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Self-Generated magnetic fields in the stagnation phase of indirect-drive implosions on the national ignition facility

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Title: Self-Generated magnetic fields in the stagnation phase of indirect-drive implosions on the national ignition facility
Authors: Walsh, C
Chittenden, JP
McGlinchey, K
Niasse, NPL
Appelbe, BD
Item Type: Journal Article
Abstract: Three-dimensional extended-magnetohydrodynamic simulations of the stagnation phase of inertial confinement fusion implosion experiments at the National Ignition Facility are presented, showing self-generated magnetic fields over 10^4 T. Angular high mode-number perturbations develop large magnetic fields, but are localized to the cold, dense hot-spot surface, which is hard to magnetize. When low-mode perturbations are also present, the magnetic fields are injected into the hot core, reaching significant magnetizations, with peak local thermal conductivity reductions greater than 90%. However, Righi-Leduc heat transport effectively cools the hot spot and lowers the neutron spectra-inferred ion temperatures compared to the unmagnetized case. The Nernst effect qualitatively changes the results by demagnetizing the hot-spot core, while increasing magnetizations at the edge and near regions of large heat loss.
Issue Date: 14-Apr-2017
Date of Acceptance: 22-Mar-2017
URI: http://hdl.handle.net/10044/1/45821
DOI: 10.1103/PhysRevLett.118.155001
ISSN: 1079-7114
Publisher: American Physical Society
Journal / Book Title: Physical Review Letters
Volume: 118
Issue: 15
Copyright Statement: © 2017 American Physical Society
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (EPSRC)
Funder's Grant Number: EP/K028464/1
Keywords: Science & Technology
Physical Sciences
Physics, Multidisciplinary
01 Mathematical Sciences
02 Physical Sciences
09 Engineering
General Physics
Publication Status: Published
Open Access location: https://doi.org/10.1103/PhysRevLett.118.155001
Article Number: ARTN 155001
Online Publication Date: 2017-04-10
Appears in Collections:Physics
Plasma Physics
Faculty of Natural Sciences