Three-dimensional magnetic structures generated by the development of the filamentation (Weibel) instability in the relativistic regime.
We present three-dimensional, fully relativistic, fluid simulations of the dynamics of inhomogeneous counter streaming beams with the aim of understanding the magnetic structures that can be expected to form as a consequence of the development of the so-called Weibel instability. Ringlike structures in the transverse direction are generated as a consequence of the development of a spatially resonant mode. We describe the structures generated by beams of equal initial density and velocity and by a fast, less dense beam compensated by a slower, denser beam. We consider these two cases as schematic models of a laser produced beam propagating in a plasma with nearly equal density and in a plasma much denser than the injected beam.
Califano
F
F
Physics Department and CNISM, University of Pisa, Pisa, Italy.
Del Sarto
D
D
Pegoraro
F
F