Achieving high hot-spot pressures with 0.9scale CH capsule implosions at the National Ignition Facility*

ORAL

Abstract

We are reporting on a series of indirect-drive 0.9scale CH capsule implosions (inner radius = 840 μm) fielded in low gas-fill (0.6 mg/cm3) hohlraums of 6.72 mm diameter. Thanks to the increase in case-to-capsule ratio we achieved good hot spot symmetry control near 33% cone-fraction and zero wavelength separation. As a result, we demonstrated hot spot pressures approaching 300 Gbar in fully-integrated layered DT implosions. However, pushing this design to higher velocity resulted in a reduction of neutron yield. Highly-resolved capsule simulations suggest that higher Au M-shell preheat due to a reduced Si-dopant fraction resulted in an increase in Atwood number at the ablator-ice interface. These results provide important scaling information for next-generation CH designs.

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Presenters

  • Tilo Doeppner

    Lawrence Livermore Natl Lab

Authors

  • Tilo Doeppner

    Lawrence Livermore Natl Lab

  • Denise E Hinkel

    Lawrence Livermore National Laboratory, Lawrence Livermore Natl Lab

  • Leonard C Jarrott

    Lawrence Livermore Natl Lab

  • Laura Robin Benedetti

    Lawrence Livermore Natl Lab

  • Andrea Kritcher

    Lawrence Livermore National Laboratory, Lawrence Livermore Natl Lab

  • Laurent Pierre Masse

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

  • J. L. L Milovich

    Lawrence Livermore Natl Lab, LLNL

  • Jaebum Park

    Lawrence Livermore Natl Lab

  • Joseph E Ralph

    Lawrence Livermore Natl Lab, Lawrence Livermore National Laboratory

  • Benjamin Bachmann

    Lawrence Livermore Natl Lab, Lawrence Livermore National Lab

  • Daniel T Casey

    Lawrence Livermore Natl Lab, Lawrence Livermore National Laboratory

  • Alastair S Moore

    Lawrence Livermore Natl Lab, Lawrence Livermore National Laboratory

  • Petr L Volegov

    Los Alamos 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