Reducing the effects of X-ray pre-heat in double shell NIF capsules by over-coating the high Z shell

POSTER

Abstract

Hohlraum generated X-rays will penetrate the ablator of a double shell capsule and be absorbed in the outer surface of the inner capsule. The ablative pressure this generates drives a shock into the central fuel, and a reflected shock that reaches the inner high-Z shell surface before the main shock even enters the fuel. With a beryllium over-coat preheat X-rays deposit just inside the beryllium/high z interface. The beryllium tamps the preheat expansion, eliminating ablation, and dramatically reducing pressure. The slow shock or pressure wave it generates is then overtaken by the main shock, avoiding an early shock in the fuel and increasing capsule yield.

Authors

  • Doug Wilson

    LANL, Los Alamos Natl Lab, Los Alamos National Laboratory

  • J. L. Milovich

    LLNL, Lawrence Livermore Natl Lab

  • William Daughton

    Los Alamos National Laboratory, LANL, Los Alamos Natl Lab

  • E.N. Loomis

    LANL, Los Alamos Natl Lab, Los Alamos National Laboratory

  • Joshua Sauppe

    LANL, Los Alamos Natl Lab

  • Evan Dodd

    LANL, Los Alamos Natl Lab, Los Alamos National Laboratory

  • E.C. Merritt

    LANL, Los Alamos National Lab, Los Alamos National Laboratory

  • D.S. Montgomery

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

  • Dru Renner

    LANL, Los Alamos Natl Lab

  • Brian Haines

    Los Alamos National Laboratory, LANL

  • Tana Cardenas

    Los Alamos National Laboratory, LANL, Los Alamos Natl Lab

  • T. Desjardins

    Los Alamos National Laboratory, Los Alamos National Laborotory, LANL

  • Sasi Palaniyappan

    LANL, Los Alamos Natl Lab

  • Steve Batha

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