Surface Roughness Impact on Double Shell Target Designs

ORAL

Abstract

Double shell targets on the National Ignition Facility (NIF) provide for an alternative path to robust burn1. The target relies upon kinetic energy transfer from an ablator to a high Z and high-density pusher that is adjacent to the fuel. This has the advantage of achieving burn conditions in DT gas with a lower convergence and internal temperature compared to single shell designs. With the multiple layers with large density jumps, hydrodynamic instability growth is a concern. This work will examine the impact of surface roughness on the performance of two different double shell designs. The first is an 1100µm outer radius target inside a cylindrical hohlraum, and the second is a 1510µm outer radius target inside a rugby hohlraum. Due to differences in the maximum temperature in the hohlraum, the targets are driven differently, which affects the overall performance. In addition to impacts of the surface roughness, several mitigation strategies are investigated, including changing the tamper material, foam density, and foam composition.

  1. 1. P. Amendt, et al., Physics of Plasmas 9, 2221 (2002)

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Presenters

  • Ryan Sacks

    Los Alamos National Laboratory

Authors

  • Ryan Sacks

    Los Alamos National Laboratory

  • Eric Loomis

    Los Alamos Natl Lab, Los Alamos National Laboratory

  • Elizabeth Merritt

    Los Alamos Natl Lab, Los Alamos National Laboratory

  • William S Daughton

    Los Alamos Natl Lab, Los Alamos National Laboratory, LANL

  • David S Montgomery

    Los Alamos Natl Lab, Los Alamos National Laboratory

  • Douglas Carl Wilson

    Los Alamos National Laboratory

  • Joshua P Sauppe

    Los Alamos Natl Lab, Los Alamos National Laboratory, Los Alamos National Lab

  • Evan Dodd

    Los Alamos Natl Lab, Los Alamos National Laboratory

  • Sasi Palaniyappan

    Los Alamos National Laboratory, Los Alamos Natl Lab, Los Alamos National Lab

  • Tana Cardenas

    Los Alamos Natl Lab, Los Alamos National Laboratory, LANL

  • Willow Wan

    Los Alamos National Laboratory

  • John L Kline

    Los Alamos National Laboratory, Los Alamos Natl Lab, Los Alamos National Lab

  • Steven Howard Batha

    Los Alamos Natl Lab, Los Alamos National Laboratory

  • Peter Andrew Amendt

    Lawrence Livermore Natl Lab

  • Robert E Tipton

    Lawrence Livermore Natl Lab

  • Vladimir Smalyuk

    Lawrence Livermore Natl Lab, Lawrence Livermore National Laboratory

  • Yuan Ping

    LLNL, Lawrence Livermore National Laborator, Lawrence Livermore Natl Lab, Lawrence Livermore National Laboratory, Lawrence Livermore National Lab