title: Three-dimensional magnetic structures generated by the development of the filamentation (Weibel) instability in the relativistic regime.
abstract: 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.
authors.affiliation: Physics Department and CNISM, University of Pisa, Pisa, Italy.
authors.forename: F
authors.initials: F
authors.lastname: Califano
authors.forename: D
authors.initials: D
authors.lastname: Del Sarto
authors.forename: F
authors.initials: F
authors.lastname: Pegoraro