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Title: Theoretical and experimental investigation of the equation of state of boron plasmas

Journal Article · · Physical Review E

We report a theoretical equation of state (EOS) table for boron across a wide range of temperatures (5.1 104{5.2 108 K) and densities (0.25{49 g/cm3), and experimental shock Hugoniot data at unprecedented high pressures (5608 118 GPa). The calculations are performed with first-principles methods combining path integral Monte Carlo (PIMC) at high temperatures and density functional theory molecular dynamics (DFT-MD) methods at lower temperatures. PIMC and DFT-MD cross-validate each other by providing coherent EOS (difference <1.5 Hartree/boron in energy and <5% in pressure) at 5.1 105 K. The Hugoniot measurement is conducted at the National Ignition Facility using a planar shock platform. The pressure-density relation found in our shock experiment is on top of the shock Hugoniot profile predicted with our first-principles EOS and a semi-empirical EOS table (LEOS 50). We investigate the self diffusivity and the effect of thermal and pressure-driven ionization on the EOS and shock compression behavior in high pressure and temperature conditions. We also study the sensitivity of a polar direct-drive exploding pusher platform to pressure variations based on applying pressure multipliers to LEOS 50 and by utilizing a new EOS model based on our ab initio simulations via 1D radiation-hydrodynamic calculations. The results are valuable for future theoretical and experimental studies and engineering design in high energy density research.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC52-07NA27344; SC0016248
OSTI ID:
1512581
Alternate ID(s):
OSTI ID: 1466075
Report Number(s):
LLNL-JRNL-748227; PLEEE8; 933253
Journal Information:
Physical Review E, Vol. 98, Issue 2; ISSN 2470-0045
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 22 works
Citation information provided by
Web of Science

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Cited By (3)

Electronic structure of first and second row atoms under harmonic confinement journal December 2019
Magnesium oxide at extreme temperatures and pressures studied with first-principles simulations journal December 2019
Pressure and energy of compressional shocks in two-dimensional Yukawa systems journal October 2019

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