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Magnetothermal instability in laser plasmas including hydrodynamic effects.

Bissell, J. J. and Kingham, R. J. and Ridgers, C. P. (2012) 'Magnetothermal instability in laser plasmas including hydrodynamic effects.', Physics of plasmas., 19 (5). 052107.

Abstract

The impact of both density gradients and hydrodynamics on the evolution of the field compressing magnetothermal instability is considered [J. J. Bissell et al., Phys. Rev. Lett. 105, 175001 (2010)]. Hydrodynamic motion is found to have a limited effect on overall growth-rates; however, density gradients are shown to introduce an additional source term corresponding to a generalised description of the field generating thermal instability [D. Tidman and R. Shanny, Phys. Fluids 17, 1207 (1974)]. The field compressing and field generating source terms are contrasted, and the former is found to represent either the primary or sole instability mechanism for a range of conditions, especially those with Hall parameter v > 101. The generalised theory is compared to numerical simulation in the context of a recent nano-second gas-jet experiment [D. H. Froula et al., Phys. Rev. Lett. 98, 135001 (2007)] and shown to be in good agreement: exhibiting peak growth-rates and wavelengths of order 10 ns1 and 50 lm, respectively. The instability’s relevance to other experimental conditions, including those in inertial confinement fusion (I.C.F.) hohlraums, is also discussed.

Item Type:Article
Full text:PDF - Published Version (722Kb)
Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1063/1.4718639
Publisher statement:Copyright 2012 American Institute of Physics. 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 Bissell, J. J. and Kingham, R. J. and Ridgers, C. P. (2012) 'Magnetothermal instability in laser plasmas including hydrodynamic effects.', Physics of plasmas., 19 (5). 052107 and may be found at http://dx.doi.org/10.1063/1.4718639
Record Created:13 Jul 2012 12:50
Last Modified:05 Dec 2014 17:07

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