EXAFS at L-edges for temperature measurements toward higher-Z materials at NIF

ORAL

Abstract

EXAFS (Extended X-ray Absorption Fine Structure) refers to the oscillatory modulations in x-ray absorption spectra above an absorption edge, generated by interference between photoelectron waves and scattering by neighbor atoms. EXAFS is sensitive to temperature of materials in the range of 100-10000K because ionic thermal motion reduces the coherence of the interference, leading to decay of the modulations. The EXAFS measurements at L-edge are more challenging due to smaller EXAFS amplitude. The high x-ray flux at NIF has enabled L-edge measurements for higher-Z materials such as Ta at 10keV and Pb at 13keV. This talk will report recent progress in L-edge EXAFS measurements at NIF and platform development to extend the spectral range to 18keV. The good quality of EXAFS data at Ta L-edge made it possible to compare the resulting Ta temperatures from ramp and shock-ramp drive with various strength models. This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344.

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Presenters

  • Yuan Ping

    • Lawrence Livermore National Laboratory
    • Lawrence Livermore Natl Lab

Authors

  • Yuan Ping

    • Lawrence Livermore National Laboratory
    • Lawrence Livermore Natl Lab

  • Andrew Krygier

    • Lawrence Livermore National Laboratory

  • Hong Sio

    • Lawrence Livermore National Laboratory

  • Stanimir A Bonev

    • Lawrence Livermore Natl Lab

  • Amy L Coleman

    • Lawrence Livermore National Laboratory

  • Federica Coppari

    • Lawrence Livermore Natl Lab

  • David K. Bradley

    • Lawrence Livermore Natl Lab
    • Lawrence Livermore National Laboratory

  • Jon Henry Eggert

    • LLNL

  • Warren Wen-Man Hsing

    • Lawrence Livermore Natl Lab

  • Gregory E Kemp

    • Lawrence Livermore National Lab
    • Lawrence Livermore National Laboratory

  • Bernard Kozioziemski

    • Lawrence Livermore Natl Lab
    • Lawrence Livermore National Lab

  • Tom Lockard

    • Lawrence Livermore Natl Lab

  • Andy J Mackinnon

    • Lawrence Livermore Natl Lab

  • James M McNaney

    • Lawrence Livermore Natl Lab

  • Hye-Sook Park

    • LLNL
    • Lawrence Livermore National Laboratory

  • Robert E Rudd

    • Lawrence Livermore Natl Lab

  • Marilyn Beth Schneider

    • Lawrence Livermore Natl Lab

  • Stanislav Stoupin

    • Lawrence Livermore National Laboratory

  • Manfred Ludwig Bitter

    • Princeton Plasma Physics Laboratory

  • Philip Charles Efthimion

    • Princeton Plasma Physics Laboratory
    • Princeton Plasma Physics Laboratory (PPPL)

  • Lan Gao

    • PPPL

  • Kenneth W Hill

    • Princeton Plasma Physics Laboratory
    • Princeton University

  • Frances Kraus

    • Princeton Plasma Physics Laboratory
    • Princeton Plasma Physics Laboratory (PPPL)

  • Novimir A Pablant

    • Princeton Plasma Physics Laboratory