Influence and measurement of mass ablation in ICF implosions
ORAL
Abstract
Point design ignition capsules designed for the National Ignition Facility use an xray-driven Be(Cu) ablator to compress the DT fuel. Ignition specifications require the mass of unablated Be(Cu), called residual mass, be known to within 1{\%} of the initial ablator mass when the fuel reaches peak velocity. We discuss the impact of variations in residual mass on the relevant capsule failure modes based on one- and two-dimensional radiation hydrodynamics. Experiments designed to measure and to tune the amount of residual mass are being developed as part of the National Ignition Campaign. We also discuss a set of measurement techniques that aim to measure the residual mass along with the peak velocity of the DT fuel. UCRL-ABS-232765
*This work was performed under the auspices of the Department of Energy by the Lawrence Livermore National Laboratory under contract number W-7405-ENG-48.
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