Extended X-ray Absorption Fine Structure Temperature Analysis of Nickel and Invar at High-Energy-Density Conditions

ORAL

Abstract

A critical step in understanding high-energy-density (HED) matter is to characterize the temperature of materials at these extreme conditions. Temperature measurements are historically difficult at low-temperature HED conditions (above 100 GPa and below 5000 K). Extended x-ray absorption fine structure (EXAFS) spectroscopy is one of the few experimental techniques capable of constraining temperature at these conditions by measuring the variation in the distances between neighboring atoms. Experimental EXAFS spectra of statically compressed nickel and dynamically compressed invar were analyzed with a Bayesian inference routine to infer the atom positions. These atom positions were related to temperature using a variety of models that highlight the need and diversity of anharmonic corrections at HED conditions. This material is based upon work supported by the Department of Energy [National Nuclear Security Administration] University of Rochester “National Inertial Confinement Fusion Program” under Award Number(s) DE-NA0004144.

*This material is based upon work supported by the Department of Energy [National Nuclear Security Administration] University of Rochester "National Inertial Confinement Fusion Program" under Award Number(s) DE-NA0004144.

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Presenters

  • David A Chin

    • Laboratory for Laser Energetics
    • University of Rochester

Authors

  • David A Chin

    • Laboratory for Laser Energetics
    • University of Rochester

  • Philip M Nilson

    • Laboratory for Laser Energetics (LLE)

  • M. Signor

    • Laboratory for Laser Energetics

  • Ethan A Smith

    • Laboratory for Laser Energetics (LLE)

  • Griffin Hess

    • University of Rochester

  • Niaz Abdolrahim

    • Laboratory for Laser Energetics, University of Rochester; and Department of Mechanical Engineering, University of Rochester
    • University of Rochester

  • J. Ryan R Rygg

    • Laboratory for Laser Energetics, University of Rochester

  • Gilbert W Collins

    • University of Rochester
    • Laboratory for Laser Energetics

  • Silvia Boccato

    • IMPMC - CNRS
    • Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, Sorbonne Université, Muséum National d'Histoire Naturelle

  • Raffaella Torchio

    • ESRF

  • David T Bishel

    • University of Rochester

  • Stanimir A Bonev

    • Lawrence Livermore National Laboratory
    • Lawrence Livermore Natl Lab

  • Federica Coppari

    • Lawrence Livermore National Laboratory

  • Yuan Ping

    • Lawrence Livermore National Laboratory

  • Grant B Bunker

    • Illinois Institute of Technology