Hot Electron Generation Mechanisms in Ignition-Scale Direct-Drive Coronal Plasmas on the NIF

ORAL

Abstract

Planar experiments at the NIF have diagnosed laser-plasma interactions and hot-electron production at plasma conditions uniquely relevant to direct-drive ignition designs, in which hot electrons could potentially preheat the capsule. Stimulated Raman scattering (SRS) is observed at the quarter-critical density and at lower densities. Comparison of hard x-ray and SRS signatures indicates a correlation between underdense SRS and hot electron generation, though the saturated absolute SRS instability at quarter-critical may contribute as well. Measurements of 3$\omega $/2 emission provide information about SRS and two-plasmon decay plasma waves near quarter-critical. LPSE and PIC modeling support interpretation of the experimental findings. These results are used to assess where in the density profile and through which physical mechanisms hot electrons are produced, which guides hot-electron preheat mitigation strategies for direct-drive--ignition designs. This material is based upon work supported by the Department of Energy National Nuclear Security Administration under Award Number DE-NA0003856.

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Authors

  • M.J. Rosenberg

    U. of Rochester's Laboratory for Laser Energetics, LLE, University of Rochester, Laboratory for Laser Energetics, Laboratory for Laser Energetics, University of Rochester, Laboratory for Laser Energetics, U. of Rochester, Laboratory for Laser Energetics, University of Rochester

  • Andrey Solodov

    Laboratory for Laser Energetics, University of Rochester, Univ of Rochester, University of Rochester

  • Wolf Seka

    Laboratory for Laser Energetics, University of Rochester, Laboratory for Laser Energetics

  • Russ Follett

    Laboratory for Laser Energetics, Laboratory for Laser Energetics, University of Rochester, University of Rochester, LLE rochester

  • A. V. Maximov

    Laboratory for Laser Energetics, University of Rochester, Laboratory for Laser Energetics, University of Rochester, University of Rochester, NY 14623, USA

  • Chuang Ren

    Laboratory for Laser Energetics, University of Rochester

  • Shihui Cao

    Laboratory for Laser Energetics, University of Rochester

  • Sean Regan

    LLE, University of Rochester, Laboratory for Laser Energetics, University of Rochester - LLE, University of Rochester, Laboratory for Laser Energetics, U. of Rochester, Laboratory for Laser Energetics, University of Rochester, Laboratory for Laser Energetics

  • Radha Bahukutumbi

    LLE, University of Rochester, University of Rochester - LLE, Laboratory for Laser Energetics, University of Rochester, Laboratory for laser Energetics, University of Rochester, Laboratory for Laser Energetics, U. of Rochester, Laboratory for Laser Energetics

  • Tim Collins

    LLE, University of Rochester, University of Rochester - LLE, Laboratory for Laser Energetics, University of Rochester, Laboratory for Laser Energetics

  • D.H. Froula

    Laboratory for Laser Energetics, Laboratory for Laser Energetics, University of Rochester, University of Rochester, LLE rochester, University of Rochester, Laboratory for Laser Energetics

  • J.P. Palastro

    Laboratory for Laser Energetics, Laboratory for Laser Energetics, U. of Rochester, Laboratory for Laser Energetics, University of Rochester, University of Rochester, University of Rochester, Laboratory for Laser Energetics

  • V. N. Goncharov

    Laboratory for Laser Energetics, University of Rochester, Laboratory for Laser Energetics, University of Rochester - LLE, Laboratory for Laser Energetics, University of Rochester, Laboratory for Laser Energetics, U. of Rochester, University of Rochester, Laboratory for laser Energetics, University of Rochester

  • Jason Myatt

    University of Alberta

  • P. Michel

    Lawrence Livermore National Laboratory, LLNL, Lawrence Livermore Natl Lab

  • Matthias Hohenberger

    Lawrence Livermore Natl Lab, Lawrence Livermore National Laboratory, LLNL

  • George Swadling

    Lawrence Livermore National Laboratory, Lawrence Livermore National Lab, LLNL

  • James Ross

    Lawrence Livermore Natl Lab, Lawrence Livermore National Laboratory

  • Robbie Scott

    STFC Rutherford Appleton Laboratory, Rutherford Appleton Laboratory

  • Kevin Glize

    STFC Rutherford Appleton Laboratory, Rutherford Appleton Laboratory