Laser/x-ray coupling in the first NIF beryllium implosions

ORAL

Abstract

The x-ray flux driving a capsule is currently overestimated in standard Hydra high-flux model (Rosen \textit{et al.,} HEDP \textbf{7},180 (2011)) calculations of gas-filled hohlraums. Jones \textit{et al.} (Phys. Plasmas,\textbf{19},056315 (2012)) introduced time dependent multipliers to reduce the laser drive and achieve an appropriate radiation drive on NIF capsules. Using shock velocities from VISAR capsule experiments, symmetry capsule implosion times with truncated laser pulses, and time dependent DANTE X-ray flux measurements from 1D and 2D convergent ablator implosions, we derived a set of time dependent flux multipliers for the first NIF cryogenically layered beryllium capsule implosion. The similarity between these multipliers for both plastic and beryllium capsules suggests that they are primarily correcting for improper modeling of the hohlraum physics, with possibly some residual contribution from capsule modeling deficiencies. Using Lasnex we have adjusted hohlraum physics and resolution in an attempt to model these implosions without drive multipliers.

–

Authors

  • D.C. Wilson

    Los Alamos National Laboratory, LANL

  • J.L. Kline

    Los Alamos National Laboratory

  • S.A. YI

    LANL, Los Alamos National Laboratory

  • A.N. Simakov

    LANL, Los Alamos National Laboratory, Los Alamos Natl Lab

  • R.E. Olson

    LANL, Los Alamos National Laboratory

  • G.A. Kyrala

    Los Alamos National Laboratory

  • T.S. Perry

    Los Alamos National Laboratory

  • S. Batha

    LANL, Los Alamos National Laboratory

  • D.A. Callahan

    Lawrence Livermore National Laboratory

  • E.L. Dewald

    Lawrence Livermore National Laboratory, Lawrence Livermore Natl Lab

  • O. Jones

    LLNL, Lawrence Livermore National Laboratory

  • D.E. Hinkel

    Lawrence Livermore Natl Lab, LLNL, Lawrence Livermore National Laboratory

  • Omar Hurricane

    Lawrence Livermore National Laboratory, Lawrence Livermore Natl Lab

  • N. Izumi

    Lawrence Livermore National Laboratory

  • A.G. MacPhee

    Lawrence Livermore National Laboratory, Lawrence Livermore Natl Lab

  • J.L. Milovich

    Lawrence Livermore National Laboratory, Lawrence Livermore Natl Lab, LLNL

  • J. Ralph

    LLNL, Lawrence Livermore National Laboratory, Lawrence Livermore Natl Lab

  • J.R. Rygg

    LLNL, Lawrence Livermore National Laboratory

  • M.B. Schneider

    Lawrence Livermore Natl Lab, Lawrence Livermore National Laboratory

  • D. Strozzi

    LLNL, Lawrence Livermore National Laboratory

  • C.A. Thomas

    Lawrence Livermore National Laboratory, LLNL

  • R. Tommasini

    Lawrence Livermore National Laboratory