Measurement of Spatial Temperature, Density and Mix Distributions in Igniting Plasmas on the NIF

ORAL

Abstract

Now that NIF has achieved ignition and multiple experiments have achieved megajoule yields, we can study detailed plasma conditions in igniting plasmas. By combining multi-view, spectrally resolved x-ray [1] and neutron [2] imaging systems, we reconstruct time-integrated density and temperature profiles of burning hotspots near ignition. The differentially filtered x-ray imaging system constrains the electron temperature which, combined with neutron imaging, constrains the ion density without assuming that the system is isobaric [3]. With an absolutely calibrated x-ray measurement, we can extract the profile of ablator mix into the thermonuclear fuel. We can distinguish between localized mix (visible mix jets) and non-localized mix and quantify the corresponding mix mass and mix density.

[1] K. W. Wong and B. Bachmann, Rev. Sci. Instrum. 93, 073501 (2022)

[2] P. Volegov et al., J. Appl. Phys. 118, 205903 (2015)

[3] A. Pak et al., Phys. Rev. Lett. 124, 145001 (2020)

*This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344.

–

Presenters

  • Benjamin Bachmann

    • Lawrence Livermore Natl Lab
    • Lawrence Livermore National Laboratory

Authors

  • Benjamin Bachmann

    • Lawrence Livermore Natl Lab
    • Lawrence Livermore National Laboratory

  • Laurent Divol

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

  • Riccardo Tommasini

    • Lawrence Livermore National Laboratory

  • Arthur E Pak

    • Lawrence Livermore Natl Lab
    • Lawrence Livermore National Laboratory

  • Bernard Kozioziemski

    • Lawrence Livermore Natl Lab

  • Abbas Nikroo

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

  • Joseph E Ralph

    • Lawrence Livermore Natl Lab

  • Nicholas W Ruof

    • Lawrence Livermore National Laboratory
    • Lawrence Livermore Natl Lab

  • Shahab Khan

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

  • Andrew MacPhee

    • Lawrence Livermore Natl Lab

  • David Fittinghoff

    • Lawrence Livermore Natl Lab

  • Raspberry Simpson

    • Lawrence Livermore National Laboratory
    • Lawrence Livermore Natl Lab

  • Christopher Danly

    • Los Alamos National Laboratory
    • Los Alamos National Lab

  • Mora Durocher

    • Los Alamos National Laboratory
    • Los Alamos National Lab

  • Matthew Freeman

    • Los Alamos National Laboratory
    • Los Alamos National Lab
    • Los Alamos Natl Lab

  • Verena Geppert-Kleinrath

    • Los Alamos National Laboratory
    • Los Alamos National Lab

  • Gary Saavedra

    • Los Alamos National Laboratory
    • Los Alamos National Lab

  • Carl Wilde

    • Los Alamos National Laboratory
    • Los Alamos National Lab