First refraction enhanced radiography experiments for probing inflight density profiles of ICF capsule implosions

POSTER

Abstract

Possible explanations for reduced compression of deuterium-tritium (DT) fuel capsule implosions on the National Ignition Facility are higher than expected ablator preheat that can increase the ablator-DT ice density jump and induce mix, more high-mode interface mix, and unexpected strength of reverberating shocks. We have hence implemented 8 keV streaked x-ray refraction enhanced radiography to infer the inflight density profiles in indirectly-driven TH layered fuel capsule implosions. The first data taken at 5 µm, 25 ps resolution reveal sharp fringe features associated with the ablation front, shocks and ice-ablator interface that are not visible in traditional absorption radiographs. The inferred density profiles will be compared to simulations.

Presenters

  • Eduard L. Dewald

    Lawrence Livermore Natl Lab

Authors

  • Eduard L. Dewald

    Lawrence Livermore Natl Lab

  • Otto L Landen

    Lawrence Livermore Natl Lab, Lawrence Livermore National Laboratory

  • Laurent Pierre Masse

    Lawrence Livermore Natl Lab

  • Darwin Morris Ho

    Lawrence Livermore Natl Lab, Lawrence Livermore Natl Lab, Lawrence Livermore Natl Lab

  • Yuan Ping

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

  • Daniel B. Thorn

    Lawrence Livermore Natl Lab, Lawrence Livermore National Laboratory

  • Nobuhiko Izumi

    Lawrence Livermore Natl Lab, Lawrence Livermore Natl Lab, Lawrence Livermore Natl Lab, Lawrence Livermore National Laboratory

  • Laura F. Berzak Hopkins

    Lawrence Livermore Natl Lab

  • Jeremy Kroll

    Lawrence Livermore Natl Lab

  • Abbas Nikroo

    Lawrence Livermore Natl Lab, Lawrence Livermore Natl Lab, Lawrence Livermore Natl Lab

  • Jeffrey Allan Koch

    Natl Security Technologies LLC