XAFS+SOP experiments provide a pathway towards thermal conductivity measurements at HED conditions

ORAL

Abstract

Directly measuring temperature as well as thermal conductivity at HED conditions is challenging. At the Laboratory for Laser Energetics (LLE), a Streaked Optical Pyrometer (SOP) measures the self-emission of heated samples above 3600 K and the X-ray Absorption Fine Structure (XAFS) spectroscopy platform measures simultaneous temperature, density and pressure. SOP and XAFS data of the Fe K-edge were collected at two times, 10 ns apart, within in a constant pressure hold and a clear temperature increase was observed. This data is used to estimate the thermal conductivity of Fe near 200 GPa.

*Funding (or partial funding) for this research was provided by the Center for Matter at Atomic Pressures (CMAP), a National Science Foundation (NSF) Physics Frontier Center, under Award PHY-2020249. Any opinions, findings, conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect those of the National Science Foundation.

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Presenters

  • Matthew Edward Signor

    • University of Rochester
    • Laboratory for Laser Energetics, University of Rochester

Authors

  • Matthew Edward Signor

    • University of Rochester
    • Laboratory for Laser Energetics, University of Rochester

  • D. A. Alexander Chin

    • University of Rochester
    • Laboratory for Laser Energetics

  • Ethan A Smith

    • University of Rochester
    • Laboratory for Laser Energetics, University of Rochester

  • Alexa LaPierre

    • University of Rochester

  • Neel Kabadi

    • University of Rochester

  • David T Bishel

    • University of Rochester

  • Amy L Coleman

    • Lawrence Livermore National Laboratory

  • Hong Sio

    • Lawrence Livermore National Laboratory

  • Andrew Krygier

    • Lawrence Livermore National Laboratory

  • Yuan Ping

    • Lawrence Livermore National Laboratory
    • Lawrence Livermore Natl Lab

  • Ryan Rygg

    • Laboratory for Laser Energetics

  • Gilbert W Collins

    • Laboratory for Laser Energetics
    • University of Rochester
    • Laboratory for Laser Energetics, University of Rochester