Radiation of electrons in Weibel-generated fields: a general case

TL;DR

This paper extends jitter radiation theory to account for anisotropic electron distributions in Weibel-generated magnetic fields, enhancing its applicability to laboratory and astrophysical plasma experiments.

Contribution

It introduces a generalized jitter radiation model that relaxes the isotropy assumption of electron distributions, enabling better comparison with experimental data.

Findings

Extended jitter theory to anisotropic distributions

Applicable to laboratory and astrophysical plasmas

Improves interpretation of radiation in Weibel fields

Abstract

Weibel instability turns out to be the a ubiquitous phenomenon in High-Energy Density environments, ranging from astrophysical sources, e.g., gamma-ray bursts, to laboratory experiments involving laser-produced plasmas. Relativistic particles (electrons) radiate in the Weibel-produced magnetic fields in the Jitter regime. Conventionally, in this regime, the particle deflections are considered to be smaller than the relativistic beaming angle of 1/$\gamma$ ($\gamma$ being the Lorentz factor of an emitting particle) and the particle distribution is assumed to be isotropic. This is a relatively idealized situation as far as lab experiments are concerned. We relax the assumption of the isotropy of radiating particle distribution and present the extension of the jitter theory amenable for comparisons with experimental data.