Saturation mechanism of the Weibel instability in weakly magnetized plasmas

Details Saturation mechanism of the Weibel instability in weakly magnetized plasmas Saturation mechanism of the Weibel instability in weakly magnetized plasmas

2005-01-20

arxiv.org/abs/physics/0501110v2

Phys.Plasmas 12 (2005) 080705

Physics

Plasma Physics

13 pages, 3 figures, REVTeX. Accepted for publication in Phys. Plasmas

Scientific paper

10.1063/1.2017942

The saturation mechanism of the Weibel instability is investigated theoretically by considering the evolution of currents in numerous cylindrical beams that are generated in the initial stage of the instability. Based on a physical model of the beams, it is shown that the magnetic field strength attains a maximum value when the currents in the beams evolve into the Alfven current and that there exist two saturation regimes. The theoretical prediction of the magnetic field strength at saturation is in good agreement with the results of two-dimensional particle-in-cell simulations for a wide range of initial anisotropy.

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