High-precision shock equation of state measurements for metallic fluid carbon between 15 and 20 Mbar

Millot, Marius; Sterne, Philip A.; Eggert, Jon H.; Hamel, Sebastien; Marshall, Michelle C.; Celliers, Peter M.

doi:10.1063/5.0007304

Title: High-precision shock equation of state measurements for metallic fluid carbon between 15 and 20 Mbar

Journal Article · Thu Oct 22 00:00:00 EDT 2020 · Physics of Plasmas

DOI:https://doi.org/10.1063/5.0007304· OSTI ID:1682524

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Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Diamond is an efficient ablator material to convert the energy of high-power giant lasers into ablation pressure with applications for High-Energy-Density (HED) science, planetary science, and Inertial Confinement Fusion (ICF) research at the National Ignition Facility (NIF). Unfortunately, current theoretical equation of state models cannot reproduce all the observed experimental data in the multi-megabar regime particularly relevant for HED and ICF research. New experimental data on the behavior of carbon at extreme pressures and temperatures are, therefore, essential to improve our predictive capability to design and analyze dynamic compression experiments for HED or ICF research and build improved equation of state models in the future. In this paper, we report high-precision laser-driven shock compression measurements on diamond single crystals at the Omega Laser Facility. Using ultrafast Doppler optical Velocimetry Interferometer System for Any Reflector (VISAR) to track the leading shock front and a quartz plate as an in situ reference, we obtain relative pressure-density shock equation-of-state measurements between 15 and 20 Mbar with an impedance-matching procedure. We also report shock-and-release measurements in a spherical geometry at the NIF. The new data provide tight constraints on the compressibility of warm dense carbon along the Hugoniot of full density diamond, allowing us to discriminate between existing theoretical equation-of-state models. We find that both LLNL LEOS 9061 and LANL Sesame 7835 models capture well the shock compressibility in the explored range. LANL Sesame 7835 also reproduces well the observed shock-and-release behavior of diamond near 10–20 Mbar.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1682524

Alternate ID(s):: OSTI ID: 1682366

Report Number(s):: LLNL-JRNL-801541; 1005374; TRN: US2204058

Journal Information:: Physics of Plasmas, Vol. 27, Issue 10; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: High-precision shock equation of state measurements for metallic fluid carbon between 15 and 20 Mbar

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