Observation of anomalous heating of compressed materials by adjacent diamond layers using EXAFS measurements

ORAL

Abstract

Large laser facilities have recently enabled compression of materials above TPa pressures. However, measuring the temperature of the compressed materials remains a challenging problem. We are developing a platform on NIF using EXAFS (Extended X-ray Absorption Fine Structure) to probe the bulk temperature of highly compressed materials. EXAFS 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. Excellent EXAFS data have been obtained for Cu K-edge up to 10 Mbar. It is observed unexpectedly that the copper temperature is much higher than predicted when adjacent to diamond layer(s), showing the importance of heat transport on the thermal state of materials (Sio et al, submitted). The follow-up experiments and 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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Presenters

  • Yuan Ping

    • Lawrence Livermore Natl Lab

Authors

  • Yuan Ping

    • Lawrence Livermore Natl Lab

  • Hong Sio

    • Lawrence Livermore National Laboratory

  • Andrew Krygier

    • Lawrence Livermore National Laboratory

  • Stanimir A Bonev

    • Lawrence Livermore Natl Lab

  • Robert E Rudd

    • Lawrence Livermore Natl Lab

  • David K Bradley

    • Lawrence Livermore Natl Lab
    • Lawrence Livermore National Laboratory

  • Dave Braun

    • Lawrence Livermore Natl Lab

  • Amy L Coleman

    • Lawrence Livermore Natl Lab

  • Federica Coppari

    • Lawrence Livermore Natl Lab

  • Jon H Eggert

    • LLNL

  • Dayne Fratanduono

    • Lawrence Livermore Natl Lab

  • Sebastien Hamel

    • Lawrence Livermore Natl Lab

  • Warren W Hsing

    • Lawrence Livermore Natl Lab

  • Gregory E Kemp

    • Lawrence Livermore Natl Lab
    • Lawrence Livermore National Lab
    • LLNL

  • Bernard Kozioziemski

    • Lawrence Livermore Natl Lab

  • Tom Lockard

    • Lawrence Livermore Natl Lab

  • Andy J Mackinnon

    • Lawrence Livermore Natl Lab

  • James M McNaney

    • Lawrence Livermore Natl Lab

  • Marius Millot

    • LLNL
    • Lawrence Livermore Natl Lab
    • Lawrence Livermore National Laboratory

  • Hye-Sook Park

    • LLNL

  • Marilyn B Schneider

    • Lawrence Livermore Natl Lab
    • LLNL

  • Stanislav Stoupin

    • Lawrence Livermore National Laboratory

  • Manfred L Bitter

    • Princeton Plasma Physics Laboratory

  • Philip C Efthimion

    • Princeton Plasma Physics Laboratory

  • Lan Gao

    • PPPL
    • Princeton Plasma Physics Laboratory

  • Kenneth W Hill

    • PPPL
    • Princeton Plasma Physics Laboratory

  • Frances Kraus

    • Princeton Plasma Physics Laboratory
    • PPPL

  • Novimir A Pablant

    • Princeton Plasma Physics Laboratory