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Enhancement of pressure perturbations in ablation due to kinetic magnetized transport effects under direct-drive inertial confinement fusion relevant conditions

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Title: Enhancement of pressure perturbations in ablation due to kinetic magnetized transport effects under direct-drive inertial confinement fusion relevant conditions
Authors: Hill, D
Kingham, RJ
Item Type: Journal Article
Abstract: We present kinetic two-dimensional Vlasov-Fokker-Planck simulations, including both self-consistent magnetic fields and ablating ion outflow, of a planar ablating foil subject to nonuniform laser irradiation. Even for small Hall parameters (ωτei≲0.05) self-generated magnetic fields are sufficient to invert and enhance pressure perturbations. The mode inversion is caused by a combination of the Nernst advection of the magnetic field and the Righi-Leduc heat flux. Nonlocal effects modify these processes. The mechanism is robust under plasma conditions tested; it is amplitude independent and occurs for a broad spectrum of perturbation wavelengths, λp=10–100μm. The ablating plasma response to a dynamically evolving speckle pattern perturbation, analogous to an optically smoothed beam, is also simulated. Similar to the single-mode case, self-generated magnetic fields increase the degree of nonuniformity at the ablation surface by up to an order of magnitude and are found to preferentially enhance lower modes due to the resistive damping of high mode number magnetic fields.
Issue Date: 22-Aug-2018
Date of Acceptance: 30-Jul-2018
URI: http://hdl.handle.net/10044/1/62855
DOI: https://dx.doi.org/10.1103/PhysRevE.98.021201
ISSN: 1539-3755
Publisher: American Physical Society
Journal / Book Title: Physical Review E
Volume: 98
Copyright Statement: ©2018 American Physical Society. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.
Sponsor/Funder: EPSRC
Engineering and Physical Sciences Research Council
Funder's Grant Number: EP/J500239/1
EP/M506345/1
Keywords: Science & Technology
Physical Sciences
Physics, Fluids & Plasmas
Physics, Mathematical
Physics
LASER-PRODUCED PLASMAS
NONLOCAL ELECTRON-TRANSPORT
TARGET
FIELD
INSTABILITY
MODEL
COEFFICIENTS
COMPRESSION
CODE
physics.plasm-ph
Publication Status: Published
Article Number: 021201
Appears in Collections:Physics
Plasma Physics
Faculty of Natural Sciences



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