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Magnetised thermal self-focusing and filamentation of long-pulse lasers in plasmas relevant to magnetised ICF experiments

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Title: Magnetised thermal self-focusing and filamentation of long-pulse lasers in plasmas relevant to magnetised ICF experiments
Authors: Watkins, HC
Kingham, RJ
Item Type: Journal Article
Abstract: In this paper we study the influence of the magnetised thermal conductivity on the propagation of a nanosecond $10^{14} \mathrm{Wcm}^{-2}$ laser in an underdense plasma by performing simulations of a paraxial model laser in a plasma with the full Braginskii magnetised transport coefficients. Analytic theory and simulations show the shortening of the self-focal length of a laser beam in a plasma as a result of the reduction of the plasma thermal conductivity in a magnetic field. Furthermore the filamentation of a laser via the thermal mechanism is found to have an increased spatial growth rate in a magnetised plasma. We discuss the effect of these results on recent magnetised inertial fusion experiments where filamentation can be detrimental to laser propagation and uniform laser heating. We conclude the application of external magnetic fields to laser-plasma experiments requires the inclusion of the extended electron transport terms in simulations of laser propagation.
Issue Date: 4-Sep-2018
Date of Acceptance: 19-Aug-2018
URI: http://hdl.handle.net/10044/1/63609
DOI: https://dx.doi.org/10.1063/1.5049229
ISSN: 1070-664X
Publisher: AIP Publishing
Journal / Book Title: Physics of Plasmas
Volume: 25
Issue: 9
Copyright Statement: © 2018 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 and Physical Sciences Research Council
Funder's Grant Number: EP/M507878/1
Keywords: physics.plasm-ph
0202 Atomic, Molecular, Nuclear, Particle And Plasma Physics
0201 Astronomical And Space Sciences
0203 Classical Physics
Fluids & Plasmas
Notes: 10 pages, 9 figures
Publication Status: Published
Article Number: 092701
Appears in Collections:Physics
Plasma Physics
Faculty of Natural Sciences