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Title: Gamma Reaction History ablator areal density constraints upon correlated diagnostic modeling of National Ignition Facility implosion experiments

The inelastic neutron scattering induced γ-ray signal from {sup 12}C in an Inertial Confinement Fusion capsule is demonstrated to be an effective and general diagnostic for shell ablator areal density. Experimental acquisition of the time-integrated signal at 4.4 MeV using threshold detection from four gas Čerenkov cells provides a direct measurement of the {sup 12}C areal density near stagnation. Application of a three-dimensional isobaric static model of data acquired in a recent high neutron yield National Ignition Facility experimental campaign reveals two general trends: smaller remaining ablator mass at stagnation and higher shell density with increasing laser drive.
Authors:
; ; ; ;  [1] ;  [2] ; ; ;  [3]
  1. Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550 (United States)
  2. Colorado School of Mines, Golden, Colorado 80401 (United States)
  3. Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
Publication Date:
OSTI Identifier:
22408222
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 3; Other Information: (c) 2015 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; ABLATION; CAPSULES; CARBON 12; CHERENKOV COUNTERS; COMPUTERIZED SIMULATION; GAMMA RADIATION; IMPLOSIONS; INELASTIC SCATTERING; INERTIAL CONFINEMENT; LASERS; MEV RANGE; NEUTRON DIFFRACTION; PHOTONUCLEAR REACTIONS; THREE-DIMENSIONAL CALCULATIONS; THRESHOLD DETECTORS; US NATIONAL IGNITION FACILITY