Neutron backscatter edge: A measure of the hydrodynamic properties of the dense DT fuel at stagnation in ICF experiments
File(s)POP19-AR-58732_accepted.pdf (594.95 KB)
Accepted version
Author(s)
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.
Date Issued
2020-01-01
Date Acceptance
2019-12-01
Citation
Physics of Plasmas, 2020, 27 (1), pp.012701-1-012701-11
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
AWE Plc
Engineering & Physical Science Research Council (EPSRC)
Lawrence Livermore National Laboratory
Identifier
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000505505200001&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
Grant Number
300115146/1
EP/P010288/1
B618573
Subjects
Science & Technology
Physical Sciences
Physics, Fluids & Plasmas
Physics
NUCLEAR-DATA LIBRARY
FUSION
SPECTRA
Publication Status
Published
Article Number
ARTN 012701
Date Publish Online
2020-01-03