Signatures of asymmetry in neutron spectra and images predicted by three-dimensional radiation hydrodynamics simulations of indirect drive implosions
File(s)
Accepted version
Author(s)
Chittenden, JP
Appelbe, BD
Manke, F
McGlinchey, K
Niasse, NPL
Type
Journal Article
Abstract
We present the results of 3D simulations of indirect drive inertial confinement fusion capsules driven by the “high-foot” radiation pulse on the National Ignition Facility. The results are post-processed using a semi-deterministic ray tracing model to generate synthetic deuterium-tritium (DT) and deuterium-deuterium (DD) neutronspectra as well as primary and down scatteredneutronimages. Results with low-mode asymmetries are used to estimate the magnitude of anisotropy in the neutronspectra shift, width, and shape. Comparisons of primary and down scatteredimages highlight the lack of alignment between the neutron sources,scatter sites, and detector plane, which limits the ability to infer the ρr of the fuel from a down scattered ratio. Further calculations use high bandwidth multi-mode perturbations to induce multiple short scale length flows in the hotspot. The results indicate that the effect of fluid velocity is to produce a DT neutronspectrum with an apparently higher temperature than that inferred from the DD spectrum and which is also higher than the temperature implied by the DT to DD yield ratio.
Date Issued
2016-05-16
Date Acceptance
2016-05-02
Citation
Physics of Plasmas, 2016, 23 (5)
ISSN
1089-7674
Publisher
American Institute of Physics (AIP)
Journal / Book Title
Physics of Plasmas
Volume
23
Issue
5
Copyright Statement
© 2016 AIP Publishing LLC. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Physics of Plasmas and may be found at http://dx.doi.org/10.1063/1.4949523
Sponsor
AWE Plc
Engineering & Physical Science Research Council (EPSRC)
Grant Number
300115146/1
EP/K028464/1
Subjects
Fluids & Plasmas
0202 Atomic, Molecular, Nuclear, Particle And Plasma Physics
0201 Astronomical And Space Sciences
0203 Classical Physics
Publication Status
Published
Article Number
052708