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SAGE Hydrodynamic Simulations of Scattered Light from Direct-Drive Implosions of Large-Diameter Targets at the National Ignition Facility

ORAL

Abstract

The 2-D hydrodynamics code SAGE, which includes 3-D ray tracing, has been used to model scattered light from polar-direct-drive implosions at the National Ignition Facility. Predictions have been compared with the full-aperture backscatter station (FABS) diagnostic and the scattered-light time-history diagnostic (SLTD).[1],[2] For a shot with a picket pulse, the three-peaked predicted scattered-light time history agrees closely in an absolute comparison with the FABS (Q36B) at 50° from the south pole; analysis of the simulations shows which laser beams contribute unabsorbed light to the detector at different times. Predictions of the angular dependence are generally consistent with the SLTD diagnostics. For a 4-mm CH low-convergence implosion (N190227-001),[3] FABS measurements are consistent with the predicted absorption of ~95%. Ongoing improvements to the absolute calibration will allow these detectors to more tightly constrain hydrodynamic modeling. This material is based upon work supported by the Department of Energy National Nuclear Security Administration under Award Number DE-NA0003856.

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


[2] S. Kostick et al., this meeting.


[3] C. B. Yeamans et al., Nucl. Fusion 61, 046031 (2021).





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Presenters

  • Stephen Craxton

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

Authors

  • Stephen Craxton

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

  • Steven Kostick

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

  • Michael J Rosenberg

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

  • Anirudh Sharma

    University of Rochester, Cornell University

  • Emma M Garcia

    University of Rochester

  • Radha P Bahukutumbi

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

  • John A Marozas

    Laboratory for Laser Energetics, University of Rochester

  • T. Filkins

    LLE, Lab for Laser Energetics, Laboratory for Laser Energetics, University of Rochester, Rochester, New York, USA, University of Rochester, Laboratory for Laser Energetics, University of Rochester

  • Wolfgang R Theobald

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

  • Joseph D Katz

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

  • Timothy J Collins

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

  • Sean P Regan

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

  • Nuno Lemos

    Lawrence Livermore Natl Lab, LLNL, Lawrence Livermore National Laboratory

  • Eleanor Tubman

    Lawrence Livermore Natl Lab

  • Steven S Ross

    Lawrence Livermore Natl Lab, Lawrence Livermore National Laboratory

  • Neil Butler

    Lawrence Livermore Natl Lab

  • George F Swadling

    Lawrence Livermore National Laboratory, Lawrence Livermore Natl Lab

  • Ricky Sommers

    Lawrence Livermore Natl Lab

  • Joel Stanley

    Lawrence Livermore Natl Lab

  • John D Moody

    Lawrence Livermore National Laboratory, Lawrence Livermore Natl Lab

  • Charles B Yeamans

    Lawrence Livermore Natl Lab