Magnetic field effects on electron heat transport in laser-produced plasmas

M. Strauss, G. Hazak, D. Shvarts, R. S. Craxton

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

The classical treatment of thermal heat transport in the presence of magnetic fields has been modified to include effects associated with steep temperature gradients by extending the one-dimensional model of Shvarts et al. [Phys. Rev. Lett. 47, 247 (1981)] to three dimensions. The effects of magnetic field inhibition are described in terms of the parameter 0=c ei, where c is the electron gyrofrequency and ei the (thermal) electron-ion collision time. The model has been applied to plasmas whose zeroth-order distribution functions (f0) are Maxwellian, and solutions have been obtained for the components of the heat flux across the magnetic field, parallel and perpendicular to the temperature gradient. It is found that it is only for small 0 (0.2) that the anisotropic portion of the distribution function (f 1) is limited, according to the prescription of Shvarts et al., to f0 where is an ad hoc cutoff parameter of value approximately unity; for higher values of 0, a strong reduction of both components of the heat flux occurs due to the inhibition of the more energetic heat-carrying electrons in the distribution, and the classical Braginskii results are valid (in the sense that f1 f0 for heat-carrying electrons). The sensitivity of the results to the parameter is examined. For parameters typical of glass-laser-generated plasmas, strong inhibition may occur for magnetic fields as small as 100 kG.

Original languageEnglish
Pages (from-to)2627-2637
Number of pages11
JournalPhysical Review A
Volume30
Issue number5
DOIs
StatePublished - 1 Jan 1984
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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