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Neutron backscatter edge: A measure of the hydrodynamic properties of the dense DT fuel at stagnation in ICF experiments

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Title: Neutron backscatter edge: A measure of the hydrodynamic properties of the dense DT fuel at stagnation in ICF experiments
Authors: Crilly, AJ
Appelbe, BD
Mannion, OM
Forrest, CJ
Gopalaswamy, V
Walsh, CA
Chittenden, JP
Item Type: Journal Article
Abstract: The kinematic lower bound for the single scattering of neutrons produced in deuterium-tritium (DT) fusion reactions produces a backscatter edge in the measured neutron spectrum. The energy spectrum of backscattered neutrons is dependent on the scattering ion velocity distribution. As the neutrons preferentially scatter in the densest regions of the capsule, the neutron backscatter edge presents a unique measurement of the hydrodynamic conditions in the dense DT fuel. It is shown that the spectral shape of the edge is determined by the scattering rate weighted fluid velocity and temperature of the dense DT fuel layer during neutron production. In order to fit the neutron spectrum, a model for the various backgrounds around the backscatter edge is developed and tested on synthetic data produced from hydrodynamic simulations of OMEGA implosions. It is determined that the analysis could be utilized on current inertial confinement fusion experiments in order to measure the dense fuel properties.
Issue Date: 1-Jan-2020
Date of Acceptance: 1-Dec-2019
URI: http://hdl.handle.net/10044/1/76123
DOI: 10.1063/1.5128830
ISSN: 1070-664X
Publisher: AIP Publishing
Start Page: 012701-1
End Page: 012701-11
Journal / Book Title: Physics of Plasmas
Volume: 27
Issue: 1
Copyright Statement: © 2020 Author(s).
Sponsor/Funder: AWE Plc
Engineering & Physical Science Research Council (EPSRC)
Lawrence Livermore National Laboratory
Funder's Grant Number: 300115146/1
EP/P010288/1
B618573
Keywords: Science & Technology
Physical Sciences
Physics, Fluids & Plasmas
Physics
NUCLEAR-DATA LIBRARY
FUSION
SPECTRA
Science & Technology
Physical Sciences
Physics, Fluids & Plasmas
Physics
NUCLEAR-DATA LIBRARY
FUSION
SPECTRA
0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
0201 Astronomical and Space Sciences
0203 Classical Physics
Fluids & Plasmas
Publication Status: Published
Article Number: ARTN 012701
Online Publication Date: 2020-01-03
Appears in Collections:Physics
Plasma Physics