EXAFS for probing thermal states of compressed 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 because ionic thermal motion reduces the coherence of the interference, leading to decay of the modulations. This talk will give a brief overview of the EXAFS platform at NIF, including development of a bright continuum backlighter [1], a high-resolution spectrometer [2], and a novel shape of crystal to achieve both high throughput and high resolution [3]. Excellent EXAFS data at K-edge have been obtained for Fe compressed up to 8 Mbar and Cu up to 10 Mbar. 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 and Pb. The prospect of such a new capability at NIF for probing thermal states of compressed materials will be discussed.

*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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Publication: [1] A. Krygier, et al. App. Phys. Lett. 117, 251106 (2020).
[2] S. Stoupin, et al. Rev. Sci. Instrum. 92, 053102 (2021).
[3] N.A. Pablant, et al. Rev. Sci. Instrum. 92, 093904 (2021).

Presenters

  • Yuan Ping

    • Lawrence Livermore Natl Lab

Authors

  • Yuan Ping

    • Lawrence Livermore Natl Lab

  • H. Sio

    • Lawrence Livermore Natl Lab

  • Andrew Krygier

    • Lawrence Livermore National Laboratory
    • Lawrence Livermore Natl Lab

  • David G Braun

    • Lawrence Livermore Natl Lab
    • Lawrence Livermore Nationasl Laboratory

  • Robert E Rudd

    • Lawrence Livermore Natl Lab

  • Stanimir Bonev

    • Lawrence Livermore Natl Lab

  • Gregory E Kemp

    • Lawrence Livermore Natl Lab

  • Marius Millot

    • Lawrence Livermore Natl Lab

  • Dayne E Fratanduono

    • Lawrence Livermore Natl Lab
    • Lawrence Livermore National Laboratory

  • Amy L Coleman

    • Lawrence Livermore Natl Lab

  • Federica Coppari

    • Lawrence Livermore Natl Lab

  • Nobuhiko Izumi

    • Lawrence Livermore Natl Lab

  • Stanislav Stoupin

    • Lawrence Livermore National Laboratory

  • Jon H Eggert

    • Lawrence Livermore Natl Lab
    • Lawrence Livermore National Laboratory

  • Hye-Sook Park

    • Lawrence Livermore Natl Lab

  • Marilyn B Schneider

    • Lawrence Livermore Natl Lab

  • James M McNaney

    • Lawrence Livermore Natl Lab
    • Lawrence Livermore National Laboratory

  • David K Bradley

    • Lawrence Livermore Natl Lab

  • Warren W Hsing

    • Lawrence Livermore Natl Lab

  • Neil Ose

    • Lawrence Livermore Natl Lab

  • Bernard Kozioziemski

    • Lawrence Livermore Natl Lab

  • Andy J Mackinnon

    • Lawrence Livermore Natl Lab

  • Lan Gao

    • PPPL

  • Kenneth W Hill

    • PPPL

  • Novimir A Pablant

    • Princeton Plasma Physics Laboratory

  • Manfred L Bitter

    • Princeton Plasma Physics Laboratory

  • Brian F Kraus

    • Princeton Plasma Physics Laboratory

  • Philip C Efthimion

    • Princeton Plasma Physics Laboratory