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Weibel instability analysis in laser-produced plasmas

Published online by Cambridge University Press:  09 March 2009

K. Bendib ,
A. Bendib ,
K. Bendib ,
A. Bendib ,
A. Sid  and
K. Bendib
K. Bendib
Affiliation:
Laboratoire Interaction Laser-Matière, I.R.S.A.M.C., U.P.S., 118 route de Narbonne, 31062 Toulouse Cedex, France
A. Bendib
Affiliation:
Laboratoire Interaction Laser-Matière, I.R.S.A.M.C., U.P.S., 118 route de Narbonne, 31062 Toulouse Cedex, France
K. Bendib
Affiliation:
Laboratoire de Physique des Milieux Ionisés, Institut de Physique, U.S.T.H.B., BP 32 El Alia, Algiers, Algeria
A. Bendib
Affiliation:
Laboratoire de Physique des Milieux Ionisés, Institut de Physique, U.S.T.H.B., BP 32 El Alia, Algiers, Algeria
A. Sid
Affiliation:
Laboratoire de Physique des Milieux Ionisés, Institut de Physique, U.S.T.H.B., BP 32 El Alia, Algiers, Algeria
K. Bendib
Affiliation:
Département des Sciences Fondamentales, E.N.P., BP 182, Algiers, Algeria
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Abstract

Analytic analysis of collisionless Weibel modes in laser-created plasmas is presented. The heat flux (HF), the plasma expansion (PE), and the inverse bremsstrahlung absorption (IBA) sources have been investigated. It has been shown that for short laser wavelengths (λL < 1 µm) and high laser fluxes (I > 1014 W/cm2), the inverse bremsstrahlung absorption is the most efficient Weibel mechanism for producing strong magnetic fields in the vicinity of the critical layer. For large laser wavelengths (λL < 10 µm), the production of the magnetic fields in the vicinity of the critical layer, due to the plasma expansion mechanism, is as important as the ones due to the thermal transport and the inverse bremsstrahlung absorption mechanisms. Useful scaling laws of convective e-foldings, with respect to the laser and the plasma parameters, are also derived.

Type
Research Article
Information
Laser and Particle Beams , Volume 16 , Issue 3 , September 1998 , pp. 473 - 490
Copyright
Copyright © Cambridge University Press 1998

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