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Title: Shock timing measurements and analysis in deuterium-tritium-ice layered capsule implosions on NIF

Recent advances in shock timing experiments and analysis techniques now enable shock measurements to be performed in cryogenic deuterium-tritium (DT) ice layered capsule implosions on the National Ignition Facility (NIF). Previous measurements of shock timing in inertial confinement fusion implosions [Boehly et al., Phys. Rev. Lett. 106, 195005 (2011); Robey et al., Phys. Rev. Lett. 108, 215004 (2012)] were performed in surrogate targets, where the solid DT ice shell and central DT gas were replaced with a continuous liquid deuterium (D2) fill. These previous experiments pose two surrogacy issues: a material surrogacy due to the difference of species (D2 vs. DT) and densities of the materials used and a geometric surrogacy due to presence of an additional interface (ice/gas) previously absent in the liquid-filled targets. This report presents experimental data and a new analysis method for validating the assumptions underlying this surrogate technique. Comparison of the data with simulation shows good agreement for the timing of the first three shocks, but reveals a considerable discrepancy in the timing of the 4th shock in DT ice layered implosions. Electron preheat is examined as a potential cause of the observed discrepancy in the 4th shock timing.
Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;  [1] ; ;  [2] ;  [3]
  1. Lawrence Livermore National Laboratory, Livermore, California 94551 (United States)
  2. Laboratory for Laser Energetics, Rochester, New York 14623 (United States)
  3. General Atomics, San Diego, California 92196 (United States)
Publication Date:
OSTI Identifier:
22252076
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 21; Journal Issue: 2; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; CAPSULES; DEUTERIUM; ICE; IMPLOSIONS; INERTIAL CONFINEMENT; TRITIUM; US NATIONAL IGNITION FACILITY