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DOE OSTI · 3024406

Ionization and temperature measurements in warm dense copper using x-ray absorption spectroscopy

Cordova, Tanner [Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Univ. of California, San Diego, CA (United States)] (ORCID:0000000318777953)·Marley, Edward V. [Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)] (ORCID:000000017030944X)·Chin, David A. [Univ. of Rochester, NY (United States)] (ORCID:0000000301187690)·London, Rich A. [Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)] (ORCID:0000000318535815)·Scott, Howard A. [Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)]·Kruse, M. K. G. [Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)] (ORCID:0000000289013857)·Döppner, Tilo [Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)] (ORCID:0000000257037125)·Beg, Farhat N. [Univ. of California, San Diego, CA (United States)] (ORCID:0000000303918944)·Coppari, Federica [Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)] (ORCID:0000000315923898)·Millot, Marius [Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)] (ORCID:0000000344143532)·Emig, Jim [Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)]·Hansen, Stephanie B. [Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)] (ORCID:0000000218869770)·Nilson, Philip M. [Univ. of Rochester, NY (United States)] (ORCID:0000000290168055)·Sterne, Phil [Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)] (ORCID:0000000263983185)·MacDonald, Mike J. [Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)] (ORCID:0000000262956978)
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Abstract

We detail experimental results inferring ionization and temperature for warm dense copper plasmas at several times solid density (15–25 g/cm 3 ) and temperatures of 10–21 eV. Experiments performed at the OMEGA Laser Facility generate uniform warm dense matter conditions via symmetric shock compression of a buried copper layer. The plasma is probed with a laser-generated x-ray source to collect the K-shell x-ray absorption spectrum. Fitting bound-bound absorption contributions from constituent charge states of copper provides an estimated $\overline{Z}$ of approximately 4–7 for these warm dense copper plasmas. We find that these partially ionized plasmas have K-edge shifts of 12–30 eV and bound-bound resonance 1s → 3p absorption shifts of 4–26 eV with respect to the cold K edge. This study provides necessary experimental data to improve ionization and opacity models in the warm dense matter regime.

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42 ENGINEERINGAtomic spectraPhysics - Atomic and molecular physicsPhysics - Plasma physicsPlasma ionizationSpectroscopyWarm-dense matterX-ray absorption spectroscopy

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Cordova, Tanner [Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Univ. of California, San Diego, CA (United States)] (ORCID:0000000318777953), Marley, Edward V. [Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)] (ORCID:000000017030944X), Chin, David A. [Univ. of Rochester, NY (United States)] (ORCID:0000000301187690), London, Rich A. [Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)] (ORCID:0000000318535815), Scott, Howard A. [Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)], Kruse, M. K. G. [Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)] (ORCID:0000000289013857), Döppner, Tilo [Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)] (ORCID:0000000257037125), Beg, Farhat N. [Univ. of California, San Diego, CA (United States)] (ORCID:0000000303918944), Coppari, Federica [Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)] (ORCID:0000000315923898), Millot, Marius [Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)] (ORCID:0000000344143532), Emig, Jim [Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)], Hansen, Stephanie B. [Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)] (ORCID:0000000218869770), Nilson, Philip M. [Univ. of Rochester, NY (United States)] (ORCID:0000000290168055), Sterne, Phil [Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)] (ORCID:0000000263983185), MacDonald, Mike J. [Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)] (ORCID:0000000262956978). 2026-02-27. Ionization and temperature measurements in warm dense copper using x-ray absorption spectroscopy. https://doi.org/10.1103/7vf4-flqv

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