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Density determination of the thermonuclear fuel region in inertial confinement fusion implosions

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Title: Density determination of the thermonuclear fuel region in inertial confinement fusion implosions
Authors: Volegov, PL
Batha, SH
Geppert-Kleinrath, V
Danly, CR
Merrill, FE
Wilde, CH
Wilson, DC
Casey, DT
Fittinghoff, D
Appelbe, B
Chittenden, JP
Crilly, AJ
McGlinchey, K
Item Type: Journal Article
Abstract: Understanding of the thermonuclear burn in an inertial confinement fusion implosion requires knowledge of the local deuterium–tritium (DT) fuel density. Neutron imaging of the core now provides this previously unavailable information. Two types of neutron images are required. The first is an image of the primary 14-MeV neutrons produced by the D + T fusion reaction. The second is an image of the 14-MeV neutrons that leave the implosion hot spot and are downscattered to lower energy by elastic and inelastic collisions in the fuel. These neutrons are measured by gating the detector to record the 6–12 MeV neutrons. Using the reconstructed primary image as a nonuniform source, a set of linear equations is derived that describes the contribution of each voxel of the DT fuel region to a pixel in the downscattered image. Using the measured intensity of the 14-MeV neutrons and downscattered images, the set of equations is solved for the density distribution in the fuel region. The method is validated against test problems and simulations of high-yield implosions. The calculated DT density distribution from one experiment is presented.
Issue Date: 24-Feb-2020
Date of Acceptance: 1-Jan-2020
URI: http://hdl.handle.net/10044/1/77927
DOI: 10.1063/1.5123751
ISSN: 0021-8979
Publisher: AIP Publishing
Start Page: 1
End Page: 10
Journal / Book Title: Journal of Applied Physics
Volume: 127
Issue: 8
Copyright Statement: © 2020 AIP Publishing LLC.
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Lawrence Livermore National Laboratory
Funder's Grant Number: EP/P010288/1
Keywords: Science & Technology
Physical Sciences
Physics, Applied
Science & Technology
Physical Sciences
Physics, Applied
Applied Physics
01 Mathematical Sciences
02 Physical Sciences
09 Engineering
Publication Status: Published
Article Number: ARTN 083301
Online Publication Date: 2020-02-24
Appears in Collections:Physics
Plasma Physics
Faculty of Natural Sciences