Study of Stark Broadening of Krypton Helium-$\beta $ Lines and Estimation of Electron Density and Temperature in NIF Compressed Capsules

ORAL

Abstract

The dHIRES (DIM based high resolution) x-ray spectrometer measures Kr He$\alpha $ and He$\beta $ spectra from NIF compressed capsules with 12-eV spectral and 30-ps temporal resolution. Comparison of the measured Kr He$\beta $ spectra with theoretical line shapes provides a measure of the time history of the electron density, n$_{\mathrm{e}}$. Electron temperatures, T$_{\mathrm{e}}$, are inferred by comparison of ratios of Li-like to He-like Kr line intensities to calculations by SCRAM. Spatial profile effects are calculated by averaging assumed optically thin SCRAM spectra over spherical shells defined by n$_{\mathrm{e}}$(r) and T$_{\mathrm{e}}$(r) from LASNEX. Comparisons of measured spectra with SCRAM and CRETIN-TOTAL simulations will be shown.

* Work 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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Authors

  • K.W. Hill

    Princeton Plasma Physics Laboratory, PPPL

  • M. Bitter

    PPPL

  • L. Gao

    Princeton Plasma Physics Laboratory, PPPL

  • B.F. Kraus

    Princeton Plasma Physics Laboratory, Princeton Plasma Physics Lab, PPPL

  • P.C. Efthimion

    Princeton Plasma Physics Laboratory, PPPL

  • M.B. Schneider

    Lawrence Livermore Natl Lab, LLNL

  • D.B. Thorn

    Lawrence Livermore Natl Lab, LLNL

  • H. Chen

    LLNL, Lawrence Livermore Natl Lab

  • R.L. Kauffman

    LLNL

  • D.A. Liedahl

    LLNL

  • M.J. MacDonald

    Lawrence Livermore National Laboratory, LLNL

  • Andrew MacPhee

    Lawrence Livermore Natl Lab, LLNL

  • H.A. Scott

    Lawrence Livermore Natl Lab, LLNL

  • M.F. Gu

    UC Berkeley

  • R. Doron

    Weizmann Institute

  • E. Stambulchik

    Weizmann Institute

  • Y. Maron

    Weizmann Institute