Mixing at the Fuel--Ablator Interface in Backlit OMEGA Cryogenic Implosions

ORAL

Abstract

OMEGA cryogenic target implosions show a performance boundary correlated with acceleration-phase shell stability. Direct evidence that this is caused by Rayleigh$-$Taylor fuel--ablator mixing was previously obtained using a backlighter driven by a short pulse generated by OMEGA EP. The radiographic shadow cast by the shell shortly prior to stagnation shows significantly more absorption than post-processed clean simulations predict, evidence of ablator--fuel mix for an unstable implosion ($\alpha $~\textasciitilde ~1.9, IFAR~$=$~14). We show comparison of synthetic radiographs from \textit{DRACO }simulations investigating imprint and other mechanisms such as isolated surface perturbations and uncertainties in the mass ablation rate for reproducing experimental signatures of mix. 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

  • Tim Collins

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

  • 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

  • R. Epstein

    University of Rochester

  • Samuel Miller

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

  • K. S. Anderson

    University of Rochester

  • 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

  • C.J. Forrest

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

  • D. W. Jacobs-Perkins

    University of Rochester

  • T. Z. Kosc

    University of Rochester

  • O. M. Mannion

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

  • John Marozas

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

  • S. F. B. Morse

    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

  • P. B. Radha

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

  • Craig Sangster

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

  • Maria Gatu Johnson

    MIT, Massachusetts Institute of Technology, PSFC, MIT

  • J.A. Frenje

    MIT, MIT PSFC, Massachusetts Institute of Technology, PSFC, MIT

  • R. Petrasso

    Massachusetts Institute of Technology, PSFC, MIT, MIT