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Perturbation modifications by pre-magnetisation of inertial confinement fusion implosions

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Title: Perturbation modifications by pre-magnetisation of inertial confinement fusion implosions
Authors: Walsh, CA
McGlinchey, K
Tong, JK
Appelbe, BD
Crilly, A
Zhang, MF
Chittenden, JP
Item Type: Journal Article
Abstract: Pre-magnetisation of inertial confinement fusion implosions on the National Ignition Facility has the potential to raise current high-performing targets into the ignition regime [Perkins et al. "The potential of imposed magnetic fields for enhancing ignition probability and fusion energy yield in indirect-drive inertial confinement fusion," Phys. Plasmas 24, 062708 (2017)]. A key concern with this method is that the application of a magnetic field inherently increases asymmetry. This paper uses 3-D extended-magnetohydrodynamics Gorgon simulations to investigate how thermal conduction suppression, the Lorentz force, and α-particle magnetisation affect three hot-spot perturbation scenarios: a cold fuel spike, a time-dependent radiation drive asymmetry, and a multi-mode perturbation. For moderate magnetisations (B0 = 5 T), the single spike penetrates deeper into the hot-spot, as thermal ablative stabilisation is reduced. However, at higher magnetisations (B0 = 50 T), magnetic tension acts to stabilise the spike. While magnetisation of α-particle orbits increases the peak hot-spot temperature, no impact on the perturbation penetration depth is observed. The P4-dominated radiation drive asymmetry demonstrates the anisotropic nature of the thermal ablative stabilisation modifications, with perturbations perpendicular to the magnetic field penetrating deeper and perturbations parallel to the field being preferentially stabilised by increased heat-flows. Moderate magnetisations also increase the prevalence of high modes, while magnetic tension reduces vorticity at the hot-spot edge for larger magnetisations. For a simulated high-foot experiment, the yield doubles through the application of a 50 T magnetic field-an amplification which is expected to be larger for higher-performing configurations.
Issue Date: 1-Feb-2019
Date of Acceptance: 21-Dec-2018
URI: http://hdl.handle.net/10044/1/74352
DOI: https://dx.doi.org/10.1063/1.5085498
ISSN: 1070-664X
Publisher: AIP Publishing
Journal / Book Title: Physics of Plasmas
Volume: 26
Issue: 2
Copyright Statement: © 2019 The Author(s). Published under license by AIP Publishing. 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 https://aip.scitation.org/doi/10.1063/1.5085498
Sponsor/Funder: AWE Plc
Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (EPSRC)
Lawrence Livermore National Laboratory
Funder's Grant Number: 300115146/1
Keywords: Science & Technology
Physical Sciences
Physics, Fluids & Plasmas
0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
0201 Astronomical and Space Sciences
0203 Classical Physics
Fluids & Plasmas
Publication Status: Published
Article Number: ARTN 022701
Online Publication Date: 2019-02-01
Appears in Collections:Physics
Plasma Physics
Faculty of Natural Sciences