\textbf{Hot-Spot Flow Velocity in Laser-Direct-Drive Inertial Confinement Fusion Implosions}

ORAL

Abstract

Multidimensional effects on the hot-spot formation of laser-direct-drive inertial confinement fusion implosions can lead to an anisotropic hot-spot flow velocity and incomplete stagnation. The first and second moments of the primary DT fusion neutron peak, recorded with four neutron time-of-flight detectors positioned around the target chamber in quasi-orthogonal diagnostic lines of sight, are analyzed to infer the hot-spot flow velocity and the ion temperature of implosions on the 60-beam, 30-kJ, 351-nm OMEGA laser. The possible physical degradation mechanisms (e.g., initial target offset, target stalk orientation, and nonuniformities in the target and the laser drive) leading to a hot-spot flow velocity in implosions of DT cryogenic targets and DT gas-filled plastic shells will be presented. Correlations of the hot-spot flow velocity with gated x-ray images of the hot spot recorded along multiple lines of sight and of in-flight asymmetries of the imploding shell will be examined. A hot-spot flow velocity of 50 to 150 km/s is observed to point in the direction of the maximum inferred ion temperature. This material is based upon work supported by the DOE National Nuclear Security Administration under Award Number DE-NA0003856.

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Authors

  • 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

  • Owen Mannion

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

  • Chad Forrest

    Laboratory for Laser Energetics, University of Rochester

  • J.P. Knauer

    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

  • Riccrado Betti

    University of Rochester, 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

  • Michael Campbell

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

  • D. Cao

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

  • V.Yu. Glebov

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

  • 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

  • S. Ivancic

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

  • F.J. Marshall

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

  • Craig Sangster

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

  • R. C. Shah

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

  • C. Sorce

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

  • C. Stoeckl

    University of Rochester, University of Rochester - LLE, Laboratory for Laser Energetics, University of Rochester, Laboratory for Laser Energetics, Laboratory for Laser Energetics, U. of Rochester, University of Rochester, NY 14623, USA

  • Wolfgang Theobald

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