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Magnetic field transport in propagating thermonuclear burn

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Title: Magnetic field transport in propagating thermonuclear burn
Authors: Appelbe, B
Velikovich, AL
Sherlock, M
Walsh, C
Crilly, A
O' Neill, S
Chittenden, J
Item Type: Journal Article
Abstract: High energy gain in inertial fusion schemes requires the propagation of a thermonuclear burn wave from hot to cold fuel. We consider the problem of burn propagation when a magnetic field is orthogonal to the burn wave. Using an extended-MHD model with a magnetized α energy transport equation, we find that the magnetic field can reduce the rate of burn propagation by suppressing electron thermal conduction and α particle flux. Magnetic field transport during burn propagation is subject to competing effects: the field can be advected from cold to hot regions by ablation of cold fuel, while the Nernst and α particle flux effects transport the field from hot to cold fuel. These effects, combined with the temperature increase due to burn, can cause the electron Hall parameter to grow rapidly at the burn front. This results in the formation of a self-insulating layer between hot and cold fuel, which reduces electron thermal conductivity and α transport, increases the temperature gradient, and reduces the rate of burn propagation.
Issue Date: 1-Mar-2021
Date of Acceptance: 9-Feb-2021
URI: http://hdl.handle.net/10044/1/94102
DOI: 10.1063/5.0040161
ISSN: 1070-664X
Publisher: American Institute of Physics
Start Page: 1
End Page: 9
Journal / Book Title: Physics of Plasmas
Volume: 28
Issue: 3
Copyright Statement: © 2021 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http:// creativecommons.org/licenses/by/4.0/).
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Lawrence Livermore National Laboratory
Lawrence Livermore National Laboratory
Funder's Grant Number: EP/P010288/1
Keywords: Science & Technology
Physical Sciences
Physics, Fluids & Plasmas
Science & Technology
Physical Sciences
Physics, Fluids & Plasmas
Fluids & Plasmas
0201 Astronomical and Space Sciences
0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
0203 Classical Physics
Publication Status: Published
Article Number: ARTN 032705
Online Publication Date: 2021-03-05
Appears in Collections:Physics
Plasma Physics
Faculty of Natural Sciences

This item is licensed under a Creative Commons License Creative Commons