switches, and in some cases these systems will perform pulse shaping by triggering the switches sequentially in time. Drivers for isentropic compression experiments are being designed with 59 trigger points and hundreds of switches. Future generations of the Z-machine may be based on linear transformer driver technology, requiring 1/2-million triggered switches. The cost and complexity of triggering these future pulsed power systems with commercially available high voltage trigger generators continues to be prohibitive. Conventional laser triggering in these systems would entail very high initial costs, and maintenance on line-of-sight optics would significantly increase operational costs. Improvements over present day triggering technologies would include electrical isolation using small optical fibers and the ability to trigger large numbers of switches from a single laser. Results from experiments that demonstrate the triggering of a 20kV spark gap switch with less than 100 mu J of laser energy through an optical fiber are presented. C1 [Glover, S. F.; Alexander, J. A.; Reed, K. W.; Pena, G. E.; Horry, M. L.; Usher, J. M.; Lehr, J. M.] Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Glover, SF (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. EM sfglove@sandia.gov 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 BN 978-1-4244-0913-6 PY 2007 BP 240 EP 244 DI 10.1109/PPPS.2007.4651830 PG 5 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300052 ER PT B AU LeChien, K Savage, M Bliss, A Lehr, J Maenchen, J McDaniel, D Struve, K Stygar, W Van Den Avyle, J Woodworth, J Corley, J Wakeland, P Anaya, V Feltz, G Guthrie, A Hodge, K Thompson, T Wallace, Z Prestwich, K AF LeChien, K. Savage, M. Bliss, A. Lehr, J. Maenchen, J. McDaniel, D. Struve, K. Stygar, W. Van Den Avyle, J. Woodworth, J. Corley, J. Wakeland, P. Anaya, V. Feltz, G. Guthrie, A. Hodge, K. Thompson, T. Wallace, Z. Prestwich, K. GP IEEE TI Zr laser triggered gas switch requirements and performance SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis AB The Z machine at Sandia National Laboratories is presently undergoing an upgrade, called Z-Refurbishment (ZR) [1], that is aimed at improving capacity, precision, and capability to essentially all of its pulsed power components, including its thirty six laser-triggered gas switches (LTGS). Voltage and current requirements for the ZR LTGS have increased 25% from the onset of the ZR program, with no allowable increase to the physical footprint (or inductance) for the device. Initial design studies indicated that a total machine peak current of 26 MA could be achieved with the each LTGS operating at 5 MV and 600 kA. Increases in the final design inductance in the transition from vertical water transmission lines to horizontal magnetically insulated transmission lines, higher inductance in vacuum from changes in the load position for improved diagnostic access, and conservatism in the vacuum power flow requirements caused the LTGS operational goal to become 5.4 MV and 750 kA for a total machine peak current of 23 MA in 100 ns to a 10 mm radius, 10 mm long wire array. A comprehensive research program was initiated in August 2005 to improve the performance of the ZR gas switch at the 5.4 MV level, and results of that effort to date are presented herein. C1 [LeChien, K.; Savage, M.; Bliss, A.; Lehr, J.; Maenchen, J.; McDaniel, D.; Struve, K.; Stygar, W.; Van Den Avyle, J.; Woodworth, J.] Sandia Natl Labs, POB 5800,Mail Stop 1194, Albuquerque, NM 87123 USA. [Corley, J.; Wakeland, P.; Anaya, V.; Feltz, G.; Guthrie, A.; Hodge, K.; Thompson, T.; Wallace, Z.] Ktech Corp Inc, Albuquerque, NM USA. [Prestwich, K.] Kenneth R Prestwich Consulting, Albuquerque, NM USA. RP LeChien, K (reprint author), Sandia Natl Labs, POB 5800,Mail Stop 1194, Albuquerque, NM 87123 USA. EM krlechi@sandia.gov FU Sandia National Laboratories; Sandia is a multiprogram laboratory operated by Sandia Corporation; Lockheed Martin Company for the United States Department of Energy's National Nuclear Security Administration [DE-AC04-94AL85000] FX Work supported by Sandia National Laboratories. Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the United States Department of Energys National Nuclear Security Administration under contract DE-AC04-94AL85000. 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 BN 978-1-4244-0913-6 PY 2007 BP 245 EP + DI 10.1109/PPPS.2007.4651831 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300053 ER PT B AU Woodworth, JR Hahn, X Alexander, JA Denison, GJ Leckbee, JJ Glover, S Wakeland, PE Blickem, JR Starbird, R Harden, MJ Anderson, HD Gruner, FR Van DeValde, D AF Woodworth, J. R. Hahn, X. Alexander, J. A. Denison, G. J. Leckbee, J. J. Glover, S. Wakeland, P. E. Blickem, J. R. Starbird, R. Harden, M. J. Anderson, H. D. Gruner, F. R. Van DeValde, D. GP IEEE TI Gas switch studies for linear transformer drivers SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis AB We are studying several competing gas switch geometries for Linear Transformer Drivers in an attempt to design an optimum switch for these applications as well as to increase our knowledge of the physics of the switching process. In addition to standard electrical diagnostics (V, I), we are studying the switches with a variety of optical diagnostics including fast photodiodes, a framing camera and a time-resolved spectroscopy system. In our test system, 20-nF capacitors on top and bottom of the switch are charged to voltages up to +/- 100 kV. Then the switch is triggered and current flows through the switch and a load resistor in a geometry that resembles the LTD 'brick' architecture. We will present results using the multistage gas switches designed at the High Current Electronics Institute [1] and compare them to results with a low inductance switch designed at Sandia that provides a 30% higher peak current through the LTD 'brick'. C1 [Woodworth, J. R.; Hahn, X.; Alexander, J. A.; Denison, G. J.; Leckbee, J. J.; Glover, S.] Sandia Natl Labs, MS 1194,POB 5800, Albuquerque, NM 87185 USA. [Starbird, R.; Harden, M. J.; Anderson, H. D.] NS Tec, Los Alamos, NM 87544 USA. [Gruner, F. R.] Kinet LLC, Olympia, WA 98501 USA. [Van DeValde, D.] EG&G Tech Serv, Albuquerque, NM 87119 USA. RP Woodworth, JR (reprint author), Sandia Natl Labs, MS 1194,POB 5800, Albuquerque, NM 87185 USA. EM jrwoodw@sandia.gov FU Sandia is a multiprogram laboratory operated by Sandia Corporation; Lockheed Martin Company for the United States Department of National Nuclear Security Agency [DE-AC04-94AL85000] FX Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company for the United States Department of National Nuclear Security Agency under Contract DE-AC04-94AL85000. 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 BN 978-1-4244-0913-6 PY 2007 BP 250 EP + DI 10.1109/PPPS.2007.4651832 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300054 ER PT B AU Borchardt, J Alexander, J Slenes, K De La Fuente, R AF Borchardt, John Alexander, Jeff Slenes, Kirk De La Fuente, Rafael GP IEEE TI Ceramic-polymer composite for high energy density capacitors SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis AB The U.S. Department of Defense vision for future directed energy weapons systems (e.g., high power microwave systems) requires the development of electrical pulsers that exceed current state-of-the-art in energy storage density by an order of magnitude or more. Capacitors made from composite dielectric materials consisting of ceramic nanoparticles embedded in a polymer matrix show promise for attaining these goals. Sandia National Laboratories (SNL) and TPL Inc. (TPL) have teamed to investigate the limits of these new materials for use in high energy density and high power capacitor designs. The major challenges encountered thus far are quality control in the processing of the materials as well as mechanical stresses resulting from the thermal curing process while forming prototype capacitor devices. This paper reports on the current status and results achieved by this investigation. C1 [Borchardt, John; Alexander, Jeff] Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. [Slenes, Kirk; De La Fuente, Rafael] TPL Inc, Albuquerque, NM USA. RP Borchardt, J (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. EM jjborch@sandia.gov NR 1 TC 0 Z9 0 U1 0 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0913-6 PY 2007 BP 294 EP + DI 10.1109/PPPS.2007.4651842 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300064 ER PT B AU Zhao, G Joshi, RP Jalmarson, HP AF Zhao, G. Joshi, R. P. Jalmarson, H. P. GP IEEE TI Electro-thermal simulation studies for pulsed voltage failures in microstructured ZnO varistors SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis ID ZINC-OXIDE VARISTORS; GRAIN-BOUNDARIES; JUNCTIONS AB Time-dependent, two-dimensional simulations based on random Voronoi networks have been developed to study the internal heating and related breakdown effects in ZnO varistors in response to high-voltage pulsing. The focus is on internal grain-size variations and relative disorder. Our results predict that parameters such as the device hold-off voltage, the average internal temperature, and average dissipated energy density would be higher with more uniform grains. This uniformity is also predicted to produce lower thermal stresses and to allow for the application of longer duration pulses. Finally, it is shown that the principle failure mechanism arises from internal localized melting, while thermal stresses are well below the thresholds for cracking. C1 [Zhao, G.; Joshi, R. P.] Old Dominion Univ, Dept Elect & Comp Engn, Norfolk, VA 23529 USA. [Jalmarson, H. P.] Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Zhao, G (reprint author), Old Dominion Univ, Dept Elect & Comp Engn, Norfolk, VA 23529 USA. EM rjoshi@odu.edu FU Sandia National Laboratories (SNL) FX This work was sponsored in part by a grant from Sandia National Laboratories (SNL). 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 BN 978-1-4244-0913-6 PY 2007 BP 361 EP + DI 10.1109/PPPS.2007.4651859 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300081 ER PT B AU Mitton, C Corrow, G Hansen, M Henderson, D Nelson, D Ormond, E Cordova, S Molina, I Smith, J AF Mitton, C. Corrow, G. Hansen, M. Henderson, D. Nelson, D. Ormond, E. Cordova, S. Molina, I. Smith, J. GP IEEE TI Cygnus PFL switch jitter SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis AB The Cygnus Dual Beam Radiographic Facility consists of two identical radiographic sources: Cygnus I and Cygnus 2. Each source has the following X-ray output: 1-mm diameter spot size, 4 rads at 1 m, 50-ns full-width-half-maximum. The diode pulse has the following electrical specifications: 2.25 MV, 60 kA, 60 ns. This Radiographic Facility is located in an underground tunnel test area at the Nevada Test Site (NTS). The sources were developed to produce high-resolution images on subcritical tests performed at NTS. Subcritical tests are single-shot, high-value events. For this application, it is desirable to maintain a high level of reproducibility in source output. The major components of the Cygnus machines are Marx generator, water-filled pulse forming line (PFL), water-filled coaxial transmission line, three-cell inductive voltage adder, and rod-pinch diode. A primary source of fluctuation in Cygnus shot-to-shot performance may be jitter in breakdown of the main PFL switch, which is a "self-break" switch. The PFL switch breakdown time determines the peak PFL charging voltage, which ultimately affects the source X-ray spectrum and dose. Therefore, PFL switch jitter may contribute to shot-to-shot variation in these parameters, which are crucial to radiographic quality. In this paper we will present PFL switch jitter analysis for both Cygnus machines and present the correlation with dose. For this analysis, the PFL switch on each machine was maintained at a single gap setting, which has been used for the majority of shots at NTS. In addition the PFL switch performance for one larger switch gap setting will be examined. C1 [Mitton, C.; Corrow, G.; Hansen, M.; Henderson, D.] Natl Security Technol, 2621 Losse Rd, N Las Vegas, NV 89030 USA. [Nelson, D.; Ormond, E.; Cordova, S.; Molina, I.] Sandia Natl Labs, Mercury, NV 89023 USA. [Smith, J.] Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Mitton, C (reprint author), Natl Security Technol, 2621 Losse Rd, N Las Vegas, NV 89030 USA. FU National Security Technologies, LLC with the U.S. Department of Energy [DE-AC52-06NA25946] FX his work was done by National Security Technologies, LLC, under Contract No. DE-AC52-06NA25946 with the U.S. Department of Energy 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 978-1-4244-0913-6 PY 2007 BP 415 EP + DI 10.1109/PPPS.2007.4651871 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300093 ER PT B AU Wakeland, PE Corley, JP Hodge, KC Guthrie, DW Anaya, V Walla, ZR Thompson, TA Feltz, GA Maier, RA LeChien, KR Savage, ME Susan, DF Grant, RP Van den Avyle, JA AF Wakeland, P. E. Corley, J. P. Hodge, K. C. Guthrie, D. W. Anaya, V. Walla, Z. R. Thompson, T. A. Feltz, G. A. Maier, R. A. LeChien, K. R. Savage, M. E. Susan, D. F. Grant, R. P. Van den Avyle, J. A. GP IEEE TI Material testing on high voltage laser triggered gas switches for ZR SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis AB The Z machine at Sandia National Laboratories is a thirty six module pulsed power driver utilized for the study of inertial confinement fusion, isentropic compression experiments, and high density physics. Currently it is undergoing an upgrade, called Z-Refurbishment (ZR). The upgraded Z pulsed power driver requires thirty six gas switches to be capable of low jitter high voltage switching, to deliver energy to the load. The switches must remain open as voltage rises in similar to one microsecond, then close with a few nanosecond jitter upon arrival of the laser pulse. Switch performance is directly related to component materials since switches must routinely withstand a 6.25 NW, 750 kA pulsed power environment and perform reliably upon each command fire. Switch lifetime is primarily influenced by insulator flashover and electrode degradation. Early in the program the most high profile problem was random flashing of the insulator housing. Triple point shielding, cleaning procedures and an isolation window that separated the gas switch volume from the laser can volume were implemented which reduced housing flashes, to problems attributed to material debris. Electrode materials were studied in an attempt to optimize switch lifetime with respect to erosion rate, housing flashes associated with material debris and to reduce degradation of laser optics that are in close proximity to the switch. Theories on electrode ablation have contributed it to enhancing fields in the trigger section and flashing of the cascade housing. Electrode materials investigated included, tungsten-copper, stainless steel, molybdenum, tantalum and brass. SEM imaging was utilized to examine effects of arc damage for different materials. SEM imaging is also being used in attempts to understand preconditioning of electrodes and early shot switch performance. C1 [Wakeland, P. E.; Corley, J. P.; Hodge, K. C.; Guthrie, D. W.; Anaya, V.; Walla, Z. R.; Thompson, T. A.; Feltz, G. A.] Ktech Corp Inc, 10800 Gibson SE, Albuquerque, NM 87123 USA. [Maier, R. A.; LeChien, K. R.; Savage, M. E.; Susan, D. F.; Grant, R. P.] Sandia Natl Labs, Albuquerque, NM 87185 USA. [Van den Avyle, J. A.] Sandia Consultant, Corrales, NM USA. RP Wakeland, PE (reprint author), Ktech Corp Inc, 10800 Gibson SE, Albuquerque, NM 87123 USA. 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 BN 978-1-4244-0913-6 PY 2007 BP 428 EP + DI 10.1109/PPPS.2007.4651874 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300096 ER PT B AU Hjalmarson, HP Kambour, K Myles, CW Joshi, RP AF Hjalmarson, H. P. Kambour, K. Myles, C. W. Joshi, R. P. GP IEEE TI Continuum models for electrical breakdown in photoconductive semiconductor switches SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis AB In this paper, continuum models for electrical breakdown are described. These models are based on calculations of the carrier distribution function as a function of electric field and carrier density. In these continuum models, the impact ionization rate is approximated in the extremes of low and high carrier density. These continuum models are used for calculations of electrical breakdown in GaAs. In particular, these models are applied to the operation of photoconductive semiconductor switch (PCSS) devices. This comparison with data suggests that a new physics mechanism is required to explain the PCSS data, a new mechanism is hypothesized. C1 [Hjalmarson, H. P.; Kambour, K.] Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. [Myles, C. W.] Texas Tech Univ, Dept Phys, Lubbock, TX 79409 USA. [Joshi, R. P.] Old Dominion Univ, Dept Elect & Comp Engn, Norfolk, VA 23529 USA. RP Hjalmarson, HP (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. EM hphjalm@sandia.gov FU United States Department of Energy [DEAC0494AL85000] FX Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin company, for the United States Department of Energy under contract DEAC0494AL85000. 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 BN 978-1-4244-0913-6 PY 2007 BP 446 EP + DI 10.1109/PPPS.2007.4651878 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300100 ER PT B AU Johnson, JB Ekdahl, CA Broste, W Tom, CY AF Johnson, Jeffrey B. Ekdahl, Carr A. Broste, Wilfiam Tom, C. Y. GP IEEE TI B-dot detector signal recording at the DARHT II accelerator SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis AB Diagnostic detectors such as B-dot and E-dot probes have been used in pulse power and accelerator applications for decades. The DARHT H Accelerator utilizes arrays of B-dot detectors as a means to determine beam current and position. Unique problems arise when using digital recording to capture these signal waveforms. Bit error and baseline reference stability due to noise in the recording devices limits the accuracy of the recorded waveform when dealing with fast rise time signals that have relatively long pulse widths. The methods used to record the B-dot data for the 2 microsecond duration beam current at DARHT III are detailed in this paper. C1 [Johnson, Jeffrey B.; Ekdahl, Carr A.] Los Alamos Natl Lab, POB 1663,Mail Stop P942, Los Alamos, NM 87545 USA. [Broste, Wilfiam; Tom, C. Y.] Natl Security Technol, Los Alamos, NM 87544 USA. RP Johnson, JB (reprint author), Los Alamos Natl Lab, POB 1663,Mail Stop P942, Los Alamos, NM 87545 USA. FU United States Department of Energy; DOE [W-7405-ENG-36] FX Work supported by the United States Department of Energy, DOE contract number W-7405-ENG-36. 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 978-1-4244-0913-6 PY 2007 BP 490 EP + DI 10.1109/PPPS.2007.4651888 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300110 ER PT B AU Seidel, DB Savage, ME Mendel, CW AF Seidel, David B. Savage, Mark E. Mendel, Clifford W., Jr. GP IEEE TI Low impedance Z-pinch drivers without post-hole convolute current adders SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis AB Present-day pulsed-power systems operating in the terawatt regime typically use current adders to operate at sufficiently low impedance. These adders necessarily involve magnetic nulls that connect the positive and negative electrodes. The resultant loss of magnetic insulation results in electron losses in the vicinity of the nulls that can severely limit the efficiency of the delivery of the system's energy to a load. In this paper, we describe an alternate transformer-based approach to obtaining low impedance. The transformer consists of coils whose windings are in parallel rather than in series, and does not suffer from the presence of magnetic nulls. C1 [Seidel, David B.; Savage, Mark E.] Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. [Mendel, Clifford W., Jr.] Cove Consult, Belle Haven, VA 23306 USA. RP Seidel, DB (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. FU Lockheed Martin Company, for the United States Department of Energy's National Nuclear Security Administration [DE-AC04-94AL85000] FX Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the United States Department of Energys National Nuclear Security Administration under Contract DE-AC04-94AL85000. 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 BN 978-1-4244-0913-6 PY 2007 BP 519 EP + DI 10.1109/PPPS.2007.4651895 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300117 ER PT B AU Rhodes, MA Watson, J Sanders, D Sampayan, S Caporaso, G AF Rhodes, M. A. Watson, J. Sanders, D. Sampayan, S. Caporaso, G. GP IEEE TI Ferrite-free, oil-switched, four-stage high-gradient module for compact pulsed power applications SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis AB We describe the design and present initial experimental results of a novel, high-gradient, compact pulsed power module. Our application focus is linear accelerators but our technology is easily applicable to a wide range of pulse-power applications. Our design incorporates and combines for the first time a number of our recently developed, enabling technologies including: a novel, bipolar pulse-forming line allowing module stacking without ferrites, very compact and fast oil-filled switches, novel high-dielectric constant insulator/energy storage material, and a novel method for reducing edge enhancements in the pulse forming structure. The combination of these technologies enables us to design a very compact stackable module that will deliver high-gradient (5-10 W/m) voltage at 5-10 kA to arbitrary loads. Our prototype is comprised of four stages. Each stage is designed to operate at 300 kV producing 1.2-MV into 120 Ohms. The pulse length is 25-ns and the pulse-shape is rectangular. We present initial experimental results up to 75 kV per stage with the switches operating in self-break mode. C1 [Rhodes, M. A.; Watson, J.; Sanders, D.; Sampayan, S.; Caporaso, G.] Lawrence Livermore Natl Lab, Livermore, CA 94588 USA. RP Rhodes, MA (reprint author), Lawrence Livermore Natl Lab, POB 808 L-645, Livermore, CA 94588 USA. NR 5 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0913-6 PY 2007 BP 538 EP 541 DI 10.1109/PPPS.2007.4651899 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300121 ER PT B AU Weber, BV Allen, RJ Commisso, RJ Cooperstein, G Hinshelwood, DD Mosher, D Murphy, DP Ottinger, PF Phipps, DG Schumer, JW Stephanakis, SJ Swanekamp, SB Pope, S Threadgold, J Biddle, L Clough, S Jones, A Sinclair, M Swatton, D Carden, T Oliver, BV AF Weber, B. V. Allen, R. J. Commisso, R. J. Cooperstein, G. Hinshelwood, D. D. Mosher, D. Murphy, D. P. Ottinger, P. F. Phipps, D. G. Schumer, J. W. Stephanakis, S. J. Swanekamp, S. B. Pope, S. Threadgold, J. Biddle, L. Clough, S. Jones, A. Sinclair, M. Swatton, D. Carden, T. Oliver, B. V. GP IEEE TI Plasma-filled rod-pinch diode research on gamble II SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis AB The plasma-filled rod-pinch diode (PFRP) produces an intense, small x-ray source suitable for pulsed hydrodynamic radiography applications. This paper summarizes measurements of the radiographic properties of the PFRP. The small x-ray source diameter [0.4-mm full-width-at-half-maximum line-spread function] and high dose [23 rad(CaF2) at I m] with 1-2 MeV electron energies are unique capabilities that the PFRP offers for radiographic imaging in this electron-energy range. The source distribution has a narrow central peak that can enhance the spatial resolution relative to other sources with the same spot size (by standard definitions). The spectrum has enhanced emission of sub-300 keV x-rays that can improve the contrast of objects with low areal mass. C1 [Weber, B. V.; Allen, R. J.; Commisso, R. J.; Cooperstein, G.; Hinshelwood, D. D.; Mosher, D.; Murphy, D. P.; Ottinger, P. F.; Phipps, D. G.; Schumer, J. W.; Stephanakis, S. J.; Swanekamp, S. B.] USN, Res Lab, Div Plasma Phys, Washington, DC 20375 USA. [Pope, S.; Threadgold, J.; Biddle, L.; Clough, S.; Jones, A.; Sinclair, M.; Swatton, D.; Carden, T.] Atom Weap Estab, Aldermaston RG7 4PR, England. [Oliver, B. V.] Sandia Natl Labs, Albuquerque, NM USA. RP Weber, BV (reprint author), USN, Res Lab, Div Plasma Phys, Washington, DC 20375 USA. EM bruce.weber@nrl.nayy.mil FU US Office of Naval Research; Sandia National Laboratories; AWE Aldermaston FX Work supported by the US Office of Naval Research, Sandia National Laboratories and AWE Aldermaston NR 13 TC 0 Z9 0 U1 0 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0913-6 PY 2007 BP 591 EP + DI 10.1109/PPPS.2007.4651912 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300134 ER PT B AU Hinshelwood, D Allen, RJ Commisso, RJ Cooperstein, G Huhman, BM Jackson, SL Mosher, D Murphy, DP Ottinger, PF Schumer, JW Swanekamp, SB Weber, BV Young, FC Threadgold, J Oliver, BV AF Hinshelwood, David Allen, R. J. Commisso, R. J. Cooperstein, G. Huhman, B. M. Jackson, S. L. Mosher, D. Murphy, D. P. Ottinger, P. F. Schumer, J. W. Swanekamp, S. B. Weber, B. V. Young, F. C. Threadgold, J. Oliver, B., V GP IEEE TI High-power pinched-beam diode development for radiographic applications SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis ID TRANSPORT; SYSTEMS AB The negative-polarity rod-pinch diode has been studied at the 6-MV, 150-kA level on the NRL Mercury generator, in both reentrant and non-reentrant geometries. We observe good electrical coupling in reentrant geometry and satisfactory coupling in the non-reentrant case. In contrast to previous results at lower voltage, we see good electrical coupling to thin-walled aluminum anodes We see evidence that the diode geometry away from the rod tip plays a role in diode performance. Our best results to date are 75 rads at 1 meter with a 1.8-mm-diam spot. A spot size as low as 1.3 mm has been obtained, though at lower dose. The measured dose rate agrees very well with that predicted from particle-in-cell/Monte-Carlo modeling. An initial look at plasma-filled operation indicates that this technique is applicable to high-impedance diodes. C1 [Hinshelwood, David; Allen, R. J.; Commisso, R. J.; Cooperstein, G.; Huhman, B. M.; Jackson, S. L.; Murphy, D. P.; Ottinger, P. F.; Schumer, J. W.; Weber, B. V.] USN, Res Lab, Div Plasma Phys, Pulsed Power Phys Branch, Washington, DC 20375 USA. [Mosher, D.; Swanekamp, S. B.; Young, F. C.] L3 Titan, Reston, VA 20190 USA. [Threadgold, J.] AWE, Aldermaston, England. [Oliver, B., V] Sandia Natl Labs, Livermore, CA 94550 USA. RP Hinshelwood, D (reprint author), USN, Res Lab, Div Plasma Phys, Pulsed Power Phys Branch, Washington, DC 20375 USA. EM ddh@suzie.nrl.navy.mil FU US Department of Energy through Sandia National Laboratories FX Work supported by the US Department of Energy through Sandia National Laboratories NR 13 TC 0 Z9 0 U1 0 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0913-6 PY 2007 BP 603 EP + DI 10.1109/PPPS.2007.4651914 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300136 ER PT B AU Threadgold, J Martin, P Jones, A Short, D McLean, J Cooper, G Heathcote, A Hinshelwood, D Mosher, D Allen, R Cooperstein, G Portillo, S Oliver, B Rose, D Welch, D Bruner, N AF Threadgold, J. Martin, P. Jones, A. Short, D. McLean, J. Cooper, G. Heathcote, A. Hinshelwood, D. Mosher, D. Allen, R. Cooperstein, G. Portillo, S. Oliver, B. Rose, D. Welch, D. Bruner, N. GP IEEE TI Development of the self magnetic pinch diode as a high brightness radiographic source SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis AB The Self Magnetic Pinch (SMP) diode has been developed from a low voltage (<2MV) to a high voltage (7-8MV) radiographic source as part of a program to build a Hydrodynamics research facility (Hydrus) at AWE Aldermaston. Development of the initial AWE diode design has used the facilities and assistance of a number of UK and US laboratories and companies to carry out both experimental and theoretical investigations into the operation of the diode. Experimental campaigns have been carried out to both investigate the physics operation and to demonstrate performance on the RITS-3 and RITS-6 drivers at SNL, the Mercury and Gamble II drivers at NRL and the Mogul D and EROS drivers at AWE. Modelling of the diode has been carried out mainly using the Particle in Cell (PiC) code LsP. It has been demonstrated that the diode has achieved the required radiographic performance for Hydrus and it will be used as the initial operational diode when the facility is commissioned. Research to develop a long term diode with improved performance is still continuing.. C1 [Threadgold, J.; Martin, P.; Jones, A.; Short, D.; McLean, J.; Cooper, G.; Heathcote, A.] AWE Aldermaston, Reading RG7 4PR, Berks, England. [Hinshelwood, D.; Mosher, D.; Allen, R.; Cooperstein, G.] Naval Res Lab, Washington, DC 20375 USA. [Portillo, S.; Oliver, B.] Sandia Natl Labs, Albuquerque, NM 87185 USA. [Rose, D.; Welch, D.; Bruner, N.] Voss Sci, Albuquerque, NM USA. RP Threadgold, J (reprint author), AWE Aldermaston, Reading RG7 4PR, Berks, England. 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 BN 978-1-4244-0913-6 PY 2007 BP 609 EP + DI 10.1109/PPPS.2007.4651915 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300137 ER PT B AU Coverdale, CA Deeney, C Jones, B LePell, PD Velikovich, AL Thornhill, JW Davis, J Chong, YK Clark, RW Apruzese, JP Whitney, KG Chittenden, J AF Coverdale, C. A. Deeney, C. Jones, B. LePell, P. D. Velikovich, A. L. Thornhill, J. W. Davis, J. Chong, Y. K. Clark, R. W. Apruzese, J. P. Whitney, K. G. Chittenden, J. GP IEEE TI Impact of load variations on the stagnation of nested stainless steel and copper Z pinches SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis ID WIRE ARRAY IMPLOSIONS; X-RAY-EMISSION; Z-ACCELERATOR; NUMBER; TITANIUM; ALUMINUM; PLASMAS; MASS AB A variety of wire array experiments the last few years at the 20 MA Z Accelerator have been performed to assess the impact of initial load mass, initial load diameter, and variations of the nested array configuration on the K-shell output. Nominally, optimized configurations have been identified, with optimization determined by the highest K-shell output with the fastest rising, narrowest x-ray pulse. In this paper, the results of experiments performed to evaluate additional load configuration variations such as increased radial anode-cathode (RAK) gap, increases in wire number on nested arrays, and orientation of the nested arrays are presented. For stainless steel wire arrays (K-shell emission similar to 6.7 keV), increasing the wire number on the nested arrays resulted in increased K-shell yield and K-shell power. Increasing the RAK gap from 6 mm to 10 mm resulted in changes to both the soft x-ray emission and stainless steel K-shell emission. The orientation of the wires on the inner and outer arrays of copper (8.4 keV) wire arrays was not observed to impact the radiated output, although calculations suggest that the effect of wire orientation will be overwhelmed by magnetic field asymmetries induced by the wire location relative to the openings in the return current can. C1 [Coverdale, C. A.; Jones, B.] Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. [Deeney, C.] NNSA, DOE Headquarters, Washington, DC 20375 USA. [LePell, P. D.] Ktech Corp Inc, Albuquerque, NM 87123 USA. [Velikovich, A. L.; Thornhill, J. W.; Davis, J.; Chong, Y. K.; Clark, R. W.; Apruzese, J. P.] Naval Res Lab, Div Plasma Phys, Washington, DC 20375 USA. [Whitney, K. G.] Berkeley Scholars, Washington, DC 20375 USA. [Chittenden, J.] Imperial Coll, Blackett Labs, London, England. RP Coverdale, CA (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. EM cacover@sandia.gov RI Velikovich, Alexander/B-1113-2009 FU United States Department of Energy [DE-AC04-94AL85000] FX Sandia is a multi-program laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the United States Department of Energy under Contract DE-AC04-94AL85000. 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 BN 978-1-4244-0913-6 PY 2007 BP 643 EP + DI 10.1109/PPPS.2007.4651923 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300145 ER PT B AU Hahn, K Oliver, BV Johnston, MD Portillo, S Leckbee, J Rovang, DC Molina, I Cordova, S Cooper, G McLean, J Welch, DR Bruner, N Rose, DV AF Hahn, K. Oliver, B. V. Johnston, M. D. Portillo, S. Leckbee, J. Rovang, D. C. Molina, I. Cordova, S. Cooper, G. McLean, J. Welch, D. R. Bruner, N. Rose, D. V. GP IEEE TI Radiographic paraxial diode investigations on RITS-6 SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis ID GAS AB Presently, investigations of intense electron beam-driven diodes for flash x-ray radiography are being conducted on the upgraded RITS-6 accelerator, 7-12 MV, at Sandia National Laboratories. One of several diodes under investigation is the paraxial diode, which employs a gas-filled transport cell to focus the beam onto a high atomic number target to generate x-rays. Two key objectives are to produce a small spot size, < 5 mm, and high forward directed dose, similar to 600- 1000+ Rads @ 1 m. LSP simulations have shown that the primary limitation in spot size is due to the finite decay of the plasma return current which causes the beam focal location to drift axially during the timescale of the pulse, hence leading to an increased spot size [1]. Replacing the gas with a preionized plasma has shown potential for stabilizing the beam focus by completely neutralizing the beam current [2]. Plans for the incorporation of a novel plasma-filled version of the gas-filled paraxial are presented. Another outstanding issue for the paraxial diode on RITS-6 concerns the powerflow coupling from the magnetically insulated transmission line to the diode. The radiation pulse is dominated by large amplitude oscillations, similar to 125 MHz, which are correlated with the drive pulse. LSP simulations have shown that higher frequency modes, similar to 220-365 MHz, are excited in the diode region as well. Efforts to mitigate these oscillations are presented. Forward-directed dose as well as time-integrated and time-resolved radiation spot measurements are reported. C1 [Hahn, K.; Oliver, B. V.; Johnston, M. D.; Portillo, S.; Leckbee, J.; Rovang, D. C.; Molina, I.; Cordova, S.] Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. [Cooper, G.; McLean, J.] Atomic Weap Etab, Berkshire RG7 4PR, England. [Welch, D. R.; Bruner, N.; Rose, D. V.] Voss Sci, Albuquerque, NM 87108 USA. RP Hahn, K (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. EM kdhahn@sandia.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 BN 978-1-4244-0913-6 PY 2007 BP 794 EP + DI 10.1109/PPPS.2007.4651959 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300181 ER PT B AU Rovang, DC Johnston, MD Maenchen, JE Oliver, BV Portillo, S Puetz, E Bruner, N Rose, DV Welch, DR Coope, GM McLean, J AF Rovang, D. C. Johnston, M. D. Maenchen, J. E. Oliver, B. V. Portillo, S. Puetz, E. Bruner, N. Rose, D. V. Welch, D. R. Coope, G. M. McLean, J. GP IEEE TI Immersed-B-z diode research on RITS at Sandia SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis AB Sandia National Laboratories is investigating and developing high-dose, high-brightness flash radiographic sources. One of the diodes we are developing is the immersed-B-z diode. This diode is a foil-less electron-beam diode with a long, thin, needle-like cathode inserted into the bore of a solenoid. The solenoidal magnetic field guides the electron beam emitted from the cathode to the anode while maintaining a small beam radius. The electron beam strikes a thin, high-atomic-number anode and produces bremsstrahlung. Recently, we reported on an extensive series of experiments' where an immersed-B-z. 23 diode was fielded on the RITS-3(2,3) pulsed power accelerator, a 3-cell inductive voltage generator that produced peak voltages between 4 and 5 MV, similar to 140 kA of total current, and power pulse widths of similar to 50 ns. The analysis of those results is on-going. A summary of those results and analyses are presented. C1 [Rovang, D. C.; Johnston, M. D.; Maenchen, J. E.; Oliver, B. V.; Portillo, S.; Puetz, E.] Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. [Bruner, N.; Rose, D. V.; Welch, D. R.] Voss Sci, Albuquerque, NM 87108 USA. [Coope, G. M.; McLean, J.] Atom Weap Estab, Berkshire RG7 4PR, England. RP Rovang, DC (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 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 BN 978-1-4244-0913-6 PY 2007 BP 798 EP + DI 10.1109/PPPS.2007.4651960 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300182 ER PT B AU Bruner, N Mostrom, C Rose, DV Welch, DR Bailey, V Johnson, AL Oliver, BV AF Bruner, N. Mostrom, C. Rose, D. V. Welch, D. R. Bailey, V. Johnson, A. L. Oliver, B. V. GP IEEE TI Modeling the RITS-6 transmission line SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis ID DIODE AB Sandia National Laboratories' Radiographic Integrated Test Stand (RITS-6) is a six-cell inductive voltage adder accelerator designed to produce currents of 186 kA at 7.8 MV in 70 ns in its low-impedance configuration. The six inductive-adder cells are connected in series to a coaxial magnetically insulated transmission line. Each cell has a single point feed to an azimuthal transmission line which distributes the pulse around the cell bore. To understand the extent to which power is distributed symmetrically around the coaxial transmission line and its effect on electron power flow downstream, particle-in-cell simulations were used to model the entire RITS-6 transmission line in 3D from pulse forming circuit to the diode load. Simulation results show electron flow current to be asymmetric by 16% at the exit to the sixth cell, but 3% or less at diagnostic positions near the load. Magnetic insulation in the trans-mission line does not appear to be impacted by the asymmetry, though flow impedance is not uniform axially. C1 [Bruner, N.; Mostrom, C.; Rose, D. V.; Welch, D. R.] Voss Sci LLC, 418 Washington St SE, Albuquerque, NM USA. [Bailey, V.; Johnson, A. L.] L 3 Commun Pulse Sci Div, San Leandro, CA USA. [Oliver, B. V.] Sandia Natl Labs, Albuquerques, NM 81185 USA. RP Bruner, N (reprint author), Voss Sci LLC, 418 Washington St SE, Albuquerque, NM USA. EM nlbrune@sandia.gov FU [502299]; [DEAC52-06NA-25129/PALD783]; [DE-AC04-02AL-67817/PALD760]; [DE-AC04-94AL85000] FX Work performed for Sandia National Laboratories under contract 502299 in accordance with U.S./U.K. contracts DEAC52-06NA-25129/PALD783 and DE-AC04-02AL-67817/PALD760.; Sandia is a multi-program laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the United States Department of Energys National Nuclear Security Administration under contract DE-AC04-94AL85000. NR 10 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0913-6 PY 2007 BP 807 EP + DI 10.1109/PPPS.2007.4651962 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300184 ER PT B AU Jackson, SL Hinshelwood, DD Weber, BV Critchley, A McBarron, W Martin, P Threadgold, J Oliver, BV AF Jackson, S. L. Hinshelwood, D. D. Weber, B. V. Critchley, A. McBarron, W. Martin, P. Threadgold, J. Oliver, B. V. GP IEEE TI Electron density measurements on radiographic diodes SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis ID INTERFEROMETER AB A Mach-Zehnder interferometer was applied to radiographic diode studies conducted on the high-impedance Mercury pulsed-power generator. The interferometer was fielded in both quadrature and high-sensitivity arrangements to measure the density of the expanding electrode plasmas in a self-magnetic pinch diode. A phase shift corresponding to an electron density on the order of 10(15) cm(-3) was observed at several locations across the gap during the x-ray pulse, rising to a value of 5x10(15) cm(-3) at the time of impedance collapse. Measurements were also made of a plasma pre-fill with a chord-integrated density of 10(14) cm(-2) that was injected prior to several of the pulses and affected the diode impedance. The reported work represents significant progress in the effort to overcome the challenges associated with measuring the electron density of radiographic diodes. C1 [Jackson, S. L.; Hinshelwood, D. D.; Weber, B. V.] USN, Div Plasma Phys, Res Lab, Code 6770,4555 Overlook Ave, Washington, DC 20375 USA. [Critchley, A.; McBarron, W.; Martin, P.; Threadgold, J.] A WE Aldermaston, Berkshire RG7 4PR, England. [Oliver, B. V.] Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Jackson, SL (reprint author), USN, Div Plasma Phys, Res Lab, Code 6770,4555 Overlook Ave, Washington, DC 20375 USA. EM Stuart.Jackson@nrl.navy.mil FU US Department of Energy, through Sandia National Laboratories; UK Atomic Weapons Establishment (AWE) FX Work supported in part by the US Department of Energy, through Sandia National Laboratories, and by the UK Atomic Weapons Establishment (AWE). The authors are indebted to members of the NRL Pulsed Power Physics Branch for their assistance in operating the Mercury pulsed power generator, and in particular would like to acknowledge the expert technical assistance of A. Miller of L3 Communications. This work was supported in part by the US Department of Energy, through Sandia National Laboratories, and by the UK Atomic Weapons Establishment. NR 9 TC 0 Z9 0 U1 0 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0913-6 PY 2007 BP 815 EP + DI 10.1109/PPPS.2007.4651964 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300186 ER PT B AU Dale, GE AF Dale, G. E. GP IEEE TI Pulsed modulator for an IEC neutron source SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis AB This paper discusses the design and construction of a 1/10(th) scaled prototype pulse modulator for an IEC neutron source. The scaled prototype modulator has an output voltage of 13 kV and an output current of 10A. A significant feature of the modulator is that it has a variable pulse width (50 mu s - 1ms) with < 5% droop at all pulse widths. The modulator operates with a duty factor up to 5% and has a maximum pulse repetition frequency of 1 kHz. Preliminary test results are given. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Dale, GE (reprint author), Los Alamos Natl Lab, POB 1663,Mailstop H851, Los Alamos, NM 87545 USA. RI Dale, Gregory/A-9419-2009 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 BN 978-1-4244-0913-6 PY 2007 BP 869 EP 873 DI 10.1109/PPPS.2007.4651977 PG 5 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300199 ER PT B AU Rousculp, CL Hammerberg, JE Oro, DM Rodriguez, G Goodwin, PM Salazar, MA Reinovsky, RE Faehl, RJ Chartrand, R Becker, JR Berglin, RA Delzer, KW Gomez, GH Malone, RM Morgan, DV Pate, TV Theuer, KE Rigney, DA Kim, HJ AF Rousculp, C. L. Hammerberg, J. E. Oro, D. M. Rodriguez, G. Goodwin, P. M. Salazar, M. A. Reinovsky, R. E. Faehl, R. J. Chartrand, R. Becker, J. R. Berglin, R. A. Delzer, K. W. Gomez, G. H. Malone, R. M. Morgan, D. V. Pate, T. V. Theuer, K. E. Rigney, D. A. Kim, H. J. GP IEEE TI Dynamic friction experiments at the atlas pulsed power facility SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis AB A Series of dynamic friction experiments has been conducted at the Atlas Pulsed Power Facility. Pulsed currents in excess of 21 MAmps were delivered to a cylindrical liner in about 15 ms. The liner was accelerated to km/s velocities and symmetrically impacted a hollow Ta/Al/Ta target. Due to the shock speed difference in Ta and Al, sliding velocities of almost a km/s were achieved at the Ta/Al interfaces. Initial analysis indicates that the machine performed to within a few percent of the design specifications. The primary diagnostic for these experiments was three radiographic lines-of-sight to look at thin gold wires embedded within the Al piece of the target. The magnitude of the displacement and the amount of distortion of the wires near the material interface is used as a measure of the dynamic frictional forces occurring there. Other diagnostics included a single-point VISAR and line-ORVIS to measure the breakout time and velocity on the inside of the target. Also, the Faraday rotation of a laser beam through a circular loop of optical fiber located in the power-flow channel of the experiment is used to measure the total current delivered to the experimental load. Data are being compared to a theoretical dynamic friction model for high sliding velocities. The model is based on molecular dynamics simulations and predicts an inverse power law dependence of frictional forces at very high sliding. C1 [Rousculp, C. L.; Hammerberg, J. E.; Oro, D. M.; Rodriguez, G.; Goodwin, P. M.; Salazar, M. A.; Reinovsky, R. E.; Faehl, R. J.; Chartrand, R.] Los Alamos Natl Lab, Los Alamos, NM 87544 USA. [Becker, J. R.; Berglin, R. A.; Delzer, K. W.; Gomez, G. H.; Malone, R. M.; Morgan, D. V.; Pate, T. V.; Theuer, K. E.] NSTec, Livermore, CA USA. [Rigney, D. A.; Kim, H. J.] Ohio State Univ, Columbus, OH 43210 USA. RP Rousculp, CL (reprint author), Los Alamos Natl Lab, Los Alamos, NM 87544 USA. RI Rodriguez, George/G-7571-2012 OI Rodriguez, George/0000-0002-6044-9462 FU U.S. Department of Energy [DE-AC52-06NA25396] FX This work supported by the U.S. Department of Energy under contract DE-AC52-06NA25396 NR 6 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0913-6 PY 2007 BP 881 EP + DI 10.1109/PPPS.2007.4651980 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300202 ER PT B AU Reinovsky, RE Atchison, WL Dimonte, G Kaul, AM Rodriguez, G Rousculp, CL Reardon, PT AF Reinovsky, R. E. Atchison, W. L. Dimonte, G. Kaul, A. M. Rodriguez, G. Rousculp, C. L. Reardon, P. T. GP IEEE TI Pulsed power hydrodynamics: Atlas results and future perspectives SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis AB Pulsed Power Hydrodynamics (PPH) is a new application of low-impedance, pulsed power technology to the study of complex hydrodynamics, instabilities, turbulence, and material properties in a highly precise, controllable environment at the extremes of pressure and material velocity. The Atlas facility, designed and built by Los Alamos, is the world's first, and only, laboratory pulsed power system designed specifically to explore this relatively new family of pulsed power applications. Constructed in the year 2000 and commissioned in August 2001, Atlas is a 24-MJ high-performance capacitor bank delivering currents up to 30-Megamperes with a rise time of 5 to 6-mu sec. The high-precision, cylindrically imploding liner is the tool most frequently used to convert electromagnetic energy into the hydrodynamic (particle kinetic) energy needed to drive strong shocks, quasi-isentropic compression, or large volume, adiabatic compression for the experiments. At typical parameters, a 30-gr, 1-mm-thick liner with an initial radius of 5-cm, and an intermediate current of 20-MA can be accelerated to 7.5-km/sec producing megabar shocks in medium density targets. Velocities up to 20-km/sec and pressures > 20-Mbar in high density targets are possible. C1 [Reinovsky, R. E.; Atchison, W. L.; Dimonte, G.; Kaul, A. M.; Rodriguez, G.; Rousculp, C. L.; Reardon, P. T.] Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Reinovsky, RE (reprint author), Los Alamos Natl Lab, POB 1663,MS D420, Los Alamos, NM 87545 USA. RI Rodriguez, George/G-7571-2012 OI Rodriguez, George/0000-0002-6044-9462 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 BN 978-1-4244-0913-6 PY 2007 BP 930 EP 936 DI 10.1109/PPPS.2007.4652344 PG 7 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300212 ER PT B AU Spielman, RB Chantrenne, S McDaniel, DH AF Spielman, R. B. Chantrenne, S. McDaniel, D. H. GP IEEE TI Energy losses in high current density conductors SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis AB The Z accelerator at Sandia National Laboratories has reached currents in excess of 20 MA; and the new ZR accelerator, scheduled to come on line later in 2007, will generate currents greater than 26 MA. These very high currents are delivered to loads with characteristic dimensions of similar to 1 cm or less. The resulting linear current densities can exceed 5 MA/cm. At these current densities there can be significant losses in conductors. Original studies by Singer [5] and later work by Spielman et al. [7] started to provide predictions of these conductor losses. Improved materials properties (equations-of-state and resistivities) have found their way into magneto-hydrodynamic computer codes thereby providing significant improvements in predictive capabilities. We find that the key loss mechanisms are shock heating, pdV compressive heating, ohmic heating, and dynamic material motion. In addition to the dissipative losses described above, diffusion of current into conductors and material motion acts to increase the inductance of the conductors. We describe calculations of conductor losses in stainless steel and tungsten. We show that losses generally increase with lower density material and strongly increase with current density and current pulse duration. For 100-ns rise-time current pulses at current densities of 10 MA/cm, energy losses in a stainless steel coaxial conductor can be similar to 8%/cm. C1 [Spielman, R. B.; Chantrenne, S.] Ktech Corp Inc, Albuquerque, NM 87123 USA. [McDaniel, D. H.] Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Spielman, RB (reprint author), Ktech Corp Inc, Albuquerque, NM 87123 USA. FU Ktech Corporation; Sandia National Laboratories; NNSA [DE-ACO4-94AL85000] FX This work supported by Ktech Corporation and by Sandia National Laboratories. Sandia is a multi-program laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the United States DOE and NNSA under Contract DE-ACO4-94AL85000. 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 BN 978-1-4244-0913-6 PY 2007 BP 937 EP + DI 10.1109/PPPS.2007.4652345 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300213 ER PT B AU Watt, RG Idzorek, G Kanzleiter, R Peterson, DL Peterson, RR Tierney, H Tierney, T Jones, MR Lopez, M AF Watt, R. G. Idzorek, G. Kanzleiter, R. Peterson, D. L. Peterson, R. R. Tierney, H. Tierney, T. Jones, M. R. Lopez, M. GP IEEE TI Blast wave measurements of ICF hohlraum energy loss at Z SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis AB Inertial confinement fusion at the National Ignition Facility (NIF) is a grand challenge embraced by the nation. The designs of fusion ignition targets are based primarily on the indirect drive concept in which 351 nm laser light is absorbed by the wall of a cylindrical hohlraum, typically made of Au in current experiments. The hohlraum is an energy trapping container designed to retain as much of the incident energy as possible for use inside the walls of the hohlraum. The resulting hot wall material re-radiates a large fraction of the absorbed energy in the form of an x-ray bath at a few 100 eV, which irradiates, ablates, and implodes a DT filled capsule in which fusion occurs. The efficiency with which this can be done will depend on the atomic physics of the laser-wall interaction combined with Marshak wave energy losses into the wall, laser energy reflected back out of the hohlraum due to induced laser-plasma instabilities, and x-ray energy lost out of laser entrance holes, diagnostic holes and other imperfections in the wall. Energy loss from the hohlraum may be estimated based on the area of the missing wall or simulated by 2D radiation-hydrodynamics codes such as LASNEX[1]. Ibis experiment was an attempt to verify that the simulations done with LASNEX are accurately capturing the x-ray energy loss out of holes and other openings in the wall of a hohlraum. C1 [Watt, R. G.; Idzorek, G.; Kanzleiter, R.; Peterson, D. L.; Peterson, R. R.; Tierney, H.; Tierney, T.] Los Alamos Natl Lab, POB 1663,Mail Stop D-410, Los Alamos, NM USA. [Jones, M. R.; Lopez, M.] Sandia Natl Labs, Albuquerque, NM USA. RP Watt, RG (reprint author), Los Alamos Natl Lab, POB 1663,Mail Stop D-410, Los Alamos, NM USA. EM watt_r@lanl.gov FU U.S. Dept of Energy [DE-AC52-06NA25396] FX Work supported by the U.S. Dept of Energy under contract number DE-AC52-06NA25396 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 BN 978-1-4244-0913-6 PY 2007 BP 942 EP + DI 10.1109/PPPS.2007.4652346 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300214 ER PT B AU Welch, DR Rose, DV Bruner, N Portillo, S Oliver, BV AF Welch, D. R. Rose, D. V. Bruner, N. Portillo, S. Oliver, B. V. GP IEEE TI The role of plasma evolution in the operation of a self magnetically pinched diode SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis AB The self-magnetic pinch diode is being developed as an intense electron beam source for high-power x-ray radiography. The diode is comprised of a similar to 1-cm diameter, hollow cathode with a rounded tip from which a high-current electron beam is emitted. The beam self focuses in its own magnetic field as it propagates across a similar to 1-cm vacuum gap where it deposits its energy onto a planar high-atomic-number bremsstrahlung target. Heating of the anode by the beam quickly provides an ion emitting plasma and bipolar diode operation. The dynamics of expanding electrode plasmas can affect the impedance lifetime of the diode. Realistic modeling of such plasmas is being pursued to aid in the understanding of the operating characteristics of these diodes as well as establishing scaling relations for reliable extrapolation to higher voltages. Here, a hybrid particle-in-cell code is used to study the evolution of electrode plasmas in the self-magnetic pinch diode for a nominal 6-MV voltage and different anode-cathode gaps. The impact of the intense ion beam on the cathode surface can lead to enhancement of the cathode plasma production and faster diode impedance loss. C1 [Welch, D. R.; Rose, D. V.; Bruner, N.] LLC, Voss Sci, 418 Washington St, Albuquerque, NM 87108 USA. [Oliver, B. V.] Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Welch, DR (reprint author), LLC, Voss Sci, 418 Washington St, Albuquerque, NM 87108 USA. EM dale.welch@vosssci.com FU Sandia National Laboratories; Atomic Weapons Establishment [PALD 760]; United States Department of Energy's National Nuclear Security Administration [DE-AC04-94-AL85000] FX This work was support by Sandia National Laboratories and the Atomic Weapons Establishment under PALD 760. 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-AC04-94-AL85000. 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 BN 978-1-4244-0913-6 PY 2007 BP 966 EP + DI 10.1109/PPPS.2007.4652351 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300219 ER PT B AU Weinbrecht, EA Bloomquist, DD McDaniel, DH Mckee, GR Donovan, GL Weed, JW Faturos, TV Tabor, DA Moncayo, C AF Weinbrecht, E. A. Bloomquist, D. D. McDaniel, D. H. Mckee, G. R. Donovan, G. L. Weed, J. W. Faturos, T. V. Tabor, D. A. Moncayo, C. GP IEEE TI Update of the Z refurbishment project (ZR) at sandia national laboratories SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis AB Sandia's Z Refurbishment (ZR) Project formally began in February 2002 to increase the Z Accelerator's utilization by providing the capability to perform more shots, improve precision and pulse shape variability, and increase delivered current. A project update was provided at the 15th International Pulsed Power Conference in 2005 [1]. The Z facility was shut down in July 2006 for structural/infrastructure modifications and installation of new pulsed power systems. The refurbishment will conclude in 2007. This paper provides a status update of the project covering the past 2 years of activities. C1 [Weinbrecht, E. A.; Bloomquist, D. D.; McDaniel, D. H.; Mckee, G. R.; Donovan, G. L.; Weed, J. W.; Faturos, T. V.; Tabor, D. A.; Moncayo, C.] Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Weinbrecht, EA (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. 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 BN 978-1-4244-0913-6 PY 2007 BP 975 EP 978 DI 10.1109/PPPS.2007.4652353 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300221 ER PT B AU Savage, ME Bennett, LF Bliss, DE Clark, WT Coats, RS Elizondo, JM LeChien, KR Harjes, HC Lehr, JM Maenchen, JE McDaniel, DH Pasik, MF Pointon, TD Owen, AC Seidel, DB Smith, DL Stoltzfus, BS Struve, KW Stygar, WA Warne, LK Woodworth, JR Mendel, CW Prestwich, KR Shoup, RW Johnson, DL Corley, JP Hodge, KC Wagoner, TC Wakeland, PE AF Savage, M. E. Bennett, L. F. Bliss, D. E. Clark, W. T. Coats, R. S. Elizondo, J. M. LeChien, K. R. Harjes, H. C. Lehr, J. M. Maenchen, J. E. McDaniel, D. H. Pasik, M. F. Pointon, T. D. Owen, A. C. Seidel, D. B. Smith, D. L. Stoltzfus, B. S. Struve, K. W. Stygar, W. A. Warne, L. K. Woodworth, J. R. Mendel, C. W. Prestwich, K. R. Shoup, R. W. Johnson, D. L. Corley, J. P. Hodge, K. C. Wagoner, T. C. Wakeland, P. E. GP IEEE TI An overview of pulse compression and power flow in the upgraded Z pulsed power driver SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis AB The Z pulsed power driver [1] at Sandia National Laboratories is used to develop high energy density z-pinch x-ray sources for inertial confinement fusion research and radiation effects testing, and to drive megabar pressures in material samples for equation of state studies. The entire pulsed power system is in the process of being replaced, improving reliability and increasing the energy delivered to the load. The upgraded pulsed power system ultimately will deliver more than nine megajoules of forward going wave energy in the first one hundred nanoseconds of its pulse. The system is comprised of thirty-six nominally identical modules, each producing a 3.3-terawatt pulse in 6 Omega water-insulated transmission lines. The peak forward-going voltage is about 5 MV. The pulse rise time is similar to 75 ns; the full width at half maximum is similar to 190 us. The thirty-six modules are combined in parallel and drive twenty to twenty-five MA into the single load. Figure 1 shows a cross section of the upgraded Z driver. The outer tank diameter is thirty-three meters. C1 [Savage, M. E.; Bennett, L. F.; Bliss, D. E.; Clark, W. T.; Coats, R. S.; Elizondo, J. M.; LeChien, K. R.; Harjes, H. C.; Lehr, J. M.; Maenchen, J. E.; McDaniel, D. H.; Pasik, M. F.; Pointon, T. D.; Owen, A. C.; Seidel, D. B.; Smith, D. L.; Stoltzfus, B. S.; Struve, K. W.; Stygar, W. A.; Warne, L. K.; Woodworth, J. R.] Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. [Mendel, C. W.; Prestwich, K. R.] Consult, Albuquerque, NM 87110 USA. [Shoup, R. W.] ITT Corp, Adv Engn & Sci, Albuquerque, NM 87110 USA. [Johnson, D. L.] L 3 Pulse Sci, San Leandro, CA 94577 USA. [Corley, J. P.; Hodge, K. C.; Wagoner, T. C.; Wakeland, P. E.] Ktech Corp Inc, Albuquerque, NM 87106 USA. RP Savage, ME (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. FU United States Department of Energy's National Nuclear Security Administration [DE-AC04-94AL85000] FX 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 23 TC 1 Z9 2 U1 0 U2 6 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0913-6 PY 2007 BP 979 EP + DI 10.1109/PPPS.2007.4652354 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300222 ER PT B AU Struve, KW Harjes, HC Corley, JP AF Struve, K. W. Harjes, H. C. Corley, J. P. GP IEEE TI Circuit model predictions for the performance of ZR SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis AB With the completion of the ZR upgrade of the Z accelerator at the Sandia National Laboratories in the summer of 2007, pulsed-power checkout and initial wire-array experiments will begin. The first experiments will be done at reduced machine voltage to allow characterization of the machine, and debugging of components and diagnostics. Predictions for the performance of the machine with various loads and pulsed-power configurations have been made based on measurements made on the Z20 single-module test facility. The pulsed-power drive from the single-module experiments has been well characterized. However performance of the full system is less certain because it is based on calculated impedances and predicted losses, rather than measurements that are not possible before assembly of the full machine. With these caveats in mind we predict load currents and rise-times for the full machine for both short-pulse and long-pulse wire-array and isentropic compression experiment (ICE) load configurations. These predictions will be given for both the low-voltage startup conditions, and full-voltage operation. Also presented will be equivalent circuit models for ZR that can be imported into other design codes. All predictions are done with Screamer and Bertha circuit-code models. C1 [Struve, K. W.; Harjes, H. C.; Corley, J. P.] Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. [Corley, J. P.] Ktech Corp Inc, Albuquerque, NM 87185 USA. RP Struve, KW (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. EM kwstruv@sandia.gov FU United States Department of Energy [DE-AC04-94AL85000] FX Sandia is a multi-program laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the United States Department of Energy under Contract DE-AC04-94AL85000. NR 16 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0913-6 PY 2007 BP 985 EP + DI 10.1109/PPPS.2007.4652355 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300223 ER PT B AU Langston, WL Pointon, TD AF Langston, W. L. Pointon, T. D. GP IEEE TI Reduction of electron flow current and localized anode energy deposition in transitions from coaxial feeds to a disk SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis AB Many conceptual designs for fusion energy involve combining energy from a number of feed lines to a centrally located load. One such design with 70 coaxial lines (each delivering I(a) similar to 1 MA at V similar to 7 MV) merging into a center disk has been shown to yield large (I(e) similar to 10-40 MA) electron flow currents. The combination of large electron flow currents, abrupt transitions, and magnetic nulls (inherent in this type of current-adder geometry) cause an extreme amount of energy to be deposited into localized areas of the anode. A revised design is proposed using 10 coaxial lines delivering I(a) similar to 7 MA at V similar to 9 MV to provide improved magnetic insulation, hence lowering the electron flow currents. Unfortunately, it is shown that reducing the electron flow currents only provides part of the solution to the problem of localized anode energy deposition. Additional modifications to the geometry of the coaxial-to-disk transitions are also necessary to obtain results where reasonable anode temperatures are maintained. Computer simulations are used to examine these designs. The 3-D electromagnetic, particle-in-cell (PIC) code QUICKSILVER developed at Sandia National Laboratories is used for the numerical simulations. C1 [Langston, W. L.; Pointon, T. D.] Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Langston, WL (reprint author), Sandia Natl Labs, POB 5800,Mail Stop 1152, Albuquerque, NM 87185 USA. EM wllangs@sandia.gov; tdpoint@sandia.gov 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 BN 978-1-4244-0913-6 PY 2007 BP 990 EP 994 DI 10.1109/PPPS.2007.4652356 PG 5 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300224 ER PT B AU Mar, A Serkland, DK Keeler, GA Roose, LD Geib, KM Loubriel, GM Zutavern, FJ AF Mar, Alan Serkland, D. K. Keeler, G. A. Roose, L. D. Geib, K. M. Loubriel, G. M. Zutavern, F. J. GP IEEE TI Multi-filament triggering of PCSS for high current utilizing VCSEL triggers SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis AB We are developing advanced optically-activated solid-state switch technology for Firing Sets. Advanced switch development at Sandia has demonstrated multi-kA/kV switching and the path for scalability to even higher current/power, resulting in good prospects for sprytron replacement and other even higher current pulsed power switching applications. Realization of this potential requires development of new optical sources/switches based on key Sandia photonic device technologies: vertical-cavity surface-emitting lasers (VCSELs) and photoconductive semiconductor switch (PCSS) devices. The key to increasing the switching capacity of PCSS devices to 5kV/5kA and higher has been to distribute the current in multiple parallel line filaments triggered by an array of high-brightness line-shaped illuminators.' This was limited by commercial mechanically-stacked edge-emitting lasers, which are difficult to scale and manufacture with the required uniformity. In VCSEL arrays, adjacent lasers utilize identical semiconductor material and are lithographically patterned to the required aspect ratio. However, we have demonstrated that good optical uniformity in rectangular-aperture (e.g. 5-by500 mu m) VCSELs is difficult to achieve due to the lack of optical confinement in the long dimension. We have demonstrated line filament triggering using 1-D VCSEL arrays to approximate line generation. These arrays of uncoupled circular-aperture VCSELs have fill factors ranging from 2% to 40%. Using these arrays, we are developing a better understanding of the illumination requirements for stable triggering of multiple-filament PCSS devices. In particular, we are examining the dependence of filament formation versus the illumination fill factor and spatial brightness along the length of the filament. Ultimately, we will apply effective index techniques, pioneered at Sandia for leaky-mode VCSELs, to create a lateral photonic lattice that selects a single transverse mode with high brightness and uniformity for even higher fill factors and illumination unformity.(2) These sources will be developed and tested with complementary PCSS designs employing interdigitated multi-filament contacts for high-power switching. C1 [Mar, Alan; Serkland, D. K.; Keeler, G. A.; Roose, L. D.; Geib, K. M.; Loubriel, G. M.; Zutavern, F. J.] Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Mar, A (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. 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 BN 978-1-4244-0913-6 PY 2007 BP 1000 EP 1003 DI 10.1109/PPPS.2007.4652358 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300226 ER PT B AU Sullivan, JS Stanley, JR AF Sullivan, J. S. Stanley, J. R. GP IEEE TI Wide bandgap extrinsic photoconductive switches SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis AB Semi-insulating Silicon Carbide and Gallium Nitride are attractive materials for compact, high voltage, photoconducting semiconductor switches (PCSS) due to their large bandgap (3.0 - 3.4 eV), high critical electric field strength (3.0 - 3.5 MV/cm) and high electron saturation velocity (2.0 - 2.5x10(7) cm/s). Carriers must be optically generated throughout the volume of the photoswitch to realize the benefits of the high bulk electric field strength of the 611-SiC (3 MV/cm) and GaN (3.5 W/Cm) materials. This is accomplished by optically exciting deep extrinsic levels in Vanadium compensated semi-insulating 611-SiC and Iron compensated semi-insulating GaN. Photoconducting switches with opposing electrodes were fabricated on a-plane, 6H-SiC substrates and c-plane, GaN substrates. This work reports the initial fabrication and test of extrinsic GaN switches excited at a wavelength of 532 mn, and a review of the first phase [1] of switch tests of a-plane, 6H-SiC PCSS. C1 [Sullivan, J. S.; Stanley, J. R.] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Sullivan, JS (reprint author), Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. NR 7 TC 0 Z9 0 U1 0 U2 3 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0913-6 PY 2007 BP 1040 EP 1043 DI 10.1109/PPPS.2007.4652367 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300235 ER PT B AU Ong, MM Kihara, R Zentler, JM Kreitzer, BR DeHope, WJ AF Ong, Mike M. Kihara, Ron Zentler, Jan M. Kreitzer, Blake R. DeHope, William J. GP IEEE TI Estimating the reliability of Lawrence Livermore National Laboratory (LLNL) flash X-ray (FXR) machine SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis AB At Lawrence Livermore National Laboratory (LLNL), our flash X-ray accelerator (FXR) is used on multi-million dollar hydrodynamic experiments. Because of the importance of the radiographs, FXR must be ultra-reliable. Flash linear accelerators that can generate a 3 kA beam at 18 MeV are very complex. They have thousands, if not millions, of critical components that could prevent the machine from performing correctly. For the last five years, we have quantified and are tracking component failures. From this data, we have determined that the reliability of the high-voltage gas-switches that initiate the pulses, which drive the accelerator cells, dominates the statistics. The failure mode is a single-switch pre-fire that reduces the energy of the beam and degrades the X-ray spot-size. The unfortunate result is a lower resolution radiograph. FXR is a production machine that allows only a modest number of pulses for testing. Therefore, reliability switch testing that requires thousands of shots is performed on our test stand. Study of representative switches has produced pre-fire statistical information and probability distribution curves. This information is applied to FXR to develop test procedures and determine individual switch reliability using a minimal number of accelerator pulses. C1 [Ong, Mike M.; Kihara, Ron; Zentler, Jan M.; Kreitzer, Blake R.; DeHope, William J.] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Ong, MM (reprint author), Lawrence Livermore Natl Lab, POB 808,Mail Stop L-153, Livermore, CA 94550 USA. NR 3 TC 0 Z9 0 U1 0 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0913-6 PY 2007 BP 1078 EP 1081 DI 10.1109/PPPS.2007.4652375 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300243 ER PT B AU Nielsen, K Barraza, J Kang, M Prichard, B AF Nielsen, K. Barraza, J. Kang, M. Prichard, B. GP IEEE TI Performance of the DARHT second axis induction cells SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis AB The Dual-Axis Radiographic Hydrodynamics Test (DARHT) facility will employ two perpendicular electron Linear Induction Accelerators to produce intense, bremsstrahlung x-ray pulses for flash radiography. The second axis, DARHT II [1], features a 2.5-MeV injector and a 15.5-MeV, 2-kA, 1.6-microsecond accelerator consisting of 74 induction cells and drivers. Major induction cell components include high flux swing magnetic material (Metglas 2605SC) and a Mycalex (TM) insulator. The cell drivers are pulse forming networks (PFNs). The DARHT 11 accelerator cells have undergone a series of test and modeling efforts to fully understand their operational parameters. These R&D efforts identified problems in the original cell design and means to upgrade the design, performance and reliability of the linear induction cells [2]. Physical changes in the cell oil region, the cell vacuum region, and the cell drivers, together with different operational and maintenance procedures, have been implemented in the refurbished units resulting in greatly enhanced cell performance and reliability. All 74 cells have now been refurbished and tested for acceptance. This paper gives the results of those tests and the performance of the 26 refurbished cells in the Scaled Accelerator. C1 [Nielsen, K.; Barraza, J.; Kang, M.] LANL, Los Alamos, NM 87545 USA. [Prichard, B.] SAIC, Los Alamos, NM 87544 USA. RP Nielsen, K (reprint author), LANL, Los Alamos, NM 87545 USA. EM knielsen@lanl.gov FU Los Alamos National Laboratory; National Nuclear Security Administration of the U.S. Department of Energy [DE-AC52-06NA25396] FX Work supported by Los Alamos National Laboratory which is operated by the Los Alamos National Security, LLC for the National Nuclear Security Administration of the U.S. Department of Energy under contract DE-AC52-06NA25396. 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 BN 978-1-4244-0913-6 PY 2007 BP 1082 EP + DI 10.1109/PPPS.2007.4652376 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300244 ER PT B AU Smith, J Nelson, D Ormond, E Cordova, S Molina, I Corrow, G Hansen, M Henderson, D Lutz, S Mitton, C AF Smith, J. Nelson, D. Ormond, E. Cordova, S. Molina, I. Corrow, G. Hansen, M. Henderson, D. Lutz, S. Mitton, C. GP IEEE TI Cygnus performance in subcritical experiments SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis AB The Cygnus Dual Beam Radiographic Facility consists of two identical radiographic sources with the following specifications: 4-rad dose at 1 m, 1-mm spot size, 50-ns pulse length, 2.25-MeV endpoint energy. The facility is located in an underground tunnel complex at the Nevada Test Site. Here SubCritical Experiments (SCEs) are performed to study the dynamic properties of plutonium [1], [2]. The Cygnus sources were developed as a primary diagnostic for these tests. Since SCEs are single-shot, high-value events - reliability and reproducibility are key issues. Enhanced reliability involves minimization of failure modes through design, inspection, and testing. Many unique hardware and operational features were incorporated into Cygnus to insure reliability. Enhanced reproducibility involves normalization of shot-to-shot output also through design, inspection, and testing. The first SCE to utilize Cygnus, Armando, was executed on May 25, 2004. A year later, April - May 2005, calibrations using a plutonium step wedge were performed. The results from this series were used for more precise interpretation of the Armando data. In the period February - May 2007 Cygnus was fielded on Thermos, which is a series of small-sample plutonium shots using a one-dimemsional geometry. Pulsed power research generally dictates frequent change in hardware configuration. Conversely, SCE applications have typically required constant machine settings. Therefore, while operating during the past four years we have accumulated a large database for evaluation of machine performance under highly consistent operating conditions. Through analysis of this database Cygnus reliability and reproducibility on Armando, Step Wedge, and Thermos is presented. C1 [Smith, J.] Los Alamos Natl Lab, POB 1663,Mail Stop D-410, Los Alamos, NM 87545 USA. [Nelson, D.; Ormond, E.; Cordova, S.; Molina, I.] Sandia Natl Labs, Mercury, NV 89023 USA. [Corrow, G.; Hansen, M.; Henderson, D.; Lutz, S.; Mitton, C.] Natl Secur Technol, North Las Vegas, NV 89030 USA. RP Smith, J (reprint author), Los Alamos Natl Lab, POB 1663,Mail Stop D-410, Los Alamos, NM 87545 USA. EM smith@lanl.gov FU United States Department of Energy FX This work was sponsored by the United States Department of Energy. NR 8 TC 0 Z9 0 U1 1 U2 3 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0913-6 PY 2007 BP 1089 EP + DI 10.1109/PPPS.2007.4652378 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300246 ER PT B AU Ticos, CM Wang, Z Wurden, GA AF Ticos, C. M. Wang, Z. Wurden, G. A. GP IEEE TI Hypervelocity dust storm launched with a coaxial plasma gun SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis ID INJECTION; ACCELERATOR; FLOW AB A dust storm consisting of carbon grains accelerated to speeds up to similar to 3 km/s has been launched by a plasma jet produced in a coaxial gun. Diamond and graphite powders with grain radii of 0.5 to 30 microns have been used. A distinctive feature of this plasma accelerator is that it can use different types of gases and can operate with microparticles having any shape and a large range of sizes. Deuterium gas and carbon dust is chosen to be compatible with fusion plasmas as a diagnostic tool. The operating voltages of the coaxial gun are between 5 and 10 kV and the maximum measured discharge current is similar to 250 kA. Imaging of the plasma jet exiting the gun with speeds of 25 to 60 km/s and accelerated by the J x B force shows a good collimation of the flow for about 1.5 in, before it diffuses into a large a vacuum tank. C1 [Ticos, C. M.; Wang, Z.; Wurden, G. A.] Los Alamos Natl Lab, Plasma Phys Grp P 24, Los Alamos, NM 87545 USA. RP Ticos, CM (reprint author), Los Alamos Natl Lab, Plasma Phys Grp P 24, POB 1663, Los Alamos, NM 87545 USA. RI Ticos, Catalin/F-1677-2011; Wurden, Glen/A-1921-2017 OI Wurden, Glen/0000-0003-2991-1484 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 BN 978-1-4244-0913-6 PY 2007 BP 1106 EP 1109 DI 10.1109/PPPS.2007.4652381 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300249 ER PT B AU Swegle, JA Benford, JN AF Swegle, John A. Benford, James N. GP IEEE TI End-to-end modeling with the HEIMDALL code to scope high-power microwave systems SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis AB In this paper, we describe the expert-system code HEIMDALL, which is used to model full high-power microwave systems using over 60 systems-engineering models, developed in the course of over a decade, that describe the prime and pulsed power, microwave sources, antennas, platforms, and propagation. We show an example of our calculations of the mass of a Supersystern producing 500-MW, 15-ns output pulses in the X band for bursts of 1 s, interspersed with 10-s interburst periods. C1 [Swegle, John A.] Savannah River Natl Lab, 743A, Aiken, SC 29803 USA. [Benford, James N.] Microwave Sci Inc, Lafayette, CA 94549 USA. RP Swegle, JA (reprint author), Savannah River Natl Lab, 743A, Aiken, SC 29803 USA. EM john.swegle@sml.doe.gov FU Air Force Research Laboratory, Rome, NY, USA FX Work supported by the Air Force Research Laboratory, Rome, NY, USA NR 1 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0913-6 PY 2007 BP 1114 EP + DI 10.1109/PPPS.2007.4652383 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300251 ER PT B AU Kaul, AM Rodriguez, G AF Kaul, Ann M. Rodriguez, George GP IEEE TI Experimental series on behavior of post-damage recollected material SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis AB Spallation damage, a typical method of failure for ductile materials, results from the nucleation, growth and coalescence of voids caused by high tensile stress. Specific areas of research on spallation damage include the damage initiation range in convergent geometry, behavior of material recollected after damage, and effects of convergent geometry (shear stresses, etc.) on the material response. Spallation phenomena models are primarily based on experiments using a planar configuration, where a. significant body of data exists from gas gun, laser and high-explosive experiments. Planar experiments allow for one-dimensional analysis of the evolution of failure characteristics. Cylindrical spallation damage experiments allow the additional analysis of the effects of convergence and two-dimensional strains and shear stresses on the spallation profile of a material. These experiments challenge existing computational material models and databases and motivate improved models to increase the predictive capabilities of codes. The ability of pulsed-power to magnetically accelerate and drive high-precision liner-target implosions facilitates cylindrically convergent material properties studies. A first series of experiments (R-Damage-0, -1 and -2) provided data about failure initiation of a well-characterized material (aluminum) in a cylindrical geometry. A second series of experiments (R-Damage-3, 4 and -5) studied the behavior of material recollected after damage from pressures in the damage initiation range. Results from these experiments are presented. C1 [Kaul, Ann M.; Rodriguez, George] Los Alamos Natl Lab, Los Alamos, NM 87544 USA. RP Kaul, AM (reprint author), Los Alamos Natl Lab, POB 1663,MS-F699, Los Alamos, NM 87544 USA. RI Rodriguez, George/G-7571-2012 OI Rodriguez, George/0000-0002-6044-9462 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 BN 978-1-4244-0913-6 PY 2007 BP 1169 EP 1172 DI 10.1109/PPPS.2007.4652395 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300263 ER PT B AU Tully, LK White, AD Goerz, DA Javedani, JB Houck, TL AF Tully, L. K. White, A. D. Goerz, D. A. Javedani, J. B. Houck, T. L. GP IEEE TI Electrostatic modeling of vacuum insulator triple junctions SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis ID THEORETICAL-ANALYSIS; FIELD AB Triple junctions are often initiation points for insulator flashover in pulsed power devices. Two-dimensional finite-element TriComp and Maxwell modeling software suites were utilized for their electrostatic field modeling packages to investigate electric field behavior in the anode and cathode triple junctions of a high voltage vacuum-insulator interface [1,2]. Both codes enable extraction of values from a macroscopic solution for use as boundary conditions in a subset solution. Electric fields computed with this zoom capability correlate with theoretical analysis of the anode and cathode triple junctions within submicron distances for nominal electrode spacing of 1.0 cm. This paper will discuss the iterative zoom process with TriComp and Maxwell finite-element electric field solvers and review theoretical verification of the results. C1 [Tully, L. K.; White, A. D.; Goerz, D. A.; Javedani, J. B.; Houck, T. L.] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Tully, LK (reprint author), Lawrence Livermore Natl Lab, 7000 East Ave, Livermore, CA 94550 USA. 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 BN 978-1-4244-0913-6 PY 2007 BP 1195 EP 1200 DI 10.1109/PPPS.2007.4652401 PG 6 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300269 ER PT B AU Rose, DV Welch, DR Thoma, C Warne, LK Jorgenson, R AF Rose, D. V. Welch, D. R. Thoma, C. Warne, L. K. Jorgenson, R. GP IEEE TI Computational modeling of high pressure gas breakdown and streamer formation in external electric fields SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis AB The development of new computational models of gas breakdown for use in particle-in-cell (PIC) codes is described. These modeling efforts include fundamental processes associated with the breakdown of high pressure gases and represent key components in the comprehensive study of the physics of high-pressure gas switches. Two computational algorithms are discussed; a Monte Carlo type collision (MCC) model whereby PIC macro-particles undergo random elastic and inelastic interactions, and a semi-fluid scattering model. A newly implemented attachment algorithm, important for electronegative gases such as SF6, has been developed. Cross-section compilations for H-2 and SF6 for use in the MCC algorithm are summarized along with the modeling assumptions used to make this model computationally tractable. The results of detailed swarm calculations using these cross-sections are presented along with comparisons to experimental data. An implicit semi-fluid collision PIC model is used to carry out the streamer simulations. These simulations track the formation and evolution of a streamer from a small seed electron population in different applied electric fields. The results of H, and SF, streamer simulations are discussed, including comparisons between the semi-fluid and MCC model for streamer formation and evolution in H-2. C1 [Rose, D. V.; Welch, D. R.; Thoma, C.] Voss Sci LLC, Albuquerque, NM 87108 USA. [Warne, L. K.; Jorgenson, R.] Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. RP Rose, DV (reprint author), Voss Sci LLC, Albuquerque, NM 87108 USA. EM david.rose@vosssci.com FU Sandia National Laboratories; United States Department of Energy's National Nuclear Security Administration [DE-AC04-94-AL85000] FX This work was support by Sandia National Laboratories. Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the United States Department of Energys National Nuclear Security Administration under contract DE-AC04-94-AL85000. NR 11 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0913-6 PY 2007 BP 1205 EP + DI 10.1109/PPPS.2007.4652403 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300271 ER PT B AU Tang, Y Hughes, TP Ekdahl, CA Schulze, ME AF Tang, Yan Hughes, Thomas P. Ekdahl, Carl A. Schulze, Martin E. GP IEEE TI Beam clean-up zone calculations for 2.5MV, 1.4kA experiments on DARHT-2 SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis AB The injector for the second axis of the Dual-Axis Radiographic Hydrotest Facility (DARHT) produces 2 us, 2kA, 3.2 MeV electron beam with a nominal rise time of 600 ns. The injector diode is powered through a ceramic column by a Marx generator. The off-energy electrons (beam head and tail) (luring the rise and fall time are mismatched to the magnetic transport channel. These electrons may hit the accelerating gaps, resulting in insulator flashover or a vacuum arc. The beam cleanup zone (BCUZ) has been designed to remove low energy beam electrons and to keep mismatched charge from reaching the downstream accelerator. Eliminating the beam head requires a strongly dispersive magnetic field tune in the BCUZ. In this paper, we will present simulation results on developing a beam clean-up tune and on the beam transport through BCUZ for 2.5MeV, 1.4kA experiments on DARHT-2 using the particle-in-cell code Lsp and the envelope code Lamda. The energy loss and wall temperature rise, electron stimulated desorption due to beam scrape-off in the BCUZ and the effects of slow approach to the flat top on transport of the beam body are also investigated. In addition, the experimentally measured voltage profiles for the injector diode and the accelerating cells were used in these simulations. The current transport from Lamda calculations is compared with Lsp results. C1 [Tang, Yan] ATK MR, Albuquerque, NM 87110 USA. [Hughes, Thomas P.] Voss Sci, Albuquerque, NM 87108 USA. [Ekdahl, Carl A.] Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. [Schulze, Martin E.] Sci Applicat Int Corp, San Diego, CA 92121 USA. RP Tang, Y (reprint author), ATK MR, Albuquerque, NM 87110 USA. FU Los Alamos National Laboratory FX Work supported by Los Alamos National Laboratory. 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 BN 978-1-4244-0913-6 PY 2007 BP 1257 EP + PG 2 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300283 ER PT B AU DeHope, WJ Jacob, JS Kreitzer, BR Kihara, R Ong, MM Zentler, JM AF DeHope, W. J. Jacob, J. S. Kreitzer, B. R. Kihara, R. Ong, M. M. Zentler, J. M. GP IEEE TI "Real-life" pulse flattening on the LLNL flash X-Ray (FXR) machine SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis ID ELECTRONS; INDUCTION AB High-resolution radiography using high-current electron accelerators based on the linear induction accelerator principle requires the linac's final spot on the X-ray target to be millimeter-sized. The requisite final focusing solenoid is adjusted for a specific beam energy at its entrance, hence, temporal variation of entrance beam energy results in a less than optimal time-averaged spot size. The FXR (Flash X-Ray) induction linac facility at Lawrence Livermore National Laboratory will be briefly described with an emphasis on its pulsed power system. In principle, the pulsed Blumleins at the heart of the system output a square pulse when discharged at the peak of their charging waveform so that, with correct cell timing synchronization, the effective beam output into the final focusing solenoid should be optimally flat. We have found that real-life consideration of transmission line and pulse power details in both the injector and accelerator sections of the machine results in significant energy variations in the final beam. We have implemented methods of measurement and analysis that permits this situation to be quantified and improved upon. The improvement will be linked to final beam spot size and enhancement in expected radiographic resolution. C1 [DeHope, W. J.; Jacob, J. S.; Kreitzer, B. R.; Kihara, R.; Ong, M. M.; Zentler, J. M.] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP DeHope, WJ (reprint author), Lawrence Livermore Natl Lab, POB 808, Livermore, CA 94550 USA. 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 BN 978-1-4244-0913-6 PY 2007 BP 1261 EP 1263 DI 10.1109/PPPS.2007.4652416 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300284 ER PT B AU Leckbee, J Oliver, B Maenchen, J Portillo, S Johnston, M Hahn, K Rovang, D Molina, I Cordova, S Johnson, DL Van De Varde, DM AF Leckbee, Joshua Oliver, Bryan Maenchen, John Portillo, Sal Johnston, Mark Hahn, Kelly Rovang, Dean Molina, Isidro Cordova, Steve Johnson, David L. Van De Varde, David M. GP IEEE TI RETS-6 output pulse modifications SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis ID FLOW AB The RITS accelerator was upgraded from three pulse forming lines (PFL) and inductive voltage adder (IVA) cells to six PFLs and IVA cells during 2005 with radiographic diode experiments beginning in 2006 [1], [2]. The original RITS-6 accelerator configuration is capable of operation at voltages greater than 10 MV with a 80-Omega magnetically-insulated transmission line (MITL). Low impedance diodes such as the self-magnetic pinch (SMP) diode are not matched well to the high impedance MITL and decrease the diode voltage to about 5 MV. A low impedance MITL has been designed and tested with an operating impedance of about 40 Omega at the output end. Experimental results with both MITL impedances will be presented. The output pulse shape of the RITS-6 accelerator can be modified to emulate other accelerators and to investigate the impact of various pulse features on radiographic diode performance. Simulations and experimental results are discussed below. C1 [Leckbee, Joshua; Oliver, Bryan; Maenchen, John; Portillo, Sal; Johnston, Mark; Hahn, Kelly; Rovang, Dean; Molina, Isidro; Cordova, Steve] Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Leckbee, J (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. NR 6 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0913-6 PY 2007 BP 1264 EP 1267 DI 10.1109/PPPS.2007.4652417 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300285 ER PT B AU Bailey, VL Corcoran, P Johnson, DL Smith, I Oliver, B Maenchen, J AF Bailey, Vernon L. Corcoran, Patrick Johnson, David L. Smith, Ian Oliver, Bryan Maenchen, John GP IEEE TI Influence of variable impedance terminations and input voltages on the operating conditions of an under-matched magnetically-insulated transmission line SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis ID FLOW AB Termination of a magnetically-insulated transmission line (MITL) with an impedance that is less than the matched MITL operating impedance launches a re-trapping wave back up the MITL toward the source. A previous investigation [1] obtained the relationship for the MITL operating conditions (voltage and current) after the passage of the re-trapping wave that depended on the input voltage, the termination impedance, and the MITL operating conditions based on parapotential flow at minimum current [2]. The relationship was in agreement with detailed particle-in-cell (PIC) simulations and experiments investigating the re-trapping wave process for large area diodes. The scaling law and simulations however were only applied to a constant input (forward going) voltage and termination impedance. This paper extends those PIC simulations and wave analyses to MITL operating conditions for termination impedances and input voltages that are functions of time. The objective is to determine the constitutive relationships for the propagation of insulation waves that propagate from the voltage source to the load and re-trapping waves that propagate from the under-matched load to the source. Wave propagation questions of hysteresis, superposition, transmission, and reflection coefficients are addressed. Particle-in-Cell simulations based on the RITS-6 [3] dustbin geometry are used extensively in the analyses and compared with linear and non-linear wave propagation. The possibility of treating the MITL as a series of transmission lines is addressed. C1 [Bailey, Vernon L.; Corcoran, Patrick; Johnson, David L.; Smith, Ian] L3 Commun Pulse Sci, 2700 Merced, San Leandro, CA 94577 USA. [Oliver, Bryan; Maenchen, John] Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. RP Bailey, VL (reprint author), L3 Commun Pulse Sci, 2700 Merced, San Leandro, CA 94577 USA. FU Sandia Corporation, a Lockheed Martin Company [DE-AC04-94AL85000] FX Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the United States Department of Energys National Nuclear Security Administration under contract DE-AC04-94AL85000. 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 BN 978-1-4244-0913-6 PY 2007 BP 1268 EP + DI 10.1109/PPPS.2007.4652418 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300286 ER PT B AU Zhang, W Ng, W Pai, C Sandberg, J Tan, Y Tian, Y AF Zhang, W. Ng, W. Pai, C. Sandberg, J. Tan, Y. Tian, Y. GP IEEE TI Inductive voltage adder network analyses and model simplification SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis AB Inductive voltage adder topology has attracted great attentions in pulse power community for near two decades. However, there has been lack of literatures on inductive voltage adder network analysis and circuit design model. We have recently developed a simplified model and a set of simple formulas. An expanded model and more detailed analysis are presented in this paper. Our model reveals the relationship of output waveform parameters and hardware designs. Computer simulations have demonstrated that parameter estimation based on this approach is accurate. This approach can be used in early stages of project development to assist feasibility study, geometry selection in engineering design, and parameter selection of critical components. A set of fundamental estimation formulas including system impedance, rise time, and number of stages are presented. This approach is also applicable to induction LINAC design. In addition, the model presented in this paper shows a new topology of high voltage waveform generator. C1 [Zhang, W.; Ng, W.; Pai, C.; Sandberg, J.; Tan, Y.; Tian, Y.] Brookhaven Natl Lab, Upton, NY 11973 USA. RP Zhang, W (reprint author), Brookhaven Natl Lab, Upton, NY 11973 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 BN 978-1-4244-0913-6 PY 2007 BP 1280 EP 1283 DI 10.1109/PPPS.2007.4652421 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300289 ER PT B AU Nelson, D Ormond, E Cordova, S Molina, I Smith, J Corrow, G Hansen, M Henderson, D Mitton, C AF Nelson, D. Ormond, E. Cordova, S. Molina, I. Smith, J. Corrow, G. Hansen, M. Henderson, D. Mitton, C. GP IEEE TI Cygnus trigger system SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis AB The Cygnus Dual Beam Radiographic Facility consists of two radiographic sources (Cygnus 1, Cygnus 2) each with a dose rating of 4 rads at 1 m, and a 1-mm diameter spot size. The electrical specifications are: 2.25 MV, 60 kA, 60 ns. This facility is located in an underground environment at the Nevada Test Site (NTS). These sources were developed as a primary diagnostic for subcritical tests, which are single-shot, high-value events. In such an application there is an emphasis on reliability and reproducibility. A robust, low-jitter trigger system is a key element for meeting these goals. The trigger system was developed with both commercial and project-specific equipment. In addition to the traditional functions of a trigger system there are novel features added to protect the investment of a high-value shot. Details of the trigger system, including elements designed specifically for a subcritical test application, will be presented. The individual electronic components have their nominal throughput, and when assembled have a system throughput with a measured range of jitter. The shot-to-shot jitter will be assessed both individually and in combination. Trigger reliability and reproducibility results will be presented for a substantial number of shots executed at the NTS. C1 [Nelson, D.; Ormond, E.; Cordova, S.; Molina, I.] Sandia Natl Labs, POB 5800,Mail Stop 1176, Albuquerque, NM 87185 USA. [Smith, J.] Los Alamos Natl Lab, Los Alamos, NM 87545 USA. [Corrow, G.; Hansen, M.; Henderson, D.; Mitton, C.] Natl Secur Technol, Las Vegas, NV 89030 USA. RP Nelson, D (reprint author), Sandia Natl Labs, POB 5800,Mail Stop 1176, Albuquerque, NM 87185 USA. EM dsnelso@sandia.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 BN 978-1-4244-0913-6 PY 2007 BP 1313 EP + DI 10.1109/PPPS.2007.4652429 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300297 ER PT B AU Goforth, JH Fowler, CM Herrera, DH Lopez, EA Oona, H Tasker, DG Torres, DT Anderson, RA Baluyot, EV Clancy, TJ Milhous, DP Reisman, DB White, AD AF Goforth, J. H. Fowler, C. M. Herrera, D. H. Lopez, E. A. Oona, H. Tasker, D. G. Torres, D. T. Anderson, R. A. Baluyot, E. V. Clancy, T. J. Milhous, D. P. Reisman, D. B. White, A. D. GP IEEE TI The ranchito Helical magnetic flux compression generator SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis AB The Ranchito helical flux compression generator (HFCG) was designed at Los Alamos in the mid 1990s by Max Fowler. The intent was to supply a few megamperes as the initial current for a fast high cur-rent FCG in situations where large capacitor banks were not available. A complete characterization of Ranchito has never been published. However, a recent experiment was conducted that provides data suitable for publication. In the test a Ranchito generator was used to feed current into a simulated plate generator. In the test, we supplied 17.24 kA initial current to the 125 mu H Ranchito from a capacitor bank, and a 2.75 MA current was subsequently delivered to a load of 287 nH. Full details of the generator design and experimental results are presented in the paper. Our analysis makes use of an inductance (L(t)) curve taken from paper copies in Max Fowler's original notes, and follows the approach used by Fowler and Caird(1) to characterize the MK-IX HFCG. A complete working model of Ranchito results, although newer computer codes may now provide a better approach. The data presented are useful for comparing results from newer models. C1 [Goforth, J. H.; Fowler, C. M.; Herrera, D. H.; Lopez, E. A.; Oona, H.; Tasker, D. G.; Torres, D. T.] Los Alamos Natl Lab, Los Alamos, NM 87544 USA. [Anderson, R. A.; Baluyot, E. V.; Clancy, T. J.; Milhous, D. P.; Reisman, D. B.; White, A. D.] Lawrence Livermore Natl Lab, Livermore, CA USA. RP Goforth, JH (reprint author), Los Alamos Natl Lab, Los Alamos, NM 87544 USA. 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 978-1-4244-0913-6 PY 2007 BP 1343 EP + DI 10.1109/PPPS.2007.4652436 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300304 ER PT B AU Tasker, DG Goforth, JH Oona, H AF Tasker, D. G. Goforth, J. H. Oona, H. GP IEEE TI High accuracy insentropic compression studies with high explosive pulsed power SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis AB An study of the one-dimensional isentropic compression experiment (ICE), performed with High Explosive Pulsed Power (HEPP), has demonstrated that accurate, high stress, isentropic Equations of State (EOS) data may be obtained with this technique. The physics and accuracy of electromagnetic loading in the ICE technique is presented. It is shown that the HEPP-ICE load configuration is capable of producing magnetic stresses that are uniform to 1 part in 1000 over the central 87% of the sample faces, and that HEPP-ICE provides exact matching of the stresses between opposing samples. This magnetic uniformity, the exact matching, and the large sample samples possible with BEPP-ICE, are necessary for the highest accuracy isentropic EOS data. Isentropic EOS data have been obtained with a prototype HEPP-ICE system, and the results for tungsten and copper demonstrate the inaccuracy of the technique, which may be as low as 0.2% in stress. It is shown that a large-scale HEPP-ICE system is capable of producing shock-free loading up to 2.2 TPa in 10-mm thick tungsten samples. C1 [Tasker, D. G.; Goforth, J. H.; Oona, H.] Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Tasker, DG (reprint author), Los Alamos Natl Lab, DE-6, Los Alamos, NM 87545 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 BN 978-1-4244-0913-6 PY 2007 BP 1364 EP 1367 DI 10.1109/PPPS.2007.4652441 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300309 ER PT B AU Hartemann, FV Anderson, SG Gibson, DJ Hagmann, CA Johnson, MS Jovanovic, I Messerly, MJ Pruet, JA Shverdin, MY Tremaine, AM McNabb, DP Siders, CW Barty, CPJ AF Hartemann, F. V. Anderson, S. G. Gibson, D. J. Hagmann, C. A. Johnson, M. S. Jovanovic, I. Messerly, M. J. Pruet, J. A. Shverdin, M. Y. Tremaine, A. M. McNabb, D. P. Siders, C. W. Barty, C. P. J. GP IEEE TI Gamma-ray compton light source development at LLNL SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis AB A new class of tunable, monochromatic gamma-ray sources capable of operating at high peak and average brightness is currently being developed at LLNL for nuclear photo-science and applications. These novel systems are based on Compton scattering of laser photons by a high brightness relativistic electron beam produced by an rf photoinjector. A prototype, capable of producing > 10(8) 0.7 MeV photons in a single shot, with a fractional bandwidth of 1%, and a repetition rate of 10 Hz, is currently under construction at LLNL; this system will be used to perform nuclear resonance fluorescence experiments. A new symmetrized S-band rf gun, using a Mg photocathode, will produce up to 1 nC of charge in an 8 ps bunch, with a normalized emittance modeled at 0.8 mm.mrad; electrons are subsequently accelerated up to 120 MeV to interact with a 500 mJ, 10 ps, 355 nm laser pulse and generate gamma-rays. The laser front end is a fiber-based system, using corrugated-fiber Bragg gratings for stretching, and drives both the frequency-quadrupled photocathode illumination laser and the Nd:YAG interaction laser. Two new technologies are used in the laser: a hyper-Michelson temporal pulse stacker capable of producing 8 ps square UV pulses, and a hyper-dispersion compressor for the interaction laser. Other key technologies, basic scaling laws, and recent experimental results will also be presented, along with an overview of future research and development directions. C1 [Hartemann, F. V.; Anderson, S. G.; Gibson, D. J.; Hagmann, C. A.; Johnson, M. S.; Jovanovic, I.; Messerly, M. J.; Pruet, J. A.; Shverdin, M. Y.; Tremaine, A. M.; McNabb, D. P.; Siders, C. W.; Barty, C. P. J.] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Hartemann, FV (reprint author), Lawrence Livermore Natl Lab, Livermore, CA 94550 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 BN 978-1-4244-0913-6 PY 2007 BP 1382 EP 1386 DI 10.1109/PPPS.2007.4652445 PG 5 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300313 ER PT B AU Mason, RJ Wei, M Beg, F Stephens, RB Snell, CM AF Mason, R. J. Wei, M. Beg, F. Stephens, R. B. Snell, C. M. GP IEEE TI e-plas analysis of short pulse laser-matter interaction experiments SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis AB The transport of relativistic electrons' generated in wire and foil targets by short-pulse lasers is examined with the new e-PLAS simulation code based on implicit-moment/hybrid(2) techniques. In a 50 mu m diameter Cu wire (Z(eff) = 15) as recently illuminated on the TITAN LLNL laser, for example, a 1.7x10(20) W/cm(2) simulated laser beam delivering a flat 30 mu m spot from the left (with 40 % absorption) generates the hot electron density profile depicted below at 940 fs. The peak hot density in the laser spot is similar to 3x10(21) electrons/cm(3). This density drops to 3x10(19) electrons/cm(3) 200 microns into the wire. A peak temperature of 2 keV is achieved through Joule heating of the background electrons in the wire '' head '' near the deposition surface; a significantly lower similar to 0.4 keV is achieved in the wire body. Here, 300 MG thermoelectric B-fields are also calculated. Parameter studies relate the hot electron stopping to the surface B-field, modest drag slowing, and the background cold electron resisitvity, which is bleached by background heating to low values at late times. C1 [Mason, R. J.] Appl Res Corp, Los Alamos, NM 87544 USA. [Wei, M.; Beg, F.] Univ Calif San Diego, La Jolla, CA 92093 USA. [Stephens, R. B.] Gen Atom, San Diego, CA 92121 USA. [Snell, C. M.] Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Mason, RJ (reprint author), Appl Res Corp, Los Alamos, NM 87544 USA. EM rodmason01@msn.com OI Stephens, Richard/0000-0002-7034-6141 FU USDOE through GA FX Work supported in part by the USDOE through GA. 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 BN 978-1-4244-0913-6 PY 2007 BP 1387 EP + DI 10.1109/PPPS.2007.4652446 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300314 ER PT B AU Rosocha, LA Kim, Y Anderson, GK Abbate, S Sanchez-Gonzalez, R AF Rosocha, L. A. Kim, Y. Anderson, G. K. Abbate, S. Sanchez-Gonzalez, R. GP IEEE TI Non-thermal plasma-assisted combustion research at Los Alamos SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis ID DIELECTRIC BARRIER DISCHARGES; ENHANCEMENT AB The application of electric fields to flames has been reported as early as 1814, was applied to furnaces in the 1920's and developed into several applications in the last half of the 20th Century. When the electric field strength is sufficient to cause electrical breakdown of a fuel or fuel/air mixture, plasma effects will dominate. Plasma effects can increase electron and ion temperatures and promote combustion through the formation of 'active' species (such as free radicals) or the dissociation of fuel molecules into smaller, easily-combusted fragments [I]. Plasma-assisted combustion (PAC) is now a timely research topic worldwide [2], pointing to more efficient fossil-fuel usage, conversion of low-grade fuels into higher-grade fuels, and pollution reduction through ultra-lean burn combustion. Our work focuses on non-thermal ('cold') plasmas (NTPs), particularly for enhancing combustion stability, efficiency, and reducing undesirable emissions. This is in contrast to thermal ('' hot '') plasmas. Here we discuss representative PAC experiments focused on combustion stability, efficiency, and pollution reduction. Our work has been mainly carried out with silent electrical discharges (also called dielectric-barrier discharges - DBDs) - where only the fuel is activated. DBDs are convenient sources for producing atmospheric-pressure NTPs. Using DBD devices, we have tested hydrocarbon fuel activation/conversion systems that fragment hydrocarbons into smaller compounds, increase flame speed, stabilize flames, and operate in very lean burn regimes (where the production of pollutants such as NO, and CO are expected to decrease). Experiments have been carried out with methane, ethane, propane and butane, as well as the gasoline surrogate liquid iso-octane. C1 [Rosocha, L. A.; Kim, Y.] Los Alamos Natl Lab, Plasma Phys Grp, Los Alamos, NM 87544 USA. [Anderson, G. K.] Los Alamos Natl Lab, Phys Chem & Appl Spect Grp, Los Alamos, NM 87544 USA. [Abbate, S.] Off Natl Etud & Rech Aerosp, Paris, France. [Sanchez-Gonzalez, R.] Univ Autonom Queretaro, Queretaro, Mexico. RP Rosocha, LA (reprint author), Los Alamos Natl Lab, Plasma Phys Grp, Los Alamos, NM 87544 USA. EM rosocha@lanl.gov RI Sanchez-Gonzalez, Rodrigo/O-5216-2014 OI Sanchez-Gonzalez, Rodrigo/0000-0002-4477-3799 FU Los Alamos National laboratory LDRD fund; US Dept of Energy [DEAC52-06NA25396] FX Work supported by the Los Alamos National laboratory LDRD fund, US Dept of Energy under contract number DEAC52-06NA25396 NR 6 TC 0 Z9 0 U1 0 U2 8 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0913-6 PY 2007 BP 1391 EP + DI 10.1109/PPPS.2007.4652447 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300315 ER PT B AU Kim, M Ambhore, A Kim, Y AF Kim, M. Ambhore, A. Kim, Y. GP IEEE TI Fuel reforming using dielectric barrier discharge and reformed fuel effects on bunsen flame SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis ID METHANE AB Methane and propane have been reformed using a dielectric barrier discharge (DBD) and the effect of the reformed fuel species on the combustion was investigated at a BUNSEN burner. The main output species of the DBD fuel reformer are composed of mixtures of hydrogen and other small hydrocarbons. DBD fuel reformer shows the characteristic of filamentary microdischarge. The conversion rate was less than 10% due to the low power loading of the DBD reactor. The reformed fuel species affect the BUNSEN burner flame significantly at high equivalence ratio and have an minor effect at stoichiometric and lean operating conditions. Experimental and numerical analyses are needed to investigate the effect of the reformed fuel on the combustion phenomena. C1 [Kim, M.; Ambhore, A.] Univ Texas El Paso, Mech Engn, 500W Univ Ave, El Paso, TX 79968 USA. [Kim, Y.] Los Alamos Natl Lab, Plasma Phys Grp, Los Alamos, NM USA. RP Kim, M (reprint author), Univ Texas El Paso, Mech Engn, 500W Univ Ave, El Paso, TX 79968 USA. 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 BN 978-1-4244-0913-6 PY 2007 BP 1395 EP + DI 10.1109/PPPS.2007.4652448 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300316 ER PT B AU Arnold, PA Hulsey, SD Ullery, GT Petersen, DE Pendleton, DL Ollis, CW Newton, MA Harwell, T Cordoza, D Hadovski, L AF Arnold, P. A. Hulsey, S. D. Ullery, G. T. Petersen, D. E. Pendleton, D. L. Ollis, C. W. Newton, M. A. Harwell, T. Cordoza, D. Hadovski, L. GP IEEE TI Status of the NIF Power Conditioning System SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis AB The NIF Power Conditioning System provides the pulsed excitation required to drive flashlamps in the laser's optical amplifiers. Modular in design, each of the 192 Main Energy Storage Modules (MESMs) storage up to 2.2 MJ of electrical energy in its capacitor bank before delivering the energy to 20 pairs of flashlamps in a 400 mu s pulse (10% power points). The peak current of each MESM discharge is 0.5 MA. Production, installation, commissioning and operation of the NIF Power Conditioning continue to progress rapidly, with the goals of completing accelerated production in late 2007 and finishing commissioning by early 2008, all the while maintaining an aggressive operations schedule. To date, more than 80% of the required modules have been assembled, shipped and installed in the facility, representing more that 240 MJ of stored energy available for driving NIF flashlamps. The MESMs have displayed outstanding reliability during daily, multiple-shift operations. C1 [Arnold, P. A.; Hulsey, S. D.; Ullery, G. T.; Petersen, D. E.; Pendleton, D. L.; Ollis, C. W.; Newton, M. A.] Lawrence Livermore Natl Lab, 7000 E Ave, Livermore, CA 94550 USA. [Harwell, T.; Cordoza, D.; Hadovski, L.] Raytheon Tech Serv, Chula Vista, CA USA. RP Arnold, PA (reprint author), Lawrence Livermore Natl Lab, 7000 E Ave, Livermore, CA 94550 USA. FU University of California Lawrence Livermore National Laboratory [W-7405-Eng-48] FX This work performed under the auspices of the U.S. Department of Energy by University of California Lawrence Livermore National Laboratory under contract No.W-7405-Eng-48. 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 978-1-4244-0913-6 PY 2007 BP 1457 EP + DI 10.1109/PPPS.2007.4652462 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300330 ER PT B AU Barbosa, F Arnold, PA Hinz, AF Zacharias, RA Ollis, CW Fulkerson, ES Mchale, B Runtal, A Bishop, CL AF Barbosa, F. Arnold, P. A. Hinz, A. F. Zacharias, R. A. Ollis, C. W. Fulkerson, E. S. Mchale, B. Runtal, A. Bishop, C. L. GP IEEE TI Plasma Electrode Pockels Cell subsystem performance in the National Ignition Facility SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis AB The Plasma Electrode Pockels Cell (PEPC) subsystem is a key component of the National Ignition Facility, enabling the laser to employ an efficient four-pass main amplifier architecture. PEPC relies on a pulsed power technology to initiate and maintain plasma within the cells and to provide the necessary high voltage bias to the cells' nonlinear crystals. Ultimately, nearly 300 high-voltage, high-current pulse generators will be deployed in the NIF in support of PEPC. Production of solid-state plasma pulse generators and thyratron-switched pulse generators is now complete, with the majority of the hardware deployed in the facility. An entire cluster (one-fourth of a complete NIF) has been commissioned and is operating on a routine basis, supporting laser shot operations. Another cluster has been deployed, awaiting final commissioning. Activation and commissioning of new hardware continues to progress in parallel, driving toward a goal of completing the PEPC subsystem in late 2007. C1 [Barbosa, F.; Arnold, P. A.; Hinz, A. F.; Zacharias, R. A.; Ollis, C. W.; Fulkerson, E. S.; Mchale, B.; Runtal, A.] Lawrence Livermore Natl Lab, 7000 E Ave, Livermore, CA 94551 USA. [Bishop, C. L.] IAP World Serv, Livermore, CA 94551 USA. RP Barbosa, F (reprint author), Lawrence Livermore Natl Lab, 7000 E Ave, Livermore, CA 94551 USA. NR 4 TC 0 Z9 0 U1 0 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0913-6 PY 2007 BP 1462 EP + DI 10.1109/PPPS.2007.4652463 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300331 ER PT B AU Arnold, PA Barbosa, F Cook, EG Hickman, BC Akana, GL Brooksby, CA AF Arnold, P. A. Barbosa, F. Cook, E. G. Hickman, B. C. Akana, G. L. Brooksby, C. A. GP IEEE TI A high current, high voltage solid-state pulse generator for the NIF Plasma Electrode Pockels Cell SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis AB A high current, high voltage, all solid-state pulse modulator has been developed for use in the Plasma Electrode Pockels Cell (PEPC) subsystem in the National Ignition Facility. The MOSFET-switched pulse generator, designed to be a more capable plug-in replacement for the thyratron- switched units currently deployed in NIF, offers unprecedented capabilities including, burst-mode operation, pulse width agility and a steady-state pulse repetition frequency exceeding 1 Hz. Capable of delivering requisite fast risetime, 17 kV flattop pulses into a 6 Omega load, the pulser employs a modular architecture characteristic of the inductive adder technology, pioneered at LLNL for use in acceleration applications', which keeps primary voltages low (and well within the capabilities of existing FET technology), reduces fabrication costs and is amenable to rapid assembly and quick field repairs. C1 [Arnold, P. A.; Barbosa, F.] Lawrence Livermore Natl Lab, Natl Ignit Facil, 7000 E Ave, Livermore, CA 94550 USA. [Cook, E. G.; Hickman, B. C.; Akana, G. L.] Lawrence Livermore Natl Lab, Beam Res Program, Livermore, CA USA. [Brooksby, C. A.] Natl Secur Technol, Livermore, CA USA. RP Arnold, PA (reprint author), Lawrence Livermore Natl Lab, Natl Ignit Facil, 7000 E Ave, Livermore, CA 94550 USA. FU U.S. Department of Energy; University of California Lawrence Livermore National Laboratory [W-7405-Eng-48]; Laboratory for Laser Energetics under the U.S. Department of Energy; University of Rochester Cooperative Agreement [DE-FC09-92SF19460] FX This work performed under the auspices of the U.S. Department of Energy by the University of California Lawrence Livermore National Laboratory under Contract No. W-7405-Eng-48 and supported by the Laboratory for Laser Energetics under the U.S. Department of Energy University of Rochester Cooperative Agreement No. DE-FC09-92SF19460. 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 BN 978-1-4244-0913-6 PY 2007 BP 1468 EP + DI 10.1109/PPPS.2007.4652464 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300332 ER PT B AU Merritt, B Dreifuerst, G James, G Strickland, S Tse, E AF Merritt, B. Dreifuerst, G. James, G. Strickland, S. Tse, E. GP IEEE TI 15 kJ Flash Lamp, Power Conditioning Unit designed for safety, reliability & manufacturability SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis AB A 15kJoule, Hash Lamp Power Conditioning Unit has been successfully designed, developed, and deployed in the National Ignition Facility (NIF) Preamplifier Modules (PAM). The primary design philosophy of this power conditioning unit (PCU) is safety, reliability, and manufacturability. Cost reduction over commercially equivalent systems was also achieved through an easily manufactured packaging design optimized to meet NIF requirements. While still maintaining low cost, the PCU design includes a robust control system, fault diagnostic system, and safety features. The pulsed power design includes 6 PFN modules, each including a dual series injection trigger transformer, that drive a total of 12 flash lamp loads. The lamps are individually triggered via a 20kV pulse produced by a 1kV, MCT switched capacitive discharge unit on the primary side of the trigger transformer. The remote control interface includes an embedded controller that captures flash lamp current wave forms and fault status for each shot. The embedded controller provides the flexibility of remotely adjusting both the main drive voltage from 1.6 to 2.5 kV and the trigger voltage from 0 to 20 kV. C1 [Merritt, B.; Dreifuerst, G.; James, G.; Strickland, S.; Tse, E.] Lawrence Livermore Natl Lab, Natl Ignit Facil, Livermore, CA 94550 USA. RP Merritt, B (reprint author), Lawrence Livermore Natl Lab, Natl Ignit Facil, 7000 E Ave, Livermore, CA 94550 USA. NR 5 TC 0 Z9 0 U1 1 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0913-6 PY 2007 BP 1473 EP 1478 DI 10.1109/PPPS.2007.4652465 PG 6 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300333 ER PT B AU Cassel, RL Nguyen, MN Cook, E Brooksby, C AF Cassel, R. L. Nguyen, M. N. Cook, E. Brooksby, C. GP IEEE TI A hybrid solid state induction modulator for klystrons SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis AB A solid state induction modulator was designed and operated for the Next Linear Collider accelerator project at SLAC (Stanford Linear Accelerator Center) to drive 8 X-band klystron. With the redirection of the NLC physics program, the remaining hardware from the DIM (Design for Manufacturability) modulator was combined with existing pulse transformers to fabricate two Hybrid Solid State Induction Modulators, one to drive two XK5 klystrons at 420kV 400A 1.5 mu S and a second modulator to drive a single 5045 klystron to 360kV 430 A 3.5 mu S. These modulators use the induction section to drive a conventional pulse transformer. Both these modulator are smaller and operate at a lower voltage than the thyratron driven PIN equivalent. These modulator have been fabricated, tested, and are in operation. The design, implementation, and results will be describe in the paper. C1 [Cassel, R. L.; Nguyen, M. N.] SLAC, Menlo Pk, CA USA. [Cook, E.] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. [Brooksby, C.] NSTec, Livermore, CA 94551 USA. RP Cassel, RL (reprint author), SLAC, Menlo Pk, CA USA. 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 978-1-4244-0913-6 PY 2007 BP 1609 EP + DI 10.1109/PPPS.2007.4652496 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300364 ER PT B AU Krasnykh, A AF Krasnykh, Anatoly GP IEEE TI A topology of ON/OFF Marx modulator with protection of load and solid state switches SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis AB This article discusses a proposal for an ultra fast feedback response that will protect the load and solid state switches of the ON/OFF Marx type modulators. The feedback guards main elements of a modulator against possible arcs in the load, particularly arcs inside of the electron guns. The chief concept behind the proposed response system is an employment of a fraction of the output modulator power as a controlling and guarding pulse during the delivery time. The time constant of the proposed feedback loop lies in the nanosecond range. Peculiarities of proposed topology are discussed. C1 Stanford Linear Accelerator Ctr, Klystron & Microwave Dept, Menlo Pk, CA 94025 USA. RP Krasnykh, A (reprint author), Stanford Linear Accelerator Ctr, Klystron & Microwave Dept, 2575 Sand Hill Rd,M-S 33, Menlo Pk, CA 94025 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 BN 978-1-4244-0913-6 PY 2007 BP 1612 EP 1614 DI 10.1109/PPPS.2007.4652497 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300365 ER PT B AU Krasnykh, A AF Krasnykh, Anatoly GP IEEE TI A coreless approaches for ON/OFF Marx type modulators SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis AB SLAC was first to report using ON/OFF switches in Marx type modulator [1, 2]. The development of Marx type modulator was bounded with the NLC need. The high energy physics runs based on the ILC concept where longer modulator pulse width is required. The SLAC idea of coreless modulators was useful for other applications (medicine, military, home security, etc.). The discussed conception is presented as a continuation of the earlier published articles. Several types of the Marx ON/OFF type modulators are under consideration. This article describes the new coreless approach, based on the solid state ON/OFF Marx's topology. An AC high voltage network feeds individual Marx's cells through the inductive and diode assemblies. Further integration of the ON/OFF Marx type modulator and its power supply is proposed. Two topologies are under consideration. The first scheme is an integration of DC/DC converters with ON/OFF Marx. The second topology is based on the usage of AC network directly with ON/OFF Marx scheme. C1 Stanford Linear Accelerator Ctr, Klystron & Microwave Dept, Menlo Pk, CA 94025 USA. RP Krasnykh, A (reprint author), Stanford Linear Accelerator Ctr, Klystron & Microwave Dept, Menlo Pk, CA 94025 USA. NR 5 TC 0 Z9 0 U1 0 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0913-6 PY 2007 BP 1615 EP 1617 DI 10.1109/PPPS.2007.4652498 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300366 ER PT B AU Makhin, V Awe, TJ Bauer, BS Esaulov, A Lindemuth, IR Siemon, RE Atchison, WL Frese, MH Frese, SD Faehl, RJ Desjarlais, MP Garanin, SF AF Makhin, V. Awe, T. J. Bauer, B. S. Esaulov, A. Lindemuth, I. R. Siemon, R. E. Atchison, W. L. Frese, M. H. Frese, S. D. Faehl, R. J. Desjarlais, M. P. Garanin, S. F. GP IEEE TI Numerical modeling of plasma formation with megagauss magnetic fields SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis AB Recently a set of experiments was conducted on thick 1-mm diameter wires (rods) on the Zebra (1MA) machine at the University of Nevada, Reno. The goal of the experiments was to investigate plasma creation on the surface in the presence of megagauss magnetic field. Laser backlighting, photo detectors, and a gated image intensifier were used to measure radial expansion and surface luminosity. A unique type of rod with a machined hourglass shape to eliminate electrode connections was investigated to avoid influence of plasma formed in the vicinity of the usual electrode connections. Reasonably good agreement is found between numerical modeling of radius expansion in time and experimental results obtained from laser diagnostics (shadowgraphs) and intensifier images. Initial efforts are also presented on comparisons between data and a variety of numerical codes used to model this deceptively simple configuration. C1 [Makhin, V.; Awe, T. J.; Bauer, B. S.; Esaulov, A.; Lindemuth, I. R.; Siemon, R. E.] Univ Nevada, Mail Stop 220 1664 N Virginia Str, Reno, NV 89557 USA. [Atchison, W. L.] Los Alamos Natl Lab, Los Alamos, NM USA. [Frese, M. H.; Frese, S. D.] NumerEx Inc, Albuquerque, NM USA. [Faehl, R. J.] Los Alamos Natl Lab, Los Alamos, NM USA. [Desjarlais, M. P.] Sandia Natl Labs, Albuquerque, NM USA. [Garanin, S. F.] VNIIEF, Sarov, Russia. RP Makhin, V (reprint author), Univ Nevada, Mail Stop 220 1664 N Virginia Str, Reno, NV 89557 USA. FU DOEDE-FG02-04ER54752; [DE-FG02-06ER54892] FX Work supported by DOE grants OFES DE-FG02-04ER54752 and DE-FG02-06ER54892. NR 6 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0913-6 PY 2007 BP 1669 EP + DI 10.1109/PPPS.2007.4652511 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300379 ER PT B AU Grabowski, C Degnan, J Babineau, M Camacho, F Coffey, S Coulter, G Domonkos, M Gale, D Martinez, B Parker, J Rarph, D Ruden, E Sommars, W Hsu, S Intrator, T Renneke, R Sieck, P Waganaar, B Wurden, G AF Grabowski, Chris Degnan, James Babineau, Mark Camacho, Frank Coffey, Sean Coulter, Gordon Domonkos, Matt Gale, Don Martinez, Bernard Parker, Jerry Rarph, Dale Ruden, Ed Sommars, Wayne Hsu, Scott Intrator, Tom Renneke, Richard Sieck, Paul Waganaar, Birr Wurden, Glen GP IEEE TI FRC compression heating experiment (FRCHX) at AFRL SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis ID REVERSED CONFIGURATION PLASMA; MAGNETIZED TARGET FUSION AB Over the past seven years, the Air Force Research Laboratory in Albuquerque, NM has been working in close collaboration with Los Alamos National Laboratory on their field-reversed configuration (FRC) experiment, FRX-L. Through these joint efforts a second experiment has been designed and is now being assembled and tested at the AFRL. This new experiment, which is referred to as the FRC Heating Experiment (FRCHX), has the goal of not only forming a plasma in a field-reversed configuration but of also translating it into an aluminum flux conserving shell (solid liner), where it will be subsequently heated through rapid compression of the liner. The FRC formation portion of FRCHX has been designed to closely match the electrical properties of FRX-L so that FRCs of similar parameters can be formed. Likewise, the translation portion of FRCHX, which has been designed and fabricated concurrently with the new translation section of FRX-L, also closely matches that of FRX-L. The design approach being taken to compressively heat the FRC in the final portion of FRCHX relies on the experimental setup used during two earlier "deformable-contact" vacuum liner experiments that were performed with the Shiva Star Capacitor Bank. In these experiments the liner electrodes had 8-cm-diameter holes on their axes, and both tests were found to be successful in that the ends of the 10-cm diameter, 30-cm long aluminum liner stretched and maintained contact with the electrodes while the body of the liner glided radially inward to implode uniformly. This presentation focuses on the system design and integration of the first two portions of the FRCHX experiment, the FRC formation and translation sections. The measured and/or intended performance of each are discussed, along with the various magnetic and plasma diagnostics that are being fielded in both sections. The remaining tasks to be accomplished before a complete FRC formation, translation, and compression experiment can be performed are also outlined at the end. C1 [Grabowski, Chris; Degnan, James; Babineau, Mark; Camacho, Frank; Coffey, Sean; Coulter, Gordon; Domonkos, Matt; Gale, Don; Martinez, Bernard; Parker, Jerry; Rarph, Dale; Ruden, Ed; Sommars, Wayne] USAF, Res Lab, Directed Energy Directorate, 3550 Aberdeen Ave SE, Kirtland AFB, NM 87117 USA. [Hsu, Scott; Intrator, Tom; Renneke, Richard; Sieck, Paul; Waganaar, Birr; Wurden, Glen] Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Grabowski, C (reprint author), USAF, Res Lab, Directed Energy Directorate, 3550 Aberdeen Ave SE, Kirtland AFB, NM 87117 USA. EM theodore.grabowski@kirtland.af.mil RI Wurden, Glen/A-1921-2017; OI Wurden, Glen/0000-0003-2991-1484; Hsu, Scott/0000-0002-6737-4934 FU US Dept of Energy Office of Fusion Energy Studies [FA9451-05-D-0004] FX Work supported by the US Dept of Energy Office of Fusion Energy Studies under contract number FA9451-05-D-0004 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 BN 978-1-4244-0913-6 PY 2007 BP 1728 EP + DI 10.1109/PPPS.2007.4652525 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300393 ER PT B AU Haill, TA Mehhorn, TA AF Haill, T. A. Mehhorn, T. A. GP IEEE TI A feasibility study for a fragment-producing chemical-electrical launcher SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis AB The Fragment-Producing Chemical-Electrical Launcher (FP-CEL) project investigated the use of explosively driven magnetic loading techniques to launch controlled fragments in a predictable manner. A conventional fragmenting warhead uses high-explosive detonation products to throw fragments directly for various applications; however, greater control is desired to enhance kinetic-energy lethality mechanisms, and to lower collateral effects associated with storage and usage. To establish the feasibility of such an FP-CEL system, we conducted small-scale experiments using a capacitor-driven ramp-wave generator to accelerate flyers and fragments to velocities of 2 to 3 km/s, and analyzed the data with a multi-dimensional magneto-hydrodynamic computer code. An FP-CEL uses an explosive first stage, that is a flux-compression generator (or FCG), that would have similar electrical output to the capacitor-based approach. Such a two-stage system would have a significantly reduced total efficiency, therefore, in addition to overall feasibility, the present effort examined issues of system efficiency, as well as how to scale to operational capabilities. The work emphasized the study of the basic physics of the launching phenomena, while considering existing FCG technology as a prime power source. C1 [Haill, T. A.; Mehhorn, T. A.] Sandia Natl Labs, Pulsed Power Sci Ctr, Albuquerque, NM 87185 USA. RP Haill, TA (reprint author), Sandia Natl Labs, Pulsed Power Sci Ctr, POB 5800, Albuquerque, NM 87185 USA. 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 BN 978-1-4244-0913-6 PY 2007 BP 1753 EP 1756 DI 10.1109/PPPS.2007.4652530 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300398 ER PT B AU Campbell, RB Welch, DR Mehlhorn, TA AF Campbell, R. B. Welch, D. R. Mehlhorn, T. A. GP IEEE TI Integrated implicit particle-in-cell (PIC) simulations of petawatt laser heating of compressed cores for fast ignition SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis ID DENSITY AB There has been much interest in the fast heating of compressed matter by short pulse petawatt lasers [1]. Some time ago, we studied the heating process as applied to the GEKKO/PW experiments at Osaka [2] with a 3D hybrid electromagnetic implicit PIC code [3]. One limitation of our analysis was that we legislated the distribution of hot electrons entering the high density region. While the ansantz for the hot electron energy and angular distribution was consistent with experimental data, it clearly lacked rigor. We have now removed that limitation and will present integrated simulations which include the self-consistent laser plasma interaction with the blowoff plasma, as well as the electron transport through the pedestal and deposition in the core. For GEKKO/PW and FIREX [4] phase I scale experiments, the scaling of core temperature with increasing laser energy is nearly linear, and does not appear to have any saturation up to the highest we have considered, a laser energy of 2kJ The heating profiles in the core show localized heating on the density gradient. Higher laser intensity does create higher energy electrons in the simulations, in agreement with ponderomotive scaling, but this higher mean energy does not appear to directly impact the location of the heating zone at the core edge. From the integrated results of these simulations, a method for igniting a half-moon shaped shell of material and subsequently the entire core is suggested. C1 [Campbell, R. B.; Welch, D. R.; Mehlhorn, T. A.] Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Campbell, RB (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. NR 6 TC 0 Z9 0 U1 0 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0913-6 PY 2007 BP 1757 EP 1760 DI 10.1109/PPPS.2007.4652531 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300399 ER PT B AU Kalinin, Y Anan'ev, S Bakshaev, Y Bartov, A Blinov, P Bryzgunov, V Chernenko, A Danko, S Kazakov, E Kingsep, A Korolev, V Mizhiritsky, V Smirnov, V Tkachenko, S Mazarakis, M Olson, C AF Kalinin, Yu. Anan'ev, S. Bakshaev, Yu. Bartov, A. Blinov, P. Bryzgunov, V. Chernenko, A. Danko, S. Kazakov, E. Kingsep, A. Korolev, V. Mizhiritsky, V. Smirnov, V. Tkachenko, S. Mazarakis, M. Olson, C. GP IEEE TI Experimental modeling on the recyclable magnetically insulated transporting lines aimed at the ife reactor SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis AB At the Kurchatov Institute, the series of IFE experiments is carried out on the S-300 high-current generator (3 MA, 100 ns, 0.15 Ohm). In this talk, the experimental results on the S-300 machine are presented, related to the study of operation of co-axial magnetically self-insulated transporting line, by the linear current flow density on the inner electrode surface up to j approximate to 7 MA/cm. The specific parameters of this current-carrying line fairly correspond to those of the Sandia Laboratories' conceptual project of IFE reactor based on the fast Z-pinch [1]. The near-electrode plasma dynamics and its effect on the current transport were studied. The cathode material effect, as well as that of gases and oil layer absorbed by its surface, on the near-electrode plasma dynamics and the current pulse transport along the short MITL segment ware studied too. With respect to the whole project, our conclusion is quite optimistic, to wit, we have found the idea of Recyclable Transporting Lines being adequate to the IFE reactor requirements. C1 [Kalinin, Yu.; Anan'ev, S.; Bakshaev, Yu.; Bartov, A.; Blinov, P.; Bryzgunov, V.; Chernenko, A.; Danko, S.; Kazakov, E.; Kingsep, A.; Korolev, V.; Mizhiritsky, V.; Smirnov, V.] IV Kurchatov Atom Energy Inst, Russian Res Ctr, Moscow 123182, Russia. [Tkachenko, S.] Inst High Energy Densities, Moscow 125412, Russia. [Mazarakis, M.; Olson, C.] Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Kalinin, Y (reprint author), IV Kurchatov Atom Energy Inst, Russian Res Ctr, Moscow 123182, Russia. EM kalinin@dap.kiae.ru RI Tkachenko, Svetlana/L-2222-2013 OI Tkachenko, Svetlana/0000-0003-1480-9073 FU Sandia National Laboratories Kurchatov Institute [449961, 590728]; RFBR [05-02-17339]; Russia President's grant Scientific school [NSh-5819.2006.2] FX Work supported in part by contracts 449961 & 590728 Sandia National Laboratories Kurchatov Institute, by the RFBR grant 05-02-17339, and by the Russia Presidents grant Scientific school NSh-5819.2006.2. 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 BN 978-1-4244-0913-6 PY 2007 BP 1765 EP + DI 10.1109/PPPS.2007.4652533 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300401 ER PT B AU Tierney, TE Tierney, HE Watt, RG Idzorek, GC Peterson, RR Peterson, DL Lopez, MR Jones, M AF Tierney, T. E. Tierney, H. E. Watt, R. G. Idzorek, G. C. Peterson, R. R. Peterson, D. L. Lopez, M. R. Jones, M. GP IEEE TI Blast wave experments at SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis ID SANDIA-NATIONAL-LABORATORIES; RADIATION AB Blast waves (BWs) form when the wave speed of an initially diffusive, supersonic radiation wave becomes subsonic and creates a radiographically-visible, hydrodynamic shock wave. BWs are a novel diagnostic in radiation-flow, code validation experiments that use Sandia's Z-accelerator's dynamic hohlraum (DH) as a radiative source. The physics models being tested are sensitive to delivered energy and power changes of better than +/- 10%; therefore, precise in-situ radiative power and energy measurements are required for quantitative comparisons between simulation and experiment. The energy sensitive BW diagnostic complements bolometric and x-ray radiometric diagnostics in providing these measurements. Recent comparisons between BW qualification experiments and simulations have revealed a spatial dependence on the radiation source. We discuss the experimental design and sensitivities for the BW diagnostic and experimental results in comparison to simulations and other diagnostics. C1 [Tierney, T. E.; Tierney, H. E.; Watt, R. G.; Idzorek, G. C.; Peterson, R. R.; Peterson, D. L.] Los Alamos Natl Lab, POB 1663,Mail Stop D410, Los Alamos, NM 87545 USA. RP Tierney, TE (reprint author), Los Alamos Natl Lab, POB 1663,Mail Stop D410, Los Alamos, NM 87545 USA. FU US Dept of Energy under the auspices of Los Alamos National Security; Los Alamos National Laboratory [DE-AC52-06NA25396] FX This work was performed for the US Dept of Energy under the auspices of Los Alamos National Security, LLC.operator of Los Alamos National Laboratory under contract number DE-AC52-06NA25396. 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 BN 978-1-4244-0913-6 PY 2007 BP 1769 EP + DI 10.1109/PPPS.2007.4652534 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300402 ER PT B AU Commisso, RJ Apruzese, JP Mosher, D Murphy, DP Weber, BV Banister, JW Failor, BH Levine, JS Qi, N Sze, HM Bixler, A Coleman, PL Jarema, A Knight, J Lee, S Krishnan, M Thompson, J Wilson, K AF Commisso, R. J. Apruzese, J. P. Mosher, D. Murphy, D. P. Weber, B. V. Banister, J. W. Failor, B. H. Levine, J. S. Qi, N. Sze, H. M. Bixler, A. Coleman, P. L. Jarema, A. Knight, J. Lee, S. Krishnan, M. Thompson, J. Wilson, K. GP IEEE TI Energetics of a long-emplosion-time, 12-cm-diameter argon-gas-puff z pinch at 6.5 MA SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis ID K-SHELL RADIATION; DISTRIBUTIONS; IMPLOSIONS; EMISSION; ALUMINUM; VELOCITY; DENSITY; PLASMAS; NOZZLE; NS AB We carry out an energy-inventory analysis for a 12-cm-diameter, argon gas-puff shot on the Saturn generator. From the measured pinch inductance time history, we infer the average radius of the pinch current, rind, and the total work done on the pinch, E-coupled, both as functions of time. The kinetic energy as a function of time, EKE, is inferred from r(ind) and the measured initial mass distribution, assuming all of the mass is accreted as in a snowplow. The results show that early in the implosion, Ecoupled approximate to E-KE. However, when the pinch begins to radiate significantly, EKE begins to decrease while E-coupled continues to increase. The increase in coupled energy goes into plasma internal energy, E-int, i.e., ionization and thermal energies of the z-pinch plasma, and total radiation, E-rad. During the time of K-shell emission, the significant (similar to 150-kJ) increase in E-coupled is reflected in approximately the same increase in E-rad. There is agreement between E-int at the time of peak K-shell emission inferred from E-coupled and measurements of E-rad, and E-int inferred from independent spectroscopic measurements combined with an atomic-physics model. C1 [Commisso, R. J.; Apruzese, J. P.; Mosher, D.; Murphy, D. P.; Weber, B. V.] USN, Res Lab, Div Plasma Phys, Washington, DC 20375 USA. [Banister, J. W.; Failor, B. H.; Levine, J. S.; Qi, N.; Sze, H. M.] Pulse Sci Div, L 3 Commun, San Leandro, CA 94577 USA. [Bixler, A.; Coleman, P. L.; Jarema, A.; Knight, J.; Lee, S.; Krishnan, M.; Thompson, J.; Wilson, K.] Alameda Appl Sci Corp, San Leandro, CA 94577 USA. Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Commisso, RJ (reprint author), USN, Res Lab, Div Plasma Phys, Washington, DC 20375 USA. EM robert.commisso@nrl.navy.mil FU Defense treat Reduction Agency FX Work supported by the Defense treat Reduction Agency NR 38 TC 0 Z9 0 U1 0 U2 3 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0913-6 PY 2007 BP 1773 EP + DI 10.1109/PPPS.2007.4652535 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300403 ER PT B AU Shevelko, AP Bliss, DE Mazarakis, MG McGurn, JS Struve, KW Kazakov, ED Tolstikhina, IY Weeks, T AF Shevelko, A. P. Bliss, D. E. Mazarakis, M. G. McGurn, J. S. Struve, K. W. Kazakov, E. D. Tolstikhina, I. Y. Weeks, T. GP IEEE TI Euv spectroscopy of low-temperature plasmas created in the final anode-cathode gap of the Z-machine SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis ID X-RAY SPECTROSCOPY AB The effect of a short circuit across the final anode-cathode (A-K) gap of the powerful Z-Accelerator could hamper effective power delivery to z-pinch plasmas. The objective of this work is to develop an extreme ultraviolet (EUV) diagnostic technique for diagnosis of the low-temperature plasmas created in the final transmission line (A-K gap near the load) of the Z-Accelerator at the Sandia National Laboratories (SNL). The purpose of this effort is to help in understanding and mitigating this potentially serious problem. This work includes developing EUV grazing incidence spectrometers, investigation of the EUV spectra of highly charged ions in well diagnosed laser-produced plasmas, and the comparison of these laser plasma spectra with the spectra of plasmas created in the inner transmission tine. Spectra of highly-charged iron (Fe) ions were investigated using EUV spectroscopy methods in a spectral range of 2 to 80 nm. Experiments at SNL have shown that the most stripped ion observed in the spectra is FeXVII. Comparison of the experimental spectra of FeIII through FeXVII ions with theoretical calculations gives an electron temperature T-e of similar to 200 eV. C1 [Shevelko, A. P.; Kazakov, E. D.; Tolstikhina, I. Y.] RAS, PN Lebedev Phys Inst, Moscow 119991, Russia. [Bliss, D. E.; Mazarakis, M. G.; McGurn, J. S.; Struve, K. W.] Sandia Natl Labs, Albuquerque, NM 87185 USA. [Tolstikhina, I. Y.; Weeks, T.] Brigham Young Univ, Provo, UT 84602 USA. RP Shevelko, AP (reprint author), RAS, PN Lebedev Phys Inst, Moscow 119991, Russia. EM kwstruv@sandia.gov RI Tolstikhina, Inga/L-3576-2013; Kazakov, Evgeny/A-8314-2014; Shevelko, Alexander/N-1599-2015 NR 9 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0913-6 PY 2007 BP 1780 EP + DI 10.1109/PPPS.2007.4652536 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300404 ER PT B AU Kaye, R Turman, B Aubuchon, M Lamppa, D Mann, G van Reuth, E Fulton, K Malejko, G Magnotti, P Nguyen, D Borgwarth, D Johnson, A Poppe, R AF Kaye, R. Turman, B. Aubuchon, M. Lamppa, D. Mann, G. van Reuth, Edward Fulton, K. Malejko, G. Magnotti, P. Nguyen, D. Borgwarth, D. Johnson, A. Poppe, R. GP IEEE TI Induction coilgun for EM Mortar SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis AB The Defense Advanced Research Projects Agency is investigating electromagnetic (EM) guns for the next generation combat vehicle providing improved performance and survivability without the use of propellant. The two-year program was initiated in 2005 to design a coilgun and a railgun to launch an existing mortar round with an EM armature in laboratory conditions at speeds to increase range beyond current capabilities. This paper describes a laboratory coilgun system whose requirements are based on the Future Combat System Mortar Vehicle for indirect fire applications. Minimal adaptation has been necessary to existing mortar rounds with the armature and support structure necessary for EM coilgun launch. High magnetic field coils have been designed and tested at stress levels anticipated during launch. Recoil from the barrel of stacked coils will be managed by a conventional gun mount integrated to a catcher through a structural frame. Capacitor bank modules currently in fabrication and test utilize 1980's technology capacitors, but new ideas in commercial components for switches, resistors and bus-work are investigated to lower cost. The firing system, which includes a projectile-sensing 94 GHz radar triggers the capacitor banks for optimal performance and precise muzzle velocity control, is also described. C1 [Kaye, R.; Turman, B.; Aubuchon, M.; Lamppa, D.; Mann, G.] Sandia Natl Labs, POB 5800,Mail Stop 1182, Albuquerque, NM 87185 USA. [Fulton, K.; Malejko, G.; Magnotti, P.; Nguyen, D.] US Army, Dev & Engn Ctr Picatinny Arsenal, Armament Res, Arlington, VA USA. [Borgwarth, D.; Johnson, A.; Poppe, R.] Armament Syst, BAE Syst Inc, Minneapolis, MN USA. RP Kaye, R (reprint author), Sandia Natl Labs, POB 5800,Mail Stop 1182, Albuquerque, NM 87185 USA. EM kaye@sandia.gov NR 1 TC 0 Z9 1 U1 0 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0913-6 PY 2007 BP 1810 EP + DI 10.1109/PPPS.2007.4652542 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300410 ER PT B AU Sanders, D Cook, E Anaya, R Wang, L Sampayan, S Caporaso, G Slenes, K Jacquin, J De La Fuente, R AF Sanders, Dave Cook, Ed Anaya, Rick Wang, Lisa Sampayan, Steve Caporaso, George Slenes, Kirk Jacquin, Jeff De La Fuente, Rafael GP IEEE TI Breakdown performance statistics of a nanoparticle composite system SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis AB The Dielectric Wall Accelerator (DWA) is an approach for manufacturing particle accelerators that can be an order of magnitude more compact than conventional accelerators. To realize the associated high level of electric field gradient it is necessary to develop and characterize materials that can maintain electric fields in excess of 100 MW/m (=1MW/cm). This high value for the breakdown strength must be maintained for many thousands of pulses under conditions of voltage reversal. The present work reports the performance of a candidate composite material composed of high dielectric constant nanoparticles dispersed in an epoxy matrix loaded to achieve a dielectric constant 10. The effect of peak voltage on number of pulses that can be sustained is given. In addition the effects of electrode gap spacing and charging rate are explored. C1 [Sanders, Dave; Cook, Ed; Anaya, Rick; Wang, Lisa; Sampayan, Steve; Caporaso, George] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Sanders, D (reprint author), Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. 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 BN 978-1-4244-0913-6 PY 2007 BP 1826 EP 1830 DI 10.1109/PPPS.2007.4652546 PG 5 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300414 ER PT B AU Javedani, JB Goerz, DA Houck, TL Lauer, EJ Speer, RD Tully, LK Vogtlin, GE AF Javedani, J. B. Goerz, D. A. Houck, T. L. Lauer, E. J. Speer, R. D. Tully, L. K. Vogtlin, G. E. GP IEEE TI Understanding high voltage vacuum insulators for microsecond pulses SO 2007 IEEE PULSED POWER CONFERENCE, VOLS 1-4 LA English DT Proceedings Paper CT 16th IEEE International Pulsed Power Conference CY JUN 17-22, 2007 CL Albuquerque, NM SP IEEE, Sandia Natl Labs, Natl Secur Technologies, ICAR, Gen Atom Fus Energy Res, Ktech Corp, Gen Atom Elect Syst, HVR, Lawrence Livermore Natl Lab, Los Alamos Natl Lab, Tera Anal Ltd, Tech X, Ultravolt, Major Tool & Machine, Voss Sci, BAE Syst, Saft, Diversified Technologies Inc, ABB, Axsys Technologies, Agilent Technologies, Appl Technologies Pulse Sci, TSP, Pulse Power Solut, LLC, e2v, Barth Elect Inc, Novacap, Lambda, Powerex, Strangenes Ind Inc, SBE, HV Component Associates, Field Precis AB High voltage insulation is one of the main areas of pulsed power research and development since the surface of an insulator exposed to vacuum can fail electrically at an applied field more than an order or magnitude below the bulk dielectric strength of the insulator. This is troublesome for applications where high voltage conditioning of the insulator and electrodes is not practical and where relatively long pulses, on the order of several microseconds, are required. Here we give a summary of our approach to modeling and simulation efforts and experimental investigations for understanding flashover mechanism. The computational work is comprised of both filed and particle-in-cell modeling with state-of-the-art commercial codes. Experiments were performed in using an available 100-kV, 10-mu s pulse generator and vacuum chamber. The initial experiments were done with polyethylene insulator material in the shape of a truncated cone cut at +45 degrees angle between flat electrodes with a gap of 1.0 cm. The insulator was sized so there were no flashovers or breakdowns under nominal operating conditions. Insulator flashover or gap closure was induced by introducing a plasma source, a tuft of velvet, in proximity to the insulator or electrode. C1 [Javedani, J. B.; Goerz, D. A.; Houck, T. L.; Lauer, E. J.; Speer, R. D.; Tully, L. K.; Vogtlin, G. E.] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Javedani, JB (reprint author), Lawrence Livermore Natl Lab, L-154,7000 East Ave, Livermore, CA 94550 USA. 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 BN 978-1-4244-0913-6 PY 2007 BP 1836 EP 1839 DI 10.1109/PPPS.2007.4652548 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear SC Engineering; Physics GA BHJ74 UT WOS:000253619300416 ER PT B AU Molino, V Madhavan, R Messina, E Downs, A Balakirsky, S Jacoff, A AF Molino, V. Madhavan, R. Messina, E. Downs, A. Balakirsky, S. Jacoff, A. GP IEEE TI Traversability metrics for rough terrain applied to repeatable test methods SO 2007 IEEE/RSJ INTERNATIONAL CONFERENCE ON INTELLIGENT ROBOTS AND SYSTEMS, VOLS 1-9 LA English DT Proceedings Paper CT IEEE/RSJ International Conference on Intelligent Robots and Systems CY OCT 29-NOV 02, 2007 CL San Diego, CA SP IEEE, RSJ AB Rough terrain, such as the rubble that one would expect to find in urban disaster areas, poses a severe impediment to robot mobility. The goal of this paper(1) is to develop methods for quantifying the difficulty a robot would encounter traversing such a region of rough terrain. Towards this, three traversability metrics describing rough terrain robot mobility are developed. In order to simplify the problem, we assume that the rough terrain in question can be discretized in a certain manner and then develop the metrics for this discretized version of the terrain. Two of the developed metrics reflect the difficulty a robot would have trying to move over the entire region of terrain (referred to as coverability). The third metric, referred to as crossability, describes the difficulty a robot would encounter attempting to move from some fixed point on the terrain to some other fixed point. We verify the applicability of the developed metrics using NIST-developed repeatable test methods (step fields) and discuss the validity of the obtained results. C1 [Molino, V.; Madhavan, R.; Messina, E.; Downs, A.; Balakirsky, S.; Jacoff, A.] Oak Ridge Natl Lab, Computat Sci & Engn Div, Oak Ridge, TN 37831 USA. RP Madhavan, R (reprint author), Oak Ridge Natl Lab, Computat Sci & Engn Div, Oak Ridge, TN 37831 USA. EM raj.madhavan@nist.gov 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 BN 978-1-4244-0912-9 PY 2007 BP 1793 EP + PG 2 WC Automation & Control Systems; Computer Science, Artificial Intelligence; Engineering, Manufacturing; Engineering, Electrical & Electronic; Robotics SC Automation & Control Systems; Computer Science; Engineering; Robotics GA BHL44 UT WOS:000254073201060 ER PT B AU Paxson, V Sommer, R Weaver, N AF Paxson, Vern Sommer, Robin Weaver, Nicholas GP IEEE TI An architecture for exploiting multi-core processors to parallelize network intrusion prevention SO 2007 IEEE SARNOFF SYMPOSIUM SE IEEE Sarnoff Symposium LA English DT Proceedings Paper CT IEEE Sarnoff Symposium CY APR 30-MAY 02, 2007 CL Princeton, NJ SP IEEE AB It is becoming increasingly difficult to implement effective systems for preventing network attacks, due to the combination of (1) the rising sophistication of attacks requiring more complex analysis to detect, (2) the relentless growth in the volume of network traffic that we must analyze, and, critically, (3) the failure in recent years for uniprocessor performance to sustain the exponential gains that for so many years CPUs enjoyed ("Moore's Law"). For commodity hardware, tomorrow's performance gains will instead come from multicore architectures in which a whole set of CPUs executes concurrently. Taking advantage of the full power of multi-core processors for network intrusion prevention requires an in-depth approach. In this work we frame an architecture customized,for parallel execution of network attack analysis. At the lowest layer of the architecture is an "Active Network Inteface" (ANI), a custom device based on an inexpensive FPGA platform. The ANI provides the in-line interface to the network, reading in packets and forwarding them after they are approved. It also serves as the front-end for dispatching copies of the packets to a set of analysis threads. The analysis itself is structured as an event-based system, which allows us to find many opportunities for concurrent execution, since events introduce a natural, decoupled asynchrony into the flow of analysis while still maintaining good cache locality. Finally, by associating events with the packets that ultimately stimulated them, we can determine when all analysis for a given packet has completed, and thus that it is safe to forward the pending packet-providing none of the analysis elements previously signaled that the packet should instead be discarded. C1 [Paxson, Vern; Sommer, Robin] Univ Calif Berkeley, Lawrence Berkeley Lab, Int Comp Sci Inst, Berkeley, CA 94720 USA. RP Paxson, V (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Int Comp Sci Inst, Berkeley, CA 94720 USA. EM vern@icir.org; robin@icir.org 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 BN 978-1-4244-2483-2 J9 IEEE SARNOFF SYMPOS PY 2007 BP 514 EP 520 PG 7 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA BIG59 UT WOS:000259363000099 ER PT S AU Datar, R Passian, A Desikan, R Thundat, T AF Datar, R. Passian, A. Desikan, R. Thundat, T. GP IEEE TI Microcantilever biosennsors SO 2007 IEEE SENSORS, VOLS 1-3 SE IEEE Sensors LA English DT Proceedings Paper CT 6th IEEE Sensors Conference CY OCT 28-31, 2007 CL Atlanta, GA SP IEEE Sensors Council AB Microcantilever arrays have been used for multiplexed, label-free detection of biomolecules. Adsorption of analyte molecules on immobilized receptors on the cantilevers result in cantilever bending due to surface free energy variation. Piezoresistive readout of cantilever bending offers a simple method of signal transduction that is compatible with microfabrication. Although the microcantilever-based biosensing appears to high sensitivity and selectivity, reproducibility of the technique appears to be a challenge. We have developed a novel method of immobilizing receptors that increases the reproducibility. We have demonstrated simultaneous detection of cancer and cardiac markers using cantilever arrays with immobilized receptors. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Datar, R (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. EM thundattg@ornl.gov NR 1 TC 0 Z9 0 U1 0 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1930-0395 BN 978-1-4244-1261-7 J9 IEEE SENSOR PY 2007 BP 5 EP 5 DI 10.1109/ICSENS.2007.4388320 PG 1 WC Computer Science, Artificial Intelligence; Engineering, Electrical & Electronic; Remote Sensing; Optics SC Computer Science; Engineering; Remote Sensing; Optics GA BHN71 UT WOS:000254563600376 ER PT S AU Frank, M Farquar, G Adams, K Bogan, M Martin, A Benner, H Spadaccini, C Steele, P AF Frank, Matthias Farquar, George Adams, Kristl Bogan, Michael Martin, Audrey Benner, Henry Spadaccini, Christopher Steele, Paul GP IEEE TI Modular sampling and analysis techniques for the real-time analysis of human breath SO 2007 IEEE SENSORS, VOLS 1-3 SE IEEE Sensors LA English DT Proceedings Paper CT 6th IEEE Sensors Conference CY OCT 28-31, 2007 CL Atlanta, GA SP IEEE Sensors Council ID BIOAEROSOL MASS-SPECTROMETRY; MYCOBACTERIA; PREDICTION; PARTICLES; AIR AB At LLNL and UC Davis, we are developing several techniques for the real-time sampling and analysis of trace gases, aerosols and exhaled breath that could be useful for a modular, integrated system for breath analysis. Those techniques include single-particle bioaerosol mass spectrometry (BAMS) for the analysis of exhaled aerosol particles or droplets as well as breath samplers integrated with gas chromatography mass spectrometry (GC-MS) or MEMS-based differential mobility spectrometry (DMS). We describe these techniques and present recent data obtained from human breath or breath condensate, in particular, addressing the question of how environmental exposure influences the composition of breath. C1 [Frank, Matthias; Farquar, George; Adams, Kristl; Bogan, Michael; Martin, Audrey; Benner, Henry; Spadaccini, Christopher; Steele, Paul] Lawrence Livermore Natl Lab, Phys Directorate, 7000 E Ave,L-211, Livermore, CA 94551 USA. RP Frank, M (reprint author), Lawrence Livermore Natl Lab, Phys Directorate, 7000 E Ave,L-211, Livermore, CA 94551 USA. EM frank1@llnl.gov RI Frank, Matthias/O-9055-2014; OI Bogan, Michael J./0000-0001-9318-3333 FU U.S. Department of Energy by University of California Lawrence Livermore National Laboratory (LLNL) [W-7405-ENG-48]; LLNL through Laboratory Directed Research and Development (LDRD) [05-ERD-053]; DARPA/MTO seedling project FX This work was performed under the auspices of the U.S. Department of Energy by University of California Lawrence Livermore National Laboratory (LLNL) under contract W-7405-ENG-48 and supported by LLNL through Laboratory Directed Research and Development (LDRD) grant no. 05-ERD-053 and by a DARPA/MTO seedling project (PM Dennis Polla). NR 15 TC 0 Z9 0 U1 0 U2 4 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1930-0395 BN 978-1-4244-1261-7 J9 IEEE SENSOR PY 2007 BP 10 EP 13 DI 10.1109/ICSENS.2007.4388322 PG 4 WC Computer Science, Artificial Intelligence; Engineering, Electrical & Electronic; Remote Sensing; Optics SC Computer Science; Engineering; Remote Sensing; Optics GA BHN71 UT WOS:000254563600005 ER PT S AU Wenzel, MJ Josse, F Yaz, E Heinrich, SM Datskos, PG AF Wenzel, M. J. Josse, F. Yaz, E. Heinrich, S. M. Datskos, P. G. GP IEEE TI Rapid detection of analytes with improved selectivity using coated microcantilever chemical sensors and estimation theory SO 2007 IEEE SENSORS, VOLS 1-3 SE IEEE Sensors LA English DT Proceedings Paper CT 6th IEEE Sensors Conference CY OCT 28-31, 2007 CL Atlanta, GA SP IEEE Sensors Council ID ARRAYS AB Rapid detection of analytes with improved selectivity is achieved though the use of estimation theory to analyze the response of polymer-coated microcantilever chemical sensors. In general, chemical sensors exhibit partial selectivity and can have relatively long response times. Using estimation theory, it is possible to make short-term response predictions from past data. This makes it possible to use the transient information (response time), often unique to an analyte/coating pair, to achieve an improvement in analyte species recognition while simultaneously allowing for a reduction in the time required for identification and quantification. An extended Kalman filter is used as a recursive online approach to refine the estimate of the sensor's future response. Both identification and quantification are thus possible as soon as the filter estimate achieves a high confidence level. Also, with improved selectivity, identification is possible using fewer sensors in an array. C1 [Wenzel, M. J.; Josse, F.; Yaz, E.; Heinrich, S. M.] Marquette Univ, Milwaukee, WI 53233 USA. [Datskos, P. G.] Oak Ridge Natl Lab, Oak Ridge, TN USA. RP Wenzel, MJ (reprint author), Marquette Univ, Milwaukee, WI 53233 USA. EM fabienjosse@marquette.edu NR 11 TC 2 Z9 2 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1930-0395 BN 978-1-4244-1261-7 J9 IEEE SENSOR PY 2007 BP 91 EP 94 DI 10.1109/ICSENS.2007.4388343 PG 4 WC Computer Science, Artificial Intelligence; Engineering, Electrical & Electronic; Remote Sensing; Optics SC Computer Science; Engineering; Remote Sensing; Optics GA BHN71 UT WOS:000254563600025 ER PT S AU Cole, GD Kotovsky, J Lin, KL Petersen, HE AF Cole, Garrett D. Kotovsky, Jack Lin, Kevin L. Petersen, Holly E. GP IEEE TI Microfabricated optical compressive load sensors SO 2007 IEEE SENSORS, VOLS 1-3 SE IEEE Sensors LA English DT Proceedings Paper CT 6th IEEE Sensors Conference CY OCT 28-31, 2007 CL Atlanta, GA SP IEEE Sensors Council ID FIBER BRAGG GRATINGS; INDEX MODULATION AB We demonstrate novel optically-addressable compressive load sensors consisting of bulk micromachined single-crystal silicon transducers integrated with fiber Bragg grating (FBG) sensing elements. These devices constitute a new class of compact optical sensors realized through the integration of mechanical components constructed via microelectromechanical systems (MEMS) fabrication technologies and strain sensitive elements based on FBGs. In this work we present experimental results for an "optical force probe" (OFP) capable of sensing compressive loading transverse to the long-axis of the fiber. Given the transduction mechanism in our design-whereby a compressive load is converted to an axial strain in the fiber-it is possible to use a standard FBG readout system to measure the imparted load. Furthermore, the sensitivity is tunable for any desired load range. Results are presented for compressive loads up to 200 psi, resulting in axial strains approaching 1000 mu epsilon in the fiber. C1 [Cole, Garrett D.; Kotovsky, Jack; Lin, Kevin L.; Petersen, Holly E.] Lawrence Livermore Natl Lab, Ctr Micro & Nanotechnol, Livermore, CA 94550 USA. RP Cole, GD (reprint author), Lawrence Livermore Natl Lab, Ctr Micro & Nanotechnol, Livermore, CA 94550 USA. EM cole35@llnl.gov RI Cole, Garrett/B-9383-2011 NR 6 TC 0 Z9 0 U1 0 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1930-0395 BN 978-1-4244-1261-7 J9 IEEE SENSOR PY 2007 BP 446 EP 449 DI 10.1109/ICSENS.2007.4388432 PG 4 WC Computer Science, Artificial Intelligence; Engineering, Electrical & Electronic; Remote Sensing; Optics SC Computer Science; Engineering; Remote Sensing; Optics GA BHN71 UT WOS:000254563600114 ER PT S AU Weeks, ML Frymier, PD Rahman, T Islam, SK McKnight, TE AF Weeks, Martha L. Frymier, Paul D. Rahman, Touhidur Islam, Syed K. McKnight, Timothy E. GP IEEE TI Detection of alcohol with Vertically Aligned Carbon Nanofiber (VACNF) SO 2007 IEEE SENSORS, VOLS 1-3 SE IEEE Sensors LA English DT Proceedings Paper CT 6th IEEE Sensors Conference CY OCT 28-31, 2007 CL Atlanta, GA SP IEEE Sensors Council ID NANOTUBES AB A reagentless amperometric enzymatic biosensor is constructed using Vertically Aligned Carbon Nanofiber (VACNF) for the detection of alcohol. Yeast alcohol dehydrogenase (YADH), and its cofactor nicotinamide adenine dinuleotide (NAD(+)) are immobilized by covalent attachment and adsorption to the carbon substrate. Electrochemical techniques are employed to test the function and performance of the constructed biosensor. Characterization of the electrode is performed using NADH. Subsequently, amperometric measurements are conducted with the electrodes for the detection of ethanol to determine the response of the electrical current due to an increase in analyte concentration. The detection range, storage stability, reusability, and response time of the biosensor is also examined. C1 [Weeks, Martha L.; Frymier, Paul D.] Univ Tennessee, Dept Chem Engn, Knoxville, TN 37996 USA. [Rahman, Touhidur; Islam, Syed K.] Univ Tennessee, Dept Elect & Comp Engn, Knoxville, TN 37996 USA. [McKnight, Timothy E.] Oak Ridge Natl Lab, Mol Scale Engn & Nanoscale Technol Res Grp, Oak Ridge, TN 37831 USA. RP Weeks, ML (reprint author), Univ Tennessee, Dept Chem Engn, Knoxville, TN 37996 USA. RI McKnight, Tim/H-3087-2011 OI McKnight, Tim/0000-0003-4326-9117 NR 3 TC 0 Z9 0 U1 0 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1930-0395 BN 978-1-4244-1261-7 J9 IEEE SENSOR PY 2007 BP 675 EP 677 DI 10.1109/ICSENS.2007.4388489 PG 3 WC Computer Science, Artificial Intelligence; Engineering, Electrical & Electronic; Remote Sensing; Optics SC Computer Science; Engineering; Remote Sensing; Optics GA BHN71 UT WOS:000254563600171 ER PT S AU Jacquot, BC Munoz, NL Branch, DW Kan, EC AF Jacquot, Blake C. Munoz, N. L. Branch, D. W. Kan, E. C. GP IEEE TI Real-time protein binding detection with neuromorphic integrated sensor SO 2007 IEEE SENSORS, VOLS 1-3 SE IEEE Sensors LA English DT Proceedings Paper CT 6th IEEE Sensors Conference CY OCT 28-31, 2007 CL Atlanta, GA SP IEEE Sensors Council DE protein microarray; biosensor; FET; floating-gate; chemical sensor AB Real time protein binding interactions between biotinylated bovine serum albumen (BSA) and streptavidin (SA) are detected using chemoreceptive neuron MOS (CvMOS) transistors with extended floating gate structures. This enables protein interaction events to be monitored by a sensing gate area that is only capacitively coupled to the sensing circuits and far removed from the active area, reducing the invasiveness without loss of sensitivity. The use of both sensing and control gates to control the floating gate potential eliminates the need of an analyte reference electrode. C1 [Jacquot, Blake C.; Munoz, N. L.; Kan, E. C.] Cornell Univ, Sch Elect & Comp Engn, Ithaca, NY 14853 USA. [Branch, D. W.] Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Jacquot, BC (reprint author), Cornell Univ, Sch Elect & Comp Engn, Ithaca, NY 14853 USA. EM bcj7@cornell.edu FU Environmental Protection Agency (EPA); Sandia National Laboratories; NYSTAR FX This project is supported by the Environmental Protection Agency (EPA), Sandia National Laboratories and NYSTAR. NR 13 TC 0 Z9 0 U1 0 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1930-0395 BN 978-1-4244-1261-7 J9 IEEE SENSOR PY 2007 BP 678 EP 681 DI 10.1109/ICSENS.2007.4388490 PG 4 WC Computer Science, Artificial Intelligence; Engineering, Electrical & Electronic; Remote Sensing; Optics SC Computer Science; Engineering; Remote Sensing; Optics GA BHN71 UT WOS:000254563600172 ER PT S AU Thundat, T Brown, GM AF Thundat, T. Brown, Gilbert M. GP IEEE TI Electrochemical cantilever sensors and scanning probe microscopy SO 2007 IEEE SENSORS, VOLS 1-3 SE IEEE Sensors LA English DT Proceedings Paper CT 6th IEEE Sensors Conference CY OCT 28-31, 2007 CL Atlanta, GA SP IEEE Sensors Council AB Electrochemical microcantilever sensors in combination with scanning probe microscopy offer unique tool for solid-liquid interface characterization as well as localized chemical speciation of electro-active species. The resonance response can be used to probe the physical characteristics of the interface while electrochemically induced surface stress variation can be used for chemical speciation. Scanning the solid-liquid interface using a combined physical and electrochemical cantilever probe provides chemically functional images of surfaces and interfaces. C1 [Thundat, T.; Brown, Gilbert M.] Oak Ridge Natl Lab, Oak Ridge, TN USA. RP Thundat, T (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN USA. EM thundattg@ornl.gov 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 1930-0395 BN 978-1-4244-1261-7 J9 IEEE SENSOR PY 2007 BP 707 EP 707 DI 10.1109/ICSENS.2007.4388497 PG 1 WC Computer Science, Artificial Intelligence; Engineering, Electrical & Electronic; Remote Sensing; Optics SC Computer Science; Engineering; Remote Sensing; Optics GA BHN71 UT WOS:000254563600179 ER PT S AU Goddard, LL Bond, TC Cole, GD Behymer, EM AF Goddard, Lynford L. Bond, Tiziana C. Cole, Garrett D. Behymer, Elaine M. GP IEEE TI Functionalized lateral surface coated lasers for chem-bio detection SO 2007 IEEE SENSORS, VOLS 1-3 SE IEEE Sensors LA English DT Proceedings Paper CT 6th IEEE Sensors Conference CY OCT 28-31, 2007 CL Atlanta, GA SP IEEE Sensors Council ID THIN-FILM; PALLADIUM; SENSORS AB We present a class of compact, monolithic, photonic sensors consisting of multiple section edge emitting lasers with functionalized lateral surface coatings for low level detection of chemical or biological agents. Specifically, we discuss 8 mu m x 250 mu m Pd-coated H(2) sensors and configurations to reduce the minimum detection limit from 138ppm for passive sensors to 1ppm for active sensors. Compared with conventional optical H(2) sensors that use fiber gratings, surface plasmon resonances, or surface reflectance, our sensors offer the advantages of smaller size, wider dynamic range, monolithic integration of laser source and detector, and 2-D scalability to arrays of sensors that are functionalized to detect different agents. C1 [Goddard, Lynford L.; Bond, Tiziana C.; Cole, Garrett D.; Behymer, Elaine M.] Lawrence Livermore Natl Lab, Ctr Micro & Nano Technol, Livermore, CA USA. RP Goddard, LL (reprint author), Lawrence Livermore Natl Lab, Ctr Micro & Nano Technol, Livermore, CA USA. EM lgoddard@gmail.com RI Cole, Garrett/B-9383-2011 NR 11 TC 0 Z9 0 U1 0 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1930-0395 BN 978-1-4244-1261-7 J9 IEEE SENSOR PY 2007 BP 1181 EP 1184 DI 10.1109/ICSENS.2007.4388619 PG 4 WC Computer Science, Artificial Intelligence; Engineering, Electrical & Electronic; Remote Sensing; Optics SC Computer Science; Engineering; Remote Sensing; Optics GA BHN71 UT WOS:000254563600300 ER PT S AU Kim, SS Young, C Chan, J Carter, C Mizaikoff, B AF Kim, Seong-Soo Young, Christina Chan, James Carter, Chance Mizaikoff, Boris GP IEEE TI Hollow waveguide gas sensor for mid-infrared trace gas analysis SO 2007 IEEE SENSORS, VOLS 1-3 SE IEEE Sensors LA English DT Proceedings Paper CT 6th IEEE Sensors Conference CY OCT 28-31, 2007 CL Atlanta, GA SP IEEE Sensors Council ID QUANTUM CASCADE LASERS; CELLS; BAND AB A hollow waveguide mid-infrared gas sensor operating from 1000 cm(-1) to 4000 cm(-1) has been developed, optimized, and its performance characterized by combining a FT-IR spectrometer with Ag/Ag-halide hollow core optical fibers. The hollow core waveguide simultaneously serves as a light guide and miniature gas cell. CH4 was used as test analyte during exponential dilution experiments for accurate determination of the achievable limit of detection (LOD). It is shown that the optimized integration of an optical gas sensor module with FT-IR spectroscopy provides trace sensitivity at the few hundreds of parts-per-billion concentration range (ppb, v/v) for CH4. C1 [Kim, Seong-Soo; Young, Christina; Mizaikoff, Boris] Georgia Inst Technol, Sch Chem & Biochem, Atlanta, GA 30332 USA. [Chan, James; Carter, Chance] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Mizaikoff, B (reprint author), Georgia Inst Technol, Sch Chem & Biochem, Atlanta, GA 30332 USA. EM boris.mizaikoff@chemistry.gatech.edu RI Mizaikoff, Boris/G-9959-2013 OI Mizaikoff, Boris/0000-0002-5583-7962 FU U.S.Department of Energy; University of California,Lawrence Livermore National Laboratory [W-7405-Eng-48]; LLNL [B565491] FX This work was performed under the auspices of the U.S.Department of Energy by the University of California, Lawrence Livermore National Laboratory under contract No.W-7405-Eng-48. This project was funded by the Laboratory Directed Research and Development Program at LLNL under sub-contract No. B565491. NR 13 TC 1 Z9 1 U1 1 U2 5 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1930-0395 BN 978-1-4244-1261-7 J9 IEEE SENSOR PY 2007 BP 1267 EP 1270 DI 10.1109/ICSENS.2007.4388640 PG 4 WC Computer Science, Artificial Intelligence; Engineering, Electrical & Electronic; Remote Sensing; Optics SC Computer Science; Engineering; Remote Sensing; Optics GA BHN71 UT WOS:000254563600321 ER PT S AU Grate, JW Ozanich, R Hartman, JS O'Hara, MJ Egorov, OB AF Grate, Jay W. Ozanich, Richard Hartman, John S. O'Hara, Matthew J. Egorov, Oleg B. GP IEEE TI Preconcentrating minicolumn sensors for trace environmental monitoring SO 2007 IEEE SENSORS, VOLS 1-3 SE IEEE Sensors LA English DT Proceedings Paper CT 6th IEEE Sensors Conference CY OCT 28-31, 2007 CL Atlanta, GA SP IEEE Sensors Council ID WATER AB Preconcentrating minicolumn sensors represent an effective approach to achieve a substantial preconcentration factor within a sensing device, enabling very low detection limits as is required for environmental sensing. A selectively sorbent phase collects and concentrates analyte molecules as sample liquid is pumped through the column, ultimately equilibrating the entire sorbent phase with the analyte concentration in the sample. At equilibration, the amount on the column will be proportional to the analyte concentration when working at trace concentrations. We have demonstrated radiometric detection for the detection of radionuclides with this sensor, incorporating scintillating material in the column with the sorbent phase. The pertechnetate form of 99-technetium can be sensed using a mixed column bed containing anion exchange resin and scintillating plastic beads, collecting scintillation light with a pair of photomultiplier (PMT) tubes external to the transparent column body. For hexavalent chromium, we can also collect anions with anion exchange resin. In this case, optical fibers are coupled to the column body to measure the optical absorbance as a function of the amount of hexavalent chromium captured by the column. Both sensors can detect their respective analytes to levels below water standards. C1 [Grate, Jay W.; Ozanich, Richard; Hartman, John S.; O'Hara, Matthew J.] Pacific NW Natl Lab, POB 999, Richland, WA 99352 USA. [Egorov, Oleg B.] Isoray Med Inc, Richland, WA USA. RP Grate, JW (reprint author), Pacific NW Natl Lab, POB 999, Richland, WA 99352 USA. OI O'Hara, Matthew/0000-0003-3982-5897 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 1930-0395 BN 978-1-4244-1261-7 J9 IEEE SENSOR PY 2007 BP 1357 EP 1360 DI 10.1109/ICSENS.2007.4388663 PG 4 WC Computer Science, Artificial Intelligence; Engineering, Electrical & Electronic; Remote Sensing; Optics SC Computer Science; Engineering; Remote Sensing; Optics GA BHN71 UT WOS:000254563600344 ER PT S AU Bond, TC Cole, GD Goddard, LL Behymer, EM AF Bond, Tiziana C. Cole, Garrett D. Goddard, Lynford L. Behymer, Elaine M. GP IEEE TI Photonic MEMS for NIR in-situ gas detection and identification SO 2007 IEEE SENSORS, VOLS 1-3 SE IEEE Sensors LA English DT Proceedings Paper CT 6th IEEE Sensors Conference CY OCT 28-31, 2007 CL Atlanta, GA SP IEEE Sensors Council ID VERTICAL-CAVITY SOAS AB We report on a novel sensing technique combining photonics and microelectromechanical systems (MEMS) for the detection and monitoring of gas emissions in environmental, medical, and industrial applications. We discuss how MEMS-tunable vertical-cavity surface-emitting lasers (VCSEU) can be exploited for in-situ detection and NIR spectroscopy of several gases, such as O(2), N(2)O, CH(4), BF, HCl, etc., with estimated sensitivities between 0.1 and 20 ppm on footprints << 10(-3) mm(3). The VCSELs can be electrostatically tuned with a continuous wavelength shift up to 20 urn, allowing for unambiguous NIR signature determination. Selective concentration analysis in heterogeneous gas compositions is enabled, thus paving the way to an integrated optical platform for multiplexed gas identification by bandgap and device engineering. We will discuss here, in particular, our efforts on the development of a 760 urn AlGaAs-based tunable VCSEL for O(2) detection. C1 [Bond, Tiziana C.; Cole, Garrett D.; Goddard, Lynford L.; Behymer, Elaine M.] Lawrence Livermore Natl Lab, Meso Micro Nano Technol Ctr, Livermore, CA 94550 USA. RP Bond, TC (reprint author), Lawrence Livermore Natl Lab, Meso Micro Nano Technol Ctr, Livermore, CA 94550 USA. EM bond7@llnl.gov RI Cole, Garrett/B-9383-2011 NR 13 TC 3 Z9 3 U1 1 U2 3 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1930-0395 BN 978-1-4244-1261-7 J9 IEEE SENSOR PY 2007 BP 1368 EP 1371 DI 10.1109/ICSENS.2007.4388666 PG 4 WC Computer Science, Artificial Intelligence; Engineering, Electrical & Electronic; Remote Sensing; Optics SC Computer Science; Engineering; Remote Sensing; Optics GA BHN71 UT WOS:000254563600347 ER PT S AU Choudhury, A Hesketh, PJ Thundat, TG Hu, Z Vujanic, R AF Choudhury, Arnab Hesketh, Peter J. Thundat, Thomas G. Hu, Zhiyu Vujanic, Robin GP IEEE TI Design and testing of single and double sided cantilevers for chemical sensing SO 2007 IEEE SENSORS, VOLS 1-3 SE IEEE Sensors LA English DT Proceedings Paper CT 6th IEEE Sensors Conference CY OCT 28-31, 2007 CL Atlanta, GA SP IEEE Sensors Council AB Two approaches to surface stress-based chemical sensing with piezoresistive microcantilevers are compared. Miocantilever-based chemical sensing is usually performed by functionalizing a single surface of the cantilever (single-sided surface stress- SSS). Sensitive measurements can be made by functionalization of both surfaces of the cantilever (double-sided surface stress- DSS). Design issues related to the sensitivity of these measurement principles are discussed. Also, a low noise method of measuring cantilever resistance is used for evaluation of surface stress response. C1 [Choudhury, Arnab; Hesketh, Peter J.] Georgia Inst Technol, George W Woodruff Sch Mech Engn, Atlanta, GA 30332 USA. [Thundat, Thomas G.; Hu, Zhiyu] Oak Ridge Natl Lab, Div Life Sci, Oak Ridge, TN USA. RP Choudhury, A (reprint author), Georgia Inst Technol, George W Woodruff Sch Mech Engn, Atlanta, GA 30332 USA. EM peter.hesketh@me.gatech.edu; huzn@ornl.gov FU Oak Ridge National Laboratory; DOE offices of Biological and Environmental Research is gratefully acknowledged; [DE-AC05-00OR22725] FX Supported by the Oak Ridge National Laboratory, managed by UT- Battelle, LLC, for the U.S. Department of Energy, under contract DE- AC05-00OR22725. Support from the DOE offices of Biological and Environmental Research is gratefully acknowledged. NR 6 TC 0 Z9 0 U1 0 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1930-0395 BN 978-1-4244-1261-7 J9 IEEE SENSOR PY 2007 BP 1432 EP 1435 DI 10.1109/ICSENS.2007.4388682 PG 4 WC Computer Science, Artificial Intelligence; Engineering, Electrical & Electronic; Remote Sensing; Optics SC Computer Science; Engineering; Remote Sensing; Optics GA BHN71 UT WOS:000254563600363 ER PT S AU Eliza, SA Islam, SK Lee, I Greenbaum, E Ericson, MN Khan, MA AF Eliza, S. A. Islam, S. K. Lee, I. Greenbaum, E. Ericson, M. N. Khan, M. A. GP IEEE TI Detection of photosystem I reaction centers using chemically derivatized high electron mobility transistor SO 2007 IEEE SENSORS, VOLS 1-3 SE IEEE Sensors LA English DT Proceedings Paper CT 6th IEEE Sensors Conference CY OCT 28-31, 2007 CL Atlanta, GA SP IEEE Sensors Council ID PHOTOSYNTHETIC REACTION CENTERS AB This paper presents for the first time a microsensor for detecting Photosystem I (PS 1) reaction centers. In oxygenic plants, photons are captured with high quantum efficiency by two specialized reaction centers, Photosystems I and H (PS I and PS 11). Photon capture triggers rapid charge separation and the conversion of light energy into an electric voltage across the nanometer-scale (similar to 6 nm) reaction centers. AlGaN/GaN based High Electron Mobility Transistors (HEMTs) show high current throughputs and greater sensitivity to surface charges. PS I molecules were chemically immobilized the HEMT device and significant changes in the transistor characteristics were noticed. With zero gate bias and 5 V at drain terminal, drain current changes by about 5 mA for 6 mu l, drop of PS I solution. The difference between light and dark measurements is similar to 0.8 mA. Test results demonstrate that this approach is a potential candidate for detection and characterization of biomolecular photodiodes - PS I reaction centers. C1 [Eliza, S. A.; Islam, S. K.] Univ Tennessee, Dept Elect & Comp Engn, Knoxville, TN 37996 USA. [Lee, I.; Greenbaum, E.; Ericson, M. N.] Oak Ridge Natl Lab, Oak Ridge, TN USA. [Khan, M. A.] Univ S Carolina, Dept Elect & Comp Engn, Columbia, SC 29208 USA. RP Eliza, SA (reprint author), Univ Tennessee, Dept Elect & Comp Engn, Knoxville, TN 37996 USA. EM seliza@utk.edu RI Ericson, Milton/H-9880-2016 OI Ericson, Milton/0000-0002-6628-4865 FU Office of Biological and Environmental Research, U.S. Department of Energy; U.S. Department of Energy [DE-AC05-00OR22725] FX We thank J. W. Lee for Fig. 1. This research was supported by the Office of Biological and Environmental Research, U.S. Department of Energy (I.L., E.G.). Oak Ridge National Laboratory is managed by UTBattelle, LLC, for the U.S. Department of Energy, under Contract No. DE-AC05-00OR22725. We specially thank Miguel Rodriguez Jr. for extracting the PS I which was used in the experiment 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 1930-0395 BN 978-1-4244-1261-7 J9 IEEE SENSOR PY 2007 BP 1456 EP 1459 DI 10.1109/ICSENS.2007.4388688 PG 4 WC Computer Science, Artificial Intelligence; Engineering, Electrical & Electronic; Remote Sensing; Optics SC Computer Science; Engineering; Remote Sensing; Optics GA BHN71 UT WOS:000254563600369 ER PT S AU Okandan, M Hall, N Bicen, B Garcia, C Degertekin, FL AF Okandan, Murat Hall, Neal Bicen, Baris Garcia, Caesar Degertekin, F. Levent GP IEEE TI Optical microphone structures fabricated for broad bandwidth and low noise SO 2007 IEEE SENSORS, VOLS 1-3 SE IEEE Sensors LA English DT Proceedings Paper CT 6th IEEE Sensors Conference CY OCT 28-31, 2007 CL Atlanta, GA SP IEEE Sensors Council ID DISPLACEMENT DETECTION AB A micromachined optical microphone structure using a grating based interferometer has been presented previously and is undergoing continued development (JASA, vol. 118, pp 3000-3009, November 2005). Two advantages of the approach that have been highlighted in prior work are high displacement resolving capability of the microphone diaphragm vibration (2 pm rms over the audio bandwidth) and a flexible mechanical design space for achieving broad bandwidth and low thermal noise designs. Here, we summarize a variety of structures we are fabricating using Sandia National Laboratories silicon-based microfabrication technology to explore this versatile design space. These structures are being packaged to resemble instrumentation-type microphones with approximately 1cm(2) form factor in order to facilitate rigorous acoustic evaluation in the Micromachined Sensors and Transducers Laboratory (MiST) and anechoic test facilities at Georgia Tech. C1 [Okandan, Murat; Hall, Neal] Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. [Hall, Neal; Bicen, Baris; Garcia, Caesar; Degertekin, F. Levent] Georgia Inst Technol, Atlanta, GA USA. RP Okandan, M (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. EM mokanda@sandia.gov FU Intelligence community (IC) postdoctoral program; NIH; Catalyst Foundation; United States Department of Energy's National Nuclear Security Aministration [DE-AC04-94AL85000] FX The authors would like to acknowledge and thank the Intelligence community (IC) postdoctoral program, NIH and the Catalyst Foundation for supporting this research. Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the United States Department of Energys National Nuclear Security Administration under contract DE-AC04-94AL85000. NR 11 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 1930-0395 BN 978-1-4244-1261-7 J9 IEEE SENSOR PY 2007 BP 1472 EP 1475 DI 10.1109/ICSENS.2007.4388692 PG 4 WC Computer Science, Artificial Intelligence; Engineering, Electrical & Electronic; Remote Sensing; Optics SC Computer Science; Engineering; Remote Sensing; Optics GA BHN71 UT WOS:000254563600373 ER PT B AU Pon, RK Cardenas, AF Buttler, DJ Critchlow, TJ AF Pon, Raymond K. Cardenas, Alfonso F. Buttler, David J. Critchlow, Terence J. GP IEEE TI iScore: Measuring the interestingness of articles in a limited user environment SO 2007 IEEE SYMPOSIUM ON COMPUTATIONAL INTELLIGENCE AND DATA MINING, VOLS 1 AND 2 LA English DT Proceedings Paper CT IEEE Symposium on Computational Intelligence and Data Mining CY APR 01-05, 2007 CL Honolulu, HI SP IEEE AB Search engines, such as Google, assign scores to news articles based on their relevancy to a query. However, not all relevant articles for the query may be interesting to a user. For example, if the article is old or yields little new information, the article would be uninteresting. Relevancy scores do not take into account what makes an article interesting, which would vary from user to user. Although methods such as collaborative filtering have been shown to be effective in recommendation systems, in a limited user environment there are not enough users that would make collaborative filtering effective. We present a general framework for defining and measuring the "interestingness" of articles, incorporating user-feedback. We show 21% improvement over traditional IR methods. C1 [Pon, Raymond K.; Cardenas, Alfonso F.] Univ Calif Los Angeles, 402 Westwood Plaza, Los Angeles, CA 90095 USA. [Buttler, David J.; Critchlow, Terence J.] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Pon, RK (reprint author), Univ Calif Los Angeles, 402 Westwood Plaza, Los Angeles, CA 90095 USA. EM rpon@cs.ucia.edu; cardenas@cs.ucia.edu; buttler1@Ilnl.gov; critchlowl@Ilnl.gov FU U.S. Department of Energy by the University of California Lawrence Livermore National Laboratory [UCRL-CONF-225289, W-7405-Eng-48] FX This work (UCRL-CONF-225289) was performed under the auspices of the U.S. Department of Energy by the University of California Lawrence Livermore National Laboratory under contract number W-7405-Eng-48. NR 46 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0705-7 PY 2007 BP 354 EP 361 DI 10.1109/CIDM.2007.368896 PG 8 WC Computer Science, Artificial Intelligence SC Computer Science GA BGO89 UT WOS:000249119800053 ER PT B AU Top, P Dowla, F Gansemer, J AF Top, Philip Dowla, Farid Gansemer, Jim GP IEEE TI A dynamic programming algorithm for name matching SO 2007 IEEE SYMPOSIUM ON COMPUTATIONAL INTELLIGENCE AND DATA MINING, VOLS 1 AND 2 LA English DT Proceedings Paper CT IEEE Symposium on Computational Intelligence and Data Mining CY APR 01-05, 2007 CL Honolulu, HI SP IEEE AB In many database and data mining applications concerning people, name matching plays a key role. Many algorithms to match names have been proposed. These algorithms must take into account spelling and transcription errors, name abbreviations, nicknames, out of order names, and missing or extra names. The existing algorithms typically fall along the lines of sound based, edit distance based, or token based algorithms which can use other methods in matching each part of the name separately. In this article, we propose a dynamic programming approach that includes a substring matching algorithm. The algorithm's performance is compared against two often used algorithms by testing on a random sample of names from a database. The data used for the testing comes from the DHS US-VISIT Arrival and Departure Information System database, which includes names from all over the world. The performance on this data set was compared with the that of the Damerau-Levenshtein Algorithm and the Jaro-Winkler algorithm. The dynamic programming algorithm with substring matching performed better than both of these algorithms on the data tested. C1 [Top, Philip] Purdue Univ, Sch Elect & Comp Engn, W Lafayette, IN 47906 USA. [Dowla, Farid; Gansemer, Jim] Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. RP Top, P (reprint author), Purdue Univ, Sch Elect & Comp Engn, W Lafayette, IN 47906 USA. EM ptop@purdue.edu; dowlal@Ilnl.gov; gansemerl@Ilnl.gov FU Department of Homeland Security; US-VISIT Program Management Office; U.S. Department of Energy by University of California, Lawrence Livermore National Laboratory [W-7405-Eng-48, UCRL-CONF-225678] FX Thanks to the Department of Homeland Security and the US-VISIT Program Management Office for funding this research.; This work was performed under the auspices of the U.S. Department of Energy by University of California, Lawrence Livermore National Laboratory under Contract W-7405-Eng-48.; UCRL-CONF-225678. NR 9 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 978-1-4244-0705-7 PY 2007 BP 547 EP 551 DI 10.1109/CIDM.2007.368923 PG 5 WC Computer Science, Artificial Intelligence SC Computer Science GA BGO89 UT WOS:000249119800080 ER PT B AU Parvin, B Ghosh, N Heiser, L Knapp, M Talcott, C Laderoute, K Gray, J Spellman, P AF Parvin, B. Ghosh, N. Heiser, L. Knapp, M. Talcott, C. Laderoute, K. Gray, J. Spellman, P. GP IEEE TI Spectral Decomposition of Signaling Networks SO 2007 IEEE SYMPOSIUM ON COMPUTATIONAL INTELLIGENCE IN BIOINFORMATICS AND COMPUTATIONAL BIOLOGY LA English DT Proceedings Paper CT IEEE Symposium on Computational Intelligence in Bioinformatics and Computational Biology CY APR 01-05, 2007 CL Honolulu, HI ID PATHWAY; CANCER AB Many dynamical processes can be represented as directed attributed graphs or Petri nets where relationships between various entities are explicitly expressed. Signaling networks modeled as Petri nets are one class of such graphical modeling and representations. These networks encode how different protein in specific compartments, interact to create new protein products. Initially, the proteins and rules governing their interactions are curated from literature and then refined with experimental data. Variation in these networks occurs in topological structure, size, and weights associated on edges. Collectively, these variations are quite significant for manual and interactive analysis. Furthermore, as new information is added to these networks, the emergence of new computational models becomes paramount. From this perspective, hierarchical spectral methods are proposed and applied for inferring similarities and dissimilarities from an ensemble of graphs that corresponds to reaction networks. The technique has been implemented and tested on curated signaling networks that are derived for breast cancer cell lines. C1 [Parvin, B.; Ghosh, N.; Heiser, L.; Knapp, M.; Talcott, C.; Laderoute, K.; Gray, J.; Spellman, P.] Lawrence Berkeley Lab, Berkeley, CA 94720 USA. [Parvin, B.; Ghosh, N.; Heiser, L.; Knapp, M.; Talcott, C.; Laderoute, K.; Gray, J.; Spellman, P.] Stanford Res Inst, Stanford, CA 94305 USA. RP Parvin, B (reprint author), Lawrence Berkeley Lab, Berkeley, CA 94720 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 BN 978-1-4244-0710-1 PY 2007 BP 76 EP + PG 2 WC Computer Science, Interdisciplinary Applications; Engineering, Electrical & Electronic; Mathematical & Computational Biology SC Computer Science; Engineering; Mathematical & Computational Biology GA BGM70 UT WOS:000248516200011 ER EF