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Field compressing magnetothermal instability in laser plasmas.

Bissell, J. J. and Ridgers, C. P. and Kingham, R. J. (2010) 'Field compressing magnetothermal instability in laser plasmas.', Physical review letters., 105 (17). p. 175001.


The mechanism for a new instability in magnetized plasmas is presented and a dispersion relation derived. Unstable behavior is shown to result purely from transport processes—feedback between the Nernst effect and the Righi-Leduc heat-flow phenomena in particular—neither hydrodynamic motion nor density gradients are required. Calculations based on a recent nanosecond laser gas-jet experiment [ D. H. Froula et al. Phys. Rev. Lett. 98 135001 (2007)] predict growth of magnetic field and temperature perturbations with typical wavelengths of order 50  μm and characteristic growth times of ∼0.1  ns. The instability yields propagating magnetothermal waves whose direction depends on the magnitude of the Hall parameter.

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Record Created:16 Apr 2012 16:20
Last Modified:20 Dec 2017 11:31

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