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

Journal Article · Sun Mar 15 00:00:00 EDT 2015 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4916124· OSTI ID:22408222

Sayre, D. B.; Landen, O. L.; Church, J. A.; Stoeffl, W. ^[1]; Grafil, E. M. ^[2]; Herrmann, H. W.; Hoffman, N. M.; Kim, Y. ^[3]

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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)

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.

• OSTI ID: 22408222
• Journal Information: Physics of Plasmas, Vol. 22, Issue 3; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

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