Three-dimensional reconstruction of neutron, gamma-ray, and x-ray sources using spherical harmonic decomposition

Neutron, gamma-ray, and x-ray imaging are important diagnostic tools at the National Ignition Facility (NIF) for measuring the two-dimensional (2D) size and shape of the neutron producing region, for probing the remaining ablator and measuring the extent of the DT plasmas during the stagnation phase...

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Bibliographic Details
Published in:Journal of applied physics 2017-11, Vol.122 (17)
Main Authors: Volegov, P. L., Danly, C. R., Fittinghoff, D., Geppert-Kleinrath, V., Grim, G., Merrill, F. E., Wilde, C. H.
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Ablation
abstract harmonic analysis
Applied physics
Decomposition
Diagnostic software
Diagnostic systems
Engineering - Instrumentation related to nuclear science and technology, Nuclear science and engineering, Physics - Plasma physics
Gamma rays
ICF
Image reconstruction
Implosions
Inertial confinement fusion
integral transforms
isotopes
National Ignition Facility
neutron imaging
neutron sources
NIF
Omega
plasma confinement
Plasmas (physics)
radioactive decay
Spherical harmonics
Stagnation
thermal effects
X ray sources
x-rays
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Summary:Neutron, gamma-ray, and x-ray imaging are important diagnostic tools at the National Ignition Facility (NIF) for measuring the two-dimensional (2D) size and shape of the neutron producing region, for probing the remaining ablator and measuring the extent of the DT plasmas during the stagnation phase of Inertial Confinement Fusion implosions. Due to the difficulty and expense of building these imagers, at most only a few two-dimensional projections images will be available to reconstruct the three-dimensional (3D) sources. In this paper, we present a technique that has been developed for the 3D reconstruction of neutron, gamma-ray, and x-ray sources from a minimal number of 2D projections using spherical harmonics decomposition. We present the detailed algorithms used for this characterization and the results of reconstructed sources from experimental neutron and x-ray data collected at OMEGA and NIF.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4986652