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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.

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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