Bulletin of the American Physical Society
17th Biennial International Conference of the APS Topical Group on Shock Compression of Condensed Matter
Volume 56, Number 6
Sunday–Friday, June 26–July 1 2011; Chicago, Illinois
Session P5: High Energy Density Physics/Warm Dense Matter II |
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Chair: Marcus Knudson, Sandia National Laboratories Room: Renaissance Ballroom D |
Wednesday, June 29, 2011 2:00PM - 2:15PM |
P5.00001: Shock-Timing Measurements in ICF Targets Filled with Liquid Deuterium Thomas Boehly, Valeri Goncharov, Maria Barrios, Dayne Frantanduono, Suxing Hu, Timothy Collins, John Morozas, Thomas Sangster, David Meyerhofer, Peter Celliers, Harry Robey, Damien Hicks, Gilbert Collins High-performance ICF target designs use multiple shocks to condition the shell before it is imploded. Accurate timing of these shocks is critical to target performance. We report on experiments on the OMEGA Laser where up to four spherical shocks were observed in directly driven spherical targets filled with liquid deuterium. The measured shock velocity profiles exhibit the coalescence times of those shock and contain the first observations of convergence effect (pressure increase with decreasing radius) and the highest shock velocity observed in liquid deuterium (135 km/s). Simulations of these experiments accurately model the shock velocities and timing when a non-local electron transport model is used for heat conduction. These experiments are the basis for tuning campaigns performed on the National Ignition Facility to tune laser pulse shape to achieve the specifications for ignition targets. This work was supported by the U.S. Department of Energy Office of Inertial Confinement Fusion under Cooperative Agreement No. DE-FC52-08NA28302. [Preview Abstract] |
Wednesday, June 29, 2011 2:15PM - 2:30PM |
P5.00002: Shock Timing experiments on the National Ignition Facility P.M. Celliers, T.R. Boehly, H.F. Robey, P.S. Datte, M.W. Bowers, K.G. Krauter, G. Frieders, G.F. Ross, J.L. Jackson, R.E. Olson, D.H. Munro, A. Nikroo, J.J. Kroll, J.B. Horner, A.V. Hamza, S.D. Bhandarkar, C.R. Gibson, J.H. Eggert, R.F. Smith, H.-S. Park, B.K. Young, W.W. Hsing, G.W. Collins, O.L. Landen, D.D. Meyerhofer Experiments are proceeding to tune the initial shock compression sequence of capsule implosions on the National Ignition Facility. These experiments use a modified cryogenic hohlraum geometry designed to match the performance of ignition hohlraums. The targets employ a re-entrant Au cone to provide optical access to the shocks as they propagate in the liquid deuterium-filled capsule interior. The strength and timing of the shock sequence is diagnosed with VISAR (Velocity Interferometer System for Any Reflector). The results of these measurements will be used to set the pulse shape for ignition capsule implosions to follow. [Preview Abstract] |
Wednesday, June 29, 2011 2:30PM - 3:00PM |
P5.00003: Hydrogen Strongly Coupled Plasma at Megabar Pressures Invited Speaker: New experimental results on thermodynamics and electrical conductivity of shock and isoentropically compressed hydrogen and deuterium are presented. Strongly coupled plasmas in which pressures achieved 18 Mbar, Coulomb coupling parameter exceeded 450, electron degeneracy parameter came up to 290 were obtained with semi-spherical explosive-driven generators. Theoretical models for description of thermodynamics of warm dense hydrogen, the experiment and theory comparison for hydrogen strongly non-ideal plasmas under high energy density are presented. Experimental and theoretical problems in studying of warm dense hydrogen are discussed.\\[4pt] Work done in collaboration with R.I. Il'kayev, M.A. Mochalov, M.V. Zhernokletov, A.L. Mikhailov, V.B. Mintsev, I.L. Iosilevskiy, and V.Ya. Ternovoi. [Preview Abstract] |
Wednesday, June 29, 2011 3:00PM - 3:15PM |
P5.00004: ABSTRACT WITHDRAWN |
Wednesday, June 29, 2011 3:15PM - 3:30PM |
P5.00005: Measurements of multi-shock compressed deuterium to 500 GPa J. Ryan Rygg, D.G. Hicks, T.R. Boehly, P.M. Celliers, R.F. Smith, G.W. Collins, O.L. Landen The equation of state and transport properties of compressed hydrogenic materials affect the structure of gas-giant planets and the performance of inertial confinement fusion targets. Deuterium samples were compressed up to 5 Mbar by a sequence of laser-driven shocks. Results of simultaneous pressure, temperature, and optical reflectivity measurements of these samples will be reported. This work performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344. [Preview Abstract] |
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