Self-Generated magnetic fields in the stagnation phase of indirect-drive implosions on the national ignition facility
File(s)
Published version
Author(s)
Walsh, C
Chittenden, JP
McGlinchey, K
Niasse, NPL
Appelbe, BD
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.
Date Issued
2017-04-14
Date Acceptance
2017-03-22
Citation
Physical Review Letters, 2017, 118 (15)
ISSN
1079-7114
Publisher
American Physical Society
Journal / Book Title
Physical Review Letters
Volume
118
Issue
15
Copyright Statement
© 2017 American Physical Society
Sponsor
Engineering & Physical Science Research Council (EPSRC)
AWE Plc
Engineering & Physical Science Research Council (EPSRC)
Grant Number
EP/K028464/1
300115146/1
EP/M01102X/1
Subjects
Science & Technology
Physical Sciences
Physics, Multidisciplinary
Physics
CONFINEMENT FUSION
TARGETS
01 Mathematical Sciences
02 Physical Sciences
09 Engineering
General Physics
Publication Status
Published
Article Number
ARTN 155001
Date Publish Online
2017-04-10