Development of a High Resolution X-Ray Spectrometer for the National Ignition Facility (NIF)

ORAL

Abstract

A high resolution (E/$\Delta $E \textasciitilde 2000) Bragg crystal x-ray spectrometer is being developed to measure plasma parameters in NIF experiments. The instrument will be a positioner insertable cassette designed to infer electron density in compressed capsules from Stark broadening of the helium-$\beta $ (1s$^{\mathrm{2}}$-1s3p) lines of krypton, and electron temperature from the relative intensities of dielectronic satellites. Two conically shaped crystals will diffract and sagittally focus (1) the Kr He$\beta $ complex and (2) the He$\alpha $ and Ly$\alpha $ complexes onto a streak camera photocathode for time resolved measurement. A third cylindrical crystal will focus the full He$\alpha $ to He$\beta $ spectrum onto an image plate for a time integrated calibration spectrum. Performance estimates and design status will be presented.

*Performed under the auspices of the US DOE by PPPL under contract DE-AC02-09CH11466 and by LLNL under contract DE-AC52-07NA27344

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Authors

  • Ken Hill

    • Princeton Plasma Physics Laboratory
    • PPPL
    • Princeton Plasma Physics Lab.

  • M. Bitter

    • PPPL

  • L. Delgado-Aparicio

    • PPPL

  • P.C. Efthimion

    • PPPL

  • R. Ellis

    • PPPL

  • L. Gao

    • PPPL

  • J. Maddox

    • PPPL

  • N.A. Pablant

    • PPPL

  • M.B. Schneider

    • LLNL

  • H. Chen

    • LLNL

  • S. Ayers

    • LLNL

  • R.L. Kauffman

    • LLNL

  • A.G. MacPhee

    • LLNL

  • P. Beiersdorfer

    • LLNL

  • T. Ma

    • LLNL

  • R.C. Nora

    • LLNL

  • H.A. Scott

    • LLNL

  • D.B. Thorn

    • LLNL

  • J.D. Kilkenny

    • General Atomics

  • D. Nelson

    • LLE

  • M. Shoup III

    • LLE

  • Y. Maron

    • Weizmann Institute of Science