Abstract
We have studied the features of formation and the possible stationary structures of a self-consistent magnetic field in a relativistic collisionless plasma, which are characteristic of a simple geometry of the Weibel instability that is well known in the nonrelativistic case. The universal condition is established, the growth rate is determined, and the criteria of saturation of the Weibel instability are analyzed for a broad class of anisotropic particle distribution functions (for definiteness, in application to an electron-positron plasma). A nonlinear equation of the Grad-Shafranov type describing the potential current structures is derived and its solutions are analytically studied. Special attention is paid to spatially harmonic, nonlinear current configurations with parameters determined by the properties of the initial homogeneous plasma subject to the Weibel instability. It is demonstrated that the magnetic field energy density in the obtained solutions (both harmonic and nonharmonic) can be comparable with the kinetic energy density of plasma particles.
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Original Russian Text © V.Yu. Mart’yanov, V.V. Kocharovsky, Vl.V. Kocharovsky, 2008, published in Zhurnal Éksperimental’noĭ i Teoreticheskoĭ Fiziki, 2008, Vol. 134, No. 6, pp. 1225–1237.
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Mart’yanov, V.Y., Kocharovsky, V.V. & Kocharovsky, V.V. Saturation of relativistic Weibel instability and the formation of stationary current sheets in collisionless plasma. J. Exp. Theor. Phys. 107, 1049–1060 (2008). https://doi.org/10.1134/S1063776108120145
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DOI: https://doi.org/10.1134/S1063776108120145