Integrated P1 Hohlraum/Capsule Simulations for NIF Experiments

ORAL

Abstract

We discuss integrated hohlraum/capsule post-shot simulations of two full-scale cryogenic NIF experiments that drove a DT symcap capsule downward/upward by having the peak power in the upper laser beams 16{\%} greater/less than the lower beams. This laser asymmetry results in a radiation drive P1/P0 at the capsule ablation surface of $\sim$ 2{\%} and a downward/upward capsule velocity of order 100 microns/ns in agreement with the data. The experimental velocity is determined by comparing measurements at different locations of both the arrival times of DD and DT neutrons at time-of-flight detectors, and by zirconium activation measurements that are a function of neutron energy. We compare these two shots to a control shot for the same target with no specified laser asymmetries. We also discuss simulations of planned sub-scale warm symcap experiments that have a goal of measuring DT and DD ion temperatures and the electron temperature as a function of the imposed P1 to characterize the role of non-thermal velocity on temperature measurements.

*This work performed under the auspices of the U.S. Department of Energy by LLNL under Contract DE-AC52-07NA27344. LLNL-ABS-656659

Authors

  • David Eder

    • Lawrence Livermore National Laboratory
  • Brian Spears

    • Lawrence Livermore National Lab
    • Lawrence Livermore National Laboratory
    • LLNL
  • R.P.J. Town

    • Lawrence Livermore National Laboratory
    • Lawrence Livermore National Laboratory, Livermore, CA 94550
    • Lawrence Livermore Natl Lab
    • LLNL
  • Oggie Jones

    • LLNL
    • Lawrence Livermore National Laboratory
    • Lawrence Livermore National laboratory
    • Lawrence Livermore Natl Lab
  • T. Ma

    • Lawrence Livermore National Laboratory
    • Lawrence Livermore Nat'l Lab
    • LLNL
  • A. Pak

    • Lawrence Livermore National Laboratory
    • LLNL
  • L. Benedetti

    • Lawrence Livermore National Laboratory
    • Lawrence Livermore Natl Lab
    • LLNL
  • Steve Hatchett

    • Lawrence Livermore National Laboratory
  • James Knauer

    • Lawrence Livermore National Laboratory
  • Andy Mackinnon

    • LLNL
    • Lawrence Livermore National Laboratory
  • Charles Yeamans

    • Lawrence Livermore National Laboratory
  • James McNaney

    • Lawrence Livermore National Laboratory
  • D.T. Casey

    • LLNL
    • Lawrence Livermore National Laboratory