FN Thomson Reuters Web of Science™ VR 1.0 PT S AU Widmayer, CC Jones, OS Speck, DR Williams, WH Renard, PA Lawson, J AF Widmayer, CC Jones, OS Speck, DR Williams, WH Renard, PA Lawson, J BE Auerbach, J Bliss, E Dixit, S Feit, M Gold, D Haan, S Henesian, M Jones, O Lawson, J London, R Manes, K Munro, D Murray, J Pollaine, S Renard, P Rothenberg, J Sacks, R Speck, R TI The NIF's power and energy ratings for flat-in-time pulses SO NIF LASER SYSTEM PERFORMANCE RATINGS SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT 3rd International Conference on Solid State Lasers for Application to Inertial Confinement Fusion CY JUN 07-12, 1998 CL MONTEREY, CA SP Lawrence Livermore Natl Lab, Commissariat Energie Atom AB The National Ignition Facility (NIF) power and energy performance for flat temporal output pulses is discussed in this section. Power, energy, and temporal pulse distortion are calculated at key system interfaces. The distribution of power and energy amongst the NIF beams is calculated using a model of 192 independent beamlines. The mean performance of the 192 beamline model is found to be in good agreement with estimates of an average beam obtained using the PROP92 2-D laser propagation code. C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. RP Widmayer, CC (reprint author), Univ Calif Lawrence Livermore Natl Lab, POB 808,L490, Livermore, CA 94551 USA. NR 2 TC 2 Z9 2 U1 0 U2 0 PU SPIE-INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA SN 0277-786X BN 0-8194-2951-1 J9 P SOC PHOTO-OPT INS PY 1998 VL 3492 SI SUPPLEMENT BP 11 EP 21 PG 11 WC Optics; Physics, Fluids & Plasmas SC Optics; Physics GA BN61J UT WOS:000082355100002 ER PT S AU Williams, WH Auerbach, JM Henesian, MA Lawson, JK Renard, PA Sacks, RA AF Williams, WH Auerbach, JM Henesian, MA Lawson, JK Renard, PA Sacks, RA BE Auerbach, J Bliss, E Dixit, S Feit, M Gold, D Haan, S Henesian, M Jones, O Lawson, J London, R Manes, K Munro, D Murray, J Pollaine, S Renard, P Rothenberg, J Sacks, R Speck, R TI The NIF's basic focal spot for temporally flat pulses SO NIF LASER SYSTEM PERFORMANCE RATINGS SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT 3rd International Conference on Solid State Lasers for Application to Inertial Confinement Fusion CY JUN 07-12, 1998 CL MONTEREY, CA SP Lawrence Livermore Natl Lab, Commissariat Energie Atom AB The angular power spectrum of the focal spot for temporally flat pulses will be discussed in the context of optical phase errors among NIF components and the precorrection provided by the deformable mirror. The one-micron portion of NIF contributes most of the phase errors. The largest errors both in magnitude and scale length are the prompt pump-induced phase error resulting from flashlamp heating of the amplifiers and the residual thermal error fi om previous laser flashlamp firings. Other large-scale length phase errors come from basic figuring and mounting of optics. Small-scale length phase errors generally arise from the finishing and polishing of optics. Finally, the intensity-dependent nonlinear index of refraction for each optical component contributes phase changes to the beam. How well a temporally flat beam focuses in the wake of such phase distortion can be described in terms of its angular power spectrum The deformable mirror can compensate for the long-wavelength aberrations, but incompletely corrects for the shorter-scale phase noise. Consequently, the NIF focal spot size will be dictated chiefly by the finishing and homogeneity errors in the optics. Detailed simulations show that a temporally flat, high-power, 1-ns pulse in NIF will be limited to similar to 700TW/700 kJ (3 omega) due to damage of the tripler crystal and to the nonlinear spread during frequency conversion of the focal spot size at high power. Similar simulations predict that the NIF will achieve its spot size goal of 500TW inside a 250- mu m-diam circle on target for the 1-ns, temporally flat pulse. The maximum extractable energy from the NIF will be in a long, low-power, temporally flat pulse, providing approximately 2.7 MJ (3 omega)-a limit imposed by the energy stored in the pumped glass and the damage threshold of the tripler. C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. RP Williams, WH (reprint author), Univ Calif Lawrence Livermore Natl Lab, POB 808,L-490, Livermore, CA 94551 USA. NR 4 TC 2 Z9 2 U1 0 U2 2 PU SPIE-INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA SN 0277-786X BN 0-8194-2951-1 J9 P SOC PHOTO-OPT INS PY 1998 VL 3492 SI SUPPLEMENT BP 22 EP 38 PG 17 WC Optics; Physics, Fluids & Plasmas SC Optics; Physics GA BN61J UT WOS:000082355100003 ER PT S AU Feit, MD Widmayer, CC Williams, WH Sachs, RA Renard, PA Henessian, MA AF Feit, MD Widmayer, CC Williams, WH Sachs, RA Renard, PA Henessian, MA BE Auerbach, J Bliss, E Dixit, S Feit, M Gold, D Haan, S Henesian, M Jones, O Lawson, J London, R Manes, K Munro, D Murray, J Pollaine, S Renard, P Rothenberg, J Sacks, R Speck, R TI The NIF's assessment of the optical damage threat for flat-in-time pulses SO NIF LASER SYSTEM PERFORMANCE RATINGS SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT 3rd International Conference on Solid State Lasers for Application to Inertial Confinement Fusion CY JUN 07-12, 1998 CL MONTEREY, CA SP Lawrence Livermore Natl Lab, Commissariat Energie Atom ID LASER; BEAMLET AB High-power and high-energy flat-in-time pulses pose a damage threat to the optics in the NIF laser system. In particular, the phase noise put on the beam by optical finishing errors and defects in the optics grows as a result of the phenomenon of self-focusing. The control of the damage threat posed by beam break-up and "hot" holographic image formation will be discussed in this section. The flowdown of the damage threat to the key system components will also be presented. C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. RP Feit, MD (reprint author), Univ Calif Lawrence Livermore Natl Lab, POB 808,L490, Livermore, CA 94551 USA. NR 13 TC 0 Z9 0 U1 0 U2 0 PU SPIE-INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA SN 0277-786X BN 0-8194-2951-1 J9 P SOC PHOTO-OPT INS PY 1998 VL 3492 SI SUPPLEMENT BP 39 EP 48 PG 10 WC Optics; Physics, Fluids & Plasmas SC Optics; Physics GA BN61J UT WOS:000082355100004 ER PT S AU Jones, OS Speck, DR Widmayer, CC Williams, WH Renard, PA Lawson, JK AF Jones, OS Speck, DR Widmayer, CC Williams, WH Renard, PA Lawson, JK BE Auerbach, J Bliss, E Dixit, S Feit, M Gold, D Haan, S Henesian, M Jones, O Lawson, J London, R Manes, K Munro, D Murray, J Pollaine, S Renard, P Rothenberg, J Sacks, R Speck, R TI The NIF's power and energy ratings for ICF-shaped temporal pulses SO NIF LASER SYSTEM PERFORMANCE RATINGS SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT 3rd International Conference on Solid State Lasers for Application to Inertial Confinement Fusion CY JUN 07-12, 1998 CL MONTEREY, CA SP Lawrence Livermore Natl Lab, Commissariat Energie Atom AB The NIF power and energy performance for ICF shaped temporal output pulses is discussed in this section. Power, energy, and temporal pulse distortion are calculated at key system interfaces. The distribution of power and energy amongst the NIF beams is calculated using a model of 192 independent beamlines. The mean performance of the 192-beamline model is in agreement with estimates of an average beam obtained using the PROP92 2D laser propagation code. C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. RP Jones, OS (reprint author), Univ Calif Lawrence Livermore Natl Lab, POB 808, Livermore, CA 94551 USA. NR 2 TC 0 Z9 0 U1 1 U2 1 PU SPIE-INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA SN 0277-786X BN 0-8194-2951-1 J9 P SOC PHOTO-OPT INS PY 1998 VL 3492 SI SUPPLEMENT BP 49 EP 54 PG 6 WC Optics; Physics, Fluids & Plasmas SC Optics; Physics GA BN61J UT WOS:000082355100005 ER PT S AU Williams, WH Auerbach, JM Henesian, MA Lawson, JK Sacks, RA AF Williams, WH Auerbach, JM Henesian, MA Lawson, JK Sacks, RA BE Auerbach, J Bliss, E Dixit, S Feit, M Gold, D Haan, S Henesian, M Jones, O Lawson, J London, R Manes, K Munro, D Murray, J Pollaine, S Renard, P Rothenberg, J Sacks, R Speck, R TI The NIF'S basic focal spot for ICF temporally shaped pulses SO NIF LASER SYSTEM PERFORMANCE RATINGS SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT 3rd International Conference on Solid State Lasers for Application to Inertial Confinement Fusion CY JUN 07-12, 1998 CL MONTEREY, CA SP Lawrence Livermore Natl Lab, Commissariat Energie Atom AB A model of a NIF laser chain has been used to predict in detail the focal spot at various critical system interfaces using temporally shaped pulses of relevance for the ICF indirect drive and drive missions of the NIF. Results discussed here show the focal spot prior to what we term "focal spot conditioning" (i.e., the use of a kinoform phase plate and/or wide bandwidth for smoothing by spectral dispersion to develop a focal spot having tailored spatial and temporal characteristics). The addition of such conditioning to this beam, as discussed in Section 8, shows the laser capable of generating the focal spot necessary to meet the ICF indirect-drive mission of the NIF. C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. RP Williams, WH (reprint author), Univ Calif Lawrence Livermore Natl Lab, POB 808,L-490, Livermore, CA 94551 USA. NR 0 TC 4 Z9 4 U1 0 U2 1 PU SPIE-INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA SN 0277-786X BN 0-8194-2951-1 J9 P SOC PHOTO-OPT INS PY 1998 VL 3492 SI SUPPLEMENT BP 55 EP 60 PG 6 WC Optics; Physics, Fluids & Plasmas SC Optics; Physics GA BN61J UT WOS:000082355100006 ER PT S AU Feit, MD Williams, WH Widmayer, CC Sacks, RA Renard, PA Henesian, MA AF Feit, MD Williams, WH Widmayer, CC Sacks, RA Renard, PA Henesian, MA BE Auerbach, J Bliss, E Dixit, S Feit, M Gold, D Haan, S Henesian, M Jones, O Lawson, J London, R Manes, K Munro, D Murray, J Pollaine, S Renard, P Rothenberg, J Sacks, R Speck, R TI The NIF's assessment of the optical damage threat for shaped ICF pulses SO NIF LASER SYSTEM PERFORMANCE RATINGS SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT 3rd International Conference on Solid State Lasers for Application to Inertial Confinement Fusion CY JUN 07-12, 1998 CL MONTEREY, CA SP Lawrence Livermore Natl Lab, Commissariat Energie Atom AB The high-power and high-energy temporally shaped ICF pulses pose a damage threat to the optics in the NIF laser system. In particular, the phase noise put on the beam by optical finishing errors and defects in the optics grows as a result of the phenomenon of self-focusing. The control of the damage threat posed by beam break-up and "hot" holographic image formation will be discussed in this section. The flowdown of the damage threat to the key system components will also be presented. C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. RP Feit, MD (reprint author), Univ Calif Lawrence Livermore Natl Lab, POB 808,L-4390, Livermore, CA 94551 USA. NR 2 TC 0 Z9 0 U1 0 U2 0 PU SPIE-INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA SN 0277-786X BN 0-8194-2951-1 J9 P SOC PHOTO-OPT INS PY 1998 VL 3492 SI SUPPLEMENT BP 61 EP 64 PG 4 WC Optics; Physics, Fluids & Plasmas SC Optics; Physics GA BN61J UT WOS:000082355100007 ER PT S AU Rothenberg, JE Auerbach, JM Dixit, SN Haan, SW Pollaine, SM Williams, WH AF Rothenberg, JE Auerbach, JM Dixit, SN Haan, SW Pollaine, SM Williams, WH BE Auerbach, J Bliss, E Dixit, S Feit, M Gold, D Haan, S Henesian, M Jones, O Lawson, J London, R Manes, K Munro, D Murray, J Pollaine, S Renard, P Rothenberg, J Sacks, R Speck, R TI Focal spot conditioning for indirect drive on the NIF SO NIF LASER SYSTEM PERFORMANCE RATINGS SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT 3rd International Conference on Solid State Lasers for Application to Inertial Confinement Fusion CY JUN 07-12, 1998 CL MONTEREY, CA SP Lawrence Livermore Natl Lab, Commissariat Energie Atom ID LASER-BEAM; INCOHERENCE; PROFILES AB The indirect-drive approach to ICF requires precisely controlled target illumination. One must ensure adequate clearance as the focused beam passes through the laser entrance hole (LEH) in the hohlraum, while minimizing scattering from laser plasma instabilities in the beam center. This leads to a requirement on the maximum allowable focal intensity, and thus one desires the largest flat-top focal spot while maintaining minimal wings. A kinoform phase plate (KPP) can be used to accurately form the ideal central (elliptical) focal spot shape with minimal wings, however, aberrations and nonlinear effects in the laser system can cause a large increase in the wings of this ideal spot. Phase correction schemes can be implemented which, in principle, can greatly reduce the broadening and wings of the central focal spot. In addition to the KPP, a second conditioning technique to be implemented on the NIF is SSD, which is used to reduce the brightness of speckle hot spots within the central focus. SSD causes rapid motion of these hot spots, which effectively reduces the peak intensity driving the plasma instabilities. The increased laser bandwidth required for SSD results in reduced frequency conversion, and as a result of the added divergence of SSD, the focal spot broadens further. An analysis of the effects of the KPP, phase correction methods, and SSD on the focal spot and their relation to the target specifications and performance is presented in this section. C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. RP Rothenberg, JE (reprint author), Univ Calif Lawrence Livermore Natl Lab, POB 808,L-439, Livermore, CA 94551 USA. NR 10 TC 0 Z9 0 U1 0 U2 0 PU SPIE-INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA SN 0277-786X BN 0-8194-2951-1 J9 P SOC PHOTO-OPT INS PY 1998 VL 3492 SI SUPPLEMENT BP 65 EP 77 PG 13 WC Optics; Physics, Fluids & Plasmas SC Optics; Physics GA BN61J UT WOS:000082355100008 ER PT S AU Jones, OS Speck, DR Haan, SW AF Jones, OS Speck, DR Haan, SW BE Auerbach, J Bliss, E Dixit, S Feit, M Gold, D Haan, S Henesian, M Jones, O Lawson, J London, R Manes, K Munro, D Murray, J Pollaine, S Renard, P Rothenberg, J Sacks, R Speck, R TI The NIF power balance SO NIF LASER SYSTEM PERFORMANCE RATINGS SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT 3rd International Conference on Solid State Lasers for Application to Inertial Confinement Fusion CY JUN 07-12, 1998 CL MONTEREY, CA SP Lawrence Livermore Natl Lab, Commissariat Energie Atom AB The ICF ignition targets require careful balancing of the power amongst the 192 beams that irradiate them. The baseline system is designed to provide 8% rms power balance for the baseline indirect-drive and direct-drive targets. Power imbalance is due both to repeatable and shot-to-shot differences among beams. Repeatable differences in beam performance are due to unavoidable differences in transmission, gain, frequency conversion efficiency, and beam area. They are compensated for by adjusting the input energy to each beam. Shot-to-shot differences are caused by jitter in the OPG system output, the amplifier gains, pulse timing, and the frequency converter efficiencies. The allowable jitter for each of these subsystems has been set such that the laser as a whole meets the 8% system requirement. This problem was analyzed using the BTGAIN code, which solves for either the input or the output pulse shape for a chain of active and passive laser components, given the pulse shape at the other end of the system. Key features are that the amplifier slabs are modeled using Frantz-Nodvic theory to account for amplifier saturation, and each component is assigned a transmission to model distributed losses. Frequency tripling efficiency is modeled with a patch to the code that includes deviations from the optimum phase-matching angle to account for fabrication and alignment differences among the tripler assemblies. First, a 192-beam model was built, with each beam made up of components whose gain, transmission, or deviation from the phase-matching angle was randomly selected from a Gaussian distribution representing component tolerances. Then a series of Monte Carlo calculations were performed to determine the optimum strategies for compensating for repeatable differences among beams and to determine the allocation of shot-to-shot errors among subsystems to meet the power balance requirement. Detailed results from these calculations will be presented in this section. C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. RP Jones, OS (reprint author), Univ Calif Lawrence Livermore Natl Lab, POB 808,L-030, Livermore, CA 94551 USA. NR 3 TC 2 Z9 2 U1 0 U2 0 PU SPIE-INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA SN 0277-786X BN 0-8194-2951-1 J9 P SOC PHOTO-OPT INS PY 1998 VL 3492 SI SUPPLEMENT BP 78 EP 104 PG 27 WC Optics; Physics, Fluids & Plasmas SC Optics; Physics GA BN61J UT WOS:000082355100009 ER PT S AU Munro, DH Gold, DM Speck, DR Auerbach, JM AF Munro, DH Gold, DM Speck, DR Auerbach, JM BE Auerbach, J Bliss, E Dixit, S Feit, M Gold, D Haan, S Henesian, M Jones, O Lawson, J London, R Manes, K Munro, D Murray, J Pollaine, S Renard, P Rothenberg, J Sacks, R Speck, R TI Prepulse of the NIF laser system SO NIF LASER SYSTEM PERFORMANCE RATINGS SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT 3rd International Conference on Solid State Lasers for Application to Inertial Confinement Fusion CY JUN 07-12, 1998 CL MONTEREY, CA SP Lawrence Livermore Natl Lab, Commissariat Energie Atom AB The origins of prepulse for the NIF laser are discussed in this section, and the prepulse brightness is estimated as a function of time before the arrival of the main pulse. The results of experiments to measure prepulse damage to fusion capsule surface finish are also shown. The current prepulse estimates are near or below the level that would cause significant damage to a beryllium capsule surface. Finally, a technique for reducing the prepulse at the target to even lower levels, should that prove necessary, is described. C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. RP Munro, DH (reprint author), Univ Calif Lawrence Livermore Natl Lab, POB 808,L-477, Livermore, CA 94551 USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU SPIE-INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA SN 0277-786X BN 0-8194-2951-1 J9 P SOC PHOTO-OPT INS PY 1998 VL 3492 SI SUPPLEMENT BP 105 EP 111 PG 7 WC Optics; Physics, Fluids & Plasmas SC Optics; Physics GA BN61J UT WOS:000082355100010 ER PT S AU Sommer, SC Bliss, ES AF Sommer, SC Bliss, ES BE Auerbach, J Bliss, E Dixit, S Feit, M Gold, D Haan, S Henesian, M Jones, O Lawson, J London, R Manes, K Munro, D Murray, J Pollaine, S Renard, P Rothenberg, J Sacks, R Speck, R TI Beam positioning SO NIF LASER SYSTEM PERFORMANCE RATINGS SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT 3rd International Conference on Solid State Lasers for Application to Inertial Confinement Fusion CY JUN 07-12, 1998 CL MONTEREY, CA SP Lawrence Livermore Natl Lab, Commissariat Energie Atom AB Major scientific goals of the 192-laser beam NIF, which is being built at the LLNL, are to "ignite" small fusion targets and to conduct high-energy-density physics experiments for evaluating the use of fusion as a viable power source and for nuclear stockpile stewardship activities. To achieve these goals, the position and direction of all 192 beams must be sufficiently stable to allow their accurate alignment through the laser to the target and to maintain that alignment until the shot is complete. This paper provides an overview of the NIF stability budget, reviews the methodology in the development of stability allocations, discusses efforts to evaluate the stability response of NIF optical support structures, and provides a list of references for the MOF beam position error budget. NIF stability allocations are primarily developed from the requirement that the deviation in the position of all the beams on target shall not exceed 50 microns. The major contributors to the beam position on target are the accuracy of the alignment process and the stability of the laser system before and during a shot. System stability also affects the repeatability of frequency conversion efficiency and the successful operation of narrow field-of-view diagnostics. All components that are involved in beam alignment, or are capable of moving a beam on the target, must meet the requirements of the NIF stability budget, and allocations in this budget must account for three major aspects of stability considerations. First, there are multiple input sources that can cause structural drift, such as ambient vibration, acoustical excitation, wind fluctuations, flow-induced vibrations, and thermal transients. In addition, there are thousands of structural elements that can transmit or amplify the input perturbations if their design is not optimized. Finally, the optics that the structures support are mirrors or lenses contained in 192 independent beams, and their motion will influence beam propagation. NIF optical components are supported in the two laser bays primarily by hybrid support structures of reinforced concrete (RC) pedestals and steel frame or vessels and in the switchyards by large steel space frames attached to the corners of the RC switchyard/target area building. Inside the target area are the target chamber and floors that also support optical components and diagnostic equipment. With analytical models of the support structures and excitation sources defined by power spectral density (PSD) spectra or other appropriate techniques, dynamic analyses have been used to evaluate and demonstrate the stability of the NIF optical components. From the results obtained to date, it is expected that the NIF will satisfy its stability requirements. C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. RP Sommer, SC (reprint author), Univ Calif Lawrence Livermore Natl Lab, POB 808,L-495, Livermore, CA 94551 USA. NR 46 TC 3 Z9 3 U1 0 U2 0 PU SPIE-INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA SN 0277-786X BN 0-8194-2951-1 J9 P SOC PHOTO-OPT INS PY 1998 VL 3492 SI SUPPLEMENT BP 112 EP 135 PG 24 WC Optics; Physics, Fluids & Plasmas SC Optics; Physics GA BN61J UT WOS:000082355100011 ER PT S AU Manes, KR London, RA Sutton, SB Zapata, LE AF Manes, KR London, RA Sutton, SB Zapata, LE BE Auerbach, J Bliss, E Dixit, S Feit, M Gold, D Haan, S Henesian, M Jones, O Lawson, J London, R Manes, K Munro, D Murray, J Pollaine, S Renard, P Rothenberg, J Sacks, R Speck, R TI Shot rate - thermal recovery SO NIF LASER SYSTEM PERFORMANCE RATINGS SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT 3rd International Conference on Solid State Lasers for Application to Inertial Confinement Fusion CY JUN 07-12, 1998 CL MONTEREY, CA SP Lawrence Livermore Natl Lab, Commissariat Energie Atom AB The NIF system will have many different users. The system is being designed to have an initial shot rate of eight hours and, if the need arises, to increase the shot rate in the out-years to four-to-six hours. It is phase errors that result from repeated firings of the flashlamps that determine the focal spots of the individual 192 beams. Flashlamp cooling and radiative cooling of the pump cavity are used to reduce the phase errors to the level needed to produce the desired focal spot. A flowdown analysis that identifies the major contributors to these cumulative phase errors is presented in this section. Methods for increasing the shot rate in the out-years are also discussed. C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. RP Manes, KR (reprint author), Univ Calif Lawrence Livermore Natl Lab, POB 808,L-465, Livermore, CA 94551 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SPIE-INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA SN 0277-786X BN 0-8194-2951-1 J9 P SOC PHOTO-OPT INS PY 1998 VL 3492 SI SUPPLEMENT BP 136 EP 149 PG 14 WC Optics; Physics, Fluids & Plasmas SC Optics; Physics GA BN61J UT WOS:000082355100012 ER PT B AU Huang, Z Lai, CCA AF Huang, Z Lai, CCA GP AMER METEOROL SOC AMER METEOROL SOC TI Multidecadal variability of the southwestern United States monsoon precipitation in the past century SO NINTH CONFERENCE ON INTERACTION OF THE SEA AND ATMOSPHERE LA English DT Proceedings Paper CT 9th Conference on Interaction of the Sea and Atmosphere at the 78th American-Meteorogical-Society Annual Meeting CY JAN 11-16, 1998 CL PHOENIX, AZ SP Amer Meteorol Soc AB The multidecadal variabilities in the observational records of the precipitation over the southwestern United States monsoon area including most of Arizona and New Mexico during the past century have been examined. Its correlations with the monsoon circulation associated with the lower level moisture transport from the Gulf of Mexico and eastern tropical Pacific have been diagnostically investigated. The possible impacts of the global warming and solar forcing on the multidecadal variability of the monsoon system have been discussed. The teleconnection between the secular variations in the North American monsoon and the Indian monsoon has been explored. C1 Univ Calif Los Alamos Natl Lab, Div Earth & Environm Sci, Atmospher & Climate Sci Grp, Los Alamos, NM 87545 USA. RP Huang, Z (reprint author), Univ Calif Los Alamos Natl Lab, Div Earth & Environm Sci, Atmospher & Climate Sci Grp, Los Alamos, NM 87545 USA. NR 0 TC 4 Z9 4 U1 0 U2 0 PU AMER METEOROLOGICAL SOCIETY PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108 USA PY 1998 BP 159 EP 166 PG 8 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA BL80E UT WOS:000076779300042 ER PT B AU Hnilo, JJ Santer, BD Boyle, JS Fiorino, M AF Hnilo, JJ Santer, BD Boyle, JS Fiorino, M GP AMER METEOROL SOC AMER METEOROL SOC TI Comparison of observed and simulated microwave sounding unit temperatures for the NCEP and ERA re-analyses SO NINTH SYMPOSIUM ON GLOBAL CHANGE STUDIES LA English DT Proceedings Paper CT 9th Symposium on Global Change Studies/Namias Symposium on Status and Prospects for Climate Prediction at the 78th American-Meteorological-Society CY JAN 11-16, 1998 CL PHOENIX, AZ SP Amer Meteorol Soc C1 Univ Calif Lawrence Livermore Natl Lab, PCMDI, Livermore, CA 94551 USA. RP Hnilo, JJ (reprint author), Univ Calif Lawrence Livermore Natl Lab, PCMDI, POB 808,Mail Stop L-264, Livermore, CA 94551 USA. RI Fiorino, Michael/N-4150-2014 OI Fiorino, Michael/0000-0002-2819-8157 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER METEOROLOGICAL SOCIETY PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108 USA PY 1998 BP 139 EP 140 PG 2 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA BL80D UT WOS:000076779200042 ER PT B AU Kaiser, DP AF Kaiser, DP GP AMER METEOROL SOC AMER METEOROL SOC TI Analysis of monthly mean cloud amount for China: 1951-1994 SO NINTH SYMPOSIUM ON GLOBAL CHANGE STUDIES LA English DT Proceedings Paper CT 9th Symposium on Global Change Studies/Namias Symposium on Status and Prospects for Climate Prediction at the 78th American-Meteorological-Society CY JAN 11-16, 1998 CL PHOENIX, AZ SP Amer Meteorol Soc C1 Oak Ridge Natl Lab, Div Environm Sci, Carbon Dioxide Informat Anal Ctr, Oak Ridge, TN 37831 USA. RP Kaiser, DP (reprint author), Oak Ridge Natl Lab, Div Environm Sci, Carbon Dioxide Informat Anal Ctr, POB 2008,MS-6335, Oak Ridge, TN 37831 USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU AMER METEOROLOGICAL SOCIETY PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108 USA PY 1998 BP 168 EP 171 PG 2 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA BL80D UT WOS:000076779200050 ER PT S AU Ng, TB Han, J Biefeld, RM Zolper, JC Crawford, MH Follstaedt, DM AF Ng, TB Han, J Biefeld, RM Zolper, JC Crawford, MH Follstaedt, DM BE Ponce, FA DenBaars, SP Meyer, BK Nakamura, S Strite, S TI The effect of hydrogen carrier gas on the morphological evolution and material properties of GaN on sapphire SO NITRIDE SEMICONDUCTORS SE MATERIALS RESEARCH SOCIETY SYMPOSIUM PROCEEDINGS LA English DT Proceedings Paper CT Symposium on Nitride Semiconductors, at the 1997 MRS Fall Meeting CY DEC 01-05, 1997 CL BOSTON, MA SP Mat Res Soc, Aixtron Semiconductor Technol GmbH, Bede Sci Inc, EMCORE, Lake Shore Cryotron Inc, Morton Int, MMR Technol Inc, Nichia Chem Ind, Renishaw PLC, Rockwell Int, Siemens, SULA Technol, SVT Assoc Inc, Thomas Swan & Co Ltd, Toyoda Gosel Co Ltd, Xerox Palo Alto Res Ctr AB In-situ optical reflectance is used to monitor the morphological evolution of the two-step GaN growth on sapphire. The amount of H-2 carrier gas used in the growth is observed to strongly influence the morphological evolution of the low temperature buffer layer and the subsequent high temperature nucleation behavior, which in turn affects the structural and electrical properties of the GaN epitaxial films. The optical reflectance transients correlate with the sizes and distributions of nuclei as observed by AFM. C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Ng, TB (reprint author), Sandia Natl Labs, Albuquerque, NM 87185 USA. NR 0 TC 0 Z9 0 U1 1 U2 1 PU MATERIALS RESEARCH SOCIETY PI WARRENDALE PA 506 KEYSTONE DRIVE, WARRENDALE, PA 15088-7563 USA SN 0272-9172 BN 1-55899-387-8 J9 MATER RES SOC SYMP P PY 1998 VL 482 BP 143 EP 148 PG 6 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Materials Science, Characterization & Testing; Materials Science, Coatings & Films SC Engineering; Materials Science GA BK98K UT WOS:000073983100021 ER PT S AU Liliental-Weber, Z Ruvimov, S Swider, W Kim, Y Washburn, J Nakamura, S Kern, RS Chen, Y Yang, JW AF Liliental-Weber, Z Ruvimov, S Swider, W Kim, Y Washburn, J Nakamura, S Kern, RS Chen, Y Yang, JW BE Ponce, FA DenBaars, SP Meyer, BK Nakamura, S Strite, S TI Role of dopants and impurities on pinhole formation; Defects formed at InGaN/GaN and AlGaN/GaN quantum wells SO NITRIDE SEMICONDUCTORS SE MATERIALS RESEARCH SOCIETY SYMPOSIUM PROCEEDINGS LA English DT Proceedings Paper CT Symposium on Nitride Semiconductors, at the 1997 MRS Fall Meeting CY DEC 01-05, 1997 CL BOSTON, MA SP Mat Res Soc, Aixtron Semiconductor Technol GmbH, Bede Sci Inc, EMCORE, Lake Shore Cryotron Inc, Morton Int, MMR Technol Inc, Nichia Chem Ind, Renishaw PLC, Rockwell Int, Siemens, SULA Technol, SVT Assoc Inc, Thomas Swan & Co Ltd, Toyoda Gosel Co Ltd, Xerox Palo Alto Res Ctr AB Transmission electron microscopy has been applied to study defects in epitaxial doped and undoped GaN layers grown by MOCVD on sapphire and SiC substrates. Samples with InGaN/GaN and AlGaN/InGaN heterostructures have also been investigated The results of this study show that incorporation of "foreign" atoms increases formation of nano-tubes and pinholes. The highest density of these defects was formed close to the interface with sapphire where oxygen outdiffusion might be expected, or in the subsurface area in the samples where oxygen was added deliberately. Addition of In (or Al) at QW's also leads to pinhole formation. Increased In fraction or a larger number of QW's results in a greater density of pinholes and more surface roughness. Many of the "hollow" nanotube defects an: terminated during growth. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Liliental-Weber, Z (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, MS 62-203, Berkeley, CA 94720 USA. RI Liliental-Weber, Zuzanna/H-8006-2012 NR 0 TC 9 Z9 9 U1 0 U2 1 PU MATERIALS RESEARCH SOCIETY PI WARRENDALE PA 506 KEYSTONE DRIVE, WARRENDALE, PA 15088-7563 USA SN 0272-9172 BN 1-55899-387-8 J9 MATER RES SOC SYMP P PY 1998 VL 482 BP 375 EP 380 PG 6 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Materials Science, Characterization & Testing; Materials Science, Coatings & Films SC Engineering; Materials Science GA BK98K UT WOS:000073983100055 ER PT S AU Ruvimov, S Liliental-Weber, Z Washburn, J Amano, H Akasaki, I Koike, M AF Ruvimov, S Liliental-Weber, Z Washburn, J Amano, H Akasaki, I Koike, M BE Ponce, FA DenBaars, SP Meyer, BK Nakamura, S Strite, S TI Atomic structure of grain boundaries and interfaces in III-nitrides epitaxial systems SO NITRIDE SEMICONDUCTORS SE MATERIALS RESEARCH SOCIETY SYMPOSIUM PROCEEDINGS LA English DT Proceedings Paper CT Symposium on Nitride Semiconductors, at the 1997 MRS Fall Meeting CY DEC 01-05, 1997 CL BOSTON, MA SP Mat Res Soc, Aixtron Semiconductor Technol GmbH, Bede Sci Inc, EMCORE, Lake Shore Cryotron Inc, Morton Int, MMR Technol Inc, Nichia Chem Ind, Renishaw PLC, Rockwell Int, Siemens, SULA Technol, SVT Assoc Inc, Thomas Swan & Co Ltd, Toyoda Gosel Co Ltd, Xerox Palo Alto Res Ctr AB High resolution electron microscopy (HREM) was applied to study atomic structure of stacking faults, grain boundaries and interfaces in III-nitrides epitaxial layers grown by MOVPE on sapphire. Defects formed in GaN epitaxial layers grown by MOVPE were reviewed in comparison with those in MBE grown materials. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Ruvimov, S (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RI Liliental-Weber, Zuzanna/H-8006-2012 NR 0 TC 7 Z9 7 U1 0 U2 0 PU MATERIALS RESEARCH SOCIETY PI WARRENDALE PA 506 KEYSTONE DRIVE, WARRENDALE, PA 15088-7563 USA SN 0272-9172 BN 1-55899-387-8 J9 MATER RES SOC SYMP P PY 1998 VL 482 BP 387 EP 392 PG 6 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Materials Science, Characterization & Testing; Materials Science, Coatings & Films SC Engineering; Materials Science GA BK98K UT WOS:000073983100057 ER PT S AU Kruger, J Sudhir, GS Corlatan, D Cho, Y Kim, Y Klockenbrink, R Rouvimov, S Liliental-Weber, Z Kisielowski, C Rubin, M Weber, ER McDermott, B Pittman, R Gertner, ER AF Kruger, J Sudhir, GS Corlatan, D Cho, Y Kim, Y Klockenbrink, R Rouvimov, S Liliental-Weber, Z Kisielowski, C Rubin, M Weber, ER McDermott, B Pittman, R Gertner, ER BE Ponce, FA DenBaars, SP Meyer, BK Nakamura, S Strite, S TI Comparative analysis of strain and stress in MBE and MOCVD grown GaN thin films on sapphire SO NITRIDE SEMICONDUCTORS SE MATERIALS RESEARCH SOCIETY SYMPOSIUM PROCEEDINGS LA English DT Proceedings Paper CT Symposium on Nitride Semiconductors, at the 1997 MRS Fall Meeting CY DEC 01-05, 1997 CL BOSTON, MA SP Mat Res Soc, Aixtron Semiconductor Technol GmbH, Bede Sci Inc, EMCORE, Lake Shore Cryotron Inc, Morton Int, MMR Technol Inc, Nichia Chem Ind, Renishaw PLC, Rockwell Int, Siemens, SULA Technol, SVT Assoc Inc, Thomas Swan & Co Ltd, Toyoda Gosel Co Ltd, Xerox Palo Alto Res Ctr AB In this study, the causes of biaxial and hydrostatic stress components in epitaxially grown thin GaN films on sapphire are analyzed. It is observed that growth by Molecular Beam Epitaxy (MBE) and by Metal Organic Chemical Vapor Deposition (MOCVD) are governed by very similar physical principles. Differences in the absolute stress values are mainly due to the difference in growth temperature. It is argued that in the case of MOCVD growth the onset of plasticity for higher growth temperatures is responsible for a larger stress relaxation in the buffer layer. It is further found that either process can result in highly off-stoichiometric GaN layers, as manifested by the large variations in the a and c lattice parameters caused by intrinsic point defects. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Kruger, J (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, M-S 2-200,1 Cyclotron Rd, Berkeley, CA 94720 USA. RI Liliental-Weber, Zuzanna/H-8006-2012 NR 0 TC 7 Z9 7 U1 0 U2 4 PU MATERIALS RESEARCH SOCIETY PI WARRENDALE PA 506 KEYSTONE DRIVE, WARRENDALE, PA 15088-7563 USA SN 0272-9172 BN 1-55899-387-8 J9 MATER RES SOC SYMP P PY 1998 VL 482 BP 447 EP 452 PG 6 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Materials Science, Characterization & Testing; Materials Science, Coatings & Films SC Engineering; Materials Science GA BK98K UT WOS:000073983100067 ER PT S AU Corlatan, D Kruger, J Kisielowski, C Klockenbrink, R Kim, YW Peyrot, SGSY Rubin, M Weber, ER AF Corlatan, D Kruger, J Kisielowski, C Klockenbrink, R Kim, YW Peyrot, SGSY Rubin, M Weber, ER BE Ponce, FA DenBaars, SP Meyer, BK Nakamura, S Strite, S TI Photoluminescence characterization of p-type GaN : Mg SO NITRIDE SEMICONDUCTORS SE MATERIALS RESEARCH SOCIETY SYMPOSIUM PROCEEDINGS LA English DT Proceedings Paper CT Symposium on Nitride Semiconductors, at the 1997 MRS Fall Meeting CY DEC 01-05, 1997 CL BOSTON, MA SP Mat Res Soc, Aixtron Semiconductor Technol GmbH, Bede Sci Inc, EMCORE, Lake Shore Cryotron Inc, Morton Int, MMR Technol Inc, Nichia Chem Ind, Renishaw PLC, Rockwell Int, Siemens, SULA Technol, SVT Assoc Inc, Thomas Swan & Co Ltd, Toyoda Gosel Co Ltd, Xerox Palo Alto Res Ctr AB We report on results of low-temperature photoluminescence measurements performed on GaN films, grown by molecular beam epitaxy (MBE) on sapphire substrates. The GaN films are either Mg doped (p-type) or consist of a Mg-doped layer on top of a Si doped GaN layer (n-type). In the p-doped samples, the sharpness of the donor-acceptor-pair transition is striking, three phonon replicas are clearly resolved. A transition band occurs around 3.4 eV, which becomes dominant for samples with an np-layer structure. The position and the composition of the near band edge transitions are influenced by the growth of the buffer layers. Depending on the growth conditions a transition at 3.51 eV can be observed. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Dept Mat Sci, Berkeley, CA 94720 USA. RP Corlatan, D (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Dept Mat Sci, Berkeley, CA 94720 USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU MATERIALS RESEARCH SOCIETY PI WARRENDALE PA 506 KEYSTONE DRIVE, WARRENDALE, PA 15088-7563 USA SN 0272-9172 BN 1-55899-387-8 J9 MATER RES SOC SYMP P PY 1998 VL 482 BP 673 EP 678 PG 6 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Materials Science, Characterization & Testing; Materials Science, Coatings & Films SC Engineering; Materials Science GA BK98K UT WOS:000073983100101 ER PT S AU Perlin, P Weinstein, BA Christensen, NE Gorczyca, I Iota, V Suski, T Wisniewski, P Osinski, M Eliseev, PG AF Perlin, P Weinstein, BA Christensen, NE Gorczyca, I Iota, V Suski, T Wisniewski, P Osinski, M Eliseev, PG BE Ponce, FA DenBaars, SP Meyer, BK Nakamura, S Strite, S TI Cubic InN inclusions as the cause for the unusually weak pressure shift of the luminescence in InGaN SO NITRIDE SEMICONDUCTORS SE MATERIALS RESEARCH SOCIETY SYMPOSIUM PROCEEDINGS LA English DT Proceedings Paper CT Symposium on Nitride Semiconductors, at the 1997 MRS Fall Meeting CY DEC 01-05, 1997 CL BOSTON, MA SP Mat Res Soc, Aixtron Semiconductor Technol GmbH, Bede Sci Inc, EMCORE, Lake Shore Cryotron Inc, Morton Int, MMR Technol Inc, Nichia Chem Ind, Renishaw PLC, Rockwell Int, Siemens, SULA Technol, SVT Assoc Inc, Thomas Swan & Co Ltd, Toyoda Gosel Co Ltd, Xerox Palo Alto Res Ctr AB We propose a new approach to explain the unusually low pressure coefficients of the luminescence peaks observed in single-quantum-well InGaN-based light emitting diodes manufactured by Nichia Chemical Industries. In view of the most recent first principles band structure calculations for InN under hydrostatic pressure, we find that it is possible to reproduce the measured low (12-16meV/GPa) pressure coefficients of the luminescence by assuming the formation of zincblende InN inclusions in the InGaN quantum well layers. These cubic inclusions, surrounded by the usual wurtzite material, should act like quantum dots giving rise to enhanced electron localization. Obtained this way, the pressure shift of the luminescence peaks in blue and green InGaN-based emitters should be close to 14meV/GPa, in good agreement with our experimental results. This explanation of the observed low pressure coefficients in these devices is consistent with recent independent evidence for InN inclusions in InGaN epilayers. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Perlin, P (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU MATERIALS RESEARCH SOCIETY PI WARRENDALE PA 506 KEYSTONE DRIVE, WARRENDALE, PA 15088-7563 USA SN 0272-9172 BN 1-55899-387-8 J9 MATER RES SOC SYMP P PY 1998 VL 482 BP 697 EP 702 PG 6 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Materials Science, Characterization & Testing; Materials Science, Coatings & Films SC Engineering; Materials Science GA BK98K UT WOS:000073983100105 ER PT S AU Ager, JW Conti, G Romano, LT Kisielowski, C AF Ager, JW Conti, G Romano, LT Kisielowski, C BE Ponce, FA DenBaars, SP Meyer, BK Nakamura, S Strite, S TI Gradients in heteroepitaxial gallium nitride films SO NITRIDE SEMICONDUCTORS SE MATERIALS RESEARCH SOCIETY SYMPOSIUM PROCEEDINGS LA English DT Proceedings Paper CT Symposium on Nitride Semiconductors, at the 1997 MRS Fall Meeting CY DEC 01-05, 1997 CL BOSTON, MA SP Mat Res Soc, Aixtron Semiconductor Technol GmbH, Bede Sci Inc, EMCORE, Lake Shore Cryotron Inc, Morton Int, MMR Technol Inc, Nichia Chem Ind, Renishaw PLC, Rockwell Int, Siemens, SULA Technol, SVT Assoc Inc, Thomas Swan & Co Ltd, Toyoda Gosel Co Ltd, Xerox Palo Alto Res Ctr AB Heteroepitaxial GaN films grown on sapphire are usually in a compressive residual biaxial stress state that is typically 100 -500 MPa but can be as high as 1 GPa. Spatially resolved measurements of GaN film stresses obtained via micro-Raman spectroscopy using shifts in the frequency of the E-2 phonon are presented. The spatial resolution of this stress measurement technique is ca. 2 mu m laterally and 10 mu m in the axial (growth) direction. Two interesting stress gradients are found near cleaved edges. (1) On the surface of the cleaved edge the compressive film stress is a maximum at the GaN/sapphire interface and relaxes to a nearly stress-free state towards the free edge. (2)In the lateral direction, the stress increases away from the edge, reaching a steady-state value at approximately 10x the film thickness. It is shown that the effects are consistent with existing finite element models used to treat strained growth of surface structures in other semiconductor systems. An axial stress gradient that is not associated with edge effects is found in some thick (>20 mu m) HVPE-grown films. The interface region is found to be up to 500 MPa in compression, but this stress declines toward the film surface, which is found to be nearly stress free. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. RP Ager, JW (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. NR 0 TC 9 Z9 9 U1 0 U2 3 PU MATERIALS RESEARCH SOCIETY PI WARRENDALE PA 506 KEYSTONE DRIVE, WARRENDALE, PA 15088-7563 USA SN 0272-9172 BN 1-55899-387-8 J9 MATER RES SOC SYMP P PY 1998 VL 482 BP 769 EP 774 PG 6 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Materials Science, Characterization & Testing; Materials Science, Coatings & Films SC Engineering; Materials Science GA BK98K UT WOS:000073983100116 ER PT S AU Wright, AF AF Wright, AF BE Ponce, FA DenBaars, SP Meyer, BK Nakamura, S Strite, S TI Theoretical investigation of extended defects in group-III nitrides SO NITRIDE SEMICONDUCTORS SE MATERIALS RESEARCH SOCIETY SYMPOSIUM PROCEEDINGS LA English DT Proceedings Paper CT Symposium on Nitride Semiconductors, at the 1997 MRS Fall Meeting CY DEC 01-05, 1997 CL BOSTON, MA SP Mat Res Soc, Aixtron Semiconductor Technol GmbH, Bede Sci Inc, EMCORE, Lake Shore Cryotron Inc, Morton Int, MMR Technol Inc, Nichia Chem Ind, Renishaw PLC, Rockwell Int, Siemens, SULA Technol, SVT Assoc Inc, Thomas Swan & Co Ltd, Toyoda Gosel Co Ltd, Xerox Palo Alto Res Ctr AB We have investigated two types of extended defects commonly found in AIN, GaN and InN films using density-functional techniques. First, basal-plane stacking faults have been studied for all three compounds. Stacking-fault energies were found to be largest in AIN and smallest in GaN consistent with density-functional results for their wurtzite/zinc-blende energy differences. In addition, the 4H and 6H structures were found to have lower energies than zinc blende for all three compounds. Second, we have investigated the electronic structure and formation energy for an edge dislocation in AIN. The full-core dislocation structure was found to have a filled electronic level approximately 0.55 eV above the valence-band edge and an empty level 1.4 eV below the conduction-band edge. An open-core structure was found to have filled and empty electronic levels closer to the middle of the energy gap. Formation energies for these two geometries suggest that the full-core structure would be expected to form in p-type material whereas both are expected in rt-type material. C1 Sandia Natl Labs, Semicond Mat & Device Sci Dept, Albuquerque, NM 87185 USA. RP Wright, AF (reprint author), Sandia Natl Labs, Semicond Mat & Device Sci Dept, POB 5800, Albuquerque, NM 87185 USA. NR 0 TC 2 Z9 2 U1 0 U2 2 PU MATERIALS RESEARCH SOCIETY PI WARRENDALE PA 506 KEYSTONE DRIVE, WARRENDALE, PA 15088-7563 USA SN 0272-9172 BN 1-55899-387-8 J9 MATER RES SOC SYMP P PY 1998 VL 482 BP 795 EP 804 PG 10 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Materials Science, Characterization & Testing; Materials Science, Coatings & Films SC Engineering; Materials Science GA BK98K UT WOS:000073983100120 ER PT S AU Doctor, SR AF Doctor, SR BE Crane, RL Achenbach, JD Shah, SP Matikas, TE KhuriYakub, PT Gilmore, RS TI Measurement challenges associated with irradiated reactor components SO NONDESTRUCTIVE CHARACTERIZATION OF MATERIALS IN AGING SYSTEMS SE MATERIALS RESEARCH SOCIETY SYMPOSIUM PROCEEDINGS LA English DT Proceedings Paper CT Symposium on Nondestructive Characterization of Materials in Aging Systems CY NOV 30-DEC 04, 1997 CL BOSTON, MA SP Mat Res Soc AB Nuclear reactor components are known to degrade as reactors age. The reactor pressure vessel and the reactor internals are subjected to the highest radiation fields and thus, age faster. Some boiling water reactors are experiencing extensive cracking of the core shroud and some pressurized water reactors are experiencing a reduction in their fracture toughness. This paper provides background information on reactor pressure vessel materials, fabrication, and construction practices. It identifies some of the challenges that are associated with the nondestructive measurement of changes in material properties associated with these components. The inspection environment, surface conditions and designs are also discussed. C1 Battelle Mem Inst, Pacific NW Labs, Engn Mech Measurement & NDE Grp, Richland, WA 99352 USA. RP Doctor, SR (reprint author), Battelle Mem Inst, Pacific NW Labs, Engn Mech Measurement & NDE Grp, POB 999, Richland, WA 99352 USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU MATERIALS RESEARCH SOCIETY PI WARRENDALE PA 506 KEYSTONE DRIVE, WARRENDALE, PA 15088-7563 USA SN 0272-9172 BN 1-55899-408-4 J9 MATER RES SOC SYMP P PY 1998 VL 503 BP 163 EP 168 PG 6 WC Engineering, Civil; Materials Science, Characterization & Testing SC Engineering; Materials Science GA BL56M UT WOS:000075897100022 ER PT S AU Thompson, RB Igarishi, B Alers, GA AF Thompson, RB Igarishi, B Alers, GA BE Crane, RL Achenbach, JD Shah, SP Matikas, TE KhuriYakub, PT Gilmore, RS TI Ultrasonic and magnetic techniques for materials characterization and embrittlement detection SO NONDESTRUCTIVE CHARACTERIZATION OF MATERIALS IN AGING SYSTEMS SE MATERIALS RESEARCH SOCIETY SYMPOSIUM PROCEEDINGS LA English DT Proceedings Paper CT Symposium on Nondestructive Characterization of Materials in Aging Systems CY NOV 30-DEC 04, 1997 CL BOSTON, MA SP Mat Res Soc AB This paper contains a brief description of recent research advances aimed at the nondestructive characterization of embrittlement, followed by a more detailed discussion of some recent results. The former includes recommendations in the areas of nondestructive evaluation and broader strategies for assessing embrittlement of irradiated reactor pressure vessel steels. The latter describes some very recent results in using measurements of dynamic magnetostriction to monitor the ultra fine scale microstructural changes associated with embrittlement. C1 Iowa State Univ Sci & Technol, Ames Lab, Ames, IA 50011 USA. RP Thompson, RB (reprint author), Iowa State Univ Sci & Technol, Ames Lab, Ames, IA 50011 USA. NR 0 TC 0 Z9 0 U1 1 U2 6 PU MATERIALS RESEARCH SOCIETY PI WARRENDALE PA 506 KEYSTONE DRIVE, WARRENDALE, PA 15088-7563 USA SN 0272-9172 BN 1-55899-408-4 J9 MATER RES SOC SYMP P PY 1998 VL 503 BP 193 EP 200 PG 8 WC Engineering, Civil; Materials Science, Characterization & Testing SC Engineering; Materials Science GA BL56M UT WOS:000075897100026 ER PT B AU Telschow, KL Deason, VA Ricks, KL Schley, RS AF Telschow, KL Deason, VA Ricks, KL Schley, RS BE Green, RE TI Photorefractive laser ultrasound spectroscopy for materials characterization SO NONDESTRUCTIVE CHARACTERIZATION OF MATERIALS VIII LA English DT Proceedings Paper CT 8th International Symposium on Nondestructive Characterization of Materials CY JUN 15-20, 1997 CL BOULDER, CO SP Amer Soc Nondestructive Testing, Fed Aviat Adm, Fed Highway Adm, NASA Langley Res Ctr, Natl Inst Stand & Technol, Natl Sci Fdn, USAF, Wright Labs, USN, Naval Surface Warfare Ctr C1 Lockheed Martin Idaho Technol Co, Idaho Natl Engn & Environm Lab, Idaho Falls, ID 83415 USA. RP Telschow, KL (reprint author), Lockheed Martin Idaho Technol Co, Idaho Natl Engn & Environm Lab, Idaho Falls, ID 83415 USA. RI Schley, Robert/B-9124-2017 OI Schley, Robert/0000-0001-8907-6535 NR 0 TC 0 Z9 0 U1 0 U2 2 PU PLENUM PRESS DIV PLENUM PUBLISHING CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA BN 0-306-45900-0 PY 1998 BP 79 EP 84 PG 6 WC Materials Science, Characterization & Testing SC Materials Science GA BL94P UT WOS:000077254000013 ER PT B AU Liu, YM Mitchell, TE Wadley, HNG AF Liu, YM Mitchell, TE Wadley, HNG BE Green, RE TI Application of laser-ultrasonic method to evaluate elastic stiffness degradation in ceramic matrix composites SO NONDESTRUCTIVE CHARACTERIZATION OF MATERIALS VIII LA English DT Proceedings Paper CT 8th International Symposium on Nondestructive Characterization of Materials CY JUN 15-20, 1997 CL BOULDER, CO SP Amer Soc Nondestructive Testing, Fed Aviat Adm, Fed Highway Adm, NASA Langley Res Ctr, Natl Inst Stand & Technol, Natl Sci Fdn, USAF, Wright Labs, USN, Naval Surface Warfare Ctr C1 Univ Calif Los Alamos Natl Lab, Ctr Mat Sci, Los Alamos, NM 87545 USA. RP Liu, YM (reprint author), Univ Calif Los Alamos Natl Lab, Ctr Mat Sci, Mail Stop K765, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU PLENUM PRESS DIV PLENUM PUBLISHING CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA BN 0-306-45900-0 PY 1998 BP 85 EP 90 PG 6 WC Materials Science, Characterization & Testing SC Materials Science GA BL94P UT WOS:000077254000014 ER PT B AU Buck, O Ojard, CG Barnard, DJ Rehbein, DK AF Buck, O Ojard, CG Barnard, DJ Rehbein, DK BE Green, RE TI NDE for strength determination of diffusion bonds SO NONDESTRUCTIVE CHARACTERIZATION OF MATERIALS VIII LA English DT Proceedings Paper CT 8th International Symposium on Nondestructive Characterization of Materials CY JUN 15-20, 1997 CL BOULDER, CO SP Amer Soc Nondestructive Testing, Fed Aviat Adm, Fed Highway Adm, NASA Langley Res Ctr, Natl Inst Stand & Technol, Natl Sci Fdn, USAF, Wright Labs, USN, Naval Surface Warfare Ctr C1 Iowa State Univ, Ames Lab, Ames, IA 50011 USA. RP Buck, O (reprint author), Iowa State Univ, Ames Lab, Ames, IA 50011 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU PLENUM PRESS DIV PLENUM PUBLISHING CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA BN 0-306-45900-0 PY 1998 BP 183 EP 188 PG 6 WC Materials Science, Characterization & Testing SC Materials Science GA BL94P UT WOS:000077254000029 ER PT B AU Sun, JG Haselkorn, MH Ellingson, WA AF Sun, JG Haselkorn, MH Ellingson, WA BE Green, RE TI Laser scattering detection of machining-induced damage in Si3N4 components SO NONDESTRUCTIVE CHARACTERIZATION OF MATERIALS VIII LA English DT Proceedings Paper CT 8th International Symposium on Nondestructive Characterization of Materials CY JUN 15-20, 1997 CL BOULDER, CO SP Amer Soc Nondestructive Testing, Fed Aviat Adm, Fed Highway Adm, NASA Langley Res Ctr, Natl Inst Stand & Technol, Natl Sci Fdn, USAF, Wright Labs, USN, Naval Surface Warfare Ctr C1 Argonne Natl Lab, Div Energy Technol, Argonne, IL 60439 USA. RP Sun, JG (reprint author), Argonne Natl Lab, Div Energy Technol, Argonne, IL 60439 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU PLENUM PRESS DIV PLENUM PUBLISHING CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA BN 0-306-45900-0 PY 1998 BP 365 EP 370 PG 6 WC Materials Science, Characterization & Testing SC Materials Science GA BL94P UT WOS:000077254000058 ER PT B AU Han, W Sinha, DN Springer, KN Lizon, DC AF Han, W Sinha, DN Springer, KN Lizon, DC BE Green, RE TI Noninvasive measurement of acoustic properties of fluids using an ultrasonic interferometry technique SO NONDESTRUCTIVE CHARACTERIZATION OF MATERIALS VIII LA English DT Proceedings Paper CT 8th International Symposium on Nondestructive Characterization of Materials CY JUN 15-20, 1997 CL BOULDER, CO SP Amer Soc Nondestructive Testing, Fed Aviat Adm, Fed Highway Adm, NASA Langley Res Ctr, Natl Inst Stand & Technol, Natl Sci Fdn, USAF, Wright Labs, USN, Naval Surface Warfare Ctr C1 Univ Calif Los Alamos Natl Lab, Elect & Electrochem Mat & Devices Grp, Los Alamos, NM 87545 USA. RP Han, W (reprint author), Univ Calif Los Alamos Natl Lab, Elect & Electrochem Mat & Devices Grp, POB 1663,MS D429, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU PLENUM PRESS DIV PLENUM PUBLISHING CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA BN 0-306-45900-0 PY 1998 BP 393 EP 399 PG 7 WC Materials Science, Characterization & Testing SC Materials Science GA BL94P UT WOS:000077254000062 ER PT B AU Somieski, B Meyendorf, N Kern, R Krause-Rehberg, R AF Somieski, B Meyendorf, N Kern, R Krause-Rehberg, R BE Green, RE TI Characterization of the microstructure of laser-hardened carbon steels by means of positron lifetime measurements and micromagnetics SO NONDESTRUCTIVE CHARACTERIZATION OF MATERIALS VIII LA English DT Proceedings Paper CT 8th International Symposium on Nondestructive Characterization of Materials CY JUN 15-20, 1997 CL BOULDER, CO SP Amer Soc Nondestructive Testing, Fed Aviat Adm, Fed Highway Adm, NASA Langley Res Ctr, Natl Inst Stand & Technol, Natl Sci Fdn, USAF, Wright Labs, USN, Naval Surface Warfare Ctr DE positron annihilation; micromagnetics; carbon steels; laser-hardening; microstructure; crystal lattice defects; martensite AB Pure carbon steels containing different amounts of carbon were laser-irradiated. This hardening process, caused by martensitic transformation due to high self-quenching rates, created microdefects that were revealed by positron lifetime spectroscopy and micromagnetic techniques. The dependence of the microstructure upon the laser-deposited energy is presented. Changes in the defect structure are discussed as a function of the material. The stability of the produced microdefects is analyzed by isochronal annealing. The opportunity to obtain more detailed information about the material behavior by comparing the results of the positron lifetime spectroscopy and the micromagnetic spectroscopy is discussed. C1 Oak Ridge Natl Lab, CASD, Oak Ridge, TN 37831 USA. RP Somieski, B (reprint author), Oak Ridge Natl Lab, CASD, Oak Ridge, TN 37831 USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU PLENUM PRESS DIV PLENUM PUBLISHING CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA BN 0-306-45900-0 PY 1998 BP 701 EP 706 PG 6 WC Materials Science, Characterization & Testing SC Materials Science GA BL94P UT WOS:000077254000110 ER PT B AU Stuckey, J Sun, JG Ellingson, WA AF Stuckey, J Sun, JG Ellingson, WA BE Green, RE TI Rapid infrared characterization of thermal diffusivity in continuous fiber ceramic composite components SO NONDESTRUCTIVE CHARACTERIZATION OF MATERIALS VIII LA English DT Proceedings Paper CT 8th International Symposium on Nondestructive Characterization of Materials CY JUN 15-20, 1997 CL BOULDER, CO SP Amer Soc Nondestructive Testing, Fed Aviat Adm, Fed Highway Adm, NASA Langley Res Ctr, Natl Inst Stand & Technol, Natl Sci Fdn, USAF, Wright Labs, USN, Naval Surface Warfare Ctr C1 Argonne Natl Lab, Div Energy Technol, Argonne, IL 60439 USA. RP Sun, JG (reprint author), Argonne Natl Lab, Div Energy Technol, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU PLENUM PRESS DIV PLENUM PUBLISHING CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA BN 0-306-45900-0 PY 1998 BP 805 EP 810 PG 6 WC Materials Science, Characterization & Testing SC Materials Science GA BL94P UT WOS:000077254000127 ER PT S AU Schilling, CH Gray, JN AF Schilling, CH Gray, JN BE Schilling, CH Gray, JN TI Needs and opportunities for NDE in ceramic processing SO NONDESTRUCTIVE EVALUATION OF CERAMICS SE CERAMIC TRANSACTIONS LA English DT Proceedings Paper CT Symposium on Nondestructive Evaluation of Ceramics, at the 99th Annual Meeting of the American-Ceramic-Society CY MAY 04-07, 1997 CL CINCINNATI, OH SP Amer Ceram Soc AB Post-fire defects in ceramics (e.g., cracks and warpage) can usually be traced to microstructure heterogeneities in the green state, e.g., isolated pores, packing-density gradients, and so on. Breakthroughs are needed in the way such heterogeneities are measured and understood during manufacturing, breakthroughs that could improve production efficiency and open up new markets for ceramic products. Traditional methods of quality-control are difficult to use when attempting to optimize the many different processing variables that ordinarily affect microstructure-defect evolution in ceramic production. These methods usually involve slow and costly trial-and-error procedures that are offline in nature. They generally do not provide enough information on the spatial- and temporal-evolution of green-microstructure defects from one unit operation to the next. In this paper, we discuss needs and opportunities for process monitoring sensors in ceramic manufacturing. We emphasize the need for a new generation of process development tools to provide a better, fundamental understanding of defect evolution during processing, tools that involve the combined use of manufacturing process simulations and NDE. C1 Iowa State Univ, Ames Lab, Ames, IA 50010 USA. RP Schilling, CH (reprint author), Iowa State Univ, Ames Lab, Ames, IA 50010 USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CERAMIC SOC PI WESTERVILLE PA 735 CERAMIC PLACE, WESTERVILLE, OH 43081-8720 USA SN 1042-1122 BN 1-57498-037-8 J9 CERAM TRANS PY 1998 VL 89 BP 1 EP 19 PG 19 WC Materials Science, Ceramics; Materials Science, Characterization & Testing SC Materials Science GA BL07M UT WOS:000074177600001 ER PT S AU Huss, SP Schilling, CH Gray, JN Maranville, CW AF Huss, SP Schilling, CH Gray, JN Maranville, CW BE Schilling, CH Gray, JN TI Recent advances in X-ray characterization of composites and tape cast ceramics SO NONDESTRUCTIVE EVALUATION OF CERAMICS SE CERAMIC TRANSACTIONS LA English DT Proceedings Paper CT Symposium on Nondestructive Evaluation of Ceramics, at the 99th Annual Meeting of the American-Ceramic-Society CY MAY 04-07, 1997 CL CINCINNATI, OH SP Amer Ceram Soc AB We have recently developed two prototype x-ray techniques for the nondestructive evaluation of ceramic tapes and composites: (i) x-ray radiography of tape casting defects, including tape thickness variations, surface pits, cracks, pores, bubbles, and density gradients, and (ii) energy-dispersive absorption spectroscopy for simultaneous mapping of composition and porosity in ceramic composites. These methods can both function as two-dimensional area detectors (rather than conventional point-or line-detectors), providing rapid statistical information on microstructure heterogeneities in flat sheets of ceramic material. Both techniques demonstrate the potential to serve as process development tools capable of inspecting both green and sintered materials. C1 Iowa State Univ, Ames Lab, Ames, IA 50010 USA. RP Huss, SP (reprint author), Iowa State Univ, Ames Lab, Ames, IA 50010 USA. NR 0 TC 2 Z9 2 U1 0 U2 0 PU AMER CERAMIC SOC PI WESTERVILLE PA 735 CERAMIC PLACE, WESTERVILLE, OH 43081-8720 USA SN 1042-1122 BN 1-57498-037-8 J9 CERAM TRANS PY 1998 VL 89 BP 45 EP 58 PG 14 WC Materials Science, Ceramics; Materials Science, Characterization & Testing SC Materials Science GA BL07M UT WOS:000074177600004 ER PT S AU Huss, SP Gray, JN Schilling, CH AF Huss, SP Gray, JN Schilling, CH BE Schilling, CH Gray, JN TI Fine scale resolution of ceramic microstructures by X-ray computed tomography: An economical approach SO NONDESTRUCTIVE EVALUATION OF CERAMICS SE CERAMIC TRANSACTIONS LA English DT Proceedings Paper CT Symposium on Nondestructive Evaluation of Ceramics, at the 99th Annual Meeting of the American-Ceramic-Society CY MAY 04-07, 1997 CL CINCINNATI, OH SP Amer Ceram Soc AB High-magnification, 3-dimensional imaging of ceramics by x-ray computed tomography (CT) typically requires use of a synchrotron and / or a massive array of solid-state detectors. The high cost of this research equipment generally limits its use as a process-development tool by ceramic manufacturers. In this paper, we demonstrate a more economical approach which produces image quality comparable to that of standard, high performance equipment. In this method we utilized an inexpensive image intensifier and applied techniques of frame averaging, gray-scale sub-ranging and other noise reduction and artifact removal methods in order to improve contrast sensitivity while maintaining low cost. After discussing critical factors affecting image quality, we discuss cost / performance tradeoffs associated with different CT equipment options. C1 Iowa State Univ, Ames Lab, Ames, IA 50010 USA. RP Huss, SP (reprint author), Iowa State Univ, Ames Lab, Ames, IA 50010 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CERAMIC SOC PI WESTERVILLE PA 735 CERAMIC PLACE, WESTERVILLE, OH 43081-8720 USA SN 1042-1122 BN 1-57498-037-8 J9 CERAM TRANS PY 1998 VL 89 BP 59 EP 66 PG 8 WC Materials Science, Ceramics; Materials Science, Characterization & Testing SC Materials Science GA BL07M UT WOS:000074177600005 ER PT S AU Garcia, VJ Schilling, CH AF Garcia, VJ Schilling, CH BE Schilling, CH Gray, JN TI Models relating ultrasonic velocity to the microstructures of green and sintered ceramics: A review SO NONDESTRUCTIVE EVALUATION OF CERAMICS SE CERAMIC TRANSACTIONS LA English DT Proceedings Paper CT Symposium on Nondestructive Evaluation of Ceramics, at the 99th Annual Meeting of the American-Ceramic-Society CY MAY 04-07, 1997 CL CINCINNATI, OH SP Amer Ceram Soc AB We review theoretical models which can be used in a practical setting to relate measurements of ultrasonic velocity to microstructural features of green and sintered ceramics. Features that are explicitly related include the particle coordination number, the specific surface area, and the packing density. We have rewritten some of the models and combined them with experimental results to obtain a general, power-law relation between the ultrasonic velocity and the reduction of specific surface area during sintering. C1 Iowa State Univ, Ames Lab, Ames, IA 50011 USA. RP Garcia, VJ (reprint author), Iowa State Univ, Ames Lab, Ames, IA 50011 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CERAMIC SOC PI WESTERVILLE PA 735 CERAMIC PLACE, WESTERVILLE, OH 43081-8720 USA SN 1042-1122 BN 1-57498-037-8 J9 CERAM TRANS PY 1998 VL 89 BP 67 EP 82 PG 16 WC Materials Science, Ceramics; Materials Science, Characterization & Testing SC Materials Science GA BL07M UT WOS:000074177600006 ER PT S AU Lance, MJ Haynes, JA Cannon, WR Ferber, MK AF Lance, MJ Haynes, JA Cannon, WR Ferber, MK BE Schilling, CH Gray, JN TI Piezospectroscopic characterization of thermal barrier coatings SO NONDESTRUCTIVE EVALUATION OF CERAMICS SE CERAMIC TRANSACTIONS LA English DT Proceedings Paper CT Symposium on Nondestructive Evaluation of Ceramics, at the 99th Annual Meeting of the American-Ceramic-Society CY MAY 04-07, 1997 CL CINCINNATI, OH SP Amer Ceram Soc AB A technique to measure stress non-destructively with a high spatial resolution using incoherent light scattering and luminescence is presented. The technique employs a Raman microprobe to measure small peak shifts in vibrational and electronic spectra which correlate to applied or residual stresses in the ceramic. The predicted frequency shift for a non-degenerate peak of polycrystalline alumina is estimated from single crystal phonon deformation potentials (PDPs) and secular equations by averaging over all crystal orientations. The predicted shift compares well to the experimentally measured shift. Thermal barrier coatings are analyzed to demonstrate the usefulness of the technique for solving unique mechanics problems in ceramics. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Lance, MJ (reprint author), Oak Ridge Natl Lab, POB 2008, Oak Ridge, TN 37831 USA. RI Lance, Michael/I-8417-2016 OI Lance, Michael/0000-0001-5167-5452 NR 0 TC 12 Z9 12 U1 0 U2 2 PU AMER CERAMIC SOC PI WESTERVILLE PA 735 CERAMIC PLACE, WESTERVILLE, OH 43081-8720 USA SN 1042-1122 BN 1-57498-037-8 J9 CERAM TRANS PY 1998 VL 89 BP 229 EP 237 PG 9 WC Materials Science, Ceramics; Materials Science, Characterization & Testing SC Materials Science GA BL07M UT WOS:000074177600019 ER PT S AU Riester, L Ferber, MK Breder, K AF Riester, L Ferber, MK Breder, K BE Schilling, CH Gray, JN TI Elastic modulus calculations from load/displacement curves using spherical and pointed indenters SO NONDESTRUCTIVE EVALUATION OF CERAMICS SE CERAMIC TRANSACTIONS LA English DT Proceedings Paper CT Symposium on Nondestructive Evaluation of Ceramics, at the 99th Annual Meeting of the American-Ceramic-Society CY MAY 04-07, 1997 CL CINCINNATI, OH SP Amer Ceram Soc AB Hard materials with known mechanical properties were probed with spherical and Berkovich indenters using a Nanoindenter(TM). A simple analysis of the loading portion of the indentation experiment was found to give reasonable estimates of the elastic modulus for a variety of brittle materials. C1 Oak Ridge Natl Lab, High Temp Mat Lab, Oak Ridge, TN 37831 USA. RP Riester, L (reprint author), Oak Ridge Natl Lab, High Temp Mat Lab, POB 2008, Oak Ridge, TN 37831 USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU AMER CERAMIC SOC PI WESTERVILLE PA 735 CERAMIC PLACE, WESTERVILLE, OH 43081-8720 USA SN 1042-1122 BN 1-57498-037-8 J9 CERAM TRANS PY 1998 VL 89 BP 337 EP 344 PG 8 WC Materials Science, Ceramics; Materials Science, Characterization & Testing SC Materials Science GA BL07M UT WOS:000074177600028 ER PT S AU Doctor, SR Schuster, GJ Pardini, AF AF Doctor, SR Schuster, GJ Pardini, AF BE Doctor, SR Lebowitz, CA Baaklini, GY TI SEPT inspections for developing empirical database of fabrication flaws in nuclear reactor pressure vessels SO NONDESTRUCTIVE EVALUATION OF MATERIALS AND COMPOSITES II SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT Conference on Nondestructive Evaluation of Materials and Composites II CY MAR 31-APR 01, 1998 CL SAN ANTONIO, TX SP Soc Photo Opt Instrumentat Engineers, Fed Aviat Adm, Nondestruct Testing Informat Anal Ctr, Fed Highway Adm, Natl Inst Stand & Technol, Lawrence Livermore Natl Lab, Def Adv Res Projects Agcy, Soc Exptl Mech, Japan Soc Mech Engineers, Japanese Soc Nondestruct Inspect, USAF Res Lab, Pressure Vessel Res Council, Gas Res Inst, Amer Soc Nondestruct Testing AB The Pacific Northwest National Laboratory (PNNL) is developing a methodology for estimating the size and density distribution of fabrication flaws in U.S. nuclear reactor pressure vessels. This involves the nondestructive evaluation (NDE) of reactor pressure vessel materials and the destructive validation of the flaws found. NDE has been performed on reactor pressure vessel material made by Babcock & Wilcox and Combustion Engineering. A metallographic analysis is being performed to validate the flaw density and size distributions estimated from the 2500 indications of fabrication flaws that were detected and characterized in the very sensitive SAFT-UT (synthetic aperture focusing technique for ultrasonic testing) inspection data from the Pressure Vessel Research User Facility (PVRUF) vessel at Oak Ridge National Laboratory. Research plans are also described for expanding the work to include other reactor pressure vessel materials. C1 Battelle Mem Inst, Pacific NW Labs, Richland, WA 99352 USA. RP Doctor, SR (reprint author), Battelle Mem Inst, Pacific NW Labs, MSIN K5-26, Richland, WA 99352 USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU SPIE-INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA SN 0277-786X BN 0-8194-2845-0 J9 P SOC PHOTO-OPT INS PY 1998 VL 3396 BP 74 EP 83 DI 10.1117/12.301507 PG 2 WC Materials Science, Ceramics; Materials Science, Characterization & Testing; Optics SC Materials Science; Optics GA BK61L UT WOS:000072738100009 ER PT S AU Gieske, JH Roach, DP Walkington, PD AF Gieske, JH Roach, DP Walkington, PD BE Doctor, SR Lebowitz, CA Baaklini, GY TI Ultrasonic inspection technique for composite doubler aluminum skin bond integrity for aircraft SO NONDESTRUCTIVE EVALUATION OF MATERIALS AND COMPOSITES II SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT Conference on Nondestructive Evaluation of Materials and Composites II CY MAR 31-APR 01, 1998 CL SAN ANTONIO, TX SP Soc Photo Opt Instrumentat Engineers, Fed Aviat Adm, Nondestruct Testing Informat Anal Ctr, Fed Highway Adm, Natl Inst Stand & Technol, Lawrence Livermore Natl Lab, Def Adv Res Projects Agcy, Soc Exptl Mech, Japan Soc Mech Engineers, Japanese Soc Nondestruct Inspect, USAF Res Lab, Pressure Vessel Res Council, Gas Res Inst, Amer Soc Nondestruct Testing DE ultrasonic inspection; nondestructive inspection; boron-epoxy composite; aircraft doubler; disbond detection; bond integrity; aging aircraft; aircraft repairs AB As part of the FAA's National Aging Aircraft Research Program to foster new technologies for civil aircraft maintenance and repair, use of bonded composite doublers on metal aircraft structures has been advanced. Research and validation of such doubler applications on U.S. certified commercial aircraft has begun. A specific composite application to assess the capabilities of composite doublers was chosen on a L-1011 aircraft for reinforcement of the corner of a cargo door frame where a boron-epoxy repair patch of up to 72 plies was installed. A primary inspection requirement for these doublers is the identification of disbonds between the composite laminate and the aluminum parent material. This paper describes the development of an ultrasonic pulse-echo technique using a modified immersion focus transducer where a robust signal amplitude signature of the composite/aluminum interface is obtained to characterize the condition of the bond. Example waveforms and C-scan images are shown to illustrate the ultrasonic response for various transducer configurations using a boron-epoxy/aluminum skin calibration test sample where disbonds and delaminations were built-in. The modified focus transducer is compatible with portable ultrasonic scanning systems that utilize the weeper or dripless bubbler technologies when an ultrasonic inspection of the boron-epoxy composite doublers installed on aircraft is implemented. C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Gieske, JH (reprint author), Sandia Natl Labs, MS0615, Albuquerque, NM 87185 USA. NR 0 TC 0 Z9 0 U1 1 U2 2 PU SPIE-INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA SN 0277-786X BN 0-8194-2845-0 J9 P SOC PHOTO-OPT INS PY 1998 VL 3396 BP 148 EP 155 DI 10.1117/12.301516 PG 2 WC Materials Science, Ceramics; Materials Science, Characterization & Testing; Optics SC Materials Science; Optics GA BK61L UT WOS:000072738100017 ER PT B AU Thomas, G Brown, A AF Thomas, G Brown, A BE Reuter, WG TI Ultrasonic evaluation of flood gate tendons SO NONDESTRUCTIVE EVALUATION OF UTILITIES AND PIPELINES II SE SPIE PROCEEDINGS SERIES LA English DT Proceedings Paper CT Conference on Nondestructive Evaluation of Utilities and Pipelines II CY APR 01, 1998 CL SAN ANTONIO, TX SP Int Soc Opt Engn, Fed Aviat Adm, Nondestruct Testing Informat Anal Ctr, Fed Highway Adm DE ultrasonic; nondestructive evaluation; flood gate; tendon AB Our water resources infrastructure is susceptible to aging degradation just like the rest of this country's infrastructure. A critical component of the water supply system is the flood gate that controls the outflow from dams. Long steel rods called tendons attach these radial gates to the concrete in the dam. The tendons are typically forty feet long and over one inch in diameter. Moisture may seep into the grout around the tendons and cause corrosion. Lawrence Livermore National Laboratory is working with the California Department of Water Resources to develop advanced ultrasonic techniques for nondestructively inspecting their tendons. A unique transducer was designed and fabricated to interrogate the entire tendon. A robust, portable unit was assembled that included a computer controlled data acquisition system and specialized data processing software to analyze the ultrasonic signals. This system was tested on laboratory specimens and is presently being fielded at two dam sites. C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Thomas, G (reprint author), Univ Calif Lawrence Livermore Natl Lab, POB 808,L-333, Livermore, CA 94550 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SPIE-INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA BN 0-8194-2847-7 J9 SPIE PROC SER PY 1998 VL 3398 BP 109 EP 114 DI 10.1117/12.302516 PG 6 WC Optics SC Optics GA BK72S UT WOS:000073225100013 ER PT B AU Tow, DM Reuter, WG AF Tow, DM Reuter, WG BE Reuter, WG TI Probabilistic model for pressure vessel reliability incorporating fracture mechanics and nondestructive examination SO NONDESTRUCTIVE EVALUATION OF UTILITIES AND PIPELINES II SE SPIE PROCEEDINGS SERIES LA English DT Proceedings Paper CT Conference on Nondestructive Evaluation of Utilities and Pipelines II CY APR 01, 1998 CL SAN ANTONIO, TX SP Int Soc Opt Engn, Fed Aviat Adm, Nondestruct Testing Informat Anal Ctr, Fed Highway Adm DE probabilistic fracture mechanics; nondestructive examination; structural reliability AB A probabilistic model has been developed for predicting the reliability of structures based on fracture mechanics and the results of nondestructive examination (NDE). The distinctive feature of this model is the way in which inspection results and the probability of detection (POD) curve are used to calculate a probability density function (PDF) for the number of flaws and the distribution of those flaws among the various size ranges. In combination with a probabilistic fracture mechanics model, this density function is used to estimate the probability of failure (POF) of a structure in which flaws have been detected by NDE. The model is useful for parametric studies of inspection techniques and material characteristics. C1 Idaho Natl Engn & Environm Lab, Idaho Falls, ID 83415 USA. RP Tow, DM (reprint author), Idaho Natl Engn & Environm Lab, POB 1625, Idaho Falls, ID 83415 USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU SPIE-INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA BN 0-8194-2847-7 J9 SPIE PROC SER PY 1998 VL 3398 BP 168 EP 176 DI 10.1117/12.302522 PG 9 WC Optics SC Optics GA BK72S UT WOS:000073225100019 ER PT B AU Rogers, RD Hamilton, MA Nelson, LO AF Rogers, RD Hamilton, MA Nelson, LO BE Reuter, WG TI Microbially influenced degradation of concrete structures SO NONDESTRUCTIVE EVALUATION OF UTILITIES AND PIPELINES II SE SPIE PROCEEDINGS SERIES LA English DT Proceedings Paper CT Conference on Nondestructive Evaluation of Utilities and Pipelines II CY APR 01, 1998 CL SAN ANTONIO, TX SP Int Soc Opt Engn, Fed Aviat Adm, Nondestruct Testing Informat Anal Ctr, Fed Highway Adm DE concrete; degradation; microorganisms; sulfur dioxide; sulfite; microbiological; bridges AB Steel reinforced concrete is the most widely used construction material in the world. The economic costs of repair or replacement of environmentally damaged concrete structures is astronomical. For example, half of the concrete bridges in the Federal Department of Transportation highway system are in need of major repairs. Microbially Influenced Degradation of concrete (MID) is one of the recognized degradative processes known to adversely affect concrete integrity. It is not possible to assign a specific percent of effect to any of these processes. However, MID has been shown to be as aggressive as any of the physical/chemical phenomena. In addition, the possibility exists that there is a synergism which results in cumulative effects from all the processes. Three groups of bacteria are known to promote MID. Of these, sulfur-oxidizing bacteria (SOB) are the most aggressive. Much is known about the nutritional needs of these bacteria. However, there has not been a biological linkage established between the presence of environmental, polluting sulfur sources and the degradation of concrete structures. It has been shown that the environmental pollutants sulfur dioxide and sulfite can be utilized by active SOB for the biological production of sulfuric acid. Therefore, it is not a reach of reality to assume that SOB exposed to these pollutants could have a major impact on the degradation of concrete structures. But, until the environment sulfur loop is closed it will not be possible to calculate how important SOB activity is in initiating and promoting damage. C1 Idaho Natl Engn & Environm Lab, Idaho Falls, ID 83415 USA. RP Rogers, RD (reprint author), Idaho Natl Engn & Environm Lab, MS 2203, Idaho Falls, ID 83415 USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU SPIE-INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA BN 0-8194-2847-7 J9 SPIE PROC SER PY 1998 VL 3398 BP 194 EP 199 DI 10.1117/12.302525 PG 6 WC Optics SC Optics GA BK72S UT WOS:000073225100022 ER PT S AU Nikravesh, M AF Nikravesh, M BE Berber, R Kravaris, C TI Artificial neural networks for nonlinear control of industrial processes SO NONLINEAR MODEL BASED PROCESS CONTROL SE NATO ADVANCED SCIENCE INSTITUTES SERIES, SERIES E, APPLIED SCIENCES LA English DT Proceedings Paper CT NATO Advanced Study Institute on Nonlinear Model Based Process Control CY AUG 10-20, 1997 CL ANTALYA, TURKEY SP NATO, Sci Affairs Div, Natl Adm NATO ASIs in Turkey, Greece & Portugal, Natl Sci Fdn, US AB In this paper, the state-of-the-art methodology for model identification and control of fluid injection into petroleum reservoir is presented. The methodology uses several techniques: Dynamic Neural Network Control (DNNC) network structure, neuro-statistical (neural network, conventional statistical, and non-parametric statistical such as ACE; Alternative Conditional Expectation) techniques, Geometric Model-Based Control Strategy, and stability analysis techniques such as Liapunov theory. In this study, the DNNC model is used because it is much easier to update and adapt the network on-line. The neuro-statistical technique is used because the model can deal with uncertainty in data. The neuro-statistical model uses neural network techniques, since the functional structure of the data is unknown and use's statistical technique because the data and our requirements are imperfect. In addition, this technique in conjunction with Levenberge-Marquardt algorithm can be used as a more robust technique for network training and optimization purposes. The ACE technique is used for scaling the network's input-output data and can be used to find the input structure of the network. The result from Liapunov theory is used to find optimal neural network structure. In addition, a special neural network structure is used to insure the stability of the network for long-term prediction. In this model, the current information from the input layer is presented into a pseudo hidden layer. This model minimizes not only the conventional error in the output layer but also minimizes the filtered value of the output. This technique is a trade off between the accuracy of the actual and filtered prediction which will result in the stability of the long-term prediction of the network model. In this paper, an optimal neural network controller will be designed for a well-head controller for steam injection into low permeability petroleum reservoirs for oil displacement. C1 Lawrence Berkeley Lab, ESD, Berkeley, CA 94706 USA. RP Nikravesh, M (reprint author), Lawrence Berkeley Lab, ESD, Berkeley, CA 94706 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER PI DORDRECHT PA PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0168-132X BN 0-7923-5220-3 J9 NATO ADV SCI I E-APP PY 1998 VL 353 BP 831 EP 869 PG 39 WC Automation & Control Systems; Engineering, Chemical SC Automation & Control Systems; Engineering GA BM07J UT WOS:000077547300027 ER PT B AU Jellinek, J Krissinel, EB AF Jellinek, J Krissinel, EB BE Rao, BK Behera, SN TI Nickel-aluminum alloy clusters: Structures, energetics, and dynamics SO NOVEL MATERIALS DESIGN AND PROPERTIES LA English DT Proceedings Paper CT International Conference on Novel Materials CY MAR 03-07, 1997 CL PURI, INDIA SP Inst Phys, Bhubaneswar, India, Virginia Commonwealth Univ, Dept Phys, Richmond, Indo US Sci & Technol Collaborat Program, USN, Naval Res Lab, Washington, DC, S N Bose Natl Ctr Basic Sci, Calcutta, India, Govt India, Dept Sci & Technol, New Delhi, India, USN, Off Naval Res AB Results of computational studies of Ni,AI, alloy clusters, for all possible compositions (n, m) such that n+m=13, are presented and discussed. These include structural and energy characteristics, an analysis of mixing of the two components and of its role in defining the hierarchy of the structural forms, and a description of the peculiarities of the dynamical features as defined by the cluster composition. New definitions of mixing energy and mixing coefficient, applicable to systems described by either many-body (as is the case for metals) or pairwise-additive potentials, are introduced and used to quantify the degree of mixing. It is shown that the clusters undergo a stage-wise solid-to-liquid-like transition as their energy is increased. The nature of the stages of the transition depends on the composition of the cluster. C1 Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. RP Jellinek, J (reprint author), Argonne Natl Lab, Div Chem, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU NOVA SCIENCE PUBLISHERS, INC PI HAUPPAUGE PA 400 OSER AVE, STE 1600, HAUPPAUGE, NY 11788-3635 USA BN 1-56072-559-1 PY 1998 BP 83 EP 98 PG 16 WC Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA BK82T UT WOS:000073537500008 ER PT B AU Voter, AF AF Voter, AF BE Rao, BK Behera, SN TI Accelerated molecular dynamics simulation of materials defects with the hyper-MD method SO NOVEL MATERIALS DESIGN AND PROPERTIES LA English DT Proceedings Paper CT International Conference on Novel Materials CY MAR 03-07, 1997 CL PURI, INDIA SP Inst Phys, Bhubaneswar, India, Virginia Commonwealth Univ, Dept Phys, Richmond, Indo US Sci & Technol Collaborat Program, USN, Naval Res Lab, Washington, DC, S N Bose Natl Ctr Basic Sci, Calcutta, India, Govt India, Dept Sci & Technol, New Delhi, India, USN, Off Naval Res AB Molecular dynamics (MD) is a powerful tool for investigating detailed atomic-scale behavior. However, the accessible time scales are limited to nanoseconds, so that many processes of interest are simply out of reach. Often, the dynamics of slower processes are characterized by infrequent-events, i.e., the system makes an occasional transition from one metastable state to another. Examples include surface or bulk diffusion, thermal dislocation dynamics, or fracture at low strain rates. When the nature of the transition is understood, transition state theory (TST) can be used to compute the exact rate constant without dynamics. However, in many cases, the reactive events that will occur are not known in advance, or the transition states are extremely complicated. We discuss a new method, "hyper-MD," for treating this type of case in the solid state. The method works in continuous space and makes no assumptions about the nature of the transition states. Substantial time scale enhancements appear possible. As an example, the diffusion of an Ag adatom on the Ag(100) surface is examined in a 10 mu s simulation. C1 Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. RP Voter, AF (reprint author), Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. OI Voter, Arthur/0000-0001-9788-7194 NR 0 TC 0 Z9 0 U1 0 U2 3 PU NOVA SCIENCE PUBLISHERS, INC PI HAUPPAUGE PA 400 OSER AVE, STE 1600, HAUPPAUGE, NY 11788-3635 USA BN 1-56072-559-1 PY 1998 BP 277 EP 290 PG 14 WC Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA BK82T UT WOS:000073537500023 ER PT B AU Mueller, PG AF Mueller, PG GP ORG ECON COOPERAT & DEV ORG ECON COOPERAT & DEV TI The United States federal monitoring and assessment centre and radiological database management SO NUCLEAR EMERGENCY DATA MANAGEMENT SE OECD PROCEEDINGS LA English DT Proceedings Paper CT International Workshop on Nuclear Emergency Data Management CY SEP 13-14, 1995 CL ZURICH, SWITZERLAND SP Org Econ Cooperat & Dev, Nucl Energy Agcy, Comm Radiat Protect & Public Hlth, Swiss Natl Emergency Operat Ctr C1 US DOE, FRMAC, Las Vegas, NV 89193 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ORGANIZATION ECONOMIC COOPERATION & DEVELOPMENT PI PARIS PA 2, RUE ANDRE PASCAL, CEDEX 16, 75775 PARIS, FRANCE BN 92-64-16037-X J9 OECD PROC PY 1998 BP 27 EP 30 PG 4 WC International Relations SC International Relations GA BL73S UT WOS:000076503000002 ER PT B AU Best, RG Doyle, JF Mueller, PG AF Best, RG Doyle, JF Mueller, PG GP ORG ECON COOPERAT & DEV ORG ECON COOPERAT & DEV TI Application of geographic information system for radiologic emergency response SO NUCLEAR EMERGENCY DATA MANAGEMENT SE OECD PROCEEDINGS LA English DT Proceedings Paper CT International Workshop on Nuclear Emergency Data Management CY SEP 13-14, 1995 CL ZURICH, SWITZERLAND SP Org Econ Cooperat & Dev, Nucl Energy Agcy, Comm Radiat Protect & Public Hlth, Swiss Natl Emergency Operat Ctr C1 EG&G Energy Measurements Inc, US DOE, Remote Sensing Lab, Las Vegas, NV 89125 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ORGANIZATION ECONOMIC COOPERATION & DEVELOPMENT PI PARIS PA 2, RUE ANDRE PASCAL, CEDEX 16, 75775 PARIS, FRANCE BN 92-64-16037-X J9 OECD PROC PY 1998 BP 223 EP 228 PG 6 WC International Relations SC International Relations GA BL73S UT WOS:000076503000024 ER PT B AU Sullivan, TJ AF Sullivan, TJ GP ORG ECON COOPERAT & DEV ORG ECON COOPERAT & DEV TI Data management in the "ARAC" emergency response system SO NUCLEAR EMERGENCY DATA MANAGEMENT SE OECD PROCEEDINGS LA English DT Proceedings Paper CT International Workshop on Nuclear Emergency Data Management CY SEP 13-14, 1995 CL ZURICH, SWITZERLAND SP Org Econ Cooperat & Dev, Nucl Energy Agcy, Comm Radiat Protect & Public Hlth, Swiss Natl Emergency Operat Ctr AB This paper is intended to describe the emergency management community the 20-year operational history of the Atmospheric Release Advisory Capability (ARAC) program, its concept of operations, and its applicability for use in support of emergency management decision makers with an emphasis on the data management aspects. ARAC is a centralised US federal funded program for assessing atmospheric releases of hazardous materials in real time, using a robust suite of three-dimensional atmospheric transport and diffusion models, extensive geophysical and source-description databases, automated meteorological data acquisition systems, and experienced staff members. Although originally conceived to respond to nuclear accidents, the ARAC system has proven to be extremely adaptable, and has been used successfully during a wide variety of nonradiological hazardous chemical situations. ARAC represents a proven, validated, operational support capability for atmospheric hazardous releases. C1 Univ Calif Lawrence Livermore Natl Lab, Atmospher Release Advisory Capabil, Livermore, CA 94550 USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU ORGANIZATION ECONOMIC COOPERATION & DEVELOPMENT PI PARIS PA 2, RUE ANDRE PASCAL, CEDEX 16, 75775 PARIS, FRANCE BN 92-64-16037-X J9 OECD PROC PY 1998 BP 237 EP 247 PG 11 WC International Relations SC International Relations GA BL73S UT WOS:000076503000026 ER PT J AU Jaeger, EF Carter, MD Berry, LA Batchelor, DB Forest, CB Weitzner, H AF Jaeger, EF Carter, MD Berry, LA Batchelor, DB Forest, CB Weitzner, H TI Co-counter asymmetry in fast wave heating and current drive SO NUCLEAR FUSION LA English DT Article AB Different plasma responses to neutral beam injection in the directions co and counter to the plasma current have long been accepted as well understood in neutral beam heating of tokamak plasmas. Differences can also occur in fast wave heating and current drive in the ion cyclotron range of frequencies (ICRF) when antenna arrays are phased to drive current co and counter to the plasma current. The source of this asymmetry can be easily seen in the cold plasma wave equation with an applied magnetic field in the z direction and the parallel ICRF electric field set to zero (small electron mass limit). In the absence of absorption, the wave equation displays perfect up-down symmetry. However, when absorption is introduced, the up-down symmetry is destroyed by Hall terms, which depend on density and magnetic field gradients. This is confirmed by simple numerical solutions of the cold plasma wave equation with and without collisions. The same up-down asymmetry appears in three dimensional (3-D) antenna coupling calculations with outgoing boundary conditions. These show a natural poloidal shift in the antenna's radiated power spectrum even when no poloidal magnetic field is present. When a poloidal magnetic field is introduced, the up-down asymmetry acquires a toroidal component. This leads to differences in electron heating and current drive depending on the direction that fast waves are launched relative to the plasma current. Such differences are clearly seen in full wave modelling calculations of heating and current drive in NSTX, where poloidal and toroidal magnetic fields are comparable in magnitude near the antenna. When density gradients are forced to zero, both up-down and co-counter asymmetries disappear. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. NYU, Courant Inst Math Sci, New York, NY 10012 USA. Gen Atom, RF Phys & Technol Div, San Diego, CA 92138 USA. RP Jaeger, EF (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. NR 14 TC 17 Z9 17 U1 0 U2 0 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5, PO BOX 100, A-1400 VIENNA, AUSTRIA SN 0029-5515 J9 NUCL FUSION JI Nucl. Fusion PD JAN PY 1998 VL 38 IS 1 BP 1 EP 12 DI 10.1088/0029-5515/38/1/301 PG 12 WC Physics, Fluids & Plasmas SC Physics GA 195XK UT WOS:000080277300001 ER PT J AU Ehst, DA Kessel, CE Krakowski, RA Bathke, CG Jardin, SC Mau, TK Najmabadi, F AF Ehst, DA Kessel, CE Krakowski, RA Bathke, CG Jardin, SC Mau, TK Najmabadi, F TI Economic comparison of MHD equilibrium options for advanced steady state tokamak power plants SO NUCLEAR FUSION LA English DT Article ID DIII-D TOKAMAK; HIGH-PERFORMANCE; MAGNETIC SHEAR; BOOTSTRAP CURRENT; CONFINEMENT; GENERATION; DISCHARGES; REACTORS; BETA AB Progress in theory and in tokamak experiments leads to questions of the optimal development path for commercial tokamak power plants. The economic prospects of future designs are compared for several tokamak operating modes: (high poloidal beta) first stability, second stability and reverse shear. Using a simplified economic model and selecting uniform engineering performance parameters, this comparison emphasizes the different physics characteristics - stability and noninductive current drive - of the various equilibria. The reverse shear mode of operation is shown to offer the lowest cost of electricity for future pou er plants. C1 Argonne Natl Lab, Argonne, IL 60439 USA. Princeton Univ, Princeton Plasma Phys Lab, Princeton, NJ 08543 USA. Univ Calif Los Alamos Natl Lab, Los Alamos, NM USA. Univ Calif San Diego, Fus Energy Res Program, San Diego, CA 92103 USA. RP Ehst, DA (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. RI Jardin, Stephen/E-9392-2010 NR 33 TC 8 Z9 8 U1 0 U2 2 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5, PO BOX 100, A-1400 VIENNA, AUSTRIA SN 0029-5515 J9 NUCL FUSION JI Nucl. Fusion PD JAN PY 1998 VL 38 IS 1 BP 13 EP 29 DI 10.1088/0029-5515/38/1/302 PG 17 WC Physics, Fluids & Plasmas SC Physics GA 195XK UT WOS:000080277300002 ER PT J AU Bernabei, S Cardinali, A Giruzzi, G Zabiego, M AF Bernabei, S Cardinali, A Giruzzi, G Zabiego, M TI Tearing mode stabilization in tokamaks with lower hybrid waves SO NUCLEAR FUSION LA English DT Article ID CURRENT DRIVE; SUPPRESSION; TFTR; M=2 AB The possibility of using lower hybrid (LH) waves as a source of localized current for the control of MHD instabilities is investigated. A toroidal ray tracing code is used to define the requirements on the launched wave spectrum, in order to drive currents mostly localized inside the magnetic islands. Issues such as the radial diffusion of the non-inductive current. the impact of the radial profile of the power deposition on the stabilization process, the finite time response of the current to RF power modulations and its interplay with the island rotation ale addressed by means of a three dimensional (3-D) Fokker-Planck code. It is shown that lower hybrid current drive (LHCD) is a viable option for the control of m. = 2 tearing modes in present medium to large tokamaks: the method would be particularly effective in a reactor size machine. C1 Princeton Univ, Princeton Plasma Phys Lab, Princeton, NJ 08543 USA. EURATOM Assoc, ENEA Fus, Ctr Ric Energia Frascati, Frascati, Italy. EURATOM Assoc, CEA Fus, Dept Rech Fus Controlee, Ctr Etudes Cadarache, St Paul Durance, France. RP Bernabei, S (reprint author), Princeton Univ, Princeton Plasma Phys Lab, POB 451, Princeton, NJ 08543 USA. NR 28 TC 8 Z9 8 U1 2 U2 4 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5, PO BOX 100, A-1400 VIENNA, AUSTRIA SN 0029-5515 J9 NUCL FUSION JI Nucl. Fusion PD JAN PY 1998 VL 38 IS 1 BP 87 EP 92 DI 10.1088/0029-5515/38/1/307 PG 6 WC Physics, Fluids & Plasmas SC Physics GA 195XK UT WOS:000080277300007 ER PT J AU Hoang, GT Saoutic, B Guiziou, L Basiuk, V Becoulet, A Budny, RV Clairet, F Colas, L Devynck, P Gil, C Joffrin, E Litaudon, X Segui, JL Voitsekhovitch, I Zou, XL AF Hoang, GT Saoutic, B Guiziou, L Basiuk, V Becoulet, A Budny, RV Clairet, F Colas, L Devynck, P Gil, C Joffrin, E Litaudon, X Segui, JL Voitsekhovitch, I Zou, XL TI Magnetic smear effects on confinement and electron heat transport in Tore Supra discharges with electron heating SO NUCLEAR FUSION LA English DT Article ID ENHANCED PERFORMANCE; ENERGY CONFINEMENT; CURRENT DRIVE; TOKAMAK; SHEAR; TURBULENCE; TFTR; PLASMAS; BETA; JET AB Various steady state non-inductive plasmas, with strong electron heating and significant modification of the current density profile, have been routinely obtained in Tore Supra discharges with lower hybrid current drive (LHCD) and/or fast wave electron heating (FWEH) experiments. The dependence of the electron heat diffusivity chi(e) on the electron temperature gradient del T-e, the magnetic shear s and the safety factor q is demonstrated. The increase of chi(e) with del T-e indicates the existence of a critical temperature gradient. Moreover, the current density profile affects the global confinement and the local transport. The electron heat flux q(e) is found to be roughly proportional to q(2). The effect of magnetic shear on chi(e) is studied in the improved confinement discharges obtained by modifying the current profile. When the magnetic shear increases in the confinement zone and/or vanishes in she plasma centre, chi(e) decreases. The effect of the current profile is also observed in the saturated ohmic regime. The results for chi(e) do not agree with the local transport models of Taroni et al, ol Rebut-Lallia-Watkins (RLW) for all ranges of electron heating. C1 EURATOM Assoc, CEA, Dept Rech Fus Controlee, CEA Cadarache, St Paul Durance, France. Princeton Univ, Princeton Plasma Phys Lab, Princeton, NJ 08543 USA. RP Hoang, GT (reprint author), EURATOM Assoc, CEA, Dept Rech Fus Controlee, CEA Cadarache, St Paul Durance, France. NR 38 TC 49 Z9 49 U1 0 U2 5 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5, PO BOX 100, A-1400 VIENNA, AUSTRIA SN 0029-5515 J9 NUCL FUSION JI Nucl. Fusion PD JAN PY 1998 VL 38 IS 1 BP 117 EP 132 DI 10.1088/0029-5515/38/1/311 PG 16 WC Physics, Fluids & Plasmas SC Physics GA 195XK UT WOS:000080277300011 ER PT J AU Knoll, DA AF Knoll, DA TI Computational study of ITER-like dissipative divertor plasmas in the collisional limit SO NUCLEAR FUSION LA English DT Article ID SIMULATION; EDGE; TRANSPORT; EQUATIONS; MODEL AB A two dimensional (2-D) combined edge plasma/Navier-Stokes neutral transport model is used in a computational study of dissipative divertor plasmas in the collisional limit for neutrals, with ITER-like plasma conditions and scale lengths. The neutral model contains three momentum equations that are coupled to the plasma through ionization, recombination and ion-neutral elastic collisions. The neutral transport coefficients are evaluated including both ion-neutral and neutral-neutral collisions. The structure of fully detached plasma solutions is studied for ITER plasma conditions. These detached solutions are obtained through a combination of impurity radiation, from a simplified impurity model, and neutral flow baffling. Solution sensitivities are elucidated to: (a) baffle location, (b) upstream plasma density and Lyman-cr opacity, (c) volume recombination and (d) neutral-neutral collisions. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87544 USA. RP Knoll, DA (reprint author), Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87544 USA. NR 22 TC 4 Z9 4 U1 0 U2 0 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5, PO BOX 100, A-1400 VIENNA, AUSTRIA SN 0029-5515 J9 NUCL FUSION JI Nucl. Fusion PD JAN PY 1998 VL 38 IS 1 BP 133 EP 146 DI 10.1088/0029-5515/38/1/312 PG 14 WC Physics, Fluids & Plasmas SC Physics GA 195XK UT WOS:000080277300012 ER PT J AU Chen, T Irwin, J Siemann, RH AF Chen, T Irwin, J Siemann, RH TI High-order horizontal resonances in the beam-beam interaction SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article DE beam-beam interaction; lifetime; resonances AB This paper studies the characteristics of horizontal resonances excited by the beam-beam interaction. First-order perturbation theory and simulations show that high-order horizontal resonances are exceptionally strong at large amplitudes. The orders of these resonances are so high that they may mistakenly be ignored, and they can result in a short lifetime. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Siemann, RH (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, MS26,POB 4349, Stanford, CA 94309 USA. NR 5 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JAN 1 PY 1998 VL 402 IS 1 BP 21 EP 26 DI 10.1016/S0168-9002(97)01072-3 PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA YR237 UT WOS:000071474700003 ER PT J AU Baarmand, MM Bonushkin, Y Chrisman, D Durkin, S Ferguson, T Giacomelli, P Gorn, L Gorn, W Hauser, J Hirschfelder, J Hoftiezer, J Hoorani, H Kisselev, O Klem, DE Korytov, A Layter, JG Lennous, P Ling, TY Matthey, C Medved, S Minor, C Mitselmakher, G Muller, T Otwinowski, S Preston, L Prokofiev, O Rush, C Schenk, P Sedykh, Y Smirnov, I Soulimov, V Vaniachine, A Vercelli, T von Goeler, E Wuest, C Zeng, J AF Baarmand, MM Bonushkin, Y Chrisman, D Durkin, S Ferguson, T Giacomelli, P Gorn, L Gorn, W Hauser, J Hirschfelder, J Hoftiezer, J Hoorani, H Kisselev, O Klem, DE Korytov, A Layter, JG Lennous, P Ling, TY Matthey, C Medved, S Minor, C Mitselmakher, G Muller, T Otwinowski, S Preston, L Prokofiev, O Rush, C Schenk, P Sedykh, Y Smirnov, I Soulimov, V Vaniachine, A Vercelli, T von Goeler, E Wuest, C Zeng, J TI Tests of cathode strip chamber prototypes SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB We report on the results of testing two six-layer 0.6 x 0.6 m(2) cathode strip chamber (CSC) prototypes in a muon beam at CERN. The prototypes were designed to simulate sections of the end-cap muon system of the Compact Muon Solenoid (CMS) detector which will be installed at the Large Hadron Collider (LHC). We measured the spatial and time resolutions of each chamber for different gains, different orientations with respect to the beam direction and different strength magnetic fields, The single-layer spatial resolution of a prototype with a strip pitch of 15.58 mm ranged from 78 to 468 mu m, depending on whether the particle passed between two cathode strips or through the center of a strip; its six-layer resolution was found to be 44 mu m. The single-layer spatial resolution of a prototype with a strip pitch of 6.35 mm ranged from 54 to 66 mu m; its six-layer resolution was found to be 23 mu m. The efficiency for collecting an anode wire signal from one of six layers within a 20 ns time window appropriate for the LHC was found to be greater than 95% in normal running conditions. C1 SUNY Stony Brook, Stony Brook, NY 11790 USA. Univ Calif Los Angeles, Los Angeles, CA 90024 USA. Univ Calif Riverside, Riverside, CA 92521 USA. Ohio State Univ, Athens, OH 45701 USA. Carnegie Mellon Univ, Pittsburgh, PA 15213 USA. Petersburg Nucl Phys Inst, St Petersburg, Russia. Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. Univ Florida, Gainesville, FL 32611 USA. Purdue Univ, W Lafayette, IN 47907 USA. Joint Nucl Res Inst, Dubna, Moscow Region, Russia. Northeastern Univ, Boston, MA 02115 USA. RP Chrisman, D (reprint author), CERN, PPE, CH-1211 Geneva 23, Switzerland. RI Giacomelli, Paolo/B-8076-2009; Vanyashin, Aleksandr/H-7796-2013; Ferguson, Thomas/O-3444-2014; Hoorani, Hafeez/D-1791-2013; OI Vanyashin, Aleksandr/0000-0002-0367-5666; Ferguson, Thomas/0000-0001-5822-3731; Baarmand, Marc/0000-0002-9792-8619; Giacomelli, Paolo/0000-0002-6368-7220 NR 8 TC 6 Z9 6 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JAN 1 PY 1998 VL 402 IS 1 BP 36 EP 52 DI 10.1016/S0168-9002(97)01075-9 PG 17 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA YR237 UT WOS:000071474700005 ER PT J AU Reeder, PL Peurrung, AJ Richey, WC Chen-Mayer, HH Sharov, VA Fokin, V Mildner, DFR AF Reeder, PL Peurrung, AJ Richey, WC Chen-Mayer, HH Sharov, VA Fokin, V Mildner, DFR TI Imaging neutron beams with scintillating fiber faceplates SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article DE neutron imaging; scintillating fibers AB An imaging system for neutron beams based on scintillating fiber faceplates is described. The scintillating fibers are made from lithium silicate glass doped with Ce3+ using isotopically enriched Li-6. Several faceplates ranging;in thickness from 1.3 to 3.2 mm have been tested using a position-sensitive photomultiplier or a Charge Injection Device camera as the photodetector. Advantages of scintillating fiber faceplates include high neutron capture efficiency, good position resolution, and the possibility of low-cost, large-area detectors. C1 Pacific NW Lab, Richland, WA 99352 USA. Natl Inst Stand & Technol, Gaithersburg, MD 20899 USA. RP Reeder, PL (reprint author), Pacific NW Lab, POB 999, Richland, WA 99352 USA. NR 8 TC 3 Z9 3 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JAN 1 PY 1998 VL 402 IS 1 BP 155 EP 163 DI 10.1016/S0168-9002(97)01074-7 PG 9 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA YR237 UT WOS:000071474700016 ER PT J AU Parks, DC Stockli, MP Bell, EW Ratliff, LP Schmieder, RW Serpa, FG Gillaspy, JD AF Parks, DC Stockli, MP Bell, EW Ratliff, LP Schmieder, RW Serpa, FG Gillaspy, JD TI Non-kinetic damage on insulating materials by highly charged ion bombardment SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article DE highly charged ion; surface damage; AFM; Coulomb explosion; EBIT; EBIS ID METAL-SURFACE; ELECTRON-EMISSION; SOLID-SURFACES; STATE IONS; SLOW; NEUTRALIZATION; ENERGY; IMPACT; MICA AB We have measured the damage caused by the impact of low velocity, highly charged ions on insulating surfaces. Atomic force microscopy allows us to observe directly the surface topography with nanometer resolution. Using constant velocity (100 keV) Xe7+ ions (25 less than or equal to less than or equal to 50) impinging on mica, we observe damage caused by single ion impacts. Impact sites typically are circular hillocks. Within the range and accuracy of the data, the height and volume of the damaged regions are well approximated by a linear function of ion potential energy. (C) 1998 Elsevier Science B.V. C1 Natl Inst Stand & Technol, Atom Phys Div, Gaithersburg, MD 20899 USA. Kansas State Univ, Dept Phys, JR Macdonald Lab, Manhattan, KS 66506 USA. Diamond Semicond Grp, Gloucester, MA 01930 USA. Sandia Natl Labs, Livermore, CA 94551 USA. Univ Notre Dame, Dept Phys, Notre Dame, IN 46556 USA. RP Parks, DC (reprint author), Natl Inst Stand & Technol, Atom Phys Div, Gaithersburg, MD 20899 USA. NR 24 TC 42 Z9 44 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD JAN PY 1998 VL 134 IS 1 BP 46 EP 52 DI 10.1016/S0168-583X(98)80032-3 PG 7 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA YR238 UT WOS:000071474800006 ER PT B AU Witmer, FE AF Witmer, FE BE Peddicord, KL Lazarev, LN Jardine, LJ TI Relationship of past US/RF nuclear material safety management activities to workshop goals SO NUCLEAR MATERIALS SAFETY MANAGEMENT SE NATO ADVANCED SCIENCE INSTITUTE SERIES, SUB-SERIES 1: DISARMAMENT TECHNOLOGIES LA English DT Proceedings Paper CT NATO Advanced Research Workshop on Nuclear Materials Safety Management CY MAR 17-21, 1997 CL AMARILLO, TX SP NATO, US DOE, Off Def Programs, Texas Engn Expt Stn, Minist Russian Federat Atom Energy, Amarillo Natl Resource Ctr Plutonium C1 US Dept Energy, Germantown, MD 20874 USA. RP Witmer, FE (reprint author), US Dept Energy, DP-45,19901 Germantown Rd, Germantown, MD 20874 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER PI DORDRECHT PA PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS BN 0-7923-5191-6 J9 NATO SCI S 1 DISARM PY 1998 VL 20 BP 5 EP 12 PG 8 WC Physics, Nuclear SC Physics GA BL79Q UT WOS:000076772400002 ER PT B AU Krumpe, PF AF Krumpe, PF BE Peddicord, KL Lazarev, LN Jardine, LJ TI Toward an integrated nuclear materials safety management approach in the United States and Russia SO NUCLEAR MATERIALS SAFETY MANAGEMENT SE NATO ADVANCED SCIENCE INSTITUTE SERIES, SUB-SERIES 1: DISARMAMENT TECHNOLOGIES LA English DT Proceedings Paper CT NATO Advanced Research Workshop on Nuclear Materials Safety Management CY MAR 17-21, 1997 CL AMARILLO, TX SP NATO, US DOE, Off Def Programs, Texas Engn Expt Stn, Minist Russian Federat Atom Energy, Amarillo Natl Resource Ctr Plutonium C1 US DOE, Special Projects Grp, Off Associate Deputy Assistant Secretary Tech & E, Def Programs, Washington, DC 20585 USA. RP Krumpe, PF (reprint author), US DOE, Special Projects Grp, Off Associate Deputy Assistant Secretary Tech & E, Def Programs, Washington, DC 20585 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER PI DORDRECHT PA PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS BN 0-7923-5191-6 J9 NATO SCI S 1 DISARM PY 1998 VL 20 BP 13 EP 21 PG 9 WC Physics, Nuclear SC Physics GA BL79Q UT WOS:000076772400003 ER PT B AU Jardine, LJ AF Jardine, LJ BE Peddicord, KL Lazarev, LN Jardine, LJ TI Implementing a nuclear materials safety management program in the US and Russia SO NUCLEAR MATERIALS SAFETY MANAGEMENT SE NATO ADVANCED SCIENCE INSTITUTE SERIES, SUB-SERIES 1: DISARMAMENT TECHNOLOGIES LA English DT Proceedings Paper CT NATO Advanced Research Workshop on Nuclear Materials Safety Management CY MAR 17-21, 1997 CL AMARILLO, TX SP NATO, US DOE, Off Def Programs, Texas Engn Expt Stn, Minist Russian Federat Atom Energy, Amarillo Natl Resource Ctr Plutonium AB The United States and Russia are dismantling nuclear weapons and generating hundreds of tons of excess plutonium and high enriched uranium fissile nuclear materials that require disposition. The US Department of Energy and the Ministry of the Russian Federation for Atomic Energy (MINATOM) organizations are planning and implementing safe, secure storage and disposition operations for these materials in numerous facilities. This provides a new opportunity for technical exchanges between Russian and Western scientists that can establish an integrated and improved common safety culture for handling these materials. The development and use of personal relationships and joint projects among Russian and Western participants involved in fissile nuclear materials safety management contribute to improving nuclear materials nonproliferation and to making a safer world. Technical exchanges and workshops are being used to systematically identify opportunities in the nuclear fissile materials facilities to improve and ensure the safety of workers, the public, and the environment. C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Jardine, LJ (reprint author), Univ Calif Lawrence Livermore Natl Lab, 7000 E Ave, Livermore, CA 94550 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER PI DORDRECHT PA PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS BN 0-7923-5191-6 J9 NATO SCI S 1 DISARM PY 1998 VL 20 BP 23 EP 28 PG 6 WC Physics, Nuclear SC Physics GA BL79Q UT WOS:000076772400004 ER PT B AU Whiteman, AE Khalil, N Krumpe, PF AF Whiteman, AE Khalil, N Krumpe, PF BE Peddicord, KL Lazarev, LN Jardine, LJ TI Nuclear materials safety management: US perspectives SO NUCLEAR MATERIALS SAFETY MANAGEMENT SE NATO ADVANCED SCIENCE INSTITUTE SERIES, SUB-SERIES 1: DISARMAMENT TECHNOLOGIES LA English DT Proceedings Paper CT NATO Advanced Research Workshop on Nuclear Materials Safety Management CY MAR 17-21, 1997 CL AMARILLO, TX SP NATO, US DOE, Off Def Programs, Texas Engn Expt Stn, Minist Russian Federat Atom Energy, Amarillo Natl Resource Ctr Plutonium AB The US approach to safety management at nuclear facilities consists of an integrated system whereby worker, environmental, and public safety is inherent to the work being performed. This approach is being applied to all Department of Energy (DOE) facilities and programs. A defense-in-depth philosophy identifies hazards and controls them at the level of the source material itself, the primary containment of the material, and, finally, the facility holding the material. Although hazards control has always been a part of the operations around nuclear materials and facilities, recent steps towards integration have improved overall safety as well as efficiency and security. C1 US DOE, Albuquerque Operat Off, Albuquerque, NM 87185 USA. RP Whiteman, AE (reprint author), US DOE, Albuquerque Operat Off, POB 5400, Albuquerque, NM 87185 USA. NR 0 TC 0 Z9 0 U1 1 U2 1 PU SPRINGER PI DORDRECHT PA PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS BN 0-7923-5191-6 J9 NATO SCI S 1 DISARM PY 1998 VL 20 BP 29 EP 31 PG 3 WC Physics, Nuclear SC Physics GA BL79Q UT WOS:000076772400005 ER PT B AU Seitz, MG AF Seitz, MG BE Peddicord, KL Lazarev, LN Jardine, LJ TI Stabilizing plutonium to reduce risk to the public and workers SO NUCLEAR MATERIALS SAFETY MANAGEMENT SE NATO ADVANCED SCIENCE INSTITUTE SERIES, SUB-SERIES 1: DISARMAMENT TECHNOLOGIES LA English DT Proceedings Paper CT NATO Advanced Research Workshop on Nuclear Materials Safety Management CY MAR 17-21, 1997 CL AMARILLO, TX SP NATO, US DOE, Off Def Programs, Texas Engn Expt Stn, Minist Russian Federat Atom Energy, Amarillo Natl Resource Ctr Plutonium C1 US DOE, Off Nucl Mat & Facil Stabilizat, Off Environm Management, Germantown, MD 20874 USA. RP Seitz, MG (reprint author), US DOE, Off Nucl Mat & Facil Stabilizat, Off Environm Management, 19901 Germantown Rd, Germantown, MD 20874 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER PI DORDRECHT PA PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS BN 0-7923-5191-6 J9 NATO SCI S 1 DISARM PY 1998 VL 20 BP 65 EP 68 PG 4 WC Physics, Nuclear SC Physics GA BL79Q UT WOS:000076772400008 ER PT B AU Wood, WT AF Wood, WT BE Peddicord, KL Lazarev, LN Jardine, LJ TI Long-term storage of plutonium SO NUCLEAR MATERIALS SAFETY MANAGEMENT SE NATO ADVANCED SCIENCE INSTITUTE SERIES, SUB-SERIES 1: DISARMAMENT TECHNOLOGIES LA English DT Proceedings Paper CT NATO Advanced Research Workshop on Nuclear Materials Safety Management CY MAR 17-21, 1997 CL AMARILLO, TX SP NATO, US DOE, Off Def Programs, Texas Engn Expt Stn, Minist Russian Federat Atom Energy, Amarillo Natl Resource Ctr Plutonium C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Wood, WT (reprint author), Univ Calif Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER PI DORDRECHT PA PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS BN 0-7923-5191-6 J9 NATO SCI S 1 DISARM PY 1998 VL 20 BP 69 EP 70 PG 2 WC Physics, Nuclear SC Physics GA BL79Q UT WOS:000076772400009 ER PT B AU Eckert, HJ Cohlmeyer, AS AF Eckert, HJ Cohlmeyer, AS BE Peddicord, KL Lazarev, LN Jardine, LJ TI Management of DOE-owned spent nuclear fuel SO NUCLEAR MATERIALS SAFETY MANAGEMENT SE NATO ADVANCED SCIENCE INSTITUTE SERIES, SUB-SERIES 1: DISARMAMENT TECHNOLOGIES LA English DT Proceedings Paper CT NATO Advanced Research Workshop on Nuclear Materials Safety Management CY MAR 17-21, 1997 CL AMARILLO, TX SP NATO, US DOE, Off Def Programs, Texas Engn Expt Stn, Minist Russian Federat Atom Energy, Amarillo Natl Resource Ctr Plutonium C1 US DOE, Off Spent Fuel Management, Washington, DC 20585 USA. RP Eckert, HJ (reprint author), US DOE, Off Spent Fuel Management, Washington, DC 20585 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER PI DORDRECHT PA PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS BN 0-7923-5191-6 J9 NATO SCI S 1 DISARM PY 1998 VL 20 BP 131 EP 138 PG 8 WC Physics, Nuclear SC Physics GA BL79Q UT WOS:000076772400019 ER PT B AU Hyder, ML AF Hyder, ML BE Peddicord, KL Lazarev, LN Jardine, LJ TI Perspectives on nuclear materials safety management methods at DOE sites SO NUCLEAR MATERIALS SAFETY MANAGEMENT SE NATO ADVANCED SCIENCE INSTITUTE SERIES, SUB-SERIES 1: DISARMAMENT TECHNOLOGIES LA English DT Proceedings Paper CT NATO Advanced Research Workshop on Nuclear Materials Safety Management CY MAR 17-21, 1997 CL AMARILLO, TX SP NATO, US DOE, Off Def Programs, Texas Engn Expt Stn, Minist Russian Federat Atom Energy, Amarillo Natl Resource Ctr Plutonium C1 Savannah River Technol Ctr, Aiken, SC 29808 USA. RP Hyder, ML (reprint author), Savannah River Technol Ctr, POB 616, Aiken, SC 29808 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER PI DORDRECHT PA PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS BN 0-7923-5191-6 J9 NATO SCI S 1 DISARM PY 1998 VL 20 BP 321 EP 325 PG 5 WC Physics, Nuclear SC Physics GA BL79Q UT WOS:000076772400040 ER PT B AU Carlson, DD Young, ML Lazarev, LN Petrov, BF Romanovskiy, VN AF Carlson, DD Young, ML Lazarev, LN Petrov, BF Romanovskiy, VN BE Peddicord, KL Lazarev, LN Jardine, LJ TI Overview of Sandia National Laboratories and Khlopin Radium Institute collaborative radiological accident consequence analysis efforts SO NUCLEAR MATERIALS SAFETY MANAGEMENT SE NATO ADVANCED SCIENCE INSTITUTE SERIES, SUB-SERIES 1: DISARMAMENT TECHNOLOGIES LA English DT Proceedings Paper CT NATO Advanced Research Workshop on Nuclear Materials Safety Management CY MAR 17-21, 1997 CL AMARILLO, TX SP NATO, US DOE, Off Def Programs, Texas Engn Expt Stn, Minist Russian Federat Atom Energy, Amarillo Natl Resource Ctr Plutonium C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Carlson, DD (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU SPRINGER PI DORDRECHT PA PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS BN 0-7923-5191-6 J9 NATO SCI S 1 DISARM PY 1998 VL 20 BP 333 EP 340 PG 8 WC Physics, Nuclear SC Physics GA BL79Q UT WOS:000076772400043 ER PT B AU Witmer, FE Gubanov, V Peddicord, KL Lazarev, L AF Witmer, FE Gubanov, V Peddicord, KL Lazarev, L BE Peddicord, KL Lazarev, LN Jardine, LJ TI Protocol of the NATO Advanced Research Workshop on nuclear materials safety management SO NUCLEAR MATERIALS SAFETY MANAGEMENT SE NATO ADVANCED SCIENCE INSTITUTE SERIES, SUB-SERIES 1: DISARMAMENT TECHNOLOGIES LA English DT Proceedings Paper CT NATO Advanced Research Workshop on Nuclear Materials Safety Management CY MAR 17-21, 1997 CL AMARILLO, TX SP NATO, US DOE, Off Def Programs, Texas Engn Expt Stn, Minist Russian Federat Atom Energy, Amarillo Natl Resource Ctr Plutonium C1 US Dept Energy, Def Programs, Special Projects Grp, Washington, DC 20585 USA. RP Witmer, FE (reprint author), US Dept Energy, Def Programs, Special Projects Grp, Washington, DC 20585 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER PI DORDRECHT PA PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS BN 0-7923-5191-6 J9 NATO SCI S 1 DISARM PY 1998 VL 20 BP 361 EP 363 PG 3 WC Physics, Nuclear SC Physics GA BL79Q UT WOS:000076772400046 ER PT B AU Krumpe, PF Witmer, FE Huddleston, PC Moore, JW Peddicord, KL Ruddy, MK AF Krumpe, PF Witmer, FE Huddleston, PC Moore, JW Peddicord, KL Ruddy, MK BE Peddicord, KL Lazarev, LN Jardine, LJ TI Appendix: Internet sites on nuclear materials safety management, environmental safety and health, arms control and disarmament, performance-based management, and lessons learned SO NUCLEAR MATERIALS SAFETY MANAGEMENT SE NATO ADVANCED SCIENCE INSTITUTE SERIES, SUB-SERIES 1: DISARMAMENT TECHNOLOGIES LA English DT Proceedings Paper CT NATO Advanced Research Workshop on Nuclear Materials Safety Management CY MAR 17-21, 1997 CL AMARILLO, TX SP NATO, US DOE, Off Def Programs, Texas Engn Expt Stn, Minist Russian Federat Atom Energy, Amarillo Natl Resource Ctr Plutonium C1 US Dept Energy, Special Projects Grp, Def Programs, Germantown, MD 20874 USA. RP Krumpe, PF (reprint author), US Dept Energy, Special Projects Grp, Def Programs, 19901 Germantown Rd, Germantown, MD 20874 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER PI DORDRECHT PA PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS BN 0-7923-5191-6 J9 NATO SCI S 1 DISARM PY 1998 VL 20 BP 369 EP 374 PG 6 WC Physics, Nuclear SC Physics GA BL79Q UT WOS:000076772400047 ER PT J AU Bernard, C Blum, T DeTar, C Gottlieb, S Heller, UM Hetrick, J McNeile, C Rummukainen, K Sugar, B Toussaint, D Wingate, M AF Bernard, C Blum, T DeTar, C Gottlieb, S Heller, UM Hetrick, J McNeile, C Rummukainen, K Sugar, B Toussaint, D Wingate, M TI Light hadron spectrum MILC results with the Kogut-Susskind and Wilson actions SO NUCLEAR PHYSICS B LA English DT Article; Proceedings Paper CT International Workshop on Lattice QCD on Parallel Computers CY MAR 10-15, 1997 CL UNIV TSUKUBA, CTR COMPUTAT PHYS, TSUKUBA, JAPAN SP Minist Educ Sci & Culture, Int Conf Program, Japan, Hitachi Ltd HO UNIV TSUKUBA, CTR COMPUTAT PHYS ID CHIRAL PERTURBATION-THEORY; LATTICE QCD; VALENCE APPROXIMATION; GAUGE-THEORIES; FINITE-SIZE; 2 FLAVORS; MASSES; QUARK; SPECTROSCOPY; LOGARITHMS AB We present the current status of our ongoing calculations of the light hadron spectrum with both Kogut-Susskind (KS) and Wilson quarks in the valence or quenched approximation. We discuss KS quarks first and find that the chiral extrapolation is potentially the biggest source of systematic error. For the Wilson case, ive focus on finite volume and source size effects at 6/g(2) = 5.7. We find no evidence to support the claim that there is a finite volume effect between N-s = 16 and 24 of approximately 5%. C1 BROOKHAVEN NATL LAB, DEPT PHYS, UPTON, NY 11973 USA. UNIV UTAH, DEPT PHYS, SALT LAKE CITY, UT 84112 USA. INDIANA UNIV, DEPT PHYS, BLOOMINGTON, IN 47405 USA. FLORIDA STATE UNIV, SUPERCOMP COMPUTAT RES INST, TALLAHASSEE, FL 32306 USA. UNIV BIELEFELD, FAK PHYS, D-33501 BIELEFELD, GERMANY. UNIV CALIF SANTA BARBARA, DEPT PHYS, SANTA BARBARA, CA 93106 USA. UNIV ARIZONA, DEPT PHYS, TUCSON, AZ 85721 USA. UNIV COLORADO, DEPT PHYS, BOULDER, CO 80309 USA. RP WASHINGTON UNIV, DEPT PHYS, ST LOUIS, MO 63130 USA. OI Heller, Urs M./0000-0002-2780-5584; Hetrick, James/0000-0002-0740-2251; Wingate, Matthew/0000-0001-6568-988X; DeTar, Carleton/0000-0002-0216-6771; Rummukainen, Kari/0000-0003-2266-4716 NR 27 TC 13 Z9 13 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 EI 1873-1562 J9 NUCL PHYS B JI Nucl. Phys. B PD JAN PY 1998 SU 60A BP 3 EP 13 DI 10.1016/S0920-5632(97)00461-1 PG 11 WC Physics, Particles & Fields SC Physics GA YK639 UT WOS:A1998YK63900002 ER PT J AU Eichten, E AF Eichten, E TI Resolving exceptional configurations SO NUCLEAR PHYSICS B LA English DT Article; Proceedings Paper CT International Workshop on Lattice QCD on Parallel Computers CY MAR 10-15, 1997 CL UNIV TSUKUBA, CTR COMPUTAT PHYS, TSUKUBA, JAPAN SP Minist Educ Sci & Culture, Int Conf Program, Japan, Hitachi Ltd HO UNIV TSUKUBA, CTR COMPUTAT PHYS ID LATTICE QCD; WILSON FERMIONS; U(1) PROBLEM; SPECTRUM; MASSES; LIMIT AB In lattice QCD with Wilson fermions, exceptional configurations arise in the quenched approximation at small quark mass. The origin of these large previously uncontrolled lattice artifacts is identified. A simple well-defined procedure is found which removes the artifacts while maintaining the correct continuum limit. This modified quench approximation (MQA) allows accurate calculations to be carried out for arbitrarily small quark masses. RP FERMILAB NATL ACCELERATOR LAB, DEPT THEORET PHYS, POB 500, BATAVIA, IL 60510 USA. NR 26 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 EI 1873-1562 J9 NUCL PHYS B JI Nucl. Phys. B PD JAN PY 1998 SU 60A BP 43 EP 54 DI 10.1016/S0920-5632(97)00465-9 PG 12 WC Physics, Particles & Fields SC Physics GA YK639 UT WOS:A1998YK63900006 ER PT J AU Bernard, C Blum, T DeGrand, TA DeTar, C Gottlieb, S Heller, UM Hetrick, J McNeile, C Sugar, B Toussaint, D Wingate, M AF Bernard, C Blum, T DeGrand, TA DeTar, C Gottlieb, S Heller, UM Hetrick, J McNeile, C Sugar, B Toussaint, D Wingate, M TI Hybrid mesons in quenched lattice QCD SO NUCLEAR PHYSICS B LA English DT Article; Proceedings Paper CT International Workshop on Lattice QCD on Parallel Computers CY MAR 10-15, 1997 CL UNIV TSUKUBA, CTR COMPUTAT PHYS, TSUKUBA, JAPAN SP Minist Educ Sci & Culture, Int Conf Program, Japan, Hitachi Ltd HO UNIV TSUKUBA, CTR COMPUTAT PHYS AB We have studied exotic hybrid mesons, made from a quark, an antiquark and gluons. Here we summarize a quenched calculation at 6/g(2) = 5.85 and 6.15. We investigate both the light quark hybrids and the charmonium hybrids. These mesons are found to mix with four-quark states, and this mixing can be used to help in extracting masses from the propagators. C1 BROOKHAVEN NATL LAB, DEPT PHYS, UPTON, NY 11973 USA. UNIV COLORADO, DEPT PHYS, BOULDER, CO 80309 USA. UNIV UTAH, DEPT PHYS, SALT LAKE CITY, UT 84112 USA. INDIANA UNIV, DEPT PHYS, BLOOMINGTON, IN 47405 USA. FLORIDA STATE UNIV, SUPERCOMP COMPUTAT RES INST, TALLAHASSEE, FL 32306 USA. UNIV CALIF SANTA BARBARA, DEPT PHYS, SANTA BARBARA, CA 93106 USA. UNIV ARIZONA, DEPT PHYS, TUCSON, AZ 85721 USA. RP WASHINGTON UNIV, DEPT PHYS, ST LOUIS, MO 63130 USA. OI Hetrick, James/0000-0002-0740-2251; Heller, Urs M./0000-0002-2780-5584; Wingate, Matthew/0000-0001-6568-988X; DeTar, Carleton/0000-0002-0216-6771 NR 12 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 EI 1873-1562 J9 NUCL PHYS B JI Nucl. Phys. B PD JAN PY 1998 SU 60A BP 61 EP 64 PG 4 WC Physics, Particles & Fields SC Physics GA YK639 UT WOS:A1998YK63900008 ER PT J AU Mackenzie, PB AF Mackenzie, PB TI Lattice methods for heavy quarks. SO NUCLEAR PHYSICS B LA English DT Article; Proceedings Paper CT International Workshop on Lattice QCD on Parallel Computers CY MAR 10-15, 1997 CL UNIV TSUKUBA, CTR COMPUTAT PHYS, TSUKUBA, JAPAN SP Minist Educ Sci & Culture, Int Conf Program, Japan, Hitachi Ltd HO UNIV TSUKUBA, CTR COMPUTAT PHYS ID QCD AB I compare and contrast the various methods for heavy quarks on the lattice. I discuss which methods work best for different physical systems and the ease with which calculations may be performed. RP FERMILAB NATL ACCELERATOR LAB, DEPT THEORET PHYS, POB 500, BATAVIA, IL 60510 USA. NR 13 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 EI 1873-1562 J9 NUCL PHYS B JI Nucl. Phys. B PD JAN PY 1998 SU 60A BP 101 EP 105 PG 5 WC Physics, Particles & Fields SC Physics GA YK639 UT WOS:A1998YK63900012 ER PT J AU Bernard, C Blum, T DeGrand, TA DeTar, C Gottlieb, S Heller, UM Hetrick, J McNeil, C Rummukainen, K Soni, A Sugar, B Toussaint, D Wingate, M AF Bernard, C Blum, T DeGrand, TA DeTar, C Gottlieb, S Heller, UM Hetrick, J McNeil, C Rummukainen, K Soni, A Sugar, B Toussaint, D Wingate, M TI Heavy-light decay constants - MILC results with the Wilson action SO NUCLEAR PHYSICS B LA English DT Article; Proceedings Paper CT International Workshop on Lattice QCD on Parallel Computers CY MAR 10-15, 1997 CL UNIV TSUKUBA, CTR COMPUTAT PHYS, TSUKUBA, JAPAN SP Minist Educ Sci & Culture, Int Conf Program, Japan, Hitachi Ltd HO UNIV TSUKUBA, CTR COMPUTAT PHYS ID PERTURBATION-THEORY; LATTICE AB We present the current status of our ongoing calculations of pseudoscalar meson decay constants for mesons that contain one light and one heavy quark (f(B), f(Bs), f(D), f(Ds)). We are currently generating new gauge configurations that include dynamical quarks and calculating the decay constants. In addition, we have several new results for the static approximation. Those results, as well as several refinements to the analysis, are new since Lattice '96. Our current (still preliminary) value for f(B) is 156 +/- 11 +/- 30 +/- 14 MeV, where the first error is from statistical and fitting errors, the second error is an estimate of other systematic errors within the quenched approximation and the third error is an estimate of the quenching error. For the ratio f(Bs)/f(B), We get 1.11 +/- 0.02 +/- 0.03 +/- 0.07. C1 BROOKHAVEN NATL LAB, DEPT PHYS, UPTON, NY 11973 USA. UNIV COLORADO, DEPT PHYS, BOULDER, CO 80309 USA. UNIV UTAH, DEPT PHYS, SALT LAKE CITY, UT 84112 USA. INDIANA UNIV, DEPT PHYS, BLOOMINGTON, IN 47405 USA. FLORIDA STATE UNIV, SUPERCOMP COMPUTAT RES INST, TALLAHASSEE, FL 32306 USA. UNIV BIELEFELD, FAK PHYS, D-33501 BIELEFELD, GERMANY. UNIV CALIF SANTA BARBARA, DEPT PHYS, SANTA BARBARA, CA 93106 USA. UNIV ARIZONA, DEPT PHYS, TUCSON, AZ 85721 USA. RP WASHINGTON UNIV, DEPT PHYS, ST LOUIS, MO 63130 USA. OI Hetrick, James/0000-0002-0740-2251; Rummukainen, Kari/0000-0003-2266-4716; Heller, Urs M./0000-0002-2780-5584; Wingate, Matthew/0000-0001-6568-988X; DeTar, Carleton/0000-0002-0216-6771 NR 11 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 EI 1873-1562 J9 NUCL PHYS B JI Nucl. Phys. B PD JAN PY 1998 SU 60A BP 106 EP 113 DI 10.1016/S0920-5632(97)00472-6 PG 8 WC Physics, Particles & Fields SC Physics GA YK639 UT WOS:A1998YK63900013 ER PT J AU Bernard, C Blum, T DeGrand, TA DeTar, C Gottlieb, S Heller, UM Hetrick, J Karkkainen, L Rummukainen, K Sugar, B Toussaint, D Wingate, M AF Bernard, C Blum, T DeGrand, TA DeTar, C Gottlieb, S Heller, UM Hetrick, J Karkkainen, L Rummukainen, K Sugar, B Toussaint, D Wingate, M TI MILC studies of high temperature QCD - a progress report SO NUCLEAR PHYSICS B LA English DT Article; Proceedings Paper CT International Workshop on Lattice QCD on Parallel Computers CY MAR 10-15, 1997 CL UNIV TSUKUBA, CTR COMPUTAT PHYS, TSUKUBA, JAPAN SP Minist Educ Sci & Culture, Int Conf Program, Japan, Hitachi Ltd HO UNIV TSUKUBA, CTR COMPUTAT PHYS ID PHASE-TRANSITION; WILSON QUARKS; 2 FLAVORS; LATTICE; THERMODYNAMICS; EQUATION AB We summarize recently completed studies of the equation of state for QCD with two flavors of Kogut-Susskind quarks on lattices with six time slices, and of the high temperature crossover for two flavors of Wilson quarks with a Symanzik improved gauge action and the clover quark action. In addition, we give a progress report on extensions of the Kogut-Susskind calculations at N-t = 4 to smaller masses in an effort to clarify the scaling behavior near the transition. C1 BROOKHAVEN NATL LAB, DEPT PHYS, UPTON, NY 11973 USA. UNIV UTAH, DEPT PHYS, SALT LAKE CITY, UT 84112 USA. UNIV COLORADO, DEPT PHYS, BOULDER, CO 80309 USA. INDIANA UNIV, DEPT PHYS, BLOOMINGTON, IN 47405 USA. FLORIDA STATE UNIV, SCRI, TALLAHASSEE, FL 32306 USA. NOKIA RES CTR, FIN-33721 TAMPERE, FINLAND. UNIV BIELEFELD, FAK PHYS, D-33501 BIELEFELD, GERMANY. UNIV CALIF SANTA BARBARA, DEPT PHYS, SANTA BARBARA, CA 93106 USA. UNIV ARIZONA, DEPT PHYS, TUCSON, AZ 85721 USA. RP WASHINGTON UNIV, DEPT PHYS, ST LOUIS, MO 63130 USA. OI Hetrick, James/0000-0002-0740-2251; Heller, Urs M./0000-0002-2780-5584; Wingate, Matthew/0000-0001-6568-988X; DeTar, Carleton/0000-0002-0216-6771; Rummukainen, Kari/0000-0003-2266-4716 NR 39 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 EI 1873-1562 J9 NUCL PHYS B JI Nucl. Phys. B PD JAN PY 1998 SU 60A BP 195 EP 202 DI 10.1016/S0920-5632(97)00481-7 PG 8 WC Physics, Particles & Fields SC Physics GA YK639 UT WOS:A1998YK63900022 ER PT J AU Chen, D Chen, P Christ, N Edwards, R Fleming, G Gara, A Hansen, S Jung, C Kaehler, A Kasow, S Kennedy, A Kilcup, G Luo, YB Malureanu, C Mawhinney, R Parsons, J Sexton, J Sui, CZ Vranas, P AF Chen, D Chen, P Christ, N Edwards, R Fleming, G Gara, A Hansen, S Jung, C Kaehler, A Kasow, S Kennedy, A Kilcup, G Luo, YB Malureanu, C Mawhinney, R Parsons, J Sexton, J Sui, CZ Vranas, P TI The QCDSP project - a status report SO NUCLEAR PHYSICS B LA English DT Article; Proceedings Paper CT International Workshop on Lattice QCD on Parallel Computers CY MAR 10-15, 1997 CL UNIV TSUKUBA, CTR COMPUTAT PHYS, TSUKUBA, JAPAN SP Minist Educ Sci & Culture, Int Conf Program, Japan, Hitachi Ltd HO UNIV TSUKUBA, CTR COMPUTAT PHYS AB We give a brief overview of the massively parallel computer project underway for nearly the past four years, centered at Columbia University. A 6 Gflops and a 50 Chops machine are presently being debugged for installation at OSU and SCRI respectively, while a 0.4 Tflops machine is under construction for Columbia and a 0.6 Tflops machine is planned for the new RIKEN Brookhaven Research Center. C1 FLORIDA STATE UNIV, SUPERCOMP COMPUTAT RES INST, TALLAHASSEE, FL 32306 USA. COLUMBIA UNIV, NEVIS LABS, IRVINGTON, NY USA. FERMILAB NATL ACCELERATOR LAB, BATAVIA, IL 60510 USA. OHIO STATE UNIV, DEPT PHYS, COLUMBUS, OH 43210 USA. TRINITY COLL DUBLIN, DUBLIN, IRELAND. RP COLUMBIA UNIV, NEW YORK, NY 10027 USA. RI Fleming, George/L-6614-2013; OI Fleming, George/0000-0002-4987-7167; Vranas, Pavlos/0000-0002-8497-6283 NR 4 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 EI 1873-1562 J9 NUCL PHYS B JI Nucl. Phys. B PD JAN PY 1998 SU 60A BP 241 EP 245 PG 5 WC Physics, Particles & Fields SC Physics GA YK639 UT WOS:A1998YK63900027 ER PT J AU Bernard, C Blum, T DeGrand, TA DeTar, C Gottlieb, S Heller, UM Hetrick, J McNeile, C Rummukainen, K Sugar, B Toussaint, D Wingate, M AF Bernard, C Blum, T DeGrand, TA DeTar, C Gottlieb, S Heller, UM Hetrick, J McNeile, C Rummukainen, K Sugar, B Toussaint, D Wingate, M TI Towards the QCD spectrum with dynamical quarks SO NUCLEAR PHYSICS B LA English DT Article; Proceedings Paper CT International Workshop on Lattice QCD on Parallel Computers CY MAR 10-15, 1997 CL UNIV TSUKUBA, CTR COMPUTAT PHYS, TSUKUBA, JAPAN SP Minist Educ Sci & Culture, Int Conf Program, Japan, Hitachi Ltd HO UNIV TSUKUBA, CTR COMPUTAT PHYS ID LATTICE QCD; SUSSKIND FERMIONS; FLAVORS AB We begin with a progress report on a simulation of two flavor QCD with Kogut-Susskind quarks using the simplest gauge and quark actions. We then discuss some empirical investigations of the hadron spectrum with Kogut-Susskind quarks with improved gauge and quark actions. While these tests are done in the quenched approximation, we expect that improvement of the quenched spectrum is a good indicator of what can be expected in full QCD calculations. C1 BROOKHAVEN NATL LAB, DEPT PHYS, UPTON, NY 11973 USA. UNIV COLORADO, DEPT PHYS, BOULDER, CO 80309 USA. UNIV UTAH, DEPT PHYS, SALT LAKE CITY, UT 84112 USA. INDIANA UNIV, DEPT PHYS, BLOOMINGTON, IN 47405 USA. FLORIDA STATE UNIV, SCRI, TALLAHASSEE, FL 32306 USA. UNIV BIELEFELD, FAK PHYS, D-33501 BIELEFELD, GERMANY. UNIV CALIF SANTA BARBARA, DEPT PHYS, SANTA BARBARA, CA 93106 USA. UNIV ARIZONA, DEPT PHYS, TUCSON, AZ 85721 USA. RP WASHINGTON UNIV, DEPT PHYS, ST LOUIS, MO 63130 USA. OI Hetrick, James/0000-0002-0740-2251; Heller, Urs M./0000-0002-2780-5584; Wingate, Matthew/0000-0001-6568-988X; DeTar, Carleton/0000-0002-0216-6771; Rummukainen, Kari/0000-0003-2266-4716 NR 21 TC 12 Z9 12 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 EI 1873-1562 J9 NUCL PHYS B JI Nucl. Phys. B PD JAN PY 1998 SU 60A BP 297 EP 305 DI 10.1016/S0920-5632(97)00491-X PG 9 WC Physics, Particles & Fields SC Physics GA YK639 UT WOS:A1998YK63900032 ER PT B AU Friar, JL AF Friar, JL BE Seki, R vanKolck, U Savage, MJ TI Nuclear scales SO NUCLEAR PHYSICS WITH EFFECTIVE FIELD THEORY SE PROCEEDINGS FROM THE INSTITUTE FOR NUCLEAR THEORY LA English DT Proceedings Paper CT Joint Caltech/INT Workshop on Nuclear Physics with Effective Field Theory CY FEB 26-27, 1998 CL CALIFORNIA INST TECHNOL, W K KELLOGG RADIAT LAB, PASADENA, CA SP California Inst Technol, Inst Nucl Theory HO CALIFORNIA INST TECHNOL, W K KELLOGG RADIAT LAB AB Nuclear scales are discussed from the nuclear physics viewpoint. The conventional nuclear potential is characterized as a black box that interpolates nucleon-nucleon (NN) data, while being constrained by the best possible theoretical input. The latter consists of the longer-range parts of the NN force (e.g., OPEP, TPEP, the pi-force), which can be calculated using chiral perturbation theory and gauged using modern phase-shift analyses. The shorter-range parts of the force are effectively parameterized by moments of the interaction that are independent of the details of the force model, in analogy to chiral perturbation theory. Results of GFMC calculations in light nuclei are interpreted in terms of fundamental scales, which are in good agreement with expectations from chiral effective field theories. Problems with spin-orbit-type observables are noted. C1 Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. RP Friar, JL (reprint author), Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. NR 0 TC 2 Z9 2 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA PO BOX 128 FARRER RD, SINGAPORE 9128, SINGAPORE BN 981-02-3596-8 J9 PROC INST NUCL THEOR PY 1998 VL 6 BP 145 EP 161 PG 17 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BM17Y UT WOS:000077915600009 ER PT J AU Barrett, LH AF Barrett, LH TI Status of the civilian radioactive waste management program SO NUCLEAR PLANT JOURNAL LA English DT Article C1 US DOE, Off Civilian Radioavt Waste Management, Washington, DC 20585 USA. RP Barrett, LH (reprint author), US DOE, Off Civilian Radioavt Waste Management, Washington, DC 20585 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU EQES INC PI GLEN ELLYN PA 799 ROOSEVELT RD, BUILDING 6, STE 208, GLEN ELLYN, IL 60137-5925 USA SN 0892-2055 J9 NUCL PLANT J JI Nucl. Plant J. PD JAN-FEB PY 1998 VL 16 IS 1 BP 55 EP + PG 4 WC Energy & Fuels; Nuclear Science & Technology SC Energy & Fuels; Nuclear Science & Technology GA 178KW UT WOS:000079265700038 ER PT J AU Shin, U Miller, WF AF Shin, U Miller, WF TI The time-dependent simplified P-2 equations: Asymptotic analyses and numerical experiments SO NUCLEAR SCIENCE AND ENGINEERING LA English DT Article ID TRANSPORT-THEORY; PLANAR GEOMETRY; PN THEORY; LIMIT AB Using an asymptotic expansion, we found that the modified time-dependent simplified P-2 (SP2) equations are robust, high-order, asymptotic approximations to the time-dependent transport equation in a physical regime in which the conventional time-dependent diffusion equation is the leading-order approximation. Using diffusion limit analysis, we also asymptotically compared three competitive time-dependent equations (the telegrapher's equation, the time-dependent SP2 equations, and the time-dependent simplified even-parity equation). As a result, we found that the time-dependent SP2 equations contain higher-order asymptotic approximations to the time-dependent transport equation than the other competitive equations. The numerical results confirm that, in the vast majority of cases, the time-dependent SP2 solutions are significantly more accurate than the time-dependent diffusion and the telegrapher's solutions. We have also shown that the time-dependent SP2 equations have excellent characteristics such as rotational invariance (which means no ray effect), good diffusion limit behavior guaranteed positivity in diffusive regimes, and significant accuracy, even in deep-penetration problems. Through computer-running-time tests, we have shown that the time-dependent SP2 equations can be solved with significantly less computational effort than the conventionally used, time-dependent S-N, equations (for N > 2) and almost as fast as the time-dependent diffusion equation. From all these results, we conclude that the time-dependent SP2 equations should be considered as an important competitor for an improved approximate transport equation solver Such computationally efficient time-dependent transport models are especially important for problems requiring enhanced computational efficiency, su ch as neutronics/fluid-dynamics coupled problems that arise in the analyses of hypothetical nuclear reactor accidents. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Shin, U (reprint author), Univ Calif Los Alamos Natl Lab, MS H854, Los Alamos, NM 87545 USA. NR 26 TC 3 Z9 4 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 USA SN 0029-5639 J9 NUCL SCI ENG JI Nucl. Sci. Eng. PD JAN PY 1998 VL 128 IS 1 BP 27 EP 46 PG 20 WC Nuclear Science & Technology SC Nuclear Science & Technology GA YN733 UT WOS:000071200500003 ER PT J AU Selkov, E Grechkin, Y Mikhailova, N Selkov, E AF Selkov, E Grechkin, Y Mikhailova, N Selkov, E TI MPW: the Metabolic Pathways Database SO NUCLEIC ACIDS RESEARCH LA English DT Article ID ENZYMES AB The Metabolic Pathways Database (MPW) (www.biobase.com/emphome.html/homepage.html/pags/pathways.html) a derivative of EMP (www.biobase.com/EMP) plays a fundamental role in the technology of metabolic reconstructions from sequenced genomes under the PUMA (www.mcs.anl.gov/home/compbio/PUMA/Production/ReconstructedMetabolism/reconstruction.html), WIT (www.mcs.anl.gov/home/compbio/WIT/wit.html) and WIT2 (beauty.isdn.mcs.anl.gov/WIT2.pub/CGI/user.cgi) systems, In October 1997, it included some 2800 pathway diagrams covering primary and secondary metabolism, membrane transport, signal transduction pathways, intracellular traffic, translation and transcription, In the current public release of MPW (beauty.isdn.mcs.anl.gov/MPW), the encoding is based on the logical structure of the pathways and is represented by the objects commonly used in electronic circuit design, This facilitates drawing and editing the diagrams and makes possible automation of the basic simulation operations such as deriving stoichiometric matrices, rate laws, and, ultimately, dynamic models of metabolic pathways, Individual pathway diagrams, automatically derived from the original ASCII records, are stored as SGML instances supplemented by relational indices, An auxiliary database of compound names and structures, encoded in the SMILES format, is maintained to unambiguously connect the pathways to the chemical structures of their intermediates. C1 Russian Acad Sci, Inst Theoret & Expt Biophys, Pushchino 142292, Russia. Argonne Natl Lab, Div Math & Comp Sci, Argonne, IL 60439 USA. RP Selkov, E (reprint author), 5020 S Lake Shore Dr,Apartment 2009, Chicago, IL 60615 USA. NR 8 TC 88 Z9 88 U1 0 U2 4 PU OXFORD UNIV PRESS PI OXFORD PA GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND SN 0305-1048 J9 NUCLEIC ACIDS RES JI Nucleic Acids Res. PD JAN 1 PY 1998 VL 26 IS 1 BP 43 EP 45 DI 10.1093/nar/26.1.43 PG 3 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA YV004 UT WOS:000071778900008 PM 9407141 ER PT J AU Lyness, JN Rude, U AF Lyness, JN Rude, U TI Cubature of integrands containing derivatives SO NUMERISCHE MATHEMATIK LA English DT Article AB We present a new technique for the numerical integration over R, a square or triangle, of an integrand of the form (del u)B-T(del v). This uses only function values of u, B, and v, avoiding explicit differentiation, but is suitable only when the integrand function is regular over R. The technique is analogous to Romberg integration, since it is based on using a sequence of very simple discretizations J((m))), m = 1,2, 3,..., of the required integral and applying extrapolation in rn to provide closer approximations. A general approach to the problem of constructing discretizations is given. We provide specific cost-effective discretizations satisfying familiar, but somewhat arbitrary guidelines. As in Romberg integration, when each component function in the integrand is a polynomial, this technique leads to an exact result. C1 Argonne Natl Lab, Div Math & Comp Sci, Argonne, IL 60439 USA. Univ Augsburg, Inst Math, D-86135 Augsburg, Germany. RP Lyness, JN (reprint author), Argonne Natl Lab, Div Math & Comp Sci, 9700 S Cass Ave, Argonne, IL 60439 USA. OI Ruede, Ulrich/0000-0001-8796-8599 NR 10 TC 5 Z9 6 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 USA SN 0029-599X J9 NUMER MATH JI Numer. Math. PD JAN PY 1998 VL 78 IS 3 BP 439 EP 461 DI 10.1007/s002110050320 PG 23 WC Mathematics, Applied SC Mathematics GA YU998 UT WOS:000071778200006 ER PT J AU Ball, J Bystricky, J Fontaine, JM Gaillard, G Hess, R Janout, Z Khachaturov, BA Kunne, R Lac, CD Lechanoine-Leluc, C Lehar, F de Lesquen, A Lopiano, D Perrot-Kunne, F Rapin, D van Rossum, L Schmitt, H Spinka, HM AF Ball, J Bystricky, J Fontaine, JM Gaillard, G Hess, R Janout, Z Khachaturov, BA Kunne, R Lac, CD Lechanoine-Leluc, C Lehar, F de Lesquen, A Lopiano, D Perrot-Kunne, F Rapin, D van Rossum, L Schmitt, H Spinka, HM TI Direct reconstruction of np elastic scattering amplitudes between 0.80 and 1.1 GeV SO NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA A-NUCLEI PARTICLES AND FIELDS LA English DT Article ID CORRELATION PARAMETER MEASUREMENTS; DIFFERENTIAL CROSS-SECTION; LESS-THAN 180-DEGREES; ANALYZING POWER; ANGULAR-DEPENDENCE; THETA-STAR; P SCATTERING; CM ANGLES; SPIN; NN AB The direct reconstruction of the neutron-proton elastic-scattering amplitudes was carried out at six energies from 0.80 to 1.1 GeV. At the five highest energies the complete sets of spin-dependent observables used were measured in the nucleon-nucleon experimental program at SATURNE II. At 0.80 GeV, LAMPF data were also used. The invariant amplitudes a,b,c,d, and e were fit to the experimental data using a least-squares method. A search for solutions starting from random initial values was performed to determine different possible sets of amplitudes. The real and imaginary parts at several angles are listed in tables and compared with the predictions of two phase shift analyses. C1 CE Saclay, Lab Natl SATURNE, CNRS, IN2P3, F-91191 Gif Sur Yvette, France. CE Saclay, CEA,DSM, F-91191 Gif Sur Yvette, France. CE Saclay, CEA,DAPNIA,SPP, F-91191 Gif Sur Yvette, France. Univ Geneva, DPNC, CH-1211 Geneva 4, Switzerland. Czech Tech Univ, Fac Nucl Sci & Phys Engn, CZ-11519 Prague 1, Czech Republic. Joint Inst Nucl Res, Lab Nucl Problems, Dubna 141980, Moscow Region, Russia. Argonne Natl Lab, HEP Div, Argonne, IL 60439 USA. Univ Freiburg, Fak Phys, D-79104 Freiburg, Germany. RP Ball, J (reprint author), CE Saclay, Lab Natl SATURNE, CNRS, IN2P3, F-91191 Gif Sur Yvette, France. NR 44 TC 20 Z9 22 U1 0 U2 2 PU EDITRICE COMPOSITORI BOLOGNA PI BOLOGNA PA VIA STALINGRADO 97/2, I-40128 BOLOGNA, ITALY SN 1124-1861 J9 NUOVO CIMENTO A JI Nuovo Cimento Soc. Ital. Fis. A-Nucl. Part. Fields PD JAN PY 1998 VL 111 IS 1 BP 13 EP 33 PG 21 WC Physics, Particles & Fields SC Physics GA ZY159 UT WOS:000074592200002 ER PT J AU Tan, ZQ Wu, Q Ma, WH Huang, CH AF Tan, ZQ Wu, Q Ma, WH Huang, CH TI Study of meson-baryon-baryon coupling vertexes SO NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA A-NUCLEI PARTICLES AND FIELDS LA English DT Article ID QUARK-HADRON MODEL; CLOUDY BAG MODEL; NUCLEON AB On the basis of the Cloudy Bag Model, a model to describe vector meson-baryon-baryon coupling interaction is proposed. Various coupling vertexes needed in this model are constructed. The model has been applied to rho meson-nucleon-delta coupling and works well. The resulting coupling constant f(rho N Delta) and corresponding form factor u(rho)(q) are respectively in good agreement with other phenomenological models and empirical form factors. C1 Chinese Ctr Adv Sci & Technol, World Lab, Beijing 100080, Peoples R China. Guangxi Univ, Dept Phys, Nanning 530004, Peoples R China. Acad Sinica, Inst High Energy Phys, Beijing 100039, Peoples R China. RP Tan, ZQ (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Div Nucl Sci, MS 70A-3307, Berkeley, CA 94620 USA. NR 19 TC 0 Z9 0 U1 0 U2 0 PU EDITRICE COMPOSITORI BOLOGNA PI BOLOGNA PA VIA STALINGRADO 97/2, I-40128 BOLOGNA, ITALY SN 1124-1861 J9 NUOVO CIMENTO A JI Nuovo Cimento Soc. Ital. Fis. A-Nucl. Part. Fields PD JAN PY 1998 VL 111 IS 1 BP 51 EP 58 PG 8 WC Physics, Particles & Fields SC Physics GA ZY159 UT WOS:000074592200004 ER PT S AU Davis, K AF Davis, K BE Demeyer, S Bosch, J TI Introduction to parallel object-oriented scientific computing SO OBJECT-ORIENTED TECHNOLOGY: ECOOP'98 WORKSHOP READER SE LECTURE NOTES IN COMPUTER SCIENCE LA English DT Article; Proceedings Paper CT ECOOP 98 Workshop on Object-Oriented Technology CY JUL 20-24, 1998 CL BRUSSELS, BELGIUM C1 Univ Calif Los Alamos Natl Lab, Comp Informat & Commun Sci Comp Grp CIC19, Los Alamos, NM 87545 USA. RP Davis, K (reprint author), Univ Calif Los Alamos Natl Lab, Comp Informat & Commun Sci Comp Grp CIC19, POB 1663, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 1 U2 1 PU SPRINGER-VERLAG BERLIN PI BERLIN PA HEIDELBERGER PLATZ 3, D-14197 BERLIN, GERMANY SN 0302-9743 BN 3-540-65460-7 J9 LECT NOTES COMPUT SC PY 1998 VL 1543 BP 444 EP 445 PG 2 WC Computer Science, Theory & Methods SC Computer Science GA BN79M UT WOS:000082950200173 ER PT S AU Brown, DL Davis, K Henslaw, WD Quinlan, DJ Brislawn, K AF Brown, DL Davis, K Henslaw, WD Quinlan, DJ Brislawn, K BE Demeyer, S Bosch, J TI OVERTURE: Object-oriented parallel adaptive mesh refinement for serial and parallel environments SO OBJECT-ORIENTED TECHNOLOGY: ECOOP'98 WORKSHOP READER SE LECTURE NOTES IN COMPUTER SCIENCE LA English DT Article; Proceedings Paper CT ECOOP 98 Workshop on Object-Oriented Technology CY JUL 20-24, 1998 CL BRUSSELS, BELGIUM C1 Univ Calif Los Alamos Natl Lab, Comp Informat & Commun Sci Comp Grp CIC19, Los Alamos, NM 87545 USA. RP Brown, DL (reprint author), Univ Calif Los Alamos Natl Lab, Comp Informat & Commun Sci Comp Grp CIC19, POB 1663, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 2 PU SPRINGER-VERLAG BERLIN PI BERLIN PA HEIDELBERGER PLATZ 3, D-14197 BERLIN, GERMANY SN 0302-9743 BN 3-540-65460-7 J9 LECT NOTES COMPUT SC PY 1998 VL 1543 BP 446 EP 447 PG 2 WC Computer Science, Theory & Methods SC Computer Science GA BN79M UT WOS:000082950200174 ER PT S AU Davis, K Quinlan, D AF Davis, K Quinlan, D BE Demeyer, S Bosch, J TI ROSE: An optimizing transformation system for C++ array-class libraries SO OBJECT-ORIENTED TECHNOLOGY: ECOOP'98 WORKSHOP READER SE LECTURE NOTES IN COMPUTER SCIENCE LA English DT Article; Proceedings Paper CT ECOOP 98 Workshop on Object-Oriented Technology CY JUL 20-24, 1998 CL BRUSSELS, BELGIUM C1 Univ Calif Los Alamos Natl Lab, Comp Informat & Commun Sci Comp Grp CIC19, Los Alamos, NM 87545 USA. RP Davis, K (reprint author), Univ Calif Los Alamos Natl Lab, Comp Informat & Commun Sci Comp Grp CIC19, POB 1663, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER-VERLAG BERLIN PI BERLIN PA HEIDELBERGER PLATZ 3, D-14197 BERLIN, GERMANY SN 0302-9743 BN 3-540-65460-7 J9 LECT NOTES COMPUT SC PY 1998 VL 1543 BP 452 EP 453 PG 2 WC Computer Science, Theory & Methods SC Computer Science GA BN79M UT WOS:000082950200177 ER PT S AU Davis, K Quinlan, D AF Davis, K Quinlan, D BE Demeyer, S Bosch, J TI The parallel asynchronous data routing environment PADRE SO OBJECT-ORIENTED TECHNOLOGY: ECOOP'98 WORKSHOP READER SE LECTURE NOTES IN COMPUTER SCIENCE LA English DT Article; Proceedings Paper CT ECOOP 98 Workshop on Object-Oriented Technology CY JUL 20-24, 1998 CL BRUSSELS, BELGIUM C1 Univ Calif Los Alamos Natl Lab, Comp Informat & Commun Sci Comp Grp CIC19, Los Alamos, NM 87545 USA. RP Davis, K (reprint author), Univ Calif Los Alamos Natl Lab, Comp Informat & Commun Sci Comp Grp CIC19, POB 1663, Los Alamos, NM 87545 USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER-VERLAG BERLIN PI BERLIN PA HEIDELBERGER PLATZ 3, D-14197 BERLIN, GERMANY SN 0302-9743 BN 3-540-65460-7 J9 LECT NOTES COMPUT SC PY 1998 VL 1543 BP 454 EP 455 PG 2 WC Computer Science, Theory & Methods SC Computer Science GA BN79M UT WOS:000082950200178 ER PT S AU Marshall, JC Ankeny, LA Clancy, SP Hall, JH Heiken, JH Holian, KS Lee, SR McNamara, GR Painter, JW Zander, ME Cummings, JC Haney, SW Karmesin, SR Humphrey, WF Reynders, JV Williams, TW Graham, RL AF Marshall, JC Ankeny, LA Clancy, SP Hall, JH Heiken, JH Holian, KS Lee, SR McNamara, GR Painter, JW Zander, ME Cummings, JC Haney, SW Karmesin, SR Humphrey, WF Reynders, JV Williams, TW Graham, RL BE Demeyer, S Bosch, J TI Tecolote: An object-oriented framework for physics development SO OBJECT-ORIENTED TECHNOLOGY: ECOOP'98 WORKSHOP READER SE LECTURE NOTES IN COMPUTER SCIENCE LA English DT Article; Proceedings Paper CT ECOOP 98 Workshop on Object-Oriented Technology CY JUL 20-24, 1998 CL BRUSSELS, BELGIUM C1 Univ Calif Los Alamos Natl Lab, Tecolote Team, Los Alamos, NM 87545 USA. Univ Calif Los Alamos Natl Lab, POOMA Team, Los Alamos, NM 87545 USA. Silicon Graph Inc, Mt View, CA 94043 USA. RP Marshall, JC (reprint author), Univ Calif Los Alamos Natl Lab, Tecolote Team, POB 1663, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU SPRINGER-VERLAG BERLIN PI BERLIN PA HEIDELBERGER PLATZ 3, D-14197 BERLIN, GERMANY SN 0302-9743 BN 3-540-65460-7 J9 LECT NOTES COMPUT SC PY 1998 VL 1543 BP 458 EP 459 PG 2 WC Computer Science, Theory & Methods SC Computer Science GA BN79M UT WOS:000082950200180 ER PT B AU De Breuck, C Van Breugel, W Rottgering, H Miley, G AF De Breuck, C Van Breugel, W Rottgering, H Miley, G BE Bremer, MN Jackson, N PerezFournon, I TI Searches for high redshift radio galaxies SO OBSERVATIONAL COSMOLOGY: WITH THE NEW RADIO SURVEYS SE ASTROPHYSICS AND SPACE SCIENCE LIBRARY LA English DT Proceedings Paper CT Workshop on Observational Cosmology with the New Radio Surveys CY JAN 13-15, 1997 CL PUERTO LA CRUZ, SPAIN SP Inst Astrofis Canarias, Univ Laguna, Vicerrectorado Invest, European Union, Natl Radio Astron Observ, Netherlands Fdn Res Astron AB We have started a search for High Redshift Radio Galaxies (HZRGs) in an area covering 7 sr by selecting a sample of Ultra Steep Spectrum (USS) sources with a low flux density cut-off S-1400 > 10 mJy and a steep spectral index cut-off of alpha < -1.3 (S proportional to nu(alpha)) from the WENSS, NVSS and TEXAS surveys. Our first results for 27 sources show that we are almost twice as effective in finding HZRGs than than surveys of relatively bright radio sources with a spectral index cut-off of alpha < -1.0. The redshift distribution is consistent with an extension of the z - alpha relation to alpha < -1.3, but a large fraction of our sample (40%) consists of objects which are too faint to observe with 3-4m class telescopes. Our search is aimed at increasing the number of very high redshift radio galaxies for further detailed studies of the formation and evolution of massive galaxies and their environment. C1 Univ Calif Lawrence Livermore Natl Lab, Inst Geophys & Planetary Phys, Livermore, CA 94550 USA. RP De Breuck, C (reprint author), Univ Calif Lawrence Livermore Natl Lab, Inst Geophys & Planetary Phys, L-413,POB 808, Livermore, CA 94550 USA. NR 0 TC 3 Z9 3 U1 0 U2 0 PU SPRINGER PI DORDRECHT PA PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS BN 0-7923-4885-0 J9 ASTROPHYS SPACE SC L PY 1998 VL 226 BP 185 EP 190 PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA BK73H UT WOS:000073246800032 ER PT J AU Luscher, A Hendrey, GR Nosberger, J AF Luscher, A Hendrey, GR Nosberger, J TI Long-term responsiveness to free air CO2 enrichment of functional types, species and genotypes of plants from fertile permanent grassland SO OECOLOGIA LA English DT Article DE interspecific variability; intraspecific variability; perennial species; elevated CO2; fertile permanent grassland ID ELEVATED CARBON-DIOXIDE; LOLIUM-PERENNE; N-2 FIXATION; GROWTH; TEMPERATURE; RESPONSES; NITROGEN; SWARDS; ENVIRONMENTS; ECOSYSTEM AB To test inter- and intraspecific variability in the responsiveness to elevated CO2, 9-14 different genotypes of each of 12 perennial species from fertile permanent grassland were grown in Lolium perenne swards under ambient (35 Pa) and elevated (60 Pa) atmospheric partial pressure of CO2 (pCO(2)) for 3 years in a free air carbon dioxide enrichment (FACE) experiment. The plant species were grouped according to their functional types: grasses (L. perenne, L. multiflorum, Arrhenatherum elatius, Dactylis glomerata, Festuca pratensis, Holcus lanatus, Trisetum flavescens), non-legume dicots (Rumex obtusifolius, R. acetosa, Ranunculus friesianus), and legumes (Trifolium repens, T. pratense). Yield (above a cutting height of 4.5 cm) was measured three times per year. The results were as follow. (1) There were highly significant differences in the responsiveness to elevated pCO(2) between the three functional types; legumes showed the strongest and grasses the weakest yield increase at elevated pCO(2). (2) There were differences in the temporal development of responsiveness to elevated pCO(2) among the functional types. The responsiveness of the legumes declined from the first to the second year, while the responsiveness of the non-legume dicots increased over the 3 years. During the growing season, the grasses and the non-legume dicots showed the strongest response to elevated pCO(2) during reproductive growth in the spring. (3) There were no significant genotypic differences in responsiveness to elevated pCO(2). Our results suggest that, due to interspecific differences in the responsiveness to elevated pCO(2), the species proportion within fertile temperate grassland may change if the increase in pCO(2) continues. Due to the temporal differences in the responsiveness to elevated pCO(2) among species, complex effects of elevated pCO(2) on competitive interactions in mixed swards must be expected. The existence of genotypic variability in the responsiveness to elevated pCO(2), on which selection could act, was not found under our experimental conditions. C1 Swiss Fed Inst Technol, Inst Plant Sci, CH-8092 Zurich, Switzerland. Brookhaven Natl Lab, Dept Appl Sci, Upton, NY 11973 USA. RP Luscher, A (reprint author), Swiss Fed Inst Technol, Inst Plant Sci, CH-8092 Zurich, Switzerland. NR 40 TC 100 Z9 108 U1 5 U2 28 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 USA SN 0029-8549 J9 OECOLOGIA JI Oecologia PD JAN PY 1998 VL 113 IS 1 BP 37 EP 45 PG 9 WC Ecology SC Environmental Sciences & Ecology GA YL928 UT WOS:000071009200004 PM 28307292 ER PT S AU Park, HS Ables, E Barthelmy, SD Bionta, RM Ott, LL Parker, EL Williams, GG AF Park, HS Ables, E Barthelmy, SD Bionta, RM Ott, LL Parker, EL Williams, GG BE DOdorico, S TI Instrumentation of LOTIS: Livermore Optical Transient Imaging System; A fully automated wide-field-of-view telescope system searching for simultaneous optical counterparts of gamma-ray bursts SO OPTICAL ASTRONOMICAL INSTRUMENTATION, PTS 1 AND 2 SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT SPIE Optical Astronomical Instrumentation Conference CY MAR 26-28, 1998 CL KONA, HI SP SPIE, European So Observ, Amer Astron Soc, Astron Soc Pacific, Canadian Astron Soc DE wide-field-of-view telescope; automatic telescope; gamma-ray bursts AB LOTIS is a rapidly slewing wide-field-of-viewtelescope which was designed and constructed to search for simultaneous gamma-ray burst (GRB) optical counterparts. This experiment requires a rapidly slewing (< 10 sec), wide-field-of-view (> 15 degrees), automatic and dedicated telescope. LOTIS utilizes commercial tele-photo lenses and custom 2048 x 2048 CCD cameras to view a 17.6 x 17.6 degrees field of view. It can point to any part of the sky within 5 sec and is fully automated. It is connected via Internet socket to the GRB coordinate distribution network which analyzes telemetry from the satellite and delivers GRB coordinate information in real-time. LOTIS started routine operation in Oct. 1996. In the idle time between GRB triggers, LOTIS systematically surveys the entire available sky every night for new optical transients. This paper will describe the system design and performance. C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Park, HS (reprint author), Univ Calif Lawrence Livermore Natl Lab, POB 808, Livermore, CA 94550 USA. RI Barthelmy, Scott/D-2943-2012 NR 0 TC 5 Z9 5 U1 0 U2 0 PU SPIE-INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA SN 0277-786X BN 0-8194-2802-7 J9 P SOC PHOTO-OPT INS PY 1998 VL 3355 BP 658 EP 664 DI 10.1117/12.316790 PN 1-2 PG 3 WC Astronomy & Astrophysics; Instruments & Instrumentation; Remote Sensing; Optics SC Astronomy & Astrophysics; Instruments & Instrumentation; Remote Sensing; Optics GA BL41A UT WOS:000075411500068 ER PT S AU Mourant, JR Hielscher, AH Freyer, JP Eick, AA Shen, D Johnson, TM AF Mourant, JR Hielscher, AH Freyer, JP Eick, AA Shen, D Johnson, TM BE Alfano, RR Katzir, A TI Cancer cell diagnostics with wavelength dependent or polarized light scattering SO OPTICAL BIOPSY II, PROCEEDINGS OF SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT Optical Biopsy II Conference CY JAN 25-26, 1998 CL SAN JOSE, CA SP Soc Photo Opt Instrumentat Engineers, Int Biomed Opt Soc AB The aim of this work is to investigate light scattering properties of tumorigenic and nontumorigenic cells. Specifically, both wavelength dependent and polarization dependent light scattering properties of cells from a multi-step carcinogenesis model have been measured. Evidence for differences in the light scattering properties of the cells is presented. C1 Univ Calif Los Alamos Natl Lab, Biosci & Biotechnol Grp, Los Alamos, NM 87545 USA. RP Mourant, JR (reprint author), Univ Calif Los Alamos Natl Lab, Biosci & Biotechnol Grp, POB 1663, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SPIE-INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA SN 0277-786X BN 0-8194-2689-X J9 P SOC PHOTO-OPT INS PY 1998 VL 3250 BP 26 EP 32 DI 10.1117/12.305385 PG 7 WC Engineering, Biomedical; Optics; Radiology, Nuclear Medicine & Medical Imaging SC Engineering; Optics; Radiology, Nuclear Medicine & Medical Imaging GA BL04G UT WOS:000074111100004 ER PT S AU Vo-Dinh, T Stokes, DL AF Vo-Dinh, T Stokes, DL BE Kubota, S Milster, TD Wehrenberg, PJ TI SERODS: A new medium for high-density optical data storage SO OPTICAL DATA STORAGE '98 SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT Conference on Optical Data Storage '98 CY MAY 10-13, 1998 CL ASPEN, CO SP OSA Opt Soc Amer, IEEE/Lasers & Electro-Opt Soc, SPIE Int Soc Opt Engn AB A new optical data storage technology based on the surface-enhanced Raman scattering (SERS) effect has been developed for high-density optical memory and three-dimensional data storage. With the surface-enhanced Raman optical data storage (SERODS) technology, the molecular interactions between the optical layer molecules and the nanostructured metal substrate are modified by the writing laser, changing their SERS properties to encode information as bits. Since the SERS properties are extremely sensitive to molecular nano-environments, very small "spectrochemical holes" approaching the diffraction limit can be produced for the writing process. The SERODS device uses a reading laser to induce the SERS emission of molecules on the disk and a photometric detector tuned to the frequency of the Raman spectrum to retrieve the stored information. The results illustrate that SERODS is capable of three-dimensional data storage and has the potential to achieve higher storage density than currently available optical data storage systems. C1 Oak Ridge Natl Lab, Div Life Sci, Adv Monitoring Dev Grp, Oak Ridge, TN 37831 USA. RP Vo-Dinh, T (reprint author), Oak Ridge Natl Lab, Div Life Sci, Adv Monitoring Dev Grp, Oak Ridge, TN 37831 USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU SPIE-INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA SN 0277-786X BN 0-8194-2851-5 J9 P SOC PHOTO-OPT INS PY 1998 VL 3401 BP 284 EP 290 DI 10.1117/12.327949 PG 7 WC Computer Science, Information Systems; Optics SC Computer Science; Optics GA BL84R UT WOS:000076922000039 ER PT S AU Shagam, RN AF Shagam, RN BE Datla, RV Hanssen, LM TI An AC phase measuring interferometer for measuring dn/dT of fused silica and calcium fluoride at 193 nm SO OPTICAL DIAGNOSTIC METHODS FOR INORGANIC TRANSMISSIVE MATERIALS SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT Conference on Optical Diagnostic Methods for Inorganic Transmissive Materials CY JUL 20-21, 1998 CL SAN DIEGO, CA SP SPIE Int Soc Opt Engn DE grating interferometer; photo-thermal measurements; optical properties; phase shift interferometry; refractometry; 193-nm lithography calcium fluoride; fused silica AB A novel method for the measurement of the change in index of refraction vs. temperature (dn/dT) of fused silica and calcium fluoride at the 193 nm wavelength has been developed in support of thermal modeling efforts for the development of 193 nm-based photolithographic exposure tools. The method, based upon grating lateral shear interferometry, uses a transmissive linear grating to divide a 193 nm laser beam into several beam paths by diffraction which propagate through separate identical material samples. One diffracted order passing through one sample overlaps the undiffracted beam from a second sample and forms interference fringes dependent upon the optical path difference between the two samples. Optical phase delay due to an index change from heating one of the samples causes the interference fringes to change sinusoidally with phase. The interferometer also makes use of AC phase measurement techniques through lateral translation of the grating. Results for several samples of fused silica and calcium fluoride are demonstrated. C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Shagam, RN (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SPIE-INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA SN 0277-786X BN 0-8194-2880-9 J9 P SOC PHOTO-OPT INS PY 1998 VL 3425 BP 172 EP 181 DI 10.1117/12.326662 PG 10 WC Materials Science, Characterization & Testing; Materials Science, Coatings & Films; Optics SC Materials Science; Optics GA BM03R UT WOS:000077457500019 ER PT S AU Jellison, GE Modine, FA Boatner, LA AF Jellison, GE Modine, FA Boatner, LA BE Datla, RV Hanssen, LM TI Measurements of the optical functions of uniaxial crystals using 2-modulator generalized ellipsometry (2-MGE) SO OPTICAL DIAGNOSTIC METHODS FOR INORGANIC TRANSMISSIVE MATERIALS SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT Conference on Optical Diagnostic Methods for Inorganic Transmissive Materials CY JUL 20-21, 1998 CL SAN DIEGO, CA SP SPIE Int Soc Opt Engn DE ellipsometry; uniaxial materials; refractive index; dielectric functions AB A new 2-modulator generalized ellipsometer (2-MGE) is used to determine the optical functions of uniaxial materials. This new instrument measures 8 parameters, compared with two parameters measured by standard spectroscopic ellipsometers. These 8 parameters can be used to determine the 6 independent elements in the reduced Jones matrix describing light reflecting from a surface. For orientations of the optical axes significantly different from normal incidence, these measurements can be used to determine the optical functions of uniaxial materials. The resulting optical functions are the most accurate available for photon energies greater than the band gap (where transmission measurements cannot be performed), and they compare well with minimum deviation techniques which are more accurate for photon energies in the transparent region. Several examples will be given, including rutile (TiO2), ZnO, and BiI3. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Jellison, GE (reprint author), Oak Ridge Natl Lab, MS 6030, Oak Ridge, TN 37831 USA. OI Boatner, Lynn/0000-0002-0235-7594 NR 0 TC 3 Z9 3 U1 0 U2 0 PU SPIE-INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA SN 0277-786X BN 0-8194-2880-9 J9 P SOC PHOTO-OPT INS PY 1998 VL 3425 BP 232 EP 238 PG 7 WC Materials Science, Characterization & Testing; Materials Science, Coatings & Films; Optics SC Materials Science; Optics GA BM03R UT WOS:000077457500026 ER PT J AU Beyette, FR Stanko, PJ Feld, SA Mitkas, PA Wilmsen, CW Geib, KM Choquette, KD AF Beyette, FR Stanko, PJ Feld, SA Mitkas, PA Wilmsen, CW Geib, KM Choquette, KD TI Demonstration and performance of a recirculating sorter based on complementary metal oxide semiconductor logic and vertical cavity surface emitting lasers SO OPTICAL ENGINEERING LA English DT Article DE sorting; digital optical computing; optoelectronic smart pixels; CMOS/VCSEL hybrid devices ID IMPLEMENTATION; DESIGN AB The demonstration of an optoelectronic sorter unit is presented. This sorter is constructed using a recirculating architecture that passes data optically between two smart-pixel arrays. Each array is implemented using a hybrid combination of CMOS logic and vertical cavity surface emitting lasers (VCSELs). Since implementation of this system is intended as a tool for evaluating the technological issues associated with CMOS/VCSEL smart-pixel device, the system implementation is designed to minimize interconnect complexity while focusing on the smart-pixel design and analysis. A power budget analysis indicates that the photoreceivers require a minimum of 130 mu W of optical input power, which leads to a VCSEL power requirement of approximate to 415 mu W. The frequency response of the photoreceivers and logic circuit reveals that the photodetector limits the operation to approximate to 3 MHz, which is an order of magnitude slower than the logic circuits frequency limit. (C) 1998 Society of Photo-Optical Instrumentation Engineers. [S0091-3286(98)03101-8]. C1 Univ Cincinnati, Dept Elect & Comp Engn & Comp Sci, Cincinnati, OH 45221 USA. Colorado State Univ, Dept Elect Engn, Ctr Optoelect Comp Syst, Ft Collins, CO 80523 USA. Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Beyette, FR (reprint author), Univ Cincinnati, Dept Elect & Comp Engn & Comp Sci, Cincinnati, OH 45221 USA. NR 13 TC 20 Z9 20 U1 0 U2 0 PU SPIE - INTERNATIONAL SOCIETY FOR OPTICAL ENGINEERING PI BELLINGHAM PA POB 10, BELLINGHAM, WA 98227-0010 USA SN 0091-3286 J9 OPT ENG JI Opt. Eng. PD JAN PY 1998 VL 37 IS 1 BP 312 EP 319 DI 10.1117/1.601618 PG 8 WC Optics SC Optics GA YV001 UT WOS:000071778500043 ER PT S AU Lockett, SJ Fernandez, C Rodriguez, E Wesselmann, U Bastian, BC Sudar, D Pinkel, D Gray, J AF Lockett, SJ Fernandez, C Rodriguez, E Wesselmann, U Bastian, BC Sudar, D Pinkel, D Gray, J BE Farkas, DL Leif, RC Tromberg, BJ Katzir, A TI Interactive system for registering adjacent tissue sections SO OPTICAL INVESTIGATIONS OF CELLS IN VITRO AND IN VIVO, PROCEEDINGS OF SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT Conference on Optical Investigations of Cells In Vitro and In Vivo CY JAN 25-28, 1998 CL SAN JOSE, CA SP Soc Photo Opt Instrumentat Engineers, Int Biomed Opt Soc DE tissue sections; image registration; image mosaicing AB The molecular and structural analysis of cells within their tissue context helps us understand disease mechanisms, such as carcinogenesis. Standard analysis of cutting specimens into thin (4 mu m) sections, followed by labeling and visual microscopic analysis, has the limitation that tissue properties can only be studied within the section plane, and not perpendicular to the plane. We solved these limitations by building a system for registering images of adjacent sections. In addition, the system enables analysis of many molecular markers in a specific tissue volume, by labeling different sections with different markers, followed by using the system to locate the relevant tissue volume in each section. The system has three stages. First, it automatically images each entire section and two fiducial markers per slide. After this stage, the slides can be removed from the microscope. In stage two, pairs of images of adjacent sections are registered. This is done by interactively marking several points that are common to both images, which are used to calculate the translation and rotation of the images relative to each other. Different registrations can be performed on different parts of the images to account for differential stretching, tearing and folding of sections. In stage three, a slide is placed on the microscope stage and the analyst can bring a specific location into the field of view by referring to it in the previously acquired image. Accuracy is approximate to 10 mu m. C1 Ernest Orlando Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. RP Lockett, SJ (reprint author), Ernest Orlando Lawrence Berkeley Natl Lab, MS 74-157, Berkeley, CA 94720 USA. OI Sudar, Damir/0000-0002-2510-7272 NR 0 TC 0 Z9 0 U1 0 U2 0 PU SPIE-INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA SN 0277-786X BN 0-8194-2699-7 J9 P SOC PHOTO-OPT INS PY 1998 VL 3260 BP 154 EP 161 DI 10.1117/12.307090 PG 8 WC Engineering, Biomedical; Medical Laboratory Technology; Microscopy; Optics SC Engineering; Medical Laboratory Technology; Microscopy; Optics GA BL09H UT WOS:000074240100018 ER PT S AU Steinkamp, JA Parson, JD Keij, JF AF Steinkamp, JA Parson, JD Keij, JF BE Farkas, DL Leif, RC Tromberg, BJ Katzir, A TI Progress towards combined phase and amplitude demodulation fluorescence lifetime measurements by flow cytometry SO OPTICAL INVESTIGATIONS OF CELLS IN VITRO AND IN VIVO, PROCEEDINGS OF SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT Conference on Optical Investigations of Cells In Vitro and In Vivo CY JAN 25-28, 1998 CL SAN JOSE, CA SP Soc Photo Opt Instrumentat Engineers, Int Biomed Opt Soc DE flow cytometry; fluorescence lifetime; frequency domain; phase-sensitive detection; amplitude demodulation AB A phase-sensitive flow cytometer has been developed to quantify fluorescence lifetimes directly as a parameter in real time on particles and cells labeled with fluorophores. This instrument combines flow cytometry and frequency-domain fluorescence lifetime spectroscopy measurement principles to provide unique features for making excited-state lifetime measurements. Cells are analyzed as they intersect a high-frequency, intensity-modulated (sine wave) laser excitation beam. Fluorescence signals are processed by analog phase comparator measurement electronics to provide output signals proportional to the sine and cosine of the phase difference between the modulated signal input and a steady state reference signal. The ratios, which are proportional to the lifetimes, are displayed as frequency distributions histograms. In this study we present the underlying theory to measure fluorescence lifetimes by both phase shift and amplitude demodulation. Prototype analog amplitude demodulation electronics have been constructed and are being tested using simulated signals, fluorescent microspheres, and cells labeled with fluorescent probes. C1 Univ Calif Los Alamos Natl Lab, Div Life Sci, Los Alamos, NM 87545 USA. RP Steinkamp, JA (reprint author), Univ Calif Los Alamos Natl Lab, Div Life Sci, MS M888, Los Alamos, NM 87545 USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU SPIE-INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA SN 0277-786X BN 0-8194-2699-7 J9 P SOC PHOTO-OPT INS PY 1998 VL 3260 BP 236 EP 244 DI 10.1117/12.307098 PG 9 WC Engineering, Biomedical; Medical Laboratory Technology; Microscopy; Optics SC Engineering; Medical Laboratory Technology; Microscopy; Optics GA BL09H UT WOS:000074240100028 ER PT J AU Saxena, A Yu, ZG Smith, DL Bishop, AR AF Saxena, A Yu, ZG Smith, DL Bishop, AR TI Electronic transmission across a metal/conjugated-oligomer/metal structure: role of intrinsic disorder SO OPTICAL MATERIALS LA English DT Article; Proceedings Paper CT Symposium M on Materials, Physics and Devices for Molecular Electronics and Photonics of the 1997 Annual Meeting of the European Materials Research Society CY JUN 16-19, 1997 CL STRASBOURG, FRANCE SP European Mat Res Soc ID CONDUCTION; MOTION AB We have studied electronic transmission across metal/conjugated-oligomer/metal structures: (a) one oligomer chain, and (b) two oligomer chains sandwiched between metal contacts, in the presence of lattice fluctuations. The lattice fluctuations are approximated by static white noise disorder. Resonant transmission occurs when the energy of an incoming electron coincides with a discrete electronic level of the oligomer. Because of disorder there is an enhancement of electronic transmission for energies that lie within the electronic gap of the oligomer. If fluctuations are sufficiently strong, a transmission peak within the gap is found at the midgap energy E=0 for degenerate conjugated oligomers. For the two-chain case the spatial mirror symmetry is broken and coherence between the wavefunctions of two chains is partly lost when fluctuations are introduced. (C) 1998 Elsevier Science B.V. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Saxena, A (reprint author), Univ Calif Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. EM avadh@lanl.gov NR 16 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0925-3467 J9 OPT MATER JI Opt. Mater. PD JAN PY 1998 VL 9 IS 1-4 BP 461 EP 464 DI 10.1016/S0925-3467(97)00071-2 PG 4 WC Materials Science, Multidisciplinary; Optics SC Materials Science; Optics GA ZD965 UT WOS:000072743500084 ER PT J AU Brazovskii, S Kirova, N Bishop, AR AF Brazovskii, S Kirova, N Bishop, AR TI Theory of electronic states and excitations in PPV SO OPTICAL MATERIALS LA English DT Article; Proceedings Paper CT Symposium M on Materials, Physics and Devices for Molecular Electronics and Photonics of the 1997 Annual Meeting of the European Materials Research Society CY JUN 16-19, 1997 CL STRASBOURG, FRANCE SP European Mat Res Soc ID INTERBAND EXCITATIONS; EXCITONS; POLYPHENYLENES AB We present a consistent theoritical picture for optical properties of phenyl based polymers, especially for the PPV family. The model is based upon an analytical solution for the band structure of PPV oligomers, while invoking the dominant Coulomb corrections for electron-hole interactions. The adjustable parameters are only the common shift for the bands centers of gravity and a dielectric susceptibility at small distances. Our picture gives a clear understanding for the origin of all possible transitions in linear and nonlinear optics. We describe both tightly bound localized excitons and excitons of intermediate range (i.e. of both the Frenkel and Wannier-Mott types). The quantitative description of excitons is obtained from the long range Coulomb interactions. We emphasize where the ring torsion plays a role in the overall energy minimization of the excited state. This article provides theory details for the joint article [S. Brazovskii, N. Kirova, A.R. Bishop, V. Klimov, D. McBranch, N. N. Barashkov, J.P. Ferraris, Opt. Mater. 9 (1998) 472], where a complete picture was outlined. (C) 1998 Elsevier Science B.V. C1 Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. Univ Calif Los Alamos Natl Lab, Ctr Nonlinear Studies, Los Alamos, NM 87545 USA. Univ Paris Sud, CNRS, Phys Solides Lab, F-91405 Orsay, France. RP Brazovskii, S (reprint author), Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. RI Brazovskii, Serguei/A-9608-2012 OI Brazovskii, Serguei/0000-0001-8147-9655 NR 13 TC 14 Z9 14 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0925-3467 J9 OPT MATER JI Opt. Mater. PD JAN PY 1998 VL 9 IS 1-4 BP 465 EP 471 DI 10.1016/S0925-3467(97)00120-1 PG 7 WC Materials Science, Multidisciplinary; Optics SC Materials Science; Optics GA ZD965 UT WOS:000072743500085 ER PT J AU Brazovskii, S Kirova, N Bishop, AR Klimov, V McBranch, D Barashkov, NN Ferraris, JP AF Brazovskii, S Kirova, N Bishop, AR Klimov, V McBranch, D Barashkov, NN Ferraris, JP TI Excitations and optical properties of phenylene-based conjugated polymers and oligomers SO OPTICAL MATERIALS LA English DT Article; Proceedings Paper CT Symposium M on Materials, Physics and Devices for Molecular Electronics and Photonics of the 1997 Annual Meeting of the European Materials Research Society CY JUN 16-19, 1997 CL STRASBOURG, FRANCE SP European Mat Res Soc ID PHOTOINDUCED ABSORPTION; INTERBAND EXCITATIONS; EXCITONS; POLYPHENYLENES; VINYLENE); SPECTRA AB We present a combined experimental and theoretical study of the ground and photoexcited optical properties of a model oligomer of PPV, MEH-DSB. Our theoretical picture is based upon a band description of electronic states of PPV oligomers, while invoking corrections from Coulomb interactions. The necessary discrete energy levels at low and intermediate energies appear naturally, in addition to the lower energy delocalized states. On this basis we identify the most important features in direct optical absorption for both high (4-6 eV) and low (2-4 eV) photon energies as well as in photoinduced absorption (PA) and stimulated photoemissions (SE) in MEH-DSB solutions, which represent the limit of noninteracting oligomers. While in agreement with previous interpretations for three absorption peaks (2.74, 4.46 and 6.2 eV), we give anew assignment for the most disputed 3.62 eV one as well as for the two PA peaks. (C) 1998 Elsevier Science B.V. C1 Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. Univ Calif Los Alamos Natl Lab, Ctr Nonlinear Studies, Los Alamos, NM 87545 USA. Univ Calif Los Alamos Natl Lab, Chem Sci & Technol Div, Los Alamos, NM 87545 USA. LD Landau Theoret Phys Inst, Moscow, Russia. Univ Texas, Dallas, TX 75230 USA. Univ Paris Sud, CNRS, Phys Solides Lab, F-91405 Orsay, France. RP Brazovskii, S (reprint author), Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. RI Brazovskii, Serguei/A-9608-2012 OI Brazovskii, Serguei/0000-0001-8147-9655 NR 24 TC 38 Z9 38 U1 0 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0925-3467 J9 OPT MATER JI Opt. Mater. PD JAN PY 1998 VL 9 IS 1-4 BP 472 EP 479 DI 10.1016/S0925-3467(97)00074-8 PG 8 WC Materials Science, Multidisciplinary; Optics SC Materials Science; Optics GA ZD965 UT WOS:000072743500086 ER PT J AU List, EJW Graupner, W Wohlgenannt, M Leising, G Partee, J Shinar, J Schlichting, P Rohr, U Geerts, Y Scherf, U Mullen, K AF List, EJW Graupner, W Wohlgenannt, M Leising, G Partee, J Shinar, J Schlichting, P Rohr, U Geerts, Y Scherf, U Mullen, K TI Dynamics of photoexcitations in highly fluorescent organic guest-host-systems SO OPTICAL MATERIALS LA English DT Article; Proceedings Paper CT Symposium M on Materials, Physics and Devices for Molecular Electronics and Photonics of the 1997 Annual Meeting of the European Materials Research Society CY JUN 16-19, 1997 CL STRASBOURG, FRANCE SP European Mat Res Soc ID POLARONS; POLYMERS; EXCITONS AB A guest-host-system based an a few hundred ppm of the red emitting poly(perylene-co-diethynylbenzene) (PPDB) in blue emitting ladder-type poly(para-phenylene) (LPPP) can be used to build efficient white light emitting devices. Upon photoexcitation of the films a very efficient excitation energy transfer (EET), involving the diffusion of an electron hole pair from the higher energy yap LPPP to the lower-gap PPDB, is observed. The results of optically detected magnetic resonance and photoinduced absorption of these blends, all of which are sensitive to charged spin 1/2 stairs and spin 1 triplet excitons. are described and discussed. (C) 1998 Elsevier Science B.V. C1 Graz Tech Univ, Inst Festkorperphys, A-8010 Graz, Austria. Iowa State Univ, Ames Lab, Ames, IA 50011 USA. Max Planck Inst Polymerforsch, Mainz, Germany. RP List, EJW (reprint author), Graz Tech Univ, Inst Festkorperphys, Petersgasse 16, A-8010 Graz, Austria. EM spaky@sbox.tu-graz.ac.at RI Scherf, Ullrich/G-1552-2012; List-Kratochvil, Emil/M-5312-2013 NR 16 TC 5 Z9 6 U1 0 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0925-3467 J9 OPT MATER JI Opt. Mater. PD JAN PY 1998 VL 9 IS 1-4 BP 494 EP 497 DI 10.1016/S0925-3467(97)00136-5 PG 4 WC Materials Science, Multidisciplinary; Optics SC Materials Science; Optics GA ZD965 UT WOS:000072743500090 ER PT J AU Brazovskii, S Kirova, N Yu, ZG Bishop, AR Saxena, A AF Brazovskii, S Kirova, N Yu, ZG Bishop, AR Saxena, A TI Stability of bipolarons in conjugated polymers SO OPTICAL MATERIALS LA English DT Article; Proceedings Paper CT Symposium M on Materials, Physics and Devices for Molecular Electronics and Photonics of the 1997 Annual Meeting of the European Materials Research Society CY JUN 16-19, 1997 CL STRASBOURG, FRANCE SP European Mat Res Soc ID LIGHT-EMITTING-DIODES; CONDUCTING POLYMERS AB The bipolarons appear to be the main entity for charge collection in conducting polymers. But their existence is challenged by the Coulomb repulsion. We study the stability of a bipolaron (BP) as a unction of the strength of the long range Coulomb interaction U with and without impurities for both weak and strong electron-phonon coupling (alpha). We find that in a free state the BP is stable only for small values of U for the weak coupling limit but stays stable until relatively large ti in the strong coupling case. Being bound to a dopant, the bipolaron becomes stable in a wide range of U. Free BPs near the metal-polymer contact also are stabilized due to a screening by image charges. These results are important for charge injection at polymer-metal interfaces in the context of organic light-emitting diodes. (C) 1998 Elsevier Science B.V. C1 Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. Univ Paris Sud, CNRS, Phys Solides Lab, F-91405 Orsay, France. RP Brazovskii, S (reprint author), Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. RI Yu, Z/B-5547-2009; Brazovskii, Serguei/A-9608-2012 OI Brazovskii, Serguei/0000-0001-8147-9655 NR 8 TC 15 Z9 15 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0925-3467 J9 OPT MATER JI Opt. Mater. PD JAN PY 1998 VL 9 IS 1-4 BP 502 EP 506 DI 10.1016/S0925-3467(97)00121-3 PG 5 WC Materials Science, Multidisciplinary; Optics SC Materials Science; Optics GA ZD965 UT WOS:000072743500092 ER PT S AU Thomas, N Siekhaus, W Farmer, J Gregg, H Erlandson, A Marshall, C Wolfe, J Fix, D Ahre, D AF Thomas, N Siekhaus, W Farmer, J Gregg, H Erlandson, A Marshall, C Wolfe, J Fix, D Ahre, D BE Chen, PT McClintock, WE Rottman, GJ TI Prevention of corrosion of silver reflectors for the National Ignition Facility SO OPTICAL SYSTEMS CONTAMINATION AND DEGRADATION SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT Conference on Optical Systems Contamination and Degradation CY JUL 20-23, 1998 CL SAN DIEGO, CA SP SPIE Int Soc Opt Engn AB A durable protected silver coating(1,2) was designed and fabricated for possible use on flashlamp reflectors in the National Ignition Facility (NIF) to avoid tarnishing under corrosive conditions and intense visible light (10 J/cm(2), 360 mu s). This coating provides a valuable alternative for mirror coatings where high reflectance and durability are important requirements. This paper describes a protected silver coating having high reflectance from 400 nm to 10,000 Mt The specular reflectance is between 95% and 98% in the visible region and 98% or better in the infrared region. C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Thomas, N (reprint author), Univ Calif Lawrence Livermore Natl Lab, 7000 E Ave, Livermore, CA 94550 USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU SPIE-INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA SN 0277-786X BN 0-8194-2882-5 J9 P SOC PHOTO-OPT INS PY 1998 VL 3427 BP 394 EP 400 DI 10.1117/12.328510 PG 7 WC Engineering, Aerospace; Optics SC Engineering; Optics GA BM07P UT WOS:000077549100036 ER PT S AU Takacs, PZ Furenlid, K Furenlid, L AF Takacs, PZ Furenlid, K Furenlid, L BE Chen, PT McClintock, WE Rottman, GJ TI Damage observations on synchrotron beam line mirrors SO OPTICAL SYSTEMS CONTAMINATION AND DEGRADATION SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT Conference on Optical Systems Contamination and Degradation CY JUL 20-23, 1998 CL SAN DIEGO, CA SP SPIE Int Soc Opt Engn DE radiation damage; x-ray damage; synchrotron mirrors; synchrotron beam lines; ZERODUR; glass damage; x-rays; x-ray optics AB Catastrophic damage has been observed in ZERODUR mirrors used as first mirrors in two beam lines at the National Synchrotron Light Source (NSLS). ZERODUR was selected as a substrate for these uncooled, grazing incidence mirrors because of its superior thermal expansion properties near room temperature. Despite the high reflectivity of the coatings used on these mirrors, a significant flux of high energy photons penetrates below the coating and is absorbed mainly in a thin layer at the top of the substrate. Over a long time period the absorbed flux causes the glass material to compact, leading to a build-up of surface stress, gross figure changes, and the growth of fractures. The total dose of absorbed radiation for these mirrors is estimated to be in the range of 10(6) MRads, i.e. 10(12) Rads, which is orders of magnitude greater than the dose used in conventional radiation damage studies for space-borne optics and deep UV lithography systems. C1 Brookhaven Natl Lab, Instrumentat Div, Upton, NY 11973 USA. RP Takacs, PZ (reprint author), Brookhaven Natl Lab, Instrumentat Div, 535B, Upton, NY 11973 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SPIE-INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA SN 0277-786X BN 0-8194-2882-5 J9 P SOC PHOTO-OPT INS PY 1998 VL 3427 BP 401 EP 410 DI 10.1117/12.328511 PG 10 WC Engineering, Aerospace; Optics SC Engineering; Optics GA BM07P UT WOS:000077549100037 ER PT J AU James, DFV Wolf, E AF James, DFV Wolf, E TI Determination of the degree of coherence of light from spectroscopic measurements SO OPTICS COMMUNICATIONS LA English DT Article AB A method is proposed for determination of the amplitude and the phase of the spectral degree of coherence from spectroscopic measurements. The technique is illustrated by a numerical example. (C) 1998 Elsevier Science B.V. C1 Univ Calif Los Alamos Natl Lab, Theoret Div T4, Los Alamos, NM 87545 USA. Univ Rochester, Rochester Theory Ctr Opt Sci & Engn, Rochester, NY 14627 USA. Univ Rochester, Dept Phys & Astron, Rochester, NY 14627 USA. Univ Rochester, Inst Opt, Rochester, NY 14627 USA. RP James, DFV (reprint author), Univ Calif Los Alamos Natl Lab, Theoret Div T4, Mail Stop B-268, Los Alamos, NM 87545 USA. RI James, Daniel/B-9805-2009 OI James, Daniel/0000-0003-3981-4602 NR 4 TC 24 Z9 24 U1 0 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0030-4018 J9 OPT COMMUN JI Opt. Commun. PD JAN 1 PY 1998 VL 145 IS 1-6 BP 1 EP 4 DI 10.1016/S0030-4018(97)00369-6 PG 4 WC Optics SC Optics GA YP271 UT WOS:000071260200001 ER PT J AU Descour, MR Simon, DI Sweatt, WC Warren, ME Kravitz, SH Krenz, KD Ray-Chaudhuri, AK Stulen, RH AF Descour, MR Simon, DI Sweatt, WC Warren, ME Kravitz, SH Krenz, KD Ray-Chaudhuri, AK Stulen, RH TI Microtags with 150-nm line gratings fabricated by use of extreme-ultraviolet lithography SO OPTICS LETTERS LA English DT Article AB The microtag concept is an anticounterfeiting and security measure. Microtags are computer-generated holograms (CGH's) consisting of 150-nm lines arranged to form 300-nm-period gratings. The microtags that we describe were designed for readout at 442 nm. The smallest microtag measures 56 mu m x 80 mu m when viewed at normal incidence. The CGH design process uses a modified iterative Fourier-transform algorithm to create either phase-only or phase-and-amplitude microtags. We also report on a simple and compact readout system for recording the diffraction pattern formed by a microtag. The measured diffraction patterns agree very well with predictions. (C) 1998 Optical Society of America. C1 Univ Arizona, Ctr Opt Sci, Tucson, AZ 85721 USA. Sandia Natl Labs, Albuquerque, NM 87185 USA. Sandia Natl Labs, Livermore, CA 94550 USA. RP Descour, MR (reprint author), Univ Arizona, Ctr Opt Sci, Tucson, AZ 85721 USA. NR 7 TC 0 Z9 0 U1 0 U2 0 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD JAN 1 PY 1998 VL 23 IS 1 BP 13 EP 15 DI 10.1364/OL.23.000013 PG 3 WC Optics SC Optics GA YP380 UT WOS:000071271100005 PM 18084396 ER PT J AU Potra, FA Sheng, RQ AF Potra, FA Sheng, RQ TI On homogeneous interior-point algorithms for semidefinite programming SO OPTIMIZATION METHODS & SOFTWARE LA English DT Article DE semidefinite programming; homogeneous interior-point algorithm; polynomial complexity AB A simple homogeneous primal-dual feasibility model is proposed for semidefinite programming (SDP) problems. Two infeasible-interior-point algorithms an applied to the homogeneous formulation. The algorithms do not need a big M initialization. If the original SDP problem has a solution (X*, y*, S*), then both algorithms find an epsilon-approximate solution (i.e., a solution with residual error less than or equal to epsilon) in at most O(root nIn(rho(+)epsilon(0)/epsilon)) steps, where rho* = Tr(X* + S*) and epsilon(0) is the residual error at the (normalized) starting point. A simple way of monitoring possible infeasibility of the original SDP problem is provided such that in at most O(root nIn(rho epsilon(0)/epsilon)) steps either an epsilon-approximate solution is obtained, or it is determined that there is no solution (X*, y*, S*) with Tr(X* + S*) less than or equal to a given number rho > 0. Numerical results on Mehrotra type primal-dual predictor-corrector algorithms show that the homogeneous algorithms outperform their non-homogeneous counterparts, with improvement of more than 20% in many cases, in terms of total CPU time. C1 Univ Iowa, Dept Math, Iowa City, IA 52242 USA. Argonne Natl Lab, Div Math & Comp Sci, Argonne, IL 60439 USA. NR 25 TC 20 Z9 20 U1 0 U2 0 PU GORDON BREACH SCI PUBL LTD PI READING PA C/O STBS LTD, PO BOX 90, READING RG1 8JL, BERKS, ENGLAND SN 1055-6788 J9 OPTIM METHOD SOFTW JI Optim. Method Softw. PY 1998 VL 9 IS 1-3 BP 161 EP 184 DI 10.1080/10556789808805691 PG 24 WC Computer Science, Software Engineering; Operations Research & Management Science; Mathematics, Applied SC Computer Science; Operations Research & Management Science; Mathematics GA ZH574 UT WOS:000073125100010 ER PT S AU Han, J Crawford, MH AF Han, J Crawford, MH BE Osinski, M Su, YK TI MOCVD growth of AlGaN UV LEDs SO OPTOELECTRONIC MATERIALS AND DEVICES SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT SPIE Conference on Optoelectronic Materials and Devices CY JUL 09-11, 1998 CL TAIPEI, TAIWAN SP SPIE, Taiwan Chapter, Photon Ind Dev Assoc, Natl Sci Council, Taiwan DE GaN; AlGaN; ultraviolet emitter; gas-phase reaction AB Issues related to the MOCVD growth of AlGaN, specifically the gas-phase parasitic reactions among TMG, TMA, and NH3, are studied using an in-situ optical reflectometer. It is observed that the presence of the well-known gas phase adduct (TMA: NH3) could seriously hinder the incorporation behavior of TMGa. Relatively low reactor pressures (30-50 Torr) are employed to grow an AlGaN/GaN SCH QW p-n diode structure. The UV emission at 360 nm (FWHM similar to 10 nm) represents the first report of LED operation from an indium-free GaN QW diode. C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Han, J (reprint author), Sandia Natl Labs, MS 0601, Albuquerque, NM 87185 USA. NR 0 TC 4 Z9 4 U1 0 U2 4 PU SPIE-INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA SN 0277-786X BN 0-8194-2873-6 J9 P SOC PHOTO-OPT INS PY 1998 VL 3419 BP 46 EP 50 DI 10.1117/12.311042 PG 5 WC Optics SC Optics GA BL85U UT WOS:000076961400007 ER PT S AU Jones, ED Kotera, N Reno, JL Wang, JJ AF Jones, ED Kotera, N Reno, JL Wang, JJ BE Osinski, M Su, YK TI Conduction band mass determinations for N-type InGaAs/InAlAs single quantum wells SO OPTOELECTRONIC MATERIALS AND DEVICES SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT SPIE Conference on Optoelectronic Materials and Devices CY JUL 09-11, 1998 CL TAIPEI, TAIWAN SP SPIE, Taiwan Chapter, Photon Ind Dev Assoc, Natl Sci Council, Taiwan DE conduction-band mass; cyclotron resonance; magnetoluminescence; quantum well AB We report the measurement of the conduction band mass in n-type single 27-ML-wide InGaAs/InAlAs quantum well lattice matched to InP using two methods: (1) Magnetoluminescence spectroscopy and (2) far-infrared cyclotron resonance. The magnetoluminescence method utilizes Landau level transitions between 0 and 14 T at 1.4 K, The far infrared cyclotron resonance measurements were made at 4.2 K and to fields as large up to 18 T. The 2D-carrier density N-2D = 3 x 10(11) cm(-2) at low temperatures. The magnetoluminescence technique yielded an effective conduction-band mass of m(c) = 0.062m(0) while the far-infrared cyclotron resonance measurements gave m(c) = 0.056m(0). Both measurements show no evidence for any significant conduction-band nonparabolicity. C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Jones, ED (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU SPIE-INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA SN 0277-786X BN 0-8194-2873-6 J9 P SOC PHOTO-OPT INS PY 1998 VL 3419 BP 146 EP 150 DI 10.1117/12.311003 PG 5 WC Optics SC Optics GA BL85U UT WOS:000076961400020 ER PT S AU Lin, SY Wendt, JR Vawter, GA Fleming, JG Hetherington, DL Smith, BK Zubrzycki, W Chow, KC Kurtz, SR Hammons, BE Villeneuve, PR Joannopoulos, JD Biswas, R Ho, KM Sigalas, MM AF Lin, SY Wendt, JR Vawter, GA Fleming, JG Hetherington, DL Smith, BK Zubrzycki, W Chow, KC Kurtz, SR Hammons, BE Villeneuve, PR Joannopoulos, JD Biswas, R Ho, KM Sigalas, MM BE Osinski, M Su, YK TI Applications of photonic crystals in optoelectronics SO OPTOELECTRONIC MATERIALS AND DEVICES SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT SPIE Conference on Optoelectronic Materials and Devices CY JUL 09-11, 1998 CL TAIPEI, TAIWAN SP SPIE, Taiwan Chapter, Photon Ind Dev Assoc, Natl Sci Council, Taiwan DE photonic band gap structure; photonic crystal; prism; laser AB In this paper I describe realistic applications of photonic band gap (PBG) materials in optoelectronics at the mm-wave, infrared and optical wavelength regimes. Examples are highly dispersive PBG-prisms and PBG-lasers. I will also describe our recent breakthrough at Sandia in the successful fabrication of three-dimensional (3D) silicon photonic crystal operating: at infrared wavelengths. C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Lin, SY (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. NR 0 TC 1 Z9 1 U1 0 U2 1 PU SPIE-INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA SN 0277-786X BN 0-8194-2873-6 J9 P SOC PHOTO-OPT INS PY 1998 VL 3419 BP 268 EP 272 DI 10.1117/12.311017 PG 5 WC Optics SC Optics GA BL85U UT WOS:000076961400033 ER PT J AU Clifford, DJ Clayton, JL Damste, JSS AF Clifford, DJ Clayton, JL Damste, JSS TI 2,3,6-/3,4,5-trimethyl substituted diaryl carotenoid derivatives (Chlorobiaceae) in petroleums of the Belarussian Pripyat River Basin SO ORGANIC GEOCHEMISTRY LA English DT Article; Proceedings Paper CT 18th International Meeting on Organic Geochemistry CY SEP 22-26, 1997 CL MAASTRICHT, NETHERLANDS SP European Assoc Organ Geochemists DE Chlorobiaceae; diaromatic carotenoids; euxinia; carbon isotopes; isorenieratene; photosynthetic; sulfur bacteria; catagenesis; crude oil ID PHOTIC ZONE ANOXIA; MOLECULAR INDICATORS; SEDIMENT DIAGENESIS; BIOLOGICAL MARKERS; ARYL ISOPRENOIDS; BETA-CAROTENE; BLACK-SEA; SHALE; AROMATIZATION; CYCLIZATION AB Degradation products of the 2,3,6-/3,4,5-trimethyl substituted analog of isorenieratene were characterized in Belarussian petroleums. Devonian oils of low maturity were found to contain high con centrations (e.g., 35 mg/g) of C-40 diaryl isoprenoids (2,3,6-/3,4,5-trimethyl substitution) along with an abundance of maturation-related compounds. A maturation scheme for diaryl carotenoid (2,3,6-/3,4,5-trimethyl substitution) precursors was proposed. Diaryl isoprenoids and aryl isoprenoid (2,3,6- and 3,4,5-trimethyl substitutions) contents were found to decrease as a function of maturity. Maturity parameters based on (i) the ratio of two specific C-15 aryl isoprenoids and (ii) the ratio of C-15 (2,3,6) aryl isoprenoids to C-40 diaryl isoprenoids (2,3,6-/3,4,5) were proposed. (C) 1998 Elsevier Science Ltd. All rights reserved. C1 Netherlands Inst Sea Res, Dept Marine Biogeochem & Toxicol, NL-1790 AB Den Burg, Netherlands. US Geol Survey, Denver Fed Ctr, Denver, CO 80225 USA. RP Clifford, DJ (reprint author), Argonne Natl Lab, Div Chem, 9700 S Cass Ave, Argonne, IL 60439 USA. RI Sinninghe Damste, Jaap/F-6128-2011 OI Sinninghe Damste, Jaap/0000-0002-8683-1854 NR 29 TC 27 Z9 28 U1 1 U2 3 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0146-6380 J9 ORG GEOCHEM JI Org. Geochem. PY 1998 VL 29 IS 5-7 BP 1253 EP 1267 DI 10.1016/S0146-6380(98)00086-2 PG 15 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA 156HQ UT WOS:000077995900020 ER PT J AU Burnham, AK Sanborn, RH Gregg, HR AF Burnham, AK Sanborn, RH Gregg, HR TI Thermal dealkylation of dodecylbenzene and dodecylcyclohexane SO ORGANIC GEOCHEMISTRY LA English DT Article DE thermal decomposition; oil cracking; petroleum survival; maturation modeling ID PYROLYSIS; PETROLEUM; KINETICS; DECOMPOSITION; HYDROCARBONS; DESTRUCTION; HEXADECANE; GENERATION AB Rate constants for thermal decomposition of isotopically labeled dodecylbenzene and dodecylcyclohexane doped in n-C-16 and crude oil matrices were measured in sealed glass tubes at 310-360 degrees C. The rate varied by a factor of 1.5 in the various matrices, but there was no clear relationship with matrix composition. The decomposition rate of dodecylcyclohexane is very close to that of n-C-16, and comparison to literature data suggests that the activation energy is similar as well. The decomposition rate of dodecylbenzene is about 4 times faster than of n-C-16, and the activation energy may also be lower. This is consistent with the dealkylation of aromatics to form additional saturates as being a significant reaction during the early stages of oil maturation. Published by Elsevier Science Ltd. C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. RP Burnham, AK (reprint author), Univ Calif Lawrence Livermore Natl Lab, POB 808, Livermore, CA 94551 USA. EM burnhaml@lln1.gov NR 16 TC 12 Z9 13 U1 0 U2 4 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0146-6380 J9 ORG GEOCHEM JI Org. Geochem. PY 1998 VL 28 IS 11 BP 755 EP 758 DI 10.1016/S0146-6380(98)00032-1 PG 4 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA 111QE UT WOS:000075448500010 ER PT S AU Sellinger, A Weiss, PM Nguyen, A Lu, YF Assink, RA Brinker, CJ AF Sellinger, A Weiss, PM Nguyen, A Lu, YF Assink, RA Brinker, CJ BE Laine, RM Sanchez, C Brinker, CJ Giannelis, E TI Self-assembly of organic-inorganic nanocomposite coatings that mimic the structure of shell SO ORGANIC/INORGANIC HYBRID MATERIALS SE MATERIALS RESEARCH SOCIETY SYMPOSIUM PROCEEDINGS LA English DT Proceedings Paper CT Symposium on Organic/Inorganic Hybrid Materials at the 1998 MRS Spring Meeting CY APR 13-17, 1998 CL SAN FRANCISCO, CA SP Materials Res Soc (MRS) AB After over a decade of research, the efficient synthesis and processing of layered organic/inorganic nanocomposites that mimic bone and shell structures remains an elusive goal of the materials chemist. We report on a rapid, efficient, continuous method to form layered nanocomposites via evaporation induced supramolecular self-assembly (SSA). During dip coating of a homogeneous sol containing alcohol or ether solvents, silica precursors, organic monomers, initiators and surfactant (at an initial concentration below cmc), solvent evaporation induces the formation of micellar structures that co-organize with silica to form cubic, hexagonal or lamellar mesophases. The organic monomers and initiators are solvated within the hydrophobic micellar interiors. Subsequent photo or thermal polymerization and washing results in a silica/polymer thin film nanocomposite. The microstructural and physical characteristics of these materials will be discussed in the context of potential applications as abrasion resistant coatings and optical hosts. C1 Sandia Natl Labs, Albuquerque, NM 87106 USA. RP Sellinger, A (reprint author), Sandia Natl Labs, Albuquerque, NM 87106 USA. RI Sellinger, Alan/C-6250-2015 OI Sellinger, Alan/0000-0001-6705-1548 NR 0 TC 8 Z9 8 U1 1 U2 2 PU MATERIALS RESEARCH SOCIETY PI WARRENDALE PA 506 KEYSTONE DRIVE, WARRENDALE, PA 15088-7563 USA SN 0272-9172 BN 1-55899-425-4 J9 MATER RES SOC SYMP P PY 1998 VL 519 BP 95 EP 101 PG 7 WC Chemistry, Inorganic & Nuclear; Materials Science, Multidisciplinary; Materials Science, Biomaterials; Materials Science, Composites SC Chemistry; Materials Science GA BM12K UT WOS:000077686600012 ER PT S AU Nenoff, TM Chavez, AV Thoma, SG Provencio, P Harrison, WTA Phillips, MLF AF Nenoff, TM Chavez, AV Thoma, SG Provencio, P Harrison, WTA Phillips, MLF BE Laine, RM Sanchez, C Brinker, CJ Giannelis, E TI Amine templated zinc phosphates phases for membrane separations SO ORGANIC/INORGANIC HYBRID MATERIALS SE MATERIALS RESEARCH SOCIETY SYMPOSIUM PROCEEDINGS LA English DT Proceedings Paper CT Symposium on Organic/Inorganic Hybrid Materials at the 1998 MRS Spring Meeting CY APR 13-17, 1998 CL SAN FRANCISCO, CA SP Materials Res Soc (MRS) AB Our research is focused on developing inorganic molecular sieve membranes for light gas separations such as hydrogen recovery and natural gas purification, and organic molecular separations, such as chiral enantiomers. We focus on zinc phosphates because of the ease in crystallization of new phases and the wide range of pore sizes and shapes obtained. With our hybrid systems of zinc phosphate crystalline phases templated by amine molecules, we are interested in better understanding the association of the template molecules to the inorganic phase, and how the organic transfers its size, shape, and (in some cases) chirality to the bulk. Furthermore, the new porous phases can also be synthesized as thin films on metal oxide substrates. These films allow us to make membranes from our organic/inorganic hybrid systems; suitable for diffusion experiments. Characterization techniques for both the bulk phases and the thin films include powder X-ray diffraction, TGA, Scanning Electron Micrograph (SEM) and Electron Dispersive Spectrometry (EDS). C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Nenoff, TM (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU MATERIALS RESEARCH SOCIETY PI WARRENDALE PA 506 KEYSTONE DRIVE, WARRENDALE, PA 15088-7563 USA SN 0272-9172 BN 1-55899-425-4 J9 MATER RES SOC SYMP P PY 1998 VL 519 BP 125 EP 132 PG 8 WC Chemistry, Inorganic & Nuclear; Materials Science, Multidisciplinary; Materials Science, Biomaterials; Materials Science, Composites SC Chemistry; Materials Science GA BM12K UT WOS:000077686600016 ER PT B AU Forslund, DW George, JE Gavrilov, EM Staab, TA Weymouth, TE Kotha, S AF Forslund, DW George, JE Gavrilov, EM Staab, TA Weymouth, TE Kotha, S BE Nelson, R Gelish, A Mun, SK TI TeleMed: Development of a Java/CORBA-based virtual electronic medical record SO PACIFIC MEDICAL TECHNOLOGY SYMPOSIUM, PROCEEDINGS LA English DT Proceedings Paper CT Pacific Medical Technology Symposium (PACMEDTek) CY AUG 17-21, 1998 CL HONOLULU, HI SP Tripler Army Med Ctr AB Distributed computing is becoming commonplace in a variety of industries with healthcare being a particularly important one for society. We describe the development and deployment of TeleMed in a few healthcare domains. TeleMed is a 100% Java distributed application build on CORBA and OMG standards enabling the collaboration on the treatment of chronically ill patients in a secure manner over the Internet. These standards enable other systems to work interoperably with TeleMed[1] and provide transparent access to high performance distributed computing to the healthcare domain. The goal of wide scale integration of electronic medical records is a grand-challenge scale problem of global proportions with far-reaching social benefits. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Forslund, DW (reprint author), Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. OI Forslund, David/0000-0002-6534-3392 NR 6 TC 1 Z9 1 U1 0 U2 0 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 USA BN 0-8186-8667-7 PY 1998 BP 16 EP 19 DI 10.1109/PACMED.1998.767876 PG 2 WC Computer Science, Interdisciplinary Applications; Medical Informatics SC Computer Science; Medical Informatics GA BN33G UT WOS:000081642800003 ER PT B AU Zink, S Hahn, H Rudnick, J Snell, J Forslund, D AF Zink, S Hahn, H Rudnick, J Snell, J Forslund, D BE Nelson, R Gelish, A Mun, SK TI Rural telemedicine project in northern New Mexico SO PACIFIC MEDICAL TECHNOLOGY SYMPOSIUM, PROCEEDINGS LA English DT Proceedings Paper CT Pacific Medical Technology Symposium (PACMEDTek) CY AUG 17-21, 1998 CL HONOLULU, HI SP Tripler Army Med Ctr AB A virtual electronic medical record system is being deployed over the Internet with security in northern New Mexico using TeleMed, a multimedia medical records management system that uses CORBA-based client-server technology and distributed database architecture. The goal of the NNM Rural Telemedicine Project is to implement TeleMed into fifteen rural clinics and two hospitals within a 25,000 square mile area of northern New Mexico. Evaluation of the project consists of three components job task analysi, audit of immunized children, and time motion studies. Preliminary results of the evaluation components are presented. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87544 USA. RP Zink, S (reprint author), Univ Calif Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87544 USA. NR 6 TC 0 Z9 0 U1 0 U2 0 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 USA BN 0-8186-8667-7 PY 1998 BP 119 EP 124 DI 10.1109/PACMED.1998.767942 PG 4 WC Computer Science, Interdisciplinary Applications; Medical Informatics SC Computer Science; Medical Informatics GA BN33G UT WOS:000081642800019 ER PT B AU Bill, A Kresin, VZ Wolf, SA AF Bill, A Kresin, VZ Wolf, SA BE Kresin, VZ TI The isotope effect in superconductors SO PAIR CORRELATIONS IN MANY-FERMION SYSTEMS LA English DT Proceedings Paper CT Advanced Study Institute School on Pair Correlations in Many-Fermion Systems CY JUN 05-15, 1997 CL ERICE, ITALY AB We review some aspects of the isotope effect (IE) in superconductors. Our focus is on the influence of factors not related to the pairing mechanism. After summarizing the main results obtained for conventional superconductors, we review the effect of magnetic impurities, the proximity effect and non-adiabaticity on the value of the isotope coefficient (IC). We discuss the isotope effect of T-c and of the penetration depth delta. The theory is applied to conventional and high T-c superconductors. Experimental results obtained for YBa2Cu3O7-delta related materials (Zn and Pr-substituted as well as oxygen-depleted systems) and for La2-xSrxCuO4 are discussed. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Bill, A (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. NR 0 TC 10 Z9 10 U1 0 U2 0 PU PLENUM PRESS DIV PLENUM PUBLISHING CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA BN 0-306-45823-3 PY 1998 BP 25 EP 55 PG 31 WC Chemistry, Physical; Physics, Fluids & Plasmas; Physics, Atomic, Molecular & Chemical; Physics, Condensed Matter SC Chemistry; Physics GA BK68H UT WOS:000073074100002 ER PT B AU Kresin, V AF Kresin, V BE Kresin, VZ TI Non-adiabaticity and pairing in the finite systems SO PAIR CORRELATIONS IN MANY-FERMION SYSTEMS LA English DT Proceedings Paper CT Advanced Study Institute School on Pair Correlations in Many-Fermion Systems CY JUN 05-15, 1997 CL ERICE, ITALY C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Kresin, V (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU PLENUM PRESS DIV PLENUM PUBLISHING CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA BN 0-306-45823-3 PY 1998 BP 223 EP 233 PG 11 WC Chemistry, Physical; Physics, Fluids & Plasmas; Physics, Atomic, Molecular & Chemical; Physics, Condensed Matter SC Chemistry; Physics GA BK68H UT WOS:000073074100014 ER PT J AU Kazi, KMF Chornet, E AF Kazi, KMF Chornet, E TI A diffusion model for the chemical impregnation of hardwoods and its significance for rapid steam treatments SO PAPERI JA PUU-PAPER AND TIMBER LA English DT Article DE impregnation; diffusion; model; activation; chips; hardwood; pulping ID PENETRATION; CHIPS AB Through impregnation it is possible to bring the chemically reactive agents uniformly throughout the lignocellulosic matrix at a relatively low temperature. These preimpregnated chips can then be treated at higher temperatures (>200 degrees C) for a short period (2-4 minutes) via a rapid treatment process and a homogeneous product can be obtained. The impregnation of hardwood chips can be modeled by a diffusional mechanism. The diffusion coefficient is a function of temperature and pressure. It increases with pressure at a power of 0.38 in the radial direction and 0.27 in the axial direction. It increases exponentially with temperature following an Arrhenius type correlation: the activation energies for radial and axial thermal diffusion have been found to be 2.7 and 1.2 kJ/gmol, with diffusivity constants of 5.8x10(-7) and 2.0x10(-4) cm(2)/sec/K-1/2 respectively. C1 Univ Sherbrooke, Dept Genie Chim, Sherbrooke, PQ J1K 2R1, Canada. Natl Renewable Energy Lab, Golden, CO 80401 USA. RP Kazi, KMF (reprint author), Univ Sherbrooke, Dept Genie Chim, Sherbrooke, PQ J1K 2R1, Canada. NR 29 TC 6 Z9 7 U1 0 U2 0 PU FINNISH PAPER TIMBER PI HELSINKI PA SNELLMANINKATU 13, PL PO BOX 155, FIN-00171 HELSINKI, FINLAND SN 0031-1243 J9 PAP PUU-PAP TIM JI Pap. Ja Puu-Pap. Timber PY 1998 VL 80 IS 1 BP 41 EP 48 PG 8 WC Materials Science, Paper & Wood SC Materials Science GA YW028 UT WOS:000071888400014 ER PT S AU Dongarra, J Wassniewski, J AF Dongarra, J Wassniewski, J BE Rolim, J TI High performance linear algebra package LAPACK90 SO PARALLEL AND DISTRIBUTED PROCESSING SE LECTURE NOTES IN COMPUTER SCIENCE LA English DT Article; Proceedings Paper CT 10 IPPS/SPDP 98 Workshops Held in Conjunction with the 12th International Parallel Processing Symposium / 9th Symposium on Parallel Distributed Processing CY MAR 30-APR 03, 1998 CL ORLANDO, FLORIDA SP IEEE, Comp soc AB LAPACK90 is a set of FORTRAN90 subroutines which interfaces FORTRAN90 with LAPACK. All LAPACK driver subroutines (including expert drivers) and some LAPACK computationals have both generic LAPACK90 interfaces and generic LAPACK77 interfaces. The remaining computationals have only generic LAPACK77 interfaces. In both types of interfaces no distinction is made between single and double precision or between real and complex data types. C1 Univ Tennessee, Dept Comp Sci, Knoxville, TN 37996 USA. Oak Ridge Natl Lab, Math Sci Sect, Oak Ridge, TN 37831 USA. Tech Univ Denmark, Danish Comp Ctr Res & Educ UNIC, DK-2800 Lyngby, Denmark. RP Dongarra, J (reprint author), Univ Tennessee, Dept Comp Sci, 107 Ayres Hall, Knoxville, TN 37996 USA. NR 7 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER-VERLAG BERLIN PI BERLIN PA HEIDELBERGER PLATZ 3, D-14197 BERLIN, GERMANY SN 0302-9743 BN 3-540-64359-1 J9 LECT NOTES COMPUT SC PY 1998 VL 1388 BP 387 EP 391 PG 5 WC Computer Science, Theory & Methods SC Computer Science GA BM09F UT WOS:000077612600049 ER PT B AU Gropp, WD Keyes, DE McInnes, LC Tidriri, MD AF Gropp, WD Keyes, DE McInnes, LC Tidriri, MD BE Emerson, DR Ecer, A Periaux, J Satofuka, N TI Parallel implicit PDE computations: Algorithms and software SO PARALLEL COMPUTATIONAL FLUID DYNAMICS: RECENT DEVELOPMENTS AND ADVANCES USING PARALLEL COMPUTERS LA English DT Proceedings Paper CT Conference on Parallel Computational Fluid Dynamics - Recent Developments and Advances Using Parallel Computers CY MAY 19-21, 1997 CL MANCHESTER, ENGLAND SP Assoc European Res Estab Aeronaut, Silicon Graph, Cray Res, European Commiss DG III, ECCOMAS, Hitachi, IBM, NEC Corp, Daresbury Lab HPCI Ctr, High Performance Comp Engn Project AB Implicit solution methods are increasingly important in applications modeled by PDEs with disparate time and spatial scales. Meanwhile, the demand for high resolution with reasonable turnaround requires "routine" parallelization for such applications. The pseudo-transient matrix-free Newton-Krylov-Schwarz (Psi NKS) algorithmic framework is presented as an answer to these demands. We illustrate for three-dimensional transonic Euler flow about an M6 wing, on up to 64 processors of an IBM I rjP2 and a Gray T3E, that Psi NKS can simultaneously deliver: (1) globalized, asymptotically rapid con vergence through adaptive pseudo-transient continuation and Newton's method, (2) high per-processor performance through attention to distributed memory anti cache locality at the algorithmic level, and (3) reasonable parallelizability for an implicit method through favorable communication-to-computation scaling and deferred synchronization. Two disadvantages of Psi NKS methods are their sensitivity to the coding of the underlying PDE discretization and the large number of parameters that must be selected to govern convergence behavior. We therefore distill several recommendations from our experience with various algorithmic components of Psi NKS, and we describe a freely available, MPI-based portable parallel software implementation of the solver employed in our results. C1 Argonne Natl Lab, Div Math & Comp Sci, Argonne, IL 60639 USA. RP Gropp, WD (reprint author), Argonne Natl Lab, Div Math & Comp Sci, 9700 S Cass Ave, Argonne, IL 60639 USA. NR 0 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA SARA BURGERHARTSTRAAT 25, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS BN 0-444-82849-4 PY 1998 BP 333 EP 344 DI 10.1016/B978-044482849-1/50040-3 PG 12 WC Computer Science, Interdisciplinary Applications; Computer Science, Theory & Methods; Engineering, Chemical SC Computer Science; Engineering GA BL05S UT WOS:000074132800039 ER PT B AU Ma, H McCaffrey, J Piacsek, S AF Ma, H McCaffrey, J Piacsek, S BE Emerson, DR Ecer, A Periaux, J Satofuka, N TI A parallel implementation of a spectral element ocean model for simulating low-latitude circulation system SO PARALLEL COMPUTATIONAL FLUID DYNAMICS: RECENT DEVELOPMENTS AND ADVANCES USING PARALLEL COMPUTERS LA English DT Proceedings Paper CT Conference on Parallel Computational Fluid Dynamics - Recent Developments and Advances Using Parallel Computers CY MAY 19-21, 1997 CL MANCHESTER, ENGLAND SP Assoc European Res Estab Aeronaut, Silicon Graph, Cray Res, European Commiss DG III, ECCOMAS, Hitachi, IBM, NEC Corp, Daresbury Lab HPCI Ctr, High Performance Comp Engn Project AB This paper is about the parallel implementation of a high-resolution, spectral element: primitive equation model of a homogeneous equatorial ocean. The present work shows that the high-order domain decomposition methods can be efficiently implemented in a massively parallel computing environment to solve large-scale CFD problems, such as the general circulation of the ocean. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Ma, H (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA SARA BURGERHARTSTRAAT 25, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS BN 0-444-82849-4 PY 1998 BP 641 EP 648 DI 10.1016/B978-044482849-1/50077-4 PG 8 WC Computer Science, Interdisciplinary Applications; Computer Science, Theory & Methods; Engineering, Chemical SC Computer Science; Engineering GA BL05S UT WOS:000074132800076 ER PT S AU Brown, W Chapman, SC Grande, M Hardy, DA Singer, HJ Anderson, RR Reeves, GD AF Brown, W Chapman, SC Grande, M Hardy, DA Singer, HJ Anderson, RR Reeves, GD BE Blake, JB Slavin, JA TI Case studies of ion energisation events near substorm onset SO PARTICLE ACCELERATION IN SPACE PLASMAS SE ADVANCES IN SPACE RESEARCH LA English DT Article; Proceedings Paper CT D0 3 Symposium of COSPAR Scientific-Commission-D on Particle Acceleration in Space Plasmas at the 31st COSPAR Scientific Assembly CY JUL 14-21, 1996 CL UNIV BIRMINGHAM, BIRMINGHAM, ENGLAND SP Comm Space Res, Sci Comm Solar Terr Phys, European Space Agcy HO UNIV BIRMINGHAM ID CRRES AB In a recent one-dimensional self-consistent hybrid code simulation of the local dipolarisation of the initially distended magnetic field in the near-earth nightside region, (Richardson and Chapman, 1994), initially isotropic ions were accelerated up to twice the Alfven speed along the direction of the magnetic field. A bistreaming ion population was generated in the weak field region at the centre of the reversing held, and monostreaming ions were found to move away from the region of dipolarisation, Moreover, a bipolar signature in the cross tail component of the:field and fast magnetosonic waves propagating away from the reversal region are predicted by the simulation. We test these predictions by examining particle and magnetic field data from the Low Energy Plasma Analyser (LEPA) experiment and fluxgate magnetometer instrument onboard the Combined Release and Radiation Effects Satellite (CRRES), We examine a set of events that were found to be consistent with some of the features of the simulation results. (C) 1998 COSPAR. Published by Elsevier Science Ltd. C1 Univ Warwick, Space & Astrophys Grp, Coventry CV4 7AL, W Midlands, England. USAF, Phillips Lab, Bedford, MA 01731 USA. NOAA, RESE, Space Environm Lab, Boulder, CO 80303 USA. Univ Iowa, Iowa City, IA 52242 USA. Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. DRAL, Didcot, Oxon, England. RP Brown, W (reprint author), Univ Warwick, Space & Astrophys Grp, Coventry CV4 7AL, W Midlands, England. RI Chapman, Sandra/C-2216-2008; Reeves, Geoffrey/E-8101-2011; Grande, Manuel/C-2242-2013 OI Chapman, Sandra/0000-0003-0053-1584; Reeves, Geoffrey/0000-0002-7985-8098; Grande, Manuel/0000-0002-2233-2618 NR 5 TC 0 Z9 0 U1 0 U2 0 PU PERGAMON PRESS LTD PI OXFORD PA THE BOULEVARD LANGFORD LANE KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0273-1177 BN 0-08-043312-X J9 ADV SPACE RES PY 1998 VL 21 IS 4 BP 641 EP 644 DI 10.1016/S0273-1177(97)00976-9 PG 4 WC Engineering, Aerospace; Astronomy & Astrophysics; Geosciences, Multidisciplinary; Meteorology & Atmospheric Sciences; Physics, Fluids & Plasmas SC Engineering; Astronomy & Astrophysics; Geology; Meteorology & Atmospheric Sciences; Physics GA BL12R UT WOS:000074378900019 ER PT J AU Reece, CE AF Reece, CE TI Operating experience with superconducting cavities at Jefferson Lab SO PARTICLE ACCELERATORS LA English DT Article DE superconductivity; radiofrequency; cavities AB The CEBAF recirculating superconducting electron linac at Jefferson Lab is now in full operation supporting nuclear physics experiments in three target halls at up to 4.4 GeV. The 330 SRF cavities, operating at 2.0 K, continue to perform well above design specifications, and have accumulated over 8,000,000 operating cavity-hours. We have to date no evidence of degradation of cavity performance. The SRF cavities have demonstrated excellent reliability. The one-klystron-per-cavity design provides CEBAF with flexibility and redundancy for normal operations. Several techniques have been developed for establishing optimum operating conditions for the 330 independent systems. Operation of the cavities and control systems at the full design current of 1 mA has recently been achieved. The principal constraints on usable gradient for low-current operations are (1) discharge at the cold ceramic rf window induced by electron field emission in cavities, (2) tuner controls, and (3) stability of the waveguide vacuum in the region between the warm and cold windows. Several cryomodules have been improved by application of rf-helium processing while installed on the beamline.(1) C1 Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. RP Reece, CE (reprint author), Thomas Jefferson Natl Accelerator Facil, MS 58,12000 Jefferson Ave, Newport News, VA 23606 USA. NR 7 TC 0 Z9 0 U1 0 U2 0 PU GORDON BREACH SCI PUBL LTD PI READING PA C/O STBS LTD, PO BOX 90, READING RG1 8JL, BERKS, ENGLAND SN 0031-2460 J9 PART ACCEL JI Part. Accel. PY 1998 VL 60 IS 1-4 BP 43 EP 52 PG 10 WC Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Nuclear Science & Technology; Physics GA 167ZZ UT WOS:000078666800005 ER PT J AU Safa, H AF Safa, H TI High gradients in SCRF cavities SO PARTICLE ACCELERATORS LA English DT Article DE superconductivity; radiofrequency; cavities; high gradients ID PURIFICATION AB The two main limitations for achieving high gradients in superconducting radiofrequency cavities are the quench field level and the field emission threshold. This paper shows the successful progress obtained these last years while struggling to improve both figures. Field emission free cavities are now currently obtained up to 60 MV/m peak electric field and quench fields are pushed up to above 120 mT. While improving, a new unexpected limitation is starting to show up. At surface magnetic field levels over 100 mT, most cavities exhibit a strong slope in Q with increasing field. This Q-degradation will be the next step to overcome before reaching the theoretical limit on niobium cavities. C1 CEA Saclay, DSM, DAPNIA, SEA, F-91191 Gif Sur Yvette, France. RP Safa, H (reprint author), Univ Calif Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. NR 22 TC 0 Z9 0 U1 0 U2 0 PU GORDON BREACH SCI PUBL LTD PI READING PA C/O STBS LTD, PO BOX 90, READING RG1 8JL, BERKS, ENGLAND SN 0031-2460 J9 PART ACCEL JI Part. Accel. PY 1998 VL 60 IS 1-4 BP 219 EP + PG 13 WC Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Nuclear Science & Technology; Physics GA 167ZZ UT WOS:000078666800017 ER PT J AU Kneisel, P AF Kneisel, P TI A selection of higher gradient cavity experiments SO PARTICLE ACCELERATORS LA English DT Article DE superconductivity; radiofrequency; cavities; high gradients ID SUPERCONDUCTING CAVITIES AB In the two years since the 7th SRF workshop, a Variety of cavity tests have been carried out with the objective to reproducibly achieve surface electric rf fields above 40 MV/m with no or only very little electron loading. This paper reports about a collection of tests on single-cell and multi-cell cavities, which received standard surface treatments such as buffered chemical polishing and high pressure ultrapure water rinsing, but no heat treatments. Often the cavities were limited by quenches, posting a limit of 700-1000 Oe on achievable peak magnetic fields of high purity niobium of RRR values between 200 and 250. In a seamless single-cell cavity fabricated by V. Palmieri of INFN Legnaro by spinning, a very promising gradient of E-acc = 25 MV/m was measured. In collaboration with CERN, several tests on sputtered niobium prepared at CERN were also carried out, and accelerating gradients up to 25 MV/m were achieved. A single-cell cavity, electron beam welded after electrochemical buffing, showed only good performance - E-p > 50 MV/m - after the removal of more than 100 mu m of material. However, this cavity showed rather heavy Q disease even when cooled down rapidly; the Q degradation could be partially reversed by diffusing the oxygen from an anodized Nb2O5 layer into the niobium by heating the cavity in situ at T = 250 degrees C. C1 Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. RP Kneisel, P (reprint author), Thomas Jefferson Natl Accelerator Facil, 12000 Jefferson Ave, Newport News, VA 23606 USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU GORDON BREACH SCI PUBL LTD PI READING PA C/O STBS LTD, PO BOX 90, READING RG1 8JL, BERKS, ENGLAND SN 0031-2460 J9 PART ACCEL JI Part. Accel. PY 1998 VL 60 IS 1-4 BP 243 EP 256 PG 14 WC Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Nuclear Science & Technology; Physics GA 167ZZ UT WOS:000078666800019 ER PT J AU Ritson, D Chou, W AF Ritson, D Chou, W TI Minimizing the Pacman effect on the closed orbit SO PARTICLE ACCELERATORS LA English DT Article DE Pacman; beam-beam; LHC; orbit distortion; tune shift AB Pacman bunches, in storage rings, experience two deleterious effects: anomalous tune shifts and orbit displacements. The anomalous tune shifts result in larger effective tune spreads which, as is known, can be compensated by arranging crossing planes 90 degrees relative to each other at successive paired interaction points (IPs) separated by half the ring circumference. This paper evaluates the associated anomalous Pacman orbit displacements for such paired interaction points. The anomalous orbit displacements can in turn be minimized by setting the phase advance between the paired IPs to half the overall phase around the machine. Numerical results are evaluated for the LHC design parameters. The resultant displacements are small and should not significantly affect the LHC performance. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Chou, W (reprint author), Fermi Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 2 TC 0 Z9 0 U1 0 U2 0 PU GORDON BREACH SCI PUBL LTD PI READING PA C/O STBS LTD, PO BOX 90, READING RG1 8JL, BERKS, ENGLAND SN 0031-2460 J9 PART ACCEL JI Part. Accel. PY 1998 VL 59 IS 3-4 BP 157 EP 167 PG 11 WC Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Nuclear Science & Technology; Physics GA 125XN UT WOS:000076262500002 ER PT J AU Davidson, RC Chen, CP AF Davidson, RC Chen, CP TI Kinetic description of high-intensity beam propagation through a periodic focusing field based on the nonlinear Vlasov-Maxwell equations SO PARTICLE ACCELERATORS LA English DT Article DE collective effects; heavy ion accelerators; beam transport; particle dynamics AB A kinetic description of intense nonneutral beam propagation through a periodic solenoidal focusing field B-sol(x) = B-z(z)e(z) - (1/2)B-z'(z)(xe(x) + ye(y)) is developed, where B-z(z + S) = B-z(z) and S = const. is the axial periodicity length. The analysis is carried out for a thin beam with characteristic beam radius r(b) << S, and directed axial momentum gamma(b)m beta(b)c (in the z-direction) large compared with the transverse momentum and axial momentum spread of the beam particles. Making use of the nonlinear Vlasov-Maxwell equations for general distribution function f(b)(x, p, t) and self-consistent electrostatic field E-s(x, t) = -del phi(s)(x, t) consistent with the thin-beam approximation, the kinetic model is used to investigate detailed beam equilibrium properties for a variety of distributions functions. Examples are presented both for the case of a uniform solenoidal focusing field B-z(z) = B-0 = const. and for the case of a periodic solenoidal focusing field B-z(z + S) = B-z(z). The nonlinear Vlasov-Maxwell equations are simplified in the thin-beam approximation, and an alternative Hamiltonian formulation is developed that is particularly well-suited to intense beam propagation in periodic focusing systems. For the case of a uniform focusing field, the nonlinear Vlasov-Maxwell equations are used to investigate a wide variety of azimuthally symmetric (partial derivative/partial derivative theta = 0) intense beam equilibria characterized by partial derivative/partial derivative t = 0 = partial derivative/partial derivative z, ranging from distributions that are isotropic in momentum dependence in the frame of the beam, to anisotropic distributions in which the momentum spreads are different in the axial and transverse directions. As a general remark, for a uniform focusing field, it is found that there is enormous latitude in the choice of equilibrium distribution function f(b)(0), and the corresponding properties of the beam equilibrium. Introducing the axial coordinate s = z, use is made of the nonlinear Vlasov-Maxwell equations to investigate intense beam propagation in a periodic solenoidal field B-z(s + S) = B-z(s), in which case the properties of the beam are modulated as a function of s by the focusing field. The nonlinear Vlasov equation is transformed to a frame of reference rotating at the Larmor frequency Omega(L)(s) = -Z(i)eB(z)(s)/2 gamma(b)mc, and the description is further simplified by assuming azimuthal symmetry, in which case the canonical angular momentum is an exact single-particle constant of the motion. As an application of this general formalism, the specific example is considered of a periodically focused, rigid-rotor Vlasov equilibrium with step-function radial density profile and average azimuthal motion of the beam corresponding to a rigid rotation (in the Larmor frame) about the axis of symmetry. A wide range of beam properties are calculated, such as the average flow velocity, transverse temperature profile, and transverse thermal emittance. This example represents an important generalization of the familiar Kapchinskij-Vladimirskij beam distribution to allow for average beam rotation in the Larmor frame. Based on the present analysis, the Vlasov-Maxwell description of intense nonneutral beam propagation through a periodic solenoidal focusing field B-sol(x) is found to be remarkably tractable and rich in physics content. The Vlasov-Maxwell formalism developed here can be extended in a straightforward manner to investigate detailed stability behavior for perturbations about specific choices of beam equilibria. C1 Princeton Univ, Plasma Phys Lab, Princeton, NJ 08543 USA. RP Davidson, RC (reprint author), Princeton Univ, Plasma Phys Lab, POB 451,James Forrestal Campus, Princeton, NJ 08543 USA. NR 24 TC 40 Z9 40 U1 0 U2 0 PU GORDON BREACH SCI PUBL LTD PI READING PA C/O STBS LTD, PO BOX 90, READING RG1 8JL, BERKS, ENGLAND SN 0031-2460 J9 PART ACCEL JI Part. Accel. PY 1998 VL 59 IS 3-4 BP 175 EP 250 PG 76 WC Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Nuclear Science & Technology; Physics GA 125XN UT WOS:000076262500004 ER PT S AU Thurman-Keup, R AF Thurman-Keup, R BE Nieves, JF TI The measurement of the mass of the W boson from the Tevatron SO PARTICLE PHYSICS AND COSMOLOGY, FIRST TROPICAL WORKSHOP - HIGH ENERGY PHYSICS, SECOND LATIN AMERICAN SYMPOSIUM SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT 1st Tropical Workshop on Particle Physics and Cosmology (Tropical98)/2nd Latinamerican Symposium on High Physics (II-SILAFAE) CY APR 01-11, 1998 CL SAN JUAN, PR SP Amer Inst Phys AB This paper presents measurements of the mass of the W vector boson from the CDF and D empty set experiments using data collected at root s = 1.8 TeV during the 1994-1995 data taking run. CDF finds a preliminary mass of M-W = 80.43 +/- 0.16 GeV and D empty set measures a mass of M-W = 80.44 +/- 0.12 GeV. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Thurman-Keup, R (reprint author), Argonne Natl Lab, HEP-362,9700 S Cass Ave, Argonne, IL 60439 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0094-243X BN 1-56396-775-8 J9 AIP CONF PROC PY 1998 VL 444 BP 282 EP 293 PG 12 WC Astronomy & Astrophysics; Physics, Multidisciplinary; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA BM14M UT WOS:000077773200025 ER PT S AU King, BJ AF King, BJ BE Nieves, JF TI Muon colliders: New prospects for precision physics and the high energy frontier SO PARTICLE PHYSICS AND COSMOLOGY, FIRST TROPICAL WORKSHOP - HIGH ENERGY PHYSICS, SECOND LATIN AMERICAN SYMPOSIUM SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT 1st Tropical Workshop on Particle Physics and Cosmology (Tropical98)/2nd Latinamerican Symposium on High Physics (II-SILAFAE) CY APR 01-11, 1998 CL SAN JUAN, PR SP Amer Inst Phys AB An overview is given of muon collider technology and of the current status of the muon collider research program. The exciting potential of muon colliders for both neutrino physics and collider physics studies is then described and illustrated using self-consistent collider parameter sets at 0.1 TeV to 100 TeV center-of-mass energies. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP King, BJ (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0094-243X BN 1-56396-775-8 J9 AIP CONF PROC PY 1998 VL 444 BP 503 EP 519 PG 17 WC Astronomy & Astrophysics; Physics, Multidisciplinary; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA BM14M UT WOS:000077773200042 ER PT S AU Wang, MHLS Hartouni, EP Kreisler, MN Uribe, J Church, MD Gottschalk, EE Knapp, BC Stern, BJ Wiencke, LR Christian, DC Gutierrez, G Wehmann, A Avilez, C Felix, J Moreno, G Forbush, M Huson, FR White, JT AF Wang, MHLS Hartouni, EP Kreisler, MN Uribe, J Church, MD Gottschalk, EE Knapp, BC Stern, BJ Wiencke, LR Christian, DC Gutierrez, G Wehmann, A Avilez, C Felix, J Moreno, G Forbush, M Huson, FR White, JT CA BNL E766 Collaboration BE DOlivo, JC RuizAltaba, M Cendejas, LV TI Precision measurement of the Sigma(0) hyperon mass SO PARTICLES AND FIELDS: SIXTH MEXICAN WORKSHOP SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT 6th Mexican Workshop on Particles and Fields (VI-TMPC) CY NOV, 1997 CL MORELIA, MEXICO SP Ctr Invest & Estudios Avanzados, Ctr Lationamericano Fis, Mexico, Consejo Nacl Cienc & Tecnol, Mexico, Univ Guanajuato, Univ Jichacana San Nicolas Hidalgo, Univ Nacl Autonoma Mexico C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Wang, MHLS (reprint author), Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0094-243X BN 1-56396-791-X J9 AIP CONF PROC PY 1998 VL 445 BP 80 EP 89 PG 10 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA BM14C UT WOS:000077771200004 ER PT B AU Smoot, GF AF Smoot, GF BE Astbury, A Campbell, BA Khanna, FC Pinfold, JL TI Cosmic microwave background experiments SO PARTICLES AND THE UNIVERSE LA English DT Proceedings Paper CT 12th Lake Louise Winter Institute on Particles and the Universe CY FEB 16-22, 1997 CL LAKE LOUISE, CANADA SP Univ Alberta, Inst Particle Phys Canada, TRIUMP Users Grp, TRIUMP AB The cosmic microwave background (CMB) radiation provides a means to test the standard model of cosmology and determine its parameters with precision. Cosmology has made a great step forward with the observations and discoveries of the COBE satellite. These have been followed by a series of observations via balloon-borne and ground-based instrumentation. Now NASA and ESA have selected and approved new space missions: MAP and Planck (formerly called CO-BRAS/SAMBA) which may nearly reach the full potential of CMB observations. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Smoot, GF (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, MS 50-205, Berkeley, CA 94720 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA PO BOX 128 FARRER RD, SINGAPORE 9128, SINGAPORE BN 981-02-3467-8 PY 1998 BP 127 EP 182 PG 56 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA BL99T UT WOS:000077401500003 ER PT J AU Ziegler, R Cushing, AS Walpole, P Jasensky, RD Morimoto, H AF Ziegler, R Cushing, AS Walpole, P Jasensky, RD Morimoto, H TI Analogs of Manduca adipokinetic hormone tested in a bioassay and in a receptor-binding assay SO PEPTIDES LA English DT Article DE Manduca sexta; AKH; analogs; receptor binding assay; bioassay; competitors improve binding of M-AKH ID BOMBARDMENT MASS-SPECTROMETRY; FAT-BODY; CORPORA CARDIACA; GLYCOGEN-PHOSPHORYLASE; PERIPLANETA-AMERICANA; LOCUSTA-MIGRATORIA; LIPID-METABOLISM; SEXTA; INHIBITION; INSECT AB Single amino acid replacement analogs of Manduca adipokinetic hormone (M-AKH) pGlu-Leu-Thr-Phe-Thr-Ser-Ser-Trp-GlyNH(2) were tested for activity in bioassays as well as receptor binding assays. Amino acids were replaced by Ala and by D-analogs. In addition an extended M-AKH and analogs containing photo affinity labels were tested. All analogs had reduced activity. All the peptides which had enough activity to allow a full dose response curve reached the same maximal activity as native M-AKH. The use of analogs, in which L-Phe(4) was replaced by Ala or by D-Phe and of L-Thr(3) replaced by D-Thr, as competitors led to improved binding of M-AKH in our competitive receptor binding assay. In the bioassay an inactive concentration of Ala(4) M-AKH increased the activity of a half optimal concentration of native M-AKH. (C) 1998 Elsevier Science Inc. C1 Univ Arizona, Dept Biochem, Tucson, AZ 85721 USA. Univ Arizona, Ctr Insect Sci, Tucson, AZ 85721 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Natl Tritium Labelling Facil, Berkeley, CA 94720 USA. Univ Arizona, Arizona Res Labs, Div Biotechnol, Tucson, AZ 85721 USA. RP Ziegler, R (reprint author), Univ Halle Wittenberg, Inst Zool Anim Physiol, Dompl 4, D-06108 Halle, Germany. FU NCRR NIH HHS [PR41 RR01237]; NIGMS NIH HHS [GM 29238] NR 30 TC 10 Z9 11 U1 0 U2 2 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 USA SN 0196-9781 J9 PEPTIDES JI Peptides PY 1998 VL 19 IS 3 BP 481 EP 486 DI 10.1016/S0196-9781(97)00421-X PG 6 WC Biochemistry & Molecular Biology; Endocrinology & Metabolism; Pharmacology & Pharmacy SC Biochemistry & Molecular Biology; Endocrinology & Metabolism; Pharmacology & Pharmacy GA ZA658 UT WOS:000072388100007 PM 9533635 ER PT S AU Mazumder, P Trivedi, R Karma, A AF Mazumder, P Trivedi, R Karma, A BE Ma, E Atzmon, M Bellon, P Trivedi, R TI Mechanisms of layer structure formation in peritectic alloys SO PHASE TRANSFORMATIONS AND SYSTEMS DRIVEN FAR FROM EQUILIBRIUM SE MATERIALS RESEARCH SOCIETY SYMPOSIUM PROCEEDINGS LA English DT Proceedings Paper CT Symposium B on Phase Transformations and Systems Driven Far From Equilibrium at the Materials-Research-Society Fall Meeting CY DEC 01-05, 1997 CL BOSTON, MA SP Mat Res Soc, Energy Convers Devices Inc, Philips Electron Optics AB The mechanisms of layer structure formation in the two phase region of peritectic systems are discussed. Under diffusive growth conditions, a banded structure is predicted within a narrow composition range in the hypoperitectic composition. Experimental studies show the formation of an oscillatory structure in the hyperperitectic region. It is shown that this structure is induced by convection in the melt, and it is a novel structure in which a large single tree-like structure of primary phase is surrounded by the peritectic phase. Basic ideas of convection that lead to this tree-like morphology are described. C1 Iowa State Univ Sci & Technol, Ames Lab, US DOE, Ames, IA 50011 USA. RP Mazumder, P (reprint author), Iowa State Univ Sci & Technol, Ames Lab, US DOE, Ames, IA 50011 USA. NR 0 TC 9 Z9 9 U1 0 U2 0 PU MATERIALS RESEARCH SOCIETY PI WARRENDALE PA 506 KEYSTONE DRIVE, WARRENDALE, PA 15088-7563 USA SN 0272-9172 BN 1-55899-386-X J9 MATER RES SOC SYMP P PY 1998 VL 481 BP 39 EP 44 PG 6 WC Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Materials Science, Composites; Physics, Applied SC Materials Science; Physics GA BL45B UT WOS:000075555800006 ER PT S AU Chen, KC Kotula, PG Chu, FM Thoma, DJ AF Chen, KC Kotula, PG Chu, FM Thoma, DJ BE Ma, E Atzmon, M Bellon, P Trivedi, R TI Formation of a metastable bcc solid solution and decomposition to a C15 Laves phase in melt-spun CrNb10Ti10 SO PHASE TRANSFORMATIONS AND SYSTEMS DRIVEN FAR FROM EQUILIBRIUM SE MATERIALS RESEARCH SOCIETY SYMPOSIUM PROCEEDINGS LA English DT Proceedings Paper CT Symposium B on Phase Transformations and Systems Driven Far From Equilibrium at the Materials-Research-Society Fall Meeting CY DEC 01-05, 1997 CL BOSTON, MA SP Mat Res Soc, Energy Convers Devices Inc, Philips Electron Optics AB A metastable, disordered bcc phase has been formed from the melt in a Cr-rich alloy of the Nb-Cr-Ti system, where large volume fractions of the Laves phase would develop under equilibrium solidification conditions. X-ray diffraction (XRD) studies and lattice constant determinations confirm that the melt-spun ribbons contain a bcc phase beyond its terminal solid solution limits. Solidification pathways are proposed based upon metastable and equilibrium phase diagrams. Microstructures have been studied using optical microscopy, scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Cross-sectional TEM reveals tiny, dispersed Laves phase precipitates within the metastable bcc grains near the chill (wheel) side. Away from the wheel, the microstructure changes to a dendritic structure of the bcc and C15 Laves phase. Annealing of the melt-spun ribbons produces a fine, two-phase microstructure of the equilibrium phases. Microstructures from the melt-spun and are-melted processing conditions are compared. The microstructural control afforded through this metastable processing route enables a methodology to tailor phase distributions for optimized toughness in Laves phase alloys. C1 Univ Calif Los Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USA. RP Chen, KC (reprint author), Univ Calif Los Alamos Natl Lab, Div Mat Sci & Technol, Mail Stop G755, Los Alamos, NM 87545 USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU MATERIALS RESEARCH SOCIETY PI WARRENDALE PA 506 KEYSTONE DRIVE, WARRENDALE, PA 15088-7563 USA SN 0272-9172 BN 1-55899-386-X J9 MATER RES SOC SYMP P PY 1998 VL 481 BP 89 EP 94 PG 6 WC Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Materials Science, Composites; Physics, Applied SC Materials Science; Physics GA BL45B UT WOS:000075555800014 ER PT S AU Meldrum, A Boatner, LA Ewing, RC AF Meldrum, A Boatner, LA Ewing, RC BE Ma, E Atzmon, M Bellon, P Trivedi, R TI Phase transitions during ion-beam irradiation of the perovskite-structure oxides SO PHASE TRANSFORMATIONS AND SYSTEMS DRIVEN FAR FROM EQUILIBRIUM SE MATERIALS RESEARCH SOCIETY SYMPOSIUM PROCEEDINGS LA English DT Proceedings Paper CT Symposium B on Phase Transformations and Systems Driven Far From Equilibrium at the Materials-Research-Society Fall Meeting CY DEC 01-05, 1997 CL BOSTON, MA SP Mat Res Soc, Energy Convers Devices Inc, Philips Electron Optics AB Several perovskite-structure compounds, including CaTiO3, SnTiO3, BaTiO3, KNbO3, and KTaO3 were irradiated by 800 keV Kr+ ions in order to investigate and compare their response to heavy-ion irradiation. The critical amorphization temperature Tc, above which amorphization could not be induced, was found to increase in the order SrTiO3 --> CaTiO3 --> BaTiO3 --> KNbO3 --> KTaO3. No single physical parameter explains the observed sequence, although T-C correlates well with the melting temperatures. The well-known solid state phase transformations in these materials did not have a significant effect on the dose required for amorphization. Domain boundaries were observed in the pristine samples; however, after only a low dose, the boundaries became poorly defined and, with increasing dose, eventually disappeared. Dislocation loops were observed to aggregate at the domain boundaries. C1 Oak Ridge Natl Lab, Div Solid State, Oak Ridge, TN 37831 USA. RP Meldrum, A (reprint author), Oak Ridge Natl Lab, Div Solid State, MS-6057, Oak Ridge, TN 37831 USA. RI Boatner, Lynn/I-6428-2013 OI Boatner, Lynn/0000-0002-0235-7594 NR 0 TC 4 Z9 4 U1 0 U2 12 PU MATERIALS RESEARCH SOCIETY PI WARRENDALE PA 506 KEYSTONE DRIVE, WARRENDALE, PA 15088-7563 USA SN 0272-9172 BN 1-55899-386-X J9 MATER RES SOC SYMP P PY 1998 VL 481 BP 401 EP 406 PG 6 WC Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Materials Science, Composites; Physics, Applied SC Materials Science; Physics GA BL45B UT WOS:000075555800063 ER PT S AU Devanathan, R Weber, WJ Boatner, LA AF Devanathan, R Weber, WJ Boatner, LA BE Ma, E Atzmon, M Bellon, P Trivedi, R TI Response of zircon to electron and Ne+ irradiation SO PHASE TRANSFORMATIONS AND SYSTEMS DRIVEN FAR FROM EQUILIBRIUM SE MATERIALS RESEARCH SOCIETY SYMPOSIUM PROCEEDINGS LA English DT Proceedings Paper CT Symposium B on Phase Transformations and Systems Driven Far From Equilibrium at the Materials-Research-Society Fall Meeting CY DEC 01-05, 1997 CL BOSTON, MA SP Mat Res Soc, Energy Convers Devices Inc, Philips Electron Optics AB Zircon (ZrSiO4) is an actinide host phase in vitreous ceramic nuclear waste forms and a potential host phase for the disposition of excess weapons plutonium. In the present work, the effects of 800 and 900 keV electron, and 1 MeV Ne+ irradiations on the structure of single crystals of ZrSiO4 have been investigated. The microstructural evolution during the irradiations was studied in situ using a high-voltage electron microscope interfaced to an ion accelerator at Argonne National Laboratory. The results indicate that electron irradiation at 15 K cannot amorphize ZrSiO4 even at fluences an order of magnitude higher than that required for amorphization by 1.5 MeV Kr+ ions. However, the material is readily amorphized by 1 MeV Ne+ irradiation at 15 K. The temperature dependence of this amorphization is discussed in light of previous studies of radiation damage in ZrSiO4. C1 Battelle Mem Inst, Pacific NW Labs, Richland, WA 99352 USA. RP Devanathan, R (reprint author), Battelle Mem Inst, Pacific NW Labs, POB 999, Richland, WA 99352 USA. RI Weber, William/A-4177-2008; Boatner, Lynn/I-6428-2013; OI Weber, William/0000-0002-9017-7365; Boatner, Lynn/0000-0002-0235-7594; Devanathan, Ram/0000-0001-8125-4237 NR 0 TC 7 Z9 7 U1 0 U2 1 PU MATERIALS RESEARCH SOCIETY PI WARRENDALE PA 506 KEYSTONE DRIVE, WARRENDALE, PA 15088-7563 USA SN 0272-9172 BN 1-55899-386-X J9 MATER RES SOC SYMP P PY 1998 VL 481 BP 419 EP 424 PG 6 WC Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Materials Science, Composites; Physics, Applied SC Materials Science; Physics GA BL45B UT WOS:000075555800066 ER PT J AU Saxena, A Shenody, SR Bishop, AR Wu, Y Lookman, T AF Saxena, A Shenody, SR Bishop, AR Wu, Y Lookman, T TI Hierarchical microstructure in structural phase transitions SO PHASE TRANSITIONS LA English DT Article; Proceedings Paper CT Session on Phase Transitions, at the XVII Congress of the International-Union-of-Crystallography CY AUG 08-17, 1996 CL SEATTLE, WASHINGTON SP Int Union Crystallog DE martensite; twinning; tweed; time-dependent Ginzburg-Landau simulations ID SHAPE-MEMORY ALLOY; MARTENSITIC TRANSFORMATIONS; SPINODAL DECOMPOSITION; TWIN BOUNDARIES; TWEED; KINETICS; YBA2CU3O7-DELTA; PRECURSORS; DYNAMICS; SYSTEMS AB We consider a model in the context of martensitic materials in which hierarchical twinning near the habit plane (austenite-martensite interface) is a new and crucial ingredient. The model includes (1) a triple-well potential in local deviatoric (rectangular) strain, (2) strain gradient terms up to second order in strain and fourth order in gradient, and (3) all symmetry allowed compositional fluctuation-induced strain gradient terms. The last term favors branching of domain walls which enables communication between macroscopic and microscopic regions essential for shape memory. Below the transition temperature (To) we obtain the conditions under which branching of twins is energetically favorable. Above To a hierarchy of branched domain walls also stabilizes tweed formation (criss-cross patterns of twins). External stress or pressure modulates ("patterns") the spacing of domain walls. Results based on 2D time-dependent Ginzburg-Landau simulations are shown for twins, tweed and hierarchy formation. C1 Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. Univ Hyderabad, Sch Phys, Hyderabad 500134, Andhra Pradesh, India. Int Ctr Theoret Phys, I-34100 Trieste, Italy. Univ Western Ontario, Dept Math Appl, London, ON N6A 5B7, Canada. RP Saxena, A (reprint author), Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. NR 56 TC 1 Z9 1 U1 1 U2 2 PU GORDON BREACH SCI PUBL LTD PI READING PA C/O STBS LTD, PO BOX 90, READING RG1 8JL, BERKS, ENGLAND SN 0141-1594 J9 PHASE TRANSIT JI Phase Transit. PY 1998 VL 67 IS 3 BP 481 EP 498 DI 10.1080/01411599808227665 PN B PG 18 WC Crystallography; Physics, Condensed Matter SC Crystallography; Physics GA 187UJ UT WOS:000079806200003 ER PT J AU Schmidt, VH Trybula, Z Pinto, NJ Shapiro, SM AF Schmidt, VH Trybula, Z Pinto, NJ Shapiro, SM TI Phase coexistence in proton glass SO PHASE TRANSITIONS LA English DT Article; Proceedings Paper CT Session on Phase Transitions, at the XVII Congress of the International-Union-of-Crystallography CY AUG 08-17, 1996 CL SEATTLE, WASHINGTON SP Int Union Crystallog DE phase transition; ferroelectric; antiferroelectric; glass ID DEUTERON GLASSES; DYNAMICS; NMR; RB1-X(NH4)XH2ASO4 AB Proton glasses are crystals of composition M1-x(NW4)(x)W(2)AO(4), where M = K, Rb, Cs, W = H, D, A = P, As. For x = 0 there is a ferroelectric (FE) transition, while for x = 1 there is an antiferroelectric (AFE) transition. In both cases, the transition is from a paraelectric (PE) state of tetragonal structure with dynamically disordered hydrogen bonds to an ordered state of orthorhombic structure. For an intermediate x range there is no transition, but the hydrogen rearrangements slow down, and eventually display nonergodic behavior characteristic of glasses. We and others have shown from spontaneous polarization, dielectric permittivity, nuclear magnetic resonance, and neutron diffraction experiments that for smaller x there is coexistence of ferroelectric and paraelectric phases, and for larger x there is coexistence of antiferroelectric and paraelectric phases. We present a method for analytically describing this coexistence, and the degree to which this coexistence is spatial and/or temporal. We discuss also the experimental determination of these coexistence parameters. C1 Montana State Univ, Dept Phys, Bozeman, MT 59717 USA. Polish Acad Sci, Inst Mol Phys, Poznan, Poland. Univ Puerto Rico, Dept Phys & Elect, Humacao, PR 00661 USA. Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. RP Schmidt, VH (reprint author), Montana State Univ, Dept Phys, Bozeman, MT 59717 USA. NR 22 TC 6 Z9 6 U1 1 U2 1 PU GORDON BREACH SCI PUBL LTD PI READING PA C/O STBS LTD, PO BOX 90, READING RG1 8JL, BERKS, ENGLAND SN 0141-1594 J9 PHASE TRANSIT JI Phase Transit. PY 1998 VL 67 IS 3 BP 499 EP 520 DI 10.1080/01411599808227666 PN B PG 22 WC Crystallography; Physics, Condensed Matter SC Crystallography; Physics GA 187UJ UT WOS:000079806200004 ER PT J AU Chu, F Thoma, DJ Mitchell, TE Lin, CL Sob, M AF Chu, F Thoma, DJ Mitchell, TE Lin, CL Sob, M TI Phase stability of C15 MV2 (M = Zr, Hf or Ta): an electronic structure investigation SO PHILOSOPHICAL MAGAZINE B-PHYSICS OF CONDENSED MATTER STATISTICAL MECHANICS ELECTRONIC OPTICAL AND MAGNETIC PROPERTIES LA English DT Article ID LAVES-PHASE; ELASTIC PROPERTIES; MECHANICAL-PROPERTIES; TOTAL-ENERGY; DEFORMATION; ALLOYS AB The phase stability of HfV2-based C15 Laves phases has been studied by specific heat measurements and by in-situ transmission electron microscopy at low temperatures. The results indicate that HfV2 undergoes a structural transformation at approximately 115K and that Nb additions reduce the transformation temperature, eventually stabilizing the C15 structure. First-principles quantum-mechanical calculations based on the local-density functional theory have been performed to study the electronic structure and physical properties of C15 Laves phases MV2 (M = Zr, I-If or Ta). The density of states at the Fermi level N(E-F) and the Fermi surface geometry were obtained in order to understand the low-temperature phase instability of HfV2 and ZrV2 and the corresponding low-temperature stability of TaV2. We propose that a large N(EF) and Fermi surface nesting, which give rise to phonon softening, are the physical reasons for the structural instability of HfV2 and ZrV2 at low temperatures. The relationships between the anomalous elasticity and structural instability of HfV2 and ZrV2 are also discussed. C1 Univ Calif Los Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USA. Temple Univ, Dept Phys, Philadelphia, PA 19122 USA. Acad Sci Czech Republ, Inst Phys Mat, CZ-61662 Brno, Czech Republic. RP Chu, F (reprint author), Univ Calif Los Alamos Natl Lab, Div Mat Sci & Technol, MS-K765, Los Alamos, NM 87545 USA. RI Sob, Mojmir/D-1936-2012; Sob, Mojmir/G-6865-2011 NR 34 TC 23 Z9 23 U1 0 U2 3 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNPOWDER SQUARE, LONDON EC4A 3DE, ENGLAND SN 0141-8637 J9 PHILOS MAG B JI Philos. Mag. B-Phys. Condens. Matter Stat. Mech. Electron. Opt. Magn. Prop. PD JAN PY 1998 VL 77 IS 1 BP 121 EP 136 DI 10.1080/13642819808206387 PG 16 WC Materials Science, Multidisciplinary; Mechanics; Physics, Applied; Physics, Condensed Matter SC Materials Science; Mechanics; Physics GA YT345 UT WOS:000071592300009 ER PT J AU Jia, QX Smith, JL Chang, LH Anderson, WA AF Jia, QX Smith, JL Chang, LH Anderson, WA TI Characteristics of BaTiO3 thin films on Si deposited by rf magnetron sputtering SO PHILOSOPHICAL MAGAZINE B-PHYSICS OF CONDENSED MATTER STATISTICAL MECHANICS ELECTRONIC OPTICAL AND MAGNETIC PROPERTIES LA English DT Article ID FERROELECTRIC BATIO3; SILICON AB Thin films of BaTiO3 were deposited on single-crystal Si using rf magentron sputtering. Different microstructures resulted from varying the substrate temperature during sputtering or from post-annealing after film deposition. High trap and surface state densities at the interface between BaTiO3 and Si were found for the films deposited at room temperature even though such films showed a relatively low leakage current and a high breakdown voltage. These surface states or traps, nevertheless, could be partially annealed out of the film at a temperature around 450 degrees C. High deposition temperatures above 600 degrees C introduced unrecoverable surface states at the interface. BaTiO3 thin films that were deposited at a substrate temperature in the range 450-500 degrees C gave the best performance in terms of their electrical and interface properties. BaTiO3 thin-him capacitors with a configuration of Au/BaTiO3/p-Si/Al, fabricated with optimized BaTiO3 thin-him deposition conditions, showed a value of the dielectric constant near 30, a leakage-current density as low as 10(-7) A cm(-2) at a held intensity of 2 x 10(5) V cm(-1), a breakdown voltage above 10(6) V cm(-1) and an interface state density of around (4-6) x 10(11) eV(-1) cm(-2). C1 Univ Calif Los Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USA. SUNY Buffalo, Dept Elect & Comp Engn, Buffalo, NY 14260 USA. RP Jia, QX (reprint author), Univ Calif Los Alamos Natl Lab, Div Mat Sci & Technol, MS K763, Los Alamos, NM 87545 USA. RI Jia, Q. X./C-5194-2008 NR 25 TC 9 Z9 9 U1 0 U2 5 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNPOWDER SQUARE, LONDON EC4A 3DE, ENGLAND SN 0141-8637 J9 PHILOS MAG B JI Philos. Mag. B-Phys. Condens. Matter Stat. Mech. Electron. Opt. Magn. Prop. PD JAN PY 1998 VL 77 IS 1 BP 163 EP 175 DI 10.1080/13642819808206390 PG 13 WC Materials Science, Multidisciplinary; Mechanics; Physics, Applied; Physics, Condensed Matter SC Materials Science; Mechanics; Physics GA YT345 UT WOS:000071592300012 ER PT J AU Gulacsi, M Bishop, AR AF Gulacsi, M Bishop, AR TI Excitonic states in the one-dimensional Hubbard model SO PHILOSOPHICAL MAGAZINE LETTERS LA English DT Article ID METAL-INSULATOR-TRANSITION; COMPLEX WAVENUMBERS; EXCITATIONS; CHAIN; SYMMETRY AB We consider the charge excitations of the half-filled Hubbard chain, which are related to electron pairs occupying the same lattice site. In the exact Bethe Ansatz eigenfunction, we separate the centre-off-mass motion by introducing the centre-off-mass and relative coordinates and wave vectors. These excitations are then interpreted as interacting quasi-particles propagating as plane waves along the chain. The two-body problem is solved for these quasi-particles. The solution suggests the existence of bound pairs, namely particle-hole excitonic states. A connection to the magnon states of the ferromagnetic Heisenberg chain is also discussed. C1 Australian Natl Univ, Inst Adv Studies, Dept Theoret Phys, Canberra, ACT 0200, Australia. Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. RP Gulacsi, M (reprint author), Australian Natl Univ, Inst Adv Studies, Dept Theoret Phys, Canberra, ACT 0200, Australia. NR 30 TC 0 Z9 0 U1 1 U2 2 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNPOWDER SQUARE, LONDON EC4A 3DE, ENGLAND SN 0950-0839 J9 PHIL MAG LETT JI Philos. Mag. Lett. PD JAN PY 1998 VL 77 IS 1 BP 59 EP 67 DI 10.1080/095008398178778 PG 9 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA YT052 UT WOS:000071559200008 ER PT S AU Buttler, WT Hughes, RJ Kwiat, PG Lamoreaux, SK Luther, GG Morgan, GL Nordholt, JE Peterson, CG Simmons, CM AF Buttler, WT Hughes, RJ Kwiat, PG Lamoreaux, SK Luther, GG Morgan, GL Nordholt, JE Peterson, CG Simmons, CM BE Hotaling, SP Pirich, AR TI Free-space quantum key distribution at night SO PHOTONIC QUANTUM COMPUTING II SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT Conference on Photonic Quantum Computing II CY APR 15-16, 1998 CL ORLANDO, FL SP Soc Photo Opt Instrumentat Engineers DE cryptography; quantum cryptography; quantum key distribution; eavesdropping; parity check; privacy Amplification; Bennett 92; error detection; information security; satellite AB An experimental free-space quantum key distribution (QKD) system has been tested over an outdoor optical path of similar to 1 km under nighttime conditions at Los Alamos National Laboratory. This system employs the Bennett 92 protocol; here we give a brief overview of this protocol, and describe our experimental implementation of it. An analysis of the system efficiency is presented, as well as a description of our error detection protocol, which employs a two-dimensional parity check scheme. Finally, the susceptibility of this system to eavesdropping by various techniques is determined, and the effectiveness of privacy amplification procedures is discussed. Our conclusions are that free-space QKD is both effective and secure; possible applications include the rekeying of satellites in low earth orbit. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Buttler, WT (reprint author), Univ Calif Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. NR 0 TC 4 Z9 5 U1 0 U2 2 PU SPIE-INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA SN 0277-786X BN 0-8194-2834-5 J9 P SOC PHOTO-OPT INS PY 1998 VL 3385 BP 14 EP 22 DI 10.1117/12.312638 PG 9 WC Computer Science, Theory & Methods; Multidisciplinary Sciences; Optics SC Computer Science; Science & Technology - Other Topics; Optics GA BL36Q UT WOS:000075291500002 ER PT S AU Hetherington, DL Sniegowski, JJ AF Hetherington, DL Sniegowski, JJ BE Taylor, EW TI Improved polysilicon surface-micromachined micromirror devices using chemical-mechanical polishing SO PHOTONICS FOR SPACE ENVIRONMENTS VI SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT Conference on Photonics for Space Environments VI CY JUL 22, 1998 CL SAN DIEGO, CA SP Soc Photo Opt Instrumentat Engineers DE micro-optical components; micromirrors; planarization; chemical-mechanical polishing; CMP; adaptive optics; optical MEMS AB Surface polysilicon micromachined micromirrors require ultra-flat surfaces for advance optical applications such as adaptive optics. This paper details the planarization of micromirrors using chemical-mechanical polishing. We show that the increase in topography is due to a high temperature anneal step downstream From the CMP process itself. Two process alternatives were investigated: (I) perform a CMP step after the high temperature anneal step, and (2) perform a CMP step on the final polysilicon mirror surface. Both process alternatives produced acceptable flatness requirements for micromirror applications. C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Hetherington, DL (reprint author), Sandia Natl Labs, MS 1084, Albuquerque, NM 87185 USA. NR 0 TC 8 Z9 8 U1 0 U2 0 PU SPIE-INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA SN 0277-786X BN 0-8194-2895-7 J9 P SOC PHOTO-OPT INS PY 1998 VL 3440 BP 148 EP 153 DI 10.1117/12.326692 PG 6 WC Engineering, Aerospace; Engineering, Electrical & Electronic; Optics SC Engineering; Optics GA BM19V UT WOS:000078010000015 ER PT B AU Laible, PD Hanson, DK Thurnauer, MC Schiffer, M AF Laible, PD Hanson, DK Thurnauer, MC Schiffer, M BE Garab, G TI The protein's role in triplet energy transfer in bacterial reaction centers SO PHOTOSYNTHESIS: MECHANISMS AND EFFECTS, VOLS I-V LA English DT Proceedings Paper CT XIth International Congress on Photosynthesis - Mechanisms and Effects CY AUG 17-22, 1998 CL BUDAPEST, HUNGARY DE carotenoids; energy dissipation; EPR; sequence analysis; site-directed mutagenesis ID PHOTOSYNTHETIC REACTION-CENTER; RHODOBACTER-SPHAEROIDES; RESOLUTION; SPHEROIDENE C1 Argonne Natl Lab, Ctr Mechanist Biol & Biotechnol, Argonne, IL 60439 USA. RP Laible, PD (reprint author), Argonne Natl Lab, Ctr Mechanist Biol & Biotechnol, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 12 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER PI DORDRECHT PA PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS BN 0-7923-5547-4 PY 1998 BP 779 EP 782 PG 4 WC Biochemistry & Molecular Biology; Plant Sciences; Cell Biology SC Biochemistry & Molecular Biology; Plant Sciences; Cell Biology GA BP68A UT WOS:000085848500183 ER PT B AU Laible, PD Kirmaier, C Holten, D Tiede, DM Schiffer, M Hanson, DK AF Laible, PD Kirmaier, C Holten, D Tiede, DM Schiffer, M Hanson, DK BE Garab, G TI Formation of P(+)Q(B)(-) via B-branch electron transfer in mutant reaction centers SO PHOTOSYNTHESIS: MECHANISMS AND EFFECTS, VOLS I-V LA English DT Proceedings Paper CT XIth International Congress on Photosynthesis - Mechanisms and Effects CY AUG 17-22, 1998 CL BUDAPEST, HUNGARY DE electron transfer; reaction center; quinones; site-directed mutagenesis ID PHOTOSYNTHETIC REACTION-CENTER; BACTERIAL REACTION CENTERS; RHODOPSEUDOMONAS-VIRIDIS; CHARGE SEPARATION; RHODOBACTER-SPHAEROIDES; QUINONE; BACTERIOPHEOPHYTIN; MUTATIONS; SITE C1 Argonne Natl Lab, Ctr Mechanist Biol & Biotechnol, Argonne, IL 60439 USA. RP Laible, PD (reprint author), Argonne Natl Lab, Ctr Mechanist Biol & Biotechnol, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 18 TC 4 Z9 5 U1 0 U2 0 PU SPRINGER PI DORDRECHT PA PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS BN 0-7923-5547-4 PY 1998 BP 849 EP 852 PG 4 WC Biochemistry & Molecular Biology; Plant Sciences; Cell Biology SC Biochemistry & Molecular Biology; Plant Sciences; Cell Biology GA BP68A UT WOS:000085848500200 ER PT B AU Greenfield, SR Wasielewski, MR Seibert, M AF Greenfield, SR Wasielewski, MR Seibert, M BE Garab, G TI Femtosecond PSII reaction center studies at 7K SO PHOTOSYNTHESIS: MECHANISMS AND EFFECTS, VOLS I-V LA English DT Proceedings Paper CT XIth International Congress on Photosynthesis - Mechanisms and Effects CY AUG 17-22, 1998 CL BUDAPEST, HUNGARY DE charge separation; D1/D2-cyt-b-559; P680; pheophytins; transient absorption spectroscopy; ultrafast spectroscopy ID II REACTION CENTERS; PRIMARY CHARGE SEPARATION; PHOTOSYSTEM-II; TEMPERATURE C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Greenfield, SR (reprint author), Univ Calif Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. NR 5 TC 0 Z9 1 U1 0 U2 1 PU SPRINGER PI DORDRECHT PA PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS BN 0-7923-5547-4 PY 1998 BP 1029 EP 1032 PG 4 WC Biochemistry & Molecular Biology; Plant Sciences; Cell Biology SC Biochemistry & Molecular Biology; Plant Sciences; Cell Biology GA BP68A UT WOS:000085848500244 ER PT B AU Cinco, RM Fernandez, C Messinger, J Robblee, JH Visser, H McFarlane, KL Bergmann, U Glatzel, P Cramer, SP Sauer, K Klein, MP Yachandra, VK AF Cinco, RM Fernandez, C Messinger, J Robblee, JH Visser, H McFarlane, KL Bergmann, U Glatzel, P Cramer, SP Sauer, K Klein, MP Yachandra, VK BE Garab, G TI Refined model of the oxidation states and structures of the Mn/Ca/Cl cluster of the oxygen evolving complex of photosystem II. SO PHOTOSYNTHESIS: MECHANISMS AND EFFECTS, VOLS I-V LA English DT Proceedings Paper CT XIth International Congress on Photosynthesis - Mechanisms and Effects CY AUG 17-22, 1998 CL BUDAPEST, HUNGARY DE photosystem 2; X-ray spectroscopy; manganese cluster; O-2-evolution; S-states ID RAY-ABSORPTION-SPECTROSCOPY; MANGANESE CLUSTER; HISTIDINE; PLANTS C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Phys Biosci Div, Berkeley, CA 94720 USA. RP Cinco, RM (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Phys Biosci Div, Berkeley, CA 94720 USA. RI Fernandez, Carmen/C-9546-2012; Glatzel, Pieter/E-9958-2010; Institute of Chemistry - USP, Dept. of Chemistry/B-8988-2012 OI Fernandez, Carmen/0000-0003-2201-6241; Glatzel, Pieter/0000-0001-6532-8144; NR 14 TC 4 Z9 4 U1 0 U2 2 PU SPRINGER PI DORDRECHT PA PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS BN 0-7923-5547-4 PY 1998 BP 1273 EP 1278 PG 6 WC Biochemistry & Molecular Biology; Plant Sciences; Cell Biology SC Biochemistry & Molecular Biology; Plant Sciences; Cell Biology GA BP68A UT WOS:000085848500300 ER PT B AU Messinger, J Robblee, JH Fernandez, C Cinco, RM Visser, H Bergmann, U Glatzel, P Cramer, SP Campbell, KA Peloquin, JM Britt, RD Sauer, K Yachandra, VK Klein, MP AF Messinger, J Robblee, JH Fernandez, C Cinco, RM Visser, H Bergmann, U Glatzel, P Cramer, SP Campbell, KA Peloquin, JM Britt, RD Sauer, K Yachandra, VK Klein, MP BE Garab, G TI Oxidation states and structure of the manganese cluster in the S-0 state of the oxygen evolving complex SO PHOTOSYNTHESIS: MECHANISMS AND EFFECTS, VOLS I-V LA English DT Proceedings Paper CT XIth International Congress on Photosynthesis - Mechanisms and Effects CY AUG 17-22, 1998 CL BUDAPEST, HUNGARY DE photosystem 2; EPR; ESEEM; x-ray spectroscopy; S-states ID EPR MULTILINE SIGNAL; PHOTOSYSTEM-II; SPECTROSCOPY C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Phys Biosci Div, Berkeley, CA 94720 USA. RP Messinger, J (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Phys Biosci Div, Berkeley, CA 94720 USA. RI Fernandez, Carmen/C-9546-2012; Glatzel, Pieter/E-9958-2010; Institute of Chemistry - USP, Dept. of Chemistry/B-8988-2012 OI Fernandez, Carmen/0000-0003-2201-6241; Glatzel, Pieter/0000-0001-6532-8144; NR 16 TC 9 Z9 9 U1 0 U2 2 PU SPRINGER PI DORDRECHT PA PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS BN 0-7923-5547-4 PY 1998 BP 1279 EP 1282 PG 4 WC Biochemistry & Molecular Biology; Plant Sciences; Cell Biology SC Biochemistry & Molecular Biology; Plant Sciences; Cell Biology GA BP68A UT WOS:000085848500301 ER PT B AU Fernandez, C Cinco, RM Robblee, JH Messinger, J Pizarro, SA Sauer, K Klein, MP Yachandra, VK AF Fernandez, C Cinco, RM Robblee, JH Messinger, J Pizarro, SA Sauer, K Klein, MP Yachandra, VK BE Garab, G TI Calcium and chloride cofactors of the oxygen evolving complex - X-ray absorption spectroscopy evidence for a Mn/Ca/Cl heteronuclear cluster. SO PHOTOSYNTHESIS: MECHANISMS AND EFFECTS, VOLS I-V LA English DT Proceedings Paper CT XIth International Congress on Photosynthesis - Mechanisms and Effects CY AUG 17-22, 1998 CL BUDAPEST, HUNGARY DE photosystem 2; X-ray spectroscopy; O-2 evolution; manganese; calcium; chloride ID PHOTOSYNTHETIC WATER OXIDATION; PHOTOSYSTEM-II; MANGANESE CLUSTER; BINDING C1 Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Phys Biosci Div, Berkeley, CA 94720 USA. RP Fernandez, C (reprint author), Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Phys Biosci Div, Berkeley, CA 94720 USA. RI Fernandez, Carmen/C-9546-2012; Institute of Chemistry - USP, Dept. of Chemistry/B-8988-2012 OI Fernandez, Carmen/0000-0003-2201-6241; NR 14 TC 5 Z9 5 U1 0 U2 0 PU SPRINGER PI DORDRECHT PA PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS BN 0-7923-5547-4 PY 1998 BP 1399 EP 1402 PG 4 WC Biochemistry & Molecular Biology; Plant Sciences; Cell Biology SC Biochemistry & Molecular Biology; Plant Sciences; Cell Biology GA BP68A UT WOS:000085848500330 ER PT B AU Ghirardi, ML Flynn, T Forestier, M Iyer, A Melis, A Danielson, P Seibert, M AF Ghirardi, ML Flynn, T Forestier, M Iyer, A Melis, A Danielson, P Seibert, M BE Garab, G TI Generation of C. reinhardtii mutants that photoproduce H-2 from H2O in the presence of O-2 SO PHOTOSYNTHESIS: MECHANISMS AND EFFECTS, VOLS I-V LA English DT Proceedings Paper CT XIth International Congress on Photosynthesis - Mechanisms and Effects CY AUG 17-22, 1998 CL BUDAPEST, HUNGARY DE green algae; hydrogenase; mutants; genetic manipulation ID HYDROGEN C1 Natl Renewable Energy Lab, Golden, CO 80401 USA. RP Ghirardi, ML (reprint author), Natl Renewable Energy Lab, Golden, CO 80401 USA. NR 9 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER PI DORDRECHT PA PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS BN 0-7923-5547-4 PY 1998 BP 1959 EP 1962 PG 4 WC Biochemistry & Molecular Biology; Plant Sciences; Cell Biology SC Biochemistry & Molecular Biology; Plant Sciences; Cell Biology GA BP68A UT WOS:000085848500457 ER PT B AU Gray, GR Ivanov, AG Huner, NPA AF Gray, GR Ivanov, AG Huner, NPA BE Garab, G TI The influence of growth temperature and growth irradiance on thermal dissipation of excess excitation energy in winter rye SO PHOTOSYNTHESIS: MECHANISMS AND EFFECTS, VOLS I-V LA English DT Proceedings Paper CT XIth International Congress on Photosynthesis - Mechanisms and Effects CY AUG 17-22, 1998 CL BUDAPEST, HUNGARY DE light acclimation; non-photochemical quenching; photochemical quenching; photoinhibition; temperature acclimation; xanthophyll cycle ID XANTHOPHYLL CYCLE; PHOTOINHIBITION; PHOTOSYNTHESIS; ACCLIMATION; PLANTS; LIGHT; COLD C1 Michigan State Univ, US DOE, Plant Res Lab, E Lansing, MI 48824 USA. RP Gray, GR (reprint author), Michigan State Univ, US DOE, Plant Res Lab, E Lansing, MI 48824 USA. NR 13 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER PI DORDRECHT PA PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS BN 0-7923-5547-4 PY 1998 BP 2481 EP 2484 PG 4 WC Biochemistry & Molecular Biology; Plant Sciences; Cell Biology SC Biochemistry & Molecular Biology; Plant Sciences; Cell Biology GA BP68A UT WOS:000085848500581 ER PT B AU La Roche, J McKay, RM Boyd, P AF La Roche, J McKay, RM Boyd, P BE Garab, G TI Flavodoxin as an in situ marker for the detection of iron stress in marine phytoplankton from high nutrient low chlorophyll waters SO PHOTOSYNTHESIS: MECHANISMS AND EFFECTS, VOLS I-V LA English DT Proceedings Paper CT XIth International Congress on Photosynthesis - Mechanisms and Effects CY AUG 17-22, 1998 CL BUDAPEST, HUNGARY DE diatoms; environmental stress; ferredoxin; global climate changes; marine algae ID EQUATORIAL PACIFIC-OCEAN; SUB-ARCTIC PACIFIC; LIMITATION; GROWTH; PHOTOSYNTHESIS; PRODUCTIVITY; DIATOMS C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP La Roche, J (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 21 TC 0 Z9 0 U1 1 U2 1 PU SPRINGER PI DORDRECHT PA PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS BN 0-7923-5547-4 PY 1998 BP 3979 EP 3984 PG 6 WC Biochemistry & Molecular Biology; Plant Sciences; Cell Biology SC Biochemistry & Molecular Biology; Plant Sciences; Cell Biology GA BP68A UT WOS:000085848500922 ER PT B AU Wasielewski, MR Wiederrecht, GP Svec, WA Niemczyk, MP Hasharoni, K Galili, T Regev, A Levanon, H AF Wasielewski, MR Wiederrecht, GP Svec, WA Niemczyk, MP Hasharoni, K Galili, T Regev, A Levanon, H BE Garab, G TI Using synthetic model systems to understand charge separation and spin dynamics in photosynthetic reaction centers SO PHOTOSYNTHESIS: MECHANISMS AND EFFECTS, VOLS I-V LA English DT Proceedings Paper CT XIth International Congress on Photosynthesis - Mechanisms and Effects CY AUG 17-22, 1998 CL BUDAPEST, HUNGARY DE EPR; time-resolved spectroscopy; electron transfer ID ELECTRON-TRANSFER RATES; LIQUID-CRYSTALS; RADICAL PAIR C1 Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. RP Wasielewski, MR (reprint author), Argonne Natl Lab, Div Chem, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 11 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER PI DORDRECHT PA PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS BN 0-7923-5547-4 PY 1998 BP 4193 EP 4200 PG 8 WC Biochemistry & Molecular Biology; Plant Sciences; Cell Biology SC Biochemistry & Molecular Biology; Plant Sciences; Cell Biology GA BP68A UT WOS:000085848500972 ER PT J AU Cohen, MF Meeks, JC Cai, YA Wolk, CP AF Cohen, MF Meeks, JC Cai, YA Wolk, CP TI Transposon mutagenesis of heterocyst-forming filamentous cyanobacteria SO PHOTOSYNTHESIS: MOLECULAR BIOLOGY OF ENERGY CAPTURE SE METHODS IN ENZYMOLOGY LA English DT Review ID SP-STRAIN PCC-7120; ANABAENA SP; INSERTION SEQUENCES; NITROGEN-FIXATION; CONJUGAL TRANSFER; ESCHERICHIA-COLI; ANTHOCEROS-PUNCTATUS; GENE-PRODUCT; NOSTOC; MUTANTS C1 Univ Calif Davis, Microbiol Sect, Div Biol Sci, Davis, CA 95616 USA. Univ Calif Berkeley, Dept Cell & Mol Biol, Berkeley, CA 94720 USA. Michigan State Univ, US DOE, Plant Res Lab, E Lansing, MI 48824 USA. RP Cohen, MF (reprint author), Univ Calif Davis, Microbiol Sect, Div Biol Sci, Davis, CA 95616 USA. NR 54 TC 25 Z9 26 U1 0 U2 2 PU ACADEMIC PRESS INC PI SAN DIEGO PA 525 B STREET, SUITE 1900, SAN DIEGO, CA 92101-4495 USA SN 0076-6879 J9 METHOD ENZYMOL JI Methods Enzymol. PY 1998 VL 297 BP 3 EP 17 PG 15 WC Biochemical Research Methods; Biochemistry & Molecular Biology; Plant Sciences SC Biochemistry & Molecular Biology; Plant Sciences GA BL66F UT WOS:000076214200001 ER PT J AU Yu, JP McIntosh, L AF Yu, JP McIntosh, L TI Isolation and genetic characterization of pseudorevertants from site-directed PSI mutants in Synechocystis 6803 SO PHOTOSYNTHESIS: MOLECULAR BIOLOGY OF ENERGY CAPTURE SE METHODS IN ENZYMOLOGY LA English DT Review ID PHOTOSYNTHETIC REACTION-CENTER; I REACTION-CENTER; PHOTOSYSTEM-I; SP PCC-6803; PSAC; COMPLEX; CORE C1 Michigan State Univ, US DOE, Plant Res Lab, Dept Biochem, E Lansing, MI 48824 USA. RP Yu, JP (reprint author), Michigan State Univ, US DOE, Plant Res Lab, Dept Biochem, E Lansing, MI 48824 USA. NR 19 TC 3 Z9 3 U1 0 U2 0 PU ACADEMIC PRESS INC PI SAN DIEGO PA 525 B STREET, SUITE 1900, SAN DIEGO, CA 92101-4495 USA SN 0076-6879 J9 METHOD ENZYMOL JI Methods Enzymol. PY 1998 VL 297 BP 18 EP 26 PG 9 WC Biochemical Research Methods; Biochemistry & Molecular Biology; Plant Sciences SC Biochemistry & Molecular Biology; Plant Sciences GA BL66F UT WOS:000076214200002 ER PT J AU Bautista, JA Chynwat, V Cua, A Jansen, FJ Lugtenburg, J Gosztola, D Wasielewski, MR Frank, HA AF Bautista, JA Chynwat, V Cua, A Jansen, FJ Lugtenburg, J Gosztola, D Wasielewski, MR Frank, HA TI The spectroscopic and photochemical properties of locked-15,15 '-cis-spheroidene in solution and incorporated into the reaction center of Rhodobacter sphaeroides R-26.1 SO PHOTOSYNTHESIS RESEARCH LA English DT Article DE carotenoid; electron spin resonance; energy transfer; geometric isomerization; optical spectroscopy; photoprotection; triplet state ID MODIFIED BACTERIOCHLOROPHYLL PIGMENTS; CAROTENOID TRIPLET-STATES; CIS-TRANS ISOMERS; ENERGY-GAP LAW; RHODOPSEUDOMONAS-SPHAEROIDES; RESONANCE RAMAN; PHOTOSYNTHETIC BACTERIA; RHODOSPIRILLUM-RUBRUM; BETA-CAROTENE; PRIMARY DONOR AB The spectroscopic and photochemical properties of the synthetic carotenoid, locked-15,15'-cis-spheroidene, were studied by absorption, fluorescence, circular dichroism, fast transient absorption and electron spin resonance spectroscopies in solution and after incorporation into the reaction center of Rhodobacter (Rb.) sphaeroides R-26.1. HPLC purification of the synthetic molecule reveals the presence of several di-cis geometric isomers in addition to0 the mono-cia isomer of locked-15,15'-cis-spheroidene. In solution, the absorption spectrum of the purified mono-cis sample was red-shifted and showed a large cis-peak at 351 nm compared to unlocked all-trans spheroidene. Molecular modeling and semi-empirical calculations reveal how geometric isomerization and structural factors affect the room temperature spectra. The spectroscopic studies of the purified locked-15,15'-mono-cis molecule in solution reveal a more stable manifold of excited states compared to the unlocked spheroidene. Reaction centers of Rb. sphaeroides R-26.1 in which the locked-15,15'-cis-spheroidene was incorporated show no difference in either the spectroscopic properties or photochemistry compared to reaction centers in which unlocked spheroidene was incorporated or to Rb. sphaeroides wild type strain 2.4.1 reaction centers which naturally contain spheroidene. The data suggest that the natural selection of a cis-isomer of spheroidene for incorporation into native reaction centers of Rb. sphaeroides wild type strain 2.4.1 is more determined by the structure or assembly of the reaction center protein than by any special quality of the cis-isomer of the carotenoid that would affect its ability to participate in triplet energy transfer or carry out photoprotection. C1 Univ Connecticut, Dept Chem, Storrs, CT 06269 USA. Leiden Univ, Gorlaeus Labs, NL-2300 RA Leiden, Netherlands. Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. Northwestern Univ, Dept Chem, Evanston, IL 60208 USA. RP Frank, HA (reprint author), Univ Connecticut, Dept Chem, 215 Glenbrook Rd, Storrs, CT 06269 USA. RI Gosztola, David/D-9320-2011 OI Gosztola, David/0000-0003-2674-1379 NR 58 TC 26 Z9 28 U1 0 U2 7 PU SPRINGER PI DORDRECHT PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS SN 0166-8595 EI 1573-5079 J9 PHOTOSYNTH RES JI Photosynth. Res. PD JAN PY 1998 VL 55 IS 1 BP 49 EP 65 DI 10.1023/A:1005955425420 PG 17 WC Plant Sciences SC Plant Sciences GA ZE614 UT WOS:000072812200003 ER PT J AU Muslin, EH Stevens, FJ Anderson, LE AF Muslin, EH Stevens, FJ Anderson, LE TI New domain-locking disulfide in a bacterial malate dehydrogenase strengthens proposed mechanism for reductive activation of the chloroplast enzyme SO PHOTOSYNTHESIS RESEARCH LA English DT Article DE domain-locking disulfides; light activation; redox-sensitive cysteines; reductive activation ID ESCHERICHIA-COLI; C-4 PHOTOSYNTHESIS; PROTEIN; NADP; PURIFICATION; BINDING; SITE AB Light-dependent reduction of cystine disulfide bonds results in activation of several of the enzymes of photosynthetic carbon metabolism within the chloroplast. Tertiary structure modeling suggests that the redox-sensitivity of the chloroplast malate dehydrogenase (EC 1.1.1.82) is due to disulfide crosslinking of the carbon substrate and nucleotide-binding domains. Consistent with this suggestion, introduction of Cys residues in opposition to one another on the two domains of the Escherichia coli enzyme results in redox-sensitivity [Muslin EH et al. (1995) Biophys J 68: 2218-2223]. We have now substituted Cys residues into the bacterial malate dehydrogenase (EC 1.1.1.37) in positions that correspond more exactly to those postulated to be responsible for the redox-sensitivity of the chloroplast enzyme. The introduction of one pair of Cys residues renders the enzyme redox-sensitive, but the introduction of the alternate pair does not. Energy minimization calculations suggest that the difference in redox-sensitivity is consistent with differences in the energy required for formation of the disulfide bond. C1 Univ Illinois, Dept Biol Sci, Chicago, IL 60607 USA. Argonne Natl Lab, Ctr Mechanist Biol & Biotechnol, Argonne, IL 60439 USA. RP Anderson, LE (reprint author), Univ Illinois, Dept Biol Sci, Chicago, IL 60607 USA. NR 18 TC 3 Z9 3 U1 0 U2 1 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0166-8595 J9 PHOTOSYNTH RES JI Photosynth. Res. PD JAN PY 1998 VL 55 IS 1 BP 75 EP 82 DI 10.1023/A:1005921006765 PG 8 WC Plant Sciences SC Plant Sciences GA ZE614 UT WOS:000072812200005 ER PT J AU Tanner, DB Liu, HL Quijada, MA Zibold, AM Berger, H Kelley, RJ Onellion, M Chou, FC Johnston, DC Rice, JP Ginsberg, DM Markert, JT AF Tanner, DB Liu, HL Quijada, MA Zibold, AM Berger, H Kelley, RJ Onellion, M Chou, FC Johnston, DC Rice, JP Ginsberg, DM Markert, JT TI Superfluid and normal fluid density in high-T-c superconductors SO PHYSICA B LA English DT Article; Proceedings Paper CT International Conference on Low Energy Electrodynamics in Solids (LEES 97) CY JUL 06-11, 1997 CL MONTE VERITA, SWITZERLAND DE superconductivity; optical properties; high-temperature superconductors; far-infrared spectroscopy ID OPTICAL CONDUCTIVITY; ELECTRONIC-STRUCTURE; INFRARED PROPERTIES; PENETRATION-DEPTH; GROWTH; PHENOMENOLOGY; LA2CUO4+DELTA; LA2-XSRXCUO4; REFLECTIVITY; CRYSTALS AB The electronic properties of the cuprate superconductors have been studied by measuring the reflectance over the frequency range from the far-infrared to the near-ultraviolet (roughly, 10 meV-5 eV). There is an interesting behavior in both the normal state and the superconducting state. In the normal state, there is the well-known non-Drude distribution of the doping-induced spectral weight. In the superconducting state, the spectral weight of the superconducting condensate correlates with T-c in a variety of materials. Remarkably, in optimally doped superconductors, only about 20% of the doping-induced carriers joins the superfluid; the rest of the spectral weight remains at finite frequencies. (C) 1998 Elsevier Science B.V. All rights reserved. C1 Univ Florida, Dept Phys, Gainesville, FL 32611 USA. Ecole Polytech Fed Lausanne, Inst Phys Appl, CH-1015 Lausanne, Switzerland. Univ Wisconsin, Dept Phys, Madison, WI 53706 USA. Iowa State Univ, Ames Lab, Ames, IA 50011 USA. Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA. Univ Illinois, Dept Phys, Urbana, IL 61801 USA. Univ Texas, Dept Phys, Austin, TX 78712 USA. RP Tanner, DB (reprint author), Univ Florida, Dept Phys, Gainesville, FL 32611 USA. NR 38 TC 30 Z9 30 U1 1 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD JAN PY 1998 VL 244 BP 1 EP 8 DI 10.1016/S0921-4526(97)00453-5 PG 8 WC Physics, Condensed Matter SC Physics GA YV935 UT WOS:000071879200002 ER PT J AU Kruer, WL Afeyan, BB Chou, AE Kirkwood, RK Montgomery, DS Rambo, PW Wilks, SC AF Kruer, WL Afeyan, BB Chou, AE Kirkwood, RK Montgomery, DS Rambo, PW Wilks, SC TI Interplay between laser plasma instabilities SO PHYSICA SCRIPTA LA English DT Article; Proceedings Paper CT International Topical Conference on Plasma Physics - New Perspectives of Collective Effects CY NOV 10-14, 1997 CL TRIESTE, ITALY SP ASICTP, IUPAP ID STIMULATED RAMAN-SCATTERING; ION-ACOUSTIC-WAVES; BRILLOUIN-SCATTERING; HOHLRAUM PLASMAS; ENERGY-TRANSFER; SATURATION; TURBULENCE; DEPENDENCE; FREQUENCY; LANGMUIR AB Experiments have exhibited a very rich interplay between laser plasma instabilities. We examine two simple examples to illustrate how laser-driven waves can either directly influence one another or exhibit correlated behavior. Related experiments are discussed. Scaling based on instability gain using linear Landau damping rates is shown to be generally inadequate. Lastly we note that modified electron distributions due to collisional and nonlocal heat transport can be important to include in the zeroth order description. C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. Univ Nevada, Reno, NV 89557 USA. Univ Calif Los Angeles, Los Angeles, CA USA. Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Kruer, WL (reprint author), Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. OI Montgomery, David/0000-0002-2355-6242 NR 29 TC 7 Z9 7 U1 0 U2 3 PU ROYAL SWEDISH ACAD SCIENCES PI STOCKHOLM PA PUBL DEPT BOX 50005, S-104 05 STOCKHOLM, SWEDEN SN 0281-1847 J9 PHYS SCRIPTA JI Phys. Scr. PY 1998 VL T75 BP 7 EP 10 DI 10.1238/Physica.Topical.075a00007 PG 4 WC Physics, Multidisciplinary SC Physics GA 112AZ UT WOS:000075472700002 ER PT J AU Brandt, S Priedhorsky, WC Fenimore, EE Moss, CE Black, K Kelley, RL Stillwell, D Birsa, F Borozdin, KN Kaniovsky, A Arefiev, VA Efremov, V AF Brandt, S Priedhorsky, WC Fenimore, EE Moss, CE Black, K Kelley, RL Stillwell, D Birsa, F Borozdin, KN Kaniovsky, A Arefiev, VA Efremov, V TI The MOXE all sky X-ray monitor SO PHYSICA SCRIPTA LA English DT Article; Proceedings Paper CT Nordic Conference in Theoretical High Energy Astrophysics CY SEP 14-16, 1997 CL COPENHAGEN, DENMARK SP Danish Space Res Inst, Nord Inst Theoret Phys, Nord Acad Adv Study ID TRANSIENT AB MOXE (MOnitoring X-ray Experiment) is the all-sky X-ray monitor on the Spectrum-X-Gamma astrophysical observatory. The six MOXE pinhole cameras will enable almost continous observation of more than 95% of the sky in the 2-25 keV energy band. The scientific objectives of MOXE are to detect transient X-ray sources for follow-up by instruments on SXG or by other observers, as well as to study the time variability of X-ray sources. With a sensitivity of approximate to 3 mCrab (5 sigma) most of the observed persistent sources will be Galactic X-ray binaries. MOXE will be well suited as a partner in multi-wavelength campaigns. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA. IKI, Moscow, Russia. RP Brandt, S (reprint author), Univ Calif Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. EM sbrandt@lanl.gov RI Kelley, Richard/K-4474-2012; OI Priedhorsky, William/0000-0003-0295-9138 NR 21 TC 1 Z9 1 U1 0 U2 0 PU ROYAL SWEDISH ACAD SCIENCES PI STOCKHOLM PA PUBL DEPT BOX 50005, S-104 05 STOCKHOLM, SWEDEN SN 0281-1847 J9 PHYS SCRIPTA JI Phys. Scr. PY 1998 VL T77 BP 21 EP 24 DI 10.1088/0031-8949/1998/T77/003 PG 4 WC Physics, Multidisciplinary SC Physics GA 150TA UT WOS:000077680300005 ER PT J AU Csanak, G Cartwright, DC Kazantsev, SA Bray, I AF Csanak, G Cartwright, DC Kazantsev, SA Bray, I TI Impact polarization and alignment creation parameters via stepwise excitation processes SO PHYSICA SCRIPTA LA English DT Article; Proceedings Paper CT 29th Annual Conference of the European-Group-for-Atomic-Spectroscopy CY JUL 15-18, 1997 CL TU BERLIN, OPT INST, BERLIN, GERMANY SP European Grp Atom Spect HO TU BERLIN, OPT INST ID EXCITED ATOMIC TARGETS; MANY-BODY THEORY; ELECTRON-SCATTERING; METASTABLE-HELIUM AB We report here results from first order many body theory, distorted wave approximation, and converged dose coupling calculations for polarization fractions and alignment creation parameters in the case of 2 S-1 --> n P-1(n = 3 - 5), 2 S-3 --> n P-1(n = 2 - 5), 2 S-1 --> n D-1(n = 3 - 5), 2 S-3 --> n D-1(n = 3 - 5), 2 S-3 --> n D-3(n = 3 - 5), and 2 S-1 --> n D-3(n = 3 - 5) excitations in helium for electron impact energies from threshold to several hundred eV. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. St Petersburg State Univ, Inst Phys, St Petersburg 199034, Russia. Observ Paris, DASOP, F-92195 Meudon, France. Flinders Univ S Australia, Elect Struct Mat Ctr, Adelaide, SA 5001, Australia. RP Csanak, G (reprint author), Univ Calif Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. RI Bray, Igor/B-8586-2009 OI Bray, Igor/0000-0001-7554-8044 NR 22 TC 4 Z9 4 U1 0 U2 0 PU ROYAL SWEDISH ACAD SCIENCES PI STOCKHOLM PA PUBL DEPT BOX 50005, S-104 05 STOCKHOLM, SWEDEN SN 0281-1847 J9 PHYS SCRIPTA JI Phys. Scr. PY 1998 VL T78 BP 47 EP 53 DI 10.1238/Physica.Topical.078a00047 PG 7 WC Physics, Multidisciplinary SC Physics GA 150TB UT WOS:000077680400008 ER PT J AU Birn, J Hesse, M AF Birn, J Hesse, M TI Substorm dynamics in the magnetotail SO PHYSICA SCRIPTA LA English DT Article ID THIN CURRENT SHEETS; TAIL CURRENT DISRUPTION; FIELD-ALIGNED CURRENTS; PLASMA SHEET; GROWTH-PHASE; ION; RECONNECTION; MECHANISM; REGION; MODEL AB The large-scale dynamic evolution of the magnetotail in relation to substorms is most commonly understood and described in terms of magnetic reconnection, neutral line formation, and plasmoid ejection into the distant tail as wall as current disruption and diversion in the inner tail. Recent magnetohydrodynamic simulations have shown that the two aspects, which are often considered as alternative models, may well he part of one unstable process. We review the most recent update of this model A new element, which has been strongly emphasized recently by observations as well as simulations, is the formation of a thin current sheet in the inner tail during the late substorm growth phase. This presumably eases the onset of instability, although the actual mechanism has not been clearly identified. The basic concept of a large-scale instability, involving the local breakdown of ideal MHD, has not changed significantly. However, recent MHD simulations as well as test particle investigations have put mom emphasis on the role of the near tail region in providing current diversion ("disruption") and particle acceleration. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM USA. RP Birn, J (reprint author), NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA. RI Hesse, Michael/D-2031-2012 NR 41 TC 0 Z9 0 U1 0 U2 1 PU ROYAL SWEDISH ACAD SCIENCES PI STOCKHOLM PA PUBL DEPT BOX 50005, S-104 05 STOCKHOLM, SWEDEN SN 0281-1847 J9 PHYS SCRIPTA JI Phys. Scr. PY 1998 VL T74 BP 58 EP 62 DI 10.1088/0031-8949/1998/T74/011 PG 5 WC Physics, Multidisciplinary SC Physics GA YU112 UT WOS:000071683000013 ER PT J AU Brandt, S Lund, N Pedersen, H Castro-Tirado, AJ Priedhorsky, WC AF Brandt, S Lund, N Pedersen, H Castro-Tirado, AJ Priedhorsky, WC TI Observations of GRB X-ray afterglows with SODART/SRG SO PHYSICA SCRIPTA LA English DT Article; Proceedings Paper CT Nordic Conference in Theoretical High Energy Astrophysics CY SEP 14-16, 1997 CL COPENHAGEN, DENMARK SP Danish Space Res Inst, Nord Inst Theoret Phys, Nord Acad Adv Study AB Despite recent progress with the detection of afterglows of Gamma Ray Bursts (GRBs), the nature of these events is unknown. However, important clues to understanding what the GRBs are, may very well be found by studying the X-ray afterglows. The combination on SRG of the MOXE all-sky monitor for detecting GRBs, and the powerful pointed SODART telescopes will be a unique tool for studying the long-term behavior of GRB afterglows. It is shown that SODART will be able to follow the temporal and spectral development of a GRB similar to the now famous GRB 970228 event for well over 20 days in order to provide constraints on theoretical models. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Danish Space Res Inst, Copenhagen, Denmark. Copenhagen Univ Observ, DK-1350 Copenhagen, Denmark. INTA, LAEFF, Madrid, Spain. RP Brandt, S (reprint author), Univ Calif Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. OI Priedhorsky, William/0000-0003-0295-9138; Castro-Tirado, A. J./0000-0003-2999-3563 NR 3 TC 0 Z9 0 U1 0 U2 0 PU ROYAL SWEDISH ACAD SCIENCES PI STOCKHOLM PA PUBL DEPT BOX 50005, S-104 05 STOCKHOLM, SWEDEN SN 0281-1847 J9 PHYS SCRIPTA JI Phys. Scr. PY 1998 VL T77 BP 93 EP 94 DI 10.1088/0031-8949/1998/T77/028 PG 2 WC Physics, Multidisciplinary SC Physics GA 150TA UT WOS:000077680300030 ER PT J AU Kwiat, PG AF Kwiat, PG TI Experimental and theoretical progress in interaction-free measurements SO PHYSICA SCRIPTA LA English DT Article; Proceedings Paper CT Nobel Symposium 104 on Modern Studies of Basic Quantum Concepts and Phenomena CY JUN 13-17, 1997 CL GIMO, SWEDEN ID QUANTUM-THEORY; PARADOX AB Using a hybrid of a simple interference technique and an application of the quantum Zeno effect, it is possible to optically determine the presence of an absorbing object with an arbitrarily low probability that a photon is actually absorbed. We have demonstrated the feasibility of systems in which up to 85% of the measurements could be "interaction-free". Also, we have started investigating the possibility of using these techniques to allow "interaction-free" imaging of objects; our prototype schemes have shown resolutions of less than 10 mu m. Finally, we present a curious phenomenon that occurs when the object in question is only partially transmitting, which should allow a seeming violation of Beer's law. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Kwiat, PG (reprint author), Univ Calif Los Alamos Natl Lab, P-23,MS-H803, Los Alamos, NM 87545 USA. NR 14 TC 20 Z9 20 U1 0 U2 2 PU ROYAL SWEDISH ACAD SCIENCES PI STOCKHOLM PA PUBL DEPT BOX 50005, S-104 05 STOCKHOLM, SWEDEN SN 0281-1847 J9 PHYS SCRIPTA JI Phys. Scr. PY 1998 VL T76 BP 115 EP 121 DI 10.1238/Physica.Topical.076a00115 PG 7 WC Physics, Multidisciplinary SC Physics GA 120HL UT WOS:000075950900017 ER PT J AU Zurek, WH AF Zurek, WH TI Decoherence, chaos, quantum-classical correspondence, and the algorithmic arrow of time SO PHYSICA SCRIPTA LA English DT Article; Proceedings Paper CT Nobel Symposium 104 on Modern Studies of Basic Quantum Concepts and Phenomena CY JUN 13-17, 1997 CL GIMO, SWEDEN ID ENVIRONMENT-INDUCED DECOHERENCE; BROWNIAN-MOTION; SOLAR-SYSTEM; WAVE PACKET; MECHANICS; STATES; EVOLUTION; COMPUTERS; HISTORIES AB The environment - external or internal degrees of freedom coupled to the system - can, in effect, monitor some of its observables. As a result, the eigenstates of these observables decohere and behave like classical states: Continuous destruction of superpositions leads to environment-induced superselection (einselection). Here I investigate it in the context of quantum chaos (i.e., quantum dynamics of systems which are classically chaotic). I show that the evolution of a chaotic macroscopic (but, ultimately, quantum) system is not just difficult to predict (requiring an accuracy exponentially increasing with time) but quickly ceases to be deterministic in principle as a result of the Heisenberg indeterminacy (which limits the resolution available in the initial conditions). This happens after a time t((h) over bar) which is only logarithmic in the Planck constant. A definitely macroscopic (if somewhat outrageous) example is afforded by various components of the solar system which are chaotic, with the Lyapunov timescales ranging from a bit more than a month (Hyperion) to millions of years (planetary system as a whole). On the timescale t((h) over bar) the initial minimum uncertainty wavepackets corresponding to celestial bodies would be smeared over distances of the order of radii of their orbits into "Schrodinger cat - like" states, and the concept of a trajectory would cease to apply. In reality, such paradoxical states are eliminated by decoherence which helps restore quantum-classical correspondence. The price for the recovery of classicality is the loss of predictability: In the classical limit (associated with effective decoherence, and not just with the smallness of (h) over bar) the rate of increase of the von Neumann entropy of the decohering system is independent of the strength of the coupling to the environment, and equal to the sum of the positive Lyapunov exponents. Algorithmic aspects of entropy production are briefly explored to illustrate the effect of decoherence from the point of view of the observer. We show that "decoherence strikes twice": introducing unpredictability into the system and extracting quantum coherence from the observers memory, where it enters as a price for the classicality of his records. C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Zurek, WH (reprint author), Los Alamos Natl Lab, T-6,Mail Stop B288, Los Alamos, NM 87545 USA. NR 61 TC 69 Z9 70 U1 0 U2 6 PU ROYAL SWEDISH ACAD SCIENCES PI STOCKHOLM PA PUBL DEPT BOX 50005, S-104 05 STOCKHOLM, SWEDEN SN 0281-1847 J9 PHYS SCRIPTA JI Phys. Scr. PY 1998 VL T76 BP 186 EP 198 DI 10.1238/Physica.Topical.076a00186 PG 13 WC Physics, Multidisciplinary SC Physics GA 120HL UT WOS:000075950900027 ER PT J AU Lapenta, G Brackbill, JU AF Lapenta, G Brackbill, JU TI Simulation of plasma shielding of dust particles in anisotropic plasmas SO PHYSICA SCRIPTA LA English DT Article; Proceedings Paper CT International Topical Conference on Plasma Physics - New Perspectives of Collective Effects CY NOV 10-14, 1997 CL TRIESTE, ITALY SP ASICTP, IUPAP AB We consider a dielectric dust particle immersed in a plasma with one species lions) drifting relative to the dust particle. The equilibrium potential around the dust particle is studied with a self consistent first principle kinetic model. The anisotropy of the trajectories of the plasma particles is considered and the nonuniformity of the dust charging is described in detail. The simulations show the presence of a dipole field around the dust particle, with a significant attractive region. The results of the simulation work are compared successfully with a simple theoretical estimate. C1 Politecn Torino, Dipartimento Energet, I-10129 Turin, Italy. Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. RP Lapenta, G (reprint author), Politecn Torino, Dipartimento Energet, C Duca degli Abruzzi 24, I-10129 Turin, Italy. EM lapenta@plito.it OI Lapenta, Giovanni/0000-0002-3123-4024 NR 7 TC 10 Z9 10 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0031-8949 J9 PHYS SCRIPTA JI Phys. Scr. PY 1998 VL T75 BP 264 EP 266 DI 10.1238/Physica.Topical.075a00264 PG 3 WC Physics, Multidisciplinary SC Physics GA 112AZ UT WOS:000075472700066 ER PT S AU Toth, WJ AF Toth, WJ GP IAEA IAEA TI Implementation of physical security systems technology necessitates changes to facility management and other support network elements in nuclear facilities of the former Soviet Union SO PHYSICAL PROTECTION OF NUCLEAR MATERIALS: EXPERIENCE IN REGULATION, IMPLEMENTATION AND OPERATIONS SE PROCEEDING SERIES OF THE INTERNATIONAL ATOMIC ENERGY AGENCY LA English DT Proceedings Paper CT Conference on Physical Protection of Nuclear Materials - Experience in Regulation, Implementation and Operations CY NOV 10-14, 1997 CL INT ATOM ENERGY AGENCY, VIENNA, AUSTRIA SP Int Atom Energy Agency HO INT ATOM ENERGY AGENCY AB Many nuclear facilities in the former Soviet Union (FSU) are protected by physical security systems which have become obsolete over time or were never adequate to protect against the threat of theft of nuclear material. A programme to improve nuclear material protection, control and accountability in the FSU is being funded by the United States of America and supported by scientists, engineers and technicians who are experts in high technology security systems. The technology introduced in the FSU nuclear facilities is on the leading edge of what has been developed by the world industry and represents a considerable increase in sophistication for the facilities being upgraded. Physical security technology is not simply the electrical systems that are installed to provide an indication of intrusion by or an assessment of a potential thief. Nor is physical security technology just the layout of these electrical systems in an integrated security network supported by software. Rather, physical security technology is a combination of an integrated hardware/software system, supported by written procedures and established work flow processes in a management support network that understands the reasons for the implementation of the technology and its effect on the total organization. In short, implementation of technology is as much an issue of facility management and culture as it is of electrical connections and software functionality The paper shows that an effective upgrades system is only possible when teams assigned to work with FSU facility personnel consider all elements of technology implementation, including hardware, software, intellectual processes, work flow processes, hardware and software support networks, management support networks and elements of culture. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Toth, WJ (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. NR 0 TC 0 Z9 0 U1 1 U2 1 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5, PO BOX 100, A-1400 VIENNA, AUSTRIA SN 0074-1884 BN 92-0-101398-1 J9 P S IAEA PY 1998 BP 229 EP 235 PG 7 WC Nuclear Science & Technology SC Nuclear Science & Technology GA BN11R UT WOS:000080758800028 ER PT S AU Williams, JD AF Williams, JD GP IAEA IAEA TI Physical protection system design and evaluation SO PHYSICAL PROTECTION OF NUCLEAR MATERIALS: EXPERIENCE IN REGULATION, IMPLEMENTATION AND OPERATIONS SE PROCEEDING SERIES OF THE INTERNATIONAL ATOMIC ENERGY AGENCY LA English DT Proceedings Paper CT Conference on Physical Protection of Nuclear Materials - Experience in Regulation, Implementation and Operations CY NOV 10-14, 1997 CL INT ATOM ENERGY AGENCY, VIENNA, AUSTRIA SP Int Atom Energy Agency HO INT ATOM ENERGY AGENCY AB The design of an effective physical protection system (PPS) includes the determination of the PPS objectives, the initial design of a PPS, the evaluation of the design and, probably, the redesign or refinement of the system. To develop the objectives, the designer must begin by gathering information about facility operation and conditions, such as a comprehensive description of the facility, the operating conditions and the physical protection requirements. The designer then needs to define the threat. This involves considering factors about potential adversaries: class of adversary, adversary's capabilities and range of adversary's tactics. Next, the designer should identify targets. Determination of whether or not the materials being protected are attractive targets is based mainly on the ease or difficulty of acquisition and the desirability of the material. The designer now knows the objectives of the PPS, namely "what to protect against whom". The next step is to design the system by determining how best to combine such elements as fences, vaults, sensors and assessment devices, entry control devices, communication devices, procedures and protective force personnel to meet the objectives of the system. Once a PPS is designed, it must be analysed and evaluated to ensure that it meets the PPS objectives. Evaluation must allow for features working together to ensure protection rather than regarding each feature separately. Because of the complexity of the protection systems, an evaluation usually requires modelling techniques. If any vulnerabilities are found, the initial system must be redesigned to correct the vulnerabilities and a re-evaluation conducted. After the system is installed, the threat and system parameters may change with time. If they do, the analysis must be performed periodically to ensure that the system objectives are still being met. C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Williams, JD (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5, PO BOX 100, A-1400 VIENNA, AUSTRIA SN 0074-1884 BN 92-0-101398-1 J9 P S IAEA PY 1998 BP 267 EP 273 PG 7 WC Nuclear Science & Technology SC Nuclear Science & Technology GA BN11R UT WOS:000080758800033 ER PT S AU Hibbs, R Hoo, MS AF Hibbs, R Hoo, MS GP IAEA IAEA TI Variations on achieving an effective physical protection system SO PHYSICAL PROTECTION OF NUCLEAR MATERIALS: EXPERIENCE IN REGULATION, IMPLEMENTATION AND OPERATIONS SE PROCEEDING SERIES OF THE INTERNATIONAL ATOMIC ENERGY AGENCY LA English DT Proceedings Paper CT Conference on Physical Protection of Nuclear Materials - Experience in Regulation, Implementation and Operations CY NOV 10-14, 1997 CL INT ATOM ENERGY AGENCY, VIENNA, AUSTRIA SP Int Atom Energy Agency HO INT ATOM ENERGY AGENCY AB Physical protection systems should be designed to counter the perceived threat. Regardless of the motivation and composition of adversaries, they can employ only a limited number of tactics, namely, deceit, stealth and/or force. To counter these tactics, physical protection systems employ detection, assessment and delay in several layers. The concept of layered or in-depth protection is incorporated in the IAEA information circular, The Physical Protection of Nuclear Material (INFCIRC/225/ReV.3), which states that Category III material should be stored within an area to which access is controlled, Category Il material within a protected area and Category I material in a strong room within an inner area. While the paper provides general guidelines for the design of physical protection systems, it does not address analysis of cost and operational effectiveness. When designing a physical protection system, planners should analyse what level of detection, assessment and delay is best incorporated into each protective layer to achieve the most cost effective and operationally effective integrated system. The paper reviews the tactics of adversaries; considers the effectiveness of detection, assessment, delay and response as a function of the various layers of an in-depth system; and suggests a comparison of the relative cost and operational effectiveness of different combinations of detection, assessment and/or delay in the various layers. C1 US DOE, Jupiter Corp, Washington, DC 20545 USA. RP Hibbs, R (reprint author), US DOE, Jupiter Corp, Washington, DC 20545 USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5, PO BOX 100, A-1400 VIENNA, AUSTRIA SN 0074-1884 BN 92-0-101398-1 J9 P S IAEA PY 1998 BP 275 EP 281 PG 7 WC Nuclear Science & Technology SC Nuclear Science & Technology GA BN11R UT WOS:000080758800034 ER PT S AU Steele, RB Goodey, KO Holter, GM Schlegel, SC Skinner, TG AF Steele, RB Goodey, KO Holter, GM Schlegel, SC Skinner, TG GP IAEA IAEA TI Assessment and evaluation of complex material protection, control and accountability systems in the former Soviet Union SO PHYSICAL PROTECTION OF NUCLEAR MATERIALS: EXPERIENCE IN REGULATION, IMPLEMENTATION AND OPERATIONS SE PROCEEDING SERIES OF THE INTERNATIONAL ATOMIC ENERGY AGENCY LA English DT Proceedings Paper CT Conference on Physical Protection of Nuclear Materials - Experience in Regulation, Implementation and Operations CY NOV 10-14, 1997 CL INT ATOM ENERGY AGENCY, VIENNA, AUSTRIA SP Int Atom Energy Agency HO INT ATOM ENERGY AGENCY AB A need exists for a repeatable, well established process for evaluating all aspects of the current and planned material protection, control and accountability (MPC&A) systems implemented in the former Soviet Union (FSU) to protect weapons grade nuclear materials. The process must identify key elements of the MPC&A systems, determine their interrelationships and evaluate the contribution of each individual element to the overall programme. The overall system effectiveness is determined by how well each element performs its function and reports back to a centralized point. Evaluating the protective strategy for a facility using a systems analysis approach ensures that all elements that may impact or influence the strategy are considered. This approach can also assist in defining functions and requirements, establishing the baseline definition for the MPC&A system and providing interface and configuration management for the system. Once a baseline has been established, 'what if' or proposed modifications to selected elements, which may comprise the safeguards and security system, can be evaluated to determine the effects on system performance and reliability. Systems analysis provides a tool that can be used by the FSU to evaluate the total range of MPC&A programmes. It enables integration and analysis of a wide range of MPC&A information. C1 Battelle Mem Inst, Pacific NW Labs, Richland, WA 99352 USA. RP Steele, RB (reprint author), Battelle Mem Inst, Pacific NW Labs, POB 999, Richland, WA 99352 USA. NR 4 TC 0 Z9 0 U1 0 U2 0 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5, PO BOX 100, A-1400 VIENNA, AUSTRIA SN 0074-1884 BN 92-0-101398-1 J9 P S IAEA PY 1998 BP 311 EP 317 PG 7 WC Nuclear Science & Technology SC Nuclear Science & Technology GA BN11R UT WOS:000080758800039 ER PT S AU Fuller, GM AF Fuller, GM GP IAEA IAEA TI Electronic methods to detect persons hidden within cargo containers SO PHYSICAL PROTECTION OF NUCLEAR MATERIALS: EXPERIENCE IN REGULATION, IMPLEMENTATION AND OPERATIONS SE PROCEEDING SERIES OF THE INTERNATIONAL ATOMIC ENERGY AGENCY LA English DT Proceedings Paper CT Conference on Physical Protection of Nuclear Materials - Experience in Regulation, Implementation and Operations CY NOV 10-14, 1997 CL INT ATOM ENERGY AGENCY, VIENNA, AUSTRIA SP Int Atom Energy Agency HO INT ATOM ENERGY AGENCY AB Physical security technologies have been unable to address most 'Trojan Horse' scenarios at vehicle portals which provide access through the perimeter of a secure area. Thorough visual searches of vehicle cargo containers are time consuming, involve a number of security personnel and are cursory at best. Vehicles entering or exiting a protected site provide an adversary with an easy pathway across secure boundaries. A method to detect the presence of persons hiding within a vehicle's enclosed cargo container has been developed by Lockheed Martin Energy Systems. The system measures vibrations coupled to the container and generated by the human heart. Each time the human heart beats, it generates a small but measurable shock wave. This shock wave is propagated through the body and transmitted to anything with which the body has contact. This wave is referred to as a ballistocardiogram and is the mechanical equivalent to an electrocardiogram. Systems have been installed in several State prisons and have been independently tested and evaluated. The effectiveness of the system has been determined by the Thunder Mountain Evaluation Center at Fort Huachuca, Arizona. Sympathetic vibrations of the cargo container's surface can be collected using any of several detection methods, i.e. infrared, Doppler microwave, Doppler ultrasonic wave and geophones. The analog signal delivered by the sensors is passed through an amplifier and a low pass filter and then fed to a microprocessor via an analog to digital converter. When initiated by the operator, analog signals are recorded for a specific interval of time and rate. At the end of the recording interval, the data are analysed using wavelet transform techniques and compared with a ballistocardiographic template. If the collected data are similar, the system informs the operator that there is a high degree of probability that a person is within the vehicle. The paper describes in depth the development of the system, system operation, and system software and hardware, and discusses the algorithm, current development activities, testing, and actual usage of the system for the protection of nuclear facilities and State prisons. It focuses on technologies being evaluated for future iterations of the system and applications other than the protection of perimeters. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Fuller, GM (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. NR 3 TC 0 Z9 0 U1 1 U2 1 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5, PO BOX 100, A-1400 VIENNA, AUSTRIA SN 0074-1884 BN 92-0-101398-1 J9 P S IAEA PY 1998 BP 357 EP 363 PG 7 WC Nuclear Science & Technology SC Nuclear Science & Technology GA BN11R UT WOS:000080758800045 ER PT S AU Schuller, CR Ford, JL AF Schuller, CR Ford, JL GP IAEA IAEA TI Demand side analysis of theft of nuclear materials - Some insights from the study of complex crime SO PHYSICAL PROTECTION OF NUCLEAR MATERIALS: EXPERIENCE IN REGULATION, IMPLEMENTATION AND OPERATIONS SE PROCEEDING SERIES OF THE INTERNATIONAL ATOMIC ENERGY AGENCY LA English DT Proceedings Paper CT Conference on Physical Protection of Nuclear Materials - Experience in Regulation, Implementation and Operations CY NOV 10-14, 1997 CL INT ATOM ENERGY AGENCY, VIENNA, AUSTRIA SP Int Atom Energy Agency HO INT ATOM ENERGY AGENCY AB Some new insights into ways to augment existing physical security and safeguards procedures for nuclear materials can be gained by examining lessons learned from the study of complex criminal activities. This is intended to augment existing safeguards and security procedures by aiding in planning and integration of off-site activities. The approach described in the paper has been in use in law enforcement investigations of sophisticated property crimes for over twenty years. The approach involves developing a process model based on formal systems analysis methods. The model depicts all activities that perpetrators would have to carry out, from initial specification of desired materials and targets through escape and covering up of the operation. The basic model covers eight generic task steps: specification of the need, identification of the potential sources, establishment of contacts at the site, establishment of the means to execute an 'acquisition', execution of the acquisition, management of the collaborators, escape and transportation of items to their destination. Analysis of complex criminal activities indicates that in order to succeed, five basic requirements will have to be met: establishment of an organization to execute the crime; detailed planning and logistical support; covering up the existence of a crime before, during and after execution; focusing on the 'weakest link' in a system; and ensuring that everything appears 'normal' at all times. The paper presents two examples of the detailed tasks that would face a perpetrator at a hypothetical site. One conclusion which can be drawn is that the degree of complexity required for a successful theft and cover-up is formidable. By understanding what the perpetrators will have to do to succeed, security personnel can make the undertaking even more risky and difficult for tham. C1 Pacific NW Natl Lab, Seattle, WA USA. RP Schuller, CR (reprint author), Pacific NW Natl Lab, Seattle, WA USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5, PO BOX 100, A-1400 VIENNA, AUSTRIA SN 0074-1884 BN 92-0-101398-1 J9 P S IAEA PY 1998 BP 385 EP 393 PG 9 WC Nuclear Science & Technology SC Nuclear Science & Technology GA BN11R UT WOS:000080758800048 ER PT S AU Gardner, BH AF Gardner, BH GP IAEA IAEA TI The modern spectrum of nuclear terrorism SO PHYSICAL PROTECTION OF NUCLEAR MATERIALS: EXPERIENCE IN REGULATION, IMPLEMENTATION AND OPERATIONS SE PROCEEDING SERIES OF THE INTERNATIONAL ATOMIC ENERGY AGENCY LA English DT Proceedings Paper CT Conference on Physical Protection of Nuclear Materials - Experience in Regulation, Implementation and Operations CY NOV 10-14, 1997 CL INT ATOM ENERGY AGENCY, VIENNA, AUSTRIA SP Int Atom Energy Agency HO INT ATOM ENERGY AGENCY AB The modem spectrum of nuclear terrorism includes the types of nuclear terrorism that are actually observed in the world today and the types of terrorism that are postulated or anticipated on the basis of highly publicized and disseminated information sources. The ease of obtaining information on nuclear weapon design and nuclear material is pointed out in order to raise the awareness that nuclear terrorism is possible. The information and the material required to produce a sophisticated nuclear weapon are usually very well protected, but some of the less attractive material is often not as well protected. The world community can protect itself against nuclear terrorism by significantly increasing the physical protection of all types of material that can be potentially used by terrorists. C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Gardner, BH (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5, PO BOX 100, A-1400 VIENNA, AUSTRIA SN 0074-1884 BN 92-0-101398-1 J9 P S IAEA PY 1998 BP 395 EP 398 PG 4 WC Nuclear Science & Technology SC Nuclear Science & Technology GA BN11R UT WOS:000080758800049 ER PT J AU Gottesman, D AF Gottesman, D TI Theory of fault-tolerant quantum computation SO PHYSICAL REVIEW A LA English DT Article ID ERROR-CORRECTING CODES AB In order to use quantum error-correcting codes to improve the performance of a quantum computer, it is necessary to be able to perform operations fault-tolerantly on encoded states. I present a theory of fault-tolerant operations on stabilizer codes based on symmetries of the code stabilizer. This allows a straightforward determination of which operations can be performed fault-tolerantly on a given code. I demonstrate that fault-tolerant universal computation is possible for any stabilizer code. I discuss a number of examples in more detail, including the five-quantum-bit code. [S1050-2947(98)06501-9]. C1 CALTECH, Pasadena, CA 91125 USA. Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Gottesman, D (reprint author), CALTECH, Pasadena, CA 91125 USA. EM gottesma@t6-serv.lanl.gov NR 19 TC 276 Z9 280 U1 1 U2 9 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 EI 1094-1622 J9 PHYS REV A JI Phys. Rev. A PD JAN PY 1998 VL 57 IS 1 BP 127 EP 137 DI 10.1103/PhysRevA.57.127 PG 11 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA YP837 UT WOS:000071320500021 ER PT J AU Bozek, J Carroll, TX Hahne, J Saethre, LJ True, J Thomas, TD AF Bozek, J Carroll, TX Hahne, J Saethre, LJ True, J Thomas, TD TI High-resolution carbon 1s photoelectron spectrum of ethene: Ab initio calculation of vibrational structure with dynamic localization of the core hole SO PHYSICAL REVIEW A LA English DT Article ID SYMMETRY-BREAKING; ELECTRON-IMPACT; FREQUENCIES; METHANE; STATES; PHOTOEMISSION; IONIZATION; EXCITATION; THRESHOLD; ENERGIES AB The vibrational structure in the carbon 1s photoelectron spectrum of ethene has been measured with a total experimental resolution of about 55 meV, significantly better than has been previously reported. The spectrum has been calculated using ab initio electronic structure theory with a localized core hole and the equivalent-cores approximation. Agreement between the calculated spectrum and measurements (taken 29 eV above the carbon 1s threshold) is excellent. This agreement indicates that there is dynamic localization of the core hale, even though the 1 sigma(g)-1 sigma(u) splitting is not small. The theoretical method provides an approach that is useful for analyzing such spectra and also shows some of the pitfalls of attempting to fit complex vibrational spectra without guidance from theory. [S1050-2947(98)00101-2]. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Adv Light Source, Berkeley, CA 94720 USA. Keuka Coll, Keuka Pk, NY 14478 USA. Oregon State Univ, Dept Chem, Corvallis, OR 97331 USA. Univ Bergen, Dept Chem, N-5007 Bergen, Norway. RP Bozek, J (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Adv Light Source, Berkeley, CA 94720 USA. RI Bozek, John/E-4689-2010; Bozek, John/E-9260-2010 OI Bozek, John/0000-0001-7486-7238 NR 31 TC 40 Z9 40 U1 2 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD JAN PY 1998 VL 57 IS 1 BP 157 EP 161 DI 10.1103/PhysRevA.57.157 PG 5 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA YP837 UT WOS:000071320500024 ER PT J AU Bannister, ME Chung, YS Djuric, N Wallbank, B Woitke, O Zhou, S Dunn, GH Smith, ACH AF Bannister, ME Chung, YS Djuric, N Wallbank, B Woitke, O Zhou, S Dunn, GH Smith, ACH TI Absolute cross sections for near-threshold electron-impact excitation of the 2s (2)S -> 2p (2)P transition in C(3+) SO PHYSICAL REVIEW A LA English DT Article ID DIELECTRONIC RECOMBINATION; 2S-2P EXCITATION; EXTERNAL-FIELD; BEAMS; IONS AB Absolute total cross sections for electron-impact excitation of the 2s (2)S-->2p (2)P transition in C(3+) were measured from 7.35 eV to 8.35 eV using the merged electron-ion-beams energy-loss technique. The results settle the discrepancy between two previous experiments using the crossed-beams fluorescence method, being in very good agreement with the older results [P. O. Taylor, D. Gregory, G. H. Dunn, R. A. Phaneuf, and D. H. Crandall, Phys. Rev. Lett. 39, 1256 (1977)] but less so with the more recent ones [D. W. Savin, L, D. Gardner, D. B. Reisenfeld, A. R. Young, and J. L. Kohl, Phys. Rev. A 51, 2162 (1995)]. The present measurements are also in good agreement with unitarized Coulomb-Born and close-coupling calculations. [S1050-2947(98)04301-7]. C1 Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA. Univ Colorado, Joint Inst Lab Astrophys, Boulder, CO 80309 USA. Natl Inst Stand & Technol, Boulder, CO 80309 USA. UCL, London WC1E 6BT, England. Chungnam Natl Univ, Dept Phys, Taejon 305764, South Korea. St Francis Xavier Univ, Dept Phys, Antigonish, NS B2G 2W5, Canada. RP Bannister, ME (reprint author), Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA. OI Bannister, Mark E./0000-0002-9572-8154 NR 18 TC 17 Z9 17 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD JAN PY 1998 VL 57 IS 1 BP 278 EP 281 DI 10.1103/PhysRevA.57.278 PG 4 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA YP837 UT WOS:000071320500038 ER PT J AU Maslov, S Zheludev, A AF Maslov, S Zheludev, A TI Coexistence of Haldane-gap excitations and long-range antiferromagnetic order in mixed-spin nickelates R2BaNiO5 SO PHYSICAL REVIEW B LA English DT Article ID DIMENSIONAL HEISENBERG-ANTIFERROMAGNET; SOFT-MODE TRANSITION; NEUTRON-SCATTERING; MAGNETIC EXCITATIONS; S=1 ANTIFERROMAGNET; CHAIN; DYNAMICS; Y2BANIO5; CSNICL3; ND2BANIO5 AB The spin dynamics of the S=1 Ni chains in mixed-spin antiferromagnets Pr2BaNiO5 and NdxY2-xBaNiO5 is described in terms of a simple Ginzburg-Landau Lagrangian coupled to the sublattice of rare-earth ions. Within this framework we obtain a theoretical explanation for the experimentally observed coexistence of Haldane-gap excitations and long-range magnetic order, as well as for the increase of the Haldane-gap energy below the Neel point. We also predict that the degeneracy of the Haldane triplet is lifted in the magnetically ordered phase. The growth of both gaps are shown to follow from the magnon repulsion. The theoretical results are consistent with the available experimental data. C1 Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. RP Maslov, S (reprint author), Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. EM maslov@cmt3.phy.bnl.gov RI Maslov, Sergei/C-2397-2009 OI Maslov, Sergei/0000-0002-3701-492X NR 28 TC 37 Z9 38 U1 0 U2 6 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD JAN 1 PY 1998 VL 57 IS 1 BP 68 EP 71 DI 10.1103/PhysRevB.57.68 PG 4 WC Physics, Condensed Matter SC Physics GA YP839 UT WOS:000071320800018 ER PT J AU Potter, CD Swiatek, M Bader, SD Argyriou, DN Mitchell, JF Miller, DJ Hinks, DG Jorgensen, JD AF Potter, CD Swiatek, M Bader, SD Argyriou, DN Mitchell, JF Miller, DJ Hinks, DG Jorgensen, JD TI Two-dimensional intrinsic and extrinsic ferromagnetic behavior of layered La1.2Sr1.8Mn2O7 single crystals SO PHYSICAL REVIEW B LA English DT Article ID PHASE-DIAGRAM; MAGNETORESISTANCE; PEROVSKITE; TRANSITION; FILMS AB The low-field magnetization M and susceptibility chi are reported for the two-layered Ruddleson-Popper phase SrO(La1-xSrxMnO3)(2) for x=0.4 (denoted La1.2Sr1.8Mn2O7) with an in-plane magnetic easy axis. As T approaches the Curie temperature (T-C=116 K) on cooling, where the metal-insulator transition occurs in zero field, chi diverges as H-1/delta', with delta=21+/-5. Also, near an extrinsic Curie transition attributed to similar to 0.1% fraction of intergrowths at T*=2.47 T-C, M scales as (1-T/T)(beta), with beta=0.25+/-0.02. These results can be understood within the context of two-dimensional XY models, and provide some perspective of the layered manganites. C1 Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. Argonne Natl Lab, Sci & Technol Ctr Supercond, Argonne, IL 60439 USA. RP Potter, CD (reprint author), Seagate Technol, Bloomington, MN 55435 USA. RI Bader, Samuel/A-2995-2013 NR 17 TC 70 Z9 70 U1 1 U2 13 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD JAN 1 PY 1998 VL 57 IS 1 BP 72 EP 75 DI 10.1103/PhysRevB.57.72 PG 4 WC Physics, Condensed Matter SC Physics GA YP839 UT WOS:000071320800019 ER PT J AU Freeland, JW Grigorov, IL Walker, JC AF Freeland, JW Grigorov, IL Walker, JC TI Magnetic phase transition in epitaxial Ni1-xFex alloy thin films SO PHYSICAL REVIEW B LA English DT Article ID FE FILMS; FCC IRON; CU(100); ANTIFERROMAGNETISM; FERROMAGNETISM; CU(001) AB An investigation of fee Ni1-xFex thin films utilizing a combination of Mossbauer spectroscopy and magnetometry twenty presents clear evidence for the emergence of a low-spin antiferromagnetic state in the region of high Fe concentration, which coexists with a high-spin ferromagnetic state. The emergence of this state is observed by magnetometry as a drop in the saturation moment while Mossbauer spectroscopy reveals the appearance of a low-spin antiferromagnetic state. Evidence of superparamagnetic behavior indicates that the portion of the sample in the high-spin state may exist as clusters in a matrix of the low-spin state. C1 Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA. RP Freeland, JW (reprint author), USN, Brookhaven Natl Lab, Res Lab, NSLS Bldg,725A-U4B, Upton, NY 11973 USA. NR 30 TC 37 Z9 37 U1 0 U2 3 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD JAN 1 PY 1998 VL 57 IS 1 BP 80 EP 83 DI 10.1103/PhysRevB.57.80 PG 4 WC Physics, Condensed Matter SC Physics GA YP839 UT WOS:000071320800021 ER PT J AU Sacchi, M Hague, CF Gullikson, EM Underwood, JH AF Sacchi, M Hague, CF Gullikson, EM Underwood, JH TI Resonant magnetic scattering of polarized soft x rays: Specular reflectivity and Bragg diffraction from multilayers SO PHYSICAL REVIEW B LA English DT Article ID EXCHANGE SCATTERING; HOLMIUM; EDGES AB We have measured resonant magnetic scattering of elliptically polarized soft x rays from magnetically ordered Fe/Co multilayers, tuning the photon energy across the 2p edges of Fe and Co. Specular reflectivity was measured for a series of angles of incidence as a function of the photon energy. Bragg diffraction was measured performing theta/2 theta scans for several photon energies. In both cases, large magnetic signals were observed, up to 20% peak to peak in the asymmetry ratio. An estimate of the variation of the real part of the refractive index through the Fe L-3 edge is derived from the Bragg peak displacement versus energy. C1 Ctr Univ Paris Sud, Utilisat Rayonnement Electromagnet Lab, F-91405 Orsay, France. Ist Nazl Fis Mat, I-41100 Modena, Italy. Univ Paris 06, Chim Phys Mat & Rayonnement Lab, F-75231 Paris 05, France. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Ctr Xray Opt, Berkeley, CA 94720 USA. RP Sacchi, M (reprint author), Ctr Univ Paris Sud, Utilisat Rayonnement Electromagnet Lab, F-91405 Orsay, France. NR 20 TC 22 Z9 22 U1 1 U2 1 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD JAN 1 PY 1998 VL 57 IS 1 BP 108 EP 111 DI 10.1103/PhysRevB.57.108 PG 4 WC Physics, Condensed Matter SC Physics GA YP839 UT WOS:000071320800028 ER PT J AU Kirchner, A Busch, K Soukoulis, CM AF Kirchner, A Busch, K Soukoulis, CM TI Transport properties of random arrays of dielectric cylinders SO PHYSICAL REVIEW B LA English DT Article ID STRONGLY SCATTERING MEDIA; NEMATIC LIQUID-CRYSTALS; CLASSICAL WAVES; WEAK LOCALIZATION; LIGHT DIFFUSION; COHERENT BACKSCATTERING; 2-COMPONENT COMPOSITE; DISORDERED-SYSTEMS; CONSTANT; PROPAGATION AB We apply a recently developed approach for calculating the transport properties of random media to the case of disordered arrays of parallel oriented and normally illuminated cylinders. Within this effective-medium theory resonant scattering of the individual scatterer is treated exactly, and by using a coated cylinder as the basic scattering unit, multiple scattering contributions are incorporated in a mean-field sense. In the long-wavelength limit we are able to calculate the effective dielectric constant analytically. We compare our findings with results for periodic systems. For both "scalar" and "vector" polarization, we reliably calculate the mean-free path, the transport velocity, and the diffusion coefficient for finite frequencies for all densities of scatterers and dielectric contrasts. Furthermore, within this effective-medium approach, we present our results for the localization parameter (k) over bar l(t), for both two- and three-dimensional systems, thereby identifying the optimal parameters for observing localization. C1 Univ Karlsruhe, Inst Theorie Kondensierten Materie, D-76128 Karlsruhe, Germany. Iowa State Univ, Ames Lab, Ames, IA 50011 USA. Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA. RP Univ Karlsruhe, Inst Theorie Kondensierten Materie, Kaiserstr 12, D-76128 Karlsruhe, Germany. RI Soukoulis, Costas/A-5295-2008 NR 58 TC 67 Z9 69 U1 0 U2 6 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9950 EI 2469-9969 J9 PHYS REV B JI Phys. Rev. B PD JAN 1 PY 1998 VL 57 IS 1 BP 277 EP 288 DI 10.1103/PhysRevB.57.277 PG 12 WC Physics, Condensed Matter SC Physics GA YP839 UT WOS:000071320800055 ER PT J AU Vaknin, D Koster, JP Zarestky, JL Wang, ZR Fernandez-Baca, JA Johnston, DC AF Vaknin, D Koster, JP Zarestky, JL Wang, ZR Fernandez-Baca, JA Johnston, DC TI Magnetic neutron diffraction from the magnetic clusters in single crystal BaCuO2+x SO PHYSICAL REVIEW B LA English DT Article AB Magnetic-neutron-diffraction studies of a single crystal of BaCuO2+x confirm the antiferromagnetic structure of the ringlike Cu-6 clusters with ground-state spin S=3 proposed by Wang et al. [Science 264, 402 (1994)]. No indication of a spontaneous ferromagnetic (or simple antiferromagnetic) ordering of the spherelike Cu-18 S = 9 clusters were observed down to a temperature of 50 mK, in disagreement with the suggestion based on magnetic-susceptibility measurements performed down to 2 K. However, diffraction scans under applied magnetic fields up to 3 T, at temperatures of 0.05 and 4.2 K align the sphere clusters ferromagnetically. The magnetic-field-induced ferromagnetic-diffraction pattern is consistent with the form factor of the Cu-18 spherelike cluster. Frustration in the coupling with nearest neighbors leads to a paramagnetic behavior or a complex magnetic structure (noncollinear and/or incommensurate) of the spherelike clusters, consistent with our findings. C1 Iowa State Univ, Ames Lab, Ames, IA 50011 USA. Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA. Univ Florida, Dept Phys, Gainesville, FL 32611 USA. Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Vaknin, D (reprint author), Iowa State Univ, Ames Lab, Ames, IA 50011 USA. RI Fernandez-Baca, Jaime/C-3984-2014; Vaknin, David/B-3302-2009 OI Fernandez-Baca, Jaime/0000-0001-9080-5096; Vaknin, David/0000-0002-0899-9248 NR 16 TC 3 Z9 3 U1 1 U2 3 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD JAN 1 PY 1998 VL 57 IS 1 BP 465 EP 470 DI 10.1103/PhysRevB.57.465 PG 6 WC Physics, Condensed Matter SC Physics GA YP839 UT WOS:000071320800075 ER PT J AU Rakhmanova, S Mills, DL Fullerton, EE AF Rakhmanova, S Mills, DL Fullerton, EE TI Low-frequency dynamic response and hysteresis in magnetic superlattices SO PHYSICAL REVIEW B LA English DT Article ID SPIN-FLOP TRANSITION; FE/CR(211) AB We study theoretically the low-frequency dynamic response of magnetic superlattices. We have the Fe/Cr(211) structure in mind, which has been demonstrated to have a surface or bulk spin-flop phase, depending on the number of magnetic layers. We proceed by integrating the equations of motion of the coupled magnetic films in time, for an extended period. We include Landau-Lifshitz damping in the equations of motion, and drive the structure with an appropriate low-frequency held. The externally applied (nominal) de magnetic field is increased slowly. We can follow the structure through the sequence of magnetic-field-induced phase transitions. By this means, we obtain the magnetic phase diagram, chi(1) and chi(2), along with hysteresis curves in a single calculation. We also provide data on the magnetic-field dependence of the low-field susceptibility, which is in good accord with theory. C1 Univ Calif Irvine, Dept Phys & Astron, Irvine, CA 92697 USA. Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. RP Rakhmanova, S (reprint author), Univ Calif Irvine, Dept Phys & Astron, Irvine, CA 92697 USA. RI Fullerton, Eric/H-8445-2013 OI Fullerton, Eric/0000-0002-4725-9509 NR 10 TC 27 Z9 27 U1 0 U2 3 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD JAN 1 PY 1998 VL 57 IS 1 BP 476 EP 484 DI 10.1103/PhysRevB.57.476 PG 9 WC Physics, Condensed Matter SC Physics GA YP839 UT WOS:000071320800077 ER PT J AU Lascialfari, A Gatteschi, D Borsa, F Shastri, A Jang, ZH Carretta, P AF Lascialfari, A Gatteschi, D Borsa, F Shastri, A Jang, ZH Carretta, P TI Proton NMR and mu SR in Mn12O12 acetate: A mesoscopic magnetic molecular cluster SO PHYSICAL REVIEW B LA English DT Article ID TEMPERATURE SPIN DYNAMICS; RELAXATION AB The spin dynamics of Mn spins in the dodecanuclear manganese cluster of formula [Mn12O12(CH3COO)(16)(H2O)(4)]. 2CH(3)-COOH-4H(2)O(Mn-12) has been investigated by H-1 NMR and muon spin-lattice relaxation rate 1/T-1 as a function of temperature (10-400 K) and external magnetic field (0-9.4 T). At room temperature, the proton 1/T-1 depends on the measuring frequency. The results can be interpreted in terms of a slow decay of the Mn electronic-spin autocorrelation function, a feature characteristic of the almost zero dimensionality of the system. As the temperature is lowered, 1/T-1 displays a critical enhancement that can be related to the slowing down of the local spin fluctuations as the cluster approaches the condensation into thr total spin S = 10 ground-state configuration. It is found that the application of an external magnetic field greatly depresses the enhancement of 1/T-1 an effect that could be related to the superparamagnetic behavior of the Mn-12 molecule. C1 Univ Florence, Dept Chem, I-50121 Florence, Italy. Iowa State Univ Sci & Technol, Ames Lab, Ames, IA 50011 USA. Iowa State Univ Sci & Technol, Dept Phys & Astron, Ames, IA 50011 USA. Unita INFN Pavia, Dept Phys A Volta, I-27100 Pavia, Italy. Unita INFM Pavia, Dept Phys A Volta, I-27100 Pavia, Italy. RP Lascialfari, A (reprint author), Univ Florence, Dept Chem, I-50121 Florence, Italy. RI Gatteschi, Dante/B-5429-2008; OI Gatteschi, Dante/0000-0002-4859-4317 NR 21 TC 54 Z9 54 U1 0 U2 1 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD JAN 1 PY 1998 VL 57 IS 1 BP 514 EP 520 DI 10.1103/PhysRevB.57.514 PG 7 WC Physics, Condensed Matter SC Physics GA YP839 UT WOS:000071320800082 ER PT J AU Eldridge, JE Lin, Y Wang, HH Williams, JM Kini, AM AF Eldridge, JE Lin, Y Wang, HH Williams, JM Kini, AM TI T-c-dependent Raman scattering from a high-frequency phonon in kappa-(BEDT-TTF)(2)Cu[N(CN)(2)]Br SO PHYSICAL REVIEW B LA English DT Article ID ORGANIC SUPERCONDUCTOR; SINGLE-CRYSTALS; BEDT-TTF; TEMPERATURE; (BEDT-TTF)2I3; VIBRATIONS; MODES; GAP AB We report the temperature dependence of the frequencies of two high-frequency intramolecular modes in kappa-(BEDT-TTF)(2)Cu[N(CN)(2)]Br measured by resonant Raman scattering; with the use of a Fourier-transform spectrometer equipped with an infrared laser. One of these modes, that at 892 cm(-1) and assigned to nu(60)(B-3g) exhibits an increase below T-c of 2.2+/-0.7 cm(-1) and 2.2+/-0.4 cm(-1) when measured in a Janis Dewar and in a Heli-Tran refrigerator, respectively. A smaller increase is observed in the deuterated sample and no increase is observed at all if the samples are cooled too rapidly. Two other modes, nu(3)(A(g)) at 1474 cm(-1) and nu(9)(A(g)) at 503 cm(-1), show no such increase below T-c in the slowly cooled samples. We speculate that the normal electron-phonon interaction may not be responsible for the frequency increase but that the superconducting transition may involve a change in either the geometry or the arrangement of the BEDT-TTF molecules to which the particular mode is sensitive. C1 Univ British Columbia, Dept Phys, Vancouver, BC V6T 1Z1, Canada. Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA. RP Eldridge, JE (reprint author), Univ British Columbia, Dept Phys, 6224 Agr Rd, Vancouver, BC V6T 1Z1, Canada. RI Kini, Aravinda/F-4467-2012 NR 26 TC 21 Z9 21 U1 2 U2 2 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD JAN 1 PY 1998 VL 57 IS 1 BP 597 EP 601 DI 10.1103/PhysRevB.57.597 PG 5 WC Physics, Condensed Matter SC Physics GA YP839 UT WOS:000071320800092 ER PT J AU del Castillo, JRF Noheda, B Cereceda, N Gonzalo, JA Iglesias, T Przeslawski, J AF del Castillo, JRF Noheda, B Cereceda, N Gonzalo, JA Iglesias, T Przeslawski, J TI Scaling and metastable behavior in uniaxial ferroelectrics SO PHYSICAL REVIEW B LA English DT Article ID TRIGLYCINE SELENATE; EQUATION; STATE AB Improved experimental resolution and computer aided data analysis of hysteresis loops at T approximate to T-C in uniaxial ferroelectrics triglycene sulfate (ordinary critical point), and triglycine selenate (quasitricritical point) show that scaling holds in a wide range of scaled fields spanning many orders of magnitude, well beyond the asymptotic region (\T-T-C\-->0), and that the behavior of metastable experimental points (E<0,P>0) approaches the theoretical branch of the respective scaling equation as T --> T-C. [S0163-1829(98)05102-9]. C1 Autonomous Univ Madrid, Dept Mat Phys, E-28049 Madrid, Spain. Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. Univ Wroclaw, Inst Expt Phys, PL-50205 Wroclaw, Poland. RP del Castillo, JRF (reprint author), Autonomous Univ Madrid, Dept Mat Phys, E-28049 Madrid, Spain. OI Fernandez del Castillo Diez, Jose Raul/0000-0003-4335-2586 NR 11 TC 7 Z9 7 U1 0 U2 2 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD JAN 1 PY 1998 VL 57 IS 2 BP 805 EP 810 PG 6 WC Physics, Condensed Matter SC Physics GA YR357 UT WOS:000071487300029 ER PT J AU Ravelo, R Aguilar, J Baskes, M Angelo, JE Fultz, B Holian, BL AF Ravelo, R Aguilar, J Baskes, M Angelo, JE Fultz, B Holian, BL TI Free energy and vibrational entropy difference between ordered and disordered Ni3Al SO PHYSICAL REVIEW B LA English DT Article ID EMBEDDED-ATOM METHOD; COMPUTER-SIMULATION; LATTICE-DYNAMICS; DEFECTS; ALLOYS; TRANSFORMATION; BOUNDARIES; TRANSITION; SURFACES; NI AB We have calculated free energy and vibrational entropy differences in Ni3Al between its equilibrium ordered structure and a disordered fee solid solution, The free energy and entropy differences were calculated using the method of adiabatic switching in a molecular-dynamics formalism. The path chosen for the free-energy calculations directly connects the disordered with the ordered state. The atomic interactions are described by embedded-atom-method potentials. We find that the vibrational entropy difference increases with temperature from 0.14k(B)/atom at 300 K to 0.22k(B)/atom at 1200 K. We have calculated the density of states (DOS) of the disordered phase from the Fourier transform of the velocity-velocity autocorrelation function, The disordered DOS looks more like a broadened version of the ordered DOS. Analysis of the partial density of states shows that the Al atoms vibrations are most affected by the compositional disorder, The phonon partial spectral intensities along the [100] direction show that the vibrational spectrum of the disordered phase contains intensities at optical mode frequencies of the ordered alloy. We find that the volume difference between the ordered and disordered phases plays the most crucial role in the magnitude of the vibrational entropy difference. If the lattice constant of the two phases is set to the same value, the vibrational entropy difference decreases to zero. [S0163-1829(98)06202-X]. C1 Univ Texas, Dept Phys, El Paso, TX 79968 USA. Univ Texas, Mat Res Inst, El Paso, TX 79968 USA. Sandia Natl Labs, Mat Reliabil Dept, Livermore, CA 94551 USA. CALTECH, Div Engn & Appl Sci, Pasadena, CA 91125 USA. Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. RP Ravelo, R (reprint author), Univ Texas, Dept Phys, El Paso, TX 79968 USA. NR 43 TC 47 Z9 47 U1 0 U2 11 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD JAN 1 PY 1998 VL 57 IS 2 BP 862 EP 869 DI 10.1103/PhysRevB.57.862 PG 8 WC Physics, Condensed Matter SC Physics GA YR357 UT WOS:000071487300036 ER PT J AU Frase, H Fultz, B Robertson, JL AF Frase, H Fultz, B Robertson, JL TI Phonons in nanocrystalline Ni3Fe SO PHYSICAL REVIEW B LA English DT Article ID DENSITY-OF-STATES; INTRINSIC INSTABILITY; GRAIN-GROWTH; GLASSES; NANOSTRUCTURES; THERMODYNAMICS; SEGREGATION; METALS AB Inelastic neutron-scattering spectra were measured to obtain the phonon density of states (DOS) of nanocrystalline fee Ni3Fe. The materials were prepared by mechanical alloying, and were also subjected to heat treatments to alter their crystallite sizes and internal strains. In comparison to material with large crystallites, the nanocrystalline material shows two distinct differences in its phonon DOS. The nanocrystalline DOS was more than twice as large at energies below 15 meV. This increase was approximately proportional to the density of grain boundaries in the material. Second, features in the nanocrystalline DOS are broadened substantially. This broadening did not depend in a simple way on the crystallite size of the sample, suggesting that it has a different physical origin than the enhancement in phonon DOS at energies below 15 meV, A damped harmonic oscillator model for the phonons provides a quality factor Q(u), as low as 7 for phonons in the nanocrystalline material. The difference in vibrational entropy of the bulk and nanocrystalline Ni3Fe was small, owing to competing changes in the nanocrystalline phonon DOS at low and high energies. [S0163-1829(98)06402-9]. C1 CALTECH, Div Engn & Appl Sci, Pasadena, CA 91125 USA. Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP CALTECH, Div Engn & Appl Sci, Pasadena, CA 91125 USA. NR 38 TC 59 Z9 60 U1 1 U2 5 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9950 EI 2469-9969 J9 PHYS REV B JI Phys. Rev. B PD JAN 1 PY 1998 VL 57 IS 2 BP 898 EP 905 DI 10.1103/PhysRevB.57.898 PG 8 WC Physics, Condensed Matter SC Physics GA YR357 UT WOS:000071487300040 ER PT J AU Menchero, JG AF Menchero, JG TI One-electron theory of core-level photoemission from ferromagnets SO PHYSICAL REVIEW B LA English DT Article ID X-RAY PHOTOEMISSION; MAGNETIC-DICHROISM; RESOLVED PHOTOEMISSION; CIRCULAR-DICHROISM; SPIN POLARIZATION; FE; SPECTRA; NICKEL; LIGHT; NI AB A one-electron theory is presented for photoemission from a p core level of a ferromagnet. The approach permits the straightforward calculation of angle- and spin-resolved photoemission spectra for an arbitrary geometry and photon polarization. The Hamiltonian employed simultaneously includes both spin-orbit and exchange interactions, and thereby accounts for mixing between the p(3/2) and p(1/2) levels. Photoelectron diffraction effects are neglected. Using this model, good agreement is obtained with experimental spin-resolved and magnetodichroic Fe 2p photoemission spectra. [S0163-1829(98)09601-5]. C1 Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. RP Menchero, JG (reprint author), Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. NR 26 TC 34 Z9 34 U1 1 U2 2 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD JAN 1 PY 1998 VL 57 IS 2 BP 993 EP 1000 DI 10.1103/PhysRevB.57.993 PG 8 WC Physics, Condensed Matter SC Physics GA YR357 UT WOS:000071487300051 ER PT J AU Menchero, JG AF Menchero, JG TI Spin polarization and many-body effects in Ni 3p core-level photoemission SO PHYSICAL REVIEW B LA English DT Article ID FERROMAGNETIC NICKEL; FE; SPECTRUM; METAL AB Photoemission spectra are calculated for the Ni 3p core level within a small-cluster many-body scheme, and compared to experimental results. The effects of spin-orbit coupling, electron-electron interaction, and extra-atomic screening are understood by examining theoretical spectra for a variety of Limiting cases. The transfer of spectral weight between the satellites and the main lines is found to depend on the ratio of the valence bandwidth to the effective Hubbard interaction U-eff. Local final-state configurations an reported, and a physical interpretation of the various spectral peaks is given. [S0163-1829(98)07501-8]. C1 Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. RP Menchero, JG (reprint author), Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. NR 14 TC 12 Z9 12 U1 1 U2 1 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD JAN 1 PY 1998 VL 57 IS 2 BP 1001 EP 1006 DI 10.1103/PhysRevB.57.1001 PG 6 WC Physics, Condensed Matter SC Physics GA YR357 UT WOS:000071487300052 ER PT J AU Boni, P Sternlieb, BJ Shirane, G Roessli, B Lorenzo, JE Werner, SA AF Boni, P Sternlieb, BJ Shirane, G Roessli, B Lorenzo, JE Werner, SA TI Polarization dependence of the magnetic fluctuations in Cr below T-N SO PHYSICAL REVIEW B LA English DT Article ID CHROMIUM; EXCITATIONS; SCATTERING; DYNAMICS; ALLOYS AB We have investigated the magnetic excitations in single-Q, single-domain Cr below T-N using polarization analysis of inelastically scattered neutrons for energy transfers up to 18 meV. The results show that the longitudinal (L) magnetic modes are enhanced below similar or equal to 8 meV with respect to the transverse (T) modes at low temperature. The latter are independent of the polarization with respect to the ordering vector Q'(+/-) in the transverse spin-density-wave phase, i.e., they are isotropic. The L and T modes are not affected by the spin-hop transition to the longitudinal spin-density-wave phase at T-sf = 121 K indicating that the transition is due to anisotropies and that it is not an intrinsic feature of the spin-density wave. There are indications that the L modes have a less steep dispersion curve and are more damped than the T modes in accordance with the three-band model by Fishman and Liu. With increasing temperature the intensity from the T and L modes increases strongly at small E transfer and their E dependence becomes similar. In particular, the enhancement of the L modes with respect to the T modes vanishes. Significant inelastic scattering is present at the silent peak positions. It surpasses even the scattering at the allowed peak positions at large E transfers. We argue that the silent inelastic scattering is partly responsible for the "commensurate" scattering at the (100) position due to resolution effects and that the major cross section at (100) is due to the longitudinally polarized Fincher-Burke mode at 4.2 meV. C1 ETH, Neutron Scattering Lab, CH-5232 Villigen, Switzerland. Paul Scherrer Inst, CH-5232 Villigen, Switzerland. Brookhaven Natl Lab, Upton, NY 11973 USA. Inst Max Von Laue Paul Langevin, F-38042 Grenoble, France. CNRS, Crystallog Lab, F-38042 Grenoble, France. Univ Missouri, Dept Phys, Columbia, MO 65211 USA. RP Roessli, B (reprint author), ETH, Neutron Scattering Lab, CH-5232 Villigen, Switzerland. NR 22 TC 10 Z9 10 U1 1 U2 2 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD JAN 1 PY 1998 VL 57 IS 2 BP 1057 EP 1065 DI 10.1103/PhysRevB.57.1057 PG 9 WC Physics, Condensed Matter SC Physics GA YR357 UT WOS:000071487300060 ER PT J AU Wochner, P Tranquada, JM Buttrey, DJ Sachan, V AF Wochner, P Tranquada, JM Buttrey, DJ Sachan, V TI Neutron-diffraction study of stripe order in La2NiO4+delta with delta=2/15 SO PHYSICAL REVIEW B LA English DT Article ID INCOMMENSURATE MAGNETIC CORRELATIONS; PHASE-DIAGRAM; ISING-MODEL; DEVILS STAIRCASE; CHARGE; OXYGEN; HOLES; SPINS; LA2-XSRXNIO4; LA2NIO4.125 AB We report a detailed neutron-scattering study of the ordering of spins and holes in oxygen-doped La2NiO4.133. The single-crystal sample exhibits the same oxygen-interstitial order but better defined charge-stripe order than that studied previously in crystals with delta = 0.125, In particular, charge order is observed up to a temperature at least twice that of the magnetic transition, T-m = 110.5 K. On cooling through T-m, the wave vector epsilon, equal to half the charge-stripe density within an NiO2 layer, jumps discontinuously from 1/3 to 0.2944. It continues to decrease with further cooling, showing several lock-in transitions on the way down to low temperature. To explain the observed lock-ins, a model is proposed in which each charge stripe is centered on either a row of Ni or a row of O ions. The model is shown to be consistent with the l dependence of the magnetic peak intensities and with the relative intensities of the higher-order magnetic satellites, Analysis of the latter also provides evidence that the magnetic domain walls (charge stripes are relatively narrow, In combination with a recent study of magnetic-field-induced effects, we find that the charge stripes are all O centered at T> T-m, with a shift towards Ni centering at T< T-m. Inferences concerning the competing intel actions responsible for the temperature dependence of epsilon and the localization of charge within the stripes are discussed. C1 Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. Univ Delaware, Dept Chem Engn, Newark, DE 19716 USA. Univ Delaware, Mat Sci Program, Newark, DE 19716 USA. RP Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. RI Tranquada, John/A-9832-2009 OI Tranquada, John/0000-0003-4984-8857 NR 50 TC 87 Z9 88 U1 1 U2 7 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9950 EI 2469-9969 J9 PHYS REV B JI Phys. Rev. B PD JAN 1 PY 1998 VL 57 IS 2 BP 1066 EP 1078 DI 10.1103/PhysRevB.57.1066 PG 13 WC Physics, Condensed Matter SC Physics GA YR357 UT WOS:000071487300061 ER PT J AU Conover, MJ Flynn, CP Vigliante, A Gibbs, D AF Conover, MJ Flynn, CP Vigliante, A Gibbs, D TI Search for spin-slip lockins using tailored impurity layers SO PHYSICAL REVIEW B LA English DT Article ID X-RAY-SCATTERING; ER THIN-FILMS; MAGNETIC-PROPERTIES; SUPERLATTICES; HOLMIUM AB We have searched for spin-slip lockins with impurity layers introduced into Ho and Er as artificial superlattice perturbations. The locking interaction with the impurities appears to be weak or nonexistent. C1 Univ Illinois, Dept Phys, Urbana, IL 61801 USA. Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. RP Conover, MJ (reprint author), Seagate Technol, 7801 Computer Ave S, Bloomington, MN 55435 USA. NR 17 TC 1 Z9 1 U1 0 U2 1 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD JAN 1 PY 1998 VL 57 IS 2 BP R685 EP R688 DI 10.1103/PhysRevB.57.R685 PG 4 WC Physics, Condensed Matter SC Physics GA YR357 UT WOS:000071487300007 ER PT J AU Hammel, PC Statt, BW Martin, RL Chou, FC Johnston, DC Cheong, SW AF Hammel, PC Statt, BW Martin, RL Chou, FC Johnston, DC Cheong, SW TI Localized holes in superconducting lanthanum cuprate SO PHYSICAL REVIEW B LA English DT Article ID ELECTROCHEMICALLY OXIDIZED LA2CUO4+DELTA; SINGLE-CRYSTAL LA2CUO4+DELTA; PHASE-SEPARATION; OXYGENATED LA2CUO4+DELTA; OXIDATION; COPPER; MICROSTRUCTURE; LA2CUO4.032; GAP AB Copper NQR spectra demonstrate the existence of a second, anomalous copper site in lanthanum cuprate whose character is independent of the method of doping. We present a systematic NMR/NQR study of La2CuO4+delta for a range of delta, which demonstrates that the density of such sites increases with delta. Analysis of our results and of published data from La2-xSrxCuO4 indicate that a substantial fraction of the doped holes in these materials localize in CuO6 octahedra adjacent to the out-of-plane dopants, and that the anomalous sites are those neighboring a site occupied by such a pinned hole. Thus, superconductivity occurs in a CuO2 plane containing many localized holes. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Univ Toronto, Dept Phys, Toronto, ON M5S 1A7, Canada. Iowa State Univ Sci & Technol, Ames Lab, US DOE, Ames, IA 50011 USA. Iowa State Univ Sci & Technol, Dept Phys, Ames, IA 50011 USA. Lucent Technol, Bell Labs, Murray Hill, NJ 07974 USA. RP Hammel, PC (reprint author), Univ Calif Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. RI Hammel, P Chris/O-4845-2014 OI Hammel, P Chris/0000-0002-4138-4798 NR 29 TC 58 Z9 58 U1 2 U2 4 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD JAN 1 PY 1998 VL 57 IS 2 BP R712 EP R715 DI 10.1103/PhysRevB.57.R712 PG 4 WC Physics, Condensed Matter SC Physics GA YR357 UT WOS:000071487300014 ER PT J AU Tyler, AW Ando, Y Balakirev, FF Passner, A Boebinger, GE Schofield, AJ Mackenzie, AP Laborde, O AF Tyler, AW Ando, Y Balakirev, FF Passner, A Boebinger, GE Schofield, AJ Mackenzie, AP Laborde, O TI High-field study of normal-state magnetotransport in Tl2Ba2CuO6+delta SO PHYSICAL REVIEW B LA English DT Article ID HALL ANGLE; MAGNETORESISTANCE; DEPENDENCE; METALS AB We present a study of in-plane normal-state magnetotransport in single-crystal Tl2Ba2CuO6+delta in 60-T pulsed magnetic fields. In optimally doped samples (T-c similar to 80 K) the weak-magnetic-field regime extends to fields as high as 60 T, but in overdoped samples (T-c similar to 30 K) we an able to leave the weak-field regime, as shown by the behavior of both the magnetoresistance and the Hall resistance. Data from samples of both dopings provide constraints on the class of model necessary to describe normal-state transport in the cuprates. C1 Univ Cambridge, Irc Superconduct, Cambridge CB3 0HE, England. Lucent Technol, Bell Labs, Murray Hill, NJ 07974 USA. Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Univ Cambridge, Cavendish Lab, TCM, Cambridge CB3 0HE, England. CNRS, Ctr Rech Tres Basses Temp, Lab Champs Magnet Intenses, F-38042 Grenoble, France. RP Tyler, AW (reprint author), Univ Birmingham, Sch Phys & Astron, Birmingham B15 2TT, W Midlands, England. RI Schofield, Andy/C-5004-2009; Cavendish, TCM/C-9489-2009; Mackenzie, Andrew/K-6742-2015 OI Schofield, Andy/0000-0002-1218-8560; NR 17 TC 22 Z9 22 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD JAN 1 PY 1998 VL 57 IS 2 BP R728 EP R731 DI 10.1103/PhysRevB.57.R728 PG 4 WC Physics, Condensed Matter SC Physics GA YR357 UT WOS:000071487300018 ER PT J AU Kharraja, B Ghugre, SS Garg, U Janssens, RVF Carpenter, MP Crowell, B Khoo, TL Lauritsen, T Nisius, D Reviol, W Mueller, WF Riedinger, LL Kaczarowski, R AF Kharraja, B Ghugre, SS Garg, U Janssens, RVF Carpenter, MP Crowell, B Khoo, TL Lauritsen, T Nisius, D Reviol, W Mueller, WF Riedinger, LL Kaczarowski, R TI Level structures of Ru-96,Ru-97,Ru-98 high angular momentum SO PHYSICAL REVIEW C LA English DT Article ID HIGH-SPIN STATES; SHELL-MODEL; BACKGROUND SUBTRACTION; COINCIDENCE DATA; RU-95; SPECTROSCOPY; SPECTRA; TC-93; RH-95 AB The high-spin level structures of Ru-96,Ru-97,Ru-98 (Z=44) have been investigated using the Cu-65(S-36, pxn)Ru-96,Ru-97,Ru-98 (x=4,3,2) reactions. About 130 new transitions have been observed and unambiguously placed in the decay schemes of these nuclei. The level schemes have been extended up to spin J approximate to 22-34(h) over bar, and excitation energies E-x approximate to 20-24 MeV. Spherical shell model calculations have been performed and theoretical level energies compared with experimental values. Calculations using Sr-88 as the core give a reasonable agreement for the observed energy levels up to J less than or equal to 16(h) over bar (the maximum angular momentum possible within this restricted model space). The higher angular momentum states are dominated by the nu(g(9/2))(-1) configuration, associated with breaking of the N=50 core. The experimental indications for this "core breaking" are (i) the observation of gamma rays with energies E(gamma)approximate to 2 MeV at intermediate spins and (ii) the fragmentation of gamma-ray intensity into a number of branches. A cascade of E2 transitions of nearly equal transition energies has been observed in Ru-98 after the core breaking (J greater than or equal to 16(h) over bar), possibly manifesting vibrational behavior. C1 Univ Notre Dame, Dept Phys, Notre Dame, IN 46556 USA. Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA. Univ Tennessee, Dept Phys, Knoxville, TN 37996 USA. Soltan Inst Nucl Studies, PL-05400 Swierk, Poland. RP Kharraja, B (reprint author), Univ Notre Dame, Dept Phys, Notre Dame, IN 46556 USA. RI Carpenter, Michael/E-4287-2015 OI Carpenter, Michael/0000-0002-3237-5734 NR 32 TC 23 Z9 25 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JAN PY 1998 VL 57 IS 1 BP 83 EP 96 DI 10.1103/PhysRevC.57.83 PG 14 WC Physics, Nuclear SC Physics GA YR407 UT WOS:000071492200015 ER PT J AU Doring, J Pantelica, D Petrovici, A Babu, BRS Hamilton, JH Kormicki, J Lu, QH Ramayya, AV Tekyi-Mensah, OJ Tabor, SL AF Doring, J Pantelica, D Petrovici, A Babu, BRS Hamilton, JH Kormicki, J Lu, QH Ramayya, AV Tekyi-Mensah, OJ Tabor, SL TI Evidence for yrast positive-parity high-spin states in odd-odd As-72 SO PHYSICAL REVIEW C LA English DT Article ID NUCLEUS AB The parities of high-spin bands in the odd-odd nucleus As-72 have been established by measurements of the angular distributions and linear polarizations of the decay gamma rays via the Ni-62(C-13,p2n) reaction at a beam energy of 48.5 MeV. In particular, the parity change determined between the 8(+) and 7(-) states leads to positive parity for the yrast high-spin band. This band and the electromagnetic transition strengths within it are interpreted based on microscopic calculations using the VAMPIR model as arising from the intruder (pi g(9/2)x nu g(9/2)) configuration. C1 Florida State Univ, Dept Phys, Tallahassee, FL 32306 USA. Univ Notre Dame, Dept Phys, Notre Dame, IN 46556 USA. Inst Phys & Nucl Engn, R-76900 Bucharest, Romania. Vanderbilt Univ, Dept Phys, Nashville, TN 37235 USA. Joint Inst Heavy Ion Res, Oak Ridge, TN 37831 USA. Oak Ridge Inst Sci & Educ, Oak Ridge, TN 37831 USA. RP Doring, J (reprint author), Florida State Univ, Dept Phys, Tallahassee, FL 32306 USA. NR 20 TC 10 Z9 10 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JAN PY 1998 VL 57 IS 1 BP 97 EP 103 DI 10.1103/PhysRevC.57.97 PG 7 WC Physics, Nuclear SC Physics GA YR407 UT WOS:000071492200016 ER PT J AU Yu, CH Baktash, C Brinkman, MJ Jin, HQ Rudolph, D Gross, CJ Devlin, M LaFosse, DR Lerma, F Sarantites, DG Sylvan, GN Tabor, SL Birriel, I Saladin, JX Winchell, DF Wood, VQ Clark, RM Fallon, P Lee, IY Macchiavelli, AO Wells, JC Petrovici, A Schmid, KW Faessler, A AF Yu, CH Baktash, C Brinkman, MJ Jin, HQ Rudolph, D Gross, CJ Devlin, M LaFosse, DR Lerma, F Sarantites, DG Sylvan, GN Tabor, SL Birriel, I Saladin, JX Winchell, DF Wood, VQ Clark, RM Fallon, P Lee, IY Macchiavelli, AO Wells, JC Petrovici, A Schmid, KW Faessler, A TI Lifetime measurements of normally deformed and superdeformed states in Sr-82 SO PHYSICAL REVIEW C LA English DT Article ID SHAPE COEXISTENCE; TRANSITION STRENGTHS; BAND; EUROGAM; NUCLEI; ZR-84; ARRAY; RB-79 AB Lifetimes of a superdeformed band in Sr-82 were measured with the centroid shift method. The measured average quadrupole moment of this band corresponds to a quadrupole deformation of beta(2) approximate to 0.49, which is slightly smaller than both the theoretical prediction, and the measured deformation of the SD band in the neighboring isotone Zr-84. Lifetimes of high spin states of three normally deformed rotational bands in Sr-82 were also measured with the Doppler shift attenuation method technique. The quadrupole moments of these normally deformed bands show a decrease at the highest spins, supporting the predicted band terminations. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. Oak Ridge Associated Univ, Oak Ridge, TN 37831 USA. Washington Univ, St Louis, MO 63130 USA. Florida State Univ, Tallahassee, FL 32306 USA. Univ Pittsburgh, Pittsburgh, PA 15260 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. Tennessee Technol Univ, Cookeville, TN 38505 USA. Inst Phys & Nucl Engn, R-76900 Bucharest, Romania. Univ Tubingen, Inst Theoret Phys, D-72076 Tubingen, Germany. RP Yu, CH (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RI Rudolph, Dirk/D-4259-2009; Devlin, Matthew/B-5089-2013 OI Rudolph, Dirk/0000-0003-1199-3055; Devlin, Matthew/0000-0002-6948-2154 NR 27 TC 13 Z9 13 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JAN PY 1998 VL 57 IS 1 BP 113 EP 122 DI 10.1103/PhysRevC.57.113 PG 10 WC Physics, Nuclear SC Physics GA YR407 UT WOS:000071492200018 ER PT J AU Heenen, PH Janssens, RVF AF Heenen, PH Janssens, RVF TI Hartree-Fock-Bogoliubov description of quasiparticle excitations in the superdeformed wells of Hg-191,Hg-192 and Tl-192,Tl-193 SO PHYSICAL REVIEW C LA English DT Article ID YRAST LINE; BAND; LIFETIME; REGION; NUCLEI AB The properties of superdeformed bands in Hg-191,Hg-192 and Tl-192,Tl-193 have been studied using the cranked Hartree-Fock-Bogoliubov method with the Lipkin-Nogami prescription, the Skm* interaction, and a surface-delta, density-dependent pairing force. In particular, quasiparticle excitations involving intruder orbitals are analyzed in detail. Comparisons between data and calculations are performed for J((2)) moments, quadrupole moments, spins, transition energies, and alignments. C1 Free Univ Brussels, Serv Phys Nucl Theor, B-1050 Brussels, Belgium. Argonne Natl Lab, Argonne, IL 60439 USA. RP Heenen, PH (reprint author), Free Univ Brussels, Serv Phys Nucl Theor, CP 229, B-1050 Brussels, Belgium. NR 32 TC 25 Z9 25 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JAN PY 1998 VL 57 IS 1 BP 159 EP 165 DI 10.1103/PhysRevC.57.159 PG 7 WC Physics, Nuclear SC Physics GA YR407 UT WOS:000071492200025 ER PT J AU Williams, RA AF Williams, RA TI phi photoproduction near threshold with Okubo-Zweig-Iizuka evading phi NN interactions SO PHYSICAL REVIEW C LA English DT Article ID OMEGA-MESON PRODUCTION; OZI-RULE; INTERMEDIATE STATES; ANTIPROTON ANNIHILATION; KAON PHOTOPRODUCTION; STRANGENESS CONTENT; QUARK CONTENT; FORM-FACTOR; NUCLEON; PROTON AB Existing intermediate and high energy phi-photoproduction data is consistent with purely diffractive production (i.e., Pomeron exchange). However, near threshold (1.574 GeV < E-gamma(lab) less than or equal to 2.0 GeV) the energy dependence of the diffractive amplitude is not well known and nondiffractive amplitudes such as pi(0) and eta exchange, knockout, and nonzero phi NN couplings can give sizable contributions to the cross section and polarization density matrix elements of the phi-->K+K- decay angular distribution. We stress the importance of measurements with linearly polarized photons near the phi threshold to separate natural and unnatural parity exchange mechanisms. Approved and planned phi photoproduction and electroproduction experiments at Jefferson Lab will help establish the relative dynamical contributions near threshold and clarify outstanding theoretical issues related to apparent Okubo-Zweig-Lizuka violations. C1 Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. RP Williams, RA (reprint author), Hampton Univ, Dept Phys, Hampton, VA 23668 USA. EM bobw@cebaf.gov NR 59 TC 36 Z9 36 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JAN PY 1998 VL 57 IS 1 BP 223 EP 232 DI 10.1103/PhysRevC.57.223 PG 10 WC Physics, Nuclear SC Physics GA YR407 UT WOS:000071492200033 ER PT J AU Blann, M Chadwick, MB AF Blann, M Chadwick, MB TI New precompound decay model: Angular distributions SO PHYSICAL REVIEW C LA English DT Article ID MULTIPLE PREEQUILIBRIUM EMISSION; NEUTRON EMISSION; 256-MEV PROTONS; CROSS-SECTIONS; CONTINUUM; ENERGIES; ZR-90; SYSTEMATICS; MOMENTUM; INCIDENT AB A new Monte Carlo precompound decay model is used to calculate double-differential spectra using an approach based on conservation of linear momentum between an incident nucleon and the three quasiparticles activated in the collisions of the equilibration process. The angular distribution theory is presented as it is applied to the individual three-exciton cascades of the precompound model. The importance of multiple precompound decay beyond two nucleons per nucleus is illustrated for Zr-90(p,xn) reactions for incident protons up to 256 MeV. These components are shown to be important for extending the useful range of the precompound approach to energies beyond 80 MeV. The contribution to nucleon spectra due to hole conversion processes is illustrated. We compare results of the formulation described with experimental angular distributions for Zr-90(p,xn) reactions at incident energies of 45, 80, and 160 MeV, and for the Zr-90(p,xp) reactions at incident energies of 80, 160, and 200 MeV. Additionally, Pb-208(p,xn) spectra at 7.5 degrees, 30 degrees, 60 degrees, 120 degrees, and 150 degrees are compared with two experimental data sets for 256 MeV incident proton energy, and Zr-90(p,xn) spectra at the same five angles are compared with predicted results for 256 MeV incident protons. At 256 MeV incident proton energy, the higher energy emission spectra are seriously overpredicted at 60 degrees. All other results are reproduced quite well, including back-angle yields. The quasielastic peak measured at 7.5 degrees at 256 MeV incident proton energy is shown to be in quite reasonable agreement with experimental results. C1 Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. RP Blann, M (reprint author), 7210E Calabria Court, San Diego, CA 92122 USA. NR 25 TC 61 Z9 61 U1 1 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JAN PY 1998 VL 57 IS 1 BP 233 EP 243 DI 10.1103/PhysRevC.57.233 PG 11 WC Physics, Nuclear SC Physics GA YR407 UT WOS:000071492200034 ER PT J AU Kluger, Y Koch, V Randrup, J Wang, XN AF Kluger, Y Koch, V Randrup, J Wang, XN TI Dileptons from disoriented chiral condensates SO PHYSICAL REVIEW C LA English DT Article ID HIGH-ENERGY COLLISIONS; HEAVY-ION COLLISIONS; DOMAINS; PERSPECTIVE; EMISSION; PHOTON; FIELD; FORM AB Disoriented chiral condensates or long wavelength pionic oscillations and their interaction with the thermal environment can be a significant source of dileptons. We calculate the yield of such dilepton production within the linear a model. both in a quantum mean-field treatment and in a semiclassical approximation. We then illustrate the basic features of the dilepton spectrum in a schematic model. We find that dilepton yield with invariant mass near and below 2m(pi) due to the soft pion modes can be up to two orders of magnitude larger than the corresponding equilibrium yield. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Div Nucl Sci, Berkeley, CA 94720 USA. RP Kluger, Y (reprint author), Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. OI Wang, Xin-Nian/0000-0002-9734-9967 NR 28 TC 22 Z9 22 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JAN PY 1998 VL 57 IS 1 BP 280 EP 290 DI 10.1103/PhysRevC.57.280 PG 11 WC Physics, Nuclear SC Physics GA YR407 UT WOS:000071492200039 ER PT J AU Beane, SR Bernard, V Lee, TSH Meissner, UG AF Beane, SR Bernard, V Lee, TSH Meissner, UG TI Isoscalar S-wave pi-N scattering length a(+) from pi-deuteron scattering SO PHYSICAL REVIEW C LA English DT Article ID STRONG INTERACTION SHIFT; PIONIC HYDROGEN; WIDTH AB We consider constraints on the isoscalar S-wave pi-N scattering length a(+) from pi-deuteron scattering, to third order in small momenta and pion masses in chiral perturbation theory. To this order, the pi-deuteron scattering length is determined by a(+) together with three-body corrections that involve no undetermined parameters. We extract a novel value for a combination of dimension two low-energy constants which is in agreement with previous determinations. C1 Univ Maryland, Dept Phys, College Pk, MD 20742 USA. Univ Strasbourg, Phys Theor Lab, F-67037 Strasbourg 02, France. Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA. Forschungszentrum Julich, Inst Kernphys, D-52425 Julich, Germany. RP Univ Maryland, Dept Phys, College Pk, MD 20742 USA. EM sbeane@fermi.umd.edu; bernard@sbghp3.in2p3.fr; lee@anlphy.phy.anl.gov; Ulf-G.Meissner@fz-juelich.de NR 17 TC 53 Z9 53 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9985 EI 2469-9993 J9 PHYS REV C JI Phys. Rev. C PD JAN PY 1998 VL 57 IS 1 BP 424 EP 426 DI 10.1103/PhysRevC.57.424 PG 3 WC Physics, Nuclear SC Physics GA YR407 UT WOS:000071492200054 ER PT J AU Zamfir, NV Chou, WT Casten, RF AF Zamfir, NV Chou, WT Casten, RF TI Evolution of nuclear structure in O(6)-like nuclei SO PHYSICAL REVIEW C LA English DT Article ID IBA; REGION AB The evolution of nuclear structure along the Xe and Pa isotopes with N<82 is studied in comparison with that in the Pt-Os isotopes and with interacting boson approximation calculations. As is well known, the Pt isotopes from Pt189-196 exhibit a stable structure very close to O(6), the lighter Pt isotopes and the Os nuclei evolve towards a rotor, and the heaviest Pt nuclei, Pt-198,Pt-200, show a tendency towards vibrational character. In contrast, we show that the Pa nuclei are best described by a trajectory from U(5) towards SU(3) that passes through an intermediate structure that resembles O(6) for N similar to 72-76. The Xe appears to evolve from U(5) to O(6)-like. C1 Yale Univ, WNSL, New Haven, CT 06520 USA. Brookhaven Natl Lab, Upton, NY 11973 USA. Clark Univ, Worcester, MA 01610 USA. Inst Atom Phys, R-76900 Bucharest, Romania. Natl Tsing Hua Univ, Hsinchu, Taiwan. RP Zamfir, NV (reprint author), Yale Univ, WNSL, New Haven, CT 06520 USA. RI Zamfir, Nicolae Victor/F-2544-2011 NR 11 TC 17 Z9 18 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JAN PY 1998 VL 57 IS 1 BP 427 EP 429 DI 10.1103/PhysRevC.57.427 PG 3 WC Physics, Nuclear SC Physics GA YR407 UT WOS:000071492200055 ER PT J AU Haslip, DS Flibotte, S de France, G Devlin, M Galindo-Uribarri, A Gervais, G LaFosse, DR Yee, IY Lerma, F Macchiavelli, AO MacLeod, RW Mullins, SR Nieminen, JM Sarantites, DG Svensson, CE Waddington, JC Wilson, JN AF Haslip, DS Flibotte, S de France, G Devlin, M Galindo-Uribarri, A Gervais, G LaFosse, DR Yee, IY Lerma, F Macchiavelli, AO MacLeod, RW Mullins, SR Nieminen, JM Sarantites, DG Svensson, CE Waddington, JC Wilson, JN TI Superdeformation in Sm-145 SO PHYSICAL REVIEW C LA English DT Article ID NUCLEUS; BANDS; EXCITATIONS; REGION AB Two superdeformed bands have been observed in the nucleus Sm-145 in an experiment performed with the Gammasphere multidetector array. One of these bands demonstrates a sudden rise in its dynamic moment of inertia at low frequency which may be related to the interaction between N=6 Nilsson orbitals at the Fermi surface. The other band has a moment of inertia identical to the yrast band of Gd-149, making it the Fourth case in the A similar or equal to 150 mass region of identical bands in nuclei differing by an alpha particle. C1 McMaster Univ, Dept Phys & Astron, Hamilton, ON L8S 4M1, Canada. Inst Rech Subatom, F-67037 Strasbourg 02, France. Washington Univ, Dept Chem, St Louis, MO 63130 USA. Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Nucl Sci, Berkeley, CA 94720 USA. ANU, RSPHYSSE, Dept Phys Nucl, Canberra, ACT 0200, Australia. RP Haslip, DS (reprint author), McMaster Univ, Dept Phys & Astron, Hamilton, ON L8S 4M1, Canada. RI Devlin, Matthew/B-5089-2013 OI Devlin, Matthew/0000-0002-6948-2154 NR 19 TC 4 Z9 4 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JAN PY 1998 VL 57 IS 1 BP 442 EP 444 DI 10.1103/PhysRevC.57.442 PG 3 WC Physics, Nuclear SC Physics GA YR407 UT WOS:000071492200059 ER PT J AU Stoks, VGJ AF Stoks, VGJ TI Can the magnetic moment contribution explain the A(y) puzzle? SO PHYSICAL REVIEW C LA English DT Article ID NEUTRON-DEUTERON SCATTERING; ANALYZING POWER; ELASTIC-SCATTERING; BREAKUP THRESHOLD; PHASE-SHIFT; NUCLEON AB We evaluate the full one-photon-exchange Born amplitude for Nd scattering. We include the contributions due to the magnetic moment of the proton or neutron, and the magnetic moment and quadrupole moment of the deuteron. It is found that the inclusion of the magnetic-moment interaction in the theoretical description of the Nd scattering observables cannot resolve the long-standing A(y) puzzle. C1 TRIUMF, Vancouver, BC V6T 2A3, Canada. Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA. RP Stoks, VGJ (reprint author), TRIUMF, 4004 Wesbrook Mall, Vancouver, BC V6T 2A3, Canada. NR 22 TC 11 Z9 11 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JAN PY 1998 VL 57 IS 1 BP 445 EP 447 DI 10.1103/PhysRevC.57.445 PG 3 WC Physics, Nuclear SC Physics GA YR407 UT WOS:000071492200060 ER PT J AU Sarantites, DG LaFosse, DR Devlin, M Lerma, F Wood, VQ Saladin, JX Winchell, DF Baktash, C Yu, CH Fallon, P Lee, IY Macchiavelli, AO MacLeod, RW Afanasjev, AV Ragnarsson, I AF Sarantites, DG LaFosse, DR Devlin, M Lerma, F Wood, VQ Saladin, JX Winchell, DF Baktash, C Yu, CH Fallon, P Lee, IY Macchiavelli, AO MacLeod, RW Afanasjev, AV Ragnarsson, I TI Triaxial superdeformed bands in Zr-86 SO PHYSICAL REVIEW C LA English DT Article ID HIGH-SPIN; NUCLEI AB Four new superdeformed bands have been found in the nucleus Zr-86. Th, good agreement between experiment and configuration-dependent shell correction calculations suggests that three of the bands have triaxial superdeformed shapes. Such unique features in mass A similar to 80 superdeformed bands have been predicted, but not observed experimentally until now. A fourth band in Zr-86 is interesting due to a fairly constant and unusually high dynamic moment of inertia. Possible interpretations of this structure are discussed. C1 Washington Univ, Dept Chem, St Louis, MO 63130 USA. Univ Pittsburgh, Dept Phys, Pittsburgh, PA 15260 USA. Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Nucl Sci, Berkeley, CA 94720 USA. Lund Inst Technol, Dept Math Phys, S-22100 Lund, Sweden. Latvian Acad Sci, Nucl Res Ctr, LV-2169 Salaspils, Latvia. RP Sarantites, DG (reprint author), Washington Univ, Dept Chem, St Louis, MO 63130 USA. RI Devlin, Matthew/B-5089-2013 OI Devlin, Matthew/0000-0002-6948-2154 NR 19 TC 19 Z9 19 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD JAN PY 1998 VL 57 IS 1 BP R1 EP R5 DI 10.1103/PhysRevC.57.R1 PG 5 WC Physics, Nuclear SC Physics GA YR407 UT WOS:000071492200001 ER PT J AU Sheikh, JA Sun, Y Walker, PM AF Sheikh, JA Sun, Y Walker, PM TI Projected shell model analysis of tilted rotation SO PHYSICAL REVIEW C LA English DT Article ID HIGH-SPIN STATES; CRANKING MODEL; BAND AB An alternative description of tilted rotation, observed in deformed nuclei, is presented using the projected shell model approach. It is shown that a strong configuration mixing among the projected states is responsible for the appearance of the tilted bands near to, but slightly above, the yrast line in even-even tungsten isotopes. Various tilted bands in Os-184 are also predicted. C1 Univ Surrey, Dept Phys, Guildford GU2 5XH, Surrey, England. Tata Inst Fundamental Res, Bombay 400005, Maharashtra, India. Oak Ridge Natl Lab, Joint Inst Heavy Ion Res, Oak Ridge, TN 37831 USA. Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA. Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA. RP Univ Surrey, Dept Phys, Guildford GU2 5XH, Surrey, England. RI Sun, Yang/P-2417-2015 NR 20 TC 14 Z9 15 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9985 EI 2469-9993 J9 PHYS REV C JI Phys. Rev. C PD JAN PY 1998 VL 57 IS 1 BP R26 EP R30 DI 10.1103/PhysRevC.57.R26 PG 5 WC Physics, Nuclear SC Physics GA YR407 UT WOS:000071492200007 ER PT J AU Aitala, EM Amato, S Anjos, JC Appel, JA Ashery, D Banerjee, S Bediaga, I Blaylock, G Bracker, SB Burchat, PR Burnstein, RA Carter, T Carvalho, HS Copty, NK Cremaldi, LM Darling, C Fernandez, A Gagnon, P Gobel, C Gounder, K Halling, AM Herrera, G Hurvits, G James, C Kasper, PA Kwan, S Langs, DC Leslie, J Lundberg, B MayTal-Beck, S Meadows, B Neto, JRTD Milburn, RH de Miranda, JM Napier, A Nguyen, A d'Oliveira, AB O'Shaughnessy, K Peng, KC Perera, LP Purohit, MV Quinn, B Radeztsky, S Rafatian, A Reay, NW Reidy, JJ dos Reis, AC Rubin, HA Santha, PKS Santoro, AFS Schwartz, AJ Sheaff, M Sidwell, RA Slaughter, AJ Sokoloff, MD Stanton, NR Stenson, K Summers, DJ Takach, S Thorne, K Tripathi, AK Watanabe, S Weiss-Babai, R Wiener, J Witchey, N Wolin, E Yi, D Yoshida, S Zaliznyak, R Zhang, C AF Aitala, EM Amato, S Anjos, JC Appel, JA Ashery, D Banerjee, S Bediaga, I Blaylock, G Bracker, SB Burchat, PR Burnstein, RA Carter, T Carvalho, HS Copty, NK Cremaldi, LM Darling, C Fernandez, A Gagnon, P Gobel, C Gounder, K Halling, AM Herrera, G Hurvits, G James, C Kasper, PA Kwan, S Langs, DC Leslie, J Lundberg, B MayTal-Beck, S Meadows, B Neto, JRTD Milburn, RH de Miranda, JM Napier, A Nguyen, A d'Oliveira, AB O'Shaughnessy, K Peng, KC Perera, LP Purohit, MV Quinn, B Radeztsky, S Rafatian, A Reay, NW Reidy, JJ dos Reis, AC Rubin, HA Santha, PKS Santoro, AFS Schwartz, AJ Sheaff, M Sidwell, RA Slaughter, AJ Sokoloff, MD Stanton, NR Stenson, K Summers, DJ Takach, S Thorne, K Tripathi, AK Watanabe, S Weiss-Babai, R Wiener, J Witchey, N Wolin, E Yi, D Yoshida, S Zaliznyak, R Zhang, C CA Fermilab E791 Collaboration TI Search for D-0-(D)over-bar(0) mixing and doubly-Cabibbo-suppressed decays of the D-0 in hadronic final states SO PHYSICAL REVIEW D LA English DT Article ID CP VIOLATION; PHYSICS; BOUNDS; SYSTEM AB We present results of a search for D-0-(D) over bar(0) mixing and doubly-Cabibbo-suppressed decays of the D-0 in Fermilab experiment E791, a fixed-target charm hadroproduction experiment. We look for evidence of mixing in the decay chain D* --> pi D--> pi(K pi or K pi pi pi). If the charge of the pion from the D* decay is the same as the charge of the kaon from the D decay (a "wrong-sign" event), mixing may have occurred. Mixing can be distinguished from other sources of wrong-sign events (such as doubly-Cabibbo-suppressed decays) by analyzing the distribution of decay times. We see no evidence of mixing. Allowing for CP violation in the interference between DCS and mixing amplitudes our fitted ratio for mixed to unmixed decay rates is r(mix) = (0.39(-0.32)(+0.36)+/-0.16)%. This corresponds to a 90% C.L. upper limit of r(mix)<0.85%. The sensitivity of this is comparable to that of previous measurements, but the assumptions made in fitting the data are notably more general. We present results from many fits to our data under Various assumptions. If we assume r(mix) = 0, we find a two-sigma wrong-sign enhancement in the K pi mode which we ascribe to doubly Cabibbo-suppressed decays. The ratios of doubly Cabibbo-suppressed decays to Cabibbo-favored decays are r(dcs) (K pi) = (0.68(-0.33)(+0.34)+/-0.07)% and r(dcs)(K pi pi pi) = (0.25(-0.34)(+0.36)+/-0.03)%. [S0556-2821(98)01103-5]. C1 Ctr Brasileiro Pesquisas Fis, Rio De Janeiro, Brazil. Univ Calif Santa Cruz, Santa Cruz, CA 95064 USA. Univ Cincinnati, Cincinnati, OH 45221 USA. CINVESTAV, Mexico City 14000, DF, Mexico. Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. Illinois Inst Technol, Chicago, IL 60616 USA. Kansas State Univ, Manhattan, KS 66506 USA. Univ Massachusetts, Amherst, MA 01003 USA. Univ Mississippi, University, MS 38677 USA. Ohio State Univ, Columbus, OH 43210 USA. Princeton Univ, Princeton, NJ 08544 USA. Univ Autonoma Puebla, Puebla 72570, Mexico. Univ S Carolina, Columbia, SC 29208 USA. Stanford Univ, Stanford, CA 94305 USA. Tel Aviv Univ, IL-69978 Tel Aviv, Israel. Tufts Univ, Medford, MA 02155 USA. Univ Wisconsin, Madison, WI 53706 USA. Yale Univ, New Haven, CT 06511 USA. RP Aitala, EM (reprint author), Ctr Brasileiro Pesquisas Fis, Rio De Janeiro, Brazil. RI Anjos, Joao/C-8335-2013; Santoro, Alberto/E-7932-2014; Gobel Burlamaqui de Mello, Carla /H-4721-2016 OI Gobel Burlamaqui de Mello, Carla /0000-0003-0523-495X NR 30 TC 51 Z9 51 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD JAN 1 PY 1998 VL 57 IS 1 BP 13 EP 27 DI 10.1103/PhysRevD.57.13 PG 15 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA YP838 UT WOS:000071320700004 ER PT J AU Bai, JZ Bardon, O Blum, I Breakstone, A Burnett, T Chen, GP Chen, HF Chen, J Chen, SJ Chen, SM Chen, Y Chen, YB Chen, YQ Cheng, BS Cowan, RF Cui, XZ Ding, HL Du, ZZ Dunwoodie, W Fan, XL Fang, J Gao, CS Gao, ML Gao, SQ Gratton, P Gu, JH Gu, SD Gu, WX Gu, YF Guo, YN Han, SW Han, Y Harris, FA He, J He, M Hitlin, DG Hu, GY Hu, T Hu, XQ Huang, DQ Izen, JM Jiang, CH Jin, S Jin, Y Jones, L Kang, SH Ke, ZJ Kelsey, MH Kim, BR Kong, D Lai, YF Lan, HB Lang, PF Lankford, A Li, F Li, J Li, PP Li, Q Li, RB Li, W Li, WD Li, WG Li, XH Li, XN Lin, SZ Liu, HM Liu, J Liu, JH Liu, Q Liu, RG Liu, Y Liu, ZA Lou, XC Lowery, B Lu, JG Lu, JY Luo, S Luo, Y Ma, AM Ma, EC Ma, JM Malchow, R Mandelkern, M Mao, HS Ma, ZP Meng, XC Ni, HL Nie, J Olsen, SL Oyang, J Paluselli, D Pan, LJ Panetta, J Porter, F Prabhakar, E Qi, ND Que, YK Rong, G Schernau, M Schmid, B Schultz, J Shao, YY Shen, DL Shen, H Shen, XY Sheng, HY Shi, HZ Soderstrom, E Song, XF Standifird, J Stoker, D Sun, F Sun, HS Sun, SJ Synodinos, J Tan, YP Tang, SQ Toki, W Tong, GL Wang, F Wang, LS Wang, LZ Wang, M Wang, P Wang, PL Wang, SM Wang, TJ Wang, YY Weaver, M Wei, CL Wisniewski, WJ Xi, DM Xia, XM Xie, PP Xu, DZ Xu, RS Xu, ZQ Xue, ST Yan, J Yan, WG Yang, CM Yang, CY Yang, H Yang, W Ye, MH Ye, SZ Young, K Yu, CS Yu, CX Yu, ZQ Yuan, CZ Zhang, BY Zhang, CC Zhang, DH Zhang, HL Zhang, J Zhang, JW Zhang, LS Zhang, SQ Zhang, Y Zhang, YY Zhao, DX Zhao, JW Zhao, M Zhao, WR Zheng, JP Zheng, LS Zheng, ZP Zhou, GP Zhou, HS Zhou, L Zhou, XF Zhou, YH Zhu, QM Zhu, YC Zhu, YS Zhuang, BA AF Bai, JZ Bardon, O Blum, I Breakstone, A Burnett, T Chen, GP Chen, HF Chen, J Chen, SJ Chen, SM Chen, Y Chen, YB Chen, YQ Cheng, BS Cowan, RF Cui, XZ Ding, HL Du, ZZ Dunwoodie, W Fan, XL Fang, J Gao, CS Gao, ML Gao, SQ Gratton, P Gu, JH Gu, SD Gu, WX Gu, YF Guo, YN Han, SW Han, Y Harris, FA He, J He, M Hitlin, DG Hu, GY Hu, T Hu, XQ Huang, DQ Izen, JM Jiang, CH Jin, S Jin, Y Jones, L Kang, SH Ke, ZJ Kelsey, MH Kim, BR Kong, D Lai, YF Lan, HB Lang, PF Lankford, A Li, F Li, J Li, PP Li, Q Li, RB Li, W Li, WD Li, WG Li, XH Li, XN Lin, SZ Liu, HM Liu, J Liu, JH Liu, Q Liu, RG Liu, Y Liu, ZA Lou, XC Lowery, B Lu, JG Lu, JY Luo, S Luo, Y Ma, AM Ma, EC Ma, JM Malchow, R Mandelkern, M Mao, HS Ma, ZP Meng, XC Ni, HL Nie, J Olsen, SL Oyang, J Paluselli, D Pan, LJ Panetta, J Porter, F Prabhakar, E Qi, ND Que, YK Rong, G Schernau, M Schmid, B Schultz, J Shao, YY Shen, DL Shen, H Shen, XY Sheng, HY Shi, HZ Soderstrom, E Song, XF Standifird, J Stoker, D Sun, F Sun, HS Sun, SJ Synodinos, J Tan, YP Tang, SQ Toki, W Tong, GL Wang, F Wang, LS Wang, LZ Wang, M Wang, P Wang, PL Wang, SM Wang, TJ Wang, YY Weaver, M Wei, CL Wisniewski, WJ Xi, DM Xia, XM Xie, PP Xu, DZ Xu, RS Xu, ZQ Xue, ST Yan, J Yan, WG Yang, CM Yang, CY Yang, H Yang, W Ye, MH Ye, SZ Young, K Yu, CS Yu, CX Yu, ZQ Yuan, CZ Zhang, BY Zhang, CC Zhang, DH Zhang, HL Zhang, J Zhang, JW Zhang, LS Zhang, SQ Zhang, Y Zhang, YY Zhao, DX Zhao, JW Zhao, M Zhao, WR Zheng, JP Zheng, LS Zheng, ZP Zhou, GP Zhou, HS Zhou, L Zhou, XF Zhou, YH Zhu, QM Zhu, YC Zhu, YS Zhuang, BA CA BES Collaboration TI Direct measurement of B(D-s(+)->phi X+) SO PHYSICAL REVIEW D LA English DT Article AB The absolute inclusive branching fraction of D-s(+)-->phi X+ has been measured from data collected by the BES detector at a center-of-mass energy of 4.03 GeV, corresponding to an integrated luminosity of 22.3 pb(-1). At this energy, direct pair production e(+)e(-)-->Ds+Ds- has been observed. We have selected D-s candidate events by reconstructing five hadronic decay modes D-s(+) -->phi pi(+), (K) over bar(0)*K+,(K) over bar(0)K(+), f(0) pi(+) and K(0)K(-)pi(+)pi(+) and have searched for inclusive phi's in the recoiling D-s(-). We observed three recoiling phi's in the 166.4 +/- 31.8 D-s candidate events, which leads to the absolute branching fraction B(D-s(+)-->phi X+) = (17.8+(+15.1)(-7.2) (+0.6)(-6.3)) % and B(D-s(+)-->phi pi(+)) = (3.6(-1.6)(-1.3)(+3.1)(+0.4)) %. [S0556-2821(97)02423-5]. C1 Acad Sinica, Inst High Energy Phys, Beijing 100039, Peoples R China. CALTECH, Pasadena, CA 91125 USA. Univ Sci & Technol China, Hefei 230026, Peoples R China. Colorado State Univ, Ft Collins, CO 80523 USA. MIT, Cambridge, MA 02139 USA. Shandong Univ, Jinan 250100, Peoples R China. Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. Univ Hawaii, Honolulu, HI 96822 USA. Univ Calif Irvine, Irvine, CA 92717 USA. Univ Texas, Richardson, TX 75083 USA. Univ Washington, Seattle, WA 98195 USA. RP Bai, JZ (reprint author), Acad Sinica, Inst High Energy Phys, Beijing 100039, Peoples R China. RI Chen, Yu/E-3788-2012 NR 8 TC 7 Z9 7 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD JAN 1 PY 1998 VL 57 IS 1 BP 28 EP 32 DI 10.1103/PhysRevD.57.28 PG 5 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA YP838 UT WOS:000071320700005 ER PT J AU Gronberg, J Hill, TS Kutschke, R Lange, DJ Menary, S Morrison, RJ Nelson, HN Nelson, TK Qiao, C Richman, JD Roberts, D Ryd, A Witherell, MS Balest, R Behrens, BH Ford, WT Park, H Roy, J Smith, JG Alexander, JP Bebek, C Berger, BE Berkelman, K Bloom, K Cassel, DG Cho, HA Coffman, DM Crowcroft, DS Dickson, M Drell, PS Ecklund, KM Ehrlich, R Elia, R Foland, AD Gaidarev, P Galik, RS Gittelman, B Gray, SW Hartill, DL Heltsley, BK Hopman, PI Kandaswamy, J Kim, PC Kreinick, DL Lee, T Liu, Y Ludwig, GS Masui, J Mevissen, J Mistry, NB Ng, CR Nordberg, E Ogg, M Patterson, JR Peterson, D Riley, D Soffer, A Valant-Spaight, B Ward, C Athanas, M Avery, P Jones, CD Lohner, M Prescott, C Yelton, J Zheng, J Brandenburg, G Briere, RA Gao, YS Kim, DYJ Wilson, R Yamamoto, H Browder, TE Li, F Li, Y Rodriguez, JL Bergfeld, T Eisenstein, BI Ernst, J Gladding, GE Gollin, GD Hans, RM Johnson, E Karliner, I Marsh, MA Palmer, M Selen, M Thaler, JJ Edwards, KW Bellerive, A Janicek, R MacFarlane, DB McLean, KW Patel, PM Sadoff, AJ Ammar, R Baringer, P Bean, A Besson, D Coppage, D Darling, C Davis, R Hancock, N Kotov, S Kravchenko, I Kwak, N Anderson, S Kubota, Y Lattery, M Lee, SJ O'Neill, JJ Patton, S Poling, R Riehle, T Savinov, V Smith, A Alam, MS Athar, SB Ling, Z Mahmood, AH Severini, H Timm, S Wappler, F Anastassov, A Blinov, S Duboscq, JE Fisher, KD Fujino, D Gan, KK Hart, T Honscheid, K Kagan, H Kass, R Lee, J Spencer, MB Sung, M Undrus, A Wanke, R Wolf, A Zoeller, MM Nemati, B Richichi, SJ Ross, WR Skubic, P Bishai, M Fast, J Gerndt, E Hinson, JW Menon, N Miller, DH Shibata, EI Shipsey, IPJ Yurko, M Gibbons, L Glenn, S Johnson, SD Kwon, Y Roberts, S Thorndike, EH Jessop, CP Lingel, K Marsiske, H Perl, ML Ugolini, D Wang, R Zhou, X Coan, TE Fadeyev, V Korolkov, I Maravin, Y Narsky, I Shelkov, V Staeck, J Stroynowski, R Volobouev, I Ye, J Artuso, M Efimov, A Frasconi, F Gao, M Goldberg, M He, D Kopp, S Moneti, GC Mountain, R Schuh, S Skwarnicki, T Stone, S Viehhauser, G Xing, X Bartelt, J Csorna, SE Jain, V Marka, S Godang, R Kinoshita, K Lai, IC Pomianowski, P Schrenk, S Bonvicini, G Cinabro, D Greene, R Perera, LP Zhou, GJ Barish, B Chadha, M Chan, S Eigen, G Miller, JS O'Grady, C Schmidtler, M Urheim, J Weinstein, AJ Wurthwein, F Asner, DM Bliss, DW Masek, G Paar, HP Prell, S Sivertz, M Sharma, V AF Gronberg, J Hill, TS Kutschke, R Lange, DJ Menary, S Morrison, RJ Nelson, HN Nelson, TK Qiao, C Richman, JD Roberts, D Ryd, A Witherell, MS Balest, R Behrens, BH Ford, WT Park, H Roy, J Smith, JG Alexander, JP Bebek, C Berger, BE Berkelman, K Bloom, K Cassel, DG Cho, HA Coffman, DM Crowcroft, DS Dickson, M Drell, PS Ecklund, KM Ehrlich, R Elia, R Foland, AD Gaidarev, P Galik, RS Gittelman, B Gray, SW Hartill, DL Heltsley, BK Hopman, PI Kandaswamy, J Kim, PC Kreinick, DL Lee, T Liu, Y Ludwig, GS Masui, J Mevissen, J Mistry, NB Ng, CR Nordberg, E Ogg, M Patterson, JR Peterson, D Riley, D Soffer, A Valant-Spaight, B Ward, C Athanas, M Avery, P Jones, CD Lohner, M Prescott, C Yelton, J Zheng, J Brandenburg, G Briere, RA Gao, YS Kim, DYJ Wilson, R Yamamoto, H Browder, TE Li, F Li, Y Rodriguez, JL Bergfeld, T Eisenstein, BI Ernst, J Gladding, GE Gollin, GD Hans, RM Johnson, E Karliner, I Marsh, MA Palmer, M Selen, M Thaler, JJ Edwards, KW Bellerive, A Janicek, R MacFarlane, DB McLean, KW Patel, PM Sadoff, AJ Ammar, R Baringer, P Bean, A Besson, D Coppage, D Darling, C Davis, R Hancock, N Kotov, S Kravchenko, I Kwak, N Anderson, S Kubota, Y Lattery, M Lee, SJ O'Neill, JJ Patton, S Poling, R Riehle, T Savinov, V Smith, A Alam, MS Athar, SB Ling, Z Mahmood, AH Severini, H Timm, S Wappler, F Anastassov, A Blinov, S Duboscq, JE Fisher, KD Fujino, D Gan, KK Hart, T Honscheid, K Kagan, H Kass, R Lee, J Spencer, MB Sung, M Undrus, A Wanke, R Wolf, A Zoeller, MM Nemati, B Richichi, SJ Ross, WR Skubic, P Bishai, M Fast, J Gerndt, E Hinson, JW Menon, N Miller, DH Shibata, EI Shipsey, IPJ Yurko, M Gibbons, L Glenn, S Johnson, SD Kwon, Y Roberts, S Thorndike, EH Jessop, CP Lingel, K Marsiske, H Perl, ML Ugolini, D Wang, R Zhou, X Coan, TE Fadeyev, V Korolkov, I Maravin, Y Narsky, I Shelkov, V Staeck, J Stroynowski, R Volobouev, I Ye, J Artuso, M Efimov, A Frasconi, F Gao, M Goldberg, M He, D Kopp, S Moneti, GC Mountain, R Schuh, S Skwarnicki, T Stone, S Viehhauser, G Xing, X Bartelt, J Csorna, SE Jain, V Marka, S Godang, R Kinoshita, K Lai, IC Pomianowski, P Schrenk, S Bonvicini, G Cinabro, D Greene, R Perera, LP Zhou, GJ Barish, B Chadha, M Chan, S Eigen, G Miller, JS O'Grady, C Schmidtler, M Urheim, J Weinstein, AJ Wurthwein, F Asner, DM Bliss, DW Masek, G Paar, HP Prell, S Sivertz, M Sharma, V CA CLEO Collaboration TI Measurements of the meson-photon transition form factors of light pseudoscalar mesons at large momentum transfer SO PHYSICAL REVIEW D LA English DT Article ID QCD SUM-RULES; CLEO-II DETECTOR; EXCLUSIVE PROCESSES; QUANTUM CHROMODYNAMICS; SUDAKOV SUPPRESSION; TRANSVERSE-MOMENTUM; ASYMPTOTIC-BEHAVIOR; PERTURBATIVE QCD; GAMMA-GAMMA-ASTERISK->PI(0); PHYSICS AB Using the CLEO II detector, we have measured the differential cross sections for exclusive two-photon production of light pseudoscalar mesons pi(0), eta, and eta'. From our measurements we have obtained the form factors associated with the electromagnetic transitions gamma* gamma-->meson. We have measured these form factors in the momentum transfer ranges from 1.5 to 9, 20, and 30 GeV2 for pi(0), eta, and eta', respectively, and have made comparisons to various theoretical predictions. [S0556-2821(98)01001-7]. C1 Univ Calif Santa Barbara, Santa Barbara, CA 93106 USA. Univ Colorado, Boulder, CO 80309 USA. Cornell Univ, Ithaca, NY 14853 USA. Univ Florida, Gainesville, FL 32611 USA. Harvard Univ, Cambridge, MA 02138 USA. Univ Hawaii Manoa, Honolulu, HI 96822 USA. Univ Illinois, Urbana, IL 61801 USA. Carleton Univ, Ottawa, ON K1S 5B6, Canada. Inst Particle Phys, Montreal, PQ, Canada. McGill Univ, Montreal, PQ H3A 2T8, Canada. Ithaca Coll, Ithaca, NY 14850 USA. Univ Kansas, Lawrence, KS 66045 USA. Univ Minnesota, Minneapolis, MN 55455 USA. SUNY Albany, Albany, NY 12222 USA. Ohio State Univ, Columbus, OH 43210 USA. Univ Oklahoma, Norman, OK 73019 USA. Purdue Univ, W Lafayette, IN 47907 USA. Univ Rochester, Rochester, NY 14627 USA. Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. So Methodist Univ, Dallas, TX 75275 USA. Syracuse Univ, Syracuse, NY 13244 USA. Vanderbilt Univ, Nashville, TN 37235 USA. Virginia Polytech Inst & State Univ, Blacksburg, VA 24061 USA. Wayne State Univ, Detroit, MI 48202 USA. CALTECH, Pasadena, CA 91125 USA. Univ Calif San Diego, La Jolla, CA 92093 USA. Univ Texas, Austin, TX 78712 USA. BINP, RU-630090 Novosibirsk, Russia. Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. RP Gronberg, J (reprint author), Univ Calif Santa Barbara, Santa Barbara, CA 93106 USA. RI Briere, Roy/N-7819-2014; Frasconi, Franco/K-1068-2016; OI Briere, Roy/0000-0001-5229-1039; Frasconi, Franco/0000-0003-4204-6587; Bean, Alice/0000-0001-5967-8674; Kutschke, Robert/0000-0001-9315-2879; Poling, Ronald/0000-0001-7305-4702; Bloom, Kenneth/0000-0002-4272-8900 NR 64 TC 419 Z9 422 U1 1 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD JAN 1 PY 1998 VL 57 IS 1 BP 33 EP 54 DI 10.1103/PhysRevD.57.33 PG 22 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA YP838 UT WOS:000071320700006 ER PT J AU Abe, F Akimoto, H Akopian, A Albrow, MG Amendolia, SR Amidei, D Antos, J Aota, S Apollinari, G Asakawa, T Ashmanskas, W Atac, M Azfar, F Azzi-Bacchetta, P Bacchetta, N Badgett, W Bagdasarov, S Bailey, MW Bao, J de Barbaro, P Barbaro-Galtieri, A Barnes, VE Barnett, BA Barone, M Barzi, E Bauer, G Baumann, T Bedeschi, F Behrends, S Belforte, S Bellettini, G Bellinger, J Benjamin, D Benlloch, J Bensinger, J Benton, D Beretvas, A Berge, JP Berryhill, J Bertolucci, S Bevensee, B Bhatti, A Biery, K Binkley, M Bisello, D Blair, RE Blocker, C Bodek, A Bokhari, W Bolognesi, V Bolla, G Bortoletto, D Boudreau, J Breccia, L Bromberg, C Bruner, N Buckley-Geer, E Budd, HS Burkett, K Busetto, G Byon-Wagner, A Byrum, KL Cammerata, J Campagnari, C Campbell, M Caner, A Carithers, W Carlsmith, D Castro, A Cauz, D Cen, Y Cervelli, F Chang, PS Chang, PT Chao, HY Chapman, J Cheng, MT Chiarelli, G Chikamatsu, T Chiou, CN Christofek, L Cihangir, S Clark, AG Cobal, M Cocca, E Contreras, M Conway, J Cooper, J Cordelli, M Couyoumtzelis, C Crane, D Cronin-Hennessy, D Culbertson, R Daniels, T DeJongh, F Delchamps, S Dell'Agnello, S Dell'Orso, M Demina, R Demortier, L Deninno, M Derwent, PF Devlin, T Dittmann, JR Donati, S Done, J Dorigo, T Dunn, A Eddy, N Einsweiler, K Elias, JE Ely, R Engels, E Errede, D Errede, S Fan, Q Feild, G Ferretti, C Fiori, I Flaugher, B Foster, GW Franklin, M Frautschi, M Freeman, J Friedman, J Frisch, H Fukui, Y Funaki, S Galeotti, S Gallinaro, M Ganel, O Garcia-Sciveres, M Garfinkel, AF Gay, C Geer, S Gerdes, DW Giannetti, P Giokaris, N Giromini, P Giusti, G Gladney, L Glenzinski, D Gold, M Gonzalez, J Gordon, A Goshaw, AT Gotra, Y Goulianos, K Grassmann, H Groer, L Grosso-Pilcher, C Guillian, G Guo, RS Haber, C Hafen, E Hahn, SR Hamilton, R Handler, R Hans, RM Happacher, F Hara, K Hardman, AD Harral, B Harris, RM Hauger, SA Hauser, J Hawk, C Hayashi, E Heinrich, J Hinrichsen, B Hoffman, KD Hohlmann, M Holck, C Hollebeek, R Holloway, L Hong, S Houk, G Hu, P Huffman, BT Hughes, R Huston, J Huth, J Hylen, J Ikeda, H Incagli, M Incandela, J Introzzi, G Iwai, J Iwata, Y Jensen, H Joshi, U Kadel, RW Kajfasz, E Kambara, H Kamon, T Kaneko, T Karr, K Kasha, H Kato, Y Keaffaber, TA Kelley, K Kennedy, RD Kephart, R Kesten, P Kestenbaum, D Keutelian, H Keyvan, F Kharadia, B Kim, BJ Kim, DH Kim, HS Kim, SB Kim, SH Kim, YK Kirsch, L Koehn, P Kondo, K Konigsberg, J Kopp, S Kordas, K Korytov, A Koska, W Kovacs, E Kowald, W Krasberg, M Kroll, J Kruse, M Kuwabara, T Kuhlmann, SE Kuns, E Laasanen, AT Lami, S Lammel, S Lamoureux, JI Lancaster, M LeCompte, T Leone, S Lewis, JD Limon, P Lindgren, M Liss, TM Liu, JB Liu, YC Lockyer, N Long, O Loomis, C Loreti, M Lu, J Lucchesi, D Lukens, P Lusin, S Lys, J Maeshima, K Maghakian, A Maksimovic, P Mangano, M Mansour, J Mariotti, M Marriner, JP Martin, A Matthews, JAJ Mattingly, R McIntyre, P Melese, P Menzione, A Meschi, E Metzler, S Miao, C Miao, T Michail, G Miller, R Minato, H Miscetti, S Mishina, M Mitsushio, H Miyamoto, T Miyashita, S Moggi, N Morita, Y Mukherjee, A Muller, T Murat, P Nakada, H Nakano, I Nelson, C Neuberger, D Newman-Holmes, C Ngan, CYP Ninomiya, M Nodulman, L Oh, SH Ohl, KE Ohmoto, T Ohsugi, T Oishi, R Okabe, M Okusawa, T Oliveira, R Olsen, J Pagliarone, C Paoletti, R Papadimitriou, V Pappas, SP Parashar, N Park, S Parri, A Patrick, J Pauletta, G Paulini, M Perazzo, A Pescara, L Peters, MD Phillips, TJ Piacentino, G Pillai, M Pitts, KT Plunkett, R Pondrom, L Proudfoot, J Ptohos, F Punzi, G Ragan, K Reher, D Ribon, A Rimondi, F Ristori, L Robertson, WJ Rodrigo, T Rolli, S Romano, J Rosenson, L Roser, R Saab, T Sakumoto, WK Saltzberg, D Sansoni, A Santi, L Sato, H Schlabach, P Schmidt, EE Schmidt, MP Scribano, A Segler, S Seidel, S Seiya, Y Sganos, G Shapiro, MD Shaw, NM Shen, Q Shepard, PF Shimojima, M Shochet, M Siegrist, J Sill, A Sinervo, P Singh, P Skarha, J Sliwa, K Snider, FD Song, T Spalding, J Speer, T Sphicas, P Spinella, F Spiropulu, M Spiegel, L Stanco, L Steele, J Stefanini, A Strahl, K Strait, J Strohmer, R Stuart, D Sullivan, G Sumorok, K Suzuki, J Takada, T Takahashi, T Takano, T Takikawa, K Tamura, N Tannenbaum, B Tartarelli, F Taylor, M Teng, PK Teramoto, Y Tether, S Theriot, D Thomas, TL Thun, R Thurman-Keup, R Timko, M Tipton, P Titov, A Tkaczyk, S Toback, D Tollefson, K Tollestrup, A Toyoda, H Trischuk, W de Troconiz, JF Truitt, S Tseng, J Turini, N Uchida, T Uemura, N Ukegawa, F Unal, G Valls, J van den Brink, SC Vejcik, S Velev, G Vidal, R Vilar, R Vondracek, M Vucinic, D Wagner, RG Wagner, RL Wahl, J Wallace, NB Walsh, AM Wang, C Wang, CH Wang, J Wang, MJ Wang, QF Warburton, A Watts, T Webb, R Wei, C Wenzel, H Wester, WC Wicklund, AB Wicklund, E Wilkinson, R Williams, HH Wilson, P Winer, BL Winn, D Wolinski, D Wolinski, J Worm, S Wu, X Wyss, J Yagil, A Yao, W Yasuoka, K Ye, Y Yeh, GP Yeh, P Yin, M Yoh, J Yosef, C Yoshida, T Yovanovitch, D Yu, I Yu, L Yun, JC Zanetti, A Zetti, F Zhang, L Zhang, W Zucchelli, S AF Abe, F Akimoto, H Akopian, A Albrow, MG Amendolia, SR Amidei, D Antos, J Aota, S Apollinari, G Asakawa, T Ashmanskas, W Atac, M Azfar, F Azzi-Bacchetta, P Bacchetta, N Badgett, W Bagdasarov, S Bailey, MW Bao, J de Barbaro, P Barbaro-Galtieri, A Barnes, VE Barnett, BA Barone, M Barzi, E Bauer, G Baumann, T Bedeschi, F Behrends, S Belforte, S Bellettini, G Bellinger, J Benjamin, D Benlloch, J Bensinger, J Benton, D Beretvas, A Berge, JP Berryhill, J Bertolucci, S Bevensee, B Bhatti, A Biery, K Binkley, M Bisello, D Blair, RE Blocker, C Bodek, A Bokhari, W Bolognesi, V Bolla, G Bortoletto, D Boudreau, J Breccia, L Bromberg, C Bruner, N Buckley-Geer, E Budd, HS Burkett, K Busetto, G Byon-Wagner, A Byrum, KL Cammerata, J Campagnari, C Campbell, M Caner, A Carithers, W Carlsmith, D Castro, A Cauz, D Cen, Y Cervelli, F Chang, PS Chang, PT Chao, HY Chapman, J Cheng, MT Chiarelli, G Chikamatsu, T Chiou, CN Christofek, L Cihangir, S Clark, AG Cobal, M Cocca, E Contreras, M Conway, J Cooper, J Cordelli, M Couyoumtzelis, C Crane, D Cronin-Hennessy, D Culbertson, R Daniels, T DeJongh, F Delchamps, S Dell'Agnello, S Dell'Orso, M Demina, R Demortier, L Deninno, M Derwent, PF Devlin, T Dittmann, JR Donati, S Done, J Dorigo, T Dunn, A Eddy, N Einsweiler, K Elias, JE Ely, R Engels, E Errede, D Errede, S Fan, Q Feild, G Ferretti, C Fiori, I Flaugher, B Foster, GW Franklin, M Frautschi, M Freeman, J Friedman, J Frisch, H Fukui, Y Funaki, S Galeotti, S Gallinaro, M Ganel, O Garcia-Sciveres, M Garfinkel, AF Gay, C Geer, S Gerdes, DW Giannetti, P Giokaris, N Giromini, P Giusti, G Gladney, L Glenzinski, D Gold, M Gonzalez, J Gordon, A Goshaw, AT Gotra, Y Goulianos, K Grassmann, H Groer, L Grosso-Pilcher, C Guillian, G Guo, RS Haber, C Hafen, E Hahn, SR Hamilton, R Handler, R Hans, RM Happacher, F Hara, K Hardman, AD Harral, B Harris, RM Hauger, SA Hauser, J Hawk, C Hayashi, E Heinrich, J Hinrichsen, B Hoffman, KD Hohlmann, M Holck, C Hollebeek, R Holloway, L Hong, S Houk, G Hu, P Huffman, BT Hughes, R Huston, J Huth, J Hylen, J Ikeda, H Incagli, M Incandela, J Introzzi, G Iwai, J Iwata, Y Jensen, H Joshi, U Kadel, RW Kajfasz, E Kambara, H Kamon, T Kaneko, T Karr, K Kasha, H Kato, Y Keaffaber, TA Kelley, K Kennedy, RD Kephart, R Kesten, P Kestenbaum, D Keutelian, H Keyvan, F Kharadia, B Kim, BJ Kim, DH Kim, HS Kim, SB Kim, SH Kim, YK Kirsch, L Koehn, P Kondo, K Konigsberg, J Kopp, S Kordas, K Korytov, A Koska, W Kovacs, E Kowald, W Krasberg, M Kroll, J Kruse, M Kuwabara, T Kuhlmann, SE Kuns, E Laasanen, AT Lami, S Lammel, S Lamoureux, JI Lancaster, M LeCompte, T Leone, S Lewis, JD Limon, P Lindgren, M Liss, TM Liu, JB Liu, YC Lockyer, N Long, O Loomis, C Loreti, M Lu, J Lucchesi, D Lukens, P Lusin, S Lys, J Maeshima, K Maghakian, A Maksimovic, P Mangano, M Mansour, J Mariotti, M Marriner, JP Martin, A Matthews, JAJ Mattingly, R McIntyre, P Melese, P Menzione, A Meschi, E Metzler, S Miao, C Miao, T Michail, G Miller, R Minato, H Miscetti, S Mishina, M Mitsushio, H Miyamoto, T Miyashita, S Moggi, N Morita, Y Mukherjee, A Muller, T Murat, P Nakada, H Nakano, I Nelson, C Neuberger, D Newman-Holmes, C Ngan, CYP Ninomiya, M Nodulman, L Oh, SH Ohl, KE Ohmoto, T Ohsugi, T Oishi, R Okabe, M Okusawa, T Oliveira, R Olsen, J Pagliarone, C Paoletti, R Papadimitriou, V Pappas, SP Parashar, N Park, S Parri, A Patrick, J Pauletta, G Paulini, M Perazzo, A Pescara, L Peters, MD Phillips, TJ Piacentino, G Pillai, M Pitts, KT Plunkett, R Pondrom, L Proudfoot, J Ptohos, F Punzi, G Ragan, K Reher, D Ribon, A Rimondi, F Ristori, L Robertson, WJ Rodrigo, T Rolli, S Romano, J Rosenson, L Roser, R Saab, T Sakumoto, WK Saltzberg, D Sansoni, A Santi, L Sato, H Schlabach, P Schmidt, EE Schmidt, MP Scribano, A Segler, S Seidel, S Seiya, Y Sganos, G Shapiro, MD Shaw, NM Shen, Q Shepard, PF Shimojima, M Shochet, M Siegrist, J Sill, A Sinervo, P Singh, P Skarha, J Sliwa, K Snider, FD Song, T Spalding, J Speer, T Sphicas, P Spinella, F Spiropulu, M Spiegel, L Stanco, L Steele, J Stefanini, A Strahl, K Strait, J Strohmer, R Stuart, D Sullivan, G Sumorok, K Suzuki, J Takada, T Takahashi, T Takano, T Takikawa, K Tamura, N Tannenbaum, B Tartarelli, F Taylor, M Teng, PK Teramoto, Y Tether, S Theriot, D Thomas, TL Thun, R Thurman-Keup, R Timko, M Tipton, P Titov, A Tkaczyk, S Toback, D Tollefson, K Tollestrup, A Toyoda, H Trischuk, W de Troconiz, JF Truitt, S Tseng, J Turini, N Uchida, T Uemura, N Ukegawa, F Unal, G Valls, J van den Brink, SC Vejcik, S Velev, G Vidal, R Vilar, R Vondracek, M Vucinic, D Wagner, RG Wagner, RL Wahl, J Wallace, NB Walsh, AM Wang, C Wang, CH Wang, J Wang, MJ Wang, QF Warburton, A Watts, T Webb, R Wei, C Wenzel, H Wester, WC Wicklund, AB Wicklund, E Wilkinson, R Williams, HH Wilson, P Winer, BL Winn, D Wolinski, D Wolinski, J Worm, S Wu, X Wyss, J Yagil, A Yao, W Yasuoka, K Ye, Y Yeh, GP Yeh, P Yin, M Yoh, J Yosef, C Yoshida, T Yovanovitch, D Yu, I Yu, L Yun, JC Zanetti, A Zetti, F Zhang, L Zhang, W Zucchelli, S CA CDF Collaboration TI Properties of photon plus two-jet events in (p)over-bar-p collisions at root s=1.8 TeV SO PHYSICAL REVIEW D LA English DT Article ID = 1.8 TEV; CROSS-SECTION; P(P)OVER-BAR COLLISIONS; PBARP COLLISIONS; DISTRIBUTIONS; PROTON; 3-JET AB We present the first general measurements (invariant-mass, transverse-energy, and angular distributions) of the process, (p) over bar p-->gamma+2 jets + X, using data collected by the CDF at Fermilab. We compare the data with predictions from a tree-level QCD calculation and the PYTHIA shower Monte Carlo program. Our data sample is particularly sensitive to contributions from initial-and final-state radiation of photons and jets. Using the PYTHIA Monte Carlo program, we contrast the kinematical distributions for direct photon production with those for initial-and final-state photon radiation (bremsstrahlung). Based on the angular distributions, we find that our data favor a mixture of bremsstrahlung and direct photon production, as predicted, over either process alone. [S0556-2821(97)01623-8]. C1 Argonne Natl Lab, Argonne, IL 60439 USA. Univ Bologna, Ist Nazl Fis Nucl, I-40127 Bologna, Italy. Brandeis Univ, Waltham, MA 02264 USA. Univ Calif Los Angeles, Los Angeles, CA 90024 USA. Univ Chicago, Chicago, IL 60638 USA. Duke Univ, Durham, NC 28708 USA. Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. Univ Florida, Gainesville, FL 33611 USA. Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy. Univ Geneva, CH-1211 Geneva 4, Switzerland. Harvard Univ, Cambridge, MA 02138 USA. Hiroshima Univ, Higashihiroshima 724, Japan. Univ Illinois, Urbana, IL 61801 USA. McGill Univ, Inst Particle Phys, Montreal, PQ H3A 2T8, Canada. Univ Toronto, Toronto, ON M5S 1A7, Canada. Johns Hopkins Univ, Baltimore, MD 21218 USA. Univ Karlsruhe, D-76128 Karlsruhe, Germany. Kek Nat Lab High Energy Phys, Tsukuba, Ibaraki 315, Japan. Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. MIT, Cambridge, MA 02139 USA. Univ Michigan, Ann Arbor, MI 48109 USA. Michigan State Univ, E Lansing, MI 48824 USA. Univ New Mexico, Albuquerque, NM 87132 USA. Ohio State Univ, Columbus, OH 43320 USA. Osaka City Univ, Osaka 588, Japan. Univ Padua, Ist Nazl Fis Nucl, Sez Padova, I-36132 Padua, Italy. Univ Penn, Philadelphia, PA 19104 USA. Univ Pisa, Ist Nazl Fis Nucl, I-56100 Pisa, Italy. Scuola Normale Super Pisa, I-56100 Pisa, Italy. Univ Pittsburgh, Pittsburgh, PA 15270 USA. Purdue Univ, W Lafayette, IN 47907 USA. Univ Rochester, Rochester, NY 14628 USA. Rockefeller Univ, New York, NY 10021 USA. Rutgers State Univ, Piscataway, NJ 08854 USA. Acad Sinica, Taipei 11530, Taiwan. Texas A&M Univ, College Stn, TX 77843 USA. Texas Tech Univ, Lubbock, TX 79409 USA. Univ Tsukuba, Tsukuba, Ibaraki 315, Japan. Tufts Univ, Medford, MA 02155 USA. Univ Wisconsin, Madison, WI 53806 USA. Yale Univ, New Haven, CT 06511 USA. RP Abe, F (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. RI Lancaster, Mark/C-1693-2008; Vucinic, Dejan/C-2406-2008; Azzi, Patrizia/H-5404-2012; Punzi, Giovanni/J-4947-2012; Chiarelli, Giorgio/E-8953-2012; Warburton, Andreas/N-8028-2013; Kim, Soo-Bong/B-7061-2014; Paulini, Manfred/N-7794-2014; Introzzi, Gianluca/K-2497-2015; vilar, rocio/D-7454-2014 OI Azzi, Patrizia/0000-0002-3129-828X; Punzi, Giovanni/0000-0002-8346-9052; Chiarelli, Giorgio/0000-0001-9851-4816; Warburton, Andreas/0000-0002-2298-7315; Paulini, Manfred/0000-0002-6714-5787; Introzzi, Gianluca/0000-0002-1314-2580; NR 22 TC 11 Z9 11 U1 0 U2 2 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1550-7998 J9 PHYS REV D JI Phys. Rev. D PD JAN 1 PY 1998 VL 57 IS 1 BP 67 EP 77 DI 10.1103/PhysRevD.57.67 PG 11 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA YP838 UT WOS:000071320700008 ER PT J AU Lampert, MA Molina-Paris, C AF Lampert, MA Molina-Paris, C TI Effective equation of state for a spherically expanding pion plasma SO PHYSICAL REVIEW D LA English DT Article ID DISORIENTED CHIRAL CONDENSATE; PHASE-TRANSITION; RENORMALIZATION; REGULARIZATION; EVOLUTION; EXPANSION; DOMAINS; FIELDS; TIME AB Following a relativistic heavy ion collision, the quark-gluon plasma produced eventually undergoes a chiral phase transition. We assume that during this phase transition one can describe the dynamics of the system by the linear sigma model and that the expansion can be thought of as mostly radial. Because the sigma model is an effective field theory there is an actual momentum cutoff (Landau pole) in the theory at around 1 GeV. Thus it is necessary to find ways of obtaining a covariantly conserved, renormalized energy-momentum tensor when there is a cutoff present (which breaks covariance), in order to identify the effective equation of state of this time evolving System. We show how to solve this technical problem and then determine the energy density and pressure of the system as a function of the proper time. We consider different initial conditions and search for instabilities which can lead to the formation of disoriented chiral condensates. We find that the energy density and pressure both decrease quickly, as is appropriate for a rapidly cooling system, and that the energy is numerically conserved. [S0556-2821(98)04501-9]. C1 Univ New Hampshire, Dept Phys, Durham, NH 03824 USA. Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. RP Lampert, MA (reprint author), Univ New Hampshire, Dept Phys, Durham, NH 03824 USA. NR 24 TC 6 Z9 6 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD JAN 1 PY 1998 VL 57 IS 1 BP 83 EP 92 DI 10.1103/PhysRevD.57.83 PG 10 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA YP838 UT WOS:000071320700010 ER PT J AU Cheng, HC Feng, JL Polonsky, N AF Cheng, HC Feng, JL Polonsky, N TI Signatures of multi-TeV scale particles in supersymmetric theories SO PHYSICAL REVIEW D LA English DT Article ID LINEAR E(+)E(-) COLLIDERS; LARGE HADRON COLLIDER; ELECTROWEAK PARAMETERS; MINIMAL SUPERGRAVITY; TECHNICOLOR THEORIES; BREAKING; MASSES; NATURALNESS; SIGNALS; PHYSICS AB Supersymmetric particles at the multi-TeV scale will escape direct detection at planned future colliders. However, such particles induce non-decoupling corrections in processes involving the accessible superparticles through violations of the supersymmetric equivalence between gauge boson and gaugino couplings. In a previous study, we parametrized these violations in terms of super-oblique parameters and found significant deviations in well-motivated models. Here, we systematically classify the possible experimental probes of such deviations, and present detailed investigations of representative observables available at a future linear collider. In some scenarios, the e(-)e(-) option and adjustable beam energy are exploited to achieve high precision. It is shown that precision measurements are possible for each of the three coupling relations, leading to significant bounds on the masses and properties of heavy superparticles and possible exotic sectors. [S0556-2821(98)05101-7]. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Theoret Phys Grp, Berkeley, CA 94720 USA. Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. Rutgers State Univ, Dept Phys & Astron, Piscataway, NJ 08855 USA. RP Cheng, HC (reprint author), Fermi Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 62 TC 46 Z9 46 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD JAN 1 PY 1998 VL 57 IS 1 BP 152 EP 169 DI 10.1103/PhysRevD.57.152 PG 18 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA YP838 UT WOS:000071320700017 ER PT J AU Baur, U Keller, S Sakumoto, WK AF Baur, U Keller, S Sakumoto, WK TI QED radiative corrections to Z boson production and the forward-backward asymmetry at hadron colliders SO PHYSICAL REVIEW D LA English DT Article ID = 1.8 TEV; LEADING-LOGARITHM CALCULATION; DEEP-INELASTIC-SCATTERING; PARTON DISTRIBUTIONS; W-BOSON; P(P)OVER-BAR COLLISIONS; ELECTROWEAK THEORY; E+E ANNIHILATION; PRECISION TESTS; CROSS-SECTIONS AB The O(alpha) radiative corrections to the process p (sic) --> gamma*, Z-->l(+)l(-) (l = e, mu) are calculated. Factorizing the collinear singularity associated with initial state photon bremsstrahlung into the parton distribution functions, we find that initial state corrections have a much smaller effect than final state radiative corrections. Because of mass singular logarithmic terms associated with photons emitted collinear with one of the final state leptons, QED radiative corrections strongly affect the shape of the di-lepton invariant mass distribution, the lepton transverse momentum spectrum, and the forward-backward asymmetry A(FB). They lead to a sizable shift in the Z boson mass extracted from data, decrease the di-lepton cross section by up to 10%, and increase the integrated forward-backward asymmetry in the Z peak region by about 7% at the Fermilab Tevatron. We also investigate how experimental lepton identification requirements modify the effect of the QED corrections, and study the prospects for a high precision measurement of sin(2) theta(eff)(lept) using the forward-backward asymmetry at the CERN Large Hadron Collider. [S0556-2821(98)03201-9]. C1 SUNY Buffalo, Dept Phys, Buffalo, NY 14260 USA. Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. Univ Rochester, Dept Phys, Rochester, NY 14627 USA. RP Baur, U (reprint author), SUNY Buffalo, Dept Phys, Buffalo, NY 14260 USA. NR 95 TC 85 Z9 85 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1550-7998 EI 1550-2368 J9 PHYS REV D JI Phys. Rev. D PD JAN 1 PY 1998 VL 57 IS 1 BP 199 EP 215 DI 10.1103/PhysRevD.57.199 PG 17 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA YP838 UT WOS:000071320700022 ER PT J AU Buchalla, G Buras, AJ AF Buchalla, G Buras, AJ TI Two-loop large-m(t) electroweak corrections to K ->pi nu(nu)over-bar for an arbitrary Higgs boson mass SO PHYSICAL REVIEW D LA English DT Article ID RARE KAON DECAYS; LEADING LOGARITHMS; HEAVY-TOP; PARTICLES; PHYSICS; ENERGY AB We consider for the first time the leading, large top quark mass corrections, arising at higher order in electroweak interactions, to the rare decays K-->pi nu<(nu)over bar> and the related modes B-->X-s nu<(nu)over bar> and B-->l(+)l(-). Higher order effects of similar type have previously been calculated in the large-m(t) limit for key observables of precision electroweak physics at Z factories. Here we obtain the corresponding corrections of order O(G(F)(2)m(t)(4)) at the amplitude level for short-distance dominated rare meson decays. This allows us to quantify the importance of higher order electroweak effects for these processes, which can be reliably computed and have very small uncertainties from strong interactions. Simultaneously it becomes possible to remove, to some extent, ambiguities in the definition of electroweak parameters describing the strength of flavor-changing neutral current interactions. The corrections we discuss are at the level of a few percent. [S0556-2821(98)02001-3]. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. Tech Univ Munich, Dept Phys, D-85748 Garching, Germany. RP Buchalla, G (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 31 TC 39 Z9 39 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD JAN 1 PY 1998 VL 57 IS 1 BP 216 EP 223 DI 10.1103/PhysRevD.57.216 PG 8 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA YP838 UT WOS:000071320700023 ER PT J AU Gordon, LE AF Gordon, LE TI Prompt photon plus jet photoproduction at DESY HERA at next-to-leading order in QCD SO PHYSICAL REVIEW D LA English DT Article AB The cross section for photoproduction of an isolated prompt photon in association with a jet is studied in next-to-leading order. The kinematics are those appropriate for the DESY ep collider HERA. The effects on the cross section of various experimental cuts including isolation cuts on the photon are examined. Comparisons with the ZEUS preliminary data using two parametrizations of the photon structure function are made, and good agreement is found. The data are not yet precise enough to make a distinction between various models for the photon structure function. [S0556-2821(98)01101-1]. C1 Argonne Natl Lab, Div High Energy Phys, Argonne, IL 60439 USA. RP Gordon, LE (reprint author), Argonne Natl Lab, Div High Energy Phys, Argonne, IL 60439 USA. NR 18 TC 24 Z9 24 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD JAN 1 PY 1998 VL 57 IS 1 BP 235 EP 240 DI 10.1103/PhysRevD.57.235 PG 6 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA YP838 UT WOS:000071320700025 ER PT J AU Brodsky, SJ Ji, CR Pang, A Robertson, DG AF Brodsky, SJ Ji, CR Pang, A Robertson, DG TI Optimal renormalization scale and scheme for exclusive processes SO PHYSICAL REVIEW D LA English DT Article ID PION FORM-FACTOR; PERTURBATIVE QUANTUM CHROMODYNAMICS; COUPLING-CONSTANT; EFFECTIVE CHARGES; QCD ANALYSIS; MASS; Q2; APPLICABILITY; OPTIMIZATION; AMBIGUITY AB We use the Brodsky-Lepage-Mackenzie (BLM) method to fix the renormalization scale of the QCD coupling in exclusive hadronic amplitudes such as the pion form factor and the photon-to-pion transition form factor at large momentum transfer. Renormalization-scheme-independent commensurate scale relations are established which connect the hard scattering subprocess amplitudes that control exclusive processes to other QCD observables such as the heavy quark potential and the electron-positron annihilation cross section. The commensurate scale relation connecting the heavy quark potential, as determined from lattice gauge theory, to the photon-to-pion transition form factor is in excellent agreement with gamma e-->pi(0)e data assuming that the pion distribution amplitude is close to its asymptotic form root 3f(pi)x(1 - x). We also reproduce the scaling and normalization of the gamma gamma-->pi(+)pi(-) data at large momentum transfer. Because the renormalization scale is small, we argue that the effective coupling is nearly constant, thus accounting for the nominal scaling behavior of the data. However, the normalization of the space-like pion form factor F-pi(Q(2)) obtained from electroproduction experiments is somewhat higher than that predicted by the corresponding commensurate scale relation. This discrepancy may be due to systematic errors introduced by the extrapolation of the gamma*p-->pi(+)n electroproduction data to the pion pole. [S0556-2821(98)01801-3]. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. N Carolina State Univ, Dept Phys, Raleigh, NC 27695 USA. Indiana Univ, Ctr Nucl Theory, Bloomington, IN 47404 USA. Ohio State Univ, Dept Phys, Columbus, OH 43210 USA. RP Brodsky, SJ (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RI Ji, Chueng/J-2623-2013 NR 62 TC 100 Z9 100 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD JAN 1 PY 1998 VL 57 IS 1 BP 245 EP 252 DI 10.1103/PhysRevD.57.245 PG 8 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA YP838 UT WOS:000071320700027 ER PT J AU Berger, EL Contopanagos, H AF Berger, EL Contopanagos, H TI Threshold resummation of the total cross section for heavy quark production in hadronic collisions SO PHYSICAL REVIEW D LA English DT Article ID PRINCIPAL-VALUE RESUMMATION; W-GLUON FUSION; TOP-QUARK; QCD CORRECTIONS; Q(Q)OVER-BAR->T(B)OVER-BAR; TEVATRON; SERIES AB We discuss calculations of the inclusive total cross section for heavy quark production at hadron collider energies within the context of perturbative quantum chromodynamics, including resummation of the effects of initial-state soft gluon radiation to all orders in the strong coupling strength. We resum the universal leading logarithm contributions, and we restrict our integrations to the region of phase space that is demonstrably perturbative. We include a detailed comparison of the differences between ours and other methods. We provide predictions of the physical cross section as a function of the heavy quark mass in proton-antiproton reactions at center-of-mass energies of 1.8 and 2.0 TeV, and we discuss the estimated uncertainties. [S0556-2821(98)06001-9]. C1 Argonne Natl Lab, Div High Energy Phys, Argonne, IL 60439 USA. RP Berger, EL (reprint author), Argonne Natl Lab, Div High Energy Phys, Argonne, IL 60439 USA. NR 37 TC 52 Z9 52 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD JAN 1 PY 1998 VL 57 IS 1 BP 253 EP 264 DI 10.1103/PhysRevD.57.253 PG 12 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA YP838 UT WOS:000071320700028 ER PT J AU Chung, SU AF Chung, SU TI General formulation of covariant helicity-coupling amplitudes SO PHYSICAL REVIEW D LA English DT Article AB A general formulation is given for constructing covariant helicity-coupling amplitudes involving two-body decays with arbitrary integer spins. The decay amplitudes are given exclusively in terms of both definite orbital angular momentum and total intrinsic Spin. A systematic method is developed for calculating the energy and momentum dependence of daughter particles in the decay amplitudes, and a general formula for arbitrary integer spins is given. A number of illustrative examples is worked out, among which is that of the Higgs boson decay into two gauge bosons. [S0556-2821(97)03423-1]. C1 Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. RP Chung, SU (reprint author), Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. NR 13 TC 60 Z9 66 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD JAN 1 PY 1998 VL 57 IS 1 BP 431 EP 442 DI 10.1103/PhysRevD.57.431 PG 12 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA YP838 UT WOS:000071320700047 ER PT J AU Oakes, RJ Whisnant, K Yang, JM Young, BL Zhang, X AF Oakes, RJ Whisnant, K Yang, JM Young, BL Zhang, X TI Single top quark production as a probe of R-parity-violating supersymmetry at pp and p(p)over-bar colliders SO PHYSICAL REVIEW D LA English DT Article ID DOUBLE-BETA DECAY; W-GLUON FUSION; STANDARD MODEL; HADRON COLLIDERS; COUPLINGS; CONSTRAINTS; BOUNDS; QCD; Q(Q)OVER-BAR->T(B)OVER-BAR; BOSONS AB We investigate the ability of single top quark production via qq' --> squark --> tb and ' --> slepton --> at the CERN LHC and Fermilab Tevatron to probe the strength of R-parity-violating couplings in the minimal supersymmetric model. We found that given the existing bounds on R-parity-violating couplings, single top quark production may be greatly enhanced over that predicted by the standard model, and that both colliders can either discover R-parity-violating SUSY or set strong constraints on the relevant R-parity-violating couplings. We further found that the LHC is much more powerful than the Tevatron in probing the squark couplings, but the two colliders have comparable sensitivity for the slepton couplings. [S0556-2821(98)01301-0]. C1 Northwestern Univ, Dept Phys & Astron, Evanston, IL 60208 USA. Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA. Acad Sinica, Inst High Energy Phys, Beijing 100039, Peoples R China. Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Oakes, RJ (reprint author), Northwestern Univ, Dept Phys & Astron, Evanston, IL 60208 USA. NR 74 TC 49 Z9 49 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1550-7998 EI 1550-2368 J9 PHYS REV D JI Phys. Rev. D PD JAN 1 PY 1998 VL 57 IS 1 BP 534 EP 540 DI 10.1103/PhysRevD.57.534 PG 7 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA YP838 UT WOS:000071320700057 ER PT J AU Suzuki, M AF Suzuki, M TI Suppressing flavor-changing neutral current interactions from leptoquark exchange by a family symmetry SO PHYSICAL REVIEW D LA English DT Article ID PARITY NONCONSERVATION; CESIUM AB It is shown that the flavor-changing neutral current interaction of leptoquark exchange can be strongly suppressed by a global family symmetry without a numerical fine-tuning of the parameters. In the symmetry limit, if n X n degenerate leptoquarks couple universally to n generations of quarks and leptons in the weak basis, not only is the neutral current interaction flavor diagonal, but also the charged current interaction takes exactly the same form as W exchange at low energies. Neutrino reactions and atomic parity violation still impose tight constraints. A quantitative analysis is made on the stability of flavor diagonalization and family independence against symmetry breaking due to the Higgs-Yukawa coupling. The mechanism is robust against symmetry breaking in the environment of the standard model. [S0556-2821(98)02801-X]. C1 Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Suzuki, M (reprint author), Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. NR 9 TC 2 Z9 2 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD JAN 1 PY 1998 VL 57 IS 1 BP 541 EP 547 DI 10.1103/PhysRevD.57.541 PG 7 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA YP838 UT WOS:000071320700058 ER PT J AU Baltz, AJ Strikman, M AF Baltz, AJ Strikman, M TI Suppression of heavy ion gamma gamma production of the Higgs particle by Coulomb dissociation SO PHYSICAL REVIEW D LA English DT Article ID BOSON PRODUCTION; COLLISIONS; PHYSICS AB The predicted two-photon Higgs production with heavy ions at the CERN LHC is shown to be reduced due to the large Coulomb dissociation cross section. Incorporating the effect of dissociation reduces the production of a 100 GeV Higgs boson by about a factor of three compared to rates in the literature calculated without this effect. [S0556-2821(98)01901-8]. C1 Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. Penn State Univ, Dept Phys, University Pk, PA 16802 USA. RP Baltz, AJ (reprint author), Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. NR 16 TC 8 Z9 8 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD JAN 1 PY 1998 VL 57 IS 1 BP 548 EP 549 DI 10.1103/PhysRevD.57.548 PG 2 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA YP838 UT WOS:000071320700059 ER PT J AU Abachi, S Abbott, B Acharya, BS Adam, I Adams, DL Adams, M Ahn, S Aihara, H Alvarez, G Alves, GA Amidi, E Amos, N Anderson, EW Aronson, SH Astur, R Baarmand, MM Baden, A Balamurali, V Balderston, J Baldin, B Banerjee, S Bantly, J Bartlett, JF Bazizi, K Belyaev, A Bendich, J Beri, SB Bertram, I Bezzubov, VA Bhat, PC Bhatnagar, V Bhattacharjee, M Bischoff, A Biswas, N Blazey, G Blessing, S Bloom, P Boehnlein, A Bojko, NI Borcherding, F Borders, J Boswell, C Brandt, A Brock, R Bross, A Buchholz, D Burtovoi, VS Butler, JM Carvalho, W Casey, D Castilla-Valdez, H Chakraborty, D Chang, SM Chekulaev, SV Chen, LP Chen, W Choi, S Chopra, S Choudhary, BC Christenson, JH Chung, M Claes, D Clark, AR Cobau, WG Cochran, J Cooper, WE Cretsinger, C Cullen-Vidal, D Cummings, MAC Cutts, D Dahl, OI De, K Del Signore, K Demarteau, M Denisov, D Denisov, SP Diehl, HT Diesburg, M Di Loreto, G Draper, P Drinkard, J Ducros, Y Dudko, LV Dugad, SR Edmunds, D Ellison, J Elvira, VD Engelmann, R Eno, S Eppley, G Ermolov, P Eroshin, OV Evdokimov, VN Fahey, S Fahland, T Fatyga, M Fatyga, MK Featherly, J Feher, S Fein, D Ferbel, T Finocchiaro, G Fisk, HE Fisyak, Y Flattum, E Forden, GE Fortner, M Frame, KC Franzini, P Fuess, S Gallas, E Galyaev, AN Gartung, P Geld, TL Genik, RJ Genser, K Gerber, CE Gibbard, B Glebov, V Glenn, S Gobbi, B Goforth, M Goldschmidt, A Gomez, B Gomez, G Goncharov, PI Solis, JLG Gordon, H Goss, LT Goussiou, A Graf, N Grannis, PD Green, DR Green, J Greenlee, H Griffin, G Grim, G Grossman, N Grudberg, P Grunendahl, S Guglielmo, G Guida, JA Guida, JM Guryn, W Gurzhiev, SN Gutierrez, P Gutnikov, YE Hadley, NJ Haggerty, H Hagopian, S Hagopian, V Hahn, KS Hall, RE Hansen, S Hauptman, JM Hedin, D Heinson, AP Heintz, U Hernandez-Montoya, R Heuring, T Hirosky, R Hobbs, JD Hoeneisen, B Hoftun, JS Hsieh, F Hu, T Hu, T Huehn, T Ito, AS James, E Jaques, J Jerger, SA Jesik, R Jiang, JZY Joffe-Minor, T Johns, K Johnson, M Jonckheere, A Jones, M Jostlein, H Jun, SY Jung, CK Kahn, S Kalbfleisch, G Kang, JS Kehoe, R Kelly, ML Kerth, L Kim, CL Kim, SK Klatchko, A Klima, B Klochkov, BI Klopfenstein, C Klyukhin, VI Kochetkov, VI Kohli, JM Koltick, D Kostritskiy, AV Kotcher, J Kotwal, AV Kourlas, J Kozelov, AV Kozlovski, EA Krane, J Krishnaswamy, MR Krzywdzinski, S Kunori, S Lami, S Lan, H Landsberg, G Lauer, B Lebrat, JF Leflat, A Li, H Li, J Li, YK Li-Demarteau, QZ Lima, JGR Lincoln, D Linn, SL Linnemann, J Lipton, R Liu, Q Liu, YC Lobkowicz, F Loken, SC Lokos, S Lueking, L Lyon, AL Maciel, AKA Madaras, RJ Madden, R Magana-Mendoza, L Mani, S Mao, HS Markeloff, R Markosky, L Marshall, T Martin, MI May, B Mayorov, AA McCarthy, R McDonald, J McKibben, T McKinley, J McMahon, T Melanson, HL Merritt, KW Miettinen, H Mincer, A de Miranda, JM Mishra, CS Mokhov, N Mondal, NK Montgomery, HE Mooney, P da Motta, H Mudan, M Murphy, C Nang, F Narain, M Narasimham, VS Narayanan, A Neal, HA Negret, JP Nemethy, P Nesic, D Nicola, M Norman, D Oesch, L Oguri, V Oltman, E Oshima, N Owen, D Padley, P Pang, M Para, A Park, YM Partridge, R Parua, N Paterno, M Perkins, J Peters, M Piegaia, R Piekarz, H Pischalnikov, Y Podstavkov, VM Pope, BG Prosper, HB Protopopescu, S Puseljic, D Qian, J Quintas, PZ Raja, R Rajagopalan, S Ramirez, O Rapidis, PA Rasmussen, L Reucroft, S Rijssenbeek, M Rockwell, T Roe, NA Rubinov, P Ruchti, R Rutherfoord, J Sanchez-Hernandez, A Santoro, A Sawyer, L Schamberger, RD Schellman, H Sculli, J Shabalina, E Shaffer, C Shankar, HC Shivpuri, RK Shupe, M Singh, H Singh, JB Sirotenko, V Smart, W Smith, A Smith, RP Snihur, R Snow, GR Snow, J Snyder, S Solomon, J Sood, PM Sosebee, M Sotnikova, N Souza, M Spadafora, AL Stephens, RW Stevenson, ML Stewart, D Stoianova, DA Stoker, D Streets, K Strovink, M Sznajder, A Tamburello, P Tarazi, J Tartaglia, M Thomas, TLT Thompson, J Trippe, TG Tuts, PM Varelas, N Varnes, EW Vititoe, D Volkov, AA Vorobiev, AP Wahl, HD Wang, G Warchol, J Watts, G Wayne, M Weerts, H White, A White, JT Wightman, JA Willis, S Wimpenny, SJ Wirjawan, JVD Womersley, J Won, E Wood, DR Xu, H Yamada, R Yamin, P Yanagisawa, C Yang, J Yasuda, T Yepes, P Yoshikawa, C Youssef, S Yu, J Yu, Y Zhu, Q Zhu, ZH Zieminska, D Zieminski, A Zverev, EG Zylberstejn, A AF Abachi, S Abbott, B Acharya, BS Adam, I Adams, DL Adams, M Ahn, S Aihara, H Alvarez, G Alves, GA Amidi, E Amos, N Anderson, EW Aronson, SH Astur, R Baarmand, MM Baden, A Balamurali, V Balderston, J Baldin, B Banerjee, S Bantly, J Bartlett, JF Bazizi, K Belyaev, A Bendich, J Beri, SB Bertram, I Bezzubov, VA Bhat, PC Bhatnagar, V Bhattacharjee, M Bischoff, A Biswas, N Blazey, G Blessing, S Bloom, P Boehnlein, A Bojko, NI Borcherding, F Borders, J Boswell, C Brandt, A Brock, R Bross, A Buchholz, D Burtovoi, VS Butler, JM Carvalho, W Casey, D Castilla-Valdez, H Chakraborty, D Chang, SM Chekulaev, SV Chen, LP Chen, W Choi, S Chopra, S Choudhary, BC Christenson, JH Chung, M Claes, D Clark, AR Cobau, WG Cochran, J Cooper, WE Cretsinger, C Cullen-Vidal, D Cummings, MAC Cutts, D Dahl, OI De, K Del Signore, K Demarteau, M Denisov, D Denisov, SP Diehl, HT Diesburg, M Di Loreto, G Draper, P Drinkard, J Ducros, Y Dudko, LV Dugad, SR Edmunds, D Ellison, J Elvira, VD Engelmann, R Eno, S Eppley, G Ermolov, P Eroshin, OV Evdokimov, VN Fahey, S Fahland, T Fatyga, M Fatyga, MK Featherly, J Feher, S Fein, D Ferbel, T Finocchiaro, G Fisk, HE Fisyak, Y Flattum, E Forden, GE Fortner, M Frame, KC Franzini, P Fuess, S Gallas, E Galyaev, AN Gartung, P Geld, TL Genik, RJ Genser, K Gerber, CE Gibbard, B Glebov, V Glenn, S Gobbi, B Goforth, M Goldschmidt, A Gomez, B Gomez, G Goncharov, PI Solis, JLG Gordon, H Goss, LT Goussiou, A Graf, N Grannis, PD Green, DR Green, J Greenlee, H Griffin, G Grim, G Grossman, N Grudberg, P Grunendahl, S Guglielmo, G Guida, JA Guida, JM Guryn, W Gurzhiev, SN Gutierrez, P Gutnikov, YE Hadley, NJ Haggerty, H Hagopian, S Hagopian, V Hahn, KS Hall, RE Hansen, S Hauptman, JM Hedin, D Heinson, AP Heintz, U Hernandez-Montoya, R Heuring, T Hirosky, R Hobbs, JD Hoeneisen, B Hoftun, JS Hsieh, F Hu, T Hu, T Huehn, T Ito, AS James, E Jaques, J Jerger, SA Jesik, R Jiang, JZY Joffe-Minor, T Johns, K Johnson, M Jonckheere, A Jones, M Jostlein, H Jun, SY Jung, CK Kahn, S Kalbfleisch, G Kang, JS Kehoe, R Kelly, ML Kerth, L Kim, CL Kim, SK Klatchko, A Klima, B Klochkov, BI Klopfenstein, C Klyukhin, VI Kochetkov, VI Kohli, JM Koltick, D Kostritskiy, AV Kotcher, J Kotwal, AV Kourlas, J Kozelov, AV Kozlovski, EA Krane, J Krishnaswamy, MR Krzywdzinski, S Kunori, S Lami, S Lan, H Landsberg, G Lauer, B Lebrat, JF Leflat, A Li, H Li, J Li, YK Li-Demarteau, QZ Lima, JGR Lincoln, D Linn, SL Linnemann, J Lipton, R Liu, Q Liu, YC Lobkowicz, F Loken, SC Lokos, S Lueking, L Lyon, AL Maciel, AKA Madaras, RJ Madden, R Magana-Mendoza, L Mani, S Mao, HS Markeloff, R Markosky, L Marshall, T Martin, MI May, B Mayorov, AA McCarthy, R McDonald, J McKibben, T McKinley, J McMahon, T Melanson, HL Merritt, KW Miettinen, H Mincer, A de Miranda, JM Mishra, CS Mokhov, N Mondal, NK Montgomery, HE Mooney, P da Motta, H Mudan, M Murphy, C Nang, F Narain, M Narasimham, VS Narayanan, A Neal, HA Negret, JP Nemethy, P Nesic, D Nicola, M Norman, D Oesch, L Oguri, V Oltman, E Oshima, N Owen, D Padley, P Pang, M Para, A Park, YM Partridge, R Parua, N Paterno, M Perkins, J Peters, M Piegaia, R Piekarz, H Pischalnikov, Y Podstavkov, VM Pope, BG Prosper, HB Protopopescu, S Puseljic, D Qian, J Quintas, PZ Raja, R Rajagopalan, S Ramirez, O Rapidis, PA Rasmussen, L Reucroft, S Rijssenbeek, M Rockwell, T Roe, NA Rubinov, P Ruchti, R Rutherfoord, J Sanchez-Hernandez, A Santoro, A Sawyer, L Schamberger, RD Schellman, H Sculli, J Shabalina, E Shaffer, C Shankar, HC Shivpuri, RK Shupe, M Singh, H Singh, JB Sirotenko, V Smart, W Smith, A Smith, RP Snihur, R Snow, GR Snow, J Snyder, S Solomon, J Sood, PM Sosebee, M Sotnikova, N Souza, M Spadafora, AL Stephens, RW Stevenson, ML Stewart, D Stoianova, DA Stoker, D Streets, K Strovink, M Sznajder, A Tamburello, P Tarazi, J Tartaglia, M Thomas, TLT Thompson, J Trippe, TG Tuts, PM Varelas, N Varnes, EW Vititoe, D Volkov, AA Vorobiev, AP Wahl, HD Wang, G Warchol, J Watts, G Wayne, M Weerts, H White, A White, JT Wightman, JA Willis, S Wimpenny, SJ Wirjawan, JVD Womersley, J Won, E Wood, DR Xu, H Yamada, R Yamin, P Yanagisawa, C Yang, J Yasuda, T Yepes, P Yoshikawa, C Youssef, S Yu, J Yu, Y Zhu, Q Zhu, ZH Zieminska, D Zieminski, A Zverev, EG Zylberstejn, A TI Search for top squark pair production in the dielectron channel SO PHYSICAL REVIEW D LA English DT Article ID SUPERSYMMETRIC PARTICLES; Z0 DECAYS; LEP; DETECTOR; COLLISIONS; CHARGINO; PHYSICS; QUARK AB This report describes the first search for top squark pair production in the channel (t) over tilde(1)(sic)(1) --> <(chi)over tilde>(+)(1)<(chi)over tilde>(+)(1) --> ee + jets +E-T using 74.9+/-8.9 pb(-1) of data collected using the DO detector. A 95% confidence level upper limit on sigma.B is presented. The limit is above the theoretical expectation for sigma.B for this process, but does show the sensitivity of the current DO data set to a particular topology for new physics. [S0556-2821(98)00901]. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. Univ Los Andes, Bogota, Colombia. Univ Arizona, Tucson, AZ 85721 USA. Boston Univ, Boston, MA 02215 USA. Brookhaven Natl Lab, Upton, NY 11973 USA. Brown Univ, Providence, RI 02912 USA. Univ Buenos Aires, Buenos Aires, DF, Argentina. Univ Calif Davis, Davis, CA 95616 USA. Univ Calif Irvine, Irvine, CA 92717 USA. Univ Calif Riverside, Riverside, CA 92521 USA. Ctr Brasileiro Pesquisas Fis, LAFEX, Rio De Janeiro, Brazil. CINVESTAV, Mexico City 14000, DF, Mexico. Columbia Univ, New York, NY 10027 USA. Univ Delhi, Delhi 110007, India. Florida State Univ, Tallahassee, FL 32306 USA. Univ Hawaii, Honolulu, HI 96822 USA. Univ Illinois, Chicago, IL 60607 USA. Indiana Univ, Bloomington, IN 47405 USA. Iowa State Univ, Ames, IA 50011 USA. Korea Univ, Seoul 136701, South Korea. Kyungsung Univ, Pusan 608736, South Korea. Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. Univ Maryland, College Pk, MD 20742 USA. Univ Michigan, Ann Arbor, MI 48109 USA. Michigan State Univ, E Lansing, MI 48824 USA. Moscow State Univ, Moscow, Russia. Univ Nebraska, Lincoln, NE 68588 USA. NYU, New York, NY 10003 USA. Northeastern Univ, Boston, MA 02115 USA. No Illinois Univ, De Kalb, IL 60115 USA. Northwestern Univ, Evanston, IL 60208 USA. Univ Notre Dame, Notre Dame, IN 46556 USA. Univ Oklahoma, Norman, OK 73019 USA. Panjab Univ, Chandigarh 160014, India. Protvino High Energy Phys Inst, Protvino 142284, Russia. Purdue Univ, W Lafayette, IN 47907 USA. Rice Univ, Houston, TX 77005 USA. Univ Estadual Rio De Janeiro, Rio De Janeiro, Brazil. Univ Rochester, Rochester, NY 14627 USA. Ctr Etud Saclay, Serv Phys Particules, DAPNIA, CEA, F-91191 Gif Sur Yvette, France. Seoul Natl Univ, Seoul, South Korea. SUNY Stony Brook, Stony Brook, NY 11794 USA. Tata Inst Fundamental Res, Bombay 400005, Maharashtra, India. Univ Texas, Arlington, TX 76019 USA. Texas A&M Univ, College Stn, TX 77843 USA. RP Abachi, S (reprint author), Fermi Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. RI Belyaev, Alexander/F-6637-2015; Kim, Sun Kee/G-2042-2015; Chekulaev, Sergey/O-1145-2015; Sznajder, Andre/L-1621-2016; Santoro, Alberto/E-7932-2014; Peters, Michael/B-4973-2009; Aihara, Hiroaki/F-3854-2010; Shivpuri, R K/A-5848-2010; Gutierrez, Phillip/C-1161-2011; Roe, Natalie/A-8798-2012; Dudko, Lev/D-7127-2012; Leflat, Alexander/D-7284-2012; Klyukhin, Vyacheslav/D-6850-2012; De, Kaushik/N-1953-2013; Oguri, Vitor/B-5403-2013; Alves, Gilvan/C-4007-2013 OI Hedin, David/0000-0001-9984-215X; Wahl, Horst/0000-0002-1345-0401; Fisyak, Yuri/0000-0002-3151-8377; Landsberg, Greg/0000-0002-4184-9380; Blessing, Susan/0000-0002-4455-7279; Hoeneisen, Bruce/0000-0002-6059-4256; Mincer, Allen/0000-0002-6307-1418; Blazey, Gerald/0000-0002-7435-5758; Jun, Soon Yung/0000-0003-3370-6109; Heinson, Ann/0000-0003-4209-6146; grannis, paul/0000-0003-4692-2142; Belyaev, Alexander/0000-0002-1733-4408; Kim, Sun Kee/0000-0002-0013-0775; Sznajder, Andre/0000-0001-6998-1108; Mooney, Patrick/0000-0002-7866-8284; Baarmand, Marc/0000-0002-9792-8619; Qian, Jianming/0000-0003-4813-8167; Sawyer, Lee/0000-0001-8295-0605; Guglielmo, Gerald/0000-0001-6309-2932; Strovink, Mark/0000-0001-7020-7769; Madaras, Ronald/0000-0001-7399-2993; Lami, Stefano/0000-0001-9492-0147; Aihara, Hiroaki/0000-0002-1907-5964; Dudko, Lev/0000-0002-4462-3192; Klyukhin, Vyacheslav/0000-0002-8577-6531; De, Kaushik/0000-0002-5647-4489; NR 29 TC 15 Z9 15 U1 0 U2 7 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD JAN 1 PY 1998 VL 57 IS 1 BP 589 EP 593 DI 10.1103/PhysRevD.57.589 PG 5 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA YP838 UT WOS:000071320700065 ER PT J AU Hagberg, A Meron, E AF Hagberg, A Meron, E TI Propagation failure in excitable media SO PHYSICAL REVIEW E LA English DT Article ID REACTION-DIFFUSION SYSTEMS; LOCALIZED PATTERNS; TRAVELING WAVES; SPIRAL BREAKUP; INSTABILITIES; TRANSITIONS; TURBULENCE AB We study a mechanism of pulse propagation failure in excitable media where stable traveling pulse solutions appear via a subcritical pitchfork bifurcation. The bifurcation plays a key role in that mechanism. Small perturbations, externally applied or from internal instabilities, may cause pulse propagation failure (wave breakup) provided the system is close enough to the bifurcation point. We derive relations showing how the pitchfork bifurcation is unfolded by weak curvature or advective field perturbations and use them to demonstrate wave breakup. We suggest that the recent observations of wave breakup in the Belousov-Zhabotinsky reaction induced by either an electric field [J.J. Taboada et ah. Chaos 4, 519 (1994)] or a transverse instability [M. Markus, G. Kloss, and I. Kusch, Nature (London) 371, 402 (1994)] are manifestations of this mechanism. C1 Univ Calif Los Alamos Natl Lab, Ctr Nonlinear Studies & T7, Div Theoret, Los Alamos, NM 87545 USA. Ben Gurion Univ Negev, Jacob Blaustein Inst Desert Res, IL-84993 Sede Boqer, Israel. Ben Gurion Univ Negev, Dept Phys, Sede Boker, Israel. RP Hagberg, A (reprint author), Univ Calif Los Alamos Natl Lab, Ctr Nonlinear Studies & T7, Div Theoret, Los Alamos, NM 87545 USA. RI MERON, EHUD/F-1810-2012 NR 26 TC 9 Z9 9 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD JAN PY 1998 VL 57 IS 1 BP 299 EP 303 DI 10.1103/PhysRevE.57.299 PG 5 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA YT413 UT WOS:000071600400040 ER PT J AU Martin, JE Odinek, J Halsey, TC Kamien, R AF Martin, JE Odinek, J Halsey, TC Kamien, R TI Structure and dynamics of electrorheological fluids SO PHYSICAL REVIEW E LA English DT Article ID OSCILLATORY SHEAR; STEADY-SHEAR; SUSPENSIONS; MODEL; AGGREGATION; RHEOLOGY; BEHAVIOR; LIQUIDS; FORCES AB We have used two-dimensional light scattering to study the structure and dynamics of a single-scattering electrorheological fluid in the quiescent state and in steady and oscillatory shear. Studies of the quiescent fluid show that particle columns grow in two stages; Particles first chain along the electric field, causing scattering lobes to appear orthogonal to the field, and then aggregate into columns, causing the scattering lobes to move to smaller angles. Column formation can be understood in terms of a thermal coarsening model we present, whereas the early-time scattering in the direction parallel to the field can be compared to the theory of line liquids. In simple shear the scattering lobes are inclined in the direction of fluid vorticity, in detailed agreement with the independent droplet model of the shear thinning viscosity. In oscillatory shear the orientation of the scattering lobes varies nonsinusoidally. This nonlinear dynamics is described by a kinetic chain model, which provides a theory of the nonlinear shear rheology in arbitrary shear flows. C1 Sandia Natl Labs, Adv Mat Phys Div, Albuquerque, NM 87185 USA. Exxon Res & Engn Co, Annandale, NJ 08801 USA. Univ Penn, Dept Phys, Philadelphia, PA 19104 USA. RP Martin, JE (reprint author), Sandia Natl Labs, Adv Mat Phys Div, POB 5800, Albuquerque, NM 87185 USA. OI Kamien, Randall/0000-0003-1598-5626 NR 35 TC 92 Z9 94 U1 1 U2 10 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD JAN PY 1998 VL 57 IS 1 BP 756 EP 775 DI 10.1103/PhysRevE.57.756 PG 20 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA YT413 UT WOS:000071600400090 ER PT J AU Ferer, M Smith, DH AF Ferer, M Smith, DH TI Continuous behavior in a simple model of the adhesive failure of a layer SO PHYSICAL REVIEW E LA English DT Article ID SELF-ORGANIZED CRITICALITY; CRITICAL-DYNAMICS; RANDOM-MEDIA; HARMONIC-GENERATION; POROUS-MEDIA; CONTACT-LINE; FRACTURE; INTERFACES; INSTABILITIES; DISSIPATION AB A fine-scale model of the removal of an adhesive layer by a uniform stress is described. The initial motivation of this modeling project was a description of the removal of a layer of filter cake from cylindrical filters by back-pulse pressure cleaning. The model includes the bonding forces of adhesion between the layer and a substrate, as well as the forces of cohesion between imaginary "gridblocks" within the layer. For applied stresses (pressures) greater than a threshold value, some of the layer is removed, with the amount of this failure depending upon the pressure as well as the average adhesive and cohesive forces. The cohesive forces reduce and sharpen the threshold because they increase the stress near broken adhesive bonds. We have performed simulations on a variety of sizes, with the largest being 64 000 gridblocks. Our analysis indicates that the regions of failure are compact with a rough boundary whose perimeter fractal dimension is D-p = 1.30 +/- 0.05. In this model, the threshold exhibits the gradual decrease as the system size increases, which is well understood for the general material failure problem in disordered media. Appealing depinning schemes with universal power-law fits of the pressure dependence of the failure rate or the extent of failure are rendered meaningless by the size dependence of the threshold. However, an ad hoc fitting scheme provides a reasonably successful collapse of the failure data to a universal curve. C1 W Virginia Univ, Dept Phys, Morgantown, WV 26506 USA. US DOE, Morgantown Energy Technol Ctr, Morgantown, WV 26507 USA. RP Ferer, M (reprint author), W Virginia Univ, Dept Phys, POB 6315, Morgantown, WV 26506 USA. NR 48 TC 5 Z9 5 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD JAN PY 1998 VL 57 IS 1 BP 866 EP 874 DI 10.1103/PhysRevE.57.866 PG 9 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA YT413 UT WOS:000071600400103 ER PT J AU Glover, TE Crane, JK Perry, MD Lee, RW Falcone, RW AF Glover, TE Crane, JK Perry, MD Lee, RW Falcone, RW TI Time-resolved x-ray emission spectra from optically ionized helium and neon plasmas SO PHYSICAL REVIEW E LA English DT Article ID ABOVE-THRESHOLD IONIZATION; SUBPICOSECOND LASER-PULSES; FIELD-INDUCED IONIZATION; RESIDUAL ENERGY; DRIVEN; RECOMBINATION; EXCITATION; RADIATION; TRANSPORT; GASES AB The interaction of high-power, subpicosecond laser pulses with gas targets is expected to produce highly nonequilibrium plasmas whose parameters are controlled by the laser wavelength and polarization. We investigate such plasmas by measuring time-resolved x-ray-emission spectra in highly ionized helium and neon plasmas produced by high-power optical ionization. Electron temperatures are observed to increase with increasing laser wavelength and with variation of the laser polarization from linear to circular. These results are in qualitative agreement with current models for production of tunnel-ionized laser plasmas. Limited quantitative agreement, however, reflects the complexity of the optical ionization process and suggests the important role rapid cooling processes can play in these plasmas. Emission spectra are combined with time-dependent kinetic simulations to assess prospects for x-ray lasers pumped by rapid electron-ion recombination. C1 Ernest Orlando Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. RP Glover, TE (reprint author), Ernest Orlando Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. NR 46 TC 2 Z9 2 U1 1 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD JAN PY 1998 VL 57 IS 1 BP 982 EP 993 DI 10.1103/PhysRevE.57.982 PG 12 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA YT413 UT WOS:000071600400115 ER PT J AU Cinabro, D Chadha, M Chan, S O'Grady, C Miller, JS Urheim, J Weinstein, AJ Wurthwein, F Prell, S Sivertz, M Sharma, V Asner, DM Eppich, A Gronberg, J Korte, CM Hill, TS Kutschke, R Lange, DJ Morrison, RJ Nelson, HN Nelson, TK Qiao, C Ryd, A Roberts, D Tajima, H Witherell, MS Behrens, BH Ford, WT Alexander, JP Anderson, E Banta, T Billing, M Bloom, K Chapman, S Codner, G Cutler, R Dumas, DJ Eshelman, R Foland, AD Gaidarev, P Giannella, M Greenwald, S Greenwald, Z Hartill, D Henderson, S Hopman, PI Hylas, J Kandaswamy, J Katayama, N Kematick, D Kersevan, R Kreinick, DL Kubik, D Li, Y Liu, W Meller, R Mistry, NB Peterson, D Ormond, K Peck, S Pelaia, T Rice, D Rogers, J Rouse, G Rubin, D Sagan, D Sikora, J Sloand, M Smith, S Soffer, A Sproul, R Swat, J Tan, C Temnykh, S Ward, C Welch, J Young, E Avery, PR Prescott, C Briere, RA Kim, DYJ Yamamoto, H Bergfeld, T Ernst, J Gladding, GE Karliner, I Palmer, M Selen, M Thaler, JJ Janicek, R Richichi, SJ Ross, WR Fast, J Miller, DH Roberts, SE Jessop, CP Lingel, K Artuso, M Jain, V McLean, KW Godang, R AF Cinabro, D Chadha, M Chan, S O'Grady, C Miller, JS Urheim, J Weinstein, AJ Wurthwein, F Prell, S Sivertz, M Sharma, V Asner, DM Eppich, A Gronberg, J Korte, CM Hill, TS Kutschke, R Lange, DJ Morrison, RJ Nelson, HN Nelson, TK Qiao, C Ryd, A Roberts, D Tajima, H Witherell, MS Behrens, BH Ford, WT Alexander, JP Anderson, E Banta, T Billing, M Bloom, K Chapman, S Codner, G Cutler, R Dumas, DJ Eshelman, R Foland, AD Gaidarev, P Giannella, M Greenwald, S Greenwald, Z Hartill, D Henderson, S Hopman, PI Hylas, J Kandaswamy, J Katayama, N Kematick, D Kersevan, R Kreinick, DL Kubik, D Li, Y Liu, W Meller, R Mistry, NB Peterson, D Ormond, K Peck, S Pelaia, T Rice, D Rogers, J Rouse, G Rubin, D Sagan, D Sikora, J Sloand, M Smith, S Soffer, A Sproul, R Swat, J Tan, C Temnykh, S Ward, C Welch, J Young, E Avery, PR Prescott, C Briere, RA Kim, DYJ Yamamoto, H Bergfeld, T Ernst, J Gladding, GE Karliner, I Palmer, M Selen, M Thaler, JJ Janicek, R Richichi, SJ Ross, WR Fast, J Miller, DH Roberts, SE Jessop, CP Lingel, K Artuso, M Jain, V McLean, KW Godang, R TI Observation of the dynamic beta effect at the cornell electron-positron storage ring with the CLEO detector SO PHYSICAL REVIEW E LA English DT Article AB Using the silicon strip detector of the CLEO experiment operating at the Cornell Electron-Positron Storage Ring (CESR), we have observed that the horizontal size of the luminous region decreases in the presence of the beam-beam interaction from what is expected without the beam-beam interaction. The dependence on the bunch current agrees with the prediction of the dynamic beta effect. This is the first direct observation of the effect. C1 Wayne State Univ, Detroit, MI 48202 USA. CALTECH, Pasadena, CA 91125 USA. Univ Calif San Diego, La Jolla, CA 92093 USA. Univ Calif Santa Barbara, Santa Barbara, CA 93106 USA. Univ Colorado, Boulder, CO 80309 USA. Cornell Univ, Ithaca, NY 14853 USA. Univ Florida, Gainesville, FL 32611 USA. Harvard Univ, Cambridge, MA 02138 USA. Univ Illinois, Champaign, IL 61801 USA. McGill Univ, Montreal, PQ H3A 2T8, Canada. Inst Particle Phys, Ottawa, ON K15 5B6, Canada. Univ Oklahoma, Norman, OK 73019 USA. Purdue Univ, W Lafayette, IN 47907 USA. Univ Rochester, Rochester, NY 14627 USA. Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. Syracuse Univ, Syracuse, NY 13244 USA. Vanderbilt Univ, Nashville, TN 37235 USA. Virginia Polytech Inst & State Univ, Blacksburg, VA 24061 USA. RP Cinabro, D (reprint author), Wayne State Univ, Detroit, MI 48202 USA. RI Briere, Roy/N-7819-2014; OI Briere, Roy/0000-0001-5229-1039; Kutschke, Robert/0000-0001-9315-2879; Bloom, Kenneth/0000-0002-4272-8900 NR 9 TC 5 Z9 5 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD JAN PY 1998 VL 57 IS 1 BP 1193 EP 1196 DI 10.1103/PhysRevE.57.1193 PG 4 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA YT413 UT WOS:000071600400145 ER PT J AU He, XY Shan, XW Doolen, GD AF He, XY Shan, XW Doolen, GD TI Discrete Boltzmann equation model for nonideal gases SO PHYSICAL REVIEW E LA English DT Article ID LATTICE; FLUIDS; SIMULATION; FLOWS AB A discrete model based an the Boltzmann equation with a body force and a single relaxation time collision model is derived for simulations of nonideal-gas flow. The interparticle interaction is treated using a mean-field approximation. The Boltzmann equation is discretized in a way that preserves the derivation of the hydrodynamic equations from the Boltzmann equation, using either the Chapman-Enskog method or the Grad 13-moment method. The previously proposed nonideal-gas lattice Boltzmann equation model can be analyzed with rigor. C1 Univ Calif Los Alamos Natl Lab, Ctr Nonlinear Studies, Los Alamos, NM 87545 USA. Univ Calif Los Alamos Natl Lab, Div Theoret, Complex Syst Grp, Los Alamos, NM 87545 USA. Phillips Lab, GPAA, Hanscom AFB, MA 01731 USA. RP He, XY (reprint author), Univ Calif Los Alamos Natl Lab, Ctr Nonlinear Studies, MS-B258, Los Alamos, NM 87545 USA. NR 18 TC 232 Z9 236 U1 8 U2 48 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD JAN PY 1998 VL 57 IS 1 BP R13 EP R16 DI 10.1103/PhysRevE.57.R13 PG 4 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA YT413 UT WOS:000071600400004 ER PT J AU Biino, GG Groning, P AF Biino, GG Groning, P TI Cleavage mechanism and surface chemical characterization of phengitic muscovite and muscovite as constrained by x-ray photoelectron spectroscopy SO PHYSICS AND CHEMISTRY OF MINERALS LA English DT Article ID ATOMIC-FORCE MICROSCOPY; ION-BOMBARDMENT DAMAGE; AUGER-ELECTRON; WESTERN ALPS; XPS; MICA; OXIDATION; MINERALS; SOLIDS; ILLITE AB Freshly cleaved (001) natural muscovite was chemically characterized by X-ray Photoelectron Spectroscopy (XPS). The investigated muscovite crystals have composition ranging from pure end member to phengitic muscovite. XPS provides experimental evidence that the chemical composition of the near-surface region differs from the bulk. This difference is not due to analytical problems, but to extreme surface sensitivity of XPS. Depth profiling was also carried out after tilting of 60 degrees or 70 degrees of the sample along an axis perpendicular to [001]. After tilting of phengitic muscovite, the concentration of Al increases and of K decreases, and therefore Al is the topmost monolayer. Repulsion between the octahedral and tetrahedral sheets, stacking faults or more probably interlayered phases (gibbsite-like) are responsible for the cleavage. Possible perturbations of surface chemistry due to X-ray radiation and Ar+ ion sputtering have also been investigated. X-ray radiation is negligeable, but Ar+ ion sputtering introduces important structural modifications, perturbation of the chemical environment of elements and minor chemical variations. C1 Univ Fribourg, Inst Mineral & Petrog, CH-1700 Fribourg, Switzerland. Univ Calif Berkeley, Lawrence Berkeley Lab, Div Sci Mat, Berkeley, CA 94720 USA. Univ Fribourg, Dept Phys, CH-1700 Fribourg, Switzerland. RP Biino, GG (reprint author), Univ Fribourg, Inst Mineral & Petrog, CH-1700 Fribourg, Switzerland. NR 60 TC 13 Z9 14 U1 1 U2 6 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 USA SN 0342-1791 J9 PHYS CHEM MINER JI Phys. Chem. Miner. PD JAN PY 1998 VL 25 IS 2 BP 168 EP 181 DI 10.1007/s002690050100 PG 14 WC Materials Science, Multidisciplinary; Mineralogy SC Materials Science; Mineralogy GA YW830 UT WOS:000071978300011 ER PT S AU Jones, ED Blount, M Chow, W Hou, H Simmons, JA Kim, Y Schmiedel, T AF Jones, ED Blount, M Chow, W Hou, H Simmons, JA Kim, Y Schmiedel, T BE Osinski, M Blood, P Ishibashi, A TI Bandgap renormalization: GaAs/AlGaAs quantum wells SO PHYSICS AND SIMULATION OF OPTOELECTRONIC DEVICES VI, PTS 1 AND 2 SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT SPIE Conference on Physics and Simulation of Optoelectronic Devices CY JAN 26-30, 1998 CL SAN JOSE, CA SP SPIE DE photoluminescence; quantum wells; bandgap renormalization; many body effects AB Bandgap energy renormalization by many-body interactions has been studied in a series of n-type 8-nm-wide GaAs/AlGaAs single quantum wells using magnetoluminescence spectroscopy at 1.4K and for magnetic fields up to 30T. The 2D-carrier densities varied between 1 and 12 x 10(11) cm(-2). At the maximum 2D-carrier density, the bandgap energy difference between the doped and undoped samples was about 34 meV. C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Jones, ED (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. NR 0 TC 4 Z9 4 U1 2 U2 2 PU SPIE-INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA SN 0277-786X BN 0-8194-2722-5 J9 P SOC PHOTO-OPT INS PY 1998 VL 3283 BP 350 EP 356 DI 10.1117/12.316668 PN 1-2 PG 3 WC Engineering, Electrical & Electronic; Optics; Physics, Applied; Physics, Multidisciplinary SC Engineering; Optics; Physics GA BL42A UT WOS:000075444100035 ER PT S AU Taranenko, NL Tenbrink, SC Hsu, K Miller, CM Bao, YF AF Taranenko, NL Tenbrink, SC Hsu, K Miller, CM Bao, YF BE Osinski, M Blood, P Ishibashi, A TI Using fiber Fabry-Perot tunable filter for high-speed optical packet switching: towards an experimental prototype SO PHYSICS AND SIMULATION OF OPTOELECTRONIC DEVICES VI, PTS 1 AND 2 SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT SPIE Conference on Physics and Simulation of Optoelectronic Devices CY JAN 26-30, 1998 CL SAN JOSE, CA SP SPIE DE fiber Fabry-Perot tunable filters; optical packet switching; wavelength division multiplexing (WDM); all-optical networks; fast clock recovery techniques; Embedded Clock Transport (ECT) AB Merging optical technology with fast packet switching will develop generation-after-next advanced technologies scalable to a Tbit/second. Serious challenge of such an implementation is the lack of an optical switch that would have a fast tuning speed, wide tuning range, low insertion loss, and be highly selective with a narrow passband at the same time. For this purpose we propose using a recent experimental Los Alamos National Laboratory and Micron Optics Co. break through building an optical switch that works three orders of magnitude faster than its commercial predecessors, has a wide tuning range and low insertion loss, and is highly selective. Fast optical tuning in several microseconds is necessary to perform high-speed optical packet switching. One approach to achieve fast wavelength tuning is to use high-speed piezoelectrically-driven Fiber Fabry-Perot tunable filters (FFP-TFs). A special controller has substantially improved the shape of the driving signal and the response of the filter. The fastest switching time achieved without ringing is 3.0 microseconds. At the same time, implementation of high-speed optical packet switching rises the challenge of the bit synchronization of the packets. Conventional circuits are inadequate when a fast clock recovery for the short length packets is required because they need thousands bits to lock on. To deal with it, we propose to implement a bit clock synchronization technique for high-speed packet-switched optical network on a packet-per-packet basis. As the result, a new packet-switched media access control protocol can be designed to minimize the searching time. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Taranenko, NL (reprint author), Univ Calif Los Alamos Natl Lab, CIC-5, Los Alamos, NM 87545 USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU SPIE-INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA SN 0277-786X BN 0-8194-2722-5 J9 P SOC PHOTO-OPT INS PY 1998 VL 3283 BP 883 EP 893 DI 10.1117/12.316641 PN 1-2 PG 3 WC Engineering, Electrical & Electronic; Optics; Physics, Applied; Physics, Multidisciplinary SC Engineering; Optics; Physics GA BL42A UT WOS:000075444100089 ER PT B AU Lamoureux, J AF Lamoureux, J BE Castilla, H Herrera, G Felix, J Sosa, M Fernandez, A Morelos, A TI Recent results in high E-T jet production SO PHYSICS IN COLLISION 16 LA English DT Proceedings Paper CT XVI International Conference on Physics in Collision CY JUN 19-21, 1996 CL MEXICO CITY, MEXICO AB We present results on high E-T jet measurements from CDF and D0. First we show the inclusive jet cross section and compare it to NLO QCD predictions. Preliminary CDF measurements of the Sigma E-T cross section are also shown. In order to place limits on the amount of quark compositness the data can tolerate, we show the dijet angular distributions. Finally, we discuss the inclusive jet cross section measurement at root s = 0.63 TeV and tests of scaling. C1 Fermi Natl Accelerator Lab, CDF Collaborat, Batavia, IL 60510 USA. RP Lamoureux, J (reprint author), Fermi Natl Accelerator Lab, CDF Collaborat, POB 500, Batavia, IL 60510 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA PO BOX 128 FARRER RD, SINGAPORE 9128, SINGAPORE BN 981-02-3027-3 PY 1998 BP 63 EP 79 PG 17 WC Physics, Particles & Fields SC Physics GA BL99V UT WOS:000077401700003 ER PT B AU White, DH AF White, DH BE Castilla, H Herrera, G Felix, J Sosa, M Fernandez, A Morelos, A TI Neutrino oscillations SO PHYSICS IN COLLISION 16 LA English DT Proceedings Paper CT XVI International Conference on Physics in Collision CY JUN 19-21, 1996 CL MEXICO CITY, MEXICO AB A summary of indications for neutrino oscillations is given with special emphasis on the work of the LSND collaboration. A possible explanation of the overall situation is also described. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP White, DH (reprint author), Univ Calif Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA PO BOX 128 FARRER RD, SINGAPORE 9128, SINGAPORE BN 981-02-3027-3 PY 1998 BP 237 EP 254 PG 18 WC Physics, Particles & Fields SC Physics GA BL99V UT WOS:000077401700010 ER PT B AU Derrick, M AF Derrick, M BE Castilla, H Herrera, G Felix, J Sosa, M Fernandez, A Morelos, A TI Diffractive processes SO PHYSICS IN COLLISION 16 LA English DT Proceedings Paper CT XVI International Conference on Physics in Collision CY JUN 19-21, 1996 CL MEXICO CITY, MEXICO AB This paper reviews the present experimental situation in studies of diffractive processes, with particular emphasis on new results coming from the HERA and Tevatron colliders. The interplay between soft and hard processes that characterizes these results provides a challenge for QCD and is providing new insights into the nature of the Pomeron. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Derrick, M (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA PO BOX 128 FARRER RD, SINGAPORE 9128, SINGAPORE BN 981-02-3027-3 PY 1998 BP 341 EP 364 PG 24 WC Physics, Particles & Fields SC Physics GA BL99V UT WOS:000077401700014 ER PT J AU Ivanov, MA Kalinovsky, YL Maris, P Roberts, CD AF Ivanov, MA Kalinovsky, YL Maris, P Roberts, CD TI Semileptonic decays of heavy mesons SO PHYSICS LETTERS B LA English DT Article DE electroweak interactions; semileptonic decays B -> D(D*)lv; Dyson-Schwinger equations; confinement; nonperturbative QCD; quark models ID ISGUR-WISE FUNCTION; BOUND-STATES; MODEL; EQUATIONS; PION AB The semileptonic and leptonic decays of heavy mesons are studied as a phenomenological application and exploration of a heavy-quark limit of Dyson-Schwinger equations. The single form factor, xi(w), which characterises the semileptonic decay in this limit, is calculated and compares well with recent experimental extractions. We obtain a lower bound of 1/3 on the slope-parameter rho(2) = -xi(1), which, in calculations with realistic input, is exceeded by a great deal: agreement with experimental data requiring rho(2) similar to 1.2-1.6. The flavour and momentum dependence of the light-quark propagators has observable consequences. Published by Elsevier Science B.V. C1 Joint Inst Nucl Res, Bogoliubov Lab Theoret Phys, Dubna 141980, Russia. Joint Inst Nucl Res, Lab Comp Tech & Automat, Dubna 141980, Russia. Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA. RP Ivanov, MA (reprint author), Joint Inst Nucl Res, Bogoliubov Lab Theoret Phys, Dubna 141980, Russia. OI Roberts, Craig/0000-0002-2937-1361 NR 21 TC 57 Z9 57 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD JAN 1 PY 1998 VL 416 IS 1-2 BP 29 EP 35 DI 10.1016/S0370-2693(97)01323-3 PG 7 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA YQ831 UT WOS:000071427500005 ER PT J AU Dobrescu, BA Terning, J AF Dobrescu, BA Terning, J TI Negative contributions to S in an effective field theory SO PHYSICS LETTERS B LA English DT Article ID OBLIQUE ELECTROWEAK CORRECTIONS; COLOR ASSISTED TECHNICOLOR; TOP-QUARK COUPLINGS; EXTENDED TECHNICOLOR; GAUGE BOSONS; PHYSICS; MODEL; BREAKING; LIMITS; CONSTRAINTS AB We show that an effective field theory that includes non-standard couplings between the electroweak gauge bosons and the top and bottom quarks may yield negative contributions to both the S and T oblique radiative electroweak parameters. a We find that that such an effective field theory provides a better fit to data than the standard model (the chi(2) per degree of freedom is half as large). We examine in some detail an illustrative model where the exchange of heavy scalars produces the correct type of non-standard couplings. (C) 1998 Elsevier Science B.V. C1 Boston Univ, Dept Phys, Boston, MA 02215 USA. Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA. RP Dobrescu, BA (reprint author), Fermilab Natl Accelerator Lab, Dept Theoret Phys, POB 500,MS106, Batavia, IL 60510 USA. EM dobrescu@budoe.bu.edu; terning@alvin.lbl.gov OI Terning, John/0000-0003-1367-0575 NR 39 TC 18 Z9 18 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD JAN 1 PY 1998 VL 416 IS 1-2 BP 129 EP 136 DI 10.1016/S0370-2693(97)01304-X PG 8 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA YQ831 UT WOS:000071427500019 ER PT J AU Mrenna, S Yuan, CP AF Mrenna, S Yuan, CP TI Effects of QCD resummation on W(+)h and t(b)over-bar production at the Tevatron SO PHYSICS LETTERS B LA English DT Article ID TOP-QUARK PRODUCTION; HADRON-COLLISIONS; BOSON PRODUCTION; VECTOR BOSONS; BACK JETS; HIGGS; Q(Q)OVER-BAR->T(B)OVER-BAR; COLLIDERS; ORDER; DECAY AB The resummation of multiple soft gluon emission affects the kinematic distributions of W(+)h (where h is a Higgs boson) and <(tb)over bar> pairs at hadron colliders. Using the Collins-Soper-Sterman resummation formalism, various kinematic distributions of the individual final state particles and the pair are calculated for the W(+)h process, with a Higgs boson mass between 80-120 GeV, and the <(tb)over bar> process, with m(t) between 170-180 GeV. We also estimate part of the higher order (beyond next-to-leading order) effect to their production rates. (C) 1998 Elsevier Science B.V. C1 Argonne Natl Lab, Div High Energy Phys, Argonne, IL 60439 USA. Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA. RP Mrenna, S (reprint author), Argonne Natl Lab, Div High Energy Phys, Argonne, IL 60439 USA. NR 24 TC 49 Z9 49 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD JAN 1 PY 1998 VL 416 IS 1-2 BP 200 EP 207 DI 10.1016/S0370-2693(97)01303-8 PG 8 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA YQ831 UT WOS:000071427500029 ER PT J AU Acciarri, M Adriani, O Aguilar-Benitez, M Ahlen, S Alcaraz, J Alemanni, G Allaby, J Aloisio, A Alverson, G Alviggi, MG Ambrosi, G Anderhub, H Andreev, VP Angelescu, T Anselmo, F Arefiev, A Azemoon, T Aziz, T Bagnaia, P Baksay, L Ball, RC Banerjee, S Banerjee, S Banicz, K Barczyk, A Barillere, R Becattini, F Becker, U Behner, F Berdugo, J Berges, P Bertucci, B Betev, BL Bhattacharya, S Biasini, M Biland, A Bilei, GM Blaising, JJ Blyth, SC Bobbink, GJ Bock, R Bohm, A Boldizsar, L Borgia, B Bourilkov, D Bourquin, M Boutigny, D Braccini, S Branson, JG Brigljevic, V Brock, IC Buffini, A Buijs, A Burger, JD Burger, WJ Busenitz, J Cai, XD Campanelli, M Capell, M Romeo, GC Carlino, G Cartacci, AM Casaus, J Castellini, G Cavallari, F Cavallo, N Cecchi, C Cerrada, M Cesaroni, F Chamizo, M Chang, YH Chaturvedi, UK Chekanov, SV Chemarin, M Chen, A Chen, G Chen, GM Chen, HF Chen, HS Chen, M Chiefari, G Chien, CY Cifarelli, L Cindolo, F Civinini, C Clare, I Clare, R Cohn, HO Coignet, G Colijn, AP Colino, N Costantini, S Cotorobai, F de la Cruz, B Csilling, A Dai, TS D'Alessandro, R de Asmundis, R Degre, A Deiters, K Denes, P DeNotaristefani, F DiBitonto, D Diemoz, M van Dierendonck, D Di Lodovico, F Dionisi, C Dittmar, M Dominguez, A Doria, A Dova, MT Drago, E Duchesneau, D Duinker, P Duran, I Dutta, S Easo, S Efremenko, Y El Mamouni, H Engler, A Eppling, FJ Erne, FC Ernenwein, JP Extermann, P Fabre, M Faccini, R Falciano, S Favara, A Fay, J Fedin, O Felcini, M Fenyi, B Ferguson, T Fernandez, D Ferroni, F Fesefeldt, H Fiandrini, E Field, JH Filthaut, F Fisher, PH Fisk, I Forconi, G Fredj, L Freudenreich, K Furetta, C Galaktionov, Y Ganguli, SN Garcia-Abia, P Gau, SS Gentile, S Gerald, J Gheordanescu, N Giagu, S Goldfarb, S Goldstein, J Gong, ZF Gougas, A Gratta, G Gruenewald, MW Gupta, VK Gurtu, A Gutay, LJ Hartmann, B Hasan, A Hatzifotiadou, D Hebbeker, T Herve, A van Hoek, WC Hofer, H Hong, SJ Hoorani, H Hou, SR Hu, G Innocente, V Jenkes, K Jin, BN Jones, LW de Jong, P Josa-Mutuberria, I Kasser, A Khan, RA Kamrad, D Kamyshkov, Y Kapustinsky, JS Karyotakis, Y Kaur, M Kienzle-Focacci, MN Kim, D Kim, DH Kim, JK Kim, SC Kim, YG Kinnison, WW Kirkby, A Kirkby, D Kirkby, J Kiss, D Kittel, W Klimentov, A Konig, AC Kopp, A Korolko, I Koutsenko, V Kraemer, RW Krenz, W Kunin, A Lacentre, P de Guevara, PL Landi, G Lapoint, C Lassila-Perini, K Laurikainen, P Lebeau, M Lebedev, A Lebrun, P Lecomte, P Lecoq, P Le Coultre, P Lee, HJ Leggett, C Le Goff, JM Leiste, R Leonardi, E Levtchenko, P Li, C Lin, CH Lin, WT Linde, FL Lista, L Liu, ZA Lohmann, W Longo, E Lu, W Lu, YS Lubelsmeyer, K Luci, C Luckey, D Luminari, L Lustermann, W Ma, WG Maity, M Majumder, G Malgeri, L Malinin, A Mana, C Mangeol, D Mangla, S Marchesini, P Marin, A Martin, JP Marzano, F Massaro, GGG McNally, D Mele, S Merola, L Meschini, M Metzger, WJ von der Mey, M Mi, Y Mihul, A van Mil, AJW Milcent, H Mirabelli, G Mnich, J Molnar, P Monteleoni, B Moore, R Morganti, S Moulik, T Mount, R Muheim, F Muijs, AJM Nahn, S Napolitano, M Nessi-Tedaldi, F Newman, H Niessen, T Nippe, A Nisati, A Nowak, H Oh, YD Opitz, H Organtini, G Ostonen, R Palomares, C Pandoulas, D Paoletti, S Paolucci, P Park, HK Park, IH Pascale, G Passaleva, G Patricelli, S Paul, T Pauluzzi, M Paus, C Pauss, F Peach, D Pei, YJ Pensotti, S Perret-Gallix, D Petersen, B Petrak, S Pevsner, A Piccolo, D Pieri, M Piroue, PA Pistolesi, E Plyaskin, V Pohl, M Pojidaev, V Postema, H Produit, N Prokofiev, D Rahal-Callot, G Raja, N Rancoita, PG Rattaggi, M Raven, G Razis, P Read, K Ren, D Rescigno, M Reucroft, S van Rhee, T Riemann, S Riles, K Rind, O Robohm, A Rodin, J Roe, BP Romero, L Rosier-Lees, S Rosselet, P van Rossum, W Roth, S Rubio, JA Ruschmeier, D Rykaczewski, H Salicio, J Sanchez, E Sanders, MP Sarakinos, ME Sarkar, S Sauvage, G Schafer, C Schegelsky, V Schmidt-Kaerst, S Schmitz, D Schneegans, M Scholz, N Schopper, H Schotanus, DJ Schwenke, J Schwering, G Sciacca, C Sciarrino, D Servoli, L Shevchenko, S Shivarov, N Shoutko, V Shukla, J Shumilov, E Shvorob, A Siedenburg, T Son, D Soulimov, V Smith, B Spillantini, P Steuer, M Stickland, DP Stone, H Stoyanov, B Straessner, A Strauch, K Sudhakar, K Sultanov, G Sun, LZ Susinno, GF Suter, H Swain, JD Tang, XW Tauscher, L Taylor, L Ting, SCC Ting, SM Tonwar, SC Toth, J Tully, C Tuchscherer, H Tung, KL Uchida, Y Ulbricht, J Uwer, U Valente, E Van de Walle, RT Vesztergombi, G Vetlitsky, I Viertel, G Vivargent, M Volkert, R Vogel, H Vogt, H Vorobiev, I Vorobyov, AA Vorvolakos, A Wadhwa, M Wallraff, W Wang, JC Wang, XL Wang, ZM Weber, A Wu, SX Wynhoff, S Xu, J Xu, ZZ Yang, BZ Yang, CG Yao, XY Ye, JB Yeh, SC You, JM Zalite, A Zalite, Y Zemp, P Zeng, Y Zhang, Z Zhang, ZP Zhou, B Zhou, Y Zhu, GY Zhu, RY Zichichi, A Ziegler, F AF Acciarri, M Adriani, O Aguilar-Benitez, M Ahlen, S Alcaraz, J Alemanni, G Allaby, J Aloisio, A Alverson, G Alviggi, MG Ambrosi, G Anderhub, H Andreev, VP Angelescu, T Anselmo, F Arefiev, A Azemoon, T Aziz, T Bagnaia, P Baksay, L Ball, RC Banerjee, S Banerjee, S Banicz, K Barczyk, A Barillere, R Becattini, F Becker, U Behner, F Berdugo, J Berges, P Bertucci, B Betev, BL Bhattacharya, S Biasini, M Biland, A Bilei, GM Blaising, JJ Blyth, SC Bobbink, GJ Bock, R Bohm, A Boldizsar, L Borgia, B Bourilkov, D Bourquin, M Boutigny, D Braccini, S Branson, JG Brigljevic, V Brock, IC Buffini, A Buijs, A Burger, JD Burger, WJ Busenitz, J Cai, XD Campanelli, M Capell, M Romeo, GC Carlino, G Cartacci, AM Casaus, J Castellini, G Cavallari, F Cavallo, N Cecchi, C Cerrada, M Cesaroni, F Chamizo, M Chang, YH Chaturvedi, UK Chekanov, SV Chemarin, M Chen, A Chen, G Chen, GM Chen, HF Chen, HS Chen, M Chiefari, G Chien, CY Cifarelli, L Cindolo, F Civinini, C Clare, I Clare, R Cohn, HO Coignet, G Colijn, AP Colino, N Costantini, S Cotorobai, F de la Cruz, B Csilling, A Dai, TS D'Alessandro, R de Asmundis, R Degre, A Deiters, K Denes, P DeNotaristefani, F DiBitonto, D Diemoz, M van Dierendonck, D Di Lodovico, F Dionisi, C Dittmar, M Dominguez, A Doria, A Dova, MT Drago, E Duchesneau, D Duinker, P Duran, I Dutta, S Easo, S Efremenko, Y El Mamouni, H Engler, A Eppling, FJ Erne, FC Ernenwein, JP Extermann, P Fabre, M Faccini, R Falciano, S Favara, A Fay, J Fedin, O Felcini, M Fenyi, B Ferguson, T Fernandez, D Ferroni, F Fesefeldt, H Fiandrini, E Field, JH Filthaut, F Fisher, PH Fisk, I Forconi, G Fredj, L Freudenreich, K Furetta, C Galaktionov, Y Ganguli, SN Garcia-Abia, P Gau, SS Gentile, S Gerald, J Gheordanescu, N Giagu, S Goldfarb, S Goldstein, J Gong, ZF Gougas, A Gratta, G Gruenewald, MW Gupta, VK Gurtu, A Gutay, LJ Hartmann, B Hasan, A Hatzifotiadou, D Hebbeker, T Herve, A van Hoek, WC Hofer, H Hong, SJ Hoorani, H Hou, SR Hu, G Innocente, V Jenkes, K Jin, BN Jones, LW de Jong, P Josa-Mutuberria, I Kasser, A Khan, RA Kamrad, D Kamyshkov, Y Kapustinsky, JS Karyotakis, Y Kaur, M Kienzle-Focacci, MN Kim, D Kim, DH Kim, JK Kim, SC Kim, YG Kinnison, WW Kirkby, A Kirkby, D Kirkby, J Kiss, D Kittel, W Klimentov, A Konig, AC Kopp, A Korolko, I Koutsenko, V Kraemer, RW Krenz, W Kunin, A Lacentre, P de Guevara, PL Landi, G Lapoint, C Lassila-Perini, K Laurikainen, P Lebeau, M Lebedev, A Lebrun, P Lecomte, P Lecoq, P Le Coultre, P Lee, HJ Leggett, C Le Goff, JM Leiste, R Leonardi, E Levtchenko, P Li, C Lin, CH Lin, WT Linde, FL Lista, L Liu, ZA Lohmann, W Longo, E Lu, W Lu, YS Lubelsmeyer, K Luci, C Luckey, D Luminari, L Lustermann, W Ma, WG Maity, M Majumder, G Malgeri, L Malinin, A Mana, C Mangeol, D Mangla, S Marchesini, P Marin, A Martin, JP Marzano, F Massaro, GGG McNally, D Mele, S Merola, L Meschini, M Metzger, WJ von der Mey, M Mi, Y Mihul, A van Mil, AJW Milcent, H Mirabelli, G Mnich, J Molnar, P Monteleoni, B Moore, R Morganti, S Moulik, T Mount, R Muheim, F Muijs, AJM Nahn, S Napolitano, M Nessi-Tedaldi, F Newman, H Niessen, T Nippe, A Nisati, A Nowak, H Oh, YD Opitz, H Organtini, G Ostonen, R Palomares, C Pandoulas, D Paoletti, S Paolucci, P Park, HK Park, IH Pascale, G Passaleva, G Patricelli, S Paul, T Pauluzzi, M Paus, C Pauss, F Peach, D Pei, YJ Pensotti, S Perret-Gallix, D Petersen, B Petrak, S Pevsner, A Piccolo, D Pieri, M Piroue, PA Pistolesi, E Plyaskin, V Pohl, M Pojidaev, V Postema, H Produit, N Prokofiev, D Rahal-Callot, G Raja, N Rancoita, PG Rattaggi, M Raven, G Razis, P Read, K Ren, D Rescigno, M Reucroft, S van Rhee, T Riemann, S Riles, K Rind, O Robohm, A Rodin, J Roe, BP Romero, L Rosier-Lees, S Rosselet, P van Rossum, W Roth, S Rubio, JA Ruschmeier, D Rykaczewski, H Salicio, J Sanchez, E Sanders, MP Sarakinos, ME Sarkar, S Sauvage, G Schafer, C Schegelsky, V Schmidt-Kaerst, S Schmitz, D Schneegans, M Scholz, N Schopper, H Schotanus, DJ Schwenke, J Schwering, G Sciacca, C Sciarrino, D Servoli, L Shevchenko, S Shivarov, N Shoutko, V Shukla, J Shumilov, E Shvorob, A Siedenburg, T Son, D Soulimov, V Smith, B Spillantini, P Steuer, M Stickland, DP Stone, H Stoyanov, B Straessner, A Strauch, K Sudhakar, K Sultanov, G Sun, LZ Susinno, GF Suter, H Swain, JD Tang, XW Tauscher, L Taylor, L Ting, SCC Ting, SM Tonwar, SC Toth, J Tully, C Tuchscherer, H Tung, KL Uchida, Y Ulbricht, J Uwer, U Valente, E Van de Walle, RT Vesztergombi, G Vetlitsky, I Viertel, G Vivargent, M Volkert, R Vogel, H Vogt, H Vorobiev, I Vorobyov, AA Vorvolakos, A Wadhwa, M Wallraff, W Wang, JC Wang, XL Wang, ZM Weber, A Wu, SX Wynhoff, S Xu, J Xu, ZZ Yang, BZ Yang, CG Yao, XY Ye, JB Yeh, SC You, JM Zalite, A Zalite, Y Zemp, P Zeng, Y Zhang, Z Zhang, ZP Zhou, B Zhou, Y Zhu, GY Zhu, RY Zichichi, A Ziegler, F CA L3 Collaborat TI Measurement of the average lifetime of b-hadrons in Z decays SO PHYSICS LETTERS B LA English DT Article ID LUND MONTE-CARLO; HEAVY QUARKS; PRECISION-MEASUREMENT; JET FRAGMENTATION; E+E ANNIHILATION; L3 EXPERIMENT; PARTICLES; PHYSICS AB We present a measurement of the average b-hadron lifetime tau(b) at the e(+)e(-) collider LEP. Using hadronic Z decays collected in the period from 1991 to 1994, two independent analyses have been performed. In the first one, the b-decay position is reconstructed as a secondary vertex of hadronic b-decay particles. The second analysis is an updated measurement of tau(b) using the impact parameter of leptons with high momentum and high transverse momentum. The combined result is tau(b) = [1549 +/- 9 (stat) +/- 15 (syst)] fs. In addition, we measure the average charged b-decay multiplicity [n(b)] and the normalized average b-energy [x(E)](b) at LEP to be [n(b)] = 4.90 +/- 0.04 (stat) +/- 0.11 (syst), [x(E)](b) = 0.709 +/- 0.004 (stat + syst). (C) 1998 Published by Elsevier Science B.V. C1 Rhein Westfal TH Aachen, Inst Phys 3, D-52056 Aachen, Germany. Univ Amsterdam, NL-1009 DB Amsterdam, Netherlands. NIKHEF H, Natl Inst High Energy Phys, NL-1009 DB Amsterdam, Netherlands. Univ Michigan, Ann Arbor, MI 48109 USA. Lab Annecy Le Vieux Phys Particules, LAPP, IN2P3, CNRS, F-74941 Annecy Le Vieux, France. Johns Hopkins Univ, Baltimore, MD 21218 USA. Univ Basel, Inst Phys, CH-4056 Basel, Switzerland. Inst High Energy Phys, Beijing 100039, Peoples R China. Humboldt Univ, D-10099 Berlin, Germany. Univ Bologna, I-40126 Bologna, Italy. Ist Nazl Fis Nucl, Sez Bologna, I-40126 Bologna, Italy. Tata Inst Fundamental Res, Bombay 400005, Maharashtra, India. Boston Univ, Boston, MA 02215 USA. Northeastern Univ, Boston, MA 02115 USA. Inst Atom Phys, R-76900 Bucharest, Romania. Univ Bucharest, R-76900 Bucharest, Romania. Hungarian Acad Sci, Cent Res Inst Phys, H-1525 Budapest 114, Hungary. Harvard Univ, Cambridge, MA 02139 USA. MIT, Cambridge, MA 02139 USA. Ist Nazl Fis Nucl, Sez Firenze, I-50125 Florence, Italy. Univ Florence, I-50125 Florence, Italy. CERN, European Lab Particle Phys, CH-1211 Geneva 23, Switzerland. World Lab, FBLJA Project, CH-1211 Geneva 23, Switzerland. Univ Geneva, CH-1211 Geneva 23, Switzerland. Univ Sci & Technol China, Hefei 230029, Peoples R China. SEFT, Res Inst High Energy Phys, SF-00014 Helsinki, Finland. Univ Lausanne, CH-1015 Lausanne, Switzerland. Ist Nazl Fis Nucl, Sez Lecce, I-73100 Lecce, Italy. Univ Lecce, I-73100 Lecce, Italy. Los Alamos Natl Lab, Los Alamos, NM 87544 USA. Univ Lyon 1, Inst Phys Nucl Lyon, IN2P3, CNRS, F-69622 Villeurbanne, France. CIEMAT, E-28040 Madrid, Spain. Ist Nazl Fis Nucl, Sez Milano, I-20133 Milan, Italy. Inst Theoret & Expt Phys, Moscow 117259, Russia. Ist Nazl Fis Nucl, Sez Napoli, I-80125 Naples, Italy. Univ Naples Federico II, I-80125 Naples, Italy. Univ Cyprus, Dept Nat Sci, Nicosia, Cyprus. Univ Nijmegen, NL-6525 ED Nijmegen, Netherlands. Natl Inst Nucl Phys & High Energy Phys, NL-6525 ED Nijmegen, Netherlands. Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. CALTECH, Pasadena, CA 91125 USA. Ist Nazl Fis Nucl, Sez Perugia, I-06100 Perugia, Italy. Ist Nazl Fis Nucl, Univ Perugia, I-06100 Perugia, Italy. Carnegie Mellon Univ, Pittsburgh, PA 15213 USA. Princeton Univ, Princeton, NJ 08544 USA. Ist Nazl Fis Nucl, Sez Roma, I-00185 Rome, Italy. Univ Roma La Sapienza, I-00185 Rome, Italy. Inst Nucl Phys, St Petersburg, Russia. Univ Salerno, I-84100 Salerno, Italy. Ist Nazl Fis Nucl, I-84100 Salerno, Italy. Univ Calif San Diego, San Diego, CA 92103 USA. Univ Santiago, Dept Fis Particulas Elementales, E-15706 Santiago De Compostela, Spain. Bulgarian Acad Sci, Cent Lab Mechatron & Instrumentat, BU-1113 Sofia, Bulgaria. Korea Adv Inst Sci & Technol, Ctr High Energy Phys, Taejon 305701, South Korea. Univ Alabama, Tuscaloosa, AL 35486 USA. Univ Utrecht, NL-3584 CB Utrecht, Netherlands. NIKHEF H, NL-3584 CB Utrecht, Netherlands. Purdue Univ, W Lafayette, IN 47907 USA. Paul Scherrer Inst, CH-5232 Villigen, Switzerland. DESY, Inst Hochenergiephys, D-15738 Zeuthen, Germany. Swiss Fed Inst Technol, CH-8093 Zurich, Switzerland. Univ Hamburg, D-22761 Hamburg, Germany. High Energy Phys Grp, Taipei, Taiwan. Rhein Westfal TH Aachen, Inst Phys 1, D-52056 Aachen, Germany. RP Acciarri, M (reprint author), Rhein Westfal TH Aachen, Inst Phys 1, D-52056 Aachen, Germany. RI Lista, Luca/C-5719-2008; Kirkby, Jasper/A-4973-2012; Servoli, Leonello/E-6766-2012; bertucci, bruna/J-5237-2012; Cavallo, Nicola/F-8913-2012; Cerrada, Marcos/J-6934-2014; Josa, Isabel/K-5184-2014; de la Cruz, Begona/K-7552-2014; Vogel, Helmut/N-8882-2014; Ferguson, Thomas/O-3444-2014; Berdugo, Javier/A-2858-2015; D'Alessandro, Raffaello/F-5897-2015; Fiandrini, Emanuele/C-4549-2008; Sanchez, Eusebio/H-5228-2015; Duran, Ignacio/H-7254-2015; Rancoita, Pier Giorgio/J-9896-2015; Hoorani, Hafeez/D-1791-2013; Palomares, Carmen/H-7783-2015; Fedin, Oleg/H-6753-2016; Roth, Stefan/J-2757-2016; Kamyshkov, Yuri/J-7999-2016; Di Lodovico, Francesca/L-9109-2016; OI Kirkby, Jasper/0000-0003-2341-9069; Servoli, Leonello/0000-0003-1725-9185; Cerrada, Marcos/0000-0003-0112-1691; Vogel, Helmut/0000-0002-6109-3023; Ferguson, Thomas/0000-0001-5822-3731; Berdugo, Javier/0000-0002-7911-8532; D'Alessandro, Raffaello/0000-0001-7997-0306; Castellini, Guido/0000-0002-0177-0643; Read, Kenneth/0000-0002-3358-7667; Diemoz, Marcella/0000-0002-3810-8530; Doria, Alessandra/0000-0002-5381-2649; Sciacca, Crisostomo/0000-0002-8412-4072; Faccini, Riccardo/0000-0003-2613-5141; Bertucci, Bruna/0000-0001-7584-293X; Filthaut, Frank/0000-0003-3338-2247; Sanchez, Eusebio/0000-0002-9646-8198; Rancoita, Pier Giorgio/0000-0002-1990-4283; Palomares, Carmen/0000-0003-4374-9065; Roth, Stefan/0000-0003-3616-2223; Kamyshkov, Yuri/0000-0002-3789-7152; Di Lodovico, Francesca/0000-0003-3952-2175; Longo, Egidio/0000-0001-6238-6787; Ambrosi, Giovanni/0000-0001-6977-9559; Goldstein, Joel/0000-0003-1591-6014 NR 33 TC 9 Z9 9 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 EI 1873-2445 J9 PHYS LETT B JI Phys. Lett. B PD JAN 1 PY 1998 VL 416 IS 1-2 BP 220 EP 232 DI 10.1016/S0370-2693(97)01379-8 PG 13 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA YQ831 UT WOS:000071427500032 ER PT S AU Winske, D Murillo, MS Rosenberg, M AF Winske, D Murillo, MS Rosenberg, M BE Horanyi, M Robertson, S Walch, B TI Simulation of dust-acoustic waves SO PHYSICS OF DUSTY PLASMAS: SEVENTH WORKSHOP SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT 7th Workshop on the Physics of Dusty Plasmas CY APR, 1998 CL BOULDER, CO AB We use molecular dynamics (MD) and particle-in-cell (PIC) simulation methods to investigate the dispersion relation of dust-acoustic waves in a one-dimensional, strongly coupled (Coulomb coupling parameter = Gamma = ratio of the Coulomb energy to the thermal energy = 120) dusty plasma. We study both cases where the dust is represented by a small number of simulation particles that form into a regular array structure (crystal limit) as well as where the dust is represented by a much larger number of particles (fluid limit). C1 Univ Calif Los Alamos Natl Lab, Div Appl Theoret Phys, Los Alamos, NM 87545 USA. Univ Calif San Diego, Dept Elect & Comp Engn, La Jolla, CA 92093 USA. RP Winske, D (reprint author), Univ Calif Los Alamos Natl Lab, Div Appl Theoret Phys, Los Alamos, NM 87545 USA. NR 0 TC 3 Z9 3 U1 0 U2 2 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0094-243X BN 1-56396-809-6 J9 AIP CONF PROC PY 1998 VL 446 BP 101 EP 110 PG 10 WC Astronomy & Astrophysics; Physics, Applied; Physics, Fluids & Plasmas SC Astronomy & Astrophysics; Physics GA BM12X UT WOS:000077726800012 ER PT S AU Murillo, MS Rosenberg, M AF Murillo, MS Rosenberg, M BE Horanyi, M Robertson, S Walch, B TI Waves in dusty plasma crystals with dipole interactions SO PHYSICS OF DUSTY PLASMAS: SEVENTH WORKSHOP SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT 7th Workshop on the Physics of Dusty Plasmas CY APR, 1998 CL BOULDER, CO AB Nonsymmetrical effective interactions between dust grains in dusty plasmas can arise from a variety of mechanisms such as nonuniform charging, ion focusing and wakes, and induced grain polarization. These effects can be included by describing the total effective interaction in terms of its first two multipoles: the monopole term which corresponds to the usual screened Coulomb interaction, and the dipole term which can be either attractive or repulsive depending on the relative orientation between grains. We consider dust waves propagating along the dipole axis in such a system (in its crystalline phase) and dispersion relations are presented. C1 Univ Calif Los Alamos Natl Lab, Appl Theoret & Comutat Phys Div, Los Alamos, NM 87545 USA. Univ Calif San Diego, Dept Elect & Comp Engn, La Jolla, CA 92093 USA. RP Murillo, MS (reprint author), Univ Calif Los Alamos Natl Lab, Appl Theoret & Comutat Phys Div, POB 1663, Los Alamos, NM 87545 USA. NR 0 TC 1 Z9 1 U1 0 U2 1 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0094-243X BN 1-56396-809-6 J9 AIP CONF PROC PY 1998 VL 446 BP 131 EP 134 PG 4 WC Astronomy & Astrophysics; Physics, Applied; Physics, Fluids & Plasmas SC Astronomy & Astrophysics; Physics GA BM12X UT WOS:000077726800015 ER PT S AU Hammerberg, JE Holian, BL Murillo, MS Winske, D AF Hammerberg, JE Holian, BL Murillo, MS Winske, D BE Horanyi, M Robertson, S Walch, B TI Molecular dynamics simulations of dipolar dusty plasmas SO PHYSICS OF DUSTY PLASMAS: SEVENTH WORKSHOP SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT 7th Workshop on the Physics of Dusty Plasmas CY APR, 1998 CL BOULDER, CO AB We use molecular dynamics (MD) simulation methods to investigate dusty plasma crystal structure in an external potential, with the grains subject to both a spherically symmetric Debye-Huckel potential and a cylindrically symmetric dipole interaction. The dipole contribution models the experimentally important effects of ion flour or intrinsic grain polarization. We find that the addition of a small dipole term changes the crystal structure from bet to one in which the grains are aligned vertically, consistent with experiments as well as recent theoretical calculations. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Hammerberg, JE (reprint author), Univ Calif Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. NR 0 TC 6 Z9 6 U1 0 U2 1 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0094-243X BN 1-56396-809-6 J9 AIP CONF PROC PY 1998 VL 446 BP 257 EP 264 PG 8 WC Astronomy & Astrophysics; Physics, Applied; Physics, Fluids & Plasmas SC Astronomy & Astrophysics; Physics GA BM12X UT WOS:000077726800029 ER PT J AU Concus, P Finn, R AF Concus, P Finn, R TI Discontinuous behavior of liquids between parallel and tilted plates SO PHYSICS OF FLUIDS LA English DT Article ID SURFACES AB Discontinuous behavior of liquids between parallel and tilted plates in the absence of gravity is discussed. A principal finding, derived mathematically from the classical Young-Laplace-Gauss formulation for capillary free surfaces, is that in a large range of configurations liquid bridges between parallel plates are unstable with respect to small, even infinitesimal, tilting of one of the plates. Under a computationally based hypothesis of uniqueness of spherical bridges in a wedge, it is shown that the same discontinuous behavior prevails for all but very particular circumstances. The various liquid configurations, which form the basis for an experiment on board the Space Station Mir, are characterized and illustrated. (C) 1998 American Institute of Physics. C1 Lawrence Berkeley Lab, Berkeley, CA 94720 USA. Univ Calif Berkeley, Berkeley, CA 94720 USA. Stanford Univ, Stanford, CA 94305 USA. RP Concus, P (reprint author), Lawrence Berkeley Lab, Berkeley, CA 94720 USA. NR 16 TC 37 Z9 37 U1 1 U2 8 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 USA SN 1070-6631 J9 PHYS FLUIDS JI Phys. Fluids PD JAN PY 1998 VL 10 IS 1 BP 39 EP 43 DI 10.1063/1.869547 PG 5 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA YM737 UT WOS:000071095800006 ER PT J AU Chen, HD Chen, SY AF Chen, HD Chen, SY TI Kinematic effects on local energy dissipation rate and local enstrophy in fluid turbulence SO PHYSICS OF FLUIDS LA English DT Article ID 3-DIMENSIONAL TURBULENCE; INTERMITTENCY AB A simple analysis shows that for incompressible isotropic turbulence there exists a generic inequality between the energy dissipation rate and enstrophy whenever the moment correlations of the velocity field is quasi-normal, This indicates that the cause of the difference of spatial fluctuations between the two quantities is at least in part kinematic. (C) 1998 American Institute of Physics. C1 Exa Corp, Lexington, MA 02165 USA. IBM Corp, Thomas J Watson Res Ctr, Yorktown Heights, NY 10598 USA. Univ Calif Los Alamos Natl Lab, Ctr Nonlinear Studies, Los Alamos, NM 87545 USA. Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA. RP Chen, HD (reprint author), Exa Corp, 450 Bedford St, Lexington, MA 02165 USA. RI Chen, Shiyi/A-3234-2010 NR 14 TC 4 Z9 4 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 USA SN 1070-6631 J9 PHYS FLUIDS JI Phys. Fluids PD JAN PY 1998 VL 10 IS 1 BP 312 EP 314 DI 10.1063/1.869568 PG 3 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA YM737 UT WOS:000071095800028 ER PT S AU Beuville, E Cahn, R Cederstrom, B Danielsson, M Hasegawa, B Lundqvist, M Hall, A Luo, L Nygren, D Oltman, E AF Beuville, E Cahn, R Cederstrom, B Danielsson, M Hasegawa, B Lundqvist, M Hall, A Luo, L Nygren, D Oltman, E BE Dobbins, JT Boone, JM TI High resolution scanned-slit x-ray imaging using a refractive lens for x-ray focusing SO PHYSICS OF MEDICAL IMAGING SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT SPIE Conference on Physics of Medical Imaging CY FEB, 1998 CL SAN DIEGO, CA SP SPIE DE mammography; photon-counting; scanned-slit; x-ray focusing; x-ray lens; ASIC for x-ray imaging AB We are developing a slit-scanning digital mammography system with the goal of reducing radiation dose and improving dynamic range in comparison to conventional film-screen mammography. The system is based on a linear silicon detector connected to a fast parallel processing ASIC controlled from a PC. The detector system is configured fi om a silicon wafer such that the X-rays enter the wafer edge-on, resulting in a high efficiency over the entire range of diagnostic X-ray energies since the absorption length of the detector can be made large. An evaluation of the system gives an MTF close to that predicted theoretically for a 100-mu m-pitch pixel detector. We also propose to reduce tube-loading in the slit-scanning system with a refractive X-ray lens that can increase the incident photon flux by about 5-fold according to ray tracing simulations. Moreover the lens shapes the energy spectrum to obtain a pseudo-monochromatic beam thus enhancing contrast sensitivity, for example in mammography. We estimate a scan time with the final system of the order of a few seconds for a full-field digital mammogram. Phantom images of microcalcifications and of tumor-like masses, and an initial evaluation of a scanned-slit photon-counting X-ray imaging system, are presented. C1 Lawrence Berkeley Lab, Berkeley, CA 94707 USA. RP Danielsson, M (reprint author), Lawrence Berkeley Lab, Berkeley, CA 94707 USA. NR 0 TC 3 Z9 3 U1 0 U2 0 PU SPIE-INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA SN 0277-786X BN 0-8194-2781-0 J9 P SOC PHOTO-OPT INS PY 1998 VL 3336 BP 95 EP 103 DI 10.1117/12.317007 PG 9 WC Engineering, Biomedical; Optics; Physics, Applied; Radiology, Nuclear Medicine & Medical Imaging SC Engineering; Optics; Physics; Radiology, Nuclear Medicine & Medical Imaging GA BL54B UT WOS:000075819800010 ER PT S AU Hanson, KM AF Hanson, KM BE Dobbins, JT Boone, JM TI A simplified method of estimating noise power spectra SO PHYSICS OF MEDICAL IMAGING SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT SPIE Conference on Physics of Medical Imaging CY FEB, 1998 CL SAN DIEGO, CA SP SPIE DE noise power spectrum; Wiener spectrum; granularity; pass-band granularity; Laplacian; binomial kernels; Gaussian pyramid; Laplacian pyramid AB A technique to estimate the radial dependence of the noise power spectrum of images is proposed in which the calculations are conducted solely in the spatial domain of the noise image. The noise power spectrum averaged over a radial spatial-frequency interval is obtained from the variance of a noise image that has been convolved with a small kernel that approximates a Laplacian operator. Recursive consolidation of the image by factors of two in each dimension yields estimates of the noise power spectrum over that full range of spatial frequencies. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Hanson, KM (reprint author), Univ Calif Los Alamos Natl Lab, MS P940, Los Alamos, NM 87545 USA. NR 0 TC 4 Z9 4 U1 0 U2 1 PU SPIE-INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA SN 0277-786X BN 0-8194-2781-0 J9 P SOC PHOTO-OPT INS PY 1998 VL 3336 BP 243 EP 250 DI 10.1117/12.317023 PG 8 WC Engineering, Biomedical; Optics; Physics, Applied; Radiology, Nuclear Medicine & Medical Imaging SC Engineering; Optics; Physics; Radiology, Nuclear Medicine & Medical Imaging GA BL54B UT WOS:000075819800025 ER PT J AU Ryutov, D Toor, A AF Ryutov, D Toor, A TI Enhanced thermal dissipation and the Rayleigh-Taylor instability in emulsion-like media SO PHYSICS OF PLASMAS LA English DT Article AB Rayleigh-Taylor instability in a finely structured emulsion-like medium consisting of the two components of different compressibility is considered. Although the term "emulsion" is used to describe the structure of the medium, under typical conditions of pulsed fusion devices the medium is actually a plasma. The two components are chosen in such a way that their densities in the unperturbed state are approximately equal. Specific emphasis has been made on the analysis of perturbations with the scale <(lambda)over bar> considerably exceeding the size of the grains alpha. Average equations describing such perturbations are derived. The difference in compressibility of the two components leads to the formation of temperature variations at the scale alpha, and increases the rate of the thermal dissipation by a factor (<(lambda)over bar>/alpha)(2). The strongest stabilizing effect of the thermal dissipation takes place when the heat conduction time is comparable with the instability growth rate. (C) 1998 American Institute of Physics. C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. RP Ryutov, D (reprint author), Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. NR 13 TC 8 Z9 8 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 USA SN 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD JAN PY 1998 VL 5 IS 1 BP 22 EP 35 DI 10.1063/1.872672 PG 14 WC Physics, Fluids & Plasmas SC Physics GA YR556 UT WOS:000071507100005 ER PT J AU Brizard, AJ Morehead, JJ Kaufman, AN Tracy, ER AF Brizard, AJ Morehead, JJ Kaufman, AN Tracy, ER TI Double-crossing mode conversion in nonuniform media SO PHYSICS OF PLASMAS LA English DT Article ID LINEAR-CONVERSION; FORMULATION; ENERGY AB A new type of mode conversion between two linear waves in a nonuniform medium is investigated. Single-crossing conversion occurs when a ray of one wave crosses transversely the dispersion manifold of another wave. Double-crossing mode conversion theory describes when the ray punctures the dispersion manifold twice due to ray curvature. To study this new process, a one dimensionally nonuniform background medium is considered, which gives rise to four scenarios. These scenarios are distinguished on the basis of whether the two waves have equal or opposite energy signs, and whether they are copropagating or counterpropagating. Using modular-eikonal theory (suitable for multiple crossings), each scenario is first studied analytically by constructing an S-matrix relation between the outgoing and incoming asymptotic wave amplitudes. The analytical results are then compared with numerical results and excellent agreement is found. (C) 1998 American Institute of Physics. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. Coll William & Mary, Dept Phys, Williamsburg, VA 23185 USA. RP Brizard, AJ (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. OI Brizard, Alain/0000-0002-0192-6273 NR 14 TC 12 Z9 12 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 USA SN 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD JAN PY 1998 VL 5 IS 1 BP 45 EP 59 DI 10.1063/1.872674 PG 15 WC Physics, Fluids & Plasmas SC Physics GA YR556 UT WOS:000071507100007 ER PT J AU Ware, AS Terry, PW Carreras, BA Diamond, PH AF Ware, AS Terry, PW Carreras, BA Diamond, PH TI Turbulent heat and particle flux response to electric field shear SO PHYSICS OF PLASMAS LA English DT Article ID GRADIENT-DRIVEN TURBULENCE; REVERSED MAGNETIC SHEAR; CONFINEMENT; TFTR; MODE AB Turbulent heat and particle fluxes are shown to have different responses to ExB shear flow in edge plasmas. Recent work has shown that ExB shear can affect the cross phase between electrostatic potential and pressure fluctuations as well as fluctuation levels, thus affecting the heat and particle fluxes. Resistive pressure gradient driven turbulence (RPGDT) is considered including a collisional electron temperature equation. While the particle flux is sensitive to moderate amounts of shear in the radial electric field, the heat flux is insensitive to moderate shear. In the collisional regime, the difference in the sensitivity of the heat and particle fluxes to ExB shear is due to the large parallel heat conductivity. The large parallel heat conductivity dominates the temperature response to electrostatic perturbations. In lower collisionality regimes, the difference in the dissipation rates between density and temperature is negligible, but other effects can still produce different responses in the heat and particle fluxes. (C) 1998 American Institute of Physics. C1 Univ Montana, Dept Phys & Astron, Missoula, MT 59801 USA. Univ Wisconsin, Dept Phys, Madison, WI 53712 USA. Oak Ridge Natl Lab, Div Fus Energy, Oak Ridge, TN 37831 USA. Univ Calif San Diego, Dept Phys, La Jolla, CA 92093 USA. RP Ware, AS (reprint author), Univ Montana, Dept Phys & Astron, Missoula, MT 59801 USA. NR 14 TC 28 Z9 28 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 USA SN 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD JAN PY 1998 VL 5 IS 1 BP 173 EP 177 DI 10.1063/1.872685 PG 5 WC Physics, Fluids & Plasmas SC Physics GA YR556 UT WOS:000071507100022 ER PT J AU Mason, RJ Kopp, RA Vu, HX Wilson, DC Goldman, SR Watt, RG Dunne, M Willi, O AF Mason, RJ Kopp, RA Vu, HX Wilson, DC Goldman, SR Watt, RG Dunne, M Willi, O TI Computational study of laser imprint mitigation in foam-buffered inertial confinement fusion targets SO PHYSICS OF PLASMAS LA English DT Article ID RAYLEIGH-TAYLOR INSTABILITY; INDUCED SPATIAL INCOHERENCE; IRRADIATED TARGETS; DRIVEN; BURN; BEAM; PLASMAS; NONUNIFORMITY; HYDRODYNAMICS; ILLUMINATION AB Recent experiments have shown that low density foam layers can significantly mitigate the perturbing effects of beam nonuniformities affecting the acceleration of thin shells. This problem is studied parametrically with two-dimensional LASNEX [G. B. Zimmerman and W. L. Kruer, Comments Plasma Phys. Controlled Fusion 2, 51 (1975)]. Foam-buffered targets are employed, consisting typically of 250 Angstrom of gold, and 50 mu m of 50 mg/cm(3) C10H8O4 foam attached to a 10 mu m foil. In simulation these were characteristically exposed to 1.2 ns, flat-topped green light pulses at 1.4 x 10(14) W/cm(2) intensity, bearing 30 mu m lateral perturbations of up to 60% variation in intensity. Without the buffer layers the foils were severely disrupted by 1 ns. With buffering only minimal distortion was manifest at 3 ns. The smoothing is shown to derive principally from the high thermal conductivity of the heated foam. The simulation results imply that (1) the foam thickness should exceed the disturbance wavelength; (2) intensities exceeding 5 x 10(13) W/cm(2) are needed for assured stability beyond 2 ns; (3) longer foams at lower densities are needed for effective mitigation with shorter wavelength light; (4) the gold layer hastens conversion of the structured foam to a uniform plasma. (C) 1998 American Institute of Physics. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. Atom Weap Estab, Reading RG7 4PR, Berks, England. Univ London Imperial Coll Sci Technol & Med, Blackett Lab, London SW7 2BZ, England. RP Mason, RJ (reprint author), Univ Calif Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. RI Dunne, Mike/B-4318-2014 OI Dunne, Mike/0000-0001-8740-3870 NR 56 TC 22 Z9 22 U1 0 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 USA SN 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD JAN PY 1998 VL 5 IS 1 BP 211 EP 221 DI 10.1063/1.872690 PG 11 WC Physics, Fluids & Plasmas SC Physics GA YR556 UT WOS:000071507100027 ER PT J AU Wolfrum, E Wark, J Zhang, J Kalantar, D Key, MH Remington, BA Weber, SV Neely, D Rose, S Warwick, J MacPhee, A Lewis, CLS Demir, A Lin, J Smith, R Tallents, GJ AF Wolfrum, E Wark, J Zhang, J Kalantar, D Key, MH Remington, BA Weber, SV Neely, D Rose, S Warwick, J MacPhee, A Lewis, CLS Demir, A Lin, J Smith, R Tallents, GJ TI Measurement of single mode imprint in laser ablative drive of a thin Al foil by extreme ultraviolet laser radiography SO PHYSICS OF PLASMAS LA English DT Article ID RAYLEIGH-TAYLOR INSTABILITY; X-RAY LASER; SI FOIL; GROWTH; PLASMA; IRRADIATION; TARGETS; NOVA AB The temporal development of laser driven single mode perturbations in thin A1 foils has been measured using extreme ultraviolet (XUV) laser radiography. 15, 30, 70 and 90 mu m single modes were imprinted on 2 mu m thick A1 foils with an optical driver laser at 527 nm for intensities in the range 5 x 10(12) to 1.5 x 10(13) W cm(-2). The magnitude of the imprinted perturbation at the time of shock break out was determined by fitting to the data estimated curves of growth of the Rayleigh-Taylor instability after shock break out. The efficiency of imprinting is independent of perturbation wavelength in the parameter range of this experiment, suggesting little influence of thermal conduction smoothing. The results are of interest for directly driven inertially confined fusion. (C) 1998 American Institute of Physics. C1 Univ Oxford, Clarendon Lab, Oxford OX1 3PU, England. Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. Rutherford Appleton Lab, Cent Laser Facil, Didcot OX11 0QX, Oxon, England. Queens Univ Belfast, Sch Math & Phys, Belfast BT7 1NN, Antrim, North Ireland. Univ Essex, Dept Phys, Colchester CO4 3SQ, Essex, England. RP Wolfrum, E (reprint author), Univ Oxford, Clarendon Lab, Parks Rd, Oxford OX1 3PU, England. RI Zhang, Jie/O-8767-2014; OI Rose, Steven/0000-0001-6808-6355 NR 29 TC 27 Z9 27 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 USA SN 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD JAN PY 1998 VL 5 IS 1 BP 227 EP 233 DI 10.1063/1.872691 PG 7 WC Physics, Fluids & Plasmas SC Physics GA YR556 UT WOS:000071507100029 ER PT J AU Labaune, C Baldis, HA Bauer, BS Tikhonchuk, VT Laval, G AF Labaune, C Baldis, HA Bauer, BS Tikhonchuk, VT Laval, G TI Time-resolved measurements of secondary Langmuir waves produced by the Langmuir decay instability in a laser-produced plasma SO PHYSICS OF PLASMAS LA English DT Article ID STIMULATED RAMAN-SCATTERING; ION-ACOUSTIC-WAVES; RANDOM-PHASE PLATE; THOMSON SCATTERING; BRILLOUIN-SCATTERING; HOT-SPOTS; SATURATION; TURBULENCE; FLUCTUATIONS; LIGHT AB Direct observations of secondary Langmuir waves produced by the parametric decay instability of primary Langmuir waves are presented. The measurements have been obtained using Thomson scattering of a short-wavelength probe laser beam and are resolved in time, space, frequency, and wave number. The primary Langmuir waves were driven by stimulated Raman scattering (SRS) of a smoothed laser beam in a preformed plasma. Measurements of the amplitude of the density fluctuations associated with primary and secondary Langmuir waves show that the threshold of the Langmuir decay instability (LDI) is close to the threshold of the Raman instability. This is in agreement with theoretical predictions. However, the ratio of amplitudes of the density fluctuations associated with both secondary and primary Langmuir waves does not agree with existing theories of SRS saturation due to LDI cascading and/or strong Langmuir turbulence in homogeneous plasmas. An explanation based on the interaction beam intensity distribution produced by the random phase plate in the plasma is discussed. (C) 1998 American Institute of Physics. C1 Ecole Polytech, CNRS, Lab Utilisat Lasers Intenses, F-91128 Palaiseau, France. Ecole Polytech, CNRS, Ctr Phys Theor, F-91128 Palaiseau, France. Univ Calif Lawrence Livermore Natl Lab, Inst Laser Sci & Applicat, Livermore, CA 94550 USA. RP Labaune, C (reprint author), Ecole Polytech, CNRS, Lab Utilisat Lasers Intenses, F-91128 Palaiseau, France. NR 38 TC 39 Z9 39 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 USA SN 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD JAN PY 1998 VL 5 IS 1 BP 234 EP 242 DI 10.1063/1.872692 PG 9 WC Physics, Fluids & Plasmas SC Physics GA YR556 UT WOS:000071507100030 ER PT J AU Davidson, RC Lee, WWL Stoltz, P AF Davidson, RC Lee, WWL Stoltz, P TI Statistically averaged rate equations for intense non-neutral beam propagation through a periodic solenoidal focusing field based on the nonlinear Vlasov-Maxwell equations SO PHYSICS OF PLASMAS LA English DT Article ID ION-BEAM; PARTICLE BEAMS AB In this paper we present a detailed formulation and analysis of the rate equations for statistically averaged quantities for an intense non-neutral beam propagating through a periodic solenoidal focusing field B-sol(x) with axial periodicity length S = const. The analysis is based on the nonlinear Vlasov-Maxwell equations in the electrostatic approximation, assuming a thin beam with characteristic beam radius r(b) much less than S, and small transverse momentum and axial momentum spread in comparison with the directed axial momentum p(z) = gamma(b) beta(b)c. The global rate equation is derived for the self-consistent nonlinear evolution of the statistical average [X] = N(b)(-1)integral dXdYdX'dY'chi F-b, where chi(X,Y,X',Y',s) is a general phase function, and F-b(X,Y,X',Y',s) is the distribution function of the beam particles in the transverse phase space (X,Y,X',Y') appropriate to the Larmor frame. The results are applied to investigate the nonlinear evolution of the generalized entropy, mean canonical angular momentum [P-theta], center-of-mass motion for [X] and [Y], mean kinetic energy (1/2)[X'(2)+ Y'(2)], mean-square beam radius (X-2 + Y-2), and coupled rate equations for the unnormalized transverse emittance epsilon(s) and root-mean-square beam radius R-b(s)=[X-2 + Y-2](1/2). Most importantly, the present derivation of nonlinear rate equations for various statistical averages [chi] allows for general azimuthal variation (partial derivative/partial derivative theta not equal 0) of the distribution function and self-field potential, and therefore represents a major generalization of earlier calculations carried out for the case of axisymmetric beam propagation. (C) 1998 American Institute of Physics. C1 Princeton Univ, Plasma Phys Lab, Princeton, NJ 08543 USA. RP Davidson, RC (reprint author), Princeton Univ, Plasma Phys Lab, POB 451, Princeton, NJ 08543 USA. NR 30 TC 27 Z9 27 U1 1 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 USA SN 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD JAN PY 1998 VL 5 IS 1 BP 279 EP 291 DI 10.1063/1.872708 PG 13 WC Physics, Fluids & Plasmas SC Physics GA YR556 UT WOS:000071507100037 ER PT S AU Geer, S AF Geer, S BE Cline, DB TI Workshop on physics at the first muon collider and front-end of a muon collider: A brief summary SO PHYSICS POTENTIAL AND DEVELOPMENT OF MU+MU- COLLIDERS SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT 4th International Conference on Physics Potential and Development of mu+mu- Colliders CY DEC, 1997 CL SAN FRANCISCO, CA SP US DOE AB In November 1997 a workshop was held at Fermilab to explore the physics potential of the first muon collider, and the physics potential of the accelerator complex at the "front-end" of the collider. An extensive physics program emerged from the workshop. This paper attempts to summarize this physics program and identify the main conclusions from the workshop. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Geer, S (reprint author), Fermi Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0094-243X BN 1-56396-723-5 J9 AIP CONF PROC PY 1998 VL 441 BP 18 EP 30 PG 13 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BL93A UT WOS:000077174700002 ER PT S AU Quigg, C AF Quigg, C BE Cline, DB TI The top quark and Higgs boson at hadron colliders SO PHYSICS POTENTIAL AND DEVELOPMENT OF MU+MU- COLLIDERS SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT 4th International Conference on Physics Potential and Development of mu+mu- Colliders CY DEC, 1997 CL SAN FRANCISCO, CA SP US DOE AB To provide context for discussions of experiments at future muon colliders, I survey what is known and what will be known about the top quark and the Higgs boson from experiments at hadron colliders. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Quigg, C (reprint author), Fermi Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0094-243X BN 1-56396-723-5 J9 AIP CONF PROC PY 1998 VL 441 BP 57 EP 71 PG 15 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BL93A UT WOS:000077174700005 ER PT S AU Parke, S AF Parke, S BE Cline, DB TI Top quark physics at a polarized Muon Collider SO PHYSICS POTENTIAL AND DEVELOPMENT OF MU+MU- COLLIDERS SE AIP Conference Proceedings LA English DT Proceedings Paper CT 4th International Conference on Physics Potential and Development of mu+mu- Colliders CY DEC, 1997 CL SAN FRANCISCO, CA SP US DOE AB Top quark pair production is presented at a polarized Muon Collider above the threshold region. The off-diagonal spin basis is the natural basis for this discussion as the top quark pairs are produced in an essentially unique spin configuration for 100% polarization. Modest polarization, say 30%, can lead to 90% of all top quark pair events being in one spin configuration. This will lead to sensitive tests on anomalous top quark couplings. C1 Fermilab Natl Accelerator Lab, Dept Theoret Phys, Batavia, IL 60510 USA. RP Fermilab Natl Accelerator Lab, Dept Theoret Phys, POB 500, Batavia, IL 60510 USA. EM parke@fnal.gov NR 0 TC 1 Z9 1 U1 1 U2 2 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0094-243X BN 1-56396-723-5 J9 AIP CONF PROC PY 1998 VL 441 BP 72 EP 78 DI 10.1117/12.327989 PG 7 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BL93A UT WOS:000077174700006 ER PT S AU Feng, JL AF Feng, JL BE Cline, DB TI R-parity violation and sneutrino resonances at muon colliders SO PHYSICS POTENTIAL AND DEVELOPMENT OF MU+MU- COLLIDERS SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT 4th International Conference on Physics Potential and Development of mu+mu- Colliders CY DEC, 1997 CL SAN FRANCISCO, CA SP US DOE AB In supersymmetric models with R-parity; violation, sneutrinos may be produced as s-channel resonances at mu(+)mu(-) colliders. We demonstrate that, for R-parity violating couplings as ion; as 10(-4), sneutrino resonances may be observed and may; be exploited to yield high precision SUSY parameter measurements. The excellent beam energy resolution of muon colliders may also be used to resolve MeV level splittings between CP-even and CP-odd sneutrino mass eigenstates. C1 Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Theoret Phys Grp, Berkeley, CA 94720 USA. RP Feng, JL (reprint author), Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Theoret Phys Grp, Berkeley, CA 94720 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0094-243X BN 1-56396-723-5 J9 AIP CONF PROC PY 1998 VL 441 BP 92 EP 97 PG 6 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BL93A UT WOS:000077174700009 ER PT S AU Lykken, JD AF Lykken, JD BE Cline, DB TI Sparticle masses from kinematic fitting at a muon collider SO PHYSICS POTENTIAL AND DEVELOPMENT OF MU+MU- COLLIDERS SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT 4th International Conference on Physics Potential and Development of mu+mu- Colliders CY DEC, 1997 CL SAN FRANCISCO, CA SP US DOE AB Three case studies are presented of slepton pair production followed by two-body or quasi-two-body decays at a muon collider. Precision mass measurements are possible using a variety of kinematic fitting methods. Standard Model and supersymmetric backgrounds are easily controlled by kinematic cuts. In all three cases it appears that detector resolutions, not backgrounds or statistics, will dominate the final error bars. C1 Fermi Natl Accelerator Lab, Dept Theoret Phys, Batavia, IL 60510 USA. RP Lykken, JD (reprint author), Fermi Natl Accelerator Lab, Dept Theoret Phys, POB 500, Batavia, IL 60510 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0094-243X BN 1-56396-723-5 J9 AIP CONF PROC PY 1998 VL 441 BP 106 EP 115 PG 10 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BL93A UT WOS:000077174700011 ER PT S AU King, BJ AF King, BJ BE Cline, DB TI Neutrino physics at muon colliders SO PHYSICS POTENTIAL AND DEVELOPMENT OF MU+MU- COLLIDERS SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT 4th International Conference on Physics Potential and Development of mu+mu- Colliders CY DEC, 1997 CL SAN FRANCISCO, CA SP US DOE C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP King, BJ (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0094-243X BN 1-56396-723-5 J9 AIP CONF PROC PY 1998 VL 441 BP 132 EP 139 PG 8 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BL93A UT WOS:000077174700014 ER PT S AU Kamal, B Marciano, WJ Parsa, Z AF Kamal, B Marciano, WJ Parsa, Z BE Cline, DB TI Resonant Higgs enhancement at the First Muon Collider SO PHYSICS POTENTIAL AND DEVELOPMENT OF MU+MU- COLLIDERS SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT 4th International Conference on Physics Potential and Development of mu+mu- Colliders CY DEC, 1997 CL SAN FRANCISCO, CA SP US DOE AB The effect of beam polarization on Higgs resonance signals and backgrounds (b (b) over bar, tau<(tau)over bar>, c (c) over bar) at the First Muon Collider is studied. Angular distributions (forward-backward charge asymmetries) are examined. The resulting effective enhancement of the Higgs signal relative to the background is investigated as is the reduction in scan time required for Higgs "discovery". C1 Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. RP Kamal, B (reprint author), Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0094-243X BN 1-56396-723-5 J9 AIP CONF PROC PY 1998 VL 441 BP 174 EP 179 PG 6 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BL93A UT WOS:000077174700019 ER PT S AU Palmer, RB AF Palmer, RB CA Muon Collider Collaboration BE Cline, DB TI Muon collider design SO PHYSICS POTENTIAL AND DEVELOPMENT OF MU+MU- COLLIDERS SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT 4th International Conference on Physics Potential and Development of mu+mu- Colliders CY DEC, 1997 CL SAN FRANCISCO, CA SP US DOE AB Parameters are given of machines with center-of-mass (CoM) energies of 3 TeV and 400 GeV but, besides a comment on neutrino radiation, the paper concentrates on progress on the design of a machine to operate at a light Higgs mass, assumed, for this study, to be 100 GeV (CoM). This article reviews the same material covered in the report [1]. C1 Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. RP Palmer, RB (reprint author), Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0094-243X BN 1-56396-723-5 J9 AIP CONF PROC PY 1998 VL 441 BP 183 EP 208 PG 26 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BL93A UT WOS:000077174700020 ER PT S AU Johnstone, C Drozhdin, A Mokhov, N Wan, W Garren, A AF Johnstone, C Drozhdin, A Mokhov, N Wan, W Garren, A BE Cline, DB TI An isochronous lattice design for a 50 on 50 GeV muon collider SO PHYSICS POTENTIAL AND DEVELOPMENT OF MU+MU- COLLIDERS SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT 4th International Conference on Physics Potential and Development of mu+mu- Colliders CY DEC, 1997 CL SAN FRANCISCO, CA SP US DOE AB Using local chromatic correction techniques, a lattice for a 50 on 5-GeV muon collider has been developed which can serve as a broad-band (broad momentum acceptance) or a high-resolution (narrow momentum acceptance) Higgs factory. To reach design luminosities of 13(32) and 10(31)cm(-2)s(-1), a short bunch length, minimal ring circumference, and a beta* of 4 cm and 13 cm must be realized in the broad-band and high-resolution machines, respectively. In the broad-band machine, local chromatic correction of the Interaction Region is required to provide adequate momentum acceptance. However, local chromatic correction conflicts with demands for extreme compactness and isochronicity, making the lattice design challenging. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Johnstone, C (reprint author), Fermi Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0094-243X BN 1-56396-723-5 J9 AIP CONF PROC PY 1998 VL 441 BP 209 EP 219 PG 11 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BL93A UT WOS:000077174700021 ER PT S AU Ng, EY Trbojevic, D AF Ng, EY Trbojevic, D BE Cline, DB TI The lattice for the 50-50 GeV muon collider SO PHYSICS POTENTIAL AND DEVELOPMENT OF MU+MU- COLLIDERS SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT 4th International Conference on Physics Potential and Development of mu+mu- Colliders CY DEC, 1997 CL SAN FRANCISCO, CA SP US DOE AB The lattice design of the 50-50 Gev muon collider is presented. Due to the short lifetime of the 50 GeV muons. the ring needs to be as small as possible. The 4 cm low betas in both planes lead to high betatron functions at the focusing quadrupoles and hence large chromaticities, which must be corrected locally. In order to maintain a low rf voltage of around 10 MV, the momentum-compaction factor must be kept to less than 10(-2), and therefore the flexible momentum-compaction modules are used in the arcs. The dynamical aperture is larger than 6 to 7 rms beam size for +/-5 rms momentum offset. Comments are given and modifications are suggested. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Ng, EY (reprint author), Fermi Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0094-243X BN 1-56396-723-5 J9 AIP CONF PROC PY 1998 VL 441 BP 220 EP 227 PG 8 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BL93A UT WOS:000077174700022 ER PT S AU Raja, R Tollestrup, A AF Raja, R Tollestrup, A BE Cline, DB TI Calibrating the energy of a 50 x 50 GeV muon collider using spin precession SO PHYSICS POTENTIAL AND DEVELOPMENT OF MU+MU- COLLIDERS SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT 4th International Conference on Physics Potential and Development of mu+mu- Colliders CY DEC, 1997 CL SAN FRANCISCO, CA SP US DOE AB The neutral Higgs boson is expected to have a mass in the region 90-150 GeV/c(2) in various schemes within the Minimal Supersymmetric extension to the Standard Model. A first generation Muon Collider is uniquely suited to investigate the mass, width and decay modes of the Higgs boson, since the coupling of the Higgs to muons is expected to be strong enough for it to be produced in the s channel mode in the muon collider. Due to the narrow width of the Higgs, it is necessary to measure and control the energy of the individual muon bunches to a precision of a, few parts in a. million. We investigate the feasibility of determining the energy scale of a muon collider ring with circulating muon beams of 50 GeV energy by measuring the turn by turn variation of the energy deposited by electrons produced by the decay of the muons. This variation is caused by the existence of an average initial polarization of the muon beam and a non-sere value of g - 2 for the muon. We demonstrate that it is feasible to determine the energy scale of the machine with this method to a few parts per million using data collected during 1000 turns. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Raja, R (reprint author), Fermi Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0094-243X BN 1-56396-723-5 J9 AIP CONF PROC PY 1998 VL 441 BP 228 EP 241 PG 14 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BL93A UT WOS:000077174700023 ER PT S AU Drozhdin, A Mokhov, N Johnstone, C Wan, W Garren, A AF Drozhdin, A Mokhov, N Johnstone, C Wan, W Garren, A BE Cline, DB TI Scraping beam halo in mu(+)mu(-) colliders SO PHYSICS POTENTIAL AND DEVELOPMENT OF MU+MU- COLLIDERS SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT 4th International Conference on Physics Potential and Development of mu+mu- Colliders CY DEC, 1997 CL SAN FRANCISCO, CA SP US DOE AB Beam halo scraping schemes have been explored in the 50x50 GeV and 2x2 TeV mu(+)mu(-) colliders using both absorbers and electrostatic deflectors. Utility sections have been specially designed into the rings for scraping. Results of realistic STRUCT-MARS Monte-Carlo simulations show that for the low-energy machine a scheme with a 5 m long steel absorber suppresses losses in the interaction region by three orders of magnitude. The same scraping efficiency at 2 TeV is achieved only by complete extraction of beam halo from the machine. The effect of beam-induced power dissipation in the collider superconducting magnets and detector backgrounds is shown both for the first few turns after injection and for the rest of the cycle. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Drozhdin, A (reprint author), Fermi Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 0 TC 2 Z9 2 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0094-243X BN 1-56396-723-5 J9 AIP CONF PROC PY 1998 VL 441 BP 242 EP 248 PG 7 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BL93A UT WOS:000077174700024 ER PT S AU Neuffer, D AF Neuffer, D BE Cline, DB TI Phase space exchange in thick wedge absorbers for ionization cooling SO PHYSICS POTENTIAL AND DEVELOPMENT OF MU+MU- COLLIDERS SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT 4th International Conference on Physics Potential and Development of mu+mu- Colliders CY DEC, 1997 CL SAN FRANCISCO, CA SP US DOE AB The problem of phase space exchange in wedge absorbers with ionization cooling is discussed. The wedge absorber exchanges transverse and longitudinal phase space by introducing a position-dependent energy loss. In this paper we note that the wedges used with ionization cooling are relatively thick, so that single wedges cause relatively large changes in beam phase space. Calculation methods adapted to such "thick wedge" cases are presented, and beam phase-space transformations through such wedges are discussed. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Neuffer, D (reprint author), Fermi Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0094-243X BN 1-56396-723-5 J9 AIP CONF PROC PY 1998 VL 441 BP 270 EP 281 PG 12 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BL93A UT WOS:000077174700027 ER PT S AU Gallardo, JC Fernow, RC Palmer, RB AF Gallardo, JC Fernow, RC Palmer, RB BE Cline, DB TI Muon dynamics in a toroidal sector magnet SO PHYSICS POTENTIAL AND DEVELOPMENT OF MU+MU- COLLIDERS SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT 4th International Conference on Physics Potential and Development of mu+mu- Colliders CY DEC, 1997 CL SAN FRANCISCO, CA SP US DOE AB We present a Hamiltonian formulation of muon dynamics in toroidal sector solenoids (bent solenoid). C1 Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. RP Gallardo, JC (reprint author), Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0094-243X BN 1-56396-723-5 J9 AIP CONF PROC PY 1998 VL 441 BP 282 EP 288 PG 7 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BL93A UT WOS:000077174700028 ER PT S AU Parsa, Z AF Parsa, Z BE Cline, DB TI Ionization cooling and muon dynamics SO PHYSICS POTENTIAL AND DEVELOPMENT OF MU+MU- COLLIDERS SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT 4th International Conference on Physics Potential and Development of mu+mu- Colliders CY DEC, 1997 CL SAN FRANCISCO, CA SP US DOE AB Muon colliders potential to provide a probe for fundamental particle physics is very interesting. To obtain the needed collider luminosity, the phase-space volume must be greatly reduced within the muon life time. The Ionization cooling is the preferred method used to compress the phase space and reduce the emittance to obtain high luminosity muon beams. We note that, the ionization losses results not only in damping, but also heating. We discuss methods used including moments methods, Focker-Plank Equation, and Multi Particle Codes. In addition we show how a simple analysis permits us to estimate the most part of the optimal system parameters, such as optimal damping rates, length of the system and energy. C1 Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. RP Parsa, Z (reprint author), Brookhaven Natl Lab, Dept Phys, 901A, Upton, NY 11973 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0094-243X BN 1-56396-723-5 J9 AIP CONF PROC PY 1998 VL 441 BP 289 EP 294 PG 6 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BL93A UT WOS:000077174700029 ER PT S AU Balbekov, VI Van Ginneken, A AF Balbekov, VI Van Ginneken, A BE Cline, DB TI Ring cooler for muon collider SO PHYSICS POTENTIAL AND DEVELOPMENT OF MU+MU- COLLIDERS SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT 4th International Conference on Physics Potential and Development of mu+mu- Colliders CY DEC, 1997 CL SAN FRANCISCO, CA SP US DOE AB The possibilities of a ring cooler stage in a muon collider are explored. A basic design is examined both with analytic calculations and simulation of the evolution of beam phase space. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Balbekov, VI (reprint author), Fermi Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 0 TC 9 Z9 9 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0094-243X BN 1-56396-723-5 J9 AIP CONF PROC PY 1998 VL 441 BP 310 EP 313 PG 4 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BL93A UT WOS:000077174700031 ER PT S AU Norem, J Ankenbrandt, C Ng, KY Popovic, M Qian, Z Ahrens, LA Brennan, M Mane, V Roser, T Trbojevic, D van Asselt, W AF Norem, J Ankenbrandt, C Ng, KY Popovic, M Qian, Z Ahrens, LA Brennan, M Mane, V Roser, T Trbojevic, D van Asselt, W BE Cline, DB TI An AGS experiment to test bunching for the proton driver of the muon collider SO PHYSICS POTENTIAL AND DEVELOPMENT OF MU+MU- COLLIDERS SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT 4th International Conference on Physics Potential and Development of mu+mu- Colliders CY DEC, 1997 CL SAN FRANCISCO, CA SP US DOE AB The proton driver for the muon collider must produce short pulses of protons in order to facilitate muon cooling and operation with polarized beams. In order to test methods of producing these bunches we have operated the AGS near transition and studied procedures which involved moving the transition energy gamma(t) to the beam energy. We were able to produce stable bunches with RMS widths of sigma= 2.2 - 2.7 ns for longitudinal bunch areas of similar to 1.5 V-s, in addition to making measurements of the lowest two orders of the momentum compaction factor. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Norem, J (reprint author), Fermi Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0094-243X BN 1-56396-723-5 J9 AIP CONF PROC PY 1998 VL 441 BP 314 EP 319 PG 6 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BL93A UT WOS:000077174700032 ER PT S AU Mokhov, NV Van Ginneken, A AF Mokhov, NV Van Ginneken, A BE Cline, DB TI Pion production and targetry at mu(+)mu(-)colliders SO PHYSICS POTENTIAL AND DEVELOPMENT OF MU+MU- COLLIDERS SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT 4th International Conference on Physics Potential and Development of mu+mu- Colliders CY DEC, 1997 CL SAN FRANCISCO, CA SP US DOE AB Results of simulations of pion production and power dissipation by 8 to 30 GeV proton beams in co-axial and tilted targets of liquid gallium and platinum oxide; placed in a 20 T solenoid, are reported. Pion and muon distributions are followed through the matching solenoid and decay channel. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Mokhov, NV (reprint author), Fermi Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0094-243X BN 1-56396-723-5 J9 AIP CONF PROC PY 1998 VL 441 BP 320 EP 324 PG 5 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BL93A UT WOS:000077174700033 ER PT S AU Marciano, WJ AF Marciano, WJ BE Cline, DB TI The physics of muon colliders - A perspective SO PHYSICS POTENTIAL AND DEVELOPMENT OF MU+MU- COLLIDERS SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT 4th International Conference on Physics Potential and Development of mu+mu- Colliders CY DEC, 1997 CL SAN FRANCISCO, CA SP US DOE AB The physics objectives of future muon colliders are discussed. Attractive features of various energy options are described. Comments on the utility of polarization for Z and Higgs resonance studies are given. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Marciano, WJ (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 0 TC 2 Z9 2 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0094-243X BN 1-56396-723-5 J9 AIP CONF PROC PY 1998 VL 441 BP 347 EP 353 PG 7 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA BL93A UT WOS:000077174700037 ER PT J AU Mourou, GA Barty, CPJ Perry, MD AF Mourou, GA Barty, CPJ Perry, MD TI Ultrahigh-intensity lasers: Physics of the extreme on a tabletop SO PHYSICS TODAY LA English DT Article ID TI-SAPPHIRE LASER; OPTICAL PULSES; ELECTRON ACCELERATION; PLASMA-WAVES; GENERATION; AMPLIFICATION; RECOMPRESSION; EXPANSION; PHASE; GAIN AB By stretching, amplifying and then compressing laser pulses, one can reach petawatt powers, gigagauss magnetic fields, terabar light pressures and 10(22) m/s(2) electron accelerations. C1 Univ Michigan, NSF Ctr Ultrafast Opt Sci, Ann Arbor, MI 48109 USA. Univ Calif San Diego, Inst Nonlinear Sci, La Jolla, CA 92093 USA. Univ Calif Lawrence Livermore Natl Lab, Laser Sci & Technol Grp, Livermore, CA USA. RP Mourou, GA (reprint author), Univ Michigan, NSF Ctr Ultrafast Opt Sci, Ann Arbor, MI 48109 USA. NR 29 TC 517 Z9 532 U1 6 U2 43 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 USA SN 0031-9228 J9 PHYS TODAY JI Phys. Today PD JAN PY 1998 VL 51 IS 1 BP 22 EP 28 DI 10.1063/1.882131 PG 7 WC Physics, Multidisciplinary SC Physics GA YP908 UT WOS:000071328100006 ER PT J AU Seaborg, GT AF Seaborg, GT TI Norris Edwin Bradbury - Obituary SO PHYSICS TODAY LA English DT Biographical-Item C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Seaborg, GT (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 USA SN 0031-9228 J9 PHYS TODAY JI Phys. Today PD JAN PY 1998 VL 51 IS 1 BP 74 EP 75 DI 10.1063/1.882111 PG 2 WC Physics, Multidisciplinary SC Physics GA YP908 UT WOS:000071328100020 ER PT J AU Rowe, CL Kinney, OM Nagle, RD Congdon, JD AF Rowe, CL Kinney, OM Nagle, RD Congdon, JD TI Elevated maintenance costs in an anuran (Rana catesbeiana) exposed to a mixture of trace elements during the embryonic and early larval periods SO PHYSIOLOGICAL ZOOLOGY LA English DT Article ID OXYGEN-CONSUMPTION; ECOTOXICOLOGY; MOLLUSKS; EXERCISE; BIVALVE; STRESS; LEAD AB We investigated the relationship between maintenance costs (standard metabolic rates, measured as O-2 consumption at rest) in tadpoles of the bullfrog, Rana catesbeiana, and exposure to contaminants in a coal ash-polluted habitat (characterized by a variety of trace elements). We compared metabolic rates of tadpoles collected from the polluted site with those from an unpolluted reference pond. Tadpoles collected in the polluted site had 40%-97% higher standard metabolic rates than those collected from the reference pond. We also reciprocally transplanted eggs of the bullfrog between the polluted site and another reference pond and compared standard metabolic rates of tadpoles at 25 and 80 d posthatching. Metabolic rates of tadpoles raised in the polluted site were from 39% to 175% higher than those raised in a reference pond, depending on tadpole age and temperature at which metabolic rates were measured. There were no effects of site of origin of the eggs (polluted or unpolluted) on metabolic rates. Survival to hatching did not differ between sites, although survival to the end of the experiment (80 d posthatching) was lower in the polluted area than in the reference site. Surviving tadpoles were larger in wet body mass in the polluted site than in the reference pond, possibly due to lower survival in the former, but there was no relationship between survival and metabolic rate. It is clear that some feature of the polluted habitat was responsible for causing substantial elevation of standard metabolic rates of tadpoles. We hypothesize that the mixture of trace elements present in sediment and water in the polluted site was responsible for the observed physiological differences. C1 Univ Georgia, Reprints Dept, Savannah River Ecol Lab, Aiken, SC 29802 USA. RP Rowe, CL (reprint author), Univ Georgia, Reprints Dept, Savannah River Ecol Lab, Drawer E, Aiken, SC 29802 USA. RI Rowe, Christopher/D-5271-2012 NR 36 TC 114 Z9 120 U1 2 U2 23 PU UNIV CHICAGO PRESS PI CHICAGO PA 5801 S ELLIS AVENUE, CHICAGO, IL 60637 USA SN 0031-935X J9 PHYSIOL ZOOL JI Physiol. Zool. PD JAN-FEB PY 1998 VL 71 IS 1 BP 27 EP 35 PG 9 WC Physiology; Zoology SC Physiology; Zoology GA YV295 UT WOS:000071808900004 PM 9472810 ER PT S AU Klein, GJ Teng, X Schoenemann, PT Budinger, TF AF Klein, GJ Teng, X Schoenemann, PT Budinger, TF BE Hoffman, EA TI A sensitivity analysis of brain morphometry based on MRI-derived surface models SO PHYSIOLOGY AND FUNCTION FROM MULTIDIMENSIONAL IMAGES - MEDICAL IMAGING 1998 SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT Conference on Physiology and Function from Multidimensional Images - Medical Imaging 1998 CY FEB 22-23, 1998 CL SAN DIEGO, CA SP Soc Photo Opt Instrumentat Engineers, Amer Assoc Physicists Med, Amer Physiol Soc, US FDA, Ctr Devices & Radiol Hlth, Natl Elect Manufacturers Assoc, Diagnost Imaging & Therapy Syst Div, Radiol Informat Syst Consortium, Radiol Soc N Amer, Soc Comp Applicat Radiol DE brain morphometry; surface models; segmentation AB Quantification of brain structure is important for evaluating changes in brain size with growth and aging and for characterizing neurodegeneration disorders. Previous quantification efforts using ex vivo techniques suffered considerable error due to shrinkage of the cerebrum after extraction from the skull, deformation of slices during sectioning, and numerous other factors. In viva imaging studies of brain anatomy avoid these problems and allow repetitive studies following progression of brain structure changes due to disease or natural processes. We have developed a methodology for obtaining triangular mesh models of the cortical surface from MRI brain datasets. The cortex is segmented from nonbrain tissue using a 2D region-growing technique combined with occasional manual edits. Once segmented, thresholding and image morphological operations (erosions and openings) are used to expose the regions between adjacent surfaces in deep cortical folds. A 2D region-following procedure is then used to find a set of contours outlining the cortical boundary on each slice. The contours on all slices are tiled together to form a closed triangular mesh model approximating the cortical surface. This model can be used for calculation of cortical surface area and volume, as well as other parameters of interest. Except for the initial segmentation of the cortex from the skull, the technique is automatic and requires only modest computation time on modern workstations. Though the use of image data avoids many of the pitfalls of ex vivo and sectioning techniques, our MRI-based technique is still vulnerable to errors that may impact the accuracy of estimated brain structure parameters. Potential inaccuracies include segmentation errors due to incorrect thresholding, missed deep sulcal surfaces, falsely segmented holes due to image noise and surface tiling artifacts. The focus of this paper is the characterization of these errors and how they affect measurements of cortical surface area and volume. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Ctr Funct Imaging, Berkeley, CA 94720 USA. RP Klein, GJ (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Ctr Funct Imaging, 350 Barrows Hall, Berkeley, CA 94720 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SPIE-INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA SN 0277-786X BN 0-8194-2782-9 J9 P SOC PHOTO-OPT INS PY 1998 VL 3337 BP 294 EP 303 DI 10.1117/12.312575 PG 10 WC Optics; Radiology, Nuclear Medicine & Medical Imaging SC Optics; Radiology, Nuclear Medicine & Medical Imaging GA BL36M UT WOS:000075286400030 ER PT B AU Gray, GR McIntosh, L AF Gray, GR McIntosh, L BE Moller, IM Gardestrom, P Glimelius, K Glaser, E TI Respiratory carbon flux: NAD(P)(+)-dependent isocitrate dehydrogenases SO PLANT MITOCHONDRIA: FROM GENE TO FUNCTION LA English DT Proceedings Paper CT International Congress on Plant Mitochondria - From Gene to Function (ICPM98) CY JUN 22-27, 1998 CL ARONSBORG, SWEDEN ID ALTERNATIVE OXIDASE; MITOCHONDRIA; TOBACCO; CYCLE C1 Michigan State Univ, MSU DOE Plant Res Lab, E Lansing, MI 48824 USA. RP Gray, GR (reprint author), Michigan State Univ, MSU DOE Plant Res Lab, E Lansing, MI 48824 USA. NR 19 TC 2 Z9 2 U1 0 U2 0 PU BACKHUYS PUBLISHERS PI LEIDEN PA PO BOX 321, 2300 AH LEIDEN, NETHERLANDS BN 90-5782-009-9 PY 1998 BP 353 EP 357 PG 5 WC Plant Sciences; Cell Biology SC Plant Sciences; Cell Biology GA BM56G UT WOS:000079103300066 ER PT B AU Eichler, T Gray, GR Mcintosh, L AF Eichler, T Gray, GR Mcintosh, L BE Moller, IM Gardestrom, P Glimelius, K Glaser, E TI Alternative pathway respiration and tricarboxylic acid cycle mediated carbon flow SO PLANT MITOCHONDRIA: FROM GENE TO FUNCTION LA English DT Proceedings Paper CT International Congress on Plant Mitochondria - From Gene to Function (ICPM98) CY JUN 22-27, 1998 CL ARONSBORG, SWEDEN ID OXIDASE; PROLINE; TOBACCO; PLANTS; CELLS; NACL C1 Michigan State Univ, MSU DOE Plant Res Lab, E Lansing, MI 48824 USA. RP Eichler, T (reprint author), Michigan State Univ, MSU DOE Plant Res Lab, E Lansing, MI 48824 USA. NR 11 TC 0 Z9 0 U1 0 U2 0 PU BACKHUYS PUBLISHERS PI LEIDEN PA PO BOX 321, 2300 AH LEIDEN, NETHERLANDS BN 90-5782-009-9 PY 1998 BP 445 EP 448 PG 4 WC Plant Sciences; Cell Biology SC Plant Sciences; Cell Biology GA BM56G UT WOS:000079103300082 ER PT J AU Koornneef, M Leon-Kloosterziel, KM Schwartz, SH Zeevaart, JAD AF Koornneef, M Leon-Kloosterziel, KM Schwartz, SH Zeevaart, JAD TI The genetic and molecular dissection of abscisic acid biosynthesis and signal transduction in Arabidopsis SO PLANT PHYSIOLOGY AND BIOCHEMISTRY LA English DT Article DE abscisic acid; gibberellins; seed dormancy; stress responses; stomatal closure; Arabidopsis thaliana ID THALIANA L HEYNH; PROTEIN PHOSPHATASE; SEED DEVELOPMENT; FREEZING TOLERANCE; COLD-ACCLIMATION; MUTANTS; ABA; ACCUMULATION; RESPONSES; DROUGHT AB The role of the plant hormone abscisic acid (ABA) has been studied in Arabidopsis by using mutants affected in either the biosynthesis or the mode of action of this hormone. Mutants have been isolated mainly by altered germination characteristics and seedling growth. The biochemical lesions of the aba1, aba2 and aba3 mutants have been identified and the zeaxanthin epoxidase gene encoded by ABA1 has been cloned by homology with a Nicotiana plumbaginifolia gene blocked at the same biosynthetic step. ABA-insensitive mutants have either a phenotype affecting several ABA processes (abi1 and abi2) and therefore were suggested to encode early steps in ABA signal transduction, or they affect specific steps (e.g. abi3, abi4, abi5). The ABI1 and ABI2 genes encode protein phosphatase 2C enzymes and ABI3 a transcription factor with seed-specific expression. The ABA hypersensitive era1 mutant is impaired in a farnesyl transferase. The various mutants have been used to analyse the role of ABA in seed development and seed germination, stress tolerance, and stomatal closure. (C) Elsevier, Paris. C1 Agr Univ Wageningen, Dept Genet, NL-6703 HA Wageningen, Netherlands. Michigan State Univ, MSU DOE, Plant Res Lab, E Lansing, MI 48824 USA. RP Koornneef, M (reprint author), Agr Univ Wageningen, Dept Genet, Dreijenlaan 2, NL-6703 HA Wageningen, Netherlands. OI Koornneef, Maarten/0000-0002-7759-4869 NR 44 TC 122 Z9 137 U1 3 U2 34 PU GAUTHIER-VILLARS/EDITIONS ELSEVIER PI PARIS PA 23 RUE LINOIS, 75015 PARIS, FRANCE SN 0981-9428 J9 PLANT PHYSIOL BIOCH JI Plant Physiol. Biochem. PD JAN-FEB PY 1998 VL 36 IS 1-2 BP 83 EP 89 DI 10.1016/S0981-9428(98)80093-4 PG 7 WC Plant Sciences SC Plant Sciences GA ZA757 UT WOS:000072397800008 ER PT J AU Rule, KR Larson, S Kivler, P Scott, J AF Rule, KR Larson, S Kivler, P Scott, J TI Portable tritium processing using a drum bubbler SO PLASMA DEVICES AND OPERATIONS LA English DT Article DE tritium; drum bubbler; TFTR; radioactive waste; vacuum vessel; exhaust AB The removal of free tritium (primarily in the oxide form) is required for personnel and environmental protection prior to maintenance inside the Tokamak Fusion Test Reactor (TFTR) vacuum vessel. The conventional methods for reducing the tritium hazard involve removing gas from TFTR and processing it through catalyst and molecular sieve beds using the Tritium Processing Systems. Among these methods, the most effective is the introduction of ambient air into the vacuum vessel which improves the removal of tritium oxide. Princeton Plasma Physics Laboratory (" PPPL ") refers to this activity as pump-purges. Pump-purges are very effective, but significantly increase the amount of radioactive waste because of the number of Disposable Molecular Sieve Beds (" DMSB ") required. C1 Princeton Univ, Plasma Phys Lab, Princeton, NJ 08543 USA. RP Rule, KR (reprint author), Princeton Univ, Plasma Phys Lab, POB 451, Princeton, NJ 08543 USA. NR 3 TC 1 Z9 1 U1 1 U2 3 PU GORDON BREACH SCI PUBL LTD PI READING PA C/O STBS LTD, PO BOX 90, READING RG1 8JL, BERKS, ENGLAND SN 1051-9998 J9 PLASMA DEVICES OPER JI Plasma Devices Oper. PY 1998 VL 6 IS 1-3 BP 203 EP 210 DI 10.1080/10519999808226639 PG 8 WC Nuclear Science & Technology; Physics, Fluids & Plasmas SC Nuclear Science & Technology; Physics GA 161UE UT WOS:000078307400024 ER PT J AU Cohen, BI LoDestro, LL Hooper, EB Casper, TA AF Cohen, BI LoDestro, LL Hooper, EB Casper, TA TI Simulations of broadband short-pulse reflectometry for diagnosing plasma density and magnetic-field profiles SO PLASMA PHYSICS AND CONTROLLED FUSION LA English DT Article ID MICROWAVE REFLECTOMETRY; FUSION PLASMAS; FLUCTUATIONS; SENSITIVITY; ABSORPTION; EMISSION; TOKAMAK AB Numerical simulations of the use of ultra-short-pulse reflectometry to diagnose plasma density and magnetic-field profiles are presented. Numerical solutions of Maxwell's equations are used to model the propagation of ordinary modes into a plasma from whose reflected signals' time-of-flight (group delay) as a function of frequency is deduced the electron density profile. Similar methods are used to simulate the propagation and reflection of extraordinary waves, from which is deduced the magnetic-field profile if the electron density is already known (the cutoff relation for the extraordinary mode depends jointly on the electron density and the magnetic field). The simulation results presented here demonstrate that the determination of plasma density and magnetic-field profiles from ultra-short-pulse reflectometry is relatively robust. In order to use more realistic plasma and magnetic-field configurations in the reflectometry simulations as well as to be able to simulate, assess, and tune the performance of the diagnostic in the experimental configurations of interest, O-mode and X-mode reflectometry simulation packages have been merged into the CORSICA comprehensive plasma modelling framework. Examples of CORSICA reflectometry simulations of the DIII-D tokamak and the SSPX spheromak being built at the Lawrence Livermore National Laboratory are presented. C1 Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Cohen, BI (reprint author), Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. NR 33 TC 14 Z9 14 U1 0 U2 3 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0741-3335 J9 PLASMA PHYS CONTR F JI Plasma Phys. Control. Fusion PD JAN PY 1998 VL 40 IS 1 BP 75 EP 89 DI 10.1088/0741-3335/40/1/003 PG 15 WC Physics, Fluids & Plasmas SC Physics GA YW415 UT WOS:000071933000003 ER PT J AU Koide, Y Burrell, KH Rice, BW Fujita, T AF Koide, Y Burrell, KH Rice, BW Fujita, T TI Comparison of internal transport barriers in JT-60U and DIII-D NCS discharges SO PLASMA PHYSICS AND CONTROLLED FUSION LA English DT Article ID REVERSED MAGNETIC SHEAR; ENHANCED CONFINEMENT; TOKAMAK; PERFORMANCE; PLASMA; TURBULENCE; TFTR AB Negative central shear discharges in JT-60U revealed an internal transport barrier (ITB) which is located at larger minor radii (rho less than or equal to 0.8) than those in other devices and is accompanied by a clear reduction in chi(e). In order to investigate this origin of the unique and favourable feature for future reactors, the discharge parameters were compared with those in DIII-D, where ITB was at smaller minor radii (rho less than or equal to 0.55) and less reduction in chi(c) was observed. Strong negative magnetic shear was found to be related to the reduction in chi(c). The thin skin depth in JT-60U originating from high T(e), together with the continuous decrease in q(95), was effective in moving the ITB location to larger minor radii and in sustaining the strong negative shear. C1 Japan Atom Energy Res Inst, Naka Fus Res Estab, Naka, Ibaraki 31101, Japan. Gen Atom Co, San Diego, CA 92186 USA. Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Koide, Y (reprint author), Japan Atom Energy Res Inst, Naka Fus Res Estab, 801-1 Mukoyama, Naka, Ibaraki 31101, Japan. NR 29 TC 21 Z9 22 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0741-3335 J9 PLASMA PHYS CONTR F JI Plasma Phys. Control. Fusion PD JAN PY 1998 VL 40 IS 1 BP 97 EP 110 DI 10.1088/0741-3335/40/1/005 PG 14 WC Physics, Fluids & Plasmas SC Physics GA YW415 UT WOS:000071933000005 ER PT S AU De Schepper, D AF De Schepper, D CA HERMES collaboration BE Holt, RJ Miller, MA TI The HERMES He-3 target SO POLARIZED GAS TARGETS AND POLARIZED BEAMS - SEVENTH INTERNATIONAL WORKSHOP SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT 7th International Workshop on Polarized Gas Targets and Polarized Beams CY AUG 18-22, 1997 CL UNIV ILLINOIS, URBANA, IL SP US Natl Sci Fdn, Int Comm High Energy Spin Phys Symposia, Thomas Jefferson Natl Accelator Facil, Jefferson Lab, Univ Ill, Dept Phys, Urbana Champaign HO UNIV ILLINOIS AB The HERMES experiment uses an internal target in the HERA positron ring at DESY to study polarized inclusive and semi-inclusive deep inelastic scattering processes. Several light nuclei will be used to disentangle the contributions of protons and neutrons. In 1995 HERMES used an optically pumped metastability exchange He-3 target. This target is described in this paper, with emphasis on the specific adaptations to the HERMES experiment. C1 Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA. RP De Schepper, D (reprint author), Argonne Natl Lab, Div Phys, Bldg 203-Rm C-258,9700 S Cass Ave, Argonne, IL 60439 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0094-243X BN 1-56396-700-6 J9 AIP CONF PROC PY 1998 IS 421 BP 16 EP 25 PG 10 WC Physics, Fluids & Plasmas; Physics, Nuclear; Physics, Particles & Fields SC Physics GA BK50J UT WOS:000072375000002 ER PT S AU Fedchak, JA Bailey, K Cummings, WJ Gao, H Jones, CE Kowalczyk, RS Magnes, J Pipes, M AF Fedchak, JA Bailey, K Cummings, WJ Gao, H Jones, CE Kowalczyk, RS Magnes, J Pipes, M BE Holt, RJ Miller, MA TI The argonne laser-driven D target: Recent developments and progress. SO POLARIZED GAS TARGETS AND POLARIZED BEAMS - SEVENTH INTERNATIONAL WORKSHOP SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT 7th International Workshop on Polarized Gas Targets and Polarized Beams CY AUG 18-22, 1997 CL UNIV ILLINOIS, URBANA, IL SP US Natl Sci Fdn, Int Comm High Energy Spin Phys Symposia, Thomas Jefferson Natl Accelator Facil, Jefferson Lab, Univ Ill, Dept Phys, Urbana Champaign HO UNIV ILLINOIS AB The first direct measurements of nuclear tensor polarization p(zz) in a laser-driven polarized D target have been performed at Argonne. We present p(zz) and electron polarization P-e data taken at a magnetic field of 600 G in the optical pumping cell. These results are highly indicative that spin-temperature equilibrium is achieved in the system. To prevent spin relaxation of D and K atoms as well as the molecular recombination of D atoms, the walls of the laser-driven D target are coated with organosilane compounds. We discuss a new coating technique, the "afterwash", developed at Argonne which has yielded stable atomic fraction results when the coating is exposed to K. We also present new coating techniques for glass and Cu substrates. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Fedchak, JA (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. RI Gao, Haiyan/G-2589-2011 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0094-243X BN 1-56396-700-6 J9 AIP CONF PROC PY 1998 IS 421 BP 129 EP 138 PG 10 WC Physics, Fluids & Plasmas; Physics, Nuclear; Physics, Particles & Fields SC Physics GA BK50J UT WOS:000072375000015 ER PT S AU Sinclair, CK AF Sinclair, CK BE Holt, RJ Miller, MA TI Polarized electrons at Jefferson Laboratory SO POLARIZED GAS TARGETS AND POLARIZED BEAMS - SEVENTH INTERNATIONAL WORKSHOP SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT 7th International Workshop on Polarized Gas Targets and Polarized Beams CY AUG 18-22, 1997 CL UNIV ILLINOIS, URBANA, IL SP US Natl Sci Fdn, Int Comm High Energy Spin Phys Symposia, Thomas Jefferson Natl Accelator Facil, Jefferson Lab, Univ Ill, Dept Phys, Urbana Champaign HO UNIV ILLINOIS AB The CEBAF accelerator at Jefferson laboratory can deliver CW electron beams to three experimental halls simultaneously. A large fraction of the approved scientific program at the lab requires polarized electron beams. Many of these experiments, both polarized and unpolarized, require high average beam current as well. Since all electrons delivered to the experimental halls originate from the same cathode, delivery of polarized beam to a single hall. requires using the polarized source to deliver beam to all experiments in simultaneous operation The polarized source effort at Jefferson Lab is directed at obtaining very long polarized source operational lifetimes at high average current and beam polarization; at developing the capability to deliver all electrons leaving the polarized source to the experimental halls; and at delivering polarized beam to multiple experimental halls simultaneously. Initial operational experience with the polarized source will be presented. C1 Jefferson Lab, Newport News, VA 23606 USA. RP Sinclair, CK (reprint author), Jefferson Lab, 12000 Jefferson Ave, Newport News, VA 23606 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0094-243X BN 1-56396-700-6 J9 AIP CONF PROC PY 1998 IS 421 BP 218 EP 228 PG 11 WC Physics, Fluids & Plasmas; Physics, Nuclear; Physics, Particles & Fields SC Physics GA BK50J UT WOS:000072375000026 ER PT S AU Clendenin, JE Alley, R Frisch, J Kotseroglou, T Mulhollan, G Schultz, D Tang, H Turner, J Yeremian, AD AF Clendenin, JE Alley, R Frisch, J Kotseroglou, T Mulhollan, G Schultz, D Tang, H Turner, J Yeremian, AD BE Holt, RJ Miller, MA TI The SLAC polarized electron source SO POLARIZED GAS TARGETS AND POLARIZED BEAMS - SEVENTH INTERNATIONAL WORKSHOP SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT 7th International Workshop on Polarized Gas Targets and Polarized Beams CY AUG 18-22, 1997 CL UNIV ILLINOIS, URBANA, IL SP US Natl Sci Fdn, Int Comm High Energy Spin Phys Symposia, Thomas Jefferson Natl Accelator Facil, Jefferson Lab, Univ Ill, Dept Phys, Urbana Champaign HO UNIV ILLINOIS AB Since 1992, the SLAC 3-km linac has operated exclusively with polarized electrons. The polarized electron source is highly reliable, remotely operated and monitored, and able to produce a variety of electron bunch profiles for high-energy physics experiments. The source and its operating characteristics are described. Some implications drawn from the operating experience are discussed. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Clendenin, JE (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0094-243X BN 1-56396-700-6 J9 AIP CONF PROC PY 1998 IS 421 BP 250 EP 259 PG 10 WC Physics, Fluids & Plasmas; Physics, Nuclear; Physics, Particles & Fields SC Physics GA BK50J UT WOS:000072375000029 ER PT S AU Poelker, M Hansknecht, J AF Poelker, M Hansknecht, J BE Holt, RJ Miller, MA TI A diode laser system for synchronous photoinjection SO POLARIZED GAS TARGETS AND POLARIZED BEAMS - SEVENTH INTERNATIONAL WORKSHOP SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT 7th International Workshop on Polarized Gas Targets and Polarized Beams CY AUG 18-22, 1997 CL UNIV ILLINOIS, URBANA, IL SP US Natl Sci Fdn, Int Comm High Energy Spin Phys Symposia, Thomas Jefferson Natl Accelator Facil, Jefferson Lab, Univ Ill, Dept Phys, Urbana Champaign HO UNIV ILLINOIS AB A laser system, which is composed of a gain switched diode seed laser and a single-pass diode optical amplifier, is used to drive the polarized electron source at Jefferson Lab. The system emits pulsed laser light synchronized to the accelerating cavity radio frequency (rf) at 1497 MHz of the third subharmonic, 499 MHz. The maximum average output power from the laser system is 500 mW and the optical pulsewidth is 60 to 80 ps. The laser system is compact and very reliable operating remotely for many days without attention. C1 Jefferson Lab, Newport News, VA 23606 USA. RP Poelker, M (reprint author), Jefferson Lab, 12000 Jefferson Ave, Newport News, VA 23606 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0094-243X BN 1-56396-700-6 J9 AIP CONF PROC PY 1998 IS 421 BP 270 EP 275 PG 6 WC Physics, Fluids & Plasmas; Physics, Nuclear; Physics, Particles & Fields SC Physics GA BK50J UT WOS:000072375000031 ER PT S AU Wei, SH AF Wei, SH BE Holt, RJ Miller, MA TI Spin polarization of photoelectrons from ordered semiconductor alloys SO POLARIZED GAS TARGETS AND POLARIZED BEAMS - SEVENTH INTERNATIONAL WORKSHOP SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT 7th International Workshop on Polarized Gas Targets and Polarized Beams CY AUG 18-22, 1997 CL UNIV ILLINOIS, URBANA, IL SP US Natl Sci Fdn, Int Comm High Energy Spin Phys Symposia, Thomas Jefferson Natl Accelator Facil, Jefferson Lab, Univ Ill, Dept Phys, Urbana Champaign HO UNIV ILLINOIS AB Recently observed spontaneous CuPt-like ordering of III-V semiconductor alloys provides the opportunity of using them as high quality spin polarized photoelectron source. We show that CuPt ordering of semiconductor alloy causes a splitting at the valence band maximum (VBM) and induces an anisotropy in the intensities of the transitions between these split VBM components and the conduction band minimum. We show that for sufficiently ordered single-subvariant sample, the emitted photoelectrons can have 100% spin-polarization. C1 Natl Renewable Energy Lab, Golden, CO 80401 USA. RP Wei, SH (reprint author), Natl Renewable Energy Lab, Golden, CO 80401 USA. NR 0 TC 4 Z9 4 U1 0 U2 1 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0094-243X BN 1-56396-700-6 J9 AIP CONF PROC PY 1998 IS 421 BP 284 EP 295 PG 12 WC Physics, Fluids & Plasmas; Physics, Nuclear; Physics, Particles & Fields SC Physics GA BK50J UT WOS:000072375000033 ER PT S AU Mulhollan, G Clendenin, J Garwin, E Kirby, R Maruyama, T Prepost, R Tang, H AF Mulhollan, G Clendenin, J Garwin, E Kirby, R Maruyama, T Prepost, R Tang, H BE Holt, RJ Miller, MA TI Photocathode research at SLAC SO POLARIZED GAS TARGETS AND POLARIZED BEAMS - SEVENTH INTERNATIONAL WORKSHOP SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT 7th International Workshop on Polarized Gas Targets and Polarized Beams CY AUG 18-22, 1997 CL UNIV ILLINOIS, URBANA, IL SP US Natl Sci Fdn, Int Comm High Energy Spin Phys Symposia, Thomas Jefferson Natl Accelator Facil, Jefferson Lab, Univ Ill, Dept Phys, Urbana Champaign HO UNIV ILLINOIS AB GaAs based photocathode research at SLAC will be described. Recent efforts have focused on both immediate applications and fundamental photocathode properties. This includes revisiting some old measurements with state of-the-art instrumentation. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Mulhollan, G (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0094-243X BN 1-56396-700-6 J9 AIP CONF PROC PY 1998 IS 421 BP 443 EP 445 PG 3 WC Physics, Fluids & Plasmas; Physics, Nuclear; Physics, Particles & Fields SC Physics GA BK50J UT WOS:000072375000057 ER PT S AU Price, JS Poelker, BM Sinclair, CK Assamagan, KA Cardman, LS Grames, J Hansknecht, J Mack, DJ Piot, P AF Price, JS Poelker, BM Sinclair, CK Assamagan, KA Cardman, LS Grames, J Hansknecht, J Mack, DJ Piot, P BE Holt, RJ Miller, MA TI 5 MeV Mott polarimeter development at Jefferson Lab SO POLARIZED GAS TARGETS AND POLARIZED BEAMS - SEVENTH INTERNATIONAL WORKSHOP SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT 7th International Workshop on Polarized Gas Targets and Polarized Beams CY AUG 18-22, 1997 CL UNIV ILLINOIS, URBANA, IL SP US Natl Sci Fdn, Int Comm High Energy Spin Phys Symposia, Thomas Jefferson Natl Accelator Facil, Jefferson Lab, Univ Ill, Dept Phys, Urbana Champaign HO UNIV ILLINOIS AB Low energy (E-k=100 keV) Mott scattering polarimeters are ill-suited to support operations foreseen for the polarized electron injector at Jefferson Lab. One solution is to measure the polarization at 5 MeV where multiple and plural scattering are unimportant and precision beam monitoring is straightforward. The higher injector beam current offsets the lower cross-sections. Recent improvements in the CEBAF injector polarimeter scattering chamber have improved signal to noise. C1 Jefferson Lab, Newport News, VA 23606 USA. RP Price, JS (reprint author), Jefferson Lab, 12000 Jefferson Ave, Newport News, VA 23606 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0094-243X BN 1-56396-700-6 J9 AIP CONF PROC PY 1998 IS 421 BP 446 EP 450 PG 5 WC Physics, Fluids & Plasmas; Physics, Nuclear; Physics, Particles & Fields SC Physics GA BK50J UT WOS:000072375000058 ER PT S AU Cummings, WJ Kowalczyk, RS AF Cummings, WJ Kowalczyk, RS BE Holt, RJ Miller, MA TI Fiber optic applications for laser polarized targets SO POLARIZED GAS TARGETS AND POLARIZED BEAMS - SEVENTH INTERNATIONAL WORKSHOP SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT 7th International Workshop on Polarized Gas Targets and Polarized Beams CY AUG 18-22, 1997 CL UNIV ILLINOIS, URBANA, IL SP US Natl Sci Fdn, Int Comm High Energy Spin Phys Symposia, Thomas Jefferson Natl Accelator Facil, Jefferson Lab, Univ Ill, Dept Phys, Urbana Champaign HO UNIV ILLINOIS AB For the past two years, the laser polarized target group at Argonne has been using multi-mode fiber optic patch cords for a variety of applications. In this paper, we describe our design for transporting high power laser beams with optical fibers currently in use at IUCF. C1 Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA. RP Cummings, WJ (reprint author), Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA SN 0094-243X BN 1-56396-700-6 J9 AIP CONF PROC PY 1998 IS 421 BP 457 EP 458 PG 2 WC Physics, Fluids & Plasmas; Physics, Nuclear; Physics, Particles & Fields SC Physics GA BK50J UT WOS:000072375000060 ER PT J AU Conradson, SD Al Mahamid, I Clark, DL Hess, NJ Hudson, EA Neu, MP Palmer, PD Runde, WH Tait, CD AF Conradson, SD Al Mahamid, I Clark, DL Hess, NJ Hudson, EA Neu, MP Palmer, PD Runde, WH Tait, CD TI Oxidation state determination of plutonium aquo ions using x-ray absorption spectroscopy SO POLYHEDRON LA English DT Article DE XANES; plutonium; oxidation state ID ACTINIDES; CHEMISTRY; URANIUM AB Four oxidation states (III, IV, V, and VI) of Pu may coexist under environmentally relevant conditions. An efficient method to determine the states actually present in various matrices would enhance the ability to model the fate and transport of plutonium in process streams and in the environment. This communication establishes that the L-3 X-ray absorption near-edge structure (XANES) spectra of Pu are primarily determined by the valence state and the presence or absence of the trans dioxo moiety, consistent with previous U and Np XANES studies. The edge energies were observed to shift progressively to higher energy with increasing valence, with an average 1.68 eV increase per formal oxidation state increase. Ih addition, the general spectral shape of the (III) and (IV) species is clearly different from the dioxo-containing (V) and (VI) species, with the first maximum much larger and sharper for the (III) and (IV) spectra than for the (V) and (VI) spectra. (C) 1998 Elsevier Science Ltd. All rights reserved. C1 Los Alamos Natl Lab, Chem Sci & Technol Div, Los Alamos, NM 87545 USA. Los Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USA. Lawrence Berkeley Lab, Berkeley, CA 94550 USA. GT Seaborg Inst Transactinium Sci, Livermore, CA USA. Pacific NW Lab, Dept Mat Sci, Richland, WA 99352 USA. RP Conradson, SD (reprint author), Los Alamos Natl Lab, Chem Sci & Technol Div, Mail Stop D-429, Los Alamos, NM 87545 USA. RI Clark, David/A-9729-2011; OI Hess, Nancy/0000-0002-8930-9500 NR 16 TC 55 Z9 55 U1 2 U2 16 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0277-5387 J9 POLYHEDRON JI Polyhedron PY 1998 VL 17 IS 4 BP 599 EP 602 DI 10.1016/S0277-5387(97)00287-8 PG 4 WC Chemistry, Inorganic & Nuclear; Crystallography SC Chemistry; Crystallography GA YY103 UT WOS:000072113100027 ER PT J AU Terry, KW Su, K Tilley, TD Rheingold, AL AF Terry, KW Su, K Tilley, TD Rheingold, AL TI Alkoxy(siloxy) complexes of tin, lead and bismuth SO POLYHEDRON LA English DT Article DE tin; lead; bismuth; alkoxide; siloxide; precursor ID MOLECULAR PRECURSORS; ALKOXIDES; OXIDE AB By reaction of PbCl2 with 3 equivalents of NaOSi((OBu)-Bu-t)(3), the ate complex NaPb[OSi((OBu)-Bu-t)(3)](3) was obtained. This compound possesses a structure containing a 3-coordinate, trigonal prismatic lead center, and a 6-coordinate Na atom encapsulated in an oxygen matrix formed by the bridging siloxy and tert-butoxy groups of the -OSi((OBu)-Bu-t)(3) ligands. The neutral lead complex Pb[OSi((OBu)-Bu-t)(3)](2) .(BuOH)-Bu-t . CH3CN was obtained from reaction of Pb-3(mu-(OBu)-Bu-t)(6) with HOSi((OBu)-Bu-t)(3). The tin complex KSn[OSi((OBu)-Bu-t)(3)](3), prepared from SnCl2 and KOSi((OBu)-Bu-t)(3), is isomorphous with NaPb[OSi((OBu)-Bu-t)(3)](3). The bismuth compounds Bi[OSi((OBu)-Bu-t)(3)](3) and Bi[OSi((OBu)-Bu-t)(2)Ph](3) were obtained by similar methods. (C) 1998 Elsevier Science Ltd. All rights reserved. C1 Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. Lawrence Berkeley Lab, Div Chem Sci, Berkeley, CA 94720 USA. Univ Delaware, Dept Chem, Newark, DE 19716 USA. RP Tilley, TD (reprint author), Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. NR 26 TC 36 Z9 36 U1 1 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0277-5387 J9 POLYHEDRON JI Polyhedron PY 1998 VL 17 IS 5-6 BP 891 EP 897 DI 10.1016/S0277-5387(97)00260-X PG 7 WC Chemistry, Inorganic & Nuclear; Crystallography SC Chemistry; Crystallography GA ZH074 UT WOS:000073069500027 ER PT J AU Stewart, JL Andersen, RA AF Stewart, JL Andersen, RA TI Trivalent uranium chemistry: molecular structure of [(Me3Si)(2)N](3)U SO POLYHEDRON LA English DT Article DE uranium (III); sylylamide; X-ray; magnetic moment ID PHASE ELECTRON-DIFFRACTION; GAS-PHASE; PHOTOELECTRON-SPECTRA; ORBITAL CALCULATIONS; METAL-HALIDES; COORDINATION; COMPLEXES; GEOMETRY; MODEL; MX2 AB The X-ray crystal structure (-110 degrees C); space group P (3) over bar 1c, a = b = 16.370(2) Angstrom, c = 8.302(1) Angstrom, alpha = beta = 90 degrees, gamma = 120 degrees, V = 1926.7(1) Angstrom(3), Z = 2; shows that the geometry of U[N(SiMe3)(2)](3).1/3 cyclohexane is pyramidal, consistent with deductions made on the basis of infrared spectroscopy. The U-N distance is 2.320(4) Angstrom and the N-U-N angle is 116.24(7)degrees. The solid state magnetic susceptibility from 35-280 K gives mu(eff) of 3.354(4) with theta = -13 K and 3.385(4) B.M. with theta = -11 K at 5 and 40 kGauss, respectively. The effective magnetic moments are similar to that found for UF3 and other trivalent uranium metallocenes, consistent with a 5f(3) electron configuration. (C) 1998 Elsevier Science Ltd. All rights reserved. C1 Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. Ernest Orlando Lawrence Berkeley Natl Lab, Div Chem Sci, Berkeley, CA 94720 USA. RP Stewart, JL (reprint author), Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. NR 49 TC 71 Z9 71 U1 0 U2 12 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0277-5387 J9 POLYHEDRON JI Polyhedron PY 1998 VL 17 IS 5-6 BP 953 EP 958 DI 10.1016/S0277-5387(97)00244-1 PG 6 WC Chemistry, Inorganic & Nuclear; Crystallography SC Chemistry; Crystallography GA ZH074 UT WOS:000073069500034 ER PT J AU Herlinger, AW Ferraro, JR Garcia, JA Chiarizia, R AF Herlinger, AW Ferraro, JR Garcia, JA Chiarizia, R TI A far-infrared study and investigation of the difference between the asymmetric and symmetric POO- stretching frequencies in metal diphosphonate complexes SO POLYHEDRON LA English DT Article DE lanthanide complexes; metal diphosphonates; infrared stretching frequencies ID ACIDS; RADII AB Lanthanide complexes of P,P'-di(2-ethylhexyl) methanediphosphonic acid, H2DEH[MDP], were prepared and investigated by infrared spectroscopy. Qualitative information about the nature of the phosphonate binding in the complexes was obtained by measuring the asymmetric and symmetric POO- stretching frequencies of the ligand. These vibrational modes appear at lower energy in the complexes than in the sodium salt. This indicates symmetrical coordination of the phosphonate groups through chelate and/or bridging interactions. The frequency difference between the POO- stretching bands Delta v becomes smaller as the ionic potential ell of the metal ion increases. The correlation is valid when both oxygen atoms are involved in the bonding and no other absorption bands interfere with the POO- vibrations. The origin of this empirical correlation is the change in the P-O bond order which arises from a change in the strength of the metal-diphosphonate interaction. The far-infrared spectra of the lanthanide complexes, an Fe-54-labelled compound, and the sodium salt of H2DEH[MDP] were measured to provide insight into the nature of the metal-ligand interaction. The appearance of metal-oxygen stretching bands in the iron compound indicates that the iron-diphosphonate interaction has a substantial covalent component whereas the absence of metal-oxygen stretching bands in the lanthanide complexes indicates the binding is predominantly ionic. (C) 1998 Elsevier Science Ltd. All rights reserved. C1 Loyola Univ, Dept Chem, Chicago, IL 60626 USA. Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA. RP Herlinger, AW (reprint author), Loyola Univ, Dept Chem, 6525 N Sheridan Rd, Chicago, IL 60626 USA. NR 28 TC 15 Z9 15 U1 0 U2 6 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0277-5387 J9 POLYHEDRON JI Polyhedron PY 1998 VL 17 IS 9 BP 1471 EP 1475 DI 10.1016/S0277-5387(98)80005-3 PG 5 WC Chemistry, Inorganic & Nuclear; Crystallography SC Chemistry; Crystallography GA ZQ129 UT WOS:000073825200009 ER PT J AU Ali, MA Ibrahim, NEH Butcher, RJ Jasinski, JP Jasinski, JM Bryan, JC AF Ali, MA Ibrahim, NEH Butcher, RJ Jasinski, JP Jasinski, JM Bryan, JC TI Synthesis and characterization of some four- and five-coordinate copper(II) complexes of 6-methyl-2-formylpyridinethiosemicarbazone (HNNS) and the X-ray crystal structures of the [Cn(NNS)(CH3COO)(H2O)] and [Cu(HNNS)(H2O)(SO4)]center dot H2O complexes SO POLYHEDRON LA English DT Article DE copper(II) complexes; 6-methyl-2-formylpyridinethiosemicarbazone four- and five-coordinate; copper(II) complexes; crystal structures of copper(II) complexes ID THIOSEMICARBAZONE HL; 2-FORMYLPYRIDINE AB Copper(II) complexes of general formula, [Cu(NNS)(H2O)(x)X]. nH(2)O (NNS- = uninegatively charged tridentate thiosemicarbazone ligand formed from 6-methyl-2-formylpyridine; X = NCS-, CH3COO-, N-3(-); x = 0,1; n = 0.5, 1) and [Cu(HNNS)(H2O)(SO4)]. H2O have been synthesized and characterized by a variety of physico-chemical techniques. Magnetic and spectroscopic evidence support a square-planar structure for the [Cu(NNS)X] (X = NCS-, N-3(-)) complexes and a five-coordinate structure for the [Cu(HNNS)(H2O)(SO4)]. H2O complex. The crystal structures of the [Cu(NNS)(CH3COO)(H2O)] and [Cu(HNNS)(H2O)(SO4)]. H2O complexes have been determined by X-ray diffraction. The acetato complex has a distorted square-pyramidal geometry with the thiosemicarbazone ligand acting as a uninegatively charged tridentate NNS chelating agent and the fourth and fifth coordination positions of the copper(II) ion are occupied by a unidentate acetate and water ligand, respectively. The sulphate-complex is also five-coordinate with the thiosemicarbazone coordinated as a neutral NNS ligand and the fourth and fifth coordination sites are occupied by a water molecule and a unidentate sulphate ligand, respectively. (C) 1998 Elsevier Science Ltd. All rights reserved. C1 Univ Brunei Darussalam, Dept Chem, Bandar Seri Begawan, Brunei. Howard Univ, Dept Chem, Washington, DC 20059 USA. Keene State Coll, Dept Chem, Keene, NH 03431 USA. Oak Ridge Natl Lab, Div Chem & Analyt Sci, Oak Ridge, TN 37831 USA. RP Ali, MA (reprint author), Univ Brunei Darussalam, Dept Chem, BSB 2028, Bandar Seri Begawan, Brunei. NR 15 TC 32 Z9 32 U1 1 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0277-5387 J9 POLYHEDRON JI Polyhedron PY 1998 VL 17 IS 11-12 BP 1803 EP 1809 DI 10.1016/S0277-5387(97)00531-7 PG 7 WC Chemistry, Inorganic & Nuclear; Crystallography SC Chemistry; Crystallography GA ZR187 UT WOS:000073949000002 ER PT J AU Boyle, TJ Pedrotty, DM Scott, B Ziller, JW AF Boyle, TJ Pedrotty, DM Scott, B Ziller, JW TI Bismuth(III) coordination compounds. Synthesis, characterization, and X-ray structures of [Bi(Cl)(mu-Cl)(2)(THF)(2)](infinity), Bi(O2CMe)(3)(Solv)(x) (Solv = py, x = 2 or MeIm, x = 4) [1], and [Bi(mu-O CH2CMe3)(OCH2CMe3)(2)(Solv)](2) (Solv = HOCH2CMe3 or py) SO POLYHEDRON LA English DT Article DE bismuth; halide; acetate; alkoxide; neopentoxide ID SRBI2TA2O9 THIN-FILMS; CRYSTAL-STRUCTURE; MOLECULAR-STRUCTURE; N-METHYLIMIDAZOLE; FERROELECTRIC PROPERTIES; POLYETHYLENE GLYCOLS; VOLATILE ALKOXIDES; BASE ADDUCTS; COMPLEXES; HALIDES AB We have isolated and structurally characterized several novel bismuth coordination compounds. Dissolution of Bi(NO3)(3) . 5H(2)O in concentrated HCl, followed by crystallization from THF lead to the isolation of [Bi(Cl)(mu-Cl)(2)(THF)(2)](infinity), 1. Each bismuth metal center of 1 adopts a 7-coordinated pentagonal bipyramidal geometry. One THF solvent molecule and one terminal chloride ligand are located in each of the axial positions. A terminal THF solvent molecule and four bridging chlorides reside in the equatorial positions. Dissolution of Bi(O2CMe)(3) in pyridine (py) or N-methylimidazole (MeIm) results in the isolation of the appropriate amine adduct, either Bi(O2CMe)(3)(py)(2), 2 or Bi(O2CMe)(3)(MeIm)(3) .(MeIm), 3. Compound 2 uses two py molecules to adopt an unusual (for bismuth acetate species) 8-coordinated triangular dodecahedral geometry. In contrast, 3 incorporates three MeIm molecules to adopt the 9-coordinated tricapped trigonal prismatic geometry typically observed for bismuth acetate compounds (a "free" MeIm molecule is located in the lattice). The reaction of Bi[N(SiMe3)(2)](3) with HOCH2CMe3 (HONp) yields [Bi(mu-ONp)(ONp)(2)(HONp)](2), 4. An alternative synthetic route to 4 is the metathical exchange between BiCl3 and 3 equivalents of NaONp in the presence of HONp. The bismuth atoms of 4 are 5-coordinated and adopt an apical-shared, square base pyramidal (SP) arrangement. Recrystallization of 4 from py yields the dinuclear complex [Bi(mu-ONp)(ONp)(2)(py)](2), 5. The Bi atoms of 5 also adopt a 5-coordinated SP geometry; however, the two metal centers are linked through a basal-shared arrangement. The apical ONp ligands are in an up-down relationship to each other. (C) 1998 Elsevier Science Ltd. All rights reserved. C1 Sandia Natl Labs, Adv Mat Lab, Albuquerque, NM 87106 USA. Univ Calif Los Alamos Natl Lab, Chem Sci & Technol Div, Xray Diffract Lab, Los Alamos, NM 87545 USA. Univ Calif Irvine, Dept Chem, Xray Facil, Irvine, CA 92717 USA. RP Boyle, TJ (reprint author), Sandia Natl Labs, Adv Mat Lab, 1001 Univ Blvd SE, Albuquerque, NM 87106 USA. RI Scott, Brian/D-8995-2017 OI Scott, Brian/0000-0003-0468-5396 NR 70 TC 19 Z9 21 U1 0 U2 4 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0277-5387 J9 POLYHEDRON JI Polyhedron PY 1998 VL 17 IS 11-12 BP 1959 EP 1974 DI 10.1016/S0277-5387(97)00485-3 PG 16 WC Chemistry, Inorganic & Nuclear; Crystallography SC Chemistry; Crystallography GA ZR187 UT WOS:000073949000021 ER PT J AU Balema, VP Blaurock, S Pecharsky, VK Rys, EG Hey-Hawkins, E AF Balema, VP Blaurock, S Pecharsky, VK Rys, EG Hey-Hawkins, E TI Synthesis and molecular structure of (R,R/S,S)-[PdCl2{1,2-(PPhCl)(2)C2B10H10}] SO POLYHEDRON LA English DT Article DE chlorophosphino-substituted carbaborane; palladium dichloride phosphine complex; molecular structure ID COMPLEXES; CRYSTAL; LIGANDS; PALLADIUM; HYDROLYSIS; PHOSPHORUS AB The complex (R,R/S,S)-[PdCl2{1,2-(PPhCl)(2)C2B10H10}] (1) was prepared by the reaction of (R,R/S,S)-1,2-(PPhCl)(2)C2B10H10 with [(COD)PdCl2] (COD = cyclooctadiene) in CH2Cl2 solution and characterized by NMR spectroscopy (P-31, B-11, H-1) and X-ray structure determination (space group P-). Due to the crystallographic center of inversion, both enantiomeric isomers (R,R) and (S,S) are present in the unit cell. The Pd atom is coordinated in a square-planar fashion by two chloro ligands: and the 1,2-bis(phenylchlorophosphino)-1,2-dicarba-closo-dodecaborane (12) (C) 1998 Elsevier Science Ltd. All rights reserved. C1 Univ Leipzig, Inst Anorgan Chem, D-04103 Leipzig, Germany. Iowa State Univ, Ames Lab, Ames, IA 50011 USA. AN Nesmeyanov Organoelement Cpds Inst, Moscow 117813, Russia. RP Hey-Hawkins, E (reprint author), Univ Leipzig, Inst Anorgan Chem, Talstr 35, D-04103 Leipzig, Germany. RI Hey-Hawkins, Evamarie /H-2278-2012 OI Hey-Hawkins, Evamarie /0000-0003-4267-0603 NR 35 TC 14 Z9 14 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0277-5387 J9 POLYHEDRON JI Polyhedron PY 1998 VL 17 IS 21 BP 3771 EP 3775 DI 10.1016/S0277-5387(98)00183-1 PG 5 WC Chemistry, Inorganic & Nuclear; Crystallography SC Chemistry; Crystallography GA 136EA UT WOS:000076844500015 ER PT J AU Ali, MA Nazimuddin, M Shaha, R Butcher, RJ Bryan, JC AF Ali, MA Nazimuddin, M Shaha, R Butcher, RJ Bryan, JC TI Synthesis and characterization of bis-chelated nickel(II) complexes of the methylpyruvate Schiff bases of S-alkyldithiocarbazates and the X-ray crystal structure of the [Ni(ONSMe)(2)] complex SO POLYHEDRON LA English DT Article DE nickel(II) complexes; Schiff bases; S-alkyldithiocarbazates; crystal structure; methylpyruvate Schiff bases; octahedral nickel(II) complexes ID QUADRIDENTATE SNNS LIGANDS; COPPER(II) COMPLEXES; CADMIUM(II) COMPLEXES; BIOLOGICAL-ACTIVITIES; MOLECULAR-STRUCTURE; METHYLDITHIOCARBAZATE; ZINC(II); BENZYLDITHIOCARBAZATE; KINETICS AB New nickel(II) complexes of general empirical formula: [Ni(ONS)(2)] (ONS- is the anionic form of tridentate ligands formed from methylpyruvate and S-methyl- and S-benzyldithiocarbazates) have been synthesized and characterized by magnetic and spectroscopic techniques. The complexes are six-coordinate and octahedral. The crystal and molecular structure of [Ni(ONSMe)(2)] (ONSMe- is the anionic form of the methylpyruvate Schiff base of S-methyldirhiocarbazate) has been determined by X-ray diffraction which shows that the nickel(II) complex has a distorted octahedral structure with the ligands coordinated to the nickel(II) ion as uninegatively charged tridentate chelating agents via the carbonyl oxygen, the azomethine nitrogen and the mercaptide sulphur atoms. The distortion from regular octahedral geometry is attributed to the restricted bite angles of the planar ONS tridentate ligands. (C) 1998 Elsevier Science Ltd. All rights reserved. C1 Univ Brunei Darussalam, Dept Chem, Brunei Darussalam, Brunei. Univ Chittagong, Dept Chem, Chittagong, Bangladesh. Howard Univ, Dept Chem, Washington, DC 20059 USA. Oak Ridge Natl Lab, Div Chem & Analyt Sci, Oak Ridge, TN 37831 USA. RP Ali, MA (reprint author), Univ Brunei Darussalam, Dept Chem, BSB 2028, Brunei Darussalam, Brunei. NR 23 TC 22 Z9 23 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0277-5387 J9 POLYHEDRON JI Polyhedron PY 1998 VL 17 IS 22 BP 3955 EP 3961 PG 7 WC Chemistry, Inorganic & Nuclear; Crystallography SC Chemistry; Crystallography GA 148MN UT WOS:000077509300016 ER PT J AU Goldman, M Gronsky, R Long, GG Pruitt, L AF Goldman, M Gronsky, R Long, GG Pruitt, L TI The effects of hydrogen peroxide and sterilization on the structure of ultra high molecular weight polyethylene SO POLYMER DEGRADATION AND STABILITY LA English DT Article AB The effects of hydrogen peroxide and sterilization on the structure and morphology of medical-grade ultra high molecular weight polyethylene (UHMWPE) were studied. Microstructural changes were induced via gamma irradiation sterilization and were accelerated by aging in hydrogen peroxide. Differential scanning calorimetry, density gradient column, transmission electron microscopy and small-angle X-ray scattering were used to characterize the structure. Upon oxidation, a decrease in melting temperature, an increase in heat of fusion, an increase in density, a tortuosity in lamellae, and a tendency to microcrack were observed. Based on the results, a mechanism for the oxidation of UHMWPE is proposed in which oxygen is incorporated into the amorphous phase of the polymer, leading to the development of strains and the breaking of tie molecules in the polymer, which result in the microcracking and embrittlement of the material. (C) 1998 Elsevier Science Limited. All rights reserved. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA. Univ Calif Berkeley, Dept Mat Sci & Mineral Engn, Berkeley, CA 94720 USA. Natl Inst Stand & Technol, Gaithersburg, MD 20899 USA. Univ Calif Berkeley, Dept Mech Engn, Berkeley, CA 94720 USA. RP Goldman, M (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, MS 62-203,1 Cyclotron Rd, Berkeley, CA 94720 USA. NR 18 TC 29 Z9 29 U1 2 U2 5 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND SN 0141-3910 J9 POLYM DEGRAD STABIL JI Polym. Degrad. Stabil. PY 1998 VL 62 IS 1 BP 97 EP 104 DI 10.1016/S0141-3910(97)00265-6 PG 8 WC Polymer Science SC Polymer Science GA 131RH UT WOS:000076588700012 ER PT J AU Celina, M Gillen, KT Clough, RL AF Celina, M Gillen, KT Clough, RL TI Inverse temperature and annealing phenomena during degradation crosslinked polyolefins SO POLYMER DEGRADATION AND STABILITY LA English DT Article ID THERMALLY AGED ELASTOMERS; OXIDATIVE-DEGRADATION; OXIDIZED POLYOLEFINS; AGING DATA; RADIATION; POLYPROPYLENE; POLYETHYLENE; STABILITY; POLYMERS; MODEL AB The radiation-thermal degradation of several types of commercial cable insulation materials (semi-crystalline crosslinked polyolefins) was investigated as a function of temperature in the range of 22-120 degrees C. Mechanical property deterioration surprisingly occurred most rapidly at the lowest temperatures. This unusual phenomenon was corroborated by fundamental differences in the degradation mechanism at elevated and ambient temperatures. Annealing at elevated temperatures of samples that had been aged at or near room temperature led in some cases to significant recovery of mechanical properties (elongation at break) and concurrent changes in gel content (additional crosslinking) and density. The importance of molecular mobility in the semi-crystalline materials and the nature of the additional crosslinking reaction as contributors to these anomalous behaviors are evaluated and discussed. The observed inverse temperature/aging dependence is due to a combination of the semi-crystalline morphology of the materials, and a specific crosslinking reaction, which can act as a repair mechanism at elevated temperatures, but is dormant at ambient conditions. C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. NR 51 TC 20 Z9 21 U1 1 U2 7 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND SN 0141-3910 EI 1873-2321 J9 POLYM DEGRAD STABIL JI Polym. Degrad. Stabil. PY 1998 VL 61 IS 2 BP 231 EP 244 DI 10.1016/S0141-3910(97)00142-0 PG 14 WC Polymer Science SC Polymer Science GA 117FQ UT WOS:000075770600007 ER PT J AU Scurlock, RD Kristiansen, M Ogilby, PR Taylor, VL Clough, RL AF Scurlock, RD Kristiansen, M Ogilby, PR Taylor, VL Clough, RL TI Singlet oxygen reactions in a glassy polystyrene matrix SO POLYMER DEGRADATION AND STABILITY LA English DT Article ID MOLECULAR-OXYGEN; EXCITED SINGLET; PHOTOSENSITIZED FORMATION; RATE CONSTANTS; POLYMER-FILMS; DIFFUSION; O-1(2); PHOTOPEROXIDATION; PHOTODEGRADATION; LUMINESCENCE AB Time-resolved spectroscopic measurements, together with other techniques, have been used to investigate chemical reactions between singlet oxygen (a(1) Delta(g)) and organic molecules (M) in a polystyrene glass at 20 degrees C. The kinetics of these reactions differ from those in liquids, owing to small solute diffusion coefficients in the solid which influence the rates of O-2(a(1) Delta(g)) and M association and dissociation. For molecules that react efficiently with O-2(a(1) Delta(g)), rate constants in the glass are significantly smaller than in liquid toluene, reflecting a decrease in the rate constant of O-2(a(1) Delta(g)) and M association to form an encounter pair. For a poor reactant with O-2(a(1) Delta(g)), however, the overall quenching rate constant in the glass can be larger than in the liquid, which reflects a rate constant for M-O-2(a(1) Delta(g)) dissociation that is smaller, and hence an encounter pair lifetime that is longer, in the polymer. Changes in the rate constant for M-O-2(a(1) Delta(g)) dissociation are also reflected in product quantum yields. Thus, in 'self-sensitized' experiments, in which the molecule that produces O-2(a(1) Delta(g)) also reacts with O2(a(1) Delta(g)), that fraction of the reaction product arising directly from the initial M-O-2(a(1) Delta(g)) encounter pair is much higher in the glass than in the liquid. Furthermore, this intracage reaction is not inhibited by the addition of an O-2(a(1) Delta(g)) physical quencher. These results indicate that, in materials containing small concentrations of additives or impurities capable of undergoing self-sensitized O-2(a(1) Delta(g)) reactions, the quantum yield for oxidation chemistry may be higher in a polymer glass than in a liquid and that added stabilizers may have no effect on the reaction. (C) 1998 Elsevier Science Limited. All rights reserved. C1 Univ New Mexico, Dept Chem, Albuquerque, NM 87131 USA. Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Clough, RL (reprint author), Aarhus Univ, Dept Chem, Langelandsgade 140, DK-8000 Aarhus C, Denmark. NR 54 TC 24 Z9 24 U1 0 U2 7 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND SN 0141-3910 J9 POLYM DEGRAD STABIL JI Polym. Degrad. Stabil. PY 1998 VL 60 IS 1 BP 145 EP 159 DI 10.1016/S0141-3910(97)00062-1 PG 15 WC Polymer Science SC Polymer Science GA ZV359 UT WOS:000074296700015 ER PT J AU Celina, M Wise, J Ottesen, DK Gillen, KT Clough, RL AF Celina, M Wise, J Ottesen, DK Gillen, KT Clough, RL TI Oxidation profiles of thermally aged nitrile rubber SO POLYMER DEGRADATION AND STABILITY LA English DT Article ID CHEMILUMINESCENCE; POLYPROPYLENE; ELASTOMERS; POLYMERS AB The thermal degradation of a commercial, stabilized, unfilled nitrile (Buna-N) rubber material was investigated at temperatures in the range 85-140 degrees C. The resulting heterogeneous oxidation, due to diffusion limitations in oxygen availability, was studied using infrared microscopy and modulus profiling. Degradation-related spectral changes were observed primarily in the hydroxyl, carbonyl and ester regions; quantitative analysis revealed identical oxidation profiles for these chromophores. These chemical oxidation profiles (carbonyl formation) were correlated with mechanical modulus (hardness) profiles. Degradation of the sample proceeds via a linear increase in the carbonyl concentration, but an exponential increase in the modulus with time. It is concluded that the profile development and aging behavior can be described by a diffusion-limited autoxidation mechanism which can be modeled computationally. The results are compared to those of a previously studied carbon-black-filled material. Published by Elsevier Science Limited. C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. Sandia Natl Labs, Livermore, CA 94551 USA. RP Celina, M (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. NR 27 TC 50 Z9 50 U1 2 U2 29 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND SN 0141-3910 J9 POLYM DEGRAD STABIL JI Polym. Degrad. Stabil. PY 1998 VL 60 IS 2-3 BP 493 EP 504 DI 10.1016/S0141-3910(97)00113-4 PG 12 WC Polymer Science SC Polymer Science GA 100KX UT WOS:000074816200036 ER PT J AU Romine, RA Romine, MF AF Romine, RA Romine, MF TI Rubbercycle: a bioprocess for surface modification of waste tyre rubber SO POLYMER DEGRADATION AND STABILITY LA English DT Article; Proceedings Paper CT Symposium H on Biodegradable Polymers and Macromolecules, at the E-MRS 97/ICAM 97 Conference CY JUN 16-19, 1997 CL STRASBOURG, FRANCE SP E MRS, ICAM ID ORGANISM SULFOLOBUS-ACIDOCALDARIUS; DIBENZOTHIOPHENE; DEGRADATION AB Microorganisms exhibiting biological activity towards sulfur were screened for use in producing surface-modified ground tyre rubber (GTR) that exhibits improved compounding characteristics with virgin rubber stocks. The degradation of dibenzothiophene (DBT) was used as a model compound to screen strains of Thiobacillus, Rhodococcus and Sulfolobus. The strains that were capable of degrading the model compounds were studied in more detail in small bench-scale degradation experiments, where the source of organically bound sulfur was finely ground waste tyre rubber (74 micron particle diameter). Ion chromatography (IC), Fourier transform infrared spectroscopy (FT-IR) and X-ray analysis of near-edge surfaces (XANES) were used to chemically characterize process effluents and products of these bioprocesses. IC was used to characterize spent processing media and showed that bound sulfur was released as sulfate ions when the bioreaction was allowed to run to completion, which agrees with the proposed progressive sulfur oxidation degradation model. The surface chemistry of biotreated GTR was characterized by infrared spectroscopy FT-IR and XANES. These analyses revealed that sulfur present in the GTR was oxidized, which corroborates the proposed biodegradative pathway. Physical properties were determined on rubber samples compounded with various loadings of the surface-modified GTR. Results showed significant increases in the tensile strength and elongation properties for compounds containing up to 15% GTR processed with S. acidocaldarius. The results of the screening experiments, bench-scale process optimization studies and physical properties characterization identified Sulfolobus acidocaldarius as the best microorganism to use in developing a commercially viable bioprocess. (C) 1998 Elsevier Science Limited. All rights reserved. C1 Pacific NW Natl Lab, Richland, WA 99352 USA. RP Romine, RA (reprint author), Pacific NW Natl Lab, POB 999,MS-K2-40, Richland, WA 99352 USA. NR 14 TC 25 Z9 36 U1 2 U2 8 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND SN 0141-3910 J9 POLYM DEGRAD STABIL JI Polym. Degrad. Stabil. PY 1998 VL 59 IS 1-3 SI SI BP 353 EP 358 DI 10.1016/S0141-3910(97)00202-4 PG 6 WC Polymer Science SC Polymer Science GA ZR120 UT WOS:000073938300054 ER PT J AU Kurek, B Martinez-Inigo, MJ Artaud, I Hames, BR Lequart, C Monties, B AF Kurek, B Martinez-Inigo, MJ Artaud, I Hames, BR Lequart, C Monties, B TI Structural features of lignin determining its biodegradation by oxidative enzymes and related systems SO POLYMER DEGRADATION AND STABILITY LA English DT Article; Proceedings Paper CT Symposium H on Biodegradable Polymers and Macromolecules, at the E-MRS 97/ICAM 97 Conference CY JUN 16-19, 1997 CL STRASBOURG, FRANCE SP E MRS, ICAM ID CATALYZED OXIDATION; PINE COMPRESSION; THIOACIDOLYSES; DEGRADATION; PEROXIDASE AB Peroxidases and laccases are key enzymes in the lignin biodegradation process. They oxidize phenolic and non-phenolic lignin model compounds into their phenoxy and cation radicals, respectively. Further non-enzymatic evolution lead then to various C-C and ether bond cleavages. Nevertheless, almost no information on the structural alterations undergone in vitro or in situ by lignin after enzymatic catalysis is available. We report here on the molecular structure of lignin oxidized by various (per)oxidasic systems. The oxidizability of phenolic and non-phenolic structures of the guaiacyl and syringyl type in the lignin network will be discussed as well as the modification of the macromolecular properties of the polymer oxidized in situ or in isolated state. (C) 1998 Elsevier Science Limited. All rights reserved. C1 INRA, Chim Biol Lab, F-78850 Thiverval Grignon, France. CNRS, URA400, F-75270 Paris, France. NREL, Ctr Renewable Chem Technol & Mat, Golden, CO 80401 USA. INRA, UPBP, Unite Fractionnement Enzymat, F-51687 Reims, France. RP INRA, Lab Biochim Macromol Vegetales, 2 Esplanade Roland Garros, F-51686 Reims 2, France. EM kurek@reims.inra.fr NR 20 TC 7 Z9 7 U1 1 U2 5 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND SN 0141-3910 EI 1873-2321 J9 POLYM DEGRAD STABIL JI Polym. Degrad. Stabil. PY 1998 VL 59 IS 1-3 SI SI BP 359 EP 364 DI 10.1016/S0141-3910(97)00195-X PG 6 WC Polymer Science SC Polymer Science GA ZR120 UT WOS:000073938300055 ER PT J AU Celina, M Kudoh, H Renk, TJ Gillen, KT Clough, RL AF Celina, M Kudoh, H Renk, TJ Gillen, KT Clough, RL TI Pulsed ion beam irradiation effects on surfaces of polymeric materials SO POLYMERS FOR ADVANCED TECHNOLOGIES LA English DT Article DE radiation effects; polymer radiolysis; ion beam degradation of polymers ID GAS EVOLUTION; POLYCARBONATE; DEGRADATION; ADHESION; FILMS AB Various polymers were irradiated with high energy (similar to 500 keV) carbon and hydrogen ion beams obtained from a high intensity pulsed power source. Energy deposition was in the range of 0.1-5 J/cm(2) during each pulse, and ion penetration was limited to a few microns. The vapid energy deposition (<500 ns) corresponded to a dose rate of approximately 10(12) Gy/s and resulted in a considerable temperature rise in the surface material accompanied by the formation of gaseous radiolysis products in amounts as high as the volume of the surface layer in which they were formed. Analysis by scanning electron microscopy revealed that dramatic changes to the polymer surface had occurred in some (but not all) of the materials, which took the form of extensive porosity or roughening. (C) 1998 John Wiley & Sons, Ltd. C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. Japan Atom Energy Res Inst, Takasaki Radiat Chem Res Estab, Gunma 37012, Japan. RP Clough, RL (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. NR 24 TC 7 Z9 7 U1 0 U2 4 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX PO19 1UD, ENGLAND SN 1042-7147 J9 POLYM ADVAN TECHNOL JI Polym. Adv. Technol. PD JAN PY 1998 VL 9 IS 1 BP 38 EP 44 DI 10.1002/(SICI)1099-1581(199801)9:1<38::AID-PAT732>3.0.CO;2-N PG 7 WC Polymer Science SC Polymer Science GA YU426 UT WOS:000071715900007 ER PT S AU Hoffheins, BS Lauf, RJ McKnight, TE Smith, RR AF Hoffheins, BS Lauf, RJ McKnight, TE Smith, RR BE Akmal, N Usmani, AM TI Design and testing of hydrogen sensors for industrial applications SO POLYMERS IN SENSORS: THEORY AND PRACTICE SE ACS SYMPOSIUM SERIES LA English DT Article; Proceedings Paper CT Symposim on Ploymers in Senrors - Theory and Practice at the 212th National Meeting of the American-Chemical-Society CY AUG 25-29, 1996 CL ORLANDO, FLORIDA SP Amer Chem Soc, Div Ind & Engn Chem AB Many potential applications for hydrogen detectors demand low-cost, low-power devices that are small, reliable, and rugged. A solid-state sensor developed at Oak Ridge National Laboratory has the potential to meet these requirements. The sensor mechanism relies on the well-characterized solubility of hydrogen in palladium. Changes in hydrogen partial pressure can be measured by corresponding changes in the electrical resistance of the sensor's palladium metallization. The sensor is fabricated using traditional thick-film manufacturing practices, which are inexpensive and, more importantly, have inherent design flexibility. We have recently characterized the sensor performance under a range of conditions, including elevated temperature and humidity. We describe these tests and give future directions as to sensor design, mass production considerations, and feasibility in end-use applications. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Hoffheins, BS (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RI McKnight, Tim/H-3087-2011 OI McKnight, Tim/0000-0003-4326-9117 NR 11 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 SIXTEENTH ST NW, WASHINGTON, DC 20036 USA SN 0097-6156 BN 0-8412-3550-3 J9 ACS SYM SER PY 1998 VL 690 BP 90 EP 101 PG 12 WC Chemistry, Multidisciplinary; Instruments & Instrumentation; Polymer Science SC Chemistry; Instruments & Instrumentation; Polymer Science GA BP67B UT WOS:000085821600008 ER PT S AU Swanson, B Johnson, S Shi, J Yang, X AF Swanson, B Johnson, S Shi, J Yang, X BE Akmal, N Usmani, AM TI Cyclodextrin-based microsensors for volatile organic compounds SO POLYMERS IN SENSORS: THEORY AND PRACTICE SE ACS SYMPOSIUM SERIES LA English DT Article; Proceedings Paper CT Symposim on Ploymers in Senrors - Theory and Practice at the 212th National Meeting of the American-Chemical-Society CY AUG 25-29, 1996 CL ORLANDO, FLORIDA SP Amer Chem Soc, Div Ind & Engn Chem ID ULTRATHIN MULTILAYER FILMS; SELF-ASSEMBLY PROCESS; GAS-CHROMATOGRAPHY; CHARGED SURFACES; ADSORPTION; SENSOR; POLYELECTROLYTES; MONOLAYERS; DEVICES; BUILDUP AB Guest-host chemistry and self-assembly techniques are being explored to develop species selective thin-films for real-time sensing of volatile organic compounds (VOCs). Cyclodextrin (CD) and calixarene (CA) molecules are known to form guest-host inclusion complexes with a variety of organic molecules. Through the control of the cavity size and chemical functionality on the rims of these bucket-like molecules, the binding affinities for formation of inclusion complexes can be controlled and optimized for specific molecules. Self-assembly techniques are used to covalently bond these reagent molecules to the surface of acoustic transducers to create dense, highly oriented, and stable thin films. Self-assembly techniques have also been used to fabricate multilayer thin film containing host reagents through alternating adsorption of charged species in aqueous solutions. Self-assembly of polymeric molecules on the SAW device was also explored for fabricating species selective thin films. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Swanson, B (reprint author), Univ Calif Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. NR 24 TC 4 Z9 4 U1 3 U2 5 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 SIXTEENTH ST NW, WASHINGTON, DC 20036 USA SN 0097-6156 BN 0-8412-3550-3 J9 ACS SYM SER PY 1998 VL 690 BP 130 EP 138 PG 9 WC Chemistry, Multidisciplinary; Instruments & Instrumentation; Polymer Science SC Chemistry; Instruments & Instrumentation; Polymer Science GA BP67B UT WOS:000085821600011 ER PT J AU Ranganathan, S Easterling, RG Advani, SG Phelan, FR AF Ranganathan, S Easterling, RG Advani, SG Phelan, FR TI The effect of micro-structure variations on the permeability of preform materials SO POLYMERS & POLYMER COMPOSITES LA English DT Article ID FIBROUS POROUS-MEDIA; FLOW; REINFORCEMENTS; FLUIDS AB Most efforts at modelling the permeability of preform materials are based on unit cell approaches in which it is assumed that the medium consists of a regular array of structures of uniform size, shape and position. However, the microstructure of real materials almost always has some degree of dimensional fluctuation about a mean. These variations from uniformity have an effect on the overall permeability, which in general cannot be adequately accounted for in model calculations by defining unit cells based on average geometric properties. In this study, a method for incorporating the effect of variations in microstructure into model-based calculations of the permeability of an idealized preform structure is developed. The method is used to model the permeability of a unidirectional material. It is shown that the inherent variation in the material microstructure leads to large deviations in the "local" values of the permeability. These variations are quantified using statistical analysis to obtain an expected Value and standard deviation for the permeability. Use of the method leads to a consistent comparison of experimentally measured and numerically computed permeability values. C1 NIST, Div Polymers, Gaithersburg, MD 20899 USA. Univ Delaware, Dept Mech Engn, Newark, DE 19716 USA. NIST, Stat Engn Div, Gaithersburg, MD 20899 USA. Sandia Natl Labs, Albuquerque, NM 87185 USA. NR 12 TC 13 Z9 14 U1 0 U2 0 PU RAPRA TECHNOLOGY LTD PI SHREWSBURY PA SHAWBURY, SHREWSBURY, SHROPS, ENGLAND SY4 4NR SN 0967-3911 J9 POLYM POLYM COMPOS JI Polym. Polym. Compos. PY 1998 VL 6 IS 2 BP 63 EP 73 PG 11 WC Materials Science, Characterization & Testing; Materials Science, Composites; Polymer Science SC Materials Science; Polymer Science GA ZP852 UT WOS:000073795100002 ER PT J AU Sugama, T AF Sugama, T TI Polytetrafluoroethylene-blended polyphenylenesulphide coatings for mitigating corrosion of steel in geothermal environments SO POLYMERS & POLYMER COMPOSITES LA English DT Article ID METAL AB To improve the ability of polyphenylenesulphide (PPS) coatings to protect cold-rolled steel against corrosion in a low pH, hypersaline brine geothermal environment at 200 degrees C, polytetrafluoroethylene (PTFE) was blended into the PPS. Not only does PTFE inhibit hot brine-induced oxidation of PPS surfaces, it provides a less susceptible surface to moisture because of its hydrophobic characteristics, reducing the rate of infiltration of corrosive ionic species through the coating film. However, blending an excessive amount of PTFE into PPS creates two undesirable features, causing the failure of the coatings as corrosion-preventing barriers. One is the development of porous microstructure in the coating layer; the other is the formation of a weak boundary region at the interphase between the blended topcoating and the zinc phosphate precoating. The reason for the latter is the phase separation of PTFE from PPS. C1 Brookhaven Natl Lab, Dept Appl Sci, Energy Efficiency & Conservat Div, Upton, NY 11973 USA. NR 11 TC 6 Z9 7 U1 1 U2 1 PU RAPRA TECHNOLOGY LTD PI SHREWSBURY PA SHAWBURY, SHREWSBURY, SHROPS, ENGLAND SY4 4NR SN 0967-3911 J9 POLYM POLYM COMPOS JI Polym. Polym. Compos. PY 1998 VL 6 IS 6 BP 373 EP 385 PG 13 WC Materials Science, Characterization & Testing; Materials Science, Composites; Polymer Science SC Materials Science; Polymer Science GA 150XK UT WOS:000077691200002 ER PT B AU Berryman, JG AF Berryman, JG BE Thimus, JF Abousleiman, Y Cheng, AHD Coussy, O Detournay, E TI Rocks as poroelastic composites SO POROMECHANICS: A TRIBUTE TO MAURICE A. BIOT LA English DT Proceedings Paper CT Biot Conference on Poromechanics CY SEP 14-16, 1998 CL LOUVAIN LA NEUVE, BELGIUM AB In Blot's theory of poroelasticity, elastic materials contain connected voids or pores and these pores may be filled with fluids under pressure. The fluid pressure then couples to the mechanical effects of stress or strain applied externally to the solid matrix. Eshelby's formula for the response of a single ellipsoidal elastic inclusion in an elastic whole space to a strain imposed at infinity is a very well-known and important result in elasticity. Having a rigorous generalization of Eshelby's results valid for poroelasticity means that the hard part of Eshelby's work tin computing the elliptic integrals needed to evaluate the fourth-rank tensors for inclusions shaped like spheres, oblate and prolate spheroids, needles and disks) can be carried over from elasticity to poroelasticity - and also thermoelasticity - with only trivial modifications. Effective medium theories for poroelastic composites such as rocks can then be formulated easily by analogy to well-established methods used for elastic composites. An identity analogous to Eshelby's classic result has been derived [Physical Review Letters 79:1142-1145 (1997)] for use in these more complex and more realistic problems in rock mechanics analysis. Descriptions df the application of this result as the starting point for new methods of estimation are presented. C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Berryman, JG (reprint author), Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. NR 0 TC 5 Z9 5 U1 0 U2 1 PU A A BALKEMA PUBLISHERS PI LEIDEN PA SCHIPHOLWEG 107C, PO BOX 447, 2316 XC LEIDEN, NETHERLANDS BN 90-5809-003-5 PY 1998 BP 11 EP 16 PG 6 WC Geochemistry & Geophysics; Engineering, Geological; Mechanics SC Geochemistry & Geophysics; Engineering; Mechanics GA BL95L UT WOS:000077273600002 ER PT B AU Bosl, WJ Nur, A AF Bosl, WJ Nur, A BE Thimus, JF Abousleiman, Y Cheng, AHD Coussy, O Detournay, E TI Numerical simulation of postseismic deformation due to pore fluid diffusion SO POROMECHANICS: A TRIBUTE TO MAURICE A. BIOT LA English DT Proceedings Paper CT Biot Conference on Poromechanics CY SEP 14-16, 1998 CL LOUVAIN LA NEUVE, BELGIUM AB Vertical displacement changes following the 1992 Landers earthquake were measured over a period of several years with SAR interferometry. We used computer simulations to investigate the hypothesis that the displacements were caused by pore pressure changes. Time-dependent numerical simulations of elastic deformation in the Landers fault region were done using a poroelastic code. Vertical deformation profiles along three line segments were computed and compared to synthetic aperature radar (SAR) measurements of vertical displacement over the same segments. Reasonable hydrologic and elastic parameters were used in the numerical model to demonstrate that pore pressure changes can account for the observed vertical displacements and relaxation times. C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Bosl, WJ (reprint author), Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. NR 0 TC 3 Z9 3 U1 0 U2 1 PU A A BALKEMA PUBLISHERS PI LEIDEN PA SCHIPHOLWEG 107C, PO BOX 447, 2316 XC LEIDEN, NETHERLANDS BN 90-5809-003-5 PY 1998 BP 23 EP 28 PG 6 WC Geochemistry & Geophysics; Engineering, Geological; Mechanics SC Geochemistry & Geophysics; Engineering; Mechanics GA BL95L UT WOS:000077273600004 ER PT B AU Berge, PA AF Berge, PA BE Thimus, JF Abousleiman, Y Cheng, AHD Coussy, O Detournay, E TI Pore compressibility in rocks SO POROMECHANICS: A TRIBUTE TO MAURICE A. BIOT LA English DT Proceedings Paper CT Biot Conference on Poromechanics CY SEP 14-16, 1998 CL LOUVAIN LA NEUVE, BELGIUM AB The unjacketed pore compressibility in a porous rock is the change in pare volume due to change in pore pressure for constant differential pressure. This parameter affects how the saturated bulk modulus of a rock is related to the drained frame modulus and the pore fluid compressibility. Recent measurements of poroelastic constants and effective medium theories are used to estimate how the pore compressibility depends on effective stress and how uncertainty in the pore compressibility affects uncertainty in Gassmann's equation estimates of the saturated bulk modulus. Results for Berea sandstone and for models of sand-clay mixtures show that the estimate of the change in the saturated bulk modulus due to substitution of different fluids in the rock may differ in size by a factor of two or more if the pore compressibility is approximately equal to the fluid compressibility instead of the grain compressibility In general, the order of magnitude and sign of the pore compressibility cannot be determined from solid and fluid compressibility information alone. C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Berge, PA (reprint author), Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. NR 0 TC 6 Z9 6 U1 0 U2 0 PU A A BALKEMA PUBLISHERS PI LEIDEN PA SCHIPHOLWEG 107C, PO BOX 447, 2316 XC LEIDEN, NETHERLANDS BN 90-5809-003-5 PY 1998 BP 351 EP 356 PG 6 WC Geochemistry & Geophysics; Engineering, Geological; Mechanics SC Geochemistry & Geophysics; Engineering; Mechanics GA BL95L UT WOS:000077273600058 ER PT S AU Goods, SH Neuschwanger, CL Whinnery, LL AF Goods, SH Neuschwanger, CL Whinnery, LL BE Schwartz, DS Shih, DS Evans, AG Wadley, HNG TI Mechanical properties of a structural polyurethane foam and the effect of particulate loading SO POROUS AND CELLULAR MATERIALS FOR STRUCTURE APPLICATIONS SE MATERIALS RESEARCH SOCIETY SYMPOSIUM PROCEEDINGS LA English DT Proceedings Paper CT Materials-Research-Society Symposium on Porous and Cellular Materials for Structural Applications CY APR 13-15, 1998 CL SAN FRANCISCO, CA SP Mat Res Soc, USN, Off Naval Res, NASA, Mat Div, USA, Army Res Off, Mat Sci Div AB The room temperature mechanical properties of a closed-cell, polyurethane encapsulant foam have been measured as a function of foam density. Tests were performed on both unfilled and filler reinforced specimens. Over the range of densities examined, the modulus of the unloaded foam could be described by a power-law relationship with respect to density. This power-law relationship could be explained in terms of the elastic compliance of the cellular structure of the foam using a simple geometric model found in the literature. The collapse stress of the foam was also found to exhibit a power-law relationship with respect to density. Additions of an aluminum powder filler increased the modulus relative to the unfilled foam. C1 Sandia Natl Labs, Livermore, CA 94550 USA. RP Goods, SH (reprint author), Sandia Natl Labs, Livermore, CA 94550 USA. NR 0 TC 2 Z9 2 U1 0 U2 1 PU MATERIALS RESEARCH SOCIETY PI WARRENDALE PA 506 KEYSTONE DRIVE, WARRENDALE, PA 15088-7563 USA SN 0272-9172 BN 1-55899-427-0 J9 MATER RES SOC SYMP P PY 1998 VL 521 BP 15 EP 20 PG 6 WC Materials Science, Multidisciplinary SC Materials Science GA BL94H UT WOS:000077249400002 ER PT S AU Margevicius, RW Stanek, PW Jacobson, LA AF Margevicius, RW Stanek, PW Jacobson, LA BE Schwartz, DS Shih, DS Evans, AG Wadley, HNG TI Effects of thermomechanical processing on the resulting mechanical properties of 6101 aluminum foam SO POROUS AND CELLULAR MATERIALS FOR STRUCTURE APPLICATIONS SE MATERIALS RESEARCH SOCIETY SYMPOSIUM PROCEEDINGS LA English DT Proceedings Paper CT Materials-Research-Society Symposium on Porous and Cellular Materials for Structural Applications CY APR 13-15, 1998 CL SAN FRANCISCO, CA SP Mat Res Soc, USN, Off Naval Res, NASA, Mat Div, USA, Army Res Off, Mat Sci Div AB High porosity aluminum was fabricated in a number of ways. The starting material was a cast 6101 aluminum that had a relative density of 9.8%. The cast aluminum block was compressed by uniaxial, biaxial, and triaxial densification. Uniaxial compression was done at room temperature and 200 degrees C. Biaxial compression was achieved by unidirectional rolling at room temperature and 200 degrees C. Triaxial compression was done by cold isostatic pressing at 3.4, 6.7, and 34 MPa (0.5, 1.0, and 5.0 ksi). Metallography and mechanical test specimens were machined from the processed bars. The mechanical properties showed that the relative yield strength depended both on relative density and processing temperature. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Margevicius, RW (reprint author), Univ Calif Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. NR 0 TC 0 Z9 0 U1 1 U2 1 PU MATERIALS RESEARCH SOCIETY PI WARRENDALE PA 506 KEYSTONE DRIVE, WARRENDALE, PA 15088-7563 USA SN 0272-9172 BN 1-55899-427-0 J9 MATER RES SOC SYMP P PY 1998 VL 521 BP 65 EP 70 PG 4 WC Materials Science, Multidisciplinary SC Materials Science GA BL94H UT WOS:000077249400010 ER PT S AU Bronzini, MS Curlee, TR Leiby, PN Southworth, F Summers, MS AF Bronzini, MS Curlee, TR Leiby, PN Southworth, F Summers, MS GP NAT RES COUNCIL TI Ohio river navigation investment model - Requirements and model design SO PORTS/WATERWAYS MARINE TRANSPORTATION SE TRANSPORTATION RESEARCH RECORD LA English DT Article; Proceedings Paper CT 77th Annual Meeting of the Transportation-Research-Board CY JAN, 1998 CL WASHINGTON, D.C. SP Transportat Res Board AB Oak Ridge National Laboratory is assisting the U.S. Army Corps of Engineers in improving its economic analysis procedures for evaluation of inland waterway investment projects along the Ohio River system. The context and design of an integrated approach to calculating the systemwide benefits from alternative combinations of lock and channel improvements, providing an ability to project the cost savings from proposed waterway improvements in capacity and reliability for up to 50 years into the future, is described. The design contains an in-depth treatment of the levels of risk and uncertainty associated with different multiyear lock and channel improvement plans, including the uncertainty that results from a high degree of interaction between the many different waterway system components. C1 Oak Ridge Natl Lab, Div Energy, Oak Ridge, TN 37831 USA. RP Bronzini, MS (reprint author), Oak Ridge Natl Lab, Div Energy, POB 2008, Oak Ridge, TN 37831 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU NATL ACAD SCI PI WASHINGTON PA 2101 CONSTITUTION AVE, WASHINGTON, DC 20418 USA SN 0361-1981 BN 0-309-06465-1 J9 TRANSPORT RES REC PY 1998 IS 1620 BP 17 EP 26 PG 10 WC Engineering, Marine; Engineering, Civil; Transportation SC Engineering; Transportation GA BN47V UT WOS:000081981800004 ER PT J AU Alexandrov, IV Zhu, YT Lowe, TC Valiev, RZ AF Alexandrov, IV Zhu, YT Lowe, TC Valiev, RZ TI Severe plastic deformation: new technique for powder consolidation and grain size refinement SO POWDER METALLURGY LA English DT Article C1 Ufa State Aviat Tech Univ, Inst Phys Adv Mat, Ufa 450000, Russia. Univ Calif Los Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USA. RP Alexandrov, IV (reprint author), Ufa State Aviat Tech Univ, Inst Phys Adv Mat, K Marksa 12, Ufa 450000, Russia. RI Zhu, Yuntian/B-3021-2008 OI Zhu, Yuntian/0000-0002-5961-7422 NR 3 TC 14 Z9 15 U1 0 U2 5 PU INST MATERIALS PI LONDON PA 1 CARLTON HOUSE TERRACE, LONDON SW1Y 5DB, ENGLAND SN 0032-5899 J9 POWDER METALL JI Powder Metall. PY 1998 VL 41 IS 1 BP 11 EP 13 PG 3 WC Metallurgy & Metallurgical Engineering SC Metallurgy & Metallurgical Engineering GA ZL491 UT WOS:000073438600027 ER PT J AU Branagan, DJ Burch, JV Sellers, CH Hyde, TA AF Branagan, DJ Burch, JV Sellers, CH Hyde, TA TI Processing of Nd-Fe-B alloys by inert gas atomisation SO POWDER METALLURGY LA English DT Article ID ND2FE14B SYSTEM AB Through a metallurgical approach to alloy design, advanced Nd-Fe-B alloys were developed which formed nanocrystalline composite microstructures after devitrification. Atomisation processing of these new alloys resulted in significant improvements in hard magnetic properties over previous alloys, allowing the possibility of high volume, low cost production by atomisation methods. C1 Idaho Natl Engn & Environm Lab, Idaho Falls, ID 83415 USA. GA Powders LLC, Idaho Falls, ID 83404 USA. RP Branagan, DJ (reprint author), Idaho Natl Engn & Environm Lab, POB 1625, Idaho Falls, ID 83415 USA. NR 8 TC 0 Z9 2 U1 1 U2 1 PU INST MATERIALS PI LONDON PA 1 CARLTON HOUSE TERRACE, LONDON SW1Y 5DB, ENGLAND SN 0032-5899 J9 POWDER METALL JI Powder Metall. PY 1998 VL 41 IS 3 BP 165 EP 167 PG 3 WC Metallurgy & Metallurgical Engineering SC Metallurgy & Metallurgical Engineering GA 130PV UT WOS:000076529700030 ER PT B AU Tolbert, LM Peng, FZ Habetler, TG AF Tolbert, LM Peng, FZ Habetler, TG GP IEEE IEEE TI Multilevel inverters for electric vehicle applications SO POWER ELECTRONICS IN TRANSPORTATION LA English DT Proceedings Paper CT Workshop on Power Electronics in Transportation CY OCT 22-23, 1998 CL DEARBORN, MI SP Power Electron Soc, SE Michigan Sect, IEEE AB This paper presents multilevel inverters as an application for all-electric vehicle (EV) and hybrid-electric vehicle (HEV) motor drives. Diode-clamped inverters and cascaded H-bridge inverters, (1) can generate near-sinusoidal voltages with only fundamental frequency switching; (2) have almost no electromagnetic interference (EMI) and common-mode voltage; and (3) make an EV more accessible/safer and open wiring possible for most of an EV's power system. This paper explores the benefits and discusses control schemes of the cascade inverter for use as an EV motor drive or a parallel HEV drive and the diode-clamped inverter as a series HEV motor drive. Analytical, simulated, and experimental results shaw the superiority of these multilevel inverters for this new niche. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Tolbert, LM (reprint author), Oak Ridge Natl Lab, POB 2009, Oak Ridge, TN 37831 USA. OI Tolbert, Leon/0000-0002-7285-609X NR 0 TC 25 Z9 26 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4398-0 PY 1998 BP 79 EP 84 DI 10.1109/PET.1998.731062 PG 6 WC Engineering, Electrical & Electronic; Transportation SC Engineering; Transportation GA BM08C UT WOS:000077558300010 ER PT B AU Hsu, JS AF Hsu, JS GP IEEE IEEE TI Soft commutated direct current motor SO POWER ELECTRONICS IN TRANSPORTATION LA English DT Proceedings Paper CT Workshop on Power Electronics in Transportation CY OCT 22-23, 1998 CL DEARBORN, MI SP Power Electron Soc, SE Michigan Sect, IEEE AB A novel soft commutated direct current (DC) motor is introduced. The current of the commutated coil is intentionally drained before the brush disconnects the coil. This prevents the spark generation that normally occurs in conventional DC motors. A similar principle can be applied for DC generators. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Hsu, JS (reprint author), Oak Ridge Natl Lab, POB 2009, Oak Ridge, TN 37831 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 0-7803-4398-0 PY 1998 BP 95 EP 102 DI 10.1109/PET.1998.731064 PG 8 WC Engineering, Electrical & Electronic; Transportation SC Engineering; Transportation GA BM08C UT WOS:000077558300012 ER PT S AU Shul, RJ Vawter, GA Willison, CG Bridges, MM Lee, JW Pearton, SJ Abernathy, CR AF Shul, RJ Vawter, GA Willison, CG Bridges, MM Lee, JW Pearton, SJ Abernathy, CR BE Pearton, SJ Shul, RJ Wolfgang, E Ren, F Tenconi, S TI Comparison of dry-etch techniques for GaN, InN, and AlN SO POWER SEMICONDUCTOR MATERIALS AND DEVICES SE MATERIALS RESEARCH SOCIETY SYMPOSIUM PROCEEDINGS LA English DT Proceedings Paper CT Symposium on Power Semiconductor Materials and Devices CY DEC 01-04, 1997 CL BOSTON, MA SP Mat Res Soc AB Fabrication of group-III nitride devices relies on the ability to pattern features to depths ranging from similar to 1000 Angstrom to > 5 mu m with anisotropic profiles, smooth morphologies, selective etching of one material over another, and a low degree of plasma-induced damage. In this study, GaN etch rates and etch profiles are compared using reactive ion etch (RIE), reactive ion beam etching (RIBE), electron cyclotron resonance (ECR), and inductively coupled plasma (ICP) etch systems. RTE yielded the slowest etch rates and sloped etch profiles despite de-biases > -900 V. ECR and ICP etching yielded the highest rates with anisotropic profiles due to their high plasma flux and the ability to control ion energies independently of plasma density. RIBE etch results also showed anisotropic profiles with slower etch rates than either ECR or ICP possibly due to lower ion flux. InN and AlN etch characteristics are also compared using ICP and RIBE. C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Shul, RJ (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU MATERIALS RESEARCH SOCIETY PI WARRENDALE PA 506 KEYSTONE DRIVE, WARRENDALE, PA 15088-7563 USA SN 0272-9172 BN 1-55899-388-6 J9 MATER RES SOC SYMP P PY 1998 VL 483 BP 103 EP 109 PG 7 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary SC Engineering; Materials Science GA BK73W UT WOS:000073286800012 ER PT S AU Shul, RJ Willison, CG Bridges, MM Han, J Lee, JW Pearton, SJ Abernathy, CR MacKenzie, JD Donovan, SM AF Shul, RJ Willison, CG Bridges, MM Han, J Lee, JW Pearton, SJ Abernathy, CR MacKenzie, JD Donovan, SM BE Pearton, SJ Shul, RJ Wolfgang, E Ren, F Tenconi, S TI Selective etching of wide bandgap nitrides SO POWER SEMICONDUCTOR MATERIALS AND DEVICES SE MATERIALS RESEARCH SOCIETY SYMPOSIUM PROCEEDINGS LA English DT Proceedings Paper CT Symposium on Power Semiconductor Materials and Devices CY DEC 01-04, 1997 CL BOSTON, MA SP Mat Res Soc AB High-density plasma etching has been an effective patterning technique for the group-III nitrides due to ion fluxes which are 2 to 4 orders of magnitude higher than more conventional reactive ion etch (RIE) systems. GaN etch rates exceeding 0.68 mu m/min have been reported in Cl-2/H-2/Ar inductively coupled plasmas (ICP) at -280 V de-bias. Under these conditions, the etch mechanism is dominated by ion bombardment energies which can induce damage and minimize etch selectivity. High selectivity etch processes are often necessary for heterostructure devices which are becoming more prominent as growth techniques improve. In this study, we will report high-density ICP etch rates and selectivities for GaN, AIN, and InN as a function of cathode power, ICP-source power, and chamber pressure. GaN:AIN selectivities > 8:1 were observed in a Cl-2/Ar plasma at 10 mTorr pressure, 500 W ICP-source power, and 130 W cathode rf-power, while the GaN:InN selectivity was optimized at similar to 6.5:1 at 5 mTorr, 500 W ICP-source power, and 130 W cathode rf-power. C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Shul, RJ (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. NR 0 TC 3 Z9 3 U1 0 U2 0 PU MATERIALS RESEARCH SOCIETY PI WARRENDALE PA 506 KEYSTONE DRIVE, WARRENDALE, PA 15088-7563 USA SN 0272-9172 BN 1-55899-388-6 J9 MATER RES SOC SYMP P PY 1998 VL 483 BP 155 EP 161 PG 7 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary SC Engineering; Materials Science GA BK73W UT WOS:000073286800019 ER PT S AU Gardner, TJ McLaughlin, LI Evans, LR Datye, AK AF Gardner, TJ McLaughlin, LI Evans, LR Datye, AK BE Delmon, B Jacobs, PA Maggi, R Martens, JA Grange, P Poncelet, G TI Preparation and evaluation of novel Hydrous Metal Oxide (HMO)-supported noble metal catalysts SO PREPARATION OF CATALYSTS VII SE Studies in Surface Science and Catalysis LA English DT Article; Proceedings Paper CT 7th International Symposium on Scientific Bases for the Preparation of Heterogeneous Catalysts CY SEP 01-04, 1998 CL LOUVAIN LA NEUVE, BELGIUM SP Unite Catalyse & Chim Mat Divises, Ctr Surface Chem & Catalysis ID SUPPORT INTERACTION; NORMAL-BUTANE; N-BUTANE; HYDROGENOLYSIS; RH/TIO2; REVERSIBILITY; REDUCTION; BEHAVIOR; IRIDIUM; RHODIUM AB Hydrous Metal Oxides (HMOs) are chemically synthesized materials that, because of their high cation exchange capacity, possess a unique ability to allow the preparation of highly dispersed supported-metal catalyst precursors with high metal loadings. This study evaluates high weight loading Rh/HMO catalysts with a wide range of HMO support compositions, including hydrous titanium oxide (HTO), silica-doped hydrous titanium oxide (HTO:Si), hydrous zirconium oxide (HZO), and silica-doped hydrous zirconium oxide (HZO:Si), against conventional oxide-supported Rh catalysts with similar weight loadings and support chemistries. Catalyst activity measurements for a structure-sensitive model reaction (n-butane hydrogenolysis) as a function of catalyst activation conditions show superior activity and stability for the ZrO2, HZO, and HZO:Si supports, although all of the Rh/HMO catalysts have high ethane selectivity indicative of high Rh dispersion. For the TiO2-, HTO-, and HTO:Si-supported Rh catalysts, a significant loss of both catalyst activity and Rh dispersion is observed at more aggressive activation conditions, consistent with TiOx migration associated with SMSI phenomena. Of all the Rh/HMO catalysts, the Rh/HZO:Si catalysts appear to offer the best tradeoff in terms of high Rh dispersion, high activity, and high selectivity. C1 Sandia Natl Labs, Catalysis & Chem Technol Dept, Albuquerque, NM 87185 USA. Univ New Mexico, Dept Chem Engn, Albuquerque, NM 87131 USA. Univ New Mexico, Ctr Microengn Mat, Albuquerque, NM 87131 USA. RP Sandia Natl Labs, Catalysis & Chem Technol Dept, POB 5800, Albuquerque, NM 87185 USA. OI Datye, Abhaya/0000-0002-7126-8659 NR 31 TC 0 Z9 0 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA SARA BURGERHARTSTRAAT 25, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-2991 BN 0-444-50031-6 J9 STUD SURF SCI CATAL PY 1998 VL 118 BP 245 EP 254 PG 10 WC Chemistry, Physical SC Chemistry GA BL66W UT WOS:000076264000026 ER PT S AU Jackson, NB Thoma, SG Kohler, S Nenoff, TM AF Jackson, NB Thoma, SG Kohler, S Nenoff, TM BE Delmon, B Jacobs, PA Maggi, R Martens, JA Grange, P Poncelet, G TI Zirconium-titanium phosphate acid catalysts synthesized by sol gel techniques SO PREPARATION OF CATALYSTS VII SE STUDIES IN SURFACE SCIENCE AND CATALYSIS LA English DT Article; Proceedings Paper CT 7th International Symposium on Scientific Bases for the Preparation of Heterogeneous Catalysts CY SEP 01-04, 1998 CL LOUVAIN LA NEUVE, BELGIUM SP Unite Catalyse & Chim Mat Divises, Ctr Surface Chem & Catalysis ID OLEFIN ISOMERIZATION; SULFATED-ZIRCONIA; MECHANISM AB Recently a large effort has been put into identifying solid acid materials, particularly sulfated zirconia and other sulfated metal oxides, that can be used to replace environmentally hazardous liquid acids in industrial processes. We are studying a group of mixed metal phosphates, some of which have also been sulfated, for their catalytic and morphological characteristics. Zirconium and titanium are the metals used in this study and the catalysts are synthesized from alkoxide starting materials with H3PO4, H2O, and sometimes H2SO4 as gelling agents. The measurement of acidity was achieved by using the isomerization of an olefin as a model reaction. The phosphate stabilized the mixed metal sulfates, preventing them from calcining to oxides boosting their initial catalytic activity. The addition of sulfate prevented the formation of the catalytically inactive mixed metal pyrophosphates when calcined at high temperatures (>773 K). C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Jackson, NB (reprint author), Sandia Natl Labs, POB 5800,MS 0710, Albuquerque, NM 87185 USA. NR 13 TC 1 Z9 1 U1 0 U2 2 PU ELSEVIER SCIENCE PUBL B V PI AMSTERDAM PA SARA BURGERHARTSTRAAT 25, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-2991 BN 0-444-50031-6 J9 STUD SURF SCI CATAL PY 1998 VL 118 BP 643 EP 649 PG 7 WC Chemistry, Physical SC Chemistry GA BL66W UT WOS:000076264000069 ER PT J AU Ramirez-Vick, JE Garcia, AA Lee, J AF Ramirez-Vick, JE Garcia, AA Lee, J TI Recovery of an oligonucleotide using silver ions immobilized onto paramagnetic particles SO PREPARATIVE BIOCHEMISTRY & BIOTECHNOLOGY LA English DT Article ID CHROMATOGRAPHY AB A 3 '-GCCCCTTTTTAAAAACCCCG-5' oligonucleotide can be recovered from aqueous solution using paramagnetic particles containing immobilized silver ions. Binding and elution experiments were conducted by attaching either fluorescein isothioocyanate (FITC) to the 3'-end or Texas Red or fluorescein phosphoramidite (FAM) to the 5'-end of the oligonucleotide. For the 5'-end FAM labeled oligonucleotide, a binding constant of 4.2 x 10(7) was measured at pH 7 using phosphate buffer. The percent of bound FAM labeled oligonucleotide eluted from the paramagnetic particles was found to be 97% using an aqueous solution of thiodiglycol. While the FAM molecule by itself does not bind to the silver activated paramagnetic particles, the choice of fluorescent label affects binding affinities and elution recoveries. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. Arizona State Univ, Dept Chem Bio & Mat Engn, Tempe, AZ 85287 USA. Mayo Clin Scottsdale, Scottsdale, AZ 85259 USA. RP Ramirez-Vick, JE (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. OI Ramirez-Vick, Jaime/0000-0001-9845-3734 NR 10 TC 0 Z9 0 U1 0 U2 0 PU MARCEL DEKKER INC PI NEW YORK PA 270 MADISON AVE, NEW YORK, NY 10016 USA SN 1082-6068 J9 PREP BIOCHEM BIOTECH JI Prep. Biochem. Biotechnol. PY 1998 VL 28 IS 3 BP 243 EP 260 DI 10.1080/10826069808010139 PG 18 WC Biochemical Research Methods; Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology GA 116NR UT WOS:000075731900004 PM 9710897 ER PT B AU Forester, JA Kiper, K Ramey-Smith, A AF Forester, JA Kiper, K Ramey-Smith, A BE Mosleh, A Bari, RA TI Application of a new Technique for Human Event Analysis (ATHEANA) at a pressurized-water reactor SO PROBABILISTIC SAFETY ASSESSMENT AND MANAGEMENT (PSAM 4), VOLS 1-4 LA English DT Proceedings Paper CT 4th International Conference on Probabilistic Safety Assessment and Management CY SEP 13-18, 1998 CL NEW YORK, NY SP Int Assoc Probabilist Safety Assessment & Management, Amer Inst Chem Engineers, Amer Nucl Soc, Amer Soc Civil Engineers, Amer Soc Mech Engineers, Atom Energy Soc Japan, European Nucl Soc, European Safety & Reliabil Assoc, Fed Aviat Adm, Human Factors Soc, Inst Elect & Electr Engineers, Int Atom Energy Agcy, European Union, Joint Res Ctr, NASA, Org Econ Cooperat & Dev, Soc Risk Analy, Syst Safety Soc, UK Safety & Reliabil Soc, US Coast Guard, US DOE, US Nucl Regulatory Commiss, Associated Univ Inc, Beta Corp Int, BOOZ ALLEN & HAMILTON Inc, Brookhaven Sci Associates, ERIN Engn & Res Inc, PLG Inc, Sci Applicat Int Corp, SCIENTECH INC, Univ Maryland, Ctr Technol Risk Stud C1 Sandia Natl Labs, Livermore, CA 94550 USA. RP Forester, JA (reprint author), Sandia Natl Labs, Livermore, CA 94550 USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER-VERLAG LONDON LTD PI GODALMING PA SWEETAPPLE HOUSE CATTESHALL RD FARNCOMBE, GODALMING GU7 1NH, SURREY, ENGLAND BN 3-540-76262-0 PY 1998 BP 117 EP 122 PG 6 WC Engineering, Multidisciplinary; Multidisciplinary Sciences SC Engineering; Science & Technology - Other Topics GA BP34L UT WOS:000084758100018 ER PT B AU Marshall, FM Rasmuson, DM Mosleh, A AF Marshall, FM Rasmuson, DM Mosleh, A BE Mosleh, A Bari, RA TI Common cause failure susceptibilities at nuclear power plants SO PROBABILISTIC SAFETY ASSESSMENT AND MANAGEMENT (PSAM 4), VOLS 1-4 LA English DT Proceedings Paper CT 4th International Conference on Probabilistic Safety Assessment and Management CY SEP 13-18, 1998 CL NEW YORK, NY SP Int Assoc Probabilist Safety Assessment & Management, Amer Inst Chem Engineers, Amer Nucl Soc, Amer Soc Civil Engineers, Amer Soc Mech Engineers, Atom Energy Soc Japan, European Nucl Soc, European Safety & Reliabil Assoc, Fed Aviat Adm, Human Factors Soc, Inst Elect & Electr Engineers, Int Atom Energy Agcy, European Union, Joint Res Ctr, NASA, Org Econ Cooperat & Dev, Soc Risk Analy, Syst Safety Soc, UK Safety & Reliabil Soc, US Coast Guard, US DOE, US Nucl Regulatory Commiss, Associated Univ Inc, Beta Corp Int, BOOZ ALLEN & HAMILTON Inc, Brookhaven Sci Associates, ERIN Engn & Res Inc, PLG Inc, Sci Applicat Int Corp, SCIENTECH INC, Univ Maryland, Ctr Technol Risk Stud AB This paper presents a discussion of several events contained within the common cause failure event database developed by the U.S. Nuclear Regulatory Commission's Office for Analysis and Evaluation of Operational Data and the Idaho National Engineering and Environmental Laboratory. The discussion focuses on the inability to completely eliminate dependent equipment failures from nuclear power plant design. In addition, by use of actual operating plant examples, it serves to illustrate the term common cause failure, to allow for consistent use of the term throughout the risk analysis industry. C1 Lockheed Martin Idaho Technol Co, Idaho Natl Engn & Environm Lab, Idaho Falls, ID 83415 USA. RP Marshall, FM (reprint author), Lockheed Martin Idaho Technol Co, Idaho Natl Engn & Environm Lab, Idaho Falls, ID 83415 USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER-VERLAG LONDON LTD PI GODALMING PA SWEETAPPLE HOUSE CATTESHALL RD FARNCOMBE, GODALMING GU7 1NH, SURREY, ENGLAND BN 3-540-76262-0 PY 1998 BP 213 EP 218 PG 6 WC Engineering, Multidisciplinary; Multidisciplinary Sciences SC Engineering; Science & Technology - Other Topics GA BP34L UT WOS:000084758100033 ER PT B AU Carlson, DD Jones, TR AF Carlson, DD Jones, TR BE Mosleh, A Bari, RA TI Model-based safety assessments SO PROBABILISTIC SAFETY ASSESSMENT AND MANAGEMENT (PSAM 4), VOLS 1-4 LA English DT Proceedings Paper CT 4th International Conference on Probabilistic Safety Assessment and Management CY SEP 13-18, 1998 CL NEW YORK, NY SP Int Assoc Probabilist Safety Assessment & Management, Amer Inst Chem Engineers, Amer Nucl Soc, Amer Soc Civil Engineers, Amer Soc Mech Engineers, Atom Energy Soc Japan, European Nucl Soc, European Safety & Reliabil Assoc, Fed Aviat Adm, Human Factors Soc, Inst Elect & Electr Engineers, Int Atom Energy Agcy, European Union, Joint Res Ctr, NASA, Org Econ Cooperat & Dev, Soc Risk Analy, Syst Safety Soc, UK Safety & Reliabil Soc, US Coast Guard, US DOE, US Nucl Regulatory Commiss, Associated Univ Inc, Beta Corp Int, BOOZ ALLEN & HAMILTON Inc, Brookhaven Sci Associates, ERIN Engn & Res Inc, PLG Inc, Sci Applicat Int Corp, SCIENTECH INC, Univ Maryland, Ctr Technol Risk Stud AB Sandia National Laboratories performs systems analysis of high risk, high consequence systems. In particular, Sandia is responsible for the engineering of nuclear weapons, exclusive of the explosive physics package. In meeting this responsibility, Sandia has developed fundamental approaches to safety and a process for evaluating safety based on modeling and simulation. These approaches provide confidence in the safety of our nuclear weapons. Similar concepts may be applied to improve the safety of other high consequence systems. C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Carlson, DD (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER-VERLAG LONDON LTD PI GODALMING PA SWEETAPPLE HOUSE CATTESHALL RD FARNCOMBE, GODALMING GU7 1NH, SURREY, ENGLAND BN 3-540-76262-0 PY 1998 BP 247 EP 252 PG 6 WC Engineering, Multidisciplinary; Multidisciplinary Sciences SC Engineering; Science & Technology - Other Topics GA BP34L UT WOS:000084758100038 ER PT B AU Cadwallader, LC Taylor, NP Poucet, AE AF Cadwallader, LC Taylor, NP Poucet, AE BE Mosleh, A Bari, RA TI Preliminary Master Logic Diagram for ITER operation SO PROBABILISTIC SAFETY ASSESSMENT AND MANAGEMENT (PSAM 4), VOLS 1-4 LA English DT Proceedings Paper CT 4th International Conference on Probabilistic Safety Assessment and Management CY SEP 13-18, 1998 CL NEW YORK, NY SP Int Assoc Probabilist Safety Assessment & Management, Amer Inst Chem Engineers, Amer Nucl Soc, Amer Soc Civil Engineers, Amer Soc Mech Engineers, Atom Energy Soc Japan, European Nucl Soc, European Safety & Reliabil Assoc, Fed Aviat Adm, Human Factors Soc, Inst Elect & Electr Engineers, Int Atom Energy Agcy, European Union, Joint Res Ctr, NASA, Org Econ Cooperat & Dev, Soc Risk Analy, Syst Safety Soc, UK Safety & Reliabil Soc, US Coast Guard, US DOE, US Nucl Regulatory Commiss, Associated Univ Inc, Beta Corp Int, BOOZ ALLEN & HAMILTON Inc, Brookhaven Sci Associates, ERIN Engn & Res Inc, PLG Inc, Sci Applicat Int Corp, SCIENTECH INC, Univ Maryland, Ctr Technol Risk Stud AB This paper describes the work performed to develop a Master Logic Diagram (MLD) for the operations phase of the International Thermonuclear Experimental Reactor (ITER).(1) The MLD is a probabilistic risk assessment tool used to identify the broad set of potential initiating events that could lead to an offsite radioactive or toxic chemical release from the facility under study. The MLD described here is complementary to the failure modes and effects analyses (FMEAs) that have been performed for ITER's major plant systems(2) in the engineering evaluation of the facility design. While the FMEAs are a bottom-up or 'component level' approach, the MLD is a top-down or 'facility level' approach to identifying the broad spectrum of potential events. Strengths of the MLD are that it analyzes the entire plant, depicts completeness in the accident initiator process, provides an independent method for identification, and can also identify potential system interactions. MLDs have been used successfully as a hazard analysis tool.(3) . This paper describes the process used for the ITER MLD to treat the variety of radiological and toxicological source terms present in the ITER design. One subtree of the nineteen page MLD is shown to illustrate the levels of the diagram. C1 INEEL, Idaho Falls, ID 83415 USA. RP Cadwallader, LC (reprint author), INEEL, POB 1625, Idaho Falls, ID 83415 USA. RI Cadwallader, Lee/F-6933-2014 NR 6 TC 1 Z9 1 U1 0 U2 0 PU SPRINGER-VERLAG LONDON LTD PI GODALMING PA SWEETAPPLE HOUSE CATTESHALL RD FARNCOMBE, GODALMING GU7 1NH, SURREY, ENGLAND BN 3-540-76262-0 PY 1998 BP 253 EP 258 PG 6 WC Engineering, Multidisciplinary; Multidisciplinary Sciences SC Engineering; Science & Technology - Other Topics GA BP34L UT WOS:000084758100039 ER PT B AU O'Brien, D Fischer, SR Clement, S AF O'Brien, D Fischer, SR Clement, S BE Mosleh, A Bari, RA TI Discussion of nuclear explosive operation process changes generated by a preliminary hazard assessment SO PROBABILISTIC SAFETY ASSESSMENT AND MANAGEMENT (PSAM 4), VOLS 1-4 LA English DT Proceedings Paper CT 4th International Conference on Probabilistic Safety Assessment and Management CY SEP 13-18, 1998 CL NEW YORK, NY SP Int Assoc Probabilist Safety Assessment & Management, Amer Inst Chem Engineers, Amer Nucl Soc, Amer Soc Civil Engineers, Amer Soc Mech Engineers, Atom Energy Soc Japan, European Nucl Soc, European Safety & Reliabil Assoc, Fed Aviat Adm, Human Factors Soc, Inst Elect & Electr Engineers, Int Atom Energy Agcy, European Union, Joint Res Ctr, NASA, Org Econ Cooperat & Dev, Soc Risk Analy, Syst Safety Soc, UK Safety & Reliabil Soc, US Coast Guard, US DOE, US Nucl Regulatory Commiss, Associated Univ Inc, Beta Corp Int, BOOZ ALLEN & HAMILTON Inc, Brookhaven Sci Associates, ERIN Engn & Res Inc, PLG Inc, Sci Applicat Int Corp, SCIENTECH INC, Univ Maryland, Ctr Technol Risk Stud AB Hazard assessments (HAs) are being used to support the US Department of Energy (DOE) Integrated Safety Process (SS-21), Nuclear Explosive Safety Study Group (NESSG), and Environmental Safety and Health (ES&H) initiatives. The HAs are used to identify hazards associated with nuclear explosive operations involving tooling and procedural processes. In general, a HA is a formal, systematic, in-depth method for evaluating a set of possible accident scenarios associated with a process. Two assessments of a nuclear explosive surveillance process have been performed or are in progress: (1) a preliminary HA of current operations to focus efforts on maximizing safety improvements during subsequent process redesign and track overall improvement following process redesign (completed) and (2) a rolling assessment of hazards present in conceptual designs and solutions to improve safety tin progress). The preliminary HA was used to focus the process design teams on problem areas. The rolling assessment is evaluating how well problem areas were eliminated or mitigated. This paper will summarize the preliminary HA, how it focused the design teams on problem areas found by the assessment, and the rolling assessment of solutions generated by the process design team. C1 Univ Calif Los Alamos Natl Lab, Probabilist Risk & Hazard Anal Grp, Los Alamos, NM 87545 USA. RP O'Brien, D (reprint author), Univ Calif Los Alamos Natl Lab, Probabilist Risk & Hazard Anal Grp, Los Alamos, NM 87545 USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER-VERLAG LONDON LTD PI GODALMING PA SWEETAPPLE HOUSE CATTESHALL RD FARNCOMBE, GODALMING GU7 1NH, SURREY, ENGLAND BN 3-540-76262-0 PY 1998 BP 266 EP 271 PG 6 WC Engineering, Multidisciplinary; Multidisciplinary Sciences SC Engineering; Science & Technology - Other Topics GA BP34L UT WOS:000084758100041 ER PT B AU Smith, RE Booker, JM Bement, TR Parkinson, WJ Meyer, MA Jamashidi, M AF Smith, RE Booker, JM Bement, TR Parkinson, WJ Meyer, MA Jamashidi, M BE Mosleh, A Bari, RA TI The use of fuzzy control system methods for characterizing expert judgment uncertainty distributions SO PROBABILISTIC SAFETY ASSESSMENT AND MANAGEMENT (PSAM 4), VOLS 1-4 LA English DT Proceedings Paper CT 4th International Conference on Probabilistic Safety Assessment and Management CY SEP 13-18, 1998 CL NEW YORK, NY SP Int Assoc Probabilist Safety Assessment & Management, Amer Inst Chem Engineers, Amer Nucl Soc, Amer Soc Civil Engineers, Amer Soc Mech Engineers, Atom Energy Soc Japan, European Nucl Soc, European Safety & Reliabil Assoc, Fed Aviat Adm, Human Factors Soc, Inst Elect & Electr Engineers, Int Atom Energy Agcy, European Union, Joint Res Ctr, NASA, Org Econ Cooperat & Dev, Soc Risk Analy, Syst Safety Soc, UK Safety & Reliabil Soc, US Coast Guard, US DOE, US Nucl Regulatory Commiss, Associated Univ Inc, Beta Corp Int, BOOZ ALLEN & HAMILTON Inc, Brookhaven Sci Associates, ERIN Engn & Res Inc, PLG Inc, Sci Applicat Int Corp, SCIENTECH INC, Univ Maryland, Ctr Technol Risk Stud C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87544 USA. RP Smith, RE (reprint author), Univ Calif Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87544 USA. NR 6 TC 1 Z9 1 U1 0 U2 0 PU SPRINGER-VERLAG LONDON LTD PI GODALMING PA SWEETAPPLE HOUSE CATTESHALL RD FARNCOMBE, GODALMING GU7 1NH, SURREY, ENGLAND BN 3-540-76262-0 PY 1998 BP 497 EP 502 PG 6 WC Engineering, Multidisciplinary; Multidisciplinary Sciences SC Engineering; Science & Technology - Other Topics GA BP34L UT WOS:000084758100076 ER PT B AU Houghton, FK Morzinski, J AF Houghton, FK Morzinski, J BE Mosleh, A Bari, RA TI Integration of human reliability analysis into the high consequence process SO PROBABILISTIC SAFETY ASSESSMENT AND MANAGEMENT (PSAM 4), VOLS 1-4 LA English DT Proceedings Paper CT 4th International Conference on Probabilistic Safety Assessment and Management CY SEP 13-18, 1998 CL NEW YORK, NY SP Int Assoc Probabilist Safety Assessment & Management, Amer Inst Chem Engineers, Amer Nucl Soc, Amer Soc Civil Engineers, Amer Soc Mech Engineers, Atom Energy Soc Japan, European Nucl Soc, European Safety & Reliabil Assoc, Fed Aviat Adm, Human Factors Soc, Inst Elect & Electr Engineers, Int Atom Energy Agcy, European Union, Joint Res Ctr, NASA, Org Econ Cooperat & Dev, Soc Risk Analy, Syst Safety Soc, UK Safety & Reliabil Soc, US Coast Guard, US DOE, US Nucl Regulatory Commiss, Associated Univ Inc, Beta Corp Int, BOOZ ALLEN & HAMILTON Inc, Brookhaven Sci Associates, ERIN Engn & Res Inc, PLG Inc, Sci Applicat Int Corp, SCIENTECH INC, Univ Maryland, Ctr Technol Risk Stud AB When performing a hazards analysis (HA) for a high consequence process, human error often plays a significant role in the hazards analysis. In order to integrate human error into the hazards analysis, a human reliability analysis (HRA) is performed. Human reliability is the probability that a person will correctly perform a system-required activity in a required time period and will perform no extraneous activity that will affect the correct performance. Even though human error is a very complex subject that can only approximately be addressed in risk assessment, an attempt must be made to estimate the effect of human errors. The HRA provides data that can be incorporated in the hazard analysis event. This paper will discuss the integration of HRA into a HA for the disassembly of a high explosive component. The process was designed to use a retaining fixture to hold the high explosive in place during a rotation of the component. This tool was designed as a redundant safety feature to help prevent a drop of the explosive. This paper will use the retaining fixture to demonstrate the following HRA methodology's phases. The first phase is to perform a task analysis. The second phase is the identification of the potential human, both cognitive and psychomotor, functions performed by the worker. During the last phase the human errors are quantified. In reality, the HRA process is an iterative process in which the stages overlap and information gathered in one stage may be used to refine a previous stage. The rationale for the decision to use or not use the retaining fixture and the role the HRA played in the decision will be discussed. C1 Univ Calif Los Alamos Natl Lab, Human Factors Grp TSA9, Los Alamos, NM 87545 USA. RP Houghton, FK (reprint author), Univ Calif Los Alamos Natl Lab, Human Factors Grp TSA9, Los Alamos, NM 87545 USA. NR 2 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER-VERLAG LONDON LTD PI GODALMING PA SWEETAPPLE HOUSE CATTESHALL RD FARNCOMBE, GODALMING GU7 1NH, SURREY, ENGLAND BN 3-540-76262-0 PY 1998 BP 523 EP 528 PG 6 WC Engineering, Multidisciplinary; Multidisciplinary Sciences SC Engineering; Science & Technology - Other Topics GA BP34L UT WOS:000084758100080 ER PT B AU Whitehead, DW Kolaczkowski, AM Thompson, CM AF Whitehead, DW Kolaczkowski, AM Thompson, CM BE Mosleh, A Bari, RA TI Quantification results from an application of a new technique for human event analysis (ATHEANA) at a pressurized-water reactor SO PROBABILISTIC SAFETY ASSESSMENT AND MANAGEMENT (PSAM 4), VOLS 1-4 LA English DT Proceedings Paper CT 4th International Conference on Probabilistic Safety Assessment and Management CY SEP 13-18, 1998 CL NEW YORK, NY SP Int Assoc Probabilist Safety Assessment & Management, Amer Inst Chem Engineers, Amer Nucl Soc, Amer Soc Civil Engineers, Amer Soc Mech Engineers, Atom Energy Soc Japan, European Nucl Soc, European Safety & Reliabil Assoc, Fed Aviat Adm, Human Factors Soc, Inst Elect & Electr Engineers, Int Atom Energy Agcy, European Union, Joint Res Ctr, NASA, Org Econ Cooperat & Dev, Soc Risk Analy, Syst Safety Soc, UK Safety & Reliabil Soc, US Coast Guard, US DOE, US Nucl Regulatory Commiss, Associated Univ Inc, Beta Corp Int, BOOZ ALLEN & HAMILTON Inc, Brookhaven Sci Associates, ERIN Engn & Res Inc, PLG Inc, Sci Applicat Int Corp, SCIENTECH INC, Univ Maryland, Ctr Technol Risk Stud C1 Sandia Natl Labs, Livermore, CA 94550 USA. RP Whitehead, DW (reprint author), Sandia Natl Labs, Livermore, CA 94550 USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER-VERLAG LONDON LTD PI GODALMING PA SWEETAPPLE HOUSE CATTESHALL RD FARNCOMBE, GODALMING GU7 1NH, SURREY, ENGLAND BN 3-540-76262-0 PY 1998 BP 529 EP 535 PG 7 WC Engineering, Multidisciplinary; Multidisciplinary Sciences SC Engineering; Science & Technology - Other Topics GA BP34L UT WOS:000084758100081 ER PT B AU Auflick, JL Hahn, HA Morzinski, JA AF Auflick, JL Hahn, HA Morzinski, JA BE Mosleh, A Bari, RA TI HuRa! A prototype expert system for quantifying human errors SO PROBABILISTIC SAFETY ASSESSMENT AND MANAGEMENT (PSAM 4), VOLS 1-4 LA English DT Proceedings Paper CT 4th International Conference on Probabilistic Safety Assessment and Management CY SEP 13-18, 1998 CL NEW YORK, NY SP Int Assoc Probabilist Safety Assessment & Management, Amer Inst Chem Engineers, Amer Nucl Soc, Amer Soc Civil Engineers, Amer Soc Mech Engineers, Atom Energy Soc Japan, European Nucl Soc, European Safety & Reliabil Assoc, Fed Aviat Adm, Human Factors Soc, Inst Elect & Electr Engineers, Int Atom Energy Agcy, European Union, Joint Res Ctr, NASA, Org Econ Cooperat & Dev, Soc Risk Analy, Syst Safety Soc, UK Safety & Reliabil Soc, US Coast Guard, US DOE, US Nucl Regulatory Commiss, Associated Univ Inc, Beta Corp Int, BOOZ ALLEN & HAMILTON Inc, Brookhaven Sci Associates, ERIN Engn & Res Inc, PLG Inc, Sci Applicat Int Corp, SCIENTECH INC, Univ Maryland, Ctr Technol Risk Stud AB This report summarizes a three-year, Laboratory-Directed Research and Development (LDRD) project at the Los Alamos National Laboratory (LANL). Its main objective was the development of a Human Reliability Analysis (HRA) knowledge-based expert system. HRA identifies where human errors are most likely, estimates the error rate for individual tasks, and highlights the most beneficial areas for system improvements. Common HRA techniques and associated databases were collected and translated into an electronic format. Next, that expertise, i.e., the procedural rules and data were extracted from those techniques, modeled using artificial intelligence, and compiled into individual modules. Finally, these modules were combined into a HRA-based expert system that will provide probabilistic estimates for potential human errors within various risk and hazard assessments. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87544 USA. RP Auflick, JL (reprint author), Univ Calif Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87544 USA. NR 13 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER-VERLAG LONDON LTD PI GODALMING PA SWEETAPPLE HOUSE CATTESHALL RD FARNCOMBE, GODALMING GU7 1NH, SURREY, ENGLAND BN 3-540-76262-0 PY 1998 BP 536 EP 541 PG 6 WC Engineering, Multidisciplinary; Multidisciplinary Sciences SC Engineering; Science & Technology - Other Topics GA BP34L UT WOS:000084758100082 ER PT B AU Brown, NW Lu, S Chen, JC Roehnelt, R AF Brown, NW Lu, S Chen, JC Roehnelt, R BE Mosleh, A Bari, RA TI Health risk from earthquake caused releases of UF6 at the Paducah gaseous Diffusion Plant SO PROBABILISTIC SAFETY ASSESSMENT AND MANAGEMENT (PSAM 4), VOLS 1-4 LA English DT Proceedings Paper CT 4th International Conference on Probabilistic Safety Assessment and Management CY SEP 13-18, 1998 CL NEW YORK, NY SP Int Assoc Probabilist Safety Assessment & Management, Amer Inst Chem Engineers, Amer Nucl Soc, Amer Soc Civil Engineers, Amer Soc Mech Engineers, Atom Energy Soc Japan, European Nucl Soc, European Safety & Reliabil Assoc, Fed Aviat Adm, Human Factors Soc, Inst Elect & Electr Engineers, Int Atom Energy Agcy, European Union, Joint Res Ctr, NASA, Org Econ Cooperat & Dev, Soc Risk Analy, Syst Safety Soc, UK Safety & Reliabil Soc, US Coast Guard, US DOE, US Nucl Regulatory Commiss, Associated Univ Inc, Beta Corp Int, BOOZ ALLEN & HAMILTON Inc, Brookhaven Sci Associates, ERIN Engn & Res Inc, PLG Inc, Sci Applicat Int Corp, SCIENTECH INC, Univ Maryland, Ctr Technol Risk Stud AB The health risk to the public and workers from potential exposure to the toxic materials from earthquake caused releases of uranium hexafluoride from the Paducah gaseous Diffusion Plant are evaluated. The results of the study show that the health risk from earthquake caused releases is small, and probably less than risks associated with the transportation of hydrogen fluoride and other similar chemicals used by industry. The probability of more than 30 people experiencing health consequences (injuries) from earthquake damage is less than 4x10(-4)/yr. C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Brown, NW (reprint author), Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. NR 6 TC 0 Z9 0 U1 0 U2 1 PU SPRINGER-VERLAG LONDON LTD PI GODALMING PA SWEETAPPLE HOUSE CATTESHALL RD FARNCOMBE, GODALMING GU7 1NH, SURREY, ENGLAND BN 3-540-76262-0 PY 1998 BP 718 EP 723 PG 6 WC Engineering, Multidisciplinary; Multidisciplinary Sciences SC Engineering; Science & Technology - Other Topics GA BP34L UT WOS:000084758100109 ER PT B AU Houghton, FK AF Houghton, FK BE Mosleh, A Bari, RA TI The use of hazards analysis in the development of training SO PROBABILISTIC SAFETY ASSESSMENT AND MANAGEMENT (PSAM 4), VOLS 1-4 LA English DT Proceedings Paper CT 4th International Conference on Probabilistic Safety Assessment and Management CY SEP 13-18, 1998 CL NEW YORK, NY SP Int Assoc Probabilist Safety Assessment & Management, Amer Inst Chem Engineers, Amer Nucl Soc, Amer Soc Civil Engineers, Amer Soc Mech Engineers, Atom Energy Soc Japan, European Nucl Soc, European Safety & Reliabil Assoc, Fed Aviat Adm, Human Factors Soc, Inst Elect & Electr Engineers, Int Atom Energy Agcy, European Union, Joint Res Ctr, NASA, Org Econ Cooperat & Dev, Soc Risk Analy, Syst Safety Soc, UK Safety & Reliabil Soc, US Coast Guard, US DOE, US Nucl Regulatory Commiss, Associated Univ Inc, Beta Corp Int, BOOZ ALLEN & HAMILTON Inc, Brookhaven Sci Associates, ERIN Engn & Res Inc, PLG Inc, Sci Applicat Int Corp, SCIENTECH INC, Univ Maryland, Ctr Technol Risk Stud AB A hazards analysis identifies the operation hazards and the positive measures that aid in the mitigation or prevention of the hazard. If the tasks are human intensive, the hazard analysis often credits the personnel training as contributing to the mitigation of the accident's consequence or prevention of an accident sequence. To be able to credit worker training, it is important to understand the role of the training in the hazard analysis. Systematic training, known as systematic training design (STD), performance-based training (PBT), or instructional system design (ISD), uses five-phase (analysis, design, development, implementation, and evaluation) model for the development and implementation of the training. Both a hazards analysis and a training program begin with a task analysis that documents the roles and actions of the workers. Though the tasks analyses are different in nature, there is common ground and both the hazard analysis and the training program can benefit from a cooperative effort. However, the cooperation should not end with the task analysis phase of either program. The information gained from the hazards analysis should be used in all five phases of the training development. The training evaluation, both of the individual worker and institutional training program, can provide valuable information to the hazards analysis effort. This paper will discuss the integration of the information from the hazards analysis into a training program. The paper will use the installation and removal of a piece of tooling that is used in a high-explosive operation. This example will be used to follow the systematic development of a training program and demonstrate the interaction and cooperation between the hazards analysis and training program. C1 Univ Calif Los Alamos Natl Lab, Human Factors Grp TSA9, Los Alamos, NM 87545 USA. RP Houghton, FK (reprint author), Univ Calif Los Alamos Natl Lab, Human Factors Grp TSA9, Los Alamos, NM 87545 USA. NR 2 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER-VERLAG LONDON LTD PI GODALMING PA SWEETAPPLE HOUSE CATTESHALL RD FARNCOMBE, GODALMING GU7 1NH, SURREY, ENGLAND BN 3-540-76262-0 PY 1998 BP 746 EP 751 PG 6 WC Engineering, Multidisciplinary; Multidisciplinary Sciences SC Engineering; Science & Technology - Other Topics GA BP34L UT WOS:000084758100113 ER PT B AU Picard, RR Martz, HF AF Picard, RR Martz, HF BE Mosleh, A Bari, RA TI Comparing PRAs with operating experience SO PROBABILISTIC SAFETY ASSESSMENT AND MANAGEMENT (PSAM 4), VOLS 1-4 LA English DT Proceedings Paper CT 4th International Conference on Probabilistic Safety Assessment and Management CY SEP 13-18, 1998 CL NEW YORK, NY SP Int Assoc Probabilist Safety Assessment & Management, Amer Inst Chem Engineers, Amer Nucl Soc, Amer Soc Civil Engineers, Amer Soc Mech Engineers, Atom Energy Soc Japan, European Nucl Soc, European Safety & Reliabil Assoc, Fed Aviat Adm, Human Factors Soc, Inst Elect & Electr Engineers, Int Atom Energy Agcy, European Union, Joint Res Ctr, NASA, Org Econ Cooperat & Dev, Soc Risk Analy, Syst Safety Soc, UK Safety & Reliabil Soc, US Coast Guard, US DOE, US Nucl Regulatory Commiss, Associated Univ Inc, Beta Corp Int, BOOZ ALLEN & HAMILTON Inc, Brookhaven Sci Associates, ERIN Engn & Res Inc, PLG Inc, Sci Applicat Int Corp, SCIENTECH INC, Univ Maryland, Ctr Technol Risk Stud AB Probabilistic Risk Assessment is widely used to estimate the frequencies of rare events, such as nuclear power plant accidents. An obvious question concerns the extent to which PRAs conform to operating experience -- that is, do PRAs agree with reality? We discuss a formal methodology to address this issue and examine its performance using plant-specific data. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87544 USA. RP Picard, RR (reprint author), Univ Calif Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87544 USA. NR 11 TC 0 Z9 0 U1 0 U2 1 PU SPRINGER-VERLAG LONDON LTD PI GODALMING PA SWEETAPPLE HOUSE CATTESHALL RD FARNCOMBE, GODALMING GU7 1NH, SURREY, ENGLAND BN 3-540-76262-0 PY 1998 BP 852 EP 857 PG 6 WC Engineering, Multidisciplinary; Multidisciplinary Sciences SC Engineering; Science & Technology - Other Topics GA BP34L UT WOS:000084758100129 ER PT B AU Anderson, DR Helton, JC Jow, HN Marietta, MG Chu, MSY Shephard, LE Basabilvazo, G AF Anderson, DR Helton, JC Jow, HN Marietta, MG Chu, MSY Shephard, LE Basabilvazo, G BE Mosleh, A Bari, RA TI The 1996 performance assessment for the waste isolation pilot plant SO PROBABILISTIC SAFETY ASSESSMENT AND MANAGEMENT (PSAM 4), VOLS 1-4 LA English DT Proceedings Paper CT 4th International Conference on Probabilistic Safety Assessment and Management CY SEP 13-18, 1998 CL NEW YORK, NY SP Int Assoc Probabilist Safety Assessment & Management, Amer Inst Chem Engineers, Amer Nucl Soc, Amer Soc Civil Engineers, Amer Soc Mech Engineers, Atom Energy Soc Japan, European Nucl Soc, European Safety & Reliabil Assoc, Fed Aviat Adm, Human Factors Soc, Inst Elect & Electr Engineers, Int Atom Energy Agcy, European Union, Joint Res Ctr, NASA, Org Econ Cooperat & Dev, Soc Risk Analy, Syst Safety Soc, UK Safety & Reliabil Soc, US Coast Guard, US DOE, US Nucl Regulatory Commiss, Associated Univ Inc, Beta Corp Int, BOOZ ALLEN & HAMILTON Inc, Brookhaven Sci Associates, ERIN Engn & Res Inc, PLG Inc, Sci Applicat Int Corp, SCIENTECH INC, Univ Maryland, Ctr Technol Risk Stud ID UNCERTAINTY C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Anderson, DR (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. NR 12 TC 0 Z9 0 U1 1 U2 1 PU SPRINGER-VERLAG LONDON LTD PI GODALMING PA SWEETAPPLE HOUSE CATTESHALL RD FARNCOMBE, GODALMING GU7 1NH, SURREY, ENGLAND BN 3-540-76262-0 PY 1998 BP 899 EP 905 PG 7 WC Engineering, Multidisciplinary; Multidisciplinary Sciences SC Engineering; Science & Technology - Other Topics GA BP34L UT WOS:000084758100136 ER PT B AU Gertman, D Ostrom, LT Hartley, RS AF Gertman, D Ostrom, LT Hartley, RS BE Mosleh, A Bari, RA TI Human reliability analysis techniques application to occupational risk: Perspective for risk management program SO PROBABILISTIC SAFETY ASSESSMENT AND MANAGEMENT (PSAM 4), VOLS 1-4 LA English DT Proceedings Paper CT 4th International Conference on Probabilistic Safety Assessment and Management CY SEP 13-18, 1998 CL NEW YORK, NY SP Int Assoc Probabilist Safety Assessment & Management, Amer Inst Chem Engineers, Amer Nucl Soc, Amer Soc Civil Engineers, Amer Soc Mech Engineers, Atom Energy Soc Japan, European Nucl Soc, European Safety & Reliabil Assoc, Fed Aviat Adm, Human Factors Soc, Inst Elect & Electr Engineers, Int Atom Energy Agcy, European Union, Joint Res Ctr, NASA, Org Econ Cooperat & Dev, Soc Risk Analy, Syst Safety Soc, UK Safety & Reliabil Soc, US Coast Guard, US DOE, US Nucl Regulatory Commiss, Associated Univ Inc, Beta Corp Int, BOOZ ALLEN & HAMILTON Inc, Brookhaven Sci Associates, ERIN Engn & Res Inc, PLG Inc, Sci Applicat Int Corp, SCIENTECH INC, Univ Maryland, Ctr Technol Risk Stud AB Although probabilistic risk assessment (PRA) methods have been used to identify, model, and quantify risk to the public posed by potential hazards, very little effort to date has been spent applying PRA advances to occupational health (OH) concerns. We suggest a model that emphasizes one set of PRA technologies human reliability assessment (HRA) methods - and show how HRA, within the context of PRA, can be used to characterize and potentially quantify the risk associated with OH. The Department of Energy (DOE) Occurrence Reporting and Processing System (ORPS) events data base is suggested as a raw data source for identifying and developing HRA/PRA event sequences. The DOE severity index is used to define end-states for which frequencies and probabilities can then determined. C1 Lockheed Martin Idaho Technol Co, INEEL, Idaho Falls, ID 83415 USA. RP Gertman, D (reprint author), Lockheed Martin Idaho Technol Co, INEEL, POB 1645, Idaho Falls, ID 83415 USA. NR 7 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER-VERLAG LONDON LTD PI GODALMING PA SWEETAPPLE HOUSE CATTESHALL RD FARNCOMBE, GODALMING GU7 1NH, SURREY, ENGLAND BN 3-540-76262-0 PY 1998 BP 915 EP 920 PG 6 WC Engineering, Multidisciplinary; Multidisciplinary Sciences SC Engineering; Science & Technology - Other Topics GA BP34L UT WOS:000084758100138 ER PT B AU McCulloch, WH AF McCulloch, WH BE Mosleh, A Bari, RA TI A nuclear source term analysis for spacecraft power systems SO PROBABILISTIC SAFETY ASSESSMENT AND MANAGEMENT (PSAM 4), VOLS 1-4 LA English DT Proceedings Paper CT 4th International Conference on Probabilistic Safety Assessment and Management CY SEP 13-18, 1998 CL NEW YORK, NY SP Int Assoc Probabilist Safety Assessment & Management, Amer Inst Chem Engineers, Amer Nucl Soc, Amer Soc Civil Engineers, Amer Soc Mech Engineers, Atom Energy Soc Japan, European Nucl Soc, European Safety & Reliabil Assoc, Fed Aviat Adm, Human Factors Soc, Inst Elect & Electr Engineers, Int Atom Energy Agcy, European Union, Joint Res Ctr, NASA, Org Econ Cooperat & Dev, Soc Risk Analy, Syst Safety Soc, UK Safety & Reliabil Soc, US Coast Guard, US DOE, US Nucl Regulatory Commiss, Associated Univ Inc, Beta Corp Int, BOOZ ALLEN & HAMILTON Inc, Brookhaven Sci Associates, ERIN Engn & Res Inc, PLG Inc, Sci Applicat Int Corp, SCIENTECH INC, Univ Maryland, Ctr Technol Risk Stud AB All US space missions involving on board nuclear material must be approved by the Office of the President. To be approved the mission and the hardware systems must undergo evaluations of the associated nuclear health and safety risk. One part of those evaluations is the characterization of the source terms, i.e., the estimate of the amount, physical form, and location of nuclear material, which might be released into the environment in the event of credible accidents. This paper presents a brief overview of the source term analysis by the Interagency Nuclear Safety Review Panel for the NASA Cassini Space Mission launched in October 1997. Included is a description of the Energy Interaction Model, an innovative approach to the analysis of potential releases from high velocity impacts resulting from launch aborts and reentries. C1 Sandia Natl Labs, Safety & Risk Assesssment Dept, Albuquerque, NM 87185 USA. RP McCulloch, WH (reprint author), Sandia Natl Labs, Safety & Risk Assesssment Dept, POB 5800, Albuquerque, NM 87185 USA. NR 7 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER-VERLAG LONDON LTD PI GODALMING PA SWEETAPPLE HOUSE CATTESHALL RD FARNCOMBE, GODALMING GU7 1NH, SURREY, ENGLAND BN 3-540-76262-0 PY 1998 BP 945 EP 949 PG 5 WC Engineering, Multidisciplinary; Multidisciplinary Sciences SC Engineering; Science & Technology - Other Topics GA BP34L UT WOS:000084758100143 ER PT B AU Muhlheim, MD Belles, RJ AF Muhlheim, MD Belles, RJ BE Mosleh, A Bari, RA TI A qualitative review of the accident sequence precursor program SO PROBABILISTIC SAFETY ASSESSMENT AND MANAGEMENT (PSAM 4), VOLS 1-4 LA English DT Proceedings Paper CT 4th International Conference on Probabilistic Safety Assessment and Management CY SEP 13-18, 1998 CL NEW YORK, NY SP Int Assoc Probabilist Safety Assessment & Management, Amer Inst Chem Engineers, Amer Nucl Soc, Amer Soc Civil Engineers, Amer Soc Mech Engineers, Atom Energy Soc Japan, European Nucl Soc, European Safety & Reliabil Assoc, Fed Aviat Adm, Human Factors Soc, Inst Elect & Electr Engineers, Int Atom Energy Agcy, European Union, Joint Res Ctr, NASA, Org Econ Cooperat & Dev, Soc Risk Analy, Syst Safety Soc, UK Safety & Reliabil Soc, US Coast Guard, US DOE, US Nucl Regulatory Commiss, Associated Univ Inc, Beta Corp Int, BOOZ ALLEN & HAMILTON Inc, Brookhaven Sci Associates, ERIN Engn & Res Inc, PLG Inc, Sci Applicat Int Corp, SCIENTECH INC, Univ Maryland, Ctr Technol Risk Stud AB The Accident Sequence Precursor (ASP) Program involves the review of licensee event reports on operational events that have occurred at U.S. light-water power reactors to identify and categorize precursors to potential severe core damage accidents. Originally proposed in the Risk Assessment Review Group Report (Lewis Committee report) in 1978, the study - subsequently named the Accident Sequence Precursor Program - was initiated in 1979 at the Oak Ridge National Laboratory. The first major report of that program, Precursors to Potential Severe Core Damage Accidents: 1969-1979, A Status Report (NUREG/CR-2497), was formally published in June 1982. Currently, almost 30 years of operational events have been reviewed by the ASP Program (1969-1996). Although many changes have occurred in reporting requirements, event selection criteria, ASP models, plant safety equipment, etc., several qualitative conclusions that transcend these changes are apparent from the review of the last ten years of data. For example, electric-power related events and conditions continue to be a significant fraction of the precursor events. Similarly, the number of losses of offsite power events per year, as well as the number of events involving the degradation of auxiliary feedwater, remains relatively constant. More significantly, the number of events deemed to be important appears to be relatively constant; however, those with the highest probability of occurring actually occur rather infrequently and are unique events (i.e., no pattern as to where, what, why, or how they occur). C1 Oak Ridge Natl Lab, Oak Ridge, TN USA. RP Muhlheim, MD (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN USA. NR 9 TC 1 Z9 1 U1 0 U2 0 PU SPRINGER-VERLAG LONDON LTD PI GODALMING PA SWEETAPPLE HOUSE CATTESHALL RD FARNCOMBE, GODALMING GU7 1NH, SURREY, ENGLAND BN 3-540-76262-0 PY 1998 BP 965 EP 970 PG 6 WC Engineering, Multidisciplinary; Multidisciplinary Sciences SC Engineering; Science & Technology - Other Topics GA BP34L UT WOS:000084758100146 ER PT B AU Moore, LM Hemphill, GM Martz, HF AF Moore, LM Hemphill, GM Martz, HF BE Mosleh, A Bari, RA TI Failure rate analysis using GLIMMIX SO PROBABILISTIC SAFETY ASSESSMENT AND MANAGEMENT (PSAM 4), VOLS 1-4 LA English DT Proceedings Paper CT 4th International Conference on Probabilistic Safety Assessment and Management CY SEP 13-18, 1998 CL NEW YORK, NY SP Int Assoc Probabilist Safety Assessment & Management, Amer Inst Chem Engineers, Amer Nucl Soc, Amer Soc Civil Engineers, Amer Soc Mech Engineers, Atom Energy Soc Japan, European Nucl Soc, European Safety & Reliabil Assoc, Fed Aviat Adm, Human Factors Soc, Inst Elect & Electr Engineers, Int Atom Energy Agcy, European Union, Joint Res Ctr, NASA, Org Econ Cooperat & Dev, Soc Risk Analy, Syst Safety Soc, UK Safety & Reliabil Soc, US Coast Guard, US DOE, US Nucl Regulatory Commiss, Associated Univ Inc, Beta Corp Int, BOOZ ALLEN & HAMILTON Inc, Brookhaven Sci Associates, ERIN Engn & Res Inc, PLG Inc, Sci Applicat Int Corp, SCIENTECH INC, Univ Maryland, Ctr Technol Risk Stud ID MODELS C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87544 USA. RP Moore, LM (reprint author), Univ Calif Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87544 USA. NR 9 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER-VERLAG LONDON LTD PI GODALMING PA SWEETAPPLE HOUSE CATTESHALL RD FARNCOMBE, GODALMING GU7 1NH, SURREY, ENGLAND BN 3-540-76262-0 PY 1998 BP 1045 EP 1050 PG 6 WC Engineering, Multidisciplinary; Multidisciplinary Sciences SC Engineering; Science & Technology - Other Topics GA BP34L UT WOS:000084758100158 ER PT B AU Cooper, JA Diegert, KV AF Cooper, JA Diegert, KV BE Mosleh, A Bari, RA TI Improving analytical understanding through the addition of information: Bayesian and hybrid mathematics approaches SO PROBABILISTIC SAFETY ASSESSMENT AND MANAGEMENT (PSAM 4), VOLS 1-4 LA English DT Proceedings Paper CT 4th International Conference on Probabilistic Safety Assessment and Management CY SEP 13-18, 1998 CL NEW YORK, NY SP Int Assoc Probabilist Safety Assessment & Management, Amer Inst Chem Engineers, Amer Nucl Soc, Amer Soc Civil Engineers, Amer Soc Mech Engineers, Atom Energy Soc Japan, European Nucl Soc, European Safety & Reliabil Assoc, Fed Aviat Adm, Human Factors Soc, Inst Elect & Electr Engineers, Int Atom Energy Agcy, European Union, Joint Res Ctr, NASA, Org Econ Cooperat & Dev, Soc Risk Analy, Syst Safety Soc, UK Safety & Reliabil Soc, US Coast Guard, US DOE, US Nucl Regulatory Commiss, Associated Univ Inc, Beta Corp Int, BOOZ ALLEN & HAMILTON Inc, Brookhaven Sci Associates, ERIN Engn & Res Inc, PLG Inc, Sci Applicat Int Corp, SCIENTECH INC, Univ Maryland, Ctr Technol Risk Stud AB Safety analysts frequently must provide results that are based on sparse (or even no) data. When data (or more data) become available, it is important to utilize the new information optimally in improving the analysis results. Two methods for accomplishing this purpose are Bayesian analysis, where "prior" probability distributions are modified to become "posterior" distributions based on the new data, and hybrid (possibilistic/probabilistic analysis) where possibilistic "membership" portrays the subjectivity involved and the probabilistic analysis is "frequentist." Each of these approaches has interesting features, and it is advantageous to compare and contrast the two. In addition to describing and contrasting these two approaches, we will discuss how features of each can be combined to give new advantages neither offers by itself. C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Cooper, JA (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER-VERLAG LONDON LTD PI GODALMING PA SWEETAPPLE HOUSE CATTESHALL RD FARNCOMBE, GODALMING GU7 1NH, SURREY, ENGLAND BN 3-540-76262-0 PY 1998 BP 1051 EP 1056 PG 6 WC Engineering, Multidisciplinary; Multidisciplinary Sciences SC Engineering; Science & Technology - Other Topics GA BP34L UT WOS:000084758100159 ER PT B AU Luck, LB AF Luck, LB BE Mosleh, A Bari, RA TI Estimation of upper bound probabilities for rare events resulting from nearby explosions SO PROBABILISTIC SAFETY ASSESSMENT AND MANAGEMENT (PSAM 4), VOLS 1-4 LA English DT Proceedings Paper CT 4th International Conference on Probabilistic Safety Assessment and Management CY SEP 13-18, 1998 CL NEW YORK, NY SP Int Assoc Probabilist Safety Assessment & Management, Amer Inst Chem Engineers, Amer Nucl Soc, Amer Soc Civil Engineers, Amer Soc Mech Engineers, Atom Energy Soc Japan, European Nucl Soc, European Safety & Reliabil Assoc, Fed Aviat Adm, Human Factors Soc, Inst Elect & Electr Engineers, Int Atom Energy Agcy, European Union, Joint Res Ctr, NASA, Org Econ Cooperat & Dev, Soc Risk Analy, Syst Safety Soc, UK Safety & Reliabil Soc, US Coast Guard, US DOE, US Nucl Regulatory Commiss, Associated Univ Inc, Beta Corp Int, BOOZ ALLEN & HAMILTON Inc, Brookhaven Sci Associates, ERIN Engn & Res Inc, PLG Inc, Sci Applicat Int Corp, SCIENTECH INC, Univ Maryland, Ctr Technol Risk Stud C1 Univ Calif Los Alamos Natl Lab, Technol & Safety Assessment Div, Los Alamos, NM 87545 USA. RP Luck, LB (reprint author), Univ Calif Los Alamos Natl Lab, Technol & Safety Assessment Div, Los Alamos, NM 87545 USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER-VERLAG LONDON LTD PI GODALMING PA SWEETAPPLE HOUSE CATTESHALL RD FARNCOMBE, GODALMING GU7 1NH, SURREY, ENGLAND BN 3-540-76262-0 PY 1998 BP 1083 EP 1088 PG 6 WC Engineering, Multidisciplinary; Multidisciplinary Sciences SC Engineering; Science & Technology - Other Topics GA BP34L UT WOS:000084758100164 ER PT B AU Sattison, MB Schroeder, JA Knudsen, JR Beck, ST Russell, KD AF Sattison, MB Schroeder, JA Knudsen, JR Beck, ST Russell, KD BE Mosleh, A Bari, RA TI Automated power recovery analysis for nuclear power plant accident sequence precursor evaluations SO PROBABILISTIC SAFETY ASSESSMENT AND MANAGEMENT (PSAM 4), VOLS 1-4 LA English DT Proceedings Paper CT 4th International Conference on Probabilistic Safety Assessment and Management CY SEP 13-18, 1998 CL NEW YORK, NY SP Int Assoc Probabilist Safety Assessment & Management, Amer Inst Chem Engineers, Amer Nucl Soc, Amer Soc Civil Engineers, Amer Soc Mech Engineers, Atom Energy Soc Japan, European Nucl Soc, European Safety & Reliabil Assoc, Fed Aviat Adm, Human Factors Soc, Inst Elect & Electr Engineers, Int Atom Energy Agcy, European Union, Joint Res Ctr, NASA, Org Econ Cooperat & Dev, Soc Risk Analy, Syst Safety Soc, UK Safety & Reliabil Soc, US Coast Guard, US DOE, US Nucl Regulatory Commiss, Associated Univ Inc, Beta Corp Int, BOOZ ALLEN & HAMILTON Inc, Brookhaven Sci Associates, ERIN Engn & Res Inc, PLG Inc, Sci Applicat Int Corp, SCIENTECH INC, Univ Maryland, Ctr Technol Risk Stud AB This paper presents the latest developments in methods of modeling recovery of emergency and offsite electrical power in the U.S. Nuclear Regulatory Commission's (NRC's) Accident Sequence Precursor (ASP) Program [1]. C1 Lockheed Martin Idaho Technol Co, Idaho Natl Engn & Environm Lab, Idaho Falls, ID USA. RP Sattison, MB (reprint author), Lockheed Martin Idaho Technol Co, Idaho Natl Engn & Environm Lab, Idaho Falls, ID USA. NR 6 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER-VERLAG LONDON LTD PI GODALMING PA SWEETAPPLE HOUSE CATTESHALL RD FARNCOMBE, GODALMING GU7 1NH, SURREY, ENGLAND BN 3-540-76262-0 PY 1998 BP 1177 EP 1182 PG 6 WC Engineering, Multidisciplinary; Multidisciplinary Sciences SC Engineering; Science & Technology - Other Topics GA BP34L UT WOS:000084758100178 ER PT B AU Kelly, DL AF Kelly, DL BE Mosleh, A Bari, RA TI Bayesian hypothesis testing and the Maintenance Rule SO PROBABILISTIC SAFETY ASSESSMENT AND MANAGEMENT (PSAM 4), VOLS 1-4 LA English DT Proceedings Paper CT 4th International Conference on Probabilistic Safety Assessment and Management CY SEP 13-18, 1998 CL NEW YORK, NY SP Int Assoc Probabilist Safety Assessment & Management, Amer Inst Chem Engineers, Amer Nucl Soc, Amer Soc Civil Engineers, Amer Soc Mech Engineers, Atom Energy Soc Japan, European Nucl Soc, European Safety & Reliabil Assoc, Fed Aviat Adm, Human Factors Soc, Inst Elect & Electr Engineers, Int Atom Energy Agcy, European Union, Joint Res Ctr, NASA, Org Econ Cooperat & Dev, Soc Risk Analy, Syst Safety Soc, UK Safety & Reliabil Soc, US Coast Guard, US DOE, US Nucl Regulatory Commiss, Associated Univ Inc, Beta Corp Int, BOOZ ALLEN & HAMILTON Inc, Brookhaven Sci Associates, ERIN Engn & Res Inc, PLG Inc, Sci Applicat Int Corp, SCIENTECH INC, Univ Maryland, Ctr Technol Risk Stud AB The Maintenance Rule (10 CFR 50.65) went into effect in the United States in July 1996. It requires commercial nuclear utilities to monitor system performance (system reliability and maintenance unavailability) for systems that are determined by the utility to be important to plant safety. Utilities must set performance goals for such systems and monitor system performance against these goals. In addition, these performance goals are intended to be commensurate with the safety significance of the system, which can be established by a probabilistic safety assessment of the plant. This paper examines the frequentist approach to monitoring performance, which is being used by several utilities, and proposes an alternative Bayesian approach. The Bayesian approach makes more complete use of the information in the probabilistic safety assessment, is consistent philosophically with the subjective interpretation given to probability in most probabilistic safety assessments, overcomes several pitfalls in the frequentist approach, provides results which are easily interpretable, and is straightforward to implement using the information in the probabilistic Safety assessment. C1 Lockheed Martin Idaho Technol Co, Rockville, MD 20852 USA. RP Kelly, DL (reprint author), Lockheed Martin Idaho Technol Co, 11426 Rockville Pike,Suite 410, Rockville, MD 20852 USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER-VERLAG LONDON LTD PI GODALMING PA SWEETAPPLE HOUSE CATTESHALL RD FARNCOMBE, GODALMING GU7 1NH, SURREY, ENGLAND BN 3-540-76262-0 PY 1998 BP 1245 EP 1250 PG 6 WC Engineering, Multidisciplinary; Multidisciplinary Sciences SC Engineering; Science & Technology - Other Topics GA BP34L UT WOS:000084758100189 ER PT B AU Martinez-Guridi, G Samanta, P Chu, L Yang, J AF Martinez-Guridi, G Samanta, P Chu, L Yang, J BE Mosleh, A Bari, RA TI LOCA with consequential or delayed LOOP accidents: Unique issues, plant vulnerability, and CDP contributions SO PROBABILISTIC SAFETY ASSESSMENT AND MANAGEMENT (PSAM 4), VOLS 1-4 LA English DT Proceedings Paper CT 4th International Conference on Probabilistic Safety Assessment and Management CY SEP 13-18, 1998 CL NEW YORK, NY SP Int Assoc Probabilist Safety Assessment & Management, Amer Inst Chem Engineers, Amer Nucl Soc, Amer Soc Civil Engineers, Amer Soc Mech Engineers, Atom Energy Soc Japan, European Nucl Soc, European Safety & Reliabil Assoc, Fed Aviat Adm, Human Factors Soc, Inst Elect & Electr Engineers, Int Atom Energy Agcy, European Union, Joint Res Ctr, NASA, Org Econ Cooperat & Dev, Soc Risk Analy, Syst Safety Soc, UK Safety & Reliabil Soc, US Coast Guard, US DOE, US Nucl Regulatory Commiss, Associated Univ Inc, Beta Corp Int, BOOZ ALLEN & HAMILTON Inc, Brookhaven Sci Associates, ERIN Engn & Res Inc, PLG Inc, Sci Applicat Int Corp, SCIENTECH INC, Univ Maryland, Ctr Technol Risk Stud AB A loss-of-coolant accident (LOCA) can cause a loss-of-offsite power (LOOP) wherein the LOOP is usually delayed by few seconds or longer. Such an accident is called LOCA with consequential LOOP, or LOCA with delayed LOOP (here, abbreviated as LOCA/LOOP). This paper analyzes the unique conditions that are associated with a LOCA/LOOP, presents a model, and quantifies its contribution to core damage frequency (CDF). The results show that the CDF contribution can be a dominant contributor to risk for certain plant designs, although boiling water reactors (BWRs) are less vulnerable than pressurized water reactors (PWRs). C1 Brookhaven Natl Lab, Dept Adv Technol, Upton, NY 11973 USA. RP Martinez-Guridi, G (reprint author), Brookhaven Natl Lab, Dept Adv Technol, Upton, NY 11973 USA. NR 4 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER-VERLAG LONDON LTD PI GODALMING PA SWEETAPPLE HOUSE CATTESHALL RD FARNCOMBE, GODALMING GU7 1NH, SURREY, ENGLAND BN 3-540-76262-0 PY 1998 BP 1279 EP 1284 PG 6 WC Engineering, Multidisciplinary; Multidisciplinary Sciences SC Engineering; Science & Technology - Other Topics GA BP34L UT WOS:000084758100194 ER PT B AU Spray, SD Cooper, JA AF Spray, SD Cooper, JA BE Mosleh, A Bari, RA TI Structured design and assessment of safety systems based on principles SO PROBABILISTIC SAFETY ASSESSMENT AND MANAGEMENT (PSAM 4), VOLS 1-4 LA English DT Proceedings Paper CT 4th International Conference on Probabilistic Safety Assessment and Management CY SEP 13-18, 1998 CL NEW YORK, NY SP Int Assoc Probabilist Safety Assessment & Management, Amer Inst Chem Engineers, Amer Nucl Soc, Amer Soc Civil Engineers, Amer Soc Mech Engineers, Atom Energy Soc Japan, European Nucl Soc, European Safety & Reliabil Assoc, Fed Aviat Adm, Human Factors Soc, Inst Elect & Electr Engineers, Int Atom Energy Agcy, European Union, Joint Res Ctr, NASA, Org Econ Cooperat & Dev, Soc Risk Analy, Syst Safety Soc, UK Safety & Reliabil Soc, US Coast Guard, US DOE, US Nucl Regulatory Commiss, Associated Univ Inc, Beta Corp Int, BOOZ ALLEN & HAMILTON Inc, Brookhaven Sci Associates, ERIN Engn & Res Inc, PLG Inc, Sci Applicat Int Corp, SCIENTECH INC, Univ Maryland, Ctr Technol Risk Stud AB Safety system designers can contribute not only to safe designs, but also to reliable analysis of these designs by adhering to a principle-based structured approach. Once this approach is in place, safety assessment is also based on the same structure. The U.S. nuclear weapons design and assessment follows this structured approach, and we believe that this is one of the reasons that there has never been an accidental nuclear detonation. In this paper, we describe both the structured design approach and the structured assessment approach that were developed in the U.S. nuclear weapons program, both of which we believe can have wide applicability to a variety of other safety systems. C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Spray, SD (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER-VERLAG LONDON LTD PI GODALMING PA SWEETAPPLE HOUSE CATTESHALL RD FARNCOMBE, GODALMING GU7 1NH, SURREY, ENGLAND BN 3-540-76262-0 PY 1998 BP 1597 EP 1602 PG 6 WC Engineering, Multidisciplinary; Multidisciplinary Sciences SC Engineering; Science & Technology - Other Topics GA BP34L UT WOS:000084758100241 ER PT B AU Brereton, S Altenbach, T AF Brereton, S Altenbach, T BE Mosleh, A Bari, RA TI Risk ranking methodology for chemical release events - UCRL-JC-128510 SO PROBABILISTIC SAFETY ASSESSMENT AND MANAGEMENT (PSAM 4), VOLS 1-4 LA English DT Proceedings Paper CT 4th International Conference on Probabilistic Safety Assessment and Management CY SEP 13-18, 1998 CL NEW YORK, NY SP Int Assoc Probabilist Safety Assessment & Management, Amer Inst Chem Engineers, Amer Nucl Soc, Amer Soc Civil Engineers, Amer Soc Mech Engineers, Atom Energy Soc Japan, European Nucl Soc, European Safety & Reliabil Assoc, Fed Aviat Adm, Human Factors Soc, Inst Elect & Electr Engineers, Int Atom Energy Agcy, European Union, Joint Res Ctr, NASA, Org Econ Cooperat & Dev, Soc Risk Analy, Syst Safety Soc, UK Safety & Reliabil Soc, US Coast Guard, US DOE, US Nucl Regulatory Commiss, Associated Univ Inc, Beta Corp Int, BOOZ ALLEN & HAMILTON Inc, Brookhaven Sci Associates, ERIN Engn & Res Inc, PLG Inc, Sci Applicat Int Corp, SCIENTECH INC, Univ Maryland, Ctr Technol Risk Stud C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Brereton, S (reprint author), Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER-VERLAG LONDON LTD PI GODALMING PA SWEETAPPLE HOUSE CATTESHALL RD FARNCOMBE, GODALMING GU7 1NH, SURREY, ENGLAND BN 3-540-76262-0 PY 1998 BP 1743 EP 1748 PG 6 WC Engineering, Multidisciplinary; Multidisciplinary Sciences SC Engineering; Science & Technology - Other Topics GA BP34L UT WOS:000084758100264 ER PT B AU Mubayi, V Lehner, J Lin, CC Conrad, C Pratt, WT Bari, RA AF Mubayi, V Lehner, J Lin, CC Conrad, C Pratt, WT Bari, RA BE Mosleh, A Bari, RA TI Prioritization of environmental, safety, and health issues at Brookhaven National Laboratory SO PROBABILISTIC SAFETY ASSESSMENT AND MANAGEMENT (PSAM 4), VOLS 1-4 LA English DT Proceedings Paper CT 4th International Conference on Probabilistic Safety Assessment and Management CY SEP 13-18, 1998 CL NEW YORK, NY SP Int Assoc Probabilist Safety Assessment & Management, Amer Inst Chem Engineers, Amer Nucl Soc, Amer Soc Civil Engineers, Amer Soc Mech Engineers, Atom Energy Soc Japan, European Nucl Soc, European Safety & Reliabil Assoc, Fed Aviat Adm, Human Factors Soc, Inst Elect & Electr Engineers, Int Atom Energy Agcy, European Union, Joint Res Ctr, NASA, Org Econ Cooperat & Dev, Soc Risk Analy, Syst Safety Soc, UK Safety & Reliabil Soc, US Coast Guard, US DOE, US Nucl Regulatory Commiss, Associated Univ Inc, Beta Corp Int, BOOZ ALLEN & HAMILTON Inc, Brookhaven Sci Associates, ERIN Engn & Res Inc, PLG Inc, Sci Applicat Int Corp, SCIENTECH INC, Univ Maryland, Ctr Technol Risk Stud AB This paper describes short-term and long-term enhancements to the existing prioritization system at BNL which are being carried out under the Management Systems Improvement Program in response to DOE's Integrated Safety Management System Evaluation of BNL. The enhancements focus on: inclusion of stakeholder (public, elected of officials, and media) perceptions; achievement and maintenance of full compliance with all applicable federal, state, and local laws, ordinances regulations, and codes; devotion of special attention to unique risk factors; and integration of ES&H and Infrastructure issues within one prioritization model. Based on the above considerations, short-term enhancements to the prioritization system include an additional impact category related to stakeholder perception and revised scores under one existing category. To improve scrutability and traceability, the enhancements incorporate a computerized scoring program and simple logic models for assessing impacts. Improving scrutability is vital for establishing confidence in a decision-making process which, by necessity, must cover a wide array of projects ranging from the safe containment and isolation of hazardous materials to upgrades of aging buildings. An interim procedure has also been developed to integrate ES&H projects and Infrastructure projects prioritized using separate models into one single, prioritized list. In the longterm, a single model needs to be developed to prioritize both ES&H and Infrastructure improvement projects within one framework to replace the two different approaches being used currently. C1 Brookhaven Natl Lab, Dept Adv Technol, Upton, NY 11973 USA. RP Mubayi, V (reprint author), Brookhaven Natl Lab, Dept Adv Technol, Upton, NY 11973 USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER-VERLAG LONDON LTD PI GODALMING PA SWEETAPPLE HOUSE CATTESHALL RD FARNCOMBE, GODALMING GU7 1NH, SURREY, ENGLAND BN 3-540-76262-0 PY 1998 BP 1797 EP 1802 PG 6 WC Engineering, Multidisciplinary; Multidisciplinary Sciences SC Engineering; Science & Technology - Other Topics GA BP34L UT WOS:000084758100272 ER PT B AU Glaser, RE AF Glaser, RE BE Mosleh, A Bari, RA TI Calculation of the estimated probability of an aircraft crash into a structure SO PROBABILISTIC SAFETY ASSESSMENT AND MANAGEMENT (PSAM 4), VOLS 1-4 LA English DT Proceedings Paper CT 4th International Conference on Probabilistic Safety Assessment and Management CY SEP 13-18, 1998 CL NEW YORK, NY SP Int Assoc Probabilist Safety Assessment & Management, Amer Inst Chem Engineers, Amer Nucl Soc, Amer Soc Civil Engineers, Amer Soc Mech Engineers, Atom Energy Soc Japan, European Nucl Soc, European Safety & Reliabil Assoc, Fed Aviat Adm, Human Factors Soc, Inst Elect & Electr Engineers, Int Atom Energy Agcy, European Union, Joint Res Ctr, NASA, Org Econ Cooperat & Dev, Soc Risk Analy, Syst Safety Soc, UK Safety & Reliabil Soc, US Coast Guard, US DOE, US Nucl Regulatory Commiss, Associated Univ Inc, Beta Corp Int, BOOZ ALLEN & HAMILTON Inc, Brookhaven Sci Associates, ERIN Engn & Res Inc, PLG Inc, Sci Applicat Int Corp, SCIENTECH INC, Univ Maryland, Ctr Technol Risk Stud C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Glaser, RE (reprint author), Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. NR 2 TC 0 Z9 0 U1 1 U2 1 PU SPRINGER-VERLAG LONDON LTD PI GODALMING PA SWEETAPPLE HOUSE CATTESHALL RD FARNCOMBE, GODALMING GU7 1NH, SURREY, ENGLAND BN 3-540-76262-0 PY 1998 BP 1812 EP 1817 PG 6 WC Engineering, Multidisciplinary; Multidisciplinary Sciences SC Engineering; Science & Technology - Other Topics GA BP34L UT WOS:000084758100274 ER PT B AU Kimura, CY Brumburgh, G AF Kimura, CY Brumburgh, G BE Mosleh, A Bari, RA TI Aircraft crash hit analysis of the Decontamination and Waste Treatment Facility (DWTF) at the Lawrence Livermore National Laboratory (LLNL) SO PROBABILISTIC SAFETY ASSESSMENT AND MANAGEMENT (PSAM 4), VOLS 1-4 LA English DT Proceedings Paper CT 4th International Conference on Probabilistic Safety Assessment and Management CY SEP 13-18, 1998 CL NEW YORK, NY SP Int Assoc Probabilist Safety Assessment & Management, Amer Inst Chem Engineers, Amer Nucl Soc, Amer Soc Civil Engineers, Amer Soc Mech Engineers, Atom Energy Soc Japan, European Nucl Soc, European Safety & Reliabil Assoc, Fed Aviat Adm, Human Factors Soc, Inst Elect & Electr Engineers, Int Atom Energy Agcy, European Union, Joint Res Ctr, NASA, Org Econ Cooperat & Dev, Soc Risk Analy, Syst Safety Soc, UK Safety & Reliabil Soc, US Coast Guard, US DOE, US Nucl Regulatory Commiss, Associated Univ Inc, Beta Corp Int, BOOZ ALLEN & HAMILTON Inc, Brookhaven Sci Associates, ERIN Engn & Res Inc, PLG Inc, Sci Applicat Int Corp, SCIENTECH INC, Univ Maryland, Ctr Technol Risk Stud C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Kimura, CY (reprint author), Univ Calif Lawrence Livermore Natl Lab, POB 808,L-196, Livermore, CA 94550 USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER-VERLAG LONDON LTD PI GODALMING PA SWEETAPPLE HOUSE CATTESHALL RD FARNCOMBE, GODALMING GU7 1NH, SURREY, ENGLAND BN 3-540-76262-0 PY 1998 BP 1818 EP 1825 PG 8 WC Engineering, Multidisciplinary; Multidisciplinary Sciences SC Engineering; Science & Technology - Other Topics GA BP34L UT WOS:000084758100275 ER PT B AU Cooper, JA Ross, TJ AF Cooper, JA Ross, TJ BE Mosleh, A Bari, RA TI Mathematical relations for incorporating subjective expertise into safety analyses SO PROBABILISTIC SAFETY ASSESSMENT AND MANAGEMENT (PSAM 4), VOLS 1-4 LA English DT Proceedings Paper CT 4th International Conference on Probabilistic Safety Assessment and Management CY SEP 13-18, 1998 CL NEW YORK, NY SP Int Assoc Probabilist Safety Assessment & Management, Amer Inst Chem Engineers, Amer Nucl Soc, Amer Soc Civil Engineers, Amer Soc Mech Engineers, Atom Energy Soc Japan, European Nucl Soc, European Safety & Reliabil Assoc, Fed Aviat Adm, Human Factors Soc, Inst Elect & Electr Engineers, Int Atom Energy Agcy, European Union, Joint Res Ctr, NASA, Org Econ Cooperat & Dev, Soc Risk Analy, Syst Safety Soc, UK Safety & Reliabil Soc, US Coast Guard, US DOE, US Nucl Regulatory Commiss, Associated Univ Inc, Beta Corp Int, BOOZ ALLEN & HAMILTON Inc, Brookhaven Sci Associates, ERIN Engn & Res Inc, PLG Inc, Sci Applicat Int Corp, SCIENTECH INC, Univ Maryland, Ctr Technol Risk Stud AB Safety analyses often depend on significant subjective expertise. Although subjective information can be handled in a variety of ways, optimum selection from the family of mathematical tools available is more important than forced adaptation of conventional tools. In this paper, we describe new approaches that enhance conventional safety analysis by improved handling of subjectivity factors in particular classes of problems. The most significant of the mathematical structures we have investigated (from a standpoint of safety analysis applications) will be described, and the general types of applications will-be outlined. C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Cooper, JA (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER-VERLAG LONDON LTD PI GODALMING PA SWEETAPPLE HOUSE CATTESHALL RD FARNCOMBE, GODALMING GU7 1NH, SURREY, ENGLAND BN 3-540-76262-0 PY 1998 BP 1931 EP 1936 PG 6 WC Engineering, Multidisciplinary; Multidisciplinary Sciences SC Engineering; Science & Technology - Other Topics GA BP34L UT WOS:000084758100292 ER PT B AU Khaleel, MA Simonen, FA AF Khaleel, MA Simonen, FA BE Mosleh, A Bari, RA TI Uncertainty analysis of probabilistic fracture mechanics calculations of piping failure probabilities SO PROBABILISTIC SAFETY ASSESSMENT AND MANAGEMENT (PSAM 4), VOLS 1-4 LA English DT Proceedings Paper CT 4th International Conference on Probabilistic Safety Assessment and Management CY SEP 13-18, 1998 CL NEW YORK, NY SP Int Assoc Probabilist Safety Assessment & Management, Amer Inst Chem Engineers, Amer Nucl Soc, Amer Soc Civil Engineers, Amer Soc Mech Engineers, Atom Energy Soc Japan, European Nucl Soc, European Safety & Reliabil Assoc, Fed Aviat Adm, Human Factors Soc, Inst Elect & Electr Engineers, Int Atom Energy Agcy, European Union, Joint Res Ctr, NASA, Org Econ Cooperat & Dev, Soc Risk Analy, Syst Safety Soc, UK Safety & Reliabil Soc, US Coast Guard, US DOE, US Nucl Regulatory Commiss, Associated Univ Inc, Beta Corp Int, BOOZ ALLEN & HAMILTON Inc, Brookhaven Sci Associates, ERIN Engn & Res Inc, PLG Inc, Sci Applicat Int Corp, SCIENTECH INC, Univ Maryland, Ctr Technol Risk Stud C1 Pacific NW Natl Lab, Richland, WA 99352 USA. RP Khaleel, MA (reprint author), Pacific NW Natl Lab, Richland, WA 99352 USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER-VERLAG LONDON LTD PI GODALMING PA SWEETAPPLE HOUSE CATTESHALL RD FARNCOMBE, GODALMING GU7 1NH, SURREY, ENGLAND BN 3-540-76262-0 PY 1998 BP 2040 EP 2045 PG 6 WC Engineering, Multidisciplinary; Multidisciplinary Sciences SC Engineering; Science & Technology - Other Topics GA BP34L UT WOS:000084758100309 ER PT B AU Nitschke, RL AF Nitschke, RL BE Mosleh, A Bari, RA TI The seven deadly environmental risk communication sins SO PROBABILISTIC SAFETY ASSESSMENT AND MANAGEMENT (PSAM 4), VOLS 1-4 LA English DT Proceedings Paper CT 4th International Conference on Probabilistic Safety Assessment and Management CY SEP 13-18, 1998 CL NEW YORK, NY SP Int Assoc Probabilist Safety Assessment & Management, Amer Inst Chem Engineers, Amer Nucl Soc, Amer Soc Civil Engineers, Amer Soc Mech Engineers, Atom Energy Soc Japan, European Nucl Soc, European Safety & Reliabil Assoc, Fed Aviat Adm, Human Factors Soc, Inst Elect & Electr Engineers, Int Atom Energy Agcy, European Union, Joint Res Ctr, NASA, Org Econ Cooperat & Dev, Soc Risk Analy, Syst Safety Soc, UK Safety & Reliabil Soc, US Coast Guard, US DOE, US Nucl Regulatory Commiss, Associated Univ Inc, Beta Corp Int, BOOZ ALLEN & HAMILTON Inc, Brookhaven Sci Associates, ERIN Engn & Res Inc, PLG Inc, Sci Applicat Int Corp, SCIENTECH INC, Univ Maryland, Ctr Technol Risk Stud AB A major obstacle and sometimes the biggest obstacle facing the resolution of environmental and waste management problems can be attributed to the "failure to communicate" with key players including the public. Now it is fairly easy to assign the cause of the failure to the unenlightened masses or as a former boss of mine said: "Failure to communicate, like hell, I told the bastards and they did not listen!" But it can also be said that there are seven deadly risk communication/risk management sins committed by the owners of the problems that contribute much to this failure. Now these sins range from the simple sin of omission to the more profound sin of "loss of big picture." To a large degree it only takes one sin to complicate the matter, but in point of fact, many risk managers/assessors not only commit more than one of the sins but also commit them repeatedly. It is no wonder that resolution to even the simplest of problems becomes problematic. Now these seven deadly sins can be identified as: the sin of "omission;" the sin of "oversimplification;" the sin of "arrogance;" the sin of "loss of big picture;" the sin of "ignorance;" the sin of "deception;" and the sin of "blind compliance." The first sin is the sin of omission. This sin has a legal analogue where not only the truth but the "whole truth' is requested. Sometimes this sin is committed unwittingly but other times not. The second sin is the sin of oversimplification. Here in a well-intentioned attempt to portray complicated matters in a simple manner, key elements are omitted and misleading and incomplete pictures are presented The third sin is the sin of arrogance. This sin has two heads. One is the head of "I know more than you do;" the other is the " I know what is best for you." The fourth sin is the sin of "loss of big picture." This sin is common in bureaucratic environments where one's only piece of the puzzle is important. The fifth sin is the sin of ignorance. This sin is the failure to know what you don't know. The sixth sin is the sin of deception. This sin manifests itself in such things as hidden agendas and "risk shopping." The last sin is the less common but nonetheless undesirable sin of blind compliance. This sin is primarily committed by those who don't have to pay the bill. This paper will examine the seven deadly sins, will describe their effects, and will suggest ways to combat them. It is hope that by drawing attention to these sins that risk managers and risk assessors will both do their jobs better and take steps to develop a more successful relationship with the public and the regulators. Only by recognition and correction can the risk managers/communicators be absolved and allow for sound, cost-effective and timely decisions. And just maybe, "the bastards will listen!". C1 Lockheed Martin Idaho Technol Co, Idaho Natl Engn & Environm Lab, Idaho Falls, ID 83415 USA. RP Nitschke, RL (reprint author), Lockheed Martin Idaho Technol Co, Idaho Natl Engn & Environm Lab, POB 1625, Idaho Falls, ID 83415 USA. NR 0 TC 0 Z9 0 U1 0 U2 2 PU SPRINGER-VERLAG LONDON LTD PI GODALMING PA SWEETAPPLE HOUSE CATTESHALL RD FARNCOMBE, GODALMING GU7 1NH, SURREY, ENGLAND BN 3-540-76262-0 PY 1998 BP 2173 EP 2178 PG 6 WC Engineering, Multidisciplinary; Multidisciplinary Sciences SC Engineering; Science & Technology - Other Topics GA BP34L UT WOS:000084758100329 ER PT B AU Fischer, SR Clement, S Stack, DW AF Fischer, SR Clement, S Stack, DW BE Mosleh, A Bari, RA TI A new paradigm to establish the safety basis for nuclear explosive operations SO PROBABILISTIC SAFETY ASSESSMENT AND MANAGEMENT (PSAM 4), VOLS 1-4 LA English DT Proceedings Paper CT 4th International Conference on Probabilistic Safety Assessment and Management CY SEP 13-18, 1998 CL NEW YORK, NY SP Int Assoc Probabilist Safety Assessment & Management, Amer Inst Chem Engineers, Amer Nucl Soc, Amer Soc Civil Engineers, Amer Soc Mech Engineers, Atom Energy Soc Japan, European Nucl Soc, European Safety & Reliabil Assoc, Fed Aviat Adm, Human Factors Soc, Inst Elect & Electr Engineers, Int Atom Energy Agcy, European Union, Joint Res Ctr, NASA, Org Econ Cooperat & Dev, Soc Risk Analy, Syst Safety Soc, UK Safety & Reliabil Soc, US Coast Guard, US DOE, US Nucl Regulatory Commiss, Associated Univ Inc, Beta Corp Int, BOOZ ALLEN & HAMILTON Inc, Brookhaven Sci Associates, ERIN Engn & Res Inc, PLG Inc, Sci Applicat Int Corp, SCIENTECH INC, Univ Maryland, Ctr Technol Risk Stud AB The U. S. Department of Energy (DOE) has recognized that safety assurance requires a balance of institutional and engineering approaches as part of an ongoing safety process. This recognition formed the basis for a new approach to nuclear explosive safety with a focus on the inherent value of the examination process, as opposed to an absolute justification of the nuclear explosive operation against some predefined acceptance criteria. This new approach to safety is reflected in recent DOE Orders and Standards in that there is no requirement that quantitative risk assessment or risk quantification be used in meeting requirements. Furthermore, there is no requirement to compare hazard and accident analysis results against numerical acceptance criteria. This paper discusses the evolution of the DOE nuclear explosive safety orders and compares those with facility safety requirements. The DOE nuclear explosive safety process is examined, and an example application is discussed with emphasis on identification of safety measures and controls. C1 Univ Calif Los Alamos Natl Lab, Grp TSA11, Los Alamos, NM 87544 USA. RP Fischer, SR (reprint author), Univ Calif Los Alamos Natl Lab, Grp TSA11, Los Alamos, NM 87544 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER-VERLAG LONDON LTD PI GODALMING PA SWEETAPPLE HOUSE CATTESHALL RD FARNCOMBE, GODALMING GU7 1NH, SURREY, ENGLAND BN 3-540-76262-0 PY 1998 BP 2202 EP 2207 PG 6 WC Engineering, Multidisciplinary; Multidisciplinary Sciences SC Engineering; Science & Technology - Other Topics GA BP34L UT WOS:000084758100334 ER PT B AU Benjamin, AS Brown, NN Paez, TL AF Benjamin, AS Brown, NN Paez, TL BE Mosleh, A Bari, RA TI Dynamic modeling of physical phenomena for PRAs using neural networks SO PROBABILISTIC SAFETY ASSESSMENT AND MANAGEMENT (PSAM 4), VOLS 1-4 LA English DT Proceedings Paper CT 4th International Conference on Probabilistic Safety Assessment and Management CY SEP 13-18, 1998 CL NEW YORK, NY SP Int Assoc Probabilist Safety Assessment & Management, Amer Inst Chem Engineers, Amer Nucl Soc, Amer Soc Civil Engineers, Amer Soc Mech Engineers, Atom Energy Soc Japan, European Nucl Soc, European Safety & Reliabil Assoc, Fed Aviat Adm, Human Factors Soc, Inst Elect & Electr Engineers, Int Atom Energy Agcy, European Union, Joint Res Ctr, NASA, Org Econ Cooperat & Dev, Soc Risk Analy, Syst Safety Soc, UK Safety & Reliabil Soc, US Coast Guard, US DOE, US Nucl Regulatory Commiss, Associated Univ Inc, Beta Corp Int, BOOZ ALLEN & HAMILTON Inc, Brookhaven Sci Associates, ERIN Engn & Res Inc, PLG Inc, Sci Applicat Int Corp, SCIENTECH INC, Univ Maryland, Ctr Technol Risk Stud C1 Sandia Corp, Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Benjamin, AS (reprint author), Sandia Corp, Sandia Natl Labs, Albuquerque, NM 87185 USA. NR 6 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER-VERLAG LONDON LTD PI GODALMING PA SWEETAPPLE HOUSE CATTESHALL RD FARNCOMBE, GODALMING GU7 1NH, SURREY, ENGLAND BN 3-540-76262-0 PY 1998 BP 2211 EP 2216 PG 6 WC Engineering, Multidisciplinary; Multidisciplinary Sciences SC Engineering; Science & Technology - Other Topics GA BP34L UT WOS:000084758100335 ER PT B AU Gertman, DI Hallbert, B Blackman, H Schurman, D Thompson, C AF Gertman, DI Hallbert, B Blackman, H Schurman, D Thompson, C BE Mosleh, A Bari, RA TI Management and organizational factors research: The Socio-Organizational Contribution to Risk Assessment and the Technical Evaluation of Systems (SOCRATES) SO PROBABILISTIC SAFETY ASSESSMENT AND MANAGEMENT (PSAM 4), VOLS 1-4 LA English DT Proceedings Paper CT 4th International Conference on Probabilistic Safety Assessment and Management CY SEP 13-18, 1998 CL NEW YORK, NY SP Int Assoc Probabilist Safety Assessment & Management, Amer Inst Chem Engineers, Amer Nucl Soc, Amer Soc Civil Engineers, Amer Soc Mech Engineers, Atom Energy Soc Japan, European Nucl Soc, European Safety & Reliabil Assoc, Fed Aviat Adm, Human Factors Soc, Inst Elect & Electr Engineers, Int Atom Energy Agcy, European Union, Joint Res Ctr, NASA, Org Econ Cooperat & Dev, Soc Risk Analy, Syst Safety Soc, UK Safety & Reliabil Soc, US Coast Guard, US DOE, US Nucl Regulatory Commiss, Associated Univ Inc, Beta Corp Int, BOOZ ALLEN & HAMILTON Inc, Brookhaven Sci Associates, ERIN Engn & Res Inc, PLG Inc, Sci Applicat Int Corp, SCIENTECH INC, Univ Maryland, Ctr Technol Risk Stud AB Contemporary research in risk and safety across a variety of industries strongly suggests the role of organizational factors in operational and public safety. Recent work sponsored by the US Nuclear Regulatory Commission (NRC) has sought to better understand the role of these management and organizational (M&O) factors in plant performance and risk. As part of this effort, a model for conceptualizing the contribution of M&O to risk has been formulated. This paper reviews the model, and ongoing research efforts to extend the envelope of causality in the risk assessment process, and to explicitly consider the influence of M&O factors in plant performance and risk. C1 Idaho Natl Engn & Environm Lab, Idaho Falls, ID USA. RP Gertman, DI (reprint author), Idaho Natl Engn & Environm Lab, Idaho Falls, ID USA. RI Hallbert, Bruce/B-5435-2017 OI Hallbert, Bruce/0000-0002-4133-7625 NR 0 TC 1 Z9 1 U1 0 U2 0 PU SPRINGER-VERLAG LONDON LTD PI GODALMING PA SWEETAPPLE HOUSE CATTESHALL RD FARNCOMBE, GODALMING GU7 1NH, SURREY, ENGLAND BN 3-540-76262-0 PY 1998 BP 2289 EP 2295 PG 7 WC Engineering, Multidisciplinary; Multidisciplinary Sciences SC Engineering; Science & Technology - Other Topics GA BP34L UT WOS:000084758100347 ER PT B AU Blackman, HS Gertman, DI Hallbert, BP Schurman, DL Thompson, C AF Blackman, HS Gertman, DI Hallbert, BP Schurman, DL Thompson, C BE Mosleh, A Bari, RA TI Integrating safety culture SO PROBABILISTIC SAFETY ASSESSMENT AND MANAGEMENT (PSAM 4), VOLS 1-4 LA English DT Proceedings Paper CT 4th International Conference on Probabilistic Safety Assessment and Management CY SEP 13-18, 1998 CL NEW YORK, NY SP Int Assoc Probabilist Safety Assessment & Management, Amer Inst Chem Engineers, Amer Nucl Soc, Amer Soc Civil Engineers, Amer Soc Mech Engineers, Atom Energy Soc Japan, European Nucl Soc, European Safety & Reliabil Assoc, Fed Aviat Adm, Human Factors Soc, Inst Elect & Electr Engineers, Int Atom Energy Agcy, European Union, Joint Res Ctr, NASA, Org Econ Cooperat & Dev, Soc Risk Analy, Syst Safety Soc, UK Safety & Reliabil Soc, US Coast Guard, US DOE, US Nucl Regulatory Commiss, Associated Univ Inc, Beta Corp Int, BOOZ ALLEN & HAMILTON Inc, Brookhaven Sci Associates, ERIN Engn & Res Inc, PLG Inc, Sci Applicat Int Corp, SCIENTECH INC, Univ Maryland, Ctr Technol Risk Stud AB NRC is tasked with assessment, inspection, and regulation of commercial nuclear facilities. In recent years, the scientific community has been able, through analysis of operating events both here and abroad, to determine that management and organization, including safety culture, may play an important role in event initiation, management and recovery. Moreover, there may be a need to deepen the understanding of processes at nuclear power plants (NPPs) that relate to risk. There may be a need to develop tools that assist staff to inspect and assess management and organization factors that influence safety, including safety culture. Since safety culture is believed to be a lending indicator of human and plant performance, assessment will contribute to more effective and proactive regulation. C1 Idaho Natl Engn & Environm Lab, Idaho Falls, ID USA. RP Blackman, HS (reprint author), Idaho Natl Engn & Environm Lab, Idaho Falls, ID USA. RI Hallbert, Bruce/B-5435-2017 OI Hallbert, Bruce/0000-0002-4133-7625 NR 5 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER-VERLAG LONDON LTD PI GODALMING PA SWEETAPPLE HOUSE CATTESHALL RD FARNCOMBE, GODALMING GU7 1NH, SURREY, ENGLAND BN 3-540-76262-0 PY 1998 BP 2296 EP 2302 PG 7 WC Engineering, Multidisciplinary; Multidisciplinary Sciences SC Engineering; Science & Technology - Other Topics GA BP34L UT WOS:000084758100348 ER PT B AU Hsu, F Azarm, MA AF Hsu, F Azarm, MA BE Mosleh, A Bari, RA TI Evaluation of stochastic variation of ASP database through simulation SO PROBABILISTIC SAFETY ASSESSMENT AND MANAGEMENT (PSAM 4), VOLS 1-4 LA English DT Proceedings Paper CT 4th International Conference on Probabilistic Safety Assessment and Management CY SEP 13-18, 1998 CL NEW YORK, NY SP Int Assoc Probabilist Safety Assessment & Management, Amer Inst Chem Engineers, Amer Nucl Soc, Amer Soc Civil Engineers, Amer Soc Mech Engineers, Atom Energy Soc Japan, European Nucl Soc, European Safety & Reliabil Assoc, Fed Aviat Adm, Human Factors Soc, Inst Elect & Electr Engineers, Int Atom Energy Agcy, European Union, Joint Res Ctr, NASA, Org Econ Cooperat & Dev, Soc Risk Analy, Syst Safety Soc, UK Safety & Reliabil Soc, US Coast Guard, US DOE, US Nucl Regulatory Commiss, Associated Univ Inc, Beta Corp Int, BOOZ ALLEN & HAMILTON Inc, Brookhaven Sci Associates, ERIN Engn & Res Inc, PLG Inc, Sci Applicat Int Corp, SCIENTECH INC, Univ Maryland, Ctr Technol Risk Stud AB This paper presents a new perspective on evaluating the nuclear reactor risk indicated by the CCDF (Conditional Core Damage Frequency) values. A preliminary attempt is made to estimate the industrial wide core damage frequency through constructing of a specific risk measurement called as the CDI (Core Damage Index). The Monte Carlo simulation method is also used to address the uncertainties of the underlying estimated CDIs. It is observed that the variations seen in the actual plant specific ASP data is consistent with the stochastic variations expected from the random occurrence of ASP events. C1 Brookhaven Natl Lab, Dept Adv Technol, Upton, NY 11973 USA. RP Hsu, F (reprint author), Brookhaven Natl Lab, Dept Adv Technol, Upton, NY 11973 USA. NR 6 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER-VERLAG LONDON LTD PI GODALMING PA SWEETAPPLE HOUSE CATTESHALL RD FARNCOMBE, GODALMING GU7 1NH, SURREY, ENGLAND BN 3-540-76262-0 PY 1998 BP 2329 EP 2335 PG 7 WC Engineering, Multidisciplinary; Multidisciplinary Sciences SC Engineering; Science & Technology - Other Topics GA BP34L UT WOS:000084758100353 ER PT B AU Martz, HF AF Martz, HF BE Mosleh, A Bari, RA TI Core damage frequency estimation using accident sequence precursor data: 1990-1993 SO PROBABILISTIC SAFETY ASSESSMENT AND MANAGEMENT (PSAM 4), VOLS 1-4 LA English DT Proceedings Paper CT 4th International Conference on Probabilistic Safety Assessment and Management CY SEP 13-18, 1998 CL NEW YORK, NY SP Int Assoc Probabilist Safety Assessment & Management, Amer Inst Chem Engineers, Amer Nucl Soc, Amer Soc Civil Engineers, Amer Soc Mech Engineers, Atom Energy Soc Japan, European Nucl Soc, European Safety & Reliabil Assoc, Fed Aviat Adm, Human Factors Soc, Inst Elect & Electr Engineers, Int Atom Energy Agcy, European Union, Joint Res Ctr, NASA, Org Econ Cooperat & Dev, Soc Risk Analy, Syst Safety Soc, UK Safety & Reliabil Soc, US Coast Guard, US DOE, US Nucl Regulatory Commiss, Associated Univ Inc, Beta Corp Int, BOOZ ALLEN & HAMILTON Inc, Brookhaven Sci Associates, ERIN Engn & Res Inc, PLG Inc, Sci Applicat Int Corp, SCIENTECH INC, Univ Maryland, Ctr Technol Risk Stud C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87544 USA. RP Martz, HF (reprint author), Univ Calif Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87544 USA. NR 27 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER-VERLAG LONDON LTD PI GODALMING PA SWEETAPPLE HOUSE CATTESHALL RD FARNCOMBE, GODALMING GU7 1NH, SURREY, ENGLAND BN 3-540-76262-0 PY 1998 BP 2344 EP 2349 PG 6 WC Engineering, Multidisciplinary; Multidisciplinary Sciences SC Engineering; Science & Technology - Other Topics GA BP34L UT WOS:000084758100355 ER PT B AU Pratt, WT Mubayi, V Nourbakhsh, H Brown, T Gregory, J AF Pratt, WT Mubayi, V Nourbakhsh, H Brown, T Gregory, J BE Mosleh, A Bari, RA TI Simplified approach for estimating large early release frequency SO PROBABILISTIC SAFETY ASSESSMENT AND MANAGEMENT (PSAM 4), VOLS 1-4 LA English DT Proceedings Paper CT 4th International Conference on Probabilistic Safety Assessment and Management CY SEP 13-18, 1998 CL NEW YORK, NY SP Int Assoc Probabilist Safety Assessment & Management, Amer Inst Chem Engineers, Amer Nucl Soc, Amer Soc Civil Engineers, Amer Soc Mech Engineers, Atom Energy Soc Japan, European Nucl Soc, European Safety & Reliabil Assoc, Fed Aviat Adm, Human Factors Soc, Inst Elect & Electr Engineers, Int Atom Energy Agcy, European Union, Joint Res Ctr, NASA, Org Econ Cooperat & Dev, Soc Risk Analy, Syst Safety Soc, UK Safety & Reliabil Soc, US Coast Guard, US DOE, US Nucl Regulatory Commiss, Associated Univ Inc, Beta Corp Int, BOOZ ALLEN & HAMILTON Inc, Brookhaven Sci Associates, ERIN Engn & Res Inc, PLG Inc, Sci Applicat Int Corp, SCIENTECH INC, Univ Maryland, Ctr Technol Risk Stud AB The U.S. Nuclear Regulatory Commission (NRC) Policy Statement related to Probabilistic Risk Analysis (PRA) encourages greater use of PRA techniques to improve safety decisionmaking and enhance regulatory efficiency. One activity in response to this policy statement is the use of PRA in support of decisions related to modifying a plant's licensing basis (LB). Risk metrics such as core damage frequency (CDF) and Large Early Release Frequency (LERF) are recommended for use in making risk-informed regulatory decisions and also for establishing acceptance guidelines. This paper describes a simplified approach for estimating LERF, and-changes in LERF resulting from changes to a plant's LB. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Pratt, WT (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER-VERLAG LONDON LTD PI GODALMING PA SWEETAPPLE HOUSE CATTESHALL RD FARNCOMBE, GODALMING GU7 1NH, SURREY, ENGLAND BN 3-540-76262-0 PY 1998 BP 2539 EP 2544 PG 6 WC Engineering, Multidisciplinary; Multidisciplinary Sciences SC Engineering; Science & Technology - Other Topics GA BP34L UT WOS:000084758100383 ER PT B AU Majumdar, K Altenbach, T AF Majumdar, K Altenbach, T BE Mosleh, A Bari, RA TI A graded approach for initiating event selection in a facility hazard analysis SO PROBABILISTIC SAFETY ASSESSMENT AND MANAGEMENT (PSAM 4), VOLS 1-4 LA English DT Proceedings Paper CT 4th International Conference on Probabilistic Safety Assessment and Management CY SEP 13-18, 1998 CL NEW YORK, NY SP Int Assoc Probabilist Safety Assessment & Management, Amer Inst Chem Engineers, Amer Nucl Soc, Amer Soc Civil Engineers, Amer Soc Mech Engineers, Atom Energy Soc Japan, European Nucl Soc, European Safety & Reliabil Assoc, Fed Aviat Adm, Human Factors Soc, Inst Elect & Electr Engineers, Int Atom Energy Agcy, European Union, Joint Res Ctr, NASA, Org Econ Cooperat & Dev, Soc Risk Analy, Syst Safety Soc, UK Safety & Reliabil Soc, US Coast Guard, US DOE, US Nucl Regulatory Commiss, Associated Univ Inc, Beta Corp Int, BOOZ ALLEN & HAMILTON Inc, Brookhaven Sci Associates, ERIN Engn & Res Inc, PLG Inc, Sci Applicat Int Corp, SCIENTECH INC, Univ Maryland, Ctr Technol Risk Stud AB This paper describes a methodology for selecting initiating events or event scenarios for the hazard analysis of a new Department of Energy (DOE) facility at the Nevada test site for nuclear explosive operations called the Device Assembly Facility (DAF). The selection process is a very important first step in conducting the hazard analysis for the facility, which in turn may feed into a quantitative risk analysis. A comprehensive risk analysis is dependent on the identification and inclusion of a complete set of initiating events in the analysis model. A systematic and logical method of grading or screening all the potential initiating events satisfies the needs for completeness within the bounds of efficiency and practicality. By applying the graded approach to the selection of the initiating events, the task and hazard analysis was able to focus its attention on only those events having the potential to develop into credible accident scenarios. Resources were concentrated into the understanding of those scenarios, and assuring that adequate positive measures are in place to control the risk associated with them. C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Majumdar, K (reprint author), Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. NR 2 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER-VERLAG LONDON LTD PI GODALMING PA SWEETAPPLE HOUSE CATTESHALL RD FARNCOMBE, GODALMING GU7 1NH, SURREY, ENGLAND BN 3-540-76262-0 PY 1998 BP 2754 EP 2759 PG 6 WC Engineering, Multidisciplinary; Multidisciplinary Sciences SC Engineering; Science & Technology - Other Topics GA BP34L UT WOS:000084758100416 ER PT B AU Brereton, S Lane, M Smith, C Yatabe, J AF Brereton, S Lane, M Smith, C Yatabe, J BE Mosleh, A Bari, RA TI Risk management plan for the National Ignition Facility SO PROBABILISTIC SAFETY ASSESSMENT AND MANAGEMENT (PSAM 4), VOLS 1-4 LA English DT Proceedings Paper CT 4th International Conference on Probabilistic Safety Assessment and Management CY SEP 13-18, 1998 CL NEW YORK, NY SP Int Assoc Probabilist Safety Assessment & Management, Amer Inst Chem Engineers, Amer Nucl Soc, Amer Soc Civil Engineers, Amer Soc Mech Engineers, Atom Energy Soc Japan, European Nucl Soc, European Safety & Reliabil Assoc, Fed Aviat Adm, Human Factors Soc, Inst Elect & Electr Engineers, Int Atom Energy Agcy, European Union, Joint Res Ctr, NASA, Org Econ Cooperat & Dev, Soc Risk Analy, Syst Safety Soc, UK Safety & Reliabil Soc, US Coast Guard, US DOE, US Nucl Regulatory Commiss, Associated Univ Inc, Beta Corp Int, BOOZ ALLEN & HAMILTON Inc, Brookhaven Sci Associates, ERIN Engn & Res Inc, PLG Inc, Sci Applicat Int Corp, SCIENTECH INC, Univ Maryland, Ctr Technol Risk Stud C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. RP Brereton, S (reprint author), Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA. NR 2 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER-VERLAG LONDON LTD PI GODALMING PA SWEETAPPLE HOUSE CATTESHALL RD FARNCOMBE, GODALMING GU7 1NH, SURREY, ENGLAND BN 3-540-76262-0 PY 1998 BP 2807 EP 2812 PG 6 WC Engineering, Multidisciplinary; Multidisciplinary Sciences SC Engineering; Science & Technology - Other Topics GA BP34L UT WOS:000084758100424 ER PT B AU Hicks, MJ Yates, D Jago, WH Phillips, AW AF Hicks, MJ Yates, D Jago, WH Phillips, AW BE Mosleh, A Bari, RA TI Cost and performance analysis of physical security systems SO PROBABILISTIC SAFETY ASSESSMENT AND MANAGEMENT (PSAM 4), VOLS 1-4 LA English DT Proceedings Paper CT 4th International Conference on Probabilistic Safety Assessment and Management CY SEP 13-18, 1998 CL NEW YORK, NY SP Int Assoc Probabilist Safety Assessment & Management, Amer Inst Chem Engineers, Amer Nucl Soc, Amer Soc Civil Engineers, Amer Soc Mech Engineers, Atom Energy Soc Japan, European Nucl Soc, European Safety & Reliabil Assoc, Fed Aviat Adm, Human Factors Soc, Inst Elect & Electr Engineers, Int Atom Energy Agcy, European Union, Joint Res Ctr, NASA, Org Econ Cooperat & Dev, Soc Risk Analy, Syst Safety Soc, UK Safety & Reliabil Soc, US Coast Guard, US DOE, US Nucl Regulatory Commiss, Associated Univ Inc, Beta Corp Int, BOOZ ALLEN & HAMILTON Inc, Brookhaven Sci Associates, ERIN Engn & Res Inc, PLG Inc, Sci Applicat Int Corp, SCIENTECH INC, Univ Maryland, Ctr Technol Risk Stud AB Analysis of cost and performance of physical security systems can be a complex, multi-dimensional problem. There are a number of point tools that address various aspects of cost and performance analysis. Increased interest in cost tradeoffs of physical security alternatives has motivated development of an architecture called Cost and Performance Analysis (CPA), which takes a top-down approach to aligning cost and performance metrics. CPA incorporates results generated by established performance analysis tools for physical security systems, and utilizes an established cost analysis tool. The objective of this architecture is to offer comprehensive visualization of complex data to security analysts and decision-makers. C1 Sandia Natl Labs, Albuquerque, NM 87185 USA. RP Hicks, MJ (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA. NR 6 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER-VERLAG LONDON LTD PI GODALMING PA SWEETAPPLE HOUSE CATTESHALL RD FARNCOMBE, GODALMING GU7 1NH, SURREY, ENGLAND BN 3-540-76262-0 PY 1998 BP 2845 EP 2850 PG 6 WC Engineering, Multidisciplinary; Multidisciplinary Sciences SC Engineering; Science & Technology - Other Topics GA BP34L UT WOS:000084758100430 ER PT B AU Konkel, H AF Konkel, H BE Mosleh, A Bari, RA TI Electric potential transfer through grounding and the concern for facility and worker safety SO PROBABILISTIC SAFETY ASSESSMENT AND MANAGEMENT (PSAM 4), VOLS 1-4 LA English DT Proceedings Paper CT 4th International Conference on Probabilistic Safety Assessment and Management CY SEP 13-18, 1998 CL NEW YORK, NY SP Int Assoc Probabilist Safety Assessment & Management, Amer Inst Chem Engineers, Amer Nucl Soc, Amer Soc Civil Engineers, Amer Soc Mech Engineers, Atom Energy Soc Japan, European Nucl Soc, European Safety & Reliabil Assoc, Fed Aviat Adm, Human Factors Soc, Inst Elect & Electr Engineers, Int Atom Energy Agcy, European Union, Joint Res Ctr, NASA, Org Econ Cooperat & Dev, Soc Risk Analy, Syst Safety Soc, UK Safety & Reliabil Soc, US Coast Guard, US DOE, US Nucl Regulatory Commiss, Associated Univ Inc, Beta Corp Int, BOOZ ALLEN & HAMILTON Inc, Brookhaven Sci Associates, ERIN Engn & Res Inc, PLG Inc, Sci Applicat Int Corp, SCIENTECH INC, Univ Maryland, Ctr Technol Risk Stud C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87544 USA. RP Konkel, H (reprint author), Univ Calif Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87544 USA. NR 2 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER-VERLAG LONDON LTD PI GODALMING PA SWEETAPPLE HOUSE CATTESHALL RD FARNCOMBE, GODALMING GU7 1NH, SURREY, ENGLAND BN 3-540-76262-0 PY 1998 BP 2853 EP 2858 PG 6 WC Engineering, Multidisciplinary; Multidisciplinary Sciences SC Engineering; Science & Technology - Other Topics GA BP34L UT WOS:000084758100431 ER PT B AU Knudson, DL Ghan, LS AF Knudson, DL Ghan, LS BE Mosleh, A Bari, RA TI Factors influencing the potential for steam generator tube rupture in pressurized water reactors SO PROBABILISTIC SAFETY ASSESSMENT AND MANAGEMENT (PSAM 4), VOLS 1-4 LA English DT Proceedings Paper CT 4th International Conference on Probabilistic Safety Assessment and Management CY SEP 13-18, 1998 CL NEW YORK, NY SP Int Assoc Probabilist Safety Assessment & Management, Amer Inst Chem Engineers, Amer Nucl Soc, Amer Soc Civil Engineers, Amer Soc Mech Engineers, Atom Energy Soc Japan, European Nucl Soc, European Safety & Reliabil Assoc, Fed Aviat Adm, Human Factors Soc, Inst Elect & Electr Engineers, Int Atom Energy Agcy, European Union, Joint Res Ctr, NASA, Org Econ Cooperat & Dev, Soc Risk Analy, Syst Safety Soc, UK Safety & Reliabil Soc, US Coast Guard, US DOE, US Nucl Regulatory Commiss, Associated Univ Inc, Beta Corp Int, BOOZ ALLEN & HAMILTON Inc, Brookhaven Sci Associates, ERIN Engn & Res Inc, PLG Inc, Sci Applicat Int Corp, SCIENTECH INC, Univ Maryland, Ctr Technol Risk Stud C1 Idaho Natl Engn & Environm Lab, Idaho Falls, ID 83415 USA. RP Knudson, DL (reprint author), Idaho Natl Engn & Environm Lab, Idaho Falls, ID 83415 USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER-VERLAG LONDON LTD PI GODALMING PA SWEETAPPLE HOUSE CATTESHALL RD FARNCOMBE, GODALMING GU7 1NH, SURREY, ENGLAND BN 3-540-76262-0 PY 1998 BP 2879 EP 2884 PG 6 WC Engineering, Multidisciplinary; Multidisciplinary Sciences SC Engineering; Science & Technology - Other Topics GA BP34L UT WOS:000084758100435 ER PT B AU Rempe, JL Knudson, DL Atwood, CL Cebull, MJ AF Rempe, JL Knudson, DL Atwood, CL Cebull, MJ BE Mosleh, A Bari, RA TI Impact of uncertainties on the response of an externally flooded vessel SO PROBABILISTIC SAFETY ASSESSMENT AND MANAGEMENT (PSAM 4), VOLS 1-4 LA English DT Proceedings Paper CT 4th International Conference on Probabilistic Safety Assessment and Management CY SEP 13-18, 1998 CL NEW YORK, NY SP Int Assoc Probabilist Safety Assessment & Management, Amer Inst Chem Engineers, Amer Nucl Soc, Amer Soc Civil Engineers, Amer Soc Mech Engineers, Atom Energy Soc Japan, European Nucl Soc, European Safety & Reliabil Assoc, Fed Aviat Adm, Human Factors Soc, Inst Elect & Electr Engineers, Int Atom Energy Agcy, European Union, Joint Res Ctr, NASA, Org Econ Cooperat & Dev, Soc Risk Analy, Syst Safety Soc, UK Safety & Reliabil Soc, US Coast Guard, US DOE, US Nucl Regulatory Commiss, Associated Univ Inc, Beta Corp Int, BOOZ ALLEN & HAMILTON Inc, Brookhaven Sci Associates, ERIN Engn & Res Inc, PLG Inc, Sci Applicat Int Corp, SCIENTECH INC, Univ Maryland, Ctr Technol Risk Stud ID NICKEL C1 Idaho Natl Engn & Environm Lab, Idaho Falls, ID 83405 USA. RP Rempe, JL (reprint author), Idaho Natl Engn & Environm Lab, Idaho Falls, ID 83405 USA. NR 19 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER-VERLAG LONDON LTD PI GODALMING PA SWEETAPPLE HOUSE CATTESHALL RD FARNCOMBE, GODALMING GU7 1NH, SURREY, ENGLAND BN 3-540-76262-0 PY 1998 BP 2885 EP 2890 PG 6 WC Engineering, Multidisciplinary; Multidisciplinary Sciences SC Engineering; Science & Technology - Other Topics GA BP34L UT WOS:000084758100436 ER PT S AU Sick, G Allen, D McGee, BD Walker, R AF Sick, G Allen, D McGee, BD Walker, R GP INT EROSION CONTROL ASSOC TI One government - Getting the most for your resource management dollar SO PROCEEDINGS OF CONFERENCE 29 - INTERNATIONAL EROSION CONTROL ASSOCIATION SE INTERNATIONAL EROSION CONTROL ASSOCIATION - PROCEEDINGS OF CONFERENCE LA English DT Proceedings Paper CT Conference 29 of the International-Erosion-Control-Association on Winning Solutions for Risky Problems CY FEB 16-20, 1998 CL RENO, NV SP Int Eros Control Assoc AB Long before "government reinvention" became the mission of the Clinton administration many federal agencies had found ways to work with each other to accomplish day to day tasks as well as special projects. Cooperation was not uncommon! In South Carolina at the Savannah River Site, a Department of Energy facility, and at Fort Jackson, a Department of Defense facility, there are long-standing, model programs for collaboration. These programs demonstrate the efficiencies of interagency resource management and should be implemented at other federal facilities. The longest term of these arrangements is between the USDA Forest Service and the Department of Energy at the Savannah River Site. The original agreement, signed in 1952, charged the Forest Service with reforesting the mostly open 80,000 hectare site. Since 1952 the agreement has evolved to comprehensive natural resource management including erosion control, research, timber harvest, education, threatened and endangered species management and other activities. Also at the Savannah River Site the USDA Soil Conservation Service (now NRCS) entered into an agreement with the Department of Energy to conduct an inventory and prepare the soil survey. This agreement too has continuously evolved, and now includes responsibility for inventories, field assistance, erosion control, and storm water management. At Fort Jackson (21,000 hectares) the USDA Natural Resources Conservation Service and USDA Forest Service are providing daily support to the Army. The NRCS began working on critically eroding areas of the fort in 1991, and has now extended its agreement with the Army indefinitely. For about the same period the Forest Service has assisted with prescribed burning and endangered species management. The Departments of Energy and Defense are tapping the most experienced natural resource management agencies in federal government for quality personnel rather than developing their own. Both Fort Jackson and the Savannah River Site are undergoing mission changes and modernization. Each covers a large land base rich in natural resources. The potential environmental effects from day-to-day operations as well as modernization are substantial. Through these cooperative arrangements the managing agencies are able to obtain expert guidance for environmental controls on new projects as well as project design and implementation for sediment and erosion control. These "on-loan" employees have their parent organizations to support them when needed. They also learn new management objectives and approaches from their host agency. We believe these types of arrangements are under-utilized; that there are many opportunities for further collaboration. This poster displays information about the history of this collaboration, lists some representative program and project costs, and displays successful project implementation. C1 US Forest Serv, USDA, New Ellenton, SC 29809 USA. RP Sick, G (reprint author), US Forest Serv, USDA, Savannah River Site,POB 710, New Ellenton, SC 29809 USA. NR 0 TC 0 Z9 0 U1 1 U2 1 PU INT EROSION CONTROL ASSOC PI STEAMBOAT SPRINGS PA PO BOX 4904, STEAMBOAT SPRINGS, CO 80477 USA SN 1092-2806 J9 IECA P CONF PY 1998 VL 29 BP 493 EP 496 PG 4 WC Engineering, Environmental; Engineering, Geological; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA BK89F UT WOS:000073814100039 ER PT B AU Syn, CK Krulewich, DA Davis, PJ McClellan, MR DuPuy, PC Wall, MA Blaedel, KL AF Syn, CK Krulewich, DA Davis, PJ McClellan, MR DuPuy, PC Wall, MA Blaedel, KL GP AMER SOC PRECIS ENGN AMER SOC PRECIS ENGN TI An empirical survey on the influence of machining parameters in diamond turning of large single crystal silicon optics SO PROCEEDINGS OF: SILICON MACHINING: 1998 SPRING TOPICAL MEETING LA English DT Proceedings Paper CT 1998 Spring Topical Meeting of the ASPE on Silicon Machining CY APR 13-16, 1998 CL CARMEL BY THE SEA, CA SP Amer Soc Precis Engn AB A series of Si diamond turning tests was conducted to survey the influence of machining parameters on tool wear and subsurface damage (SSD) in long distance cutting. The survey test matrix was selected by an experimental design technique. The machining parameters included in the test matrix were two settings of depth-of-cut, feed rate, surface speed, tool radius, tool rake and tool skew, and three different fluids. Tool wear was measured by the amount of tool edge recession and wear volume, and subsurface damage was evaluated from the damage layer thickness observed by cross-sectional transmission electron microscopy. The results (within the limits of these experiments) shows that a large DOC produced the lowest SSD and tool wear; feedrate had a conflicting effect on the tool wear and SSD; skew angle also had a conflicting effect on SSD for two crystallographic orientations, [100] and [110]; the third cutting fluid had a significant effect on SSD; a high cutting speed did not affect SSD but shown to reduce tool wear. C1 Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. RP Syn, CK (reprint author), Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94551 USA. NR 10 TC 6 Z9 6 U1 0 U2 0 PU AMER SOC PRECISION ENGINEERING PI RALEIGH PA 401 OBERLIN RD, SUITE 108, PO BOX 10826, RALEIGH, NC 27605-0826 USA BN 1-887706-19-4 PY 1998 BP 44 EP 49 PG 6 WC Engineering, Manufacturing; Engineering, Mechanical; Materials Science, Multidisciplinary SC Engineering; Materials Science GA BM99K UT WOS:000080375400011 ER PT B AU Spentzouris, LK Colestock, PL AF Spentzouris, LK Colestock, PL BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Coherent nonlinear longitudinal phenomena in unbunched synchrotron beams SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Coherent nonlinear longitudinal dynamics have been investigated in unbunched hadron beams[1]. These phenomena may be described using a theoretical framework originally developed to describe interactions in plasmas[2]. Processes exhibiting the weakest degree of nonlinearity are known as wave-wave interactions. Manifestations of these interactions may be used to help characterize a beam. Echoes have been used to measure the collisional damping rate of weak diffusive processes which degrade a stored beam. Further information is contained in the echo shape, which depends on the form of the particle energy distribution. The echo shape may also be modified by the presence of wakefields, or nonlinearities in the machine lattice which affect the longitudinal motion of the particles. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Spentzouris, LK (reprint author), Fermi 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 0-7803-4376-X PY 1998 BP 16 EP 19 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800004 ER PT B AU Appleton, BR AF Appleton, BR CA NSNS Collaboration BE Comyn, M Craddock, MK Reiser, M Thomson, J TI The National Spallation Neutron Source (NSNS) project SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The need and justification for new sources and instrumentation in neutron science have been firmly established by numerous assessments since the early 1970s by the scientific community and the U.S. Department of Energy (DOE). In their 1996 budget, the DOE Office of Energy Research asked ORNL to lead the R&D and conceptual design effort for a next-generation spallation neutron source to be used for neutron scattering. To accomplish this, the NSNS collaboration involving five national laboratories (ANL, BNL, LANL, LBNL, and ORNL) has been formed. The NSNS reference design is for a 1-GeV linac and accumulator ring which delivers 1-MW proton beams in microsecond pulses to a mercury target; neutrons are produced by the spallation reaction, moderated, and guided into an experimental hall for neutron scattering. The design includes the necessary flexibility to upgrade the source in stages to significantly higher powers in the future and to expand the experimental capabilities. This paper describes the origins of NSNS, the current funding status, progress on the technical design, user community input and intended uses, and future prospects. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Appleton, BR (reprint author), Oak Ridge Natl Lab, POB 2008, Oak Ridge, TN 37831 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 0-7803-4376-X PY 1998 BP 20 EP 23 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800005 ER PT B AU Peoples, J AF Peoples, J BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Future directions of high energy physics SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Peoples, J (reprint author), Fermi Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. NR 0 TC 2 Z9 2 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 29 EP 33 PG 5 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800007 ER PT B AU Winick, H AF Winick, H BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Fourth generation light sources SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res ID SHORT-WAVELENGTH FELS; STORAGE-RINGS; X-RAY; RADIATION; UNDULATOR C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Winick, H (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 34 TC 1 Z9 1 U1 1 U2 2 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 37 EP 41 PG 5 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800009 ER PT B AU Weng, WT AF Weng, WT BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Ultra-high intensity proton accelerators and their applications SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The science and technology of proton accelerators have progressed considerably in the past three decades. Three to four orders of magnitude increase in both peak intensity and average flux have made it possible to construct high intensity proton accelerators for modern applications, such as: spallation neutron sources, kaon factory, accelerator production of tritium, energy amplifier and muon collider drivers. The accelerator design focus switched over from intensity for synchrotrons, to brightness for colliders to halos for spallation sources. An overview of this tremendous progress in both accelerator science and technology is presented, with special emphasis on the new challenges of accelerator physics issues such as: H- injection, halo formation and reduction of losses. C1 Brookhaven Natl Lab, AGS Dept, Upton, NY 11973 USA. RP Weng, WT (reprint author), Brookhaven Natl Lab, AGS Dept, Upton, NY 11973 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 0-7803-4376-X PY 1998 BP 42 EP 46 PG 5 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800010 ER PT B AU Holmes, SD AF Holmes, SD BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Status of the Fermilab Main Injector and recycler SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The Fermilab Main Injector is a new 150 GeV synchrotron under construction at the Fermi National Accelerator Laboratory. The FMI has been designed to support a factor of five increase in luminosity available from the Tevatron proton-antiproton collider while simultaneously providing a 2 mA resonantly extracted 120 GeV proton beam. Recently a new antiproton storage ring, the Recycler, has been incorporated within the scope of the project with an expected luminosity gain of a factor of two. Project status, schedule for completion, and expected performance characteristics of the Main Injector and Recycler will be presented. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Holmes, SD (reprint author), Fermi 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 0-7803-4376-X PY 1998 BP 47 EP 50 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800011 ER PT B AU Peggs, S AF Peggs, S BE Comyn, M Craddock, MK Reiser, M Thomson, J TI RHIC status SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The design and construction status of the Relativistic Heavy Ion Collider, RHIC, which is in the seventh year of a nine year construction cycle, is discussed. Those novel performance features of a heavy ion collider that are distinct from hadron colliders in general are noted. These features are derived from the experimental requirements of operation with a variety of ion species over a wide energy range, including collisions between protons and ions, and between ions of unequal energies. Section 1 gives a brief introduction to the major parameters and overall layout of RHIC. A review of the superconducting magnet program is given in Section 2. Activities during the recent Sextant Test are briefly reviewed in Section 3. Finally, Section 4 presents the plans for RHIC commissioning in 1999. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Peggs, S (reprint author), Brookhaven Natl Lab, Upton, NY 11973 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 0-7803-4376-X PY 1998 BP 56 EP 60 PG 5 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800013 ER PT B AU Wei, J Fischer, W Ahrens, L Brennan, JM Brown, K Connolly, R Dell, GF Harrison, M Kewisch, J MacKay, WW Mane, V Peggs, S Pilat, F Satogata, T Tanaka, M Tepikian, S Thompson, P Trahern, CG Trbojevic, D Tsoupas, N AF Wei, J Fischer, W Ahrens, L Brennan, JM Brown, K Connolly, R Dell, GF Harrison, M Kewisch, J MacKay, WW Mane, V Peggs, S Pilat, F Satogata, T Tanaka, M Tepikian, S Thompson, P Trahern, CG Trbojevic, D Tsoupas, N BE Comyn, M Craddock, MK Reiser, M Thomson, J TI RHIC Sextant test - Physics and performance SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB This paper presents beam physics and machine performance results. of the Relativistic Heavy Ion Collider (RHIC) Sextant and AGS-to-RHIC (AtR) transfer line during the Sextant Test in early 1997. Techniques used to measure both machine properties (difference orbits, dispersion, and beamline optics) and beam parameters (energy, intensity, transverse and longitudinal emittances) are described. Good agreement was achieved between measured and design lattice optics. The gold ion beam quality was shown to approach RHIC design requirements. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Wei, 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 0-7803-4376-X PY 1998 BP 69 EP 71 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800016 ER PT B AU Martens, MA Marriner, J Holt, J AF Martens, MA Marriner, J Holt, J BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Measurement of Tevatron extraction parameters and comparison of model to measurements SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB An accurate model of the half integer resonance extraction process in the Tevatron requires a knowledge of the extraction parameters such as the strengths of the 39th harmonic quadrupole and 0th harmonic octupole. This paper describes a series of experiments that determine the extraction parameters. Results of target wire scans, which measure the profile of the extracted beam, are then compared to the Tevatron model. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Martens, MA (reprint author), Fermi 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 0-7803-4376-X PY 1998 BP 72 EP 74 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800017 ER PT B AU Shafer, RE Blind, B Gray, ER Gilpatrick, JD Barlow, D Lawrence, GP AF Shafer, RE Blind, B Gray, ER Gilpatrick, JD Barlow, D Lawrence, GP BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Overview of the APT high-energy beam transport and beam expanders SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The APT high energy beam transport (HEBT) and beam expanders convey the 1700-MeV, 100-mA cw proton beam from the linac to the tritium target/blanket assembly, or a tuning beam stop. The HEBT includes extensive beam diagnostics, collimators, and beam jitter correction, to monitor and control the 170-MW beam prior to expansion. A zero-degree beamline conveys the beam to the beam stop, and an achromatic beand conveys the beam to the tritium production target. Nonlinear beam expanders make use of higher-order multipole magnets and dithering dipoles to expand the beam to a uniform-density, 16-cm wide by 160-cm high rectangular profile on the tritium-production target. The overall optics design will be reviewed, and beam simulations will be presented. C1 LANL, Los Alamos, NM 87545 USA. RP Shafer, RE (reprint author), LANL, MS H808,PO Box 1663, Los Alamos, NM 87545 USA. NR 1 TC 0 Z9 0 U1 0 U2 4 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 83 EP 85 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800021 ER PT B AU Gabriel, TA Barnes, JN Charlton, LA DiStefano, J Farrell, K Haines, J Johnson, JO Mansur, LK Pawel, SJ Siman-Tov, M Taleyarkhan, R McManamy, TJ Rennich, MJ AF Gabriel, TA Barnes, JN Charlton, LA DiStefano, J Farrell, K Haines, J Johnson, JO Mansur, LK Pawel, SJ Siman-Tov, M Taleyarkhan, R McManamy, TJ Rennich, MJ BE Comyn, M Craddock, MK Reiser, M Thomson, J TI The National Spallation Neutron Source target station: A general overview SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The technologies that are being utilized to design and build a state-of-the-art neutron spallation source, the National Spallation Neutron Source (NSNS), are discussed. Emphasis is given to the technology issues that present the greatest scientific challenges. The present facility configuration, ongoing analysis and the planned hardware research and development program are also described. C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA. RP Gabriel, TA (reprint author), Oak Ridge Natl Lab, POB 2008, Oak Ridge, TN 37831 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 0-7803-4376-X PY 1998 BP 86 EP 88 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800022 ER PT B AU Ahrens, L Alessi, J Blaskiewicz, M Bleser, E Brennan, JM Brown, K Gardner, C Glenn, JW Huang, H Reece, K Roser, T vanAsselt, W Zeno, K Zhang, SY AF Ahrens, L Alessi, J Blaskiewicz, M Bleser, E Brennan, JM Brown, K Gardner, C Glenn, JW Huang, H Reece, K Roser, T vanAsselt, W Zeno, K Zhang, SY BE Comyn, M Craddock, MK Reiser, M Thomson, J TI High intensity proton acceleration at the Brookhaven AGS - An update SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The AGS accelerator complex is into its third year of 60+ x10(12) (teraproton = Tp) per cycle operation. The hardware making up the complex as configured in 1997 is briefly mentioned. The present level of accelerator performance is discussed. This includes beam transfer efficiencies at each step in the acceleration process, i.e. losses; which are a serious issue at this intensity level. Progress made in understanding beam behavior at the Linac-to-Booster (LtB) injection, at the Booster-to-AGS (BtA) transfer as well as across the 450 ms AGS accumulation porch is presented. The state of transition crossing, with the gamma-tr jump is described. Coherent effects including those driven by space charge are important at all of these steps. C1 Brookhaven Natl Lab, AGS Dept, Upton, NY 11973 USA. RP Ahrens, L (reprint author), Brookhaven Natl Lab, AGS Dept, 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 0-7803-4376-X PY 1998 BP 89 EP 91 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800023 ER PT B AU Luccio, AU Katayama, T Wu, H AF Luccio, AU Katayama, T Wu, H BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Spin tracking in RHIC SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB In the acceleration of polarized protons in RHIC [1] many spin depolarizing resonances are encountered. Helical Siberian snakes [2] [3] will be used to overcome depolarizing effects. The behaviour of polarization can be studied by numerical tracking in a model accelerator, That allows one to check the strength of the resonances, to study the effect of snakes, to find safe lattice tune regions, and finally to study the operation of special devices like spin flippers. In this paper we describe numerical spin tracking. Results show that, for the design corrected distorted orbit and the design beam emittance, the polarization of the beam will be preserved in the whole range of proton energies in RHIC. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Luccio, AU (reprint author), Brookhaven Natl Lab, Upton, NY 11973 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 0-7803-4376-X PY 1998 BP 92 EP 94 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800024 ER PT B AU Peggs, S Harrison, M Pilat, F Syphers, M AF Peggs, S Harrison, M Pilat, F Syphers, M BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Flat beams in a 50 TeV hadron collider SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Peggs, S (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. 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 0-7803-4376-X PY 1998 BP 95 EP 97 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800025 ER PT B AU Pilat, F Trbojevic, D Ahrens, L Brown, K Connolly, R Dell, GF Fischer, W Kewisch, J MacKay, W Mane, V Peggs, S Satogata, T Tepikian, S Thompson, P Tsoupas, N Wei, J AF Pilat, F Trbojevic, D Ahrens, L Brown, K Connolly, R Dell, GF Fischer, W Kewisch, J MacKay, W Mane, V Peggs, S Satogata, T Tepikian, S Thompson, P Tsoupas, N Wei, J BE Comyn, M Craddock, MK Reiser, M Thomson, J TI RHIC Sextant Test: Accelerator systems and performance SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB One sextant of the RHIC Collider was commissioned in early 1997 with beam. We describe here the performance of the accelerator systems during the test, such as the mag-net and power supply systems, instrumentation subsystems and application software. We also describe a ramping test without beam that took place after the commissioning with beam. Finally, we analyze the implications of accelerator systems performance and their impact on the planning for RHIC installation and commissioning. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Pilat, F (reprint author), Brookhaven Natl Lab, Upton, NY 11973 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 0-7803-4376-X PY 1998 BP 98 EP 100 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800026 ER PT B AU Trbojevic, D Pilat, F Ahrens, L Barton, D Clifford, T Connoly, R Fischer, W Harrison, M MacKay, W Olsen, R Peggs, S Satogata, T Tepikian, S Thompson, P Trahern, CG Witkover, R AF Trbojevic, D Pilat, F Ahrens, L Barton, D Clifford, T Connoly, R Fischer, W Harrison, M MacKay, W Olsen, R Peggs, S Satogata, T Tepikian, S Thompson, P Trahern, CG Witkover, R BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Preparing accelerator systems for the RHIC Sextant commissioning SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The Relativistic Heavy Ion Collider (RHIC) construction is progressing steadily towards completion in 1999 when beams will circulate in both collider rings. One of the major tests of the RHIC project was the commissioning of the first sextant with gold ion beams in early 1997. This is a report on preparation of the RHIC accelerator systems for the first sextant test. It includes beam position monitors, timing, injection correction through the magnetic septum and kickers, current transformers, "flags" and the ionization beam profile monitors, beam loss monitors, beam and quench permit link system, power supply controls, and the configuration database system. The software and hardware development and coordination of the different systems before commissioning were regularly checked during bi-weekly, and (later) weekly, progress report meetings. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Trbojevic, D (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 0-7803-4376-X PY 1998 BP 101 EP 103 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800027 ER PT B AU Chou, W Ishimaru, H AF Chou, W Ishimaru, H BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Proposal for an aluminum beam screen in the LHC SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB This paper proposes a cold beam screen made of high strength, high electrical resistivity aluminum alloy (such as A7N01) as an alternative to the present LHC design that is based on a copper co-laminated high Mn content stainless steel. The main advantages of an aluminum screen are: simple manufacturing processes, low cost, elimination of millions of small slots and of TEM waves, no adhesion problem, no helium leak problem (vacuum tight), non-magnetic, and others. The available aperture is equivalent to the present design when a non-uniform wall thickness is adopted. A prototype was built to demonstrate the design and the end connections. Concerns about the multi-pactoring, electron cloud instability, surface resistance and cryopumping using anodized aluminum will be addressed. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Chou, W (reprint author), Fermi 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 0-7803-4376-X PY 1998 BP 110 EP 112 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800030 ER PT B AU Chou, W Ritson, D AF Chou, W Ritson, D BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Dynamic aperture studies during collisions in the LHC SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The dynamic aperture during collisions in the LHC is mainly determined by the beam-beam interactions and by multipole errors of the high gradient quadrupoles in the interaction regions. The computer code JJIP has been modified to accommodate the LHC lattice configuration and parameters and is employed in this study. Simulations over a range of machine parameters are carried out, and results of preliminary investigation are presented. C1 Fermilab, Batavia, IL 60510 USA. RP Chou, W (reprint author), Fermilab, POB 500, Batavia, IL 60510 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 0-7803-4376-X PY 1998 BP 113 EP 115 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800031 ER PT B AU Drozhdin, AI Mokhov, NV AF Drozhdin, AI Mokhov, NV BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Optimization of the LHC beam cleaning system with respect to beam loss in the high luminosity insertions SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The LHC design performance is achievable only with a dedicated beam cleaning system embedded in the lattice. The effect of the system on the beam loss distribution in the entire machine is studied with emphasis on the two high luminosity insertions. Realistic Monte-Carlo simulations are described, which include a model for beam halo interactions with collimators and other components, multi-turn particle tracking in the lattice, hadronic and electromagnetic shower simulations, and thermal and stress analyses. Methods to mitigate beam-induced effects in the interaction regions at operational and accidental beam loss are proposed, both for injection and collision conditions. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Drozhdin, AI (reprint author), Fermi Natl Accelerator Lab, POB 500, Batavia, IL 60510 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 0-7803-4376-X PY 1998 BP 116 EP 118 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800032 ER PT B AU Johnstone, CJ AF Johnstone, CJ BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Local chromaticity correction of the LHC SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Local chromaticity correction of a low-beta region can under certain conditions enhance the momentum acceptance of a circular accelerator [1]. For this paper a local chromaticity scheme was explored for the LHC employing chromatic correction sextupoles in the are cells nearest the final-focus triplet. Initially, existing optics and current sextupole locations [2] were used to correct the natural chromaticity of the LHC Interaction Region (IR) and preliminary tracking indicated an increase in dynamic aperture. However, calculated sextupole strengths were unrealistic. Therefore, work on a specialized chromatic correction region with increased beta functions at specific sextupole locations has begun. The higher beta functions allow the strengths required for the sextupoles to be reduced and, also, more optimal sextupole phase advances for chromatic correction. Progress towards an optical model for local chromatic correction for the LHC IR is the subject of this paper. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Johnstone, CJ (reprint author), Fermi Natl Accelerator Lab, POB 500, Batavia, IL 60510 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 0-7803-4376-X PY 1998 BP 119 EP 120 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800033 ER PT B AU Meot, F AF Meot, F BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Perturbation of the periodic dispersion under beam crossing optics in LHC SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Beam crossing and separation schemes in the LHC interaction regions impose non-zero closed orbit in the low-beta triplets. The related perturbative dispersion is derived; propagation, multi-crossing interference, perturbative effects around the ring are investigated and quantified. Horizontal and vertical compensation schemes are presented. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Meot, F (reprint author), Fermi Natl Accelerator Lab, POB 500, Batavia, IL 60510 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 0-7803-4376-X PY 1998 BP 121 EP 123 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800034 ER PT B AU Mokhov, NV Strait, JB AF Mokhov, NV Strait, JB BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Towards the optimal lhc interaction region: Beam-induced energy deposition SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The overall machine and detector performances at the LHC are strongly dependent on the interaction region (IR) scheme and details. Beam-induced energy deposition in the components of the complex due to both p-p collisions and beam loss in the IR vicinity is a significant challenge for the design of the high luminosity insertions. It was shown in our previous studies that a set of collimators in the machine and absorbers within the low-beta quadrupoles would reduce both the peak power density and total heat load to tolerable levels with a reasonable safety margin. New optical configurations for the IRs developed in the past year may require changes in the absorber dimensions. In this paper we present studies of the radial and azimuthal distributions of the deposited power density and the dependence of peak power density on absorber thickness. These can be used to guide further studies of the optics and absorber systems. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Mokhov, NV (reprint author), Fermi 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 0-7803-4376-X PY 1998 BP 124 EP 126 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800035 ER PT B AU Assadi, S Colestock, PL AF Assadi, S Colestock, PL BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Measurement and analysis of longitudinal bunched beam echoes in the Fermilab Tevatron SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Bunched beam echoes have been generated in the Fermilab Tevatron using a simple impulse kick technique involving the rf system. The echoes occur as a result of the nonlinear mixing of quadrupole and dipole components of successive impulse kicks, and may be readily observed using a bunch phase measurement system. The echo contains information on the synchrotron tune spread, as well as on various nonlinear phenomena, including the nonlinear tune spread and the effects of noise on the incoherent synchrotron motion. By measuring the detailed form of the echo response as well as its overall envelope as a function of the echo delay time, it is possible, in principle, to extract some of this information. In this paper we present experimental results along with a perturbation model which includes the effects of a nonlinear tune spread. In particular, we wish to explain the observed rapid decay of the echo envelope in terms of relevant beam parameters. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Assadi, S (reprint author), Fermi 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 0-7803-4376-X PY 1998 BP 127 EP 129 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800036 ER PT B AU Chou, W AF Chou, W BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Accelerator physics issues of a Very Large Hadron Collider SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A Very Large Hadron Collider (VLHC) was proposed for the post-LHC future.[1] This paper gives a quick survey of a number of accelerator physics issues based on the information obtained from a parameter spreadsheet SSP.[2] The main technical challenges to build such a machine appear to be: the large number of events per crossing (in hundreds), enormous beam stored energy (equivalent to tens tons of TNT), ground motion (which is particularly harmful when the synchrotron frequency is in the sub-Hertz range), small dynamic aperture (due to long filling time), fast growth of the resistive wall instability (in a fraction of one turn), low threshold of the single bunch transverse instability (due to big machine size), strong synchrotron radiation (at a level close to the LEP) and short radiation damage lifetime, etc. Possible solutions to some of these problems will also be discussed. C1 Fermilab, Batavia, IL 60510 USA. RP Chou, W (reprint author), Fermilab, 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 0-7803-4376-X PY 1998 BP 130 EP 132 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800037 ER PT B AU Drozhdin, AI Mokhov, NV AF Drozhdin, AI Mokhov, NV BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Beam loss handling at Tevatron: Simulations and implementations SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Summ. of studies is presented towards minimization of beam loss in the critical locations at the Fermilab Tevatron to reduce background rates in the collider detectors and to protect machine components. Based on detailed Monte-Carlo simulations, measures have been proposed and incorporated in the machine to reduce accelerator-related instantaneous and residual background levels in the DO and CDF detectors. Recent measurements are in good agreement with the predictions. A re-alignment of the electro-static deflector and the Lambertson magnet and the addition of shielding in the AO straight section has resulted in reduction of beam induced energy deposition in the superconducting magnets, which allowed an increase in the extracted beam intensity. Using the same simulation technique, it has been calculated that the total beam of 10(13) protons can be removed from the Tevatron at the end of the store, leaving the antiproton beam in the machine for recycling. Using the EO collimator with attached scattering targets, this process will require about 100 seconds to keep the power deposition in the superconducting magnets below the quench level. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Drozhdin, AI (reprint author), Fermi Natl Accelerator Lab, POB 500, Batavia, IL 60510 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 0-7803-4376-X PY 1998 BP 133 EP 135 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800038 ER PT B AU Martens, MA AF Martens, MA BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Using luminosity distributions to determine luminosity in a collider with a coupled lattice SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The traditional method for calculating luminosity in the Fermilab Tevatron during collider operations assumes a knowledge of the machine lattice at the locations of the flying wires and the luminous regions. In this paper we investigate an alternative method of determining the luminosity which does not require a knowledge of the lattice functions and can be applied even in the case of a transversely coupled lattice. By measuring a set of longitudinal luminosity distributions each with a different intentionally added separation between the proton and antiproton closed orbits the transverse widths of the luminous region can be determined and used to calculate the luminosity. As an example we apply this method to a set of Monte Carlo generated luminosity distributions using a Tevatron lattice that is transversely coupled due to a roll in one of the low beta quadrupole magnets. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Martens, MA (reprint author), Fermi Natl Accelerator Lab, POB 500, Batavia, IL 60510 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 0-7803-4376-X PY 1998 BP 136 EP 138 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800039 ER PT B AU Martin, PS Mishra, CS AF Martin, PS Mishra, CS BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Excitation characteristics of Fermilab Main Injector dipoles and magnet assignment to reduce closed orbit errors SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The Fermilab Main Injector project is building 344 dipoles, produced from steel with varying magnetic properties. The strategies for assigning dipoles, based upon their strength characteristics, are discussed. The closed orbit errors due to the strength variations are expected to be small in comparison to alignment errors. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Martin, PS (reprint author), Fermi 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 0-7803-4376-X PY 1998 BP 139 EP 140 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800040 ER PT B AU Moore, CD AF Moore, CD BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Status of the Fermilab fixed target program SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Fermilab is in the midst of an 800 GeV fixed target run involving ten external beam lines and the operation of the pbar source for two additional experiments. Details of the preparation are presented with an emphasis on how changes from the last run have impacted the current run. Statistics and graphical representations show the progress toward meeting the goals of the program. An overview is presented of the external (floods....) and internal (machine instabilities ...) challenges encountered during the run. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Moore, CD (reprint author), Fermi 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 0-7803-4376-X PY 1998 BP 141 EP 143 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800041 ER PT B AU Shukla, S Ankenbrandt, C Capista, D Kourbanis, I Marriner, J McGinnis, D Steimel, J Tomlin, R AF Shukla, S Ankenbrandt, C Capista, D Kourbanis, I Marriner, J McGinnis, D Steimel, J Tomlin, R BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Slip stacking for the Fermilab luminosity upgrade SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Increasing the proton intensity available for antiproton production is part of a plan for increasing the luminosity in the Fermilab Tevatron in the near future. We intend to increase the proton intensity using a kind of momentum stacking in the Main Injector called Slip Stacking [1]. We report the status of the effort towards its implementation. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Shukla, S (reprint author), Fermi Natl Accelerator Lab, POB 500, Batavia, IL 60510 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 0-7803-4376-X PY 1998 BP 144 EP 146 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800042 ER PT B AU Tartaglia, MA AF Tartaglia, MA BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Experiments with separated beams in Run I at the Tevatron collider SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB During the Tevatron collider Run I, a great deal of effort was spent understanding the luminosity at the two colliding detectors. In collaboration with the Tevatron operations group, the DZero experiment recorded data while the colliding beams were intentionally separated by several beam widths in the horizontal and vertical planes. The resulting luminosity profiles contain a great deal of information about the lattice and beam size parameters at the low-beta focus, which can be extracted by fitting in a variety of ways. This paper will review details of these separated beam measurements and present results on Tevatron lattice parameter and luminosity determination. C1 Fermi Natl Accelerator Lab, DZero Collaborat, Batavia, IL 60510 USA. RP Tartaglia, MA (reprint author), Fermi Natl Accelerator Lab, DZero Collaborat, 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 0-7803-4376-X PY 1998 BP 147 EP 149 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800043 ER PT B AU Feinberg, B Belkacem, A Claytor, N Dinneen, T Gould, H AF Feinberg, B Belkacem, A Claytor, N Dinneen, T Gould, H BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Capture from pair production as a beam loss mechanism for heavy ions at RHIC SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res ID ELECTRON-CAPTURE; COLLISIONS AB Electron capture from electron-positron pair production is predicted to be a major source of beam loss for the heaviest ions at RHIC. Achieving the highest luminosity thus requires an understanding of the capture process. We report measurements of this process at Brookhaven National Laboratory's AGS using 10.8 GeV/nucleon Au79+ projectiles on Au targets. Capture from pair production is a process in which the very high electromagnetic field involved in the collision of two relativistic heavy ions results in the production of an electron-positron pair with the capture of the electron by one of the ions. There are many theoretical papers published on capture from pair production with discrepancies between predicted cross sections. The experimental results are compared to theory and to previous experiments at 1 GeV/nucleon. The implications of extrapolations to RHIC energies are presented. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Feinberg, B (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, 1 Cyclotron Rd, Berkeley, CA 94720 USA. NR 11 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 150 EP 152 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800044 ER PT B AU Dooling, JC Brumwell, FR McMichael, GE AF Dooling, JC Brumwell, FR McMichael, GE BE Comyn, M Craddock, MK Reiser, M Thomson, J TI The IPNS accelerator 50 MeV and 500 MeV transport lines SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The Intense Pulsed Neutron Source (IPNS) accelerator delivers up to 500 MeV protons to a depleted uranium target producing spallation neutrons for material science and other research. A 70-80 ns bunch strikes the target at a rate of 30 Hz with an average beam current of 15 mu A. The 50 MeV and 500 MeV beam lines transport protons from the Drift Tube Linac (DTL) to the Rapid Cycling Synchrotron (RCS) and from the RCS to the Neutron Generating Source (NGS) target, respectively. Through over 15 years of operation, the accelerator has been highly reliable with the 5 billionth pulse on target recorded March 12, 1997. During this time, IPNS operators have discovered tunes for various parts of the DTL/RCS accelerator allowing for continual improvement in average current delivered to the target; however, in numerous cases this has been achieved by moving significantly away from the original design parameters. A new attempt is being made to analyze the lines and develop computer models that can be used to alleviate some of the undesirable features of the present "best tune." In the 500 MeV line, higher order elements will be included in the modeling with the goal of providing a uniform power density profile at the NGS target. This paper describes features of the present lines, and progress-to-date in analyzing and improving them. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Dooling, JC (reprint author), Argonne Natl Lab, 9700 S Cass Ave,Bld 360, Argonne, IL 60439 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 0-7803-4376-X PY 1998 BP 156 EP 158 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800046 ER PT B AU Blumberg, LN Lee, YY AF Blumberg, LN Lee, YY BE Comyn, M Craddock, MK Reiser, M Thomson, J TI H- charge exchange injection for the NSNS accumulator SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A scheme for injection into the FODO cell of the National Spallation Neutron Source(NSNS) Accumulator ring is discussed. A 400 mu g/cm(2) carbon foil is chosen for a high stripping efficiency and for heating of the foil consideration. Additional schemes to reduce losses due to nuclear and Coulomb scattering at the foil are discussed. Subsequent loss from magnetic field ionization of the residual H degrees component is estimated to be small comparable to nuclear loss. A method for sweeping and collecting the stripped electrons from the foil is presented. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Blumberg, LN (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 0-7803-4376-X PY 1998 BP 159 EP 161 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800047 ER PT B AU Raparia, D Alessi, J Lee, YY Weng, WT AF Raparia, D Alessi, J Lee, YY Weng, WT BE Comyn, M Craddock, MK Reiser, M Thomson, J TI The NSNS high energy beam transport line SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB In the National Spallation Neutron Source (NSNS) design, a 180 meter long transport line connects the 1 GeV linac to an accumulator ring. The linac beam has a current of 28 mA, pulse length of 1 ms, and 60 Hz rep rate. The high energy transport line consists of sixteen 60 degrees FODO cells, and accommodates a 90 degrees achromatic bend, an energy compressor, collimators, part of the injection system, and enough diagnostic devices to measure the beam quality before injection. To reduce the uncontrolled beam losses, this line has nine beam halo scrapers and very tight tolerances on both transverse and longitudinal beam dynamics under space charge conditions. The design of this line is presented. C1 Brookhaven Natl Lab, AGS Dept, Upton, NY 11973 USA. RP Raparia, D (reprint author), Brookhaven Natl Lab, AGS Dept, 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 0-7803-4376-X PY 1998 BP 162 EP 164 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800048 ER PT B AU Borden, MJ Plum, MA Sugai, I AF Borden, MJ Plum, MA Sugai, I BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Carbon stripper foils used in the Los Alamos PSR SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Carbon stripper foils produced by the modified controlled ACDC are discharge method (mCADAD) at the Institute for Nuclear Study have been tested and used for high current 800-MeV beam production in the Proton Storage Ring (PSR) since 1993. Two foils approximately 110 mu g/cm(2) each are sandwiched together to produce an equivalent 220 mu g/cm(2) foil. The foil sandwich is supported by 4-5 mu m diameter carbon fibers attached to an aluminum frame. These foils have survived as long as five months during PSR normal beam production of near 70 mu A average current on target. Typical life-times of other foils vary from seven to fourteen days with lower on-target average current. Beam loss data also indicate that these foils have slower shrinkage rates than standard foils. Equipment has been assembled and used to produce foils by the mCADAD method at Los Alamos. These foils will be tested during 1997 operation. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Borden, MJ (reprint author), Univ Calif Los Alamos Natl Lab, MS H838, Los Alamos, NM 87545 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 0-7803-4376-X PY 1998 BP 187 EP 189 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800057 ER PT B AU Donahue, JB Baker, GD Bultman, NK Brun, TO Ferguson, PD Macek, RJ Njegomir, MM Plum, MA Roberts, JE Russell, GJ Sommer, WF AF Donahue, JB Baker, GD Bultman, NK Brun, TO Ferguson, PD Macek, RJ Njegomir, MM Plum, MA Roberts, JE Russell, GJ Sommer, WF BE Comyn, M Craddock, MK Reiser, M Thomson, J TI LANSCE short-pulse spallation source target upgrade SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A project to upgrade the short-pulse spallation source target at the Los Alamos Neutron Scattering Center (LANSCE) is in progress. This upgrade will reduce the target change out time from about a year to about three weeks and permit the proton beam current to be raised to 200 mu A. The project includes a new target-moderator-reflector system, a new suite of moderators for four new flight paths, improved auxiliary systems, remote handling capability, and a new crane and service building. The project has also supported calculations and experiments for target neutronics, rod-target thermo-hydraulics, and corrosion-related measurements in a proton beam. The final engineering design is now complete and the project has begun fabrication and procurement. Installation will begin in the fall of this year. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Donahue, JB (reprint author), Univ Calif Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA. OI Ferguson, Phillip/0000-0002-7661-4223 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 0-7803-4376-X PY 1998 BP 190 EP 192 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800058 ER PT B AU Rose, CR Barlow, DB Blind, B Neri, F Power, JF Walstrom, PL AF Rose, CR Barlow, DB Blind, B Neri, F Power, JF Walstrom, PL BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Overview of the bump-magnet system at the LANSCE Proton Storage ring SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB An upgrade program for increasing the stored beam current in the Proton Storage is presently under way. A part of the upgrade is the design and installation of a four-magnet beam-bumping system used for phase-space painting and minimizing interaction of the stored beam with the injection stripper foil. This paper describes the bump-magnet system including the relevant beam requirements, magnet specifications, power-cable specifications, pulsed-modulator requirements, and beam-tube eddy-current effects. The magnets are ferrite window-frame magnets with saddle windings. The series-pass pulsed modulators are programmable both in rise and fall time as well as amplitude. The peak current can be varied between 50 and 300 A. The pulsed-current rise-time is fixed at 1 ms, and the linear fall-time during which beam is injected into the ring can be varied between 0.5 and 1.5 ms. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Rose, CR (reprint author), Univ Calif 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 0-7803-4376-X PY 1998 BP 193 EP 194 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800059 ER PT B AU Tsoupas, N Roser, T Syphers, M Luccio, A AF Tsoupas, N Roser, T Syphers, M Luccio, A BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Transfer of a polarized proton beam from AGS to RHIC SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB As part of the RHIC project, the RHIC machine will also be able to accelerate polarized proton beam bunches. The bunches will be extracted from the AGS machine, with kinetic energy T=25 GeV, and transfered into RHIC via the AtR transfer line[1]. When the RHIC machine accelerates polarized protons, it will operate with two full snakes, which define the stable spin direction of a polarized proton beam circulating in each ring, along the vertical. Therefore a polarized proton beam should be injected into the RHIC machine with the stable spin direction along the vertical in order to match that of the RHIC machine. The layout of the dipole magnets of the AtR line[1] creates a dependance, on the injection energy, of the stable spin direction of a polarized proton beam injected into the RHIC machine. In this paper, the study of the stable spin direction (at the RHIC injection point) of a polarized proton beam as a function of the injection energy is presented. A modification of the AtR transfer line, which eliminates this energy dependance (within the range of proton injection energies) of the stable spin direction is also presented. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Tsoupas, N (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 0-7803-4376-X PY 1998 BP 207 EP 209 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800064 ER PT B AU Fischer, W Hahn, H MacKay, WW Satogata, T Tsoupas, N Zhang, W AF Fischer, W Hahn, H MacKay, WW Satogata, T Tsoupas, N Zhang, W BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Beam injection into RHIC SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB During the RHIC sextant test in January 1997 beam was injected into a sixth of one of the rings for the first time. We describe the injection zone and its bottlenecks. We report on the commissioning of the injection system, on beam based measurements of the kickers and the application program to steer the beam. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Fischer, W (reprint author), Brookhaven Natl Lab, Upton, NY 11973 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 0-7803-4376-X PY 1998 BP 210 EP 212 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800065 ER PT B AU Hahn, H Tsoupas, N Tuozzolo, JE AF Hahn, H Tsoupas, N Tuozzolo, JE BE Comyn, M Craddock, MK Reiser, M Thomson, J TI The RHIC injection kicker SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Beam transfer from the AGS to RHIC is performed in single-bunch mode. Close spacing of the bunches in the collider requires an injection kicker with a rise time of <90 nsec, suggesting adoption of a travelling wave structure. The required vertical kick of 0.186 T.m is provided by 4 magnets, each 1.12 m long with a 48.4 x 48.4 mm aperture and operated at 1.6 kA. The kicker is constructed as a "C" cross section magnet, in which ferrite and high-permittivity dielectric sections alternate. The dielectric blocks provide the capacity necessary for the nominally 25 Omega characteristic impedance of the travelling wave structure, but impose the practical limit on the peak voltage, and thus current, achievable. Computer studies to minimize local electric field enhancements resulted in a configuration capable of holding similar to 50 kV, with adequate safety margin over the nominal 40 kV. Equivalent circuit analysis indicated the possibility of lowering the nominal voltage by operating mismatched into 20 Omega terminations without degrading the pulse shape. In this paper, the experience gained in the fabrication of the production units and the results from various single-unit tests and operation of four kickers with beam in the "Sextant Test" are reported. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Hahn, H (reprint author), Brookhaven Natl Lab, Upton, NY 11973 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 0-7803-4376-X PY 1998 BP 213 EP 215 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800066 ER PT B AU Hahn, H Ratti, A AF Hahn, H Ratti, A BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Equivalent circuit analysis of the RHIC injection kicker SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The RHIC injection kicker is built as a travelling wave structure in order to assure the required 95 nsec risetime in the deflection strength. The kicker is constructed from 14 cells, each 7.5 cm long, with alternating ferrite and high-permittivity dielectric sections. The cell structure permits an analysis of the electrical properties of the kicker using lumped L, C, and R circuit elements. Their values are obtained directly from impedance measurements of the full-length kicker, the inductance and shunt capacitance values by measuring the input impedance at 1 MHz with the output shorted and open, respectively. A lossy series resonance circuit in each cell is found to reproduce the measured input impedance of the terminated kicker up to similar to 100 MHz. The validity of the equivalent circuit was confirmed by comparing the measured output current pulse shape time with that computed by the P-Spice program. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Hahn, H (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 0-7803-4376-X PY 1998 BP 216 EP 218 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800067 ER PT B AU Trbojevic, D Stevens, AJ Harrison, MA Dell, F Peggs, S AF Trbojevic, D Stevens, AJ Harrison, MA Dell, F Peggs, S BE Comyn, M Craddock, MK Reiser, M Thomson, J TI A study of betatron and momentum collimators in RHIC SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The Relativistic Heavy Ion Collider (RHIC) has two interaction regions where beta*=1-2m, with large detectors PHENIX and STAR. The transverse and longitudinal emittances are expected to double in size between one to two hours due to intra-beam scattering which may lead to transverse beam loss. Primary betatron collimators are positioned in the ring to allow efficient removal of particles with large betatron amplitudes. We have investigated distributions and losses coming from the out-scattered particles from the primary collimators, as well as the best positions for the secondary momentum and betatron collimators. 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 0-7803-4376-X PY 1998 BP 219 EP 221 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800068 ER PT B AU Tsoupas, N Fischer, W Kewisch, J MacKay, WW Peggs, S Pilat, F Tepikian, S Wei, J AF Tsoupas, N Fischer, W Kewisch, J MacKay, WW Peggs, S Pilat, F Tepikian, S Wei, J BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Focusing and matching properties of the AtR transfer line SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The AGS to RHIC (AtR) beam transfer line[1] has been constructed and will be used to transfer beam bunches from the AGS machine into the RHIC machine which is presently under construction at BNL. The original design of the AtR line[1] has been modified. This article will present the optics of the various sections of the existing AtR beam line, as well as the matching capabilities of the AtR line to the RHIC machine. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Tsoupas, N (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 0-7803-4376-X PY 1998 BP 222 EP 224 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800069 ER PT B AU Bieniosek, FM Kurnaev, O Cherepakhin, A Dinkel, J AF Bieniosek, FM Kurnaev, O Cherepakhin, A Dinkel, J BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Development of a beam sweeping system for the Fermilab antiproton source target SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Intensity of the incident 120-GeV proton beam on the antiproton production target is scheduled to increase to 5x10(12) protons per pulse. To prevent damage to the target, we plan to spread the hot spot on target with a beam sweeping system. Now under development are rotating-field magnets for installation upstream and downstream of the target. These magnets will deflect the beam in a circular pattern on the target. Peak current of 7 kA and peak voltage drop of 6 kV are expected. The power supply, which is separated from the magnet by a distance of about 10m, utilizes magnetic pulse compression by saturating inductors to drive the magnets through the long transmission lines. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Bieniosek, FM (reprint author), Fermi 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 0-7803-4376-X PY 1998 BP 234 EP 236 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800073 ER PT B AU Johnstone, JA AF Johnstone, JA BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Optics and field error compensation in the FNAL permanent magnet 8.9 GeV/c proton transfer line SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Protons are transported 760 m from the Booster extraction point to injection into the Fermilab Main Injector. Apart from two, comparatively short, specialized optical matching sections the transfer lattice is described by 90 degrees betatron phase advance are cells and missing-dipole dispersion suppressing cells. This repetative structure, combined with the small average bend per cell makes it feasible to construct this section exclusively from low-field permanent dipoles and gradient magnets. The permanent magnet section is nearly devoid of powered correctors: trajectory control and momentum error compensation is accomplished instead by moving select gradient magnets transversely. Permanent magnets are being used in the transfer line primarily to acquire the manufacturing and operational experience necessary to ensure success of the future FNAL Recycler Ring. C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Johnstone, JA (reprint author), Fermi 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 0-7803-4376-X PY 1998 BP 240 EP 242 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800075 ER PT B AU Reichanadter, M Bhat, CM Crawford, C Martin, PS AF Reichanadter, M Bhat, CM Crawford, C Martin, PS BE Comyn, M Craddock, MK Reiser, M Thomson, J TI A high intensity beam absorber corebox for the Fermilab main injector abort system SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Reichanadter, M (reprint author), Fermi 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 0-7803-4376-X PY 1998 BP 243 EP 245 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800076 ER PT B AU Blind, B Jason, AJ AF Blind, B Jason, AJ BE Comyn, M Craddock, MK Reiser, M Thomson, J TI PSR injection-line upgrade SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB We describe the new injection line to be implemented for the Los Alamos Proton Storage Ring (PSR) in the change from a two-step injection process to direct H- injection. While obeying all geometrical constraints imposed by the existing structures, the new line has properties not found in the present injection line. In particular, it features decoupled transverse phase spaces downstream of the skew bend and a high degree of tunability of the beam at the injection foil. A comprehensive set of error studies has dictated the imposed component tolerances and has indicated the expected performance of the system. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA. RP Blind, B (reprint author), Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 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 0-7803-4376-X PY 1998 BP 270 EP 272 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800085 ER PT B AU Thiessen, HA Neri, F Rust, K Redd, DB AF Thiessen, HA Neri, F Rust, K Redd, DB BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Multi-pulse extraction from Los Alamos Proton Storage Ring for radiographic applications SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB In proton Radiography, one of the goals is a motion picture of a rapidly moving object. The Los Alamos proton Storage Ring (PSR) in its normal operating mode, delivers a single pulse approximately 120 ns wide (fwhm). In development runs at the PSR, we successfully demonstrated operation of a technique to deliver two pulses, each 40 nsec wide, with adjustable spacing. C1 Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87544 USA. RP Thiessen, HA (reprint author), Univ Calif Los Alamos Natl Lab, 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 0-7803-4376-X PY 1998 BP 273 EP 275 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800086 ER PT B AU Hutton, A AF Hutton, A BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Operation of CEBAF with heavy beamloading SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB CEBAF is a 4 GeV, 200 mu A five-pass recirculating superconducting electron accelerator that has been operating for nuclear physics research at full energy since November 95. The beam current has been increased to over 180 mu A at 4 GeV with the maximum current in the linac over 900 mu A The superconducting cavities operate in a regime where the beam-induced voltage is comparable to the accelerating gradient. The operational limits and the issues required to maintain stable operation of the 1497 MHz superconducting cavities will be discussed, together with the implications for the other accelerator systems. There are three experimental Halls which can run simultaneously with three interleaved 499 MHz bunch trains and RF separators. Operation with simultaneous beams to two Halls is now routine, and simultaneous three beam operation has been demonstrated. The maximum design current per bunch train (120 mu A) has been achieved. Hall B eventually requires beam currents as low as 1 nA (200 pA has been delivered) simultaneous with delivery of up to 200 mu A to the other Halls. The required beam current ratio of 10,000 has been achieved; development of 1 nA beam position monitors continues. C1 Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA. RP Hutton, A (reprint author), Thomas Jefferson Natl Accelerator Facil, 12000 Jefferson Ave, Newport News, VA 23606 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 0-7803-4376-X PY 1998 BP 281 EP 285 PG 5 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800089 ER PT B AU Palmer, RB AF Palmer, RB BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Progress on mu(+)mu(-) colliders SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Advantages and disadvantages of muon colliders are discussed. Recent results of calculations of the radiation hazard from muon decay neutrinos are presented. This is a significant problem for machines with center of mass energy of 4 TeV, but of no consequence for lower energies. Plans are outlined for future theoretical and experimental studies. Besides continued work on the parameters of a 4 TeV collider, studies are now starting on a machine near 100 GeV that could be a factory for the s-channel production of Higgs particles. Proposals are also presented for a demonstration of ionization cooling and of the required targeting, pion capture, and phase rotation rf. C1 Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. RP Palmer, RB (reprint author), Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. 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 0-7803-4376-X PY 1998 BP 286 EP 290 PG 5 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800090 ER PT B AU Sullivan, M AF Sullivan, M BE Comyn, M Craddock, MK Reiser, M Thomson, J TI B-factory interaction region design SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB High luminosity B-factories are generally high current (1-3 A) e+e- storage ring accelerators that operate at a center-of-mass energy equal to the mass of the Upsilon (4S) resonance (10.58 GeV). The high beam currents are achieved by storing a large number of bunches (several hundred to several thousand) into each beam. Two designs, the ones located at SLAG and KEK, also have asymmetric beam energies. This imparts a boost to the nearly stationary B mesons formed from the decay of the 4S resonance and allows precision vertex tracking detectors to look for a difference between the decay profiles of the matter and anti-matter B mesons, thereby observing a violation of CP. Bringing the stored beams into collision is one of the major challenges of any B-factory design. In order to achieve high luminosity the beams must be tightly focused. This pushes the final focusing elements close enough to the interaction point to be inside the solenoidal field of the physics detector. In addition, beam-related detector backgrounds from synchrotron radiation and scattered beam particles must be kept below an acceptable level. The major B-factory designs at Cornell University, KEK, and SLAG have all addressed these problems in various ways that depend on specific accelerator design decisions. This paper discusses the accelerator parameters and detector constraints that influence an interaction region (IR) design, as well as how the various IR designs address the challenges posed by a high luminosity B-factory. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94039 USA. RP Sullivan, M (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94039 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 0-7803-4376-X PY 1998 BP 296 EP 300 PG 5 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800092 ER PT B AU Wienands, U Reuter, E Bellomo, P Fisher, A Gracia, J Gray, R Pietryka, M Taylor, T Bharadwaj, V Iverson, R Kulikov, A Seeman, JT Turner, J Belser, C Zisman, M Zholents, S AF Wienands, U Reuter, E Bellomo, P Fisher, A Gracia, J Gray, R Pietryka, M Taylor, T Bharadwaj, V Iverson, R Kulikov, A Seeman, JT Turner, J Belser, C Zisman, M Zholents, S BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Status and early commissioning of the PEP-II high energy ring SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The High Energy Ring of the PEP-II B-Factory has been constructed in the PEP tunnel. It is now beginning beam commissioning. This report will address the status of the ring systems and our experience in commissioning the systems as well as the first beam running. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Wienands, U (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 0-7803-4376-X PY 1998 BP 315 EP 317 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800097 ER PT B AU Biedron, SG Milton, SV AF Biedron, SG Milton, SV BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Automated tuning of the Advanced Photon Source booster synchrotron SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The acceleration cycle of the Advanced Photon Source (APS) booster synchrotron is completed within 223 ms and is repeated at 2 Hz. Unless properly corrected, transverse and longitudinal injection errors can lead to inefficient booster performance. In order to simplify daily operation, automated tuning methods have been developed. Through the use of beam position monitor (BPM) readings, transfer line corrector magnets, magnet ramp timing, and empirically determined response functions, the injection process is optimized by correcting the first turn trajectory to the measured closed orbit. These tuning algorithms and their implementation are described here along with an evaluation of their performance. C1 Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. RP Biedron, SG (reprint author), Argonne Natl Lab, Adv Photon Source, 9700 S Cass Ave, Argonne, IL 60439 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 0-7803-4376-X PY 1998 BP 324 EP 326 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800100 ER PT B AU Lessner, E White, M AF Lessner, E White, M BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Concepts for a slow-positron target at the Advanced Photon Source SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The Advanced Photon Source (APS) [1,2] linear accelerator beam could be used to produce slow positrons during the hours between the storage ring injection cycles. Initial concepts for the design of a target that is optimized for slow-positron production are discussed, and simulation results are presented. Some possible ways to increase the nominal linac beam power for improved slow-positron production are also discussed. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. EM lessner@aps.anl.gov; mwhite@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 0-7803-4376-X PY 1998 BP 327 EP 329 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800101 ER PT B AU Whittum, DH Henke, H AF Whittum, DH Henke, H BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Transverse kick in misaligned traveling wave structures driven at the fundamental mode SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Fabrication errors in traveling wave structures result in non-axissymmetric RF fields that couple to the rf drive at the fundamental mode frequency. We calculate the excitation of the dipole mode and the integrated effect on the beam, using the thin iris and small hole approximation. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Whittum, DH (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 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 0-7803-4376-X PY 1998 BP 351 EP 353 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800109 ER PT B AU Minty, MG Kubo, K Hinode, F Sakanaka, S Urakawa, J AF Minty, MG Kubo, K Hinode, F Sakanaka, S Urakawa, J BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Low-level rf system design for the accelerator test facility (ATF) damping ring SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The ATF damping ring[1] was built to demonstrate the production of low emittance, high current beams for future linear colliders. To attain high beam currents, multiple high current bunch trains are required. The low-level rf system should be designed to minimize both steady-state and transient beam loading effects in the accelerating cavities. In addition the design should be sufficiently flexible to allow for a variety of beam dynamics tests which require a wide range of beam currents and cavity voltages. The low-level rf system and stability boundaries for reduced power and full power operation are discussed in this paper. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Minty, MG (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 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 0-7803-4376-X PY 1998 BP 354 EP 356 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800110 ER PT B AU Minty, MG AF Minty, MG BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Low-level rf system design for the next linear collider damping rings SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The design current for the Next Linear Collider (NLC) damping rings is an order of magnitude higher than existing damping rings. As opposed to storage rings, damping rings are required to operate at a high repetition frequency. Transient beam loading is therefore particularly severe. The NLC design[1] calls for a full current fill pattern consisting of up to 4 trains of 90 bunches for a total de current of 1.2 A. However, using conventional filling techniques, with a rapid current ramp the ring energy acceptance could decrease due to transient loading and the beam might not be captured. In this paper we describe two features of the low-level rf system design. The first avoids any reduction of duty cycle while the second ensures beam capture and regulation of the cavity voltages and beam phase. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Minty, MG (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 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 0-7803-4376-X PY 1998 BP 357 EP 359 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800111 ER PT B AU Wang, CX Irwin, J AF Wang, CX Irwin, J BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Centroid and emittance of a kicked beam in rings SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB We generalize the existing decoherence theory of a kicked beam to linearly uncoupled 4D transverse phase space. Analytical results for the beam centroid motion as well as beam emittance (i.e., Ist and 2nd order beam moments) are given. We formulate the problem in the language of one-turn map and normal form theory in order to emphasize the approximations used and facilitate further generalizations. We will not discuss the chromaticity decoherence factor, which can be found in the references. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94025 USA. RP Wang, CX (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, 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 0-7803-4376-X PY 1998 BP 360 EP 362 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800112 ER PT B AU Norem, J Jagger, J Sharma, S Keil, E Foster, GW Malamud, E Chojnacki, E Winn, D AF Norem, J Jagger, J Sharma, S Keil, E Foster, GW Malamud, E Chojnacki, E Winn, D BE Comyn, M Craddock, MK Reiser, M Thomson, J TI An e(+)e(-) top factory in a 50+50 TeV hadron collider tunnel SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB We present the parameters of an e+e- collider sized for the tunnel of a 50 + 50 TeV superferric hadron collider[1]. Assuming a diameter of 170 lan and a maximum radiated power of 100 MW, this collider should have a maximum energy of 500 - 600 GeV (c.m.) and should be able to produce a luminosity L = 0.9.1033 cm-2sec-1 at a center of mass energy of 360 GeV, (somewhat less at higher or lower energies) which would make it useful for producing top quarks or light Higgs bosons. Design problems include the very low field magnets, synchrotron radiation power, beam stability, and heat removal systems. Preliminary magnet, vacuum chamber and cooling designs are presented along with possible construction techniques, and some costing algorithms. We also consider an ep collider with 70 GeV electrons and 5 TeV protons as an injector. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Norem, J (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 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 0-7803-4376-X PY 1998 BP 363 EP 365 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800113 ER PT B AU Lin, X Ng, CK Ko, K AF Lin, X Ng, CK Ko, K BE Comyn, M Craddock, MK Reiser, M Thomson, J TI HOM heating at the PEP-II B-Factory IR beryllium vacuum pipe SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The higher-order-mode (HOM) heating of the central beryllium beam pipe in the PEP-II B-Factory interaction region is evaluated. Both single and multi-bunch effects are considered. While single-bunch heating is not an issue, resonant heating due to multiple bunch passages is found to be unacceptable. Modifying the IR configuration around the central pipe has been shown to alleviate this problem. Simulation results indicate that the new design is sufficiently effective in reducing possible resonant heating down to a level that is within existing cooling requirements. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Lin, X (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 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 0-7803-4376-X PY 1998 BP 387 EP 389 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800121 ER PT B AU Pappas, GC Donaldson, AR Williams, D AF Pappas, GC Donaldson, AR Williams, D BE Comyn, M Craddock, MK Reiser, M Thomson, J TI The PEP II injection kicker system SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB PEP II or the B Factory consists of two asymmetric storage rings. The injection energy for electrons is 9 GeV, while that for positrons is 3.1 Gev. The bend angle into the high energy ring (HER) is 0.35 m-rad, and the angle into the low energy ring (LER) is 0.575 m-rad. The magnetic length for the HER kicker is 0.85 m, and 0.55 m for the LER kicker. The field produced by the magnet is therefore 123.5 G for the HER, and 132 G for the LER. Each ring has a kicker magnet upstream of the injection line which is used to distort the orbit of the stored beam. An identical magnet downstream of the injection line is used to restore the orbit of the stored beam and inject the incoming beam. The two magnets are driven in parallel by the modulator. The aperture of the magnets is 3.86x3.46 cm (HxV). Therefore the current required to drive the HER is 863 A, while for the LER it is 756 A. The inductance of the magnet is approximately 1.4 mu H/m. The current pulse is a critically damped sinusoid with a rise time of less than 300 ns. A kicker system has been designed which can be used for injection of both beams by varying the charge voltage. The modulator uses a conjugate circuit to match the impedance of the magnet, and coupling to the beam chamber. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94305 USA. RP Pappas, GC (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94305 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 0-7803-4376-X PY 1998 BP 390 EP 392 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800122 ER PT B AU Ehst, D Mokhov, NV Noble, RJ van Ginneken, A AF Ehst, D Mokhov, NV Noble, RJ van Ginneken, A BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Target options and yields for a muon collider source SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Efficient production and collection of a large number of muons is needed to make a muon collider viable. Target options are considered to maximize pion yield and to provide target survivability for 8 and 30 GeV primary beams of approximately 10(14) protons per pulse at 15 Hz. Realistic Monte-Carlo simulations are performed for targets of different configurations and dimensions in a high-field solenoid. Different materials, including liquid metals and coolants, are studied to optimize heat removal. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Ehst, D (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 0-7803-4376-X PY 1998 BP 393 EP 395 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800123 ER PT B AU Norem, J Ankenbrandt, C Griffin, J Johnstone, C Lee, SY Ng, KY Popovic, M Brennan, M Roser, T Wei, J Trbojevic, D AF Norem, J Ankenbrandt, C Griffin, J Johnstone, C Lee, SY Ng, KY Popovic, M Brennan, M Roser, T Wei, J Trbojevic, D BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Bunch shortening experiments in the Fermilab booster and the AGS SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The proton driver for a muon collider [1,2] must be capable of producing 2.5 x 10 13 p/bunch on target (in 4 bunches) in order to reach the design luminosity in the collider ring. Additionally, the bunches are very short, with an rms of only similar to 1 ns, to match the longitudinal emittance requirements of downstream capture, cooling, and acceleration systems. This criterion along with the high intensity places constraints on the proton driver design which will require both theoretical and experimental verification. This paper will discuss the bunch shortening techniques to be tested experimentally, the impact of longitudinal space charge, and potential instabilities in such an accelerator. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Norem, J (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 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 0-7803-4376-X PY 1998 BP 396 EP 398 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800124 ER PT B AU Norem, J Ankenbrandt, C Griffin, J Johnstone, C Lee, SY Popovic, M Ng, KY Brennan, M Roser, T Trbojevic, D Wei, J AF Norem, J Ankenbrandt, C Griffin, J Johnstone, C Lee, SY Popovic, M Ng, KY Brennan, M Roser, T Trbojevic, D Wei, J BE Comyn, M Craddock, MK Reiser, M Thomson, J TI The proton driver for the mu mu collider SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The proton driver for the mu mu collider might operate at about 15 Hz and produce four bunches of 2.5.10(13) protons/bunch at about 10 GeV (or half that number at 20 - 30 GeV) with an rms bunch length of about 1 nsec. A number of options have been considered to produce these bunches using: a) simple bunch rotation, b) energy slewing near gamma(t) followed by a fast increase of gamma(t) which facilitates bunching, and c) change of rf frequency in a ring-to-ring transfer. Flexible Momentum Compaction (FMC), or similar, lattices seem to offer control of gamma(t) even on short time scales. The large momentum spread, space charge tune shift and rapid bunching would tend to stabilize short, intense bunches, although I-pk similar to 1600 A. Both active (harmonic cavities) and passive (inductive wall) solutions have been considered to minimize high current beam effects. Magnet and vacuum systems would be similar to other high current designs. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Norem, J (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 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 0-7803-4376-X PY 1998 BP 399 EP 401 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800125 ER PT B AU Takahashi, H An, Y Chen, X Nomura, M AF Takahashi, H An, Y Chen, X Nomura, M BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Optimization of the target for muon colliders SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB We analyze the design of the target for pion production and energy deposition for the muon-muon collider using the nuclear cascade codes. Heat removal from high-energy deposition in the target is discussed, together with the use of a target compressed by a laser, or light- and heavy-ions drivers. The latter approach needs further technological development, but it can reduce substantially the energy needed to collect and control the produced muons. C1 Assoc Univ Inc, Brookhaven Natl Lab, Upton, NY 11973 USA. RP Takahashi, H (reprint author), Assoc Univ Inc, Brookhaven Natl Lab, Upton, NY 11973 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 0-7803-4376-X PY 1998 BP 402 EP 404 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800126 ER PT B AU Trbojevic, D Palmer, RB Courant, ED Gallardo, J Peggs, S Tepikian, S Ng, KY AF Trbojevic, D Palmer, RB Courant, ED Gallardo, J Peggs, S Tepikian, S Ng, KY BE Comyn, M Craddock, MK Reiser, M Thomson, J TI A lattice for the muon collider demonstration ring in the RHIC tunnel SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The future mu(+)mu(-) Muon Collider should have a luminosity of the order of 10(35) cm(-2)s(-1), an the energy of 2 x 2 TeV. We present here a demonstration machine at a lower energy to test the feasibility of all components involved, which could be placed inside the existing Relativistic Heavy Ion Collider (RHIC) tunnel. The maximum energy of the muons in the RHIC tunnel depends on the maximum attainable field in the dipoles. The maximum energy in the existing RHIC rings for protons is 250 GeV, where the strength of the magnetic field in the dipoles is 3.5 T. A design of the storage ring lattice for a 50 GeV muon demonstration machine is also presented. C1 Assoc Univ Inc, Brookhaven Natl Lab, Upton, NY 11973 USA. RP Assoc Univ Inc, Brookhaven Natl Lab, Upton, NY 11973 USA. EM dejan@bnl.gov; palmer@bnl.gov; gallardo@bnlarm.bnl.gov; peggs1@bnl.gov; ng@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 0-7803-4376-X PY 1998 BP 405 EP 407 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800127 ER PT B AU Zhao, Y Palmer, R Fernow, R Gallardo, J Kirk, H AF Zhao, Y Palmer, R Fernow, R Gallardo, J Kirk, H BE Comyn, M Craddock, MK Reiser, M Thomson, J TI A normal conducting accelerator for a muon collider demonstration machine SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB We present a 250 GeV linac arrangement using normal conducting cavities that could be used for a muon collider demonstration machine. One scenario consists of six 200 MHz linacs and rapid cycling pulsed magnets to be installed in a tunnel with six straight sections. The RF parameters of the cavities are given. Another scenario consists of 800 MHz. Also addressed is the possibility of using normal conducting cavities with liquid nitrogen cooling, which has several advantages. C1 Assoc Univ Inc, Brookhaven Natl Lab, Upton, NY 11973 USA. RP Zhao, Y (reprint author), Assoc Univ Inc, Brookhaven Natl Lab, Upton, NY 11973 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 0-7803-4376-X PY 1998 BP 408 EP 410 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800128 ER PT B AU Johnstone, CJ Garren, A AF Johnstone, CJ Garren, A BE Comyn, M Craddock, MK Reiser, M Thomson, J TI A ring lattice for a 2-TeV muon collider SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Johnstone, CJ (reprint author), Fermi Natl Accelerator Lab, POB 500, Batavia, IL 60510 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 0-7803-4376-X PY 1998 BP 411 EP 413 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800129 ER PT B AU Johnstone, CJ Mokhov, NV AF Johnstone, CJ Mokhov, NV BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Shielding the muon collider interaction region SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB One of the most serious technical problems in the design of a 2-TeV muon collider arises from muon decay. With 2 x 10(12) muons in a 2-TeV bunch, 2 x 10(5) mu->e nu<(nu)over tilde>, decays occur per meter. Immersed in strong magnetic fields, the induced electromagnetic showers deposit about 2 kW/meter in the storage ring; far surpassing the heat load capacity of cryogenic systems. Yet a more problematic background is the intense, highly directional, neutrino flux generated by the decays. This background does not respond to conventional shielding techniques; in fact the total radiation dose from neutrino interactions is worsened in the presence of shielding. The work presented here will discuss methods to reduce or compensate for the severe decay backgrounds and radiation produced in a very high-energy muon collider. C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA. RP Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA. EM cjj@fnal.gov; mokhov@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 0-7803-4376-X PY 1998 BP 414 EP 416 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800130 ER PT B AU Neuffer, D Van Ginneken, A AF Neuffer, D Van Ginneken, A BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Simulation studies of ionization cooling SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A mu(+)-mu(-) collider must compress the beam phase-space volume by a factor of similar to 10(6) to obtain high luminosity, and this beam cooling must occur before mu-decay. In this paper we present simulations of ionization cooling which explore the various conditions needed for cooling to collider conditions. Cooling by large factors is demonstrated and directions toward complete cooling scenarios are discussed. C1 Fermilab, Batavia, IL 60510 USA. RP Neuffer, D (reprint author), Fermilab, POB 500, Batavia, IL 60510 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 0-7803-4376-X PY 1998 BP 417 EP 419 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800131 ER PT B AU Shiltsev, VD AF Shiltsev, VD BE Comyn, M Craddock, MK Reiser, M Thomson, J TI An asymmetric muon-proton collider: Luminosity consideration SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB An asymmetric muon-proton collider is proposed as an instrument for possible quark structure search. Energy of proton beam is supposed to be some 5-6 times of muon energy. Estimated luminosity of the collider with two rings - the Tevatron accelerator and mu-ring - is found to be of the order of 10(33) s(-1) cm(-2). C1 Fermi Natl Accelerator Lab, Batavia, IL 60510 USA. RP Shiltsev, VD (reprint author), Fermi 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 0-7803-4376-X PY 1998 BP 420 EP 421 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800132 ER PT B AU Cheng, WH Sessler, AM Turner, WC Wurtele, JS AF Cheng, WH Sessler, AM Turner, WC Wurtele, JS BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Control of longitudinal collective behavior in the Muon Collider rings SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The longitudinal single bunch collective effects in a Muon Collider [1] ring are theoretically examined. The situation involves an intense bunch, a short bunch, a small momentum compaction, a rather large impedance compared with the stability threshold criterion, and a luminosity life time limited by muon decay to a thousand turns. Qualitative descriptions of stability are given and a scaling law for the instability threshold is derived. Numerical simulation results for the impedance-related instabilities are given for two cases of current interest - a 250 GeV x 250 GeV demonstration machine and a 2 TeV x 2 TeV high energy machine. The results of these simulations are in good agreement with the predictions of the scaling law and show that the longitudinal collective effects are controllable with a proper choice of parameters (viz. rf voltage, rf frequency, linear and non-linear longitudinal chromaticity). C1 Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Cheng, WH (reprint author), Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RI wurtele, Jonathan/J-6278-2016 OI wurtele, Jonathan/0000-0001-8401-0297 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 0-7803-4376-X PY 1998 BP 422 EP 424 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800133 ER PT B AU Seidel, M AF Seidel, M BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Studies of beam induced dipole-mode signals in accelerating structures at the SLC SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Beam emittance dilution by self induced transverse fields (wakefields) in accelerating structures is a key problem in linear accelerators. To minimize the wakefield effects the beam trajectory must be precisely centered within the structures. An efficient way to achieve this is to detect beam induced microwave signals in the lowest dipole mode band and to steer the beam by minimizing these signals. This paper briefly covers some experiences from SLC S-band structures, but mainly concentrates on results of a wakefield instrumentation scheme applied to a NLC prototype X-band structure and tested with beam in the SLC linac. A beam based in-situ structure straightness measurement is shown as well as results of beam steering experiments based on phase and amplitude detection of two separated modes in the structure. After centering the beam the reduction of the wakefield was demonstrated independently by probing it with a test bunch that is deflected by the residual wakefield at a short distance behind the drive bunch. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Seidel, M (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 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 0-7803-4376-X PY 1998 BP 434 EP 438 PG 5 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800136 ER PT B AU Ruth, RD Adolphsen, C Allison, S Atkinson, R Baumgartner, W Bong, P Brown, V Browne, M Caryotakis, G Cassel, R Cisneros, G Clark, SL Constant, T Corvin, C Dean, T Eichner, J Fowkes, R Fuller, R Gold, S Grippe, J Hanna, S Hoag, H Holik, P Holmes, S Humphrey, R Johnson, L Jones, R Jongewaard, E Ko, K Koontz, R Kroll, N Lavine, T Loew, GA Loewen, R Miller, RH Minister, J Nesterov, V Nantista, C Paterson, JM Pearson, C Phillips, R Pietryka, M Pope, R Porter, T Rifkin, J Roster, W Seidel, M Smith, H Smith, S Spencer, J Spencer, N Sprehn, D Tantawi, S Tenenbaum, P Tillghman, A Vlieks, A Vylet, V Wang, JW Wilson, PB Wilson, Z Wright, E Yeremian, D Zelinski, J Ziomek, C AF Ruth, RD Adolphsen, C Allison, S Atkinson, R Baumgartner, W Bong, P Brown, V Browne, M Caryotakis, G Cassel, R Cisneros, G Clark, SL Constant, T Corvin, C Dean, T Eichner, J Fowkes, R Fuller, R Gold, S Grippe, J Hanna, S Hoag, H Holik, P Holmes, S Humphrey, R Johnson, L Jones, R Jongewaard, E Ko, K Koontz, R Kroll, N Lavine, T Loew, GA Loewen, R Miller, RH Minister, J Nesterov, V Nantista, C Paterson, JM Pearson, C Phillips, R Pietryka, M Pope, R Porter, T Rifkin, J Roster, W Seidel, M Smith, H Smith, S Spencer, J Spencer, N Sprehn, D Tantawi, S Tenenbaum, P Tillghman, A Vlieks, A Vylet, V Wang, JW Wilson, PB Wilson, Z Wright, E Yeremian, D Zelinski, J Ziomek, C BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Results from the SLAC NLC Test Accelerator SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The design for the Next Linear Collider (NLC) at SLAG is based on two 11.4 GHz linacs operating at an unloaded acceleration gradient of 50 MV/m increasing to 85 MV/m as the energy is increased from 1/2 TeV to 1 TeV in the center of mass[1]. During the past several years there has been tremendous progress on the development of 11.4 GHz (X-band) RF systems. These developments include klystrons which operate at the required power and pulse length, pulse compression systems that achieve a factor of four power multiplication and structures that are specially designed to reduce long-range wakefields, Together with these developments, we have constructed a 1/2 GeV test accelerator, the NLC Test Accelerator (NLCTA)[2]. The NLCTA will serve as a test bed as the design of the NLC is refined. In addition to testing the RF system, the NLCTA is designed to address many questions related to the dynamics of the beam during acceleration, in particular, multibunch beam-loading compensation and transverse beam break-up. In this paper we describe the NLCTA and present results from initial experiments. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Ruth, RD (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. 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 0-7803-4376-X PY 1998 BP 439 EP 443 PG 5 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800137 ER PT B AU Decker, FJ Assmann, R Minty, MG Raimondi, P Stupakov, G AF Decker, FJ Assmann, R Minty, MG Raimondi, P Stupakov, G BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Super-asset: A technique for measuring and correcting accelerator structure misalignments at the SCL SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Transverse wakefield kicks from misaligned accelerating structures in the SLC linac contribute significantly to emittance growth. If these kicks could be measured directly, it would be possible to align and/or steer the beam to a kick-free trajectory. In the Accelerator Structure Test Facility at SLAG, ASSET [1], the kicks due to a drive bunch are measured with a witness bunch at varying bunch separations. In ASSET, the first bunch is discarded and only the second bunch is measured Super-ASSET is an extension of this technique where both bunches are accelerated down the entire linac together and a "sum trajectory" of both bunches is measured with beam position monitors (BPMs). The trajectory of the second, kicked bunch can be calculated by subtracting the orbit of the first bunch, measured alone, from the sum trajectory. This paper discusses BPM response issues and the expected resolution of this technique together with alignment and steering strategies. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Decker, FJ (reprint author), Stanford Univ, 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 0-7803-4376-X PY 1998 BP 449 EP 451 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800139 ER PT B AU Emma, P Hendrickson, LJ Raimondi, P Zimmermann, F AF Emma, P Hendrickson, LJ Raimondi, P Zimmermann, F BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Limitations of interaction-point spot-size tuning at the SLC SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB At the Stanford Linear Collider (SLC), the interaction-point spot size is minimized by repeatedly correcting, for both beams, various low-order optical aberrations, such as dispersion, waist position or coupling. These corrections are performed about every 8 hours, by minimizing the IP spot size while exciting different orthogonal combinations of final-focus magnets. The spot size itself is determined by measuring the beam deflection angle as a function of the beam-beam separation. Additional information is derived from the energy loss due to beamstrahlung and from luminosity-related signals. In the 1996 SLC run, the typical corrections were so large as to imply a 20-40% average luminosity loss due to residual uncompensated or fluctuating tunable aberrations. In this paper, we explore the origin of these large tuning corrections and study possible mitigations for the next SLC run. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Emma, P (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 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 0-7803-4376-X PY 1998 BP 452 EP 454 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800140 ER PT B AU Song, JJ Bajikar, S Kang, YW Kustom, RL Mancini, DC Nassiri, A Lai, B Feinerman, AD White, V AF Song, JJ Bajikar, S Kang, YW Kustom, RL Mancini, DC Nassiri, A Lai, B Feinerman, AD White, V BE Comyn, M Craddock, MK Reiser, M Thomson, J TI LIGA fabrication of mm-wave accelerating cavity structures at the advanced photon source (APS) SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res ID LITHOGRAPHY; RADIATION AB Recent microfabrication technologies based on the LIGA (German acronym for Lithographe, Galvanoformung, und Abformung) process have been applied to build high-aspect-ratio, metallic or dielectric planar structures suitable for high-frequency rf cavity structures. The cavity structures would be used as parts of linear accelerators, microwave undulators, and mm-wave amplifiers. The microfabrication process includes manufacture of precision x-ray masks, exposure of positive resist by x-rays through the mask, resist development, and electroforming of the final microstructure. Prototypes of a 32-cell, 108-GHz constant-impedance cavity and a 66-cell, 94-GHz constant-gradient cavity were fabricated with the synchrotron radiation sources at APS and NSLS. This paper will present an overview of the new technology and details of the mm-wave cavity fabrication. C1 Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. RP Song, JJ (reprint author), Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 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 0-7803-4376-X PY 1998 BP 461 EP 463 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800143 ER PT B AU Chou, PJ Bowden, GB Copeland, MR Henke, H Menegat, A Siemann, RH AF Chou, PJ Bowden, GB Copeland, MR Henke, H Menegat, A Siemann, RH BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Design and fabrication of a traveling-wave muffin-tin accelerating structure at 90 GHz SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A prototype of a muffin-tin accelerating structure operating at 32 times the SLAG frequency (2.856 GHz) was built for research in high gradient acceleration. A traveling-wave design with single input and output feeds was chosen for the prototype which was fabricated by wire electrodischarge machining. Features of the mechanical design for the prototype are described. Design improvements are presented including considerations of cooling and vacuum. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Chou, PJ (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 4 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 464 EP 466 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800144 ER PT B AU Tenenbaum, P Braun, HH Chautard, F AF Tenenbaum, P Braun, HH Chautard, F BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Nulling emittance measurement technique for CLIC Test Facility SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB In order to test the principle of Two-Beam-Acceleration (TBA), the CLIC Test Facility utilizes a high-intensity drive beam of 640 to 1000 nC to generate 30 GHz accelerating fields. To ensure that the beam is transported efficiently, a robust measurement of beam emittance and Twiss parameters is required. This is accomplished by measuring the beam size on a profile monitor, while scanning five or more upstream quadrupoles in such a fashion that the Twiss parameters at the profile monitor remain constant while the phase advance through the beam line changes. In this way the beam size can be sampled at different phases while a near-constant size is maintained at the profile monitor. This eases many of the difficulties of such measurement devices, especially those associated with limited dynamic range. In addition, the beam size is explicitly constant for a matched beam, which provides a "nulling" measurement of the match. Details of the technique, simulations, and results of the measurements are discussed. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94305 USA. RP Tenenbaum, P (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94305 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 0-7803-4376-X PY 1998 BP 479 EP 481 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800149 ER PT B AU Assmann, RW Decker, FJ Hendrickson, LJ Phinney, N Siemann, RH Underwood, KK Woodley, M AF Assmann, RW Decker, FJ Hendrickson, LJ Phinney, N Siemann, RH Underwood, KK Woodley, M BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Beam-based monitoring of the SLC linac optics with a diagnostic pulse SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The beam optics in a linear accelerator may be changed significantly by variations in the energy and energy spread profile along the linac. In particular, diurnal temperature swings in the SLC klystron gallery perturb the phase and amplitude of the accelerating RF fields. If such changes are not correctly characterized, the resulting errors will cause phase advance differences in the beam optics. In addition RF phase errors also affect the amplitude growth of betatron oscillations. We present an automated, simple procedure to monitor the beam optics in the SLC linac routinely and non-invasively. The measured phase advance and oscillation amplitude is shown as a function of time and is compared to the nominal optics. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Assmann, RW (reprint author), Stanford Univ, 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 0-7803-4376-X PY 1998 BP 497 EP 499 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800155 ER PT B AU Assmann, R Decker, FJ Seidel, M Siemann, RH Whittum, D AF Assmann, R Decker, FJ Seidel, M Siemann, RH Whittum, D BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Observation of dark-current signals from the S-band structures of the SLAC linac SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB It is well known that the electromagnetic fields in high-gradient RF structures can cause electron emission from the metallic structure walls. If the emitted electrons are captured and accelerated by the accelerating fields so-called "dark-current" is induced. Dark-currents have been measured and studied for various RF structures. In this paper we present measurements of RF induced signals for the SLC S-band structures. For nominal gradients of 17 MV/m it is shown that the dark-current can be strong enough to significantly reduce the signal-to-noise ratio of the SLC beam wire scanners. We also show results from RF measurements in the dipole band. The measurements ate compared to more direct observations of dark-current and it is tried to connect the results to possible effects on the accelerated particle beam. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Assmann, R (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 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 0-7803-4376-X PY 1998 BP 500 EP 502 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800156 ER PT B AU Assmann, RW Decker, FJ Raimondi, P Raubenheimer, TO AF Assmann, RW Decker, FJ Raimondi, P Raubenheimer, TO BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Observation and analysis of static deflections from transverse long-range wakefields in the SLC SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB In the SLC main linac a train of three bunches is accelerated. The leading positron bunch is followed by two bunches of electrons. When the positron bunch passes off-axis through the RF structures, it excites dipole modes in the structures, for example long-range transverse wakefields which deflect the subsequent electron bunches. Although the magnitude of the deflections is small one can infer the deflections by measuring the trajectory difference while changing the spacing between the positron and electron bunches. Knowing the positron trajectory the misalignments of the accelerating RF structures with respect to the BPM's can be calculated. We present measurements from the SLC linac and discuss the data analysis and errors. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Assmann, RW (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 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 0-7803-4376-X PY 1998 BP 503 EP 505 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800157 ER PT B AU Decker, FJ Akre, R Assmann, R Bane, KLF Minty, MG Phinney, N Spence, WL AF Decker, FJ Akre, R Assmann, R Bane, KLF Minty, MG Phinney, N Spence, WL BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Beam-based analysis of day-night performance variations at the SLC linac SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Diurnal temperature variations in the linac gallery of the Stanford Linear Collider (SLC) can affect the amplitude and phase of the rf used to accelerate the beam. The SLC employs many techniques for stabilization and compensation of these effects, but residual uncorrected changes still affect the quality of the delivered beam. This paper presents methods developed to monitor and investigate these errors through the beam response. Variations resulting from errors in the rf amplitude or phase can be distinguished by studying six different beam observables: betatron phase advance, oscillation amplitude growth, rms jitter along the linac, measurements of the beam phase with respect to the rf, changes in the required injection phase, and the global energy correction factor. By quantifying the beam response, an uncorrected variation of 14 degrees (S-band) during 28 degrees F temperature swings was found in the main rf drive line system between the front and end of the linac. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Decker, FJ (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 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 0-7803-4376-X PY 1998 BP 506 EP 508 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800158 ER PT B AU Decker, FJ Bane, KLF Minty, MG Raimondi, P Holtzapple, RL AF Decker, FJ Bane, KLF Minty, MG Raimondi, P Holtzapple, RL BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Longitudinal phase space setup for the SLC beams SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The longitudinal phase space distribution of the SLC beams is affected by many different machine parameters and constraints. By using a technique of over-compression [I] in the ring to linac transfer line, a small energy spread of 0.12 % can be achieved at the end of the linac for a bunch length of 1.2 mm (a). In the final focus a small energy spread is desirable to reduce emittance dilution due to chromatic effects. Optimization of the bunch length is also important as a longer bunch of 1.2 mm can contribute up to 40 % luminosity enhancement due to disruption. If there is a correlated energy variation along the bunch, for example due to mistuning of the optimal rf phase with respect to the beam, the bunch will be further compressed as it passes through the SLC Arcs. The resulting bunch can be too short to produce the desired disruption enhancement, but will radiate more beam-strahlung during collisions giving a false indication of higher luminosity. This paper discusses the interplay of these issues from the damping ring to the interaction point. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Decker, FJ (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 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 0-7803-4376-X PY 1998 BP 509 EP 511 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800159 ER PT B AU Irwin, J AF Irwin, J BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Dynamic focusing schemes for linear colliders SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB By using the intense fields of a demagnified bunch as a final lens, one can greatly simplify and shorten the conventional final focus and collimation systems of linear colliders. In the dynamic focusing schemes described here, the lens bunches enter the interaction region through separate beamlines. Design details and constraint equations for such focusing schemes are developed for future high energy linear colliders. C1 SLAC, Menlo Pk, CA 94025 USA. RP Irwin, J (reprint author), SLAC, 2575 Sand Hill Rd, Menlo Pk, CA 94025 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 0-7803-4376-X PY 1998 BP 512 EP 514 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800160 ER PT B AU Bane, KLE Timm, M Weiland, T AF Bane, KLE Timm, M Weiland, T BE Comyn, M Craddock, MK Reiser, M Thomson, J TI The short-range wakefields in the SBLC linac SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The short-range longitudinal and transverse wakefields of a point charge in the SBLC linac are obtained using a modal summation technique. Simple functional fits to these wakes are given, which can be used as Green functions in beam dynamics simulations of bunches. These results, however, are valid only after the beam has traversed a critical number of cells N-crit. Using time domain computations with Gaussian bunches we have obtained results that are consistent with N-crit varying as alpha a(2)/(L sigma(z)), with a the iris radius and L the period length of the structure, sigma(z) the bunch length and alpha a constant on the order of I. For the loss per cell to reach to within a few per cent of the asymptotic value we find that alpha similar to 0.5 - 1.0. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Bane, KLE (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94309 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 0-7803-4376-X PY 1998 BP 515 EP 517 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800161 ER PT B AU Hanna, SM Loewen, RJ Hoag, HA Miller, RH Ruth, RD Wang, JW AF Hanna, SM Loewen, RJ Hoag, HA Miller, RH Ruth, RD Wang, JW BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Development of characterization techniques for X-band accelerator structures SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The recent effort to develop accelerator structures for the Next Linear Collider (NLC), requires an accompanying development of accurate and efficient techniques to characterize these structures at different phases of development. At SLAG, we have been developing different microwave techniques to: verify predictions from computer simulations in the design phase, to insure that the machined cells are within the design tolerances, and finally, to confirm overall RF performance of the completed structure. For this final test, a semi-automated system was built to implement the bead-pulling technique under traveling-wave conditions. This technique maps the phase and amplitude of the axial electric field along the structure. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Palo Alto, CA 94304 USA. RP Hanna, SM (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Palo Alto, CA 94304 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 0-7803-4376-X PY 1998 BP 539 EP 541 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800169 ER PT B AU Whittum, DH Henke, H Chou, PJ AF Whittum, DH Henke, H Chou, PJ BE Comyn, M Craddock, MK Reiser, M Thomson, J TI High-gradient cavity beat-wave accelerator at W-Band SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res ID PLASMA AB Pulsed rf heating is a fundamental limit on high-gradient acceleration in copper structures. Reduction of pulsed heating is favored by a short exposure time for the copper; yet in conventional accelerators, efficiency requires an exposure time of order a cavity fill time. At W-Band, the cavity beat-wave transformer concept permits efficient energy transfer to resonant accelerating modes on a subnanosecond time-scale. We re-examine this acceleration scheme as it appears at W-Band, with attention to drive beam dynamics. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Whittum, DH (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 10 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 542 EP 544 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800170 ER PT B AU Jones, RM Wilson, PB AF Jones, RM Wilson, PB BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Minimizing RF system costs in a linear collider by an optimized choice of beam and structure parameters SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB In the design of future linear colliders it will be important to reduce the cost of the RF system by minimizing the total number of major system components (klystrons, modulators and pulse compression systems). In this paper we develop a procedure for performing this minimization by varying appropriate accelerating structure and beam parameters while maintaining a constant luminosity, AC "wall-plug" power and net beam-loaded accelerating gradient. Results for both standing-wave and traveling-wave accelerator structures are presented, including the plane-wave transformer and more conventional disk-loaded structures having cells with shaped (as opposed to purely cylindrical) outer boundaries and irises. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Jones, RM (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. OI Jones, Roger/0000-0001-6528-214X 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 0-7803-4376-X PY 1998 BP 545 EP 547 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800171 ER PT B AU Jones, RM Kroll, NM Miller, RH Ruth, RD Wang, JW AF Jones, RM Kroll, NM Miller, RH Ruth, RD Wang, JW BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Advanced damped detuned structure development at SLAC SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The first damped detuned accelerator structure, DDS 1, has been built, tested in the ASSET experiment, and installed in the NLCTA. The planning and construction of a series of further structures, incorporating some modifications, is under way. DDS 2, 3, and 4 all incorporate the same basic design as DDS I. The manifold design for the last 5 % of the downstream end of the structure has been modified to accommodate improvements in the manifold loads. Calculations based on the spectral function method indicate, on average, a factor two or better reduction in the long range wake. Modest modifications in the distribution of geometrical detuning parameters along the structure which, according to calculations based on spectral function theory, significantly improve the short range wake will be incorporated in DDS 3 and 4. The basic cell configuration will be redesigned in DDS 5 with the intention of improving shunt impedance as well as incorporating further improvements in the wake. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Jones, RM (reprint author), Stanford Linear Accelerator Ctr, M-S 26,POB 4349, Stanford, CA 94309 USA. OI Jones, Roger/0000-0001-6528-214X 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 0-7803-4376-X PY 1998 BP 548 EP 550 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800172 ER PT B AU Jones, RM Kroll, NM Miller, RH AF Jones, RM Kroll, NM Miller, RH BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Spectral function calculation of angle wakes, wake moments, and misalignment wakes for the SLAC damped detuned structures (DDS) SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Transverse wake functions so far reported for the SLAG DDS have been limited to those caused by uniform offset of the drive beam in a straight perfectly aligned structure. The complete description of the betatron oscillations of wake coupled bunches requires an array of wake functions, referred to as moments in [1]. Modifications of these arrays induced by structure misalignments are also of interest. In this paper we express the array elements in terms of a spectral function array. Examples are given based upon DDS1. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Stanford Linear Accelerator Ctr, M-S 26,POB 4349, Stanford, CA 94309 USA. EM nkroll@ucsd.edu; rhm@slac.stanford.edu OI Jones, Roger/0000-0001-6528-214X 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 0-7803-4376-X PY 1998 BP 551 EP 553 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800173 ER PT B AU Jones, RM Seidel, M Kroll, NM Miller, RH Adolphsen, C Bane, KLF Ruth, RD Wang, J AF Jones, RM Seidel, M Kroll, NM Miller, RH Adolphsen, C Bane, KLF Ruth, RD Wang, J BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Analysis and application of microwave radiation from the damping manifolds of the SLAC damped detuned structures (DDS) SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The power spectrum emerging from the damping manifolds of a DDS provides valuable quasi-local information on the displacement of a drive beam from the axis of individual cells, where the displacement may be due to beam offset, small cell misalignment, or a combination of the two. The degree of localization and the indexing of frequency to cell number is determined directly from the spectral function theory. Examples for specific DDS designs will be presented. These relations can be used to determine geometrical misalignment patterns. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Stanford Linear Accelerator Ctr, M-S 26,POB 4349, Stanford, CA 94309 USA. EM seidel@slac.stanford.edu; nkroll@ucsd.edu; rhm@slac.stanford.edu; star@slac.stanford.edu; rruth@slac.stanford.edu; jywap@slac.stanford.edu OI Jones, Roger/0000-0001-6528-214X 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 0-7803-4376-X PY 1998 BP 554 EP 556 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800174 ER PT B AU Anderson, DE Eylon, S Lidia, S Reginato, L Vanecek, D Yu, S Houck, T Westenskow, GA AF Anderson, DE Eylon, S Lidia, S Reginato, L Vanecek, D Yu, S Houck, T Westenskow, GA BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Design of a 1-MV induction injector for the Relativistic Klystron Two-Beam Accelerator SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res ID 2-BEAM ACCELERATOR AB A Relativistic Klystron Two-Beam Accelerator (RK-TBA) is envisioned as a rf power source upgrade of the Next Linear Collider. Construction of a prototype, called the RTA, based on the RK-TBA concept has commenced at the Lawrence Berkeley National Laboratory. This prototype will be used to study physics, engineering, and costing issues involved in the application of the RK-TBA concept to linear colliders. The first half of the injector, a 1 MeV, 1.2 kA, 300 ns induction electron gun, has been built and is presently being tested. The design of the injector cells and the pulsed power drive units are presented in this paper. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Anderson, DE (reprint author), Univ Calif Berkeley, Lawrence Berkeley 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 0-7803-4376-X PY 1998 BP 590 EP 592 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800186 ER PT B AU Erickson, R Allen, CW Anderson, S Linebarger, W Stanek, M AF Erickson, R Allen, CW Anderson, S Linebarger, W Stanek, M BE Comyn, M Craddock, MK Reiser, M Thomson, J TI SLAC accelerator operations report: 1995-1997 SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Operational statistics for the linear accelerator programs at SLAG are presented, including run-time records for SLC and the fixed-target programs. Also included are summaries of reliability and maintenance-related statistics. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Erickson, R (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94309 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 0-7803-4376-X PY 1998 BP 596 EP 598 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800188 ER PT B AU Li, ZH Miller, R Farkas, D Raubenheimer, T Tang, H Yeremian, D AF Li, ZH Miller, R Farkas, D Raubenheimer, T Tang, H Yeremian, D BE Comyn, M Craddock, MK Reiser, M Thomson, J TI A combined Delta T+Delta F beam loading compensation scheme for power saving SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The NLC low frequency (S and L band) rf linacs are heavily loaded by a beam of about 130 ns in macropulse length (90 bunches) and a current up to 2.75 Amps. Beam loading generates a large energy spread along the bunch train. For these linacs, the bunch train is much shorter than the filling time of these linac structures, and the energy of the beam drops approximately linearly with time during the purse as a result of beam loading. For such a case, there are two natural choices for beam loading compensation, Delta T (which achieves compensation by injecting the beam before the accelerator structure is full) and Delta F (which compensates by having some accelerator sections at f(0) +/- Delta F). There are, however, disadvantages with these methods: non-local compensation in the Delta F method (except using many short Delta F sections) and low efficiency in the Delta T method due to short filling time and amplitude modulation required for compensation. In this paper, we will discuss a combined Delta T + Delta F method. In this scheme, the filling time of the structure is optimized for Delta T compensation for phase-I operation. In phase-II operation, Delta F sections are used to compensate the extra 50% beam loading due to higher current. Simulations have shown that up to 30% of power can be saved by using this method. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Li, ZH (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 3 TC 0 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 599 EP 601 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800189 ER PT B AU Whittum, DH Siemann, RH AF Whittum, DH Siemann, RH BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Neutral beam collisions at 5 TeV SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res ID COLLIDERS AB At 5 TeV center-of-mass energy, collective effects are a prominent feature of electron-positron collisions, contributing to backgrounds and energy-spread, and suggesting a practical limit on the charge per bunch. To circumvent such collective phenomena we examine collision of neutral beams, with particular attention to the effect of mismatch and instability. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Whittum, DH (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. 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 0-7803-4376-X PY 1998 BP 602 EP 604 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800190 ER PT B AU Wilson, PB Raubenheimer, T Ruth, RD AF Wilson, PB Raubenheimer, T Ruth, RD BE Comyn, M Craddock, MK Reiser, M Thomson, J TI RF system for a 30 GHz, 5 TeV linear collider based on conventional technology SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB In order that if may be built within a reasonable length and with reasonable ac power consumption, a 5 TeV linear collider must employ an accelerating gradient and rf frequency which are both higher than for present 1 TeV collider designs. The required peak rf power per meter, which will also be higher than for I TeV designs, can be provided either by relatively conventional rf technology or by a two-beam scheme such as that proposed for CLIC. In this paper the first alternative, a 30 GHz rf system employing microwave tube power sources together with rf pulse compression, is described which produces an accelerating gradient on the order of 200 MV per meter. Limitations on the peak power that can be obtained from conventional klystrons as a function of frequency are discussed; it is found that such klystrons are only marginally adequate as a power source at 30 GHz. Several alternative rf sources, such as multiple-beam klystrons, sheet-beam klystrons, gyroklystrons and annular-beam ubitrons are described which are capable of providing the required power, after pulse compression, of about 600 MW per meter. C1 Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Wilson, PB (reprint author), Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. NR 10 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 605 EP 607 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800191 ER PT B AU Zimmermann, F Adolphsen, C Assmann, R Bane, K Burke, D Decker, FJ Emma, P Helm, R Hendrickson, L Hertzbach, S Irwin, J Jarvis, H Krejcik, P Minty, M Phinney, N Raimondi, P Ross, M Spencer, J Tang, H Tenenbaum, P Thompson, K Walz, D Yeremian, AD AF Zimmermann, F Adolphsen, C Assmann, R Bane, K Burke, D Decker, FJ Emma, P Helm, R Hendrickson, L Hertzbach, S Irwin, J Jarvis, H Krejcik, P Minty, M Phinney, N Raimondi, P Ross, M Spencer, J Tang, H Tenenbaum, P Thompson, K Walz, D Yeremian, AD BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Performance issues, downtime recovery and tuning in the next linear collider (NLC) SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Zimmermann, F (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 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 0-7803-4376-X PY 1998 BP 608 EP 610 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800192 ER PT B AU van Steenbergen, A Gallardo, JC AF van Steenbergen, A Gallardo, JC BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Inverse free electron laser accelerator development SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The theoretical study of Inverse Free Electron Lasers (IFEL) as a potential mode of electron acceleration has been pursued at Brookhaven National Laboratory(BNL) for a number of years. As part of this program a proof-of-principle experiment with a single module accelerator unit has been recently successfully carried out. The IFEL accelerator made use of the 40 MeV linac beam and high power CO2 laser beam of the Accelerator Test Facility (ATF), at BNL, in conjunction with a fast excitation, tapered period, wiggler. Basic aspects of the design of this single module IFEL accelerator will be presented, together with the experimental results of Delta E/E as a function of the IFEL parameters. Comparison with analytical and 1,3-D numerical simulations clearly establish the IFEL character of the electron - EM wave energy exchange, permitting thereby scaling to higher laser power magnitude and acceleration gradients. In addition, planned near term IFEL accelerator development will he indicated, incorporating the use of the IFEL as a beam prebuncher preceding a Inverse Cherenkov Accelerator, and the use of two IFEL modules in cascade in order to more realistically test the feasibility of a multimodule IFEL accelerator. C1 Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. RP van Steenbergen, A (reprint author), Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA. OI Gallardo, Juan C/0000-0002-5191-3067 NR 18 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 616 EP 620 PG 5 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800194 ER PT B AU Liu, Y Cline, DB Wang, XJ Babzien, M Fang, JM Gallardo, J Kusche, K Pogorelsky, I Skaritka, J van Steenbergen, A AF Liu, Y Cline, DB Wang, XJ Babzien, M Fang, JM Gallardo, J Kusche, K Pogorelsky, I Skaritka, J van Steenbergen, A BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Experimental observation of IFEL micro-bunching using coherent transition radiation SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res ID ELECTRON AB Electron beam bunching in the optical wavelength was observed experimentally for the first time at the Brookhaven Accelerator Test Facility(ATF) using the Inverse Free Electron(IFEL) accelerator. The micro-bunched electron beam has been studied by measuring the coherent transition radiation (CTR). We have experimentally observed a quadratic dependency of the CTR signal with the charge of the electron beam and the observation distance. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Liu, Y (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA. OI Gallardo, Juan C/0000-0002-5191-3067 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 0-7803-4376-X PY 1998 BP 621 EP 623 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800195 ER PT B AU Gai, W Conde, M Konecny, R Li, X Power, J Schoessow, P Simpson, J AF Gai, W Conde, M Konecny, R Li, X Power, J Schoessow, P Simpson, J BE Comyn, M Craddock, MK Reiser, M Thomson, J TI The Argonne Wakefield Accelerator: Upgrade scenarios and future experiments SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res ID FIELD AB The Argonne Wakefield Accelerator is presently operational and nearing completion of its initial dielectric structure- and plasma-based experimental program. In this paper a number of possible future improvements and directions for the AWA are discussed including photocathode source upgrades, laser pulse and beam shaping options, multiple drive bunch generation, and never wakefield device measurements. Plans for a I GeV demonstration wakefield accelerator will be presented. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Gai, W (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 10 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 633 EP 635 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800199 ER PT B AU Gai, W Konecny, R Simpson, J AF Gai, W Konecny, R Simpson, J BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Externally powered dielectric loaded waveguides as accelerating structures SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB There have been numerous studies examining the use of dielectric materials in accelerating structures in the past. Such studies and related experiments generally concluded that dielectric losses, with the resulting high power requirements, and field breakdown problems made such devices not very attractive. However, development of high dielectric constant, low loss materials plus new demands for emittance preserving acceleration warrant a new look at the idea, In this paper, we discuss reference parameter designs for S-band and X-band structures and show that dielectric loaded guide may now be practical and have certain advantages over conventional iris loaded structures. Preliminary experimental test results of X-band dielectric devices are reported. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Gai, W (reprint author), Argonne Natl Lab, 9700 S Cass Ave,Bldg 362, Argonne, IL 60439 USA. NR 6 TC 3 Z9 3 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 636 EP 638 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800200 ER PT B AU Schoessow, P Conde, M Gai, W Konecny, R Power, J Simpson, J AF Schoessow, P Conde, M Gai, W Konecny, R Power, J Simpson, J BE Comyn, M Craddock, MK Reiser, M Thomson, J TI High gradient dielectric wakefleld device measurements at the Argonne Wakefield Accelerator SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The Argonne Wakefield Accelerator (AWA) is a facility designed to investigate high gradient wakefield acceleration techniques. Wakefields are excited using a drive beam produced by a 14 MeV high current photoinjector-based linac. A second photocathode gun generates a 4 MeV witness beam which is used as a probe of the wakefields in the device under test. The delay of the witness bunch with respect to the drive bunch can be continuously varied from -100 ps to >1 ns. The drive and witness bunches propagate along collinear or parallel trajectories through the test section. A dipole spectrometer is then used to measure the energy change of the witness beam. The complete wakefield measurement system has been commissioned and wakefield experiments using dielectric structures are underway. Initial experiments have focused on collinear wakefield device geometries where the drive and witness bunches traverse the same structure. For attaining very high gradients we will construct and study step-up transformer structures in which the rf pulse generated by the drive beam is compressed transversely and longitudinally. C1 Argonne Natl Lab, Argonne, IL 60439 USA. RP Schoessow, P (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 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 0-7803-4376-X PY 1998 BP 639 EP 641 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800201 ER PT B AU Parsa, Z Marshall, TC AF Parsa, Z Marshall, TC BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Enhanced IFEL performance using a novel wiggler SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res ID ELECTRON-LASER ACCELERATOR AB In the conventional inverse free electron laser (IFEL), electron acceleration is done via the interaction of an intense laser beam and a wiggler with a sinusoidal field variation. We have studied the effect on IFEL performance using a wiggler that creates a nearly square-wave periodic field pattern [1,2]. A novel numerical technique is described which models this wiggler Ell. We find stable orbits and an improvement in IFEL acceleration gradient, resulting in a gain in energy by as much as a factor of two (equivalent to four times the laser power), when compared with the conventional IFEL with a sinusoidal field wiggler [3]. In an experiment, the magnetic field can be synthesized by running a conventional ferromagnetic wiggler into saturation. C1 Brookhaven Natl Lab, Upton, NY 11973 USA. RP Parsa, Z (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 0-7803-4376-X PY 1998 BP 642 EP 644 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800202 ER PT B AU Pogorelsky, IV Ben-Zvi, I AF Pogorelsky, IV Ben-Zvi, I BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Emerging terawatt picosecond CO2 laser technology and possible applications in accelerator physics SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res ID COLLIDERS AB The first terawatt picosecond (TWps) CO2 laser is under construction at the BNL Accelerator Test Facility (ATF). TWps-CO2 lasers, having the order of magnitude longer wavelength than the well-known table-top terawatt solid state lasers, offer new opportunities for the strong-field physics research. For processes based on electron quiver motion, such as laser wakefield acceleration (LWFA), the advantage of the new class of lasers is due to a gain of two orders of magnitude in the ponderomotive potential for the same peak power. The large average power capability of CO2 lasers is important for the generation of hard radiation through Compton back-scattering of the laser off energetic electron beams, as well as for other applications. Among them are: LWFA modules of a tentative electron-positron collider, gamma-gamma (or gamma-lepton) collider, a possible "table-top" source of high-intensity x-rays and gamma rays and the generation of polarized positron beams. C1 Brookhaven Natl Lab, NSLS, Upton, NY 11973 USA. RP Pogorelsky, IV (reprint author), Brookhaven Natl Lab, NSLS, Upton, NY 11973 USA. NR 10 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 645 EP 647 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800203 ER PT B AU Govil, R Wheeler, SJ Leemans, WP AF Govil, R Wheeler, SJ Leemans, WP BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Experimental observation of electron beam focusing through plasma lenses SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A comprehensive experimental study of focusing of relativistic electron beams with overdense and underdense plasma lenses is being conducted at the Beam Test Facility at LBNL [I]. Short (15ps rms) electron bunches, from the 50 MeV LBM, Advanced Light Source injector are transported through laser produced plasmas. The electron beam spot size and divergence at the plasma lens is adjusted using quadrupoles. The plasmas are 1-5 cm long with densities of 10(13) -10(14) cm(-3). By changing the laser intensity and shape, the plasma density and profile can be controlled. This allows for exploration of both the charge and current compensation regimes, by changing the ratio of the plasma wavenumber, k(p), to the electron beam size, a, Experimental results on the production of plasma through two-photon UV ionization and electron beam diagnostics have been presented earlier [2]. Here we present results from experimentally observed plasma focusing for overdense lenses in charge and current compensation regimes. Detailed interferometric results from the production of highly overdense plasmas are also discussed. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Govil, R (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 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 0-7803-4376-X PY 1998 BP 654 EP 656 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800206 ER PT B AU Volfbeyn, P Lee, PB Wurtele, JS Leemans, WP AF Volfbeyn, P Lee, PB Wurtele, JS Leemans, WP BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Driving laser pulse evolution in a laser wakefield accelerator SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res ID PLASMA; EXCITATION AB A numerical study of the coupling between a high intensity laser pulse and a plasma wake is presented, in the context of laser wakefield acceleration in a hollow channel. One dimensional self-consistent equations are derived and numerically solved to provide a more detailed description of the laser pulse evolution for the case of propagation in a uniform plasma. The model obtained provides a simple method for inferring the plasma wake characteristics from measurement of changes in phase and amplitude of the driving laser pulse. C1 Univ Calif Berkeley, Ernest Orlando Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. RP Volfbeyn, P (reprint author), Univ Calif Berkeley, Ernest Orlando Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA. RI wurtele, Jonathan/J-6278-2016 OI wurtele, Jonathan/0000-0001-8401-0297 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 0-7803-4376-X PY 1998 BP 657 EP 659 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800207 ER PT B AU Xie, M AF Xie, M BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Laser acceleration in vacuum with an open iris-loaded waveguide SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB An open iris-loaded waveguide structure is considered for laser acceleration of highly relativistic particle in vacuum. Complete characterization of all eigenmodes are given in analytical form for the structure. In particular the dominant radially polarized TM mode is evaluated in detail for laser acceleration. The entire parameter space is searched and it is found that below the laser damage threshold of the structure an acceleration gradient around 1 GV/m can be obtained over a phase slippage length of 10s of cm with TWs laser in the wavelength range from 1 to 10 mu m. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Xie, M (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 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 0-7803-4376-X PY 1998 BP 660 EP 662 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800208 ER PT B AU Shvets, G Stoltz, P AF Shvets, G Stoltz, P BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Beam slicing with lasers and plasmas for high-transformer-ratio plasma wakefield acceleration SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A novel method of "slicing" electron beams - Laser-Plasma Scissors (LPS) is suggested. Generation of the sharp-edged beams for high-transformer-ratio plasma wakefield acceleration (PWA) is considered numerically and analytically. Slicing, high-transformer-ratio acceleration, and beam loading are studied numerically, using a one-dimensional code which treats plasma as a linear medium and electron beams as a collection of macroparticles. A tentative design of a multi-stage PWA with laser slicing is presented. Other applications of LPS include generation of ultra-short bunches for sychrotron radiation. C1 Princeton Plasma Phys Lab, Princeton, NJ 08543 USA. RP Shvets, G (reprint author), Princeton Plasma Phys Lab, POB 451, Princeton, NJ 08543 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 0-7803-4376-X PY 1998 BP 669 EP 671 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800211 ER PT B AU Chou, PJ Bowden, GB Copeland, MR Henke, H Menegat, A Pritzkau, DP Siemann, RH AF Chou, PJ Bowden, GB Copeland, MR Henke, H Menegat, A Pritzkau, DP Siemann, RH BE Comyn, M Craddock, MK Reiser, M Thomson, J TI RF measurements of a traveling-wave muffin-tin accelerating structure at 90 GHz SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A measuring system at the table-top scale was developed for RF measurements of a muffin-tin accelerating structure operating at 32 times the SLAG frequency (2.856 GHz). Both perturbation and nonperturbation methods are employed to characterize the RF properties of a muffin-tin structure. Conventional bead pull measurements are extended to millimeter wavelengths. Design of the measuring system and preliminary results of RF measurements are presented. C1 Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA. RP Chou, PJ (reprint author), Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 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 0-7803-4376-X PY 1998 BP 672 EP 674 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800212 ER PT B AU Decker, G AF Decker, G BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Performance of the Advanced Photon Source SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The Advanced Photon Source (APS) positron storage ring is a 100-mA, 7-GeV, third-generation x-ray synchrotron radiation source which began operation in March 1995. Since that time, significant progress on beamline construction and commissioning has taken place, with many of the x-ray user beamlines in operation. Operational design goals which have been met or exceeded include < 8.2-nm-rad emittance, > IO-hour lifetime, > 90% availability, > 100-mA average current, > 5-mA single-bunch current, < 10% uncorrected coupling, 8-mm full vertical apertures for insertion devices, and ultra-stable orbit (< 4.5 mu m rms vertically, 17 mu m horizontally). Progress beyond the-se design goals and a report on development plans, including top-up operation (injection with x-ray beamline shutters open), are presented. C1 Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. RP Decker, G (reprint author), Argonne Natl Lab, Adv Photon Source, 9700 S Cass Ave, Argonne, IL 60439 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 0-7803-4376-X PY 1998 BP 698 EP 702 PG 5 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800221 ER PT B AU Jackson, A AF Jackson, A BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Improving and extending performance at synchrotron radiation facilities SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res ID LASER AB Synchrotron radiation facilities around the world have now matured through three generations. facilities have all met or exceeded their design specifications and are learning how to cope with the ever more demanding requests of the user community, especially concerning beam stability. The older facilities remain competitive by extending the unique features of their design, and by developing novel insertion devices. In this paper we survey the beam characteristics achieved at third-generation sources and explore the improvements made at earlier generation facilities. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Adv Light Source Ctr, Berkeley, CA 94720 USA. RP Jackson, A (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Adv Light Source Ctr, Berkeley, CA 94720 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 0-7803-4376-X PY 1998 BP 703 EP 707 PG 5 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800222 ER PT B AU Safranek, J AF Safranek, J BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Beam-based modeling and control of storage rings SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Analysis of the measured orbit response matrix is a powerful technique for debugging the linear optics of storage rings. The orbit response matrix is the change in orbit at the beam position monitors (BPMs) with changes in steering magnet excitation. Results will be presented from a computer code called LOGO (Linear Optics from Closed Orbits) [1] that has been used to analyze the response matrices from several synchrotron light sources including the ALS, NSLS VUV, NSLS X-Ray, and SRRC storage rings. The analysis accurately determines the individual quadrupole magnet gradients as well as the gains of BPMs and the calibrations of the steering magnets. The coupling terms of the response matrix such as the shift in vertical orbit from horizontal steering magnets can be included in the analysis to give the role of the quadrupoles, BPMs and steering magnets. The LOGO code can also be used to find the changes in quadrupole gradient that best compensate far gradient errors from insertion devices and sextupoles. In this way the design periodicity of the linear optics can be restored. C1 Brookhaven Natl Lab, Natl Synchrotron Light Source, Upton, NY 11973 USA. RP Safranek, J (reprint author), Brookhaven Natl Lab, Natl Synchrotron Light Source, 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 0-7803-4376-X PY 1998 BP 708 EP 712 PG 5 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800223 ER PT B AU Stefan, PM Krinsky, S Kao, CC Rakowsky, G Singh, O Solomon, L AF Stefan, PM Krinsky, S Kao, CC Rakowsky, G Singh, O Solomon, L BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Insertion device development in the X13 straight of the NSLS X-Ray Ring SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB On the NSLS X-Ray Storage Ring, the X13 straight section and beamline have been used for insertion-device-related R&D since 1990. We will describe three important projects: The Prototype Small-Gap Undulator (PSGU), the In-Vacuum Undulator (IVUN), and the Time Varying Elliptically Polarized Wiggler (EPW). The PSGU has successfully operated with a vertical aperture of only 3 mm, with minimal reduction in electron beam lifetime. The EPW has successfully run during regular user operations while switching at either 2 Hz or 100 Hz, with no adverse effects on other experiments. The IVUN project is a collaboration between NSLS and Spring-8, and installation is scheduled for May 1997. C1 Brookhaven Natl Lab, NSLS, Upton, NY 11973 USA. RP Stefan, PM (reprint author), Brookhaven Natl Lab, NSLS, Upton, NY 11973 USA. NR 10 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 727 EP 729 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800228 ER PT B AU Krafft, GA AF Krafft, GA BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Use of Jefferson Lab's high average power fel as a Thomson backscatter X-ray source SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Recently, workers from Berkeley have measured Thomson forward scattered X-rays at the ALS injector. The average power of their device was limited by, among other things, the repetition rate of the high power laser. In order to achieve high average power, it is natural to investigate the possibility of backscatter from the recirculating optical pulses in Jefferson Lab's CW IRFEL, now under construction. Photon brightnesses of order 10(7) photons/(sec mm(2) mrad(2)) will be produced at this facility, with a spectrum extending up to 7 keV in energy, in the present operating mode. A near-term upgrade to 75 MeV yields about 30 keV photons with similar brightness. In the longer term, the UV upgrade of our device could potentially produce 4 MeV photons with substantially higher brightness. Scaling laws for such configurations are given and these three cases are presented in detail. C1 TJNAF, Newport News, VA 23606 USA. RP Krafft, GA (reprint author), TJNAF, 12000 Jefferson Ave, Newport News, VA 23606 USA. NR 4 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 739 EP 741 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800232 ER PT B AU Borland, LEM AF Borland, LEM BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Advances in orbit drift correction in the Advanced Photon Source storage ring SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The Advanced Photon Source storage ring is required to provide X-ray beams of high positional stability, specified as 17 mu m rms in the horizontal plane and 4.4 mu m rms in the vertical plane. We report on the difficult task of stabilizing the slow drift component of the orbit motion down to a few microns rms using workstation-based orbit correction. There are two aspects to consider separately-the correction algorithm and the configuration of the beam position monitors (BPMs) and correctors. Three notable features of the correction algorithm are: low-pass digital filtering of BPM readbacks; "despiking" of the filtered orbit to desensitize the orbit correction to spurious BPM readbacks without having to change the correction matrix; and BPM intensity-dependent offset compensation. The BPM/corrector configuration includes all of the working BPMs but only a small set of correctors distributed around the ring. Thus only those orbit modes that are most likely to be representative of real beam drift are handled by the correction algorithm. C1 Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. RP Borland, LEM (reprint author), Argonne Natl Lab, Adv Photon Source, 9700 S Cass Ave, Argonne, IL 60439 USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 742 EP 744 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800233 ER PT B AU Kim, SH Decker, G Doose, C Mangra, D Merl, R AF Kim, SH Decker, G Doose, C Mangra, D Merl, R BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Investigation of open-loop beam motion at low frequencies at the APS SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Sources of transverse beam motion in the APS storage ring have been investigated for ground-motion- and water-system-induced vibrations of the magnet and vacuum systems, and for power supply ripple. The displacement of magnets in a bandwidth of 4-30 Hz have been reduced significantly by inserting viscoelastic damping pads between the girder supports and pedestals, and by welding the magnet cooling headers to the ceiling of the storage ring tunnel. Current ripple on magnet power supplies was identified as a source of horizontal beam motion. Beam motion was measured without the closed-orbit feedback system activated. At beta(x)=15.4 m and beta(y)=10.4 m the rms beam motion in the 0.02-30 Hz band was 22.7 mu m and 6.3 mu m in the horizontal and vertical planes, respectively. A few narrow-band structures of the horizontal beam motion spectrum in the 1-4 Hz band have to be investigated further to identify the sources. C1 Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA. RP Kim, SH (reprint author), Argonne Natl Lab, Adv Photon Source, 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 0-7803-4376-X PY 1998 BP 745 EP 747 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800234 ER PT B AU Safranek, J Kramer, SL AF Safranek, J Kramer, SL BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Experimental calibration of VUV Ring optics SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The individual quadrupole gradients, undulator focusing, beam position monitor (BPM) gains, and orbit steering magnet calibrations in the NSLS VUV Ring were determined by analyzing the measured orbit response matrix with the computer code LOCO[1] (Linear Optics from Closed Orbits). The measured orbit response matrix is the change in orbit at the BPMs with changes in steering magnet excitation. The analysis showed beta function distortions of +/- 35% and +/- 25% horizontally and vertically. The design periodicity of the optics was restored by adjusting the quadrupole gradients to restore the periodicity of the response matrix. This lead to an increase of about 18 percent in the beam lifetime at 500 mA with a slight (3 and 7 percent) decrease in both the horizontal and vertical electron emittances as determined from the beam sizes measured using a synchrotron light monitor. C1 Brookhaven Natl Lab, Natl Synchrotron Light Source, Upton, NY 11973 USA. RP Safranek, J (reprint author), Brookhaven Natl Lab, Natl Synchrotron Light Source, 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 0-7803-4376-X PY 1998 BP 748 EP 750 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800235 ER PT B AU Byrd, J AF Byrd, J BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Longitudinal beam transfer function diagnostics in the ALS SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB We describe the technique of longitudinal beam transfer function (BTF) for measuring several properties of longitudinal oscillations in a electron storage ring such as the synchrotron frequency, radiation damping time, and bunch length. The technique takes advantage of the Gaussian distribution of longitudinal oscillation amplitudes within the bunch at very low current and the dependence of synchrotron frequency on amplitude. Results of measurements made at the Advanced Light Source (ALS) are presented. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Byrd, J (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, 1 Cyclotron Rd, Berkeley, CA 94720 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 0-7803-4376-X PY 1998 BP 769 EP 771 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800242 ER PT B AU Byrd, JM Barry, W AF Byrd, JM Barry, W BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Controlling the vertical mode coupling instability with feedback in the advanced light source SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB We present the results of experiments to control the mode coupling instability in the vertical direction using a feedback system. Presently, we can raise the instability threshold from similar to 20 mA to 35 mA. The maximum current threshold is reached when the feedback is operated in a resistive made. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, ALS Acc Phys Grp, Berkeley, CA 94720 USA. RP Byrd, JM (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, ALS Acc Phys Grp, Berkeley, CA 94720 USA. NR 10 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 772 EP 774 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800243 ER PT B AU Hinkson, J Keller, R Byrd, J Lumpkin, A AF Hinkson, J Keller, R Byrd, J Lumpkin, A BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Commissioning of the advanced light source dual-axis streak camera SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB A dual-axis streak camera, Hamamatsu model C5680, has been installed on the Advanced Light Source photon-diagnostics beam-line to investigate electron-beam parameters. During its commissioning process, the camera has been used to measure single-bunch length vs. current, relative bunch charge in adjacent RF buckets, and bunch-phase stability. In this paper we describe the visible-light branch of the diagnostics beam-line, the streak-camera installation, and the timing electronics. We will show graphical results of beam measurements taken during a variety of accelerator conditions. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Hinkson, J (reprint author), Univ Calif Berkeley, Lawrence Berkeley 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 0-7803-4376-X PY 1998 BP 775 EP 777 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800244 ER PT B AU Jackson, A Byrd, J Decking, L Howells, M Keller, R Kim, CH Massoletti, D Nishimura, H Robin, D Zyngier, H AF Jackson, A Byrd, J Decking, L Howells, M Keller, R Kim, CH Massoletti, D Nishimura, H Robin, D Zyngier, H BE Comyn, M Craddock, MK Reiser, M Thomson, J TI ALS-N - A candidate for a next-generation synchrotron light-source SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res C1 Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Jackson, A (reprint author), Lawrence Berkeley Lab, 1 Cyclotron Rd, Berkeley, CA 94720 USA. NR 6 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 778 EP 780 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800245 ER PT B AU Keller, R AF Keller, R BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Transfer functions for the ALS lattice magnets SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The primary purpose of the magnetic measurements performed on the ACS storage-ring lattice-magnets was to ascertain their compliance with the strict tolerances established for this third-generation synchrotron light source. In the course of the data evaluation, a novel approximation method has been developed that leads to four-parameter rep resentations of all magnet transfer-functions, and includes saturation and residual field effects. These transfer functions were used to change the standard working point of the ALS storage ring at 1.5-GeV beam energy from the upper to the lower hysteresis branches, and later to ramp the ring energy from 1.5 GeV to the maximum design value of 1.9 GeV in one uninterrupted process that did not require any intermediate tune correction. Likewise, predicted magnet set values for 1.0-GeV conditions were applied and very closely led to the standard betatron tunes. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Adv Light Source Ctr, Berkeley, CA 94720 USA. RP Keller, R (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Adv Light Source Ctr, Berkeley, CA 94720 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 0-7803-4376-X PY 1998 BP 781 EP 783 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800246 ER PT B AU Keller, R Nishimura, H AF Keller, R Nishimura, H BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Orbit stability of the ALS storage ring. SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The Advanced Light Source (ALS) storage ring [1], a synchrotron light source of the third generation, is specified to maintain its electron orbit stable within one tenth of the rms beam size. In the absence of a dedicated orbit feed-back system, several orbit-distorting effects were investigated, aided by a new interactive simulation tool, the code TRACY-V. The effort has led to a better understanding of the behavior of a variety of accelerator subsystems and in consequnence produced a substantial improvement in day-to-day orbit stability. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Adv Light Source Ctr, Berkeley, CA 94720 USA. RP Keller, R (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Adv Light Source Ctr, Berkeley, CA 94720 USA. 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 0-7803-4376-X PY 1998 BP 784 EP 786 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800247 ER PT B AU Keller, R AF Keller, R BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Tune-split effects at the ALS storage ring SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB This paper is concerned with operational characteristics of the Advanced Light Source (ALS) storage ring, a synchrotron light source of the third generation that is capable of operating between 1.0 and 1.9 GeV beam energy. Even though the magnetic properties of its lattice magnets appeared to be very well understood an anomaly was observed with the measured betatron tunes when the working point of any of the three quadrupole families or the bend magnets was switched from the upper to the lower hysteresis branch. In no case was it then possible to recover the standard horizontal and vertical tune values simultaneously at any given excitation current; either one was considerably off normal when the other one was set to the proper value. The nature of this so-called "tune-split effect" was investigated, and the solution to the problem is presented here, together with an outlook on consequences for operational scenarios resulting from this effect. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Adv Light Source Ctr, Berkeley, CA 94720 USA. RP Keller, R (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Adv Light Source Ctr, 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 0-7803-4376-X PY 1998 BP 787 EP 789 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800248 ER PT B AU Kim, CH AF Kim, CH BE Comyn, M Craddock, MK Reiser, M Thomson, J TI A code for calculating the time evolution of beam parameters in high intensity circular accelerators SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB Beam emittances in a circular accelerator with a high beam intensity are strongly affected by the small angle intrabeam Coulomb scattering. In the computer simulation model we present here we used three coupled nonlinear differential equations to describe the evolution of the emittances in the transverse and the longitudinal planes. These equations include terms which take into account the intra-beam scattering, adiabatic damping, microwave instabilities, synchrotron damping, and quantum excitations. A code is generated to solve the equations numerically and incorporated into a FORTRAN code library. Circular high intensity physics routines are included in the library such as intrabeam scattering, Touschek scattering, and the bunch lengthening effect of higher harmonic cavities. The code runs presently in the PC environment. Description of the code and some examples are presented. C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Div Accelerator & Fus Res, Berkeley, CA 94720 USA. RP Kim, CH (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Div Accelerator & Fus Res, Berkeley, CA 94720 USA. NR 6 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-4376-X PY 1998 BP 790 EP 792 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800249 ER PT B AU Krebs, GF AF Krebs, GF BE Comyn, M Craddock, MK Reiser, M Thomson, J TI Measurement of storage ring motion at the advanced light source SO PROCEEDINGS OF THE 1997 PARTICLE ACCELERATOR CONFERENCE, VOLS 1-3: PLENARY AND SPECIAL SESSIONS ACCELERATORS AND STORAGE RINGS - BEAM DYNAMICS, INSTRUMENTATION, AND CONTROLS LA English DT Proceedings Paper CT 17th Particle Accelerator Conference CY MAY 12-16, 1997 CL VANCOUVER, CANADA SP Nuclear & Plasma Sci Soc, IEEE, Amer Phys Soc Div Phys Beams, US DOE, Natl Sci Fdn, Off Naval Res AB The mechanical stability of the Advanced Light Source storage ring is examined over a period of 1.5 years from the point of view of floor motion. The storage ring beam position monitor stability is examined under various operating conditions. C1 Lawrence Berkeley Lab, Berkeley, CA 94720 USA. RP Krebs, GF (reprint author), Lawrence Berkeley 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 0-7803-4376-X PY 1998 BP 793 EP 795 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Nuclear; Physics, Particles & Fields SC Engineering; Physics GA BM71G UT WOS:000079582800250 ER EF