Modeling the Effects of Ion Viscosity on the Dynamics of OMEGA Direct-Drive Cryogenic Implosions

ORAL

Abstract

The hot-spot--ignition concept in inertial confinement fusion utilizes laser-driven implosions of spherical shell targets with DT ice as a fuel. Estimates of the physical conditions before and during the formation of the center hot spot in OMEGA-scale implosions reveal that the Knudson number can approach unity in the low-density interior of targets, indicating the potential importance of kinetic effects. To investigate these effects, cryogenic OMEGA implosions were simulated using the 3D hydrodynamic code ASTER, which includes the ion viscosity model assuming the Spitzer ion free path. The dependences of simulations results on the exact implementation of the viscosity model, including the effects of momentum and heat-flux limitations and using the energy conservation scheme, are studied. 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

  • Iogr Igumenshchev

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

  • Owen Mannion

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

  • James Knauer

    Laboratory for Laser Energetics, U. of Rochester, 4Laboratory for Laser Energetics, Laboratory for Laser Energetics, LLE-UR, University of Rochester, Lab for Laser Energetics

  • R. Betti

    Laboratory for Laser Energetics, U. of Rochester, LLE, University of Rochester, LLE, Univ. of Rochester, Laboratory for Laser Energetics, University of Rochester, Lab for Laser Energetics

  • E. M. Campbell

    University of Rochester, Laboratory for Laser Energetics, Laboratory for Laser Energetics, University of Rochester, LLE, Univ. of Rochester, Lab for Laser Energetics

  • D. Cao

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

  • Valeri Goncharov

    Lab for Laser Energetics

  • Varchas Gopalaswamy

    Lab for Laser Energetics

  • D. Patel

    University of Rochester, Lab for Laser Energetics

  • Sean Regan

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

  • Rahul Shah

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

  • A. Shvydky

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

  • Wolfgang Theobald

    University of Rochester, Lab for Laser Energetics, Laboratory for Laser Energetics, LLE, LLE, Univ. of Rochester, Laboratory for Laser Energetics, U. of Rochester, Laboratory for Laser Energetics, University of Rochester

  • Dan Clark

    Lawrence Livermore Natl Lab, LLNL

  • Marty Marinak

    Lawrence Livermore National Laboraotry, LLNL

  • Brian Haines

    Los Alamos National Laboratory, Los Alamos Natl Lab, LANL