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953 results on '"Sangster, T C"'

354. Diagnostic use of secondary proton spectra for D2-filled inertial confinement fusion targets (abstract)

Author

Séguin, F. H., primary, Li, C. K., additional, Hicks, D. G., additional, Frenje, J. A., additional, Petrasso, R. D., additional, Soures, J. M., additional, Glebov, V. Yu., additional, Stoeckl, C., additional, Radha, P. B., additional, Meyerhofer, D. D., additional, Roberts, S., additional, Sorce, C., additional, Sangster, T. C., additional, Cable, M. D., additional, Padalino, S., additional, and Fletcher, K., additional

Published
2001
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355. Measuring fusion yields, areal densities, and ion temperatures of imploded capsules at OMEGA (abstract)

Author

Li, C. K., primary, Hicks, D. G., additional, Séguin, F. H., additional, Frenje, J., additional, Petrasso, R. D., additional, Soures, J. M., additional, Radha, P. B., additional, Glebov, V. Yu., additional, Stoeckl, C., additional, Knauer, J. P., additional, Marshall, F. J., additional, Meyerhofer, D. D., additional, Skupsky, S., additional, Roberts, S., additional, Sorce, C., additional, Sangster, T. C., additional, Phillips, T. W., additional, and Cable, M. D., additional

Published
2001
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356. A neutron spectrometer for precise measurements of DT neutrons from 10 to 18 MeV at OMEGA and the National Ignition Facility

Author

Frenje, J. A., primary, Green, K. M., additional, Hicks, D. G., additional, Li, C. K., additional, Séguin, F. H., additional, Petrasso, R. D., additional, Sangster, T. C., additional, Phillips, T. W., additional, Glebov, V. Yu., additional, Meyerhofer, D. D., additional, Roberts, S., additional, Soures, J. M., additional, Stoeckl, C., additional, Fletcher, K., additional, Padalino, S., additional, and Leeper, R. J., additional

Published
2001
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357. The National Ignition Facility Diagnostic Set at the Completion of the National Ignition Campaign, September 2012

Author

Kilkenny, J. D., Bell, P. M., Bradley, D. K., Bleuel, D. L., Caggiano, J. A., Dewald, E. L., Hsing, W. W., Kalantar, D. H., Kauffman, R. L., Larson, D. J., Moody, J. D., Schneider, D. H., Schneider, M. B., Shaughnessy, D. A., Shelton, R. T., Stoeffl, W., Widmann, K., Yeamans, C. B., Batha, S. H., Grim, G. P., Herrmann, H. W., Merrill, F. E., Leeper, R. J., Oertel, J. A., Sangster, T. C., Edgell, D. H., Hohenberger, M., Glebov, V. Yu., Regan, S. P., Frenje, J. A., Gatu-Johnson, M., Petrasso, R. D., Rinderknecht, H. G., Zylstra, A. B., Cooper, G. W., and Ruizf, C.

Abstract

AbstractAt the completion of the National Ignition Campaign (NIC), the National Ignition Facility (NIF) had about 36 different types of diagnostics. These were based on several decades of development on Nova and OMEGA and involved the whole U.S. inertial confinement fusion community. In 1994, the Joint Central Diagnostic Team documented a plan for a limited set of NIF diagnostics in the NIF Conceptual Design Report. Two decades later, these diagnostics, and many others, were installed workhorse tools for all users of NIF. We give a short description of each of the 36 different types of NIC diagnostics grouped by the function of the diagnostics, namely, target drive, target response and target assembly, stagnation, and burn. A comparison of NIF diagnostics with the Nova diagnostics shows that the NIF diagnostic capability is broadly equivalent to that of Nova in 1999. Although NIF diagnostics have a much greater degree of automation and rigor than Nova’s, new diagnostics are limited such as the higher-speed X-ray imager. Recommendations for future diagnostics on the NIF are discussed.

Published
2016
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358. Charged-particle acceleration and energy loss in laser-produced plasmas

Author

Hicks, D. G., primary, Li, C. K., additional, Séguin, F. H., additional, Ram, A. K., additional, Frenje, J. A., additional, Petrasso, R. D., additional, Soures, J. M., additional, Glebov, V. Yu., additional, Meyerhofer, D. D., additional, Roberts, S., additional, Sorce, C., additional, Stöckl, C., additional, Sangster, T. C., additional, and Phillips, T. W., additional

Published
2000
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359. Intense High-Energy Proton Beams from Petawatt-Laser Irradiation of Solids

Author

Snavely, R. A., primary, Key, M. H., additional, Hatchett, S. P., additional, Cowan, T. E., additional, Roth, M., additional, Phillips, T. W., additional, Stoyer, M. A., additional, Henry, E. A., additional, Sangster, T. C., additional, Singh, M. S., additional, Wilks, S. C., additional, MacKinnon, A., additional, Offenberger, A., additional, Pennington, D. M., additional, Yasuike, K., additional, Langdon, A. B., additional, Lasinski, B. F., additional, Johnson, J., additional, Perry, M. D., additional, and Campbell, E. M., additional

Published
2000
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360. D – 3 He proton spectra for diagnosing shell ρR and fuel Ti of imploded capsules at OMEGA

Author

Li, C. K., primary, Hicks, D. G., additional, Séguin, F. H., additional, Frenje, J. A., additional, Petrasso, R. D., additional, Soures, J. M., additional, Radha, P. B., additional, Glebov, V. Yu., additional, Stoeckl, C., additional, Harding, D. R., additional, Knauer, J. P., additional, Kremens, R., additional, Marshall, F. J., additional, Meyerhofer, D. D., additional, Skupsky, S., additional, Roberts, S., additional, Sorce, C., additional, Sangster, T. C., additional, Phillips, T. W., additional, Cable, M. D., additional, and Leeper, R. J., additional

Published
2000
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361. Soft x-ray backlighting of cryogenic implosions using a narrowband crystal imaging system (invited).

Author

Stoeckl, C., Bedzyk, M., Brent, G., Epstein, R., Fiksel, G., Guy, D., Goncharov, V. N., Hu, S. X., Ingraham, S., Jacobs-Perkins, D. W., Jungquist, R. K., Marshall, F. J., Mileham, C., Nilson, P. M., Sangster, T. C., Shoup III, M. J., and Theobald, W.

Subjects
IMAGING system equipment, CRYOGENICS, X-rays, SCIENTIFIC apparatus & instruments, PHYSICS instruments
Abstract

A high-performance cryogenic DT inertial confinement fusion implosion experiment is an especially challenging backlighting configuration because of the high self-emission of the core at stagnation and the low opacity of the DT shell. High-energy petawatt lasers such as OMEGA EP promise significantly improved backlighting capabilities by generating high x-ray intensities and short emission times. A narrowband x-ray imager with an astigmatism-corrected bent quartz crystal for the Si Heα line at ~1.86 keV was developed to record backlit images of cryogenic direct-drive implosions. A time-gated recording system minimized the self-emission of the imploding target. A fast target-insertion system capable of moving the backlighter target ~7c mi n ~100 ms was developed to avoid interference with the cryogenic shroud system. With backlighter laser energies of ~1.25 kJ at a 10-ps pulse duration, the radiographic images show a high signal-to-background ratio of >100:1 and a spatial resolution of the order of 10 µm. The backlit images can be used to assess the symmetry of the implosions close to stagnation and the mix of ablator material into the dense shell. [ABSTRACT FROM AUTHOR]

Published
2014
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362. Measurements of fuel and ablator ρR in Symmetry-Capsule implosions with the Magnetic Recoil neutron Spectrometer (MRS) on the National Ignition Facility.

Author

Johnson, M. Gatu, Frenje, J. A., K. Li, C., Séguin, F. H., Petrasso, R. D., Bionta, R. M., Casey, D. T., Caggiano, J. A., Hatarik, R., Khater, H. Y., Sayre, D. B., Knauer, J. P., Sangster, T. C., Herrmann, H. W., and Kilkenny, J. D.

Subjects
NEUTRON spectroscopy, NEUTRON spectrometers, NEUTRON temperature, PLASMA gas research, PLASMA spectroscopy
Abstract

The Magnetic Recoil neutron Spectrometer (MRS) on the National Ignition Facility (NIF) measures the neutron spectrum in the energy range of 4-20 MeV. This paper describes MRS measurements of DT-fuel and CH-ablator ρR in DT gas-filled symmetry-capsule implosions at the NIF. DT-fuel ρ ρR's of 80-140 mg/cm and CH-ablator ρR's of 400-680 mg/cm are inferred from MRS data. The measurements were facilitated by an improved correction of neutron-induced background in the low-energy part of the MRS spectrum. This work demonstrates the accurate utilization of the complete MRS-measured neutron spectrum for diagnosing NIF DT implosions. [ABSTRACT FROM AUTHOR]

Published
2014
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363. A compact proton spectrometer for measurement of the absolute DD proton spectrum from which yield and ρR are determined in thin-shell inertial-confinement-fusion implosions.

Author

Rosenberg, M. J., Zylstra, A. B., Frenje, J. A., Rinderknecht, H. G., Johnson, M. Gatu, Waugh, C. J., Séguin, F. H., Sio, H., Sinenian, N., Li, C. K., Petrasso, R. D., Glebov, V. Yu., Hohenberger, M., Stoeckl, C., Sangster, T. C., Yeamans, C. B., LePape, S., Mackinnon, A. J., Bionta, R. M., and Talison, B.

Subjects
SPECTROMETRY, PROTONS, INERTIAL confinement fusion, FUSION (Phase transformation), SCIENTIFIC apparatus & instruments
Abstract

A compact, step range filter proton spectrometer has been developed for the measurement of the absolute DD proton spectrum, from which yield and areal density (ρR) are inferred for deuterium-filled thin-shell inertial confinement fusion implosions. This spectrometer, which is based on tantalum step-range filters, is sensitive to protons in the energy range 1-9 MeV and can be used to measure proton spectra at mean energies of ~ 1-3 MeV. It has been developed and implemented using a linear accelerator and applied to experiments at the OMEGA laser facility and the National Ignition Facility (NIF). Modeling of the proton slowing in the filters is necessary to construct the spectrum, and the yield and energy uncertainties are ±<10% in yield and ±120keV, respectively. This spectrometer can be used for in situ calibration of DD-neutron yield diagnostics at the NIF. [ABSTRACT FROM AUTHOR]

Published
2014
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364. A compact neutron spectrometer for characterizing inertial confinement fusion implosions at OMEGA and the NIF.

Author

Zylstra, A. B., Johnson, M. Gatu, Frenje, J. A., Séguin, F. H., Rinderknecht, H. G., Rosenberg, M. J., Sio, H. W., Li, C. K., Petrasso, R. D., McCluskey, M., Mastrosimone, D., Glebov, V. Yu., Forrest, C., Stoeckl, C., and Sangster, T. C.

Subjects
NEUTRON spectrometers, DEUTERIUM, TRITIUM, PROTON measurements, FUEL, NEUTRON temperature
Abstract

A compact spectrometer for measurements of the primary deuterium-tritium neutron spectrum has been designed and implemented on the OMEGA laser facility [T. Boehly et al., Opt. Commun. 133, 495 (1997)]. This instrument uses the recoil spectrometry technique, where neutrons produced in an implosion elastically scatter protons in a plastic foil, which are subsequently detected by a proton spectrometer. This diagnostic is currently capable of measuring the yield to ~±10% accuracy, and mean neutron energy to ~±50 keV precision. As these compact spectrometers can be readily placed at several locations around an implosion, effects of residual fuel bulk flows during burn can be measured. Future improvements to reduce the neutron energy uncertainty to ±15-20 keV are discussed, which will enable measurements of fuel velocities to an accuracy of ~±25-40 km/s. [ABSTRACT FROM AUTHOR]

Published
2014
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365. Improving the hot-spot pressure and demonstrating ignition hydrodynamic equivalence in cryogenic deuterium-tritium implosions on OMEGA.

Author

Goncharov, V. N., Sangster, T. C., Betti, R., Boehly, T. R., Bonino, M. J., Collins, T. J. B., Craxton, R. S., Delettrez, J. A., Edgell, D. H., Epstein, R., Follett, R. K., Forrest, C. J., Froula, D. H., Glebov, V. Yu., Harding, D. R., Henchen, R. J., Hu, S. X., Igumenshchev, I. V., Janezic, R., and Kelly, J. H.

Subjects
*HYDRODYNAMICS, *LASERS, *SIMULATION methods & models, *ROBUST control
Abstract

Reaching ignition in direct-drive (DD) inertial confinement fusion implosions requires achieving central pressures in excess of 100 Gbar. The OMEGA laser system [T. R. Boehly et al., Opt. Commun. 133, 495 (1997)] is used to study the physics of implosions that are hydrodynamically equivalent to the ignition designs on the National Ignition Facility (NIF) [J. A. Paisner et al., Laser Focus World 30, 75 (1994)]. It is shown that the highest hot-spot pressures (up to 40 Gbar) are achieved in target designs with a fuel adiabat of α~- 4, an implosion velocity of 3.8 × 107 cm/s, and a laser intensity of ~1015 W/cm2. These moderate-adiabat implosions are well understood using two-dimensional hydrocode simulations. The performance of lower-adiabat implosions is significantly degraded relative to code predictions, a common feature between DD implosions on OMEGA and indirect-drive cryogenic implosions on the NIF. Simplified theoretical models are developed to gain physical understanding of the implosion dynamics that dictate the target performance. These models indicate that degradations in the shell density and integrity (caused by hydrodynamic instabilities during the target acceleration) coupled with hydrodynamics at stagnation are the main failure mechanisms in low-adiabat designs. To demonstrate ignition hydrodynamic equivalence in cryogenic implosions on OMEGA, the target-design robustness to hydrodynamic instability growth must be improved by reducing laser-coupling losses caused by cross beam energy transfer. [ABSTRACT FROM AUTHOR]

Published
2014
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366. Theory of hydro-equivalent ignition for inertial fusion and its applications to OMEGA and the National Ignition Facility.

Author

Nora, R., Betti, R., Anderson, K. S., Shvydky, A., Bose, A., Woo, K. M., Christopherson, A. R., Marozas, J. A., Collins, T. J. B., Radha, P. B., Hu, S. X., Epstein, R., Marshall, F. J., McCrory, R. L., Sangster, T. C., and Meyerhofer, D. D.

Subjects
PLASMA devices, HYDRODYNAMICS, SIMULATION methods & models, LASERS
Abstract

The theory of ignition for inertial confinement fusion capsules [R. Betti et al., Phys. Plasmas 17, 058102 (2010)] is used to assess the performance requirements for cryogenic implosion experiments on the Omega Laser Facility. The theory of hydrodynamic similarity is developed in both one and two dimensions and tested using multimode hydrodynamic simulations with the hydrocode DRACO [P. B. Radha et al., Phys. Plasmas 12, 032702 (2005)] of hydro-equivalent implosions (implosions with the same implosion velocity, adiabat, and laser intensity). The theory is used to scale the performance of direct-drive OMEGA implosions to the National Ignition Facility (NIF) energy scales and determine the requirements for demonstrating hydro-equivalent ignition on OMEGA. Hydro-equivalent ignition on OMEGA is represented by a cryogenic implosion that would scale to ignition on the NIF at 1.8MJ of laser energy symmetrically illuminating the target. It is found that a reasonable combination of neutron yield and areal density for OMEGA hydro-equivalent ignition is 3 to 6 × 1013 and ~0.3 g/cm2, respectively, depending on the level of laser imprinting. This performance has not yet been achieved on OMEGA. [ABSTRACT FROM AUTHOR]

Published
2014
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367. Kinetic mix mechanisms in shock-driven inertial confinement fusion implosions.

Author

Rinderknecht, H. G., Sio, H., Li, C. K., Hoffman, N., Zylstra, A. B., Rosenberg, M. J., Frenje, J. A., Johnson, M. Gatu, Séguin, F. H., Petrasso, R. D., Betti, R., Yu Glebov, V., Meyerhofer, D. D., Sangster, T. C., Seka, W., Stoeckl, C., Kagan, G., Molvig, K., Bellei, C., and Amendt, P.

Subjects
PLASMA devices, DEUTERIUM, DEUTERONS, LASER beams, SIMULATION methods & models
Abstract

Shock-driven implosions of thin-shell capsules, or "exploding pushers," generate low-density, high-temperature plasmas in which hydrodynamic instability growth is negligible and kinetic effects can play an important role. Data from implosions of thin deuterated-plastic shells with hydroequivalent D3He gas fills ranging from pure deuterium to pure 3He [H. G. Rinderknecht et al., Phys. Rev. Lett. 112, 135001 (2014)] were obtained to evaluate non-hydrodynamic fuel-shell mix mechanisms. Simulations of the experiments including reduced ion kinetic models support ion diffusion as an explanation for these data. Several additional kinetic mechanisms are investigated and compared to the data to determine which are important in the experiments. Shock acceleration of shell deuterons is estimated to introduce mix less than or comparable to the amount required to explain the data. Beam-target mechanisms are found to produce yields at most an order of magnitude less than the observations. [ABSTRACT FROM AUTHOR]

Published
2014
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368. Empirical assessment of the detection efficiency of CR-39 at high proton fluence and a compact, proton detector for high-fluence applications.

Author

Rosenberg, M. J., Séguin, F. H., Waugh, C. J., Rinderknecht, H. G., Orozco, D., Frenje, J. A., Johnson, M. Gatu, Sio, H., Zylstra, A. B., Sinenian, N., K. Li, C., Petrasso, R. D., Glebov, V. Yu., Stoeck, C., Hohenberger, M., Sangster, T. C., LePape, S., Mackinnon, A. J., Bionta, R. M., and Landen, O. L.

Subjects
NUCLEAR track detectors, PARTICLE tracks (Nuclear physics), INERTIAL confinement fusion, PROTONS, NUCLEAR counters
Abstract

CR-39 solid-state nuclear track detectors are widely used in physics and in many inertial confinement fusion (ICF) experiments, and under ideal conditions these detectors have 100% detection efficiency for ~0.5-8 MeV protons. When the fluence of incident particles becomes too high, overlap of particle tracks leads to under-counting at typical processing conditions (5 h etch in 6N NaOH at 80 °C). Short etch times required to avoid overlap can cause under-counting as well, as tracks are not fully developed. Experiments have determined the minimum etch times for 100% detection of 1.7-4.3-MeV protons and established that for 2.4-MeV protons, relevant for detection of DD protons, the maximum fluence that can be detected using normal processing techniques is ≲3 x 106 cm-2. A CR-39-based proton detector has been developed to mitigate issues related to high particle fluences on ICF facilities. Using a pinhole and scattering foil several mm in front of the CR-39, proton fluences at the CR-39 are reduced by more than a factor of ~50, increasing the operating yield upper limit by a comparable amount. [ABSTRACT FROM AUTHOR]

Published
2014
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369. Shock-ignition relevant experiments with planar targets on OMEGA.

Author

Hohenberger, M., Theobald, W., Hu, S. X., Anderson, K. S., Betti, R., Boehly, T. R., Casner, A., Fratanduono, D. E., Lafon, M., Meyerhofer, D. D., Nora, R., Ribeyre, X., Sangster, T. C., Schurtz, G., Seka, W., Stoeckl, C., and Yaakobi, B.

Subjects
ELECTRON beams, PLASMA gases, ELECTRON temperature, QUANTUM theory, THERMAL properties of condensed matter, SIMULATION methods & models
Abstract

We report on laser-driven, strong-shock generation and hot-electron production in planar targets in the presence of a pre-plasma at shock-ignition (SI) relevant laser and pre-plasma conditions. 2-D simulations reproduce the shock dynamics well, indicating ablator shocks of up to 75 Mbar have been generated. We observe hot-electron temperatures of ~70 keV at intensities of 1.4X1015 W/cm² with multiple overlapping beams driving the two-plasmon decay instability. When extrapolated to SI-relevant intensities of ~1016 W/cm², the hot electron temperature will likely exceed 100 keV, suggesting that tightly focused beams without overlap are better suited for launching the ignitor shock. [ABSTRACT FROM AUTHOR]

Published
2014
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370. Proton and deuteron production in Au+Au reactions at11.6A GeV/c

Author

Ahle, L., primary, Akiba, Y., additional, Ashktorab, K., additional, Baker, M. D., additional, Beavis, D., additional, Britt, H. C., additional, Chang, J., additional, Chasman, C., additional, Chen, Z., additional, Chi, C.-Y., additional, Chu, Y. Y., additional, Cianciolo, V., additional, Cole, B. A., additional, Crawford, H. J., additional, Cumming, J. B., additional, Debbe, R., additional, Dunlop, J. C., additional, Eldredge, W., additional, Engelage, J., additional, Fung, S.-Y., additional, Garcia, E., additional, Gushue, S., additional, Hamagaki, H., additional, Hansen, L. F., additional, Hayano, R. S., additional, Heintzelman, G., additional, Judd, E., additional, Kang, J., additional, Kim, E.-J., additional, Kumagai, A., additional, Kurita, K., additional, Lee, J.-H., additional, Luke, J., additional, Miake, Y., additional, Mignerey, A., additional, Moskowitz, B., additional, Moulson, M., additional, Muentz, C., additional, Nagamiya, S., additional, Namboodiri, M. N., additional, Ogilvie, C. A., additional, Olness, J., additional, Remsberg, L. P., additional, Sako, H., additional, Sangster, T. C., additional, Seto, R., additional, Shea, J., additional, Shigaki, K., additional, Soltz, R., additional, Steadman, S. G., additional, Stephans, G. S. F., additional, Tannenbaum, M. J., additional, Thomas, J. H., additional, Ueno-Hayashi, S., additional, Videbæk, F., additional, Wang, F., additional, Wu, Y., additional, Xiang, H., additional, Xu, G. H., additional, Yagi, K., additional, Yao, H., additional, Zajc, W. A., additional, and Zhu, F., additional

Published
1999
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371. Centrality dependence of kaon yields inSi+Aand Au+Au collisions at relativistic energies

Author

Ahle, L., primary, Akiba, Y., additional, Ashktorab, K., additional, Baker, M., additional, Beavis, D., additional, Beery, P., additional, Britt, H. C., additional, Budick, B., additional, Chang, J., additional, Chasman, C., additional, Chen, Z., additional, Chi, C. Y., additional, Chu, Y. Y., additional, Cianciolo, V., additional, Cole, B. A., additional, Costales, J. B., additional, Crawford, H. J., additional, Cumming, J. B., additional, Debbe, R., additional, Dunlop, J. C., additional, Eldredge, W., additional, Engelage, J., additional, Fung, S. Y., additional, Gaardhoje, J., additional, Gonin, M., additional, Gushue, S., additional, Hamagaki, H., additional, Hansen, A., additional, Hansen, L., additional, Hansen, O., additional, Hayano, R. S., additional, Hayashi, S., additional, Heintzelman, G., additional, Homma, S., additional, Judd, E., additional, Kaneko, H., additional, Kang, J., additional, Kaufman, S., additional, Kehoe, W. L., additional, Kumagai, A., additional, Kurita, K., additional, Ledoux, R. J., additional, LeVine, M. J., additional, Luke, J., additional, Miake, Y., additional, Morrison, D. P., additional, Morse, R. J., additional, Moskowitz, B., additional, Moulson, M., additional, Nagamiya, S., additional, Namboodiri, M. N., additional, Nayak, T. K., additional, Ogilvie, C. A., additional, Olness, J., additional, Parsons, C. G., additional, Remsberg, L. P., additional, Roehrich, D., additional, Rothschild, P., additional, Sako, H., additional, Sakurai, H., additional, Sangster, T. C., additional, Seto, R., additional, Shigaki, K., additional, Soltz, R., additional, Stankus, P., additional, Steadman, S. G., additional, Stephans, G. S. F., additional, Sung, T. W., additional, Tanaka, Y., additional, Tannenbaum, M. J., additional, Thomas, J. H., additional, Tonse, S. R., additional, Ueno-Hayashi, S., additional, van Dijk, J. H., additional, Videbæk, F., additional, Vossnack, O., additional, Vutsadakis, V., additional, Wang, F., additional, Wang, Y., additional, Wegner, H. E., additional, Woodruff, D., additional, Wu, Y., additional, Xu, G. H., additional, Yagi, K., additional, Yang, X., additional, Zachary, D., additional, Zajc, W. A., additional, Zhu, F., additional, and Zhu, Q., additional

Published
1999
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372. Simultaneous multiplicity and forward energy characterization of particle spectra in Au+Au collisions at11.6AGeV/c

Author

Ahle, L., primary, Akiba, Y., additional, Ashktorab, K., additional, Baker, M. D., additional, Beavis, D., additional, Britt, H. C., additional, Chang, J., additional, Chasman, C., additional, Chen, Z., additional, Chi, C.-Y., additional, Chu, Y. Y., additional, Cianciolo, V., additional, Cole, B. A., additional, Crawford, H. J., additional, Cumming, J. B., additional, Debbe, R., additional, Dunlop, J. C., additional, Eldredge, W., additional, Engelage, J., additional, Fung, S.-Y., additional, Garcia, E., additional, Gushue, S., additional, Hamagaki, H., additional, Hansen, L. F., additional, Hayano, R. S., additional, Heintzelman, G., additional, Judd, E., additional, Kang, J., additional, Kim, E.-J., additional, Kumagai, A., additional, Kurita, K., additional, Lee, J.-H., additional, Luke, J., additional, Miake, Y., additional, Mignerey, A., additional, Moskowitz, B., additional, Moulson, M., additional, Muentz, C., additional, Nagamiya, S., additional, Namboodiri, M. N., additional, Ogilvie, C. A., additional, Olness, J., additional, Remsberg, L. P., additional, Sako, H., additional, Sangster, T. C., additional, Seto, R., additional, Shea, J., additional, Shigaki, K., additional, Soltz, R., additional, Steadman, S. G., additional, Stephans, G. S. F., additional, Tannenbaum, M. J., additional, Thomas, J. H., additional, Ueno-Hayashi, S., additional, Videbaek, F., additional, Wang, F., additional, Wu, Y., additional, Xiang, H., additional, Xu, G. H., additional, Yagi, K., additional, Yao, H., additional, Zajc, W. A., additional, and Zhu, F., additional

Published
1999
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375. Kaon production in Au+Au collisions at11.6A GeV/c

Author

Ahle, L., primary, Akiba, Y., additional, Ashktorab, K., additional, Baker, M. D., additional, Beavis, D., additional, Britt, H. C., additional, Chang, J., additional, Chasman, C., additional, Chen, Z., additional, Chi, C.-Y., additional, Chu, Y. Y., additional, Cianciolo, V., additional, Cole, B. A., additional, Crawford, H. J., additional, Cumming, J. B., additional, Debbe, R., additional, Dunlop, J. C., additional, Eldredge, W., additional, Engelage, J., additional, Fung, S.-Y., additional, Garcia, E., additional, Gushue, S., additional, Hamagaki, H., additional, Hansen, L. F., additional, Hayano, R. S., additional, Heintzelman, G., additional, Judd, E., additional, Kang, J., additional, Kim, E.-J., additional, Kumagai, A., additional, Kurita, K., additional, Lee, J.-H., additional, Luke, J., additional, Miake, Y., additional, Mignerey, A., additional, Moskowitz, B., additional, Moulson, M., additional, Muentz, C., additional, Nagamiya, S., additional, Namboodiri, M. N., additional, Ogilvie, C. A., additional, Olness, J., additional, Remsberg, L. P., additional, Sako, H., additional, Sangster, T. C., additional, Seto, R., additional, Shea, J., additional, Shigaki, K., additional, Soltz, R., additional, Steadman, S. G., additional, Stephans, G. S. F., additional, Tannenbaum, M. J., additional, Thomas, J. H., additional, Ueno-Hayashi, S., additional, Videbaek, F., additional, Wang, F., additional, Wu, Y., additional, Xiang, H., additional, Xu, G. H., additional, Yagi, K., additional, Yao, H., additional, Zajc, W. A., additional, and Zhu, F., additional

Published
1998
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376. Antiproton Production inAu+AuCollisions at11.7AGeV/c

Author

Ahle, L., primary, Akiba, Y., additional, Ashktorab, K., additional, Baker, M. D., additional, Beavis, D., additional, Britt, H. C., additional, Chang, J., additional, Chasman, C., additional, Chen, Z., additional, Chi, C.-Y., additional, Chu, Y. Y., additional, Cianciolo, V., additional, Cole, B. A., additional, Crawford, H. J., additional, Cumming, J. B., additional, Debbe, R., additional, Dunlop, J. C., additional, Eldredge, W., additional, Engelage, J., additional, Fung, S.-Y., additional, Garcia, E., additional, Gushue, S., additional, Hamagaki, H., additional, Hansen, L. F., additional, Hayano, R. S., additional, Heintzelman, G., additional, Judd, E., additional, Kang, J., additional, Kim, E.-J., additional, Kumagai, A., additional, Kurita, K., additional, Lee, J.-H., additional, Luke, J., additional, Miake, Y., additional, Mignerey, A., additional, Moskowitz, B., additional, Moulson, M., additional, Muentz, C., additional, Nagamiya, S., additional, Namboodiri, M. N., additional, Ogilvie, C. A., additional, Olness, J., additional, Remsberg, L. P., additional, Sako, H., additional, Sangster, T. C., additional, Seto, R., additional, Shea, J., additional, Shigaki, K., additional, Soltz, R., additional, Steadman, S. G., additional, Stephans, G. S. F., additional, Tannenbaum, M. J., additional, Thomas, J. H., additional, Ueno-Hayashi, S., additional, Videbaek, F., additional, Wang, F., additional, Wu, Y., additional, Xiang, H., additional, Xu, G. H., additional, Yagi, K., additional, Yao, H., additional, Zajc, W. A., additional, and Zhu, F., additional

Published
1998
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377. Hot electron production and heating by hot electrons in fast ignitor research

Author

Key, M. H., primary, Cable, M. D., additional, Cowan, T. E., additional, Estabrook, K. G., additional, Hammel, B. A., additional, Hatchett, S. P., additional, Henry, E. A., additional, Hinkel, D. E., additional, Kilkenny, J. D., additional, Koch, J. A., additional, Kruer, W. L., additional, Langdon, A. B., additional, Lasinski, B. F., additional, Lee, R. W., additional, MacGowan, B. J., additional, MacKinnon, A., additional, Moody, J. D., additional, Moran, M. J., additional, Offenberger, A. A., additional, Pennington, D. M., additional, Perry, M. D., additional, Phillips, T. J., additional, Sangster, T. C., additional, Singh, M. S., additional, Stoyer, M. A., additional, Tabak, M., additional, Tietbohl, G. L., additional, Tsukamoto, M., additional, Wharton, K., additional, and Wilks, S. C., additional

Published
1998
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378. Proton, deuteron, and triton emission at target rapidity in Au+Au collisions at10.20AGeV: Spectra and directed flow

Author

Ahle, L., primary, Akiba, Y., additional, Ashktorab, K., additional, Baker, M. D., additional, Beavis, D., additional, Britt, H. C., additional, Chang, J., additional, Chasman, C., additional, Chen, Z., additional, Chi, C.-Y., additional, Chu, Y. Y., additional, Cianciolo, V., additional, Cole, B. A., additional, Crawford, H. J., additional, Cumming, J. B., additional, Debbe, R., additional, Eldredge, W., additional, Engelage, J., additional, Fung, S. Y., additional, Gaardhoje, J. J., additional, Gonin, M., additional, Gushue, S., additional, Hamagaki, H., additional, Hansen, A. G., additional, Hansen, L., additional, Heintzelman, G., additional, Homma, S., additional, Hayano, R. S., additional, Judd, E., additional, Kang, J. H., additional, Kaneko, H., additional, Kumagai, A., additional, Kurita, K., additional, Levine, M., additional, Luke, J., additional, Miake, Y., additional, Moskowitz, B., additional, Moulson, M., additional, Nagamiya, S., additional, Namboodiri, M. N., additional, Nayak, T. K., additional, Ogilvie, C. A., additional, Olness, J., additional, Remsberg, L. P., additional, Sangster, T. C., additional, Seto, R., additional, Shigaki, K., additional, Sako, H., additional, Soltz, R., additional, Steadman, S. G., additional, Stephans, G. S. F., additional, Sung, T., additional, Tannenbaum, M. J., additional, Thomas, J. H., additional, Tonse, S. R., additional, Ueno-Hayashi, S., additional, Videbæk, F., additional, Wang, F. Q., additional, Wang, Y., additional, Woodruff, D. S., additional, Wu, Y., additional, Xu, G., additional, Yagi, K., additional, Zachary, D., additional, Zajc, W. A., additional, Zhu, F., additional, and Zhu, Q., additional

Published
1998
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379. Particle production at high baryon density in central Au+Au reactions at 11.6AGeV/c

Author

Ahle, L., primary, Akiba, Y., additional, Ashktorab, K., additional, Baker, M. D., additional, Beavis, D., additional, Britt, H. C., additional, Chang, J., additional, Chasman, C., additional, Chen, Z., additional, Chi, C.-Y., additional, Chu, Y. Y., additional, Cianciolo, V., additional, Cole, B. A., additional, Crawford, H. J., additional, Cumming, J. B., additional, Debbe, R., additional, Dunlop, J. C., additional, Eldredge, W., additional, Engelage, J., additional, Fung, S.-Y., additional, Gaardhoje, J. J., additional, Garcia, E., additional, Gonin, M., additional, Gushue, S., additional, Hamagaki, H., additional, Hansen, A., additional, Hansen, L., additional, Hayano, R. S., additional, Heintzelman, G., additional, Homma, S., additional, Judd, E., additional, Kaneko, H., additional, Kang, J., additional, Kim, E.-J., additional, Kumagai, A., additional, Kurita, K., additional, Lee, J.-H., additional, Levine, M. J., additional, Luke, J., additional, Miake, Y., additional, Mignerey, A., additional, Morrison, D., additional, Moskowitz, B., additional, Moulson, M., additional, Muentz, C., additional, Nagamiya, S., additional, Namboodiri, M. N., additional, Ogilvie, C. A., additional, Olness, J., additional, Park, S., additional, Remsberg, L. P., additional, Rothschild, P., additional, Sako, H., additional, Sangster, T. C., additional, Seto, R., additional, Shea, J., additional, Shigaki, K., additional, Soltz, R., additional, Steadman, S. G., additional, Stephans, G. S. F., additional, Sung, T., additional, Tannenbaum, M. J., additional, Thomas, J. H., additional, Tonse, S., additional, Ueno-Hayashi, S., additional, Videbæk, F., additional, Wang, F., additional, Wang, Y., additional, Wu, Y., additional, Xiang, H., additional, Xu, G. H., additional, Yagi, K., additional, Zachary, D., additional, Zajc, W. A., additional, Zhu, F., additional, and Zhu, Q., additional

Published
1998
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380. Atomic and nuclear processes produced in ultra-high intensity laser irradiation of solid targets

Author

Key, M. H., primary, Cable, M. D., additional, Cowan, T. E., additional, Estabrook, K. G., additional, Hammel, B. A., additional, Hatchett, S. P., additional, Henry, E. A., additional, Hinkel, D. E., additional, Kilkenny, J. D., additional, Koch, J. A., additional, Kruer, W. L., additional, Langdon, A. B., additional, Lasinski, B. F., additional, Lee, R. W., additional, MacGowan, B. J., additional, MacKinnon, A., additional, Moody, J. D., additional, Moran, M. J., additional, Offenberger, A. A., additional, Pennington, D. M., additional, Perry, M. D., additional, Phillips, T. J., additional, Sangster, T. C., additional, Singh, M. S., additional, Stoyer, M. A., additional, Tabak, M., additional, Tietbohl, G. L., additional, Tsukamoto, M., additional, Wharton, K., additional, and Wilks, S. C., additional

Published
1998
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381. Two-particle rapidity correlations from the Bose-Einstein effect in central28Si+Au collisions at14.6AGeV/cand intermittency

Author

Akiba, Y., primary, Beavis, D., additional, Beery, P., additional, Britt, H. C., additional, Budick, B., additional, Chasman, C., additional, Chen, Z., additional, Chi, C. Y., additional, Chu, Y. Y., additional, Cianciolo, V., additional, Cole, B. A., additional, Costales, J. B., additional, Crawford, H. J., additional, Cumming, J. B., additional, Debbe, R., additional, Engelage, J., additional, Fung, S. Y., additional, Gonin, M., additional, Gushue, S., additional, Hamagaki, H., additional, Hansen, O., additional, Hayano, R. S., additional, Hayashi, S., additional, Homma, S., additional, Kaneko, H., additional, Kang, J., additional, Kaufman, S., additional, Kehoe, W. L., additional, Kurita, K., additional, Ledoux, R. J., additional, Levine, M. J., additional, Miake, Y., additional, Morrison, D. P., additional, Morse, R. J., additional, Moskowitz, B., additional, Nagamiya, S., additional, Namboodiri, M. N., additional, Nayak, T. K., additional, Olness, J., additional, Parsons, C. G., additional, Remsberg, L. P., additional, Roehrich, D., additional, Rothschild, P., additional, Sakurai, H., additional, Sangster, T. C., additional, Seto, R., additional, Soltz, R., additional, Stankus, P., additional, Steadman, S. G., additional, Stephans, G. S. F., additional, Sung, T., additional, Tanaka, Y., additional, Tannenbaum, M. J., additional, Thomas, J., additional, Tonse, S., additional, van Dijk, J. H., additional, Videbæk, F., additional, Vossnack, O., additional, Vutsadakis, V., additional, Wang, F. Q., additional, Wang, Y., additional, Wegner, H. E., additional, Woodruff, D. S., additional, Wu, Y. D., additional, Yang, X., additional, Zachary, D., additional, and Zajc, W. A., additional

Published
1997
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382. Baryon emission at target rapidities inSi+Al,Cu,Aucollisions at14.6AGeV/candAu+Aucollisions at11.7AGeV/c

Author

Ahle, L., primary, Akiba, Y., additional, Beavis, D., additional, Beery, P., additional, Britt, H. C., additional, Budick, B., additional, Chasman, C., additional, Chen, Z., additional, Chi, C. Y., additional, Chu, Y. Y., additional, Cianciolo, V., additional, Cole, B. A., additional, Costales, J. B., additional, Crawford, H. J., additional, Cumming, J. B., additional, Debbe, R., additional, Engelage, J., additional, Fung, S. Y., additional, Gonin, M., additional, Gushue, S., additional, Hamagaki, H., additional, Hayano, R. S., additional, Hayashi, S., additional, Homma, S., additional, Kaneko, H., additional, Kang, J., additional, Kaufman, S., additional, Kehoe, W. L., additional, Kurita, K., additional, Ledoux, R. J., additional, LeVine, M. J., additional, Miake, Y., additional, Morrison, D. P., additional, Morse, R. J., additional, Moskowitz, B., additional, Nagamiya, S., additional, Namboodiri, M. N., additional, Nayak, T. K., additional, Olness, J., additional, Parsons, C. G., additional, Remsberg, L. P., additional, Roerich, D., additional, Rothschild, P., additional, Sakurai, H., additional, Sangster, T. C., additional, Seto, R., additional, Shigaki, K., additional, Soltz, R., additional, Stankus, P., additional, Steadman, S. G., additional, Stephans, G. S. F., additional, Sung, T., additional, Tanaka, Y., additional, Tannenbaum, M. J., additional, Thomas, J., additional, Tonse, S., additional, Ueno, S., additional, van Dijk, J. H., additional, Videbaek, F., additional, Vossnack, O., additional, Vustadakis, V., additional, Wang, F. Q., additional, Wang, Y., additional, Wegner, H. E., additional, Woodruff, D. S., additional, Wu, Y. D., additional, Yagi, K., additional, Yang, X., additional, Zachary, D., additional, and Zajc, W. A., additional

Published
1997
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384. Hadron Production in Au + Au Collisions at 4 A GeV from AGS-E866

Author

Chujo, Tatsuya, primary, Akiba, Y., additional, Ashktorab, K., additional, Baker, M. D., additional, Beavis, D., additional, Britt, H. C., additional, Chang, J., additional, Chasman, C., additional, Chen, Z., additional, Chi, C.-Y., additional, Chu, Y. Y., additional, Chujo, T., additional, Cianciolo, V., additional, Cole, B. A., additional, Crawford, H. J., additional, Cumming, J. B., additional, Debbe, R., additional, Dunlop, J. C., additional, Eldredge, W., additional, Engelage, J., additional, Fung, S.-Y., additional, Gaardhoje, Gaardhoje, additional, Garcia, E., additional, Gonin, M., additional, Gushue, S., additional, Hamagaki, H., additional, Hansen, A., additional, Hansen, L., additional, Hayano, R. S., additional, Heintzelman, G., additional, Homma, S., additional, Judd, E., additional, Kaneko, H., additional, Kang, J., additional, Kim, E.-J., additional, Kumagai, A., additional, Kurita, K., additional, Lee, J.-H., additional, Levine, M. J., additional, Luke, J., additional, Miake, Y., additional, Mignerey, A., additional, Moskowitz, B., additional, Moulson, M., additional, Müentz, C., additional, Nagamiya, S., additional, Namboodiri, M. N., additional, Ogilvie, C., additional, Olness, J., additional, Remsberg, L. P., additional, Sako, H., additional, Sangster, T. C., additional, Seto, R., additional, Shea, J., additional, Shigaki, K., additional, Soltz, R., additional, Steadman, S. G., additional, Stephans, G. S. F., additional, J.Tannenbaum, M., additional, Thomas, J. H., additional, Ueno-Hayashi, S., additional, k, F. Videbæ, additional, Wang, F., additional, Wang, Y., additional, Wu, Y., additional, Xiang, H., additional, Xu, G. H., additional, Yagi, K., additional, Yao, H., additional, Zajc, W. A., additional, Zhu, Q., additional, and Zhu, F., additional

Published
1997
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385. Production ofφMesons in CentralS28i+A196uCollisions at14.6AGeV/c

Author

Akiba, Y., primary, Beavis, D., additional, Beery, P., additional, Britt, H. C., additional, Budick, B., additional, Chasman, C., additional, Chen, Z., additional, Chi, C. Y., additional, Chu, Y. Y., additional, Cianciolo, V., additional, Cole, B. A., additional, Costales, J. B., additional, Crawford, H. J., additional, Cumming, J. B., additional, Debbe, R., additional, Engelage, J., additional, Fung, S. Y., additional, Gonin, M., additional, Gushue, S., additional, Hamagaki, H., additional, Hansen, O., additional, Hayano, R. S., additional, Hayashi, S., additional, Homma, S., additional, Kaneko, H., additional, Kang, J., additional, Kaufman, S., additional, Kehoe, W. L., additional, Kurita, K., additional, Ledoux, R. J., additional, Levine, M. J., additional, Miake, Y., additional, Morrison, D. P., additional, Morse, R. J., additional, Moskowitz, B., additional, Nagamiya, S., additional, Namboodiri, M. N., additional, Nayak, T. K., additional, Olness, J., additional, Parsons, C. G., additional, Remsberg, L. P., additional, Roehrich, D., additional, Rothschild, P., additional, Sakurai, H., additional, Sangster, T. C., additional, Seto, R., additional, Soltz, R., additional, Stankus, P., additional, Steadman, S. G., additional, Stephans, G. S. F., additional, Sung, T., additional, Tanaka, Y., additional, Tannenbaum, M. J., additional, Thomas, J., additional, Tonse, S., additional, Van Dijk, J. H., additional, Videbæk, F., additional, Vossnack, O., additional, Vutsadakis, V., additional, Wang, F. Q., additional, Wang, Y., additional, Wegner, H. E., additional, Woodruff, D. S., additional, Wu, Y. D., additional, Yang, X., additional, Zachary, D., additional, and Zajc, W. A., additional

Published
1996
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386. Heavy ion fusion experiments at LLNL

Author

Barnard, J. J., primary, Cable, M. D., additional, Callahan, D. A., additional, Deadrick, F. J., additional, Eylon, S., additional, Fessenden, T. J., additional, Friedman, A., additional, Grote, D. P., additional, Holm, K. A., additional, Hopkins, H. A., additional, Judd, D. L., additional, Hanks, R. L., additional, Hawkins, S. A., additional, Kirbie, H. C., additional, Logan, B. G., additional, Lund, S. M., additional, Nattrass, L. A., additional, Longinotti, D., additional, Nelson, M. B., additional, Newton, M. A., additional, Ollis, C. W., additional, Sangster, T. C., additional, and Sharp, W. M., additional

Published
1996
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389. Chromophore Doped Glasses as Scintillator Materials

Author

Smith, C., primary, Borrelli, N. F., additional, Tick, P. A., additional, Smith, D., additional, Weber, M. J., additional, Sangster, T. C., additional, Lee, H. W., additional, Hughes, R. S., additional, Derenzo, S. E., additional, and Moses, W. W., additional

Published
1994
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390. Effects of local defect growth in direct-drive cryogenic implosions on OMEGA.

Author

Igumenshchev, I. V., Goncharov, V. N., Shmayda, W. T., Harding, D. R., Sangster, T. C., and Meyerhofer, D. D.

Subjects
CRYOGENICS, SYMMETRY (Physics), HYDRODYNAMICS, TWO-dimensional models, SIMULATION methods & models, LASERS
Abstract

Spherically symmetric, low-adiabat (adiabat α <= 3) cryogenic direct-drive-implosion experiments on the OMEGA laser [T. R. Boehly et al., Opt. Commun. 133, 495 (1995)] yield less than 10% of the neutrons predicted in one-dimensional hydrodynamic simulations. Two-dimensional hydrodynamic simulations suggest that this performance degradation can be explained assuming perturbations from isolated defects of submicron to tens-of-micron scale on the outer surface or inside the shell of implosion targets. These defects develop during the cryogenic filling process and typically number from several tens up to hundreds for each target covering from about 0.2% to 1% of its surface. The simulations predict that such defects can significantly perturb the implosion and result in the injection of about 1 to 2 μg of the hot ablator (carbon-deuterium) and fuel (deuterium-tritium) materials from the ablation surface into the targets. Both the hot mass injection and perturbations of the shell reduce the final shell convergence ratio and implosion performance. The injected carbon ions radiatively cool the hot spot, reducing the fuel temperature, and further reducing the neutron yield. The negative effect of local defects can be minimized by decreasing the number and size of these defects and/or using more hydrodynamically stable implosion designs with higher shell adiabat. [ABSTRACT FROM AUTHOR]

Published
2013
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391. Improving cryogenic deuterium-tritium implosion performance on OMEGA.

Author

Sangster, T. C., Goncharov, V. N., Betti, R., Radha, P. B., Boehly, T. R., Casey, D. T., Collins, T. J. B., Craxton, R. S., Delettrez, J. A., Edgell, D. H., Epstein, R., Forrest, C. J., Frenje, J. A., Froula, D. H., Gatu-Johnson, M., Glebov, Y. Yu., Harding, D. R., Hohenberger, M., Hu, S. X., and Igumenshchev, I. V.

Subjects
*CRYOGENICS, *DEUTERIUM, *TRITIUM, *HYDRODYNAMICS, *ADIABATIC processes
Abstract

A flexible direct-drive target platform is used to implode cryogenic deuterium-tritium (DT) capsules on the OMEGA laser [Boehly et al., Opt. Commun. 133, 495 (1997)]. The goal of these experiments is to demonstrate ignition hydrodynamically equivalent performance where the laser drive intensity, the implosion velocity, the fuel adiabat, and the in-flight aspect ratio (IFAR) are the same as those for a 1.5-MJ target [Goncharov et al., Phys. Rev. Lett. 104, 165001 (2010)] designed to ignite on the National Ignition Facility [Hogan et al., Nucl. Fusion 41, 567 (2001)]. The results from a series of 29 cryogenic DT implosions are presented. The implosions were designed to span a broad region of design space to study target performance as a function of shell stability (adiabat) and implosion velocity. Ablation-front perturbation growth appears to limit target performance at high implosion velocities. Target outer-surface defects associated with contaminant gases in the DT fuel are identified as the dominant perturbation source at the ablation surface; performance degradation is confirmed by 2D hydrodynamic simulations that include these defects. A trend in the value of the Lawson criterion [Betti et al., Phys. Plasmas 17, 058102 (2010)] for each of the implosions in adiabat-IFAR space suggests the existence of a stability boundary that leads to ablator mixing into the hot spot for the most ignition-equivalent designs. [ABSTRACT FROM AUTHOR]

Published
2013
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392. Polar-drive implosions on OMEGA and the National Ignition Facility.

Author

Radha, P. B., Marshall, F. J., Marozas, J. A., Shvydky, A., Gabalski, I., Boehly, T. R., Collins, T. J. B., Craxton, R. S., Edgell, D. H., Epstein, R., Frenje, J. A., Froula, D. H., Goncharov, V. N., Hohenberger, M., McCrory, R. L., McKenty, P. W., Meyerhofer, D. D., Petrasso, R. D., Sangster, T. C., and Skupsky, S.

Subjects
LASER beams, IRRADIATION, MATERIAL plasticity, ADIABATIC processes, SYMMETRY (Physics)
Abstract

Polar-drive (PD) experiments on the OMEGA [Boehly et al., Opt. Commun. 133, 495 (1997)] laser are described. Continuous pulse shapes, where a low-power foot is followed by a rise to the main pulse, and triple-picket pulse shapes, where three pickets precede the main pulse, are used to irradiate warm plastic shell capsules. Both of these pulse shapes set the target on a low, ignition-relevant adiabat of ∼3.5. The areal density is modeled very well in these implosions indicating that shock timing is well modeled in PD geometry. It is shown that the symmetry can be predictably varied by changing the beam pointings. Symmetry is also well reproduced across the two pulse shapes. Limitations of OMEGA experiments are discussed. Preliminary designs for PD implosion experiments on the NIF, with the goal of addressing ignition-relevant issues for PD, including symmetry are presented. [ABSTRACT FROM AUTHOR]

Published
2013
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393. Surface waves and electron acceleration from high-power, kilojoule-class laser interactions with underdense plasma.

Author

Willingale, L., Thomas, A. G. R., Nilson, P. M., Chen, H., Cobble, J., Craxton, R. S., Maksimchuk, A., Norreys, P. A., Sangster, T. C., Scott, R. H. H., Stoeckl, C., Zulick, C., and Krushelnick, K.

Subjects
LASER pulses, CHANNELING (Physics), ELECTRONS, PLASMA gases, ELECTRON spectroscopy, SURFACE waves (Fluids), SIMULATION methods & models
Abstract

Experiments were performed on the Omega EP laser facility to study laser pulse propagation, channeling phenomena and electron acceleration from high-intensity, high-power laser interactions with underdense plasma. A CH plasma plume was used as the underdense target and the interaction of the laser pulse channeling through the plasma was imaged using proton radiography. High-energy electron spectra were measured for different experimental laser parameters. Structures observed along the channel walls are interpreted as having developed from surface waves, which are likely to serve as an injection mechanism of electrons into the cavitated channel for acceleration via direct laser acceleration mechanisms. Two-dimensional particle-in-cell simulations give good agreement with these channeling and electron acceleration phenomena. [ABSTRACT FROM AUTHOR]

Published
2013
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395. Bose-Einstein correlation of kaons in Si+Au collisions at 14.6AGeV/c

Author

Akiba, Y., primary, Beavis, D., additional, Beery, P., additional, Britt, H. C., additional, Budick, B., additional, Chasman, C., additional, Chen, Z., additional, Chi, C. Y., additional, Chu, Y. Y., additional, Cianciolo, V., additional, Cole, B. A., additional, Costales, J. B., additional, Crawford, H. J., additional, Cumming, J. B., additional, Debbe, R., additional, Engelage, J., additional, Fung, S. Y., additional, Gonin, M., additional, Gushue, S., additional, Hamagaki, H., additional, Hansen, O., additional, Hayano, R. S., additional, Hayashi, S., additional, Homma, S., additional, Kaneko, H., additional, Kang, J., additional, Kaufman, S., additional, Kehoe, W. L., additional, Kurita, K., additional, Ledoux, R. J., additional, Levine, M. J., additional, Miake, Y., additional, Morrison, D. P., additional, Morse, R. J., additional, Moskowitz, B., additional, Nagamiya, S., additional, Namboodiri, M. N., additional, Nayak, T. K., additional, Olness, J., additional, Parsons, C. G., additional, Remsberg, L. P., additional, Roehrich, D., additional, Rothschild, P., additional, Sakurai, H., additional, Sangster, T. C., additional, Seto, R., additional, Soltz, R., additional, Stankus, P., additional, Steadman, S. G., additional, Stephans, G. S. F., additional, Sung, T., additional, Tanaka, Y., additional, Tannenbaum, M. J., additional, Thomas, J., additional, Tonse, S., additional, Van Dijk, J. H., additional, Videbaek, F., additional, Vossnack, O., additional, Vutsadakis, V., additional, Wang, F. Q., additional, Wang, Y., additional, Wegner, H. E., additional, Woodruff, D. S., additional, Wu, Y. D., additional, Yang, X., additional, Zachary, D., additional, and Zajc, W. A., additional

Published
1993
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396. Intermediate mass fragment emission in Fe+Au collisions

Author

Sangster, T. C., primary, Britt, H. C., additional, Fields, D. J., additional, Hansen, L. F., additional, Lanier, R. G., additional, Namboodiri, M. N., additional, Remington, B. A., additional, Webb, M. L., additional, Begemann-Blaich, M., additional, Blaich, T., additional, Fowler, M. M., additional, Wilhelmy, J. B., additional, Chan, Y. D., additional, Dacal, A., additional, Harmon, A., additional, Pouliot, J., additional, Stokstad, R. G., additional, Kaufman, S., additional, Videbaek, F., additional, Fraenkel, Z., additional, Peilert, G., additional, Stöcker, H., additional, Greiner, W., additional, Botvina, A., additional, and Mishustin, I. N., additional

Published
1992
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398. Fission from Fe and Nb reactions with heavy targets at 50–100 MeV/nucleon

Author

Begemann-Blaich, M., primary, Blaich, Th., additional, Fowler, M. M., additional, Wilhelmy, J. B., additional, Britt, H. C., additional, Fields, D. J., additional, Hansen, L. F., additional, Lanier, R. G., additional, Massoletti, D. J., additional, Namboodiri, M. N., additional, Remington, B. A., additional, Sangster, T. C., additional, Struble, G. L., additional, Webb, M. L., additional, Chan, Y. D., additional, Dacal, A., additional, Harmon, A., additional, Pouliot, J., additional, Stokstad, R. G., additional, Kaufman, S., additional, Videbaek, F., additional, and Fraenkel, Z., additional

Published
1992
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399. OMEGA polar-drive target designs.

Author

Radha, P. B., Marozas, J. A., Marshall, F. J., Shvydky, A., Collins, T. J. B., Goncharov, V. N., McCrory, R. L., McKenty, P. W., Meyerhofer, D. D., Sangster, T. C., and Skupsky, S.

Subjects
PLASMA physics, LASERS in physics, LASER-plasma interactions, LOW temperature engineering, DEUTERIUM, TRITIUM, STRUCTURAL shells, LASER pulses
Abstract

Low-adiabat polar-drive (PD) [Skupsky et al., Phys. Plasmas 11, 2763 (2004)] implosion designs for the OMEGA [Boehly et al., Opt. Commun. 133, 495 (1997)] laser are described. These designs for cryogenic deuterium-tritium and warm plastic shells use a temporal laser pulse shape with three pickets followed by a main pulse [Goncharov et al., Phys. Rev. Lett. 104, 165001 (2010)]. The designs are at two different on-target laser intensities, with different in-flight aspect ratios (IFARs). These designs permit studies of implosion energetics and target performance closer to ignition-relevant intensities (∼7 × 1014 W/cm2 at the quarter-critical surface, where nonlocal heat conduction and laser-plasma interactions can play an important role) but at lower values of IFAR ∼ 22 or at lower intensity (∼3 × 1014 W/cm2) but at a higher IFAR (IFAR ∼ 32, where shell instability can play an important role). PD geometry requires repointing of laser beams to improve shell symmetry. The higher-intensity designs optimize target performance by repointing beams to a lesser extent, compensating for the reduced equatorial drive by increasing the energies of the repointed beams. They also use custom beam profiles that improve equatorial illumination at the expense of irradiation at higher latitudes. These latter designs will be studied when new phase plates for the OMEGA Laser System, corresponding to the custom beam profiles, are obtained. [ABSTRACT FROM AUTHOR]

Published
2012
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400. Experimental reduction of laser imprinting and Rayleigh-Taylor growth in spherically compressed, medium-Z-doped plastic targets.

Author

Fiksel, G., Hu, S. X., Goncharov, V. A., Meyerhofer, D. D., Sangster, T. C., Smalyuk, V. A., Yaakobi, B., Bonino, M. J., and Jungquist, R.

Subjects
MOLECULAR imprinting, RAYLEIGH-Taylor instability, MATERIALS compression testing, SEMICONDUCTOR doping, PLASTICS, VOLUMETRIC analysis, X-ray diffraction
Abstract

The effect of medium-Z doping of plastic ablators on laser imprinting and Rayleigh-Taylor (RT) instability growth was studied using spherical direct-drive implosions on the OMEGA Laser System [T. R. Boehly et al., Opt. Commun. 133, 495 (1977)]. The targets were spherical plastic (CH) shells, with an outer diameter of 860 μm and a thickness of 22 μm, volume doped with a varied concentration of Si (4.3% and 7.4%) and Ge (3.9%). The targets were imploded with 48 beams with a low-adiabat, triple-picket laser shape pulse with a peak intensity of 4×1014W/cm2, and a pulse duration of 2.5 ns. The shells were x-ray radiographed through a 400 -μm opening in the side of the target. The results show that volumetric impurity doping strongly reduces the shell density modulation and the instability growth rate. The amplitude of the initial imprint is reduced by a factor of 2.5 ± 0.5 for CH[4.3% Si] targets and by a factor of 3 ± 0.5 for CH[7.4% Si] and CH[3.9% Ge] targets. At the end of the acceleration phase, the reduction factor becomes 3 ± 0.5 and 5 ± 0.5, correspondingly. The RT instability growth rate in doped targets is reduced by a factor of 1.5 compared to undoped ones. Simulations using the two-dimensional, radiation-hydrodynamics code draco show good agreement with the measurements. [ABSTRACT FROM AUTHOR]

Published
2012
Full Text
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