Spectrally Resolved Imaging of X-Ray Self Emission from NIF Implosions

ORAL

Abstract

Accurately assessing and optimizing the implosion performance of inertial confinement fusion capsules is a crucial step to achieving ignition on the NIF. We have applied differential filtering (matched Ross filter pairs) to provide spectrally resolved time-integrated absolute emission images of the imploded core of cryogenic layered targets. By limiting the spectral range of imaging, we can diagnose the hydrodynamic mix of Ge-doped ablator mass within the hot spot, core symmetry without interpenetration mix, shell assembly, and distribution of temperature and hot spot mass. Further, the measured brightness of Ge K-shell emission and bremsstrahlung allows for the inference of burn-weighted electron temperature, hot spot mass, rhoR, density, and pressure. Experimental results and a simple hot spot pressure model will be presented.

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Authors

  • T. Ma

    Lawrence Livermore National Laboratory, Lawrence Livermore National Lab

  • N. Izumi

    Lawrence Livermore National Laboratory, Lawrence Livermore National Labl, Lawrence Livermore National Lab.

  • D.K. Bradley

    LLNL, Lawrence Livermore National Laboratory, Lawrence Livermore National Lab

  • C. Cerjan

    Lawrence Livermore National Laboratory

  • S.N. Dixit

    Lawrence Livermore National Laboratory, Lawrence Livermore National Lab

  • O. Landen

    Lawrence Livermore National Laboratory, LLNL, Lawrence Livermore National Lab

  • A.J. Mackinnon

    Lawrence Livermore National Laboratory, LLNL

  • N.B. Meezan

    Lawrence Livermore National Laboratory, Lawrence Livermore National Lab, LLNL

  • R.R. Prasad

    Lawrence Livermore National Laboratory

  • P. Springer

    Lawrence Livermore National Laboratory

  • R.P.J. Town

    Lawrence Livermore National Laboratory, Lawrence Livermore National Lab, LLNL

  • S.V. Weber

    Lawrence Livermore National Laboratory, Lawrence Livermore National Lab, LLNL

  • Siegfried Glenzer

    LLNL, Lawrence Livermore National Laboratory, Lawrence Livermore National Lab

  • J.L. Kline

    Los Alamos National Laboratory, LANL

  • G. Kyrala

    Los Alamos National Laboratory, Lawrence Livermore National Laboratory, LANL