Hybrid C Campaign: Optimizing Implosions With CH Ablators at the National Ignition Facility

ORAL

Abstract

Recent work on ICF implosions using CH ablators at the National Ignition Facility (NIF) includes key optimizations relevant to not just CH implosions, but also to implosions with other ablators, such as HDC and Be. Utilizing low levels of wavelength separation between the inner and outer beams, i.e., cross-beam energy transfer at low values of Δλ ~ 1 Å, the Hybrid C campaign has demonstrated a change in P2 symmetry from oblate to prolate of over 20 µm, corresponding to an increase in inner beam intensity by a factor of 1.3. Energy coupling remains high (> 97%), with low levels of backscatter, SBS fluence, and hot electrons.

The capsule is further optimized in two ways. First, capsule dopant levels (Si) will increase, to further shield against M-band at high power (see talk by T. Döppner, LLNL). Also, to reduce oxygen uptake (S. Ali, PoP, May, 2018) the capsule is flash coated with aluminum. Results from the Hybrid C campaign will be presented along with future plans to explore generic optimization strategies. A design for a scale-up in capsule size by a factor of 1.1 will also be discussed.

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Presenters

  • Denise E Hinkel

    Lawrence Livermore National Laboratory, Lawrence Livermore Natl Lab

Authors

  • Denise E Hinkel

    Lawrence Livermore National Laboratory, Lawrence Livermore Natl Lab

  • Tilo Doeppner

    Lawrence Livermore Natl Lab

  • Laurent Pierre Masse

    Lawrence Livermore National Laboratory, LLNL, Livermore, CA 94550, USA, Lawrence Livermore Natl Lab

  • Joseph E Ralph

    Lawrence Livermore Natl Lab, Lawrence Livermore National Laboratory

  • Louisa A Pickworth

    Lawrence Livermore Natl Lab

  • Benjamin Bachmann

    Lawrence Livermore Natl Lab, Lawrence Livermore National Lab

  • Laurent Divol

    Lawrence Livermore Natl Lab, Lawrence Livermore National Laboratory

  • Annie Kritcher

    Lawrence Livermore Natl Lab

  • Marius Adrien Millot

    Lawrence Livermore Natl Lab

  • Pierre Michel

    Lawrence Livermore Natl Lab

  • Peter M Celliers

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

  • Jaebum Park

    Lawrence Livermore Natl Lab

  • Hui Chen

    Lawrence Livermore Natl Lab, Lawrence Livermore National Laboratory

  • Félicie Albert

    Lawrence Livermore Natl Lab, Lawrence Livermore National Lab

  • Matthias Hohenberger

    Lawrence Livermore Natl Lab, Lawrence Livermore National Laboratory

  • Debra Ann Callahan

    Lawrence Livermore National Laboratory, Lawrence Livermore Natl Lab, LLNL

  • Omar A Hurricane

    Lawrence Livermore National Laboratory, Lawrence Livermore Natl Lab