Validation of energy coupling models using time-resolved scattered light data in polar direct drive experiments on the NIF

ORAL

Abstract

Time resolved scattered light data from polar direct drive (PDD)[1] experiments on the National Ignition Facility (NIF) using 2.1-mm diameter solid CH sphere targets have been analyzed to validate laser energy-to-target coupling models in 2-D radiation hydrodynamic simulations. Fourteen scattered light time history diagnostic (SLTD)[2] units and eight full aperture backscatter stations (FABS) are used to measure the time resolved scattered light in a narrow band around the incident laser wavelength of 351 nm. The measured scattered light intensity has been compared with data from the 2-D radiation hydrodynamic code DRACO, which includes the effects of cross beam energy transfer (CBET). DRACO overpredicts scattered light at early times. [WT1] At later times the scattered light predictions compared to experimental data to reveal trends that depend on pulse shape features[WT2] . These trends will be discussed further to tune DRACO in validating CBET models. The evaluation of time resolved scattered light and future development of 2D scattered light map reconstruction will be discussed.



[1] M. Hohenberger et al., Phys. Plasmas 22, 056308 (2015).


[2] M. J. Rosenberg et al., Rev. Sci. Instrum. 92, 033511 (2021)

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Presenters

  • Steven Kostick

    University of Rochester

Authors

  • Steven Kostick

    University of Rochester

  • Michael J Rosenberg

    University of Rochester Laboratory for Laser Energetics (LLE), Laboratory for Laser Energetics, University of Rochester, University of Rochester

  • P. B Radha

    Los Alamos National Laboratory, University of Rochester

  • John A Marozas

    Laboratory for Laser Energetics, University of Rochester

  • Duc M Cao

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

  • Nuno Lemos

    Lawrence Livermore Natl Lab

  • Wolfgang Theobald

    Focused Energy, Focused Energy GmbH, University of Rochester

  • Kenneth S Anderson

    Laboratory for Laser Energetics, University of Rochester

  • Joseph D Katz

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

  • Timothy Filkins

    LLE

  • Timothy J Collins

    Laboratory for Laser Energetics, University of Rochester

  • Luke A Ceurvorst

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

  • Ellie Tubman

    Lawrence Livermore Natl Lab

  • Henry J Meyer

    Lawerence Livermore National Laberatory

  • George F Swadling

    Lawrence Livermore Natl Lab, Lawrence Livermore Natl Laboratory

  • Jose Hernandez

    Lawrence Livermore Natl Lab

  • Joel Stanley

    Lawrence Livermore Natl Lab

  • James S Ross

    Livermore, Lawrence Livermore Natl Lab

  • Sean P Regan

    Laboratory for Laser Energetics, University of Rochester