Exploring 3D radiation asymmetries in inertial confinement fusion hohlraums with a dynamic view factor model

ORAL

Abstract

Inertial confinement fusion (ICF) experiments at the National Ignition Facility (NIF) seek to drive a spherical deuterium-tritium target to high temperatures and pressures. Fusion performance is significantly affected by the symmetry of the radiation environment produced inside the cylindrical hohlraum enclosure driven by 192 laser beams. Presently, full 3D ICF radiation-hydrodynamic calculations with sufficient resolution are very computationally expensive, limiting their utility. We combine a view factor model [1] with dynamic data from 1D and 2D radiation-hydrodynamic simulations [2] to rapidly assess the impact of drive asymmetry arising from a variety of sources across a range of NIF experiments. Special attention is given to measured laser power imbalance and the ablated hohlraum wall plasma (“gold bubble”) that interferes with inner laser beam propagation and symmetry control in the latter half of ICF experiments.

[1] J. J. MacFarlane, J. Quant. Spectr. Rad. Transfer 81, 287 (2003)

[2] M. M. Marinak, et al., Phys. Plasmas 8, 2275 (2001)

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Presenters

  • Chris V Young

    Lawrence Livermore National Laboratory, Lawrence Livermore Natl Lab

Authors

  • Chris V Young

    Lawrence Livermore National Laboratory, Lawrence Livermore Natl Lab

  • Nathan B. Meezan

    Lawrence Livermore Natl Lab, Lawrence Livermore National Laboratory

  • Daniel T Casey

    Lawrence Livermore Natl Lab, Lawrence Livermore National Laboratory

  • Debra Ann Callahan

    Lawrence Livermore National Laboratory, Lawrence Livermore Natl Lab, LLNL

  • Nobuhiko Izumi

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

  • John D Moody

    Lawrence Livermore Natl Lab, Lawrence Livermore National Laboratory

  • Joseph E Ralph

    Lawrence Livermore Natl Lab, Lawrence Livermore National Laboratory