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Title: Measurement of the sound velocity and Grüneisen parameter of polystyrene at inertial confinement fusion conditions

Journal Article · · Physical Review B

The principal Hugoniot, sound velocity, and Grüneisen parameter of polystyrene were measured at conditions relevant to shocks in inertial confinement fusion implosions, from 100 to 1000 GPa. The sound velocity is in good agreement with quantum molecular dynamics calculations and all tabular equation of state models at pressures below 200 GPa. Above 200 GPa, the experimental results agree with two of the examined tables, but do not agree with the most recent table developed for design of ICF experiments. The Grüneisen parameter increases with density below ~3.1 g/cm3 and approaches the asymptotic value for an ideal gas after complete dissociation. This behavior is in good agreement with quantum molecular dynamics results and previous work but is not represented by any of the tabular models. Finally, the discrepancy between tabular models and experimental measurement of the sound velocity and Grüneisen parameter is sufficient to impact simulations of ICF experiments.

Research Organization:
Univ. of Rochester, NY (United States). Lab. for Laser Energetics; Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
NA0003856; AC04-94AL85000; AC52-07NA27344
OSTI ID:
1714353
Alternate ID(s):
OSTI ID: 1721620; OSTI ID: 1867107
Report Number(s):
2020-243,1596,2551; SAND-2020-12136J; LLNL-JRNL-835042; 2020-243, 1596, 2551; TRN: US2204758
Journal Information:
Physical Review B, Vol. 102, Issue 18; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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