The Compressibility of Shocked Hydrogen up to 1 TPa
ORAL · Invited
Abstract
Warm dense hydrogen near 1 TPa (1 TPa = 10 million atm) sits at a confluence of energy scales, where the thermal energy, Fermi energy, Coulomb coupling energy, and plasma oscillation energy are simultaneously in the vicinity of the free-hydrogen ionization energy of 1 Ry = 13.6 eV. Recent Hugoniot and sound speed experiments on single- and double-shocked liquid deuterium[1],[2] provide evidence for increased compression of hydrogen compared to all theoretical models in this regime. We show that a specific heat contribution from plasma waves, not explicitly included in the theoretical models, is sufficient to explain the compressibility discrepancy. This model will be compared to recent experimental results obtained at the National Ignition Facility for deuterium shocked and reshocked above 1 TPa and 2 TPa, respectively. This material is based upon work supported by the Department of Energy National Nuclear Security Administration under Award Number DE-NA0003856.
[1] A. Fernandez-Pañella et al., Phys. Rev. Lett. 122, 255702 (2019).
[2] D. E. Fratanduono et al., Phys. Plasmas 26, 012710 (2019).
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Presenters
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J. Ryan Rygg
University of Rochester, Laboratory for Laser Energetics, University of Rochester
Authors
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J. Ryan Rygg
University of Rochester, Laboratory for Laser Energetics, University of Rochester
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Gilbert W Collins
University of Rochester Laboratory for Laser Energetics, University of Rochester, University of Rochester, Laboratory for Laser Energetics, Laboratory for Laser Energetics, University of Rochester
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Peter M Celliers
Lawrence Livermore Natl Lab
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Linda E Hansen
SNL, Sandia National Laboratories
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Mohamed Zaghoo
University of Rochester Laboratory for Laser Energetics, University of Rochester