Time-Resolved Measurements of the Hot Spot Density and Temperature on the National Ignition Facility

ORAL

Abstract

The electron density and temperature and their evolution in the hot spot of a Kr-doped, big-foot implosion target were measured for the first time using an absolutely calibrated, streaked, high-resolution x-ray spectrometer on the National Ignition Facility (NIF). Kr Heα and Heβ complexes near stagnation were recorded on a streak camera with a temporal resolution of ~30 ps, with signal levels provided by a simultaneous time-integrated measurement on the image plate. The electron density was inferred through stark-broadened line shapes and the temperature was derived from the relative intensities of dielectronic satellites. The measurements are compared with hydrodynamic simulations of the big-foot implosion, as well as collisional-radiative calculations for line intensities and shapes.

*This work was performed under the auspices of the U.S. Department of Energy by Princeton Plasma Physics Laboratory under contract DE-AC02-09CH11466 and by Lawrence Livermore National Laboratory under contract DE-AC52-07NA27344.

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Presenters

  • Lan Gao

    • Princeton Plasma Physics Lab
    • Princeton Plasma Physics Laboratory

Authors

  • Lan Gao

    • Princeton Plasma Physics Lab
    • Princeton Plasma Physics Laboratory

  • Brian F Kraus

    • Princeton University
    • Princeton Plasma Physics Lab
    • Princeton Plasma Physics Laboratory

  • K. Wayne Hill

    • Princeton Univ
    • Princeton Plasma Physics Lab
    • Princeton Plasma Phys Lab
    • Princeton Plasma Physics Laboratory

  • M. Bitter

    • Princeton Plasma Physics Lab
    • Princeton Plasma Physics Laboratory

  • P. Efthimion

    • Princeton Plasma Physics Laboratory

  • Marilyn Beth Schneider

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

  • C. A Thomas

    • Lawrence Livermore Natl Lab
    • Lawrence Livermore National Laboratory

  • Robert L Kauffman

    • Lawrence Livermore Natl Lab
    • Lawrence Livermore National Laboratory

  • Daniel B. Thorn

    • Lawrence Livermore Natl Lab
    • Lawrence Livermore National Laboratory

  • Andrew G. MacPhee

    • Lawrence Livermore Natl Lab
    • Lawrence Livermore National Laboratory

  • D. A Liedahl

    • Lawrence Livermore Natl Lab
    • Lawrence Livermore National Laboratory