Signatures of Laser Imprint in OMEGA Cryogenic Implosions

ORAL

Abstract

The growth of single-beam nonuniformity or laser imprint can compromise target performance in direct-drive implosions. With increasing in-flight aspect ratio (IFAR is the ratio of the shell radius to shell thickness), the imprint front can penetrate through the shell, reducing the in-flight shell density. This results in a less-efficient piston for assembling the hot spot. The role of laser imprint on target performance is discussed in this presentation. Simulations of OMEGA cryogenic implosions with varying IFAR are presented. These DRACO simulations include a 3-D ray trace with the effect of cross-beam energy transfer, nonlocal heat conduction, and calculated first‑principles equations of state and opacities of the ablator and ice. Observables including ablation-surface trajectories, neutron yields, areal densities, neutron rates, ion temperatures, and hot-spot images are compared to experiment. Specific signatures including broadened neutron rates, reduced areal densities, and thicker shells relative to spherically symmetric simulations are presented.

–

Presenters

  • Radha Bahukutumbi

    Laboratory for Laser Energetics, Univ of Rochester

Authors

  • Radha Bahukutumbi

    Laboratory for Laser Energetics, Univ of Rochester

  • Ken S Anderson

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

  • R. Betti

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

  • E. M. M. Campell

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

  • Duc M Cao

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

  • Timothy J Collins

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

  • Timothy J Collins

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

  • Chad J. Forrest

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

  • S. X. Hu

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

  • James P Knauer

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

  • John A Marozas

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

  • Vladimir Yu Glebov

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

  • Valeri N Goncharov

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

  • Sean P Regan

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

  • Thomas C Sangster

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

  • Rahul C Shah

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

  • Alex Shvydky

    Laboratory for Laser Energetics, Univ of Rochester, Univ of Rochester, Univ of Rochester

  • Christian Stoeckl

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

  • Johan Frenje

    Massachusetts Inst of Tech-MIT, MIT

  • Maria Gatu Johnson

    Massachusetts Inst of Tech-MIT, Massachusetts Institute of Technology-MIT, PSFC, MIT

  • Richard David Petrasso

    Massachusetts Inst of Tech-MIT, MIT