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

Abstract

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 usmore » 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.« less

Authors:

Millot, Marius  ^[1];

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• Search DOE PAGES for ORCID "0000-0003-4414-3532"

Sterne, Philip A.  ^[1];

• Search DOE PAGES for author "Sterne, Philip A."
• Search DOE PAGES for ORCID "0000-0002-6398-3185"

Eggert, Jon H.  ^[1];

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• Search DOE PAGES for ORCID "0000-0001-5730-7108"

Hamel, Sebastien  ^[1];

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• Search DOE PAGES for ORCID "0000-0003-4246-0892"

Marshall, Michelle C.  ^[1];

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• Search DOE PAGES for ORCID "0000-0001-8797-3005"

Celliers, Peter M.  ^[1]

• Search DOE PAGES for author "Celliers, Peter M."
• Search DOE PAGES for ORCID "0000-0001-7600-1227"

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+ Show Author Affiliations

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

Publication Date:

Thu Oct 22 00:00:00 EDT 2020

Research Org.:

Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Org.:

USDOE National Nuclear Security Administration (NNSA)

OSTI Identifier:

1682524

Alternate Identifier(s):

OSTI ID: 1682366

Report Number(s):

LLNL-JRNL-801541
Journal ID: ISSN 1070-664X; 1005374; TRN: US2204058

Grant/Contract Number:  

AC52-07NA27344

Resource Type:

Accepted Manuscript

Journal Name:

Physics of Plasmas

Additional Journal Information:

Journal Volume: 27; Journal Issue: 10; Journal ID: ISSN 1070-664X

Publisher:

American Institute of Physics (AIP)

Country of Publication:

United States

Language:

English

Subject:

75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Lasers; Planetology; Shock compression; Velocimetry; Equations of state; Shock waves; Hugoniot curve