OPTIMIZED CONTINUUM X-RAY EMISSION FROM LASER-GENERATED PLASMA

ORAL

Abstract

We study continuum x-ray emission from hot plasma at the National Ignition Facility (NIF). We find that the x-ray yield in the multi-keV photon energy range is larger in Ti than in Ag or Au. This apparent paradox is due to Ti K-shell vacancies generated by the extraordinary energy density achieved by the NIF lasers. This is supported by direct observations of large continuum enhancement above the Ti K-series limit due to both free–bound (recombination) emission and strong Ly a (H-like) emission. Detailed calculations agree well with our measurements and support our conclusions. Results of extended x-ray absorption fine structure measurements of highly compressed solids at NIF using this source will also be presented.

*This work was performed under the auspices of U.S. Department of Energy by the Lawrence Livermore National Laboratory under Contract No. DE-AC52-07NA27344.

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Publication: Krygier et al., Appl. Phys. Lett. 117, 251106 (2020)

Presenters

  • Andrew Krygier

    • Lawrence Livermore National Laboratory

Authors

  • Andrew Krygier

    • Lawrence Livermore National Laboratory

  • Gregory E Kemp

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

  • Federica Coppari

    • Lawrence Livermore Natl Lab

  • Daniel B Thorn

    • LLNL
    • Lawrence Livermore Natl Lab

  • David K Bradley

    • Lawrence Livermore Natl Lab

  • Alexandre Do

    • Lawrence Livermore Natl Lab

  • Jon H Eggert

    • Lawrence Livermore Natl Lab

  • Warren W Hsing

    • Lawrence Livermore Natl Lab

  • Shahab F Khan

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

  • Christine M Krauland

    • General Atomics

  • Otto L Landen

    • Lawrence Livermore Natl Lab

  • Michael J MacDonald

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

  • James M McNaney

    • Lawrence Livermore Natl Lab

  • Hye-Sook Park

    • Lawrence Livermore Natl Lab
    • LLNL

  • Bruce A Remington

    • Lawrence Livermore National Laboratory
    • Lawrence Livermore Natl Lab

  • Michael S Rubery

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

  • Marilyn B Schneider

    • Lawrence Livermore Natl Lab
    • LLNL

  • H. Sio

    • Lawrence Livermore Nat Lab
    • Lawrence Livermore Natl Lab
    • LLNL

  • Yuan Ping

    • Lawrence Livermore Natl Lab