Observation of bright spots on x-ray image of imploded core with combination of a spectrally resolved and a temporally gated x-ray imager

ORAL

Abstract

To measure drive asymmetry, we use surrogate capsules made of plastic resin. However, small bright spots are often observed in the x-ray images of the imploded core. It is believed that those spots are caused by hydrodynamic instabilities initiated by initial perturbations on the capsule. To investigate mechanisms of the spot formation, we observed the core emission with combination of a spectrally resolved imager and a temporally resolved x-ray imager. Comparing those images, we found the spots observed before maximum compression are dominated by germanium line emission. In contrast, spots emerge after maximum compression is dominated by Bremsstrahlung below 9 keV. The observed difference in spectral contents is suggesting different mechanisms of the spot formation. The experimental images and mechanisms of the bright spot formation will be presented.

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Authors

  • G. Kyrala

    Los Alamos National Laboratory, Lawrence Livermore National Laboratory, LANL

  • N. Izumi

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

  • B. Hammmel

    Lawrence Livermore National Laboratory

  • T. Ma

    Lawrence Livermore National Laboratory, Lawrence Livermore National Lab

  • M.A. Barrios

    Lawrence Livermore National Laboratory

  • R.L. Benedetti

    Lawrence Livermore National Laboratory, Lawrence Livermore National Lab

  • S.M. Glenn

    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

  • Debra Callahan

    Lawrence Livermore National Lab, LLNL

  • N.B. Meezan

    Lawrence Livermore National Laboratory, Lawrence Livermore National Lab, LLNL

  • S.W. Haan

    Lawrence Livermore National Laboratory, Lawrence Livermore National Lab

  • M.J. Edwards

    Lawrence Livermore National Laboratory, LLNL

  • O. Landen

    Lawrence Livermore National Laboratory, LLNL, Lawrence Livermore National Lab

  • J. Kilkenny

  • S.N. Dixit

    Lawrence Livermore National Laboratory, Lawrence Livermore National Lab

  • J.L. Kline

    Los Alamos National Laboratory, LANL

  • L. Suter

    Lawrence Livermore National Laboratory, Lawrence Livermore National Lab

  • Siegfried Glenzer

    LLNL, Lawrence Livermore National Laboratory, Lawrence Livermore National Lab

  • M.H. Key

    LLNL, Lawrence Livermore National Laboratory

  • A.J. Mackinnon

    Lawrence Livermore National Laboratory, LLNL

  • P.M. Bell

    Lawrence Livermore National Laboratory

  • D.K. Bradley

    LLNL, Lawrence Livermore National Laboratory, Lawrence Livermore National Lab