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