Weibel instability beyond bi-Maxwellian anisotropy

The shape of the anisotropic velocity distribution function, beyond the realm of strict Maxwellians can play a significant role in determining the evolution of the Weibel instability dictating the dynamics of self-generated magnetic fields. For non-Maxwellian distribution functions, we show that the direction of the maximum growth rate wave vector changes with shape. We investigate different laser-plasma interaction model distributions which show that their Weibel generated magnetic fields may require closer scrutiny beyond the second moment (temperature) anisotropy ratio characterization.

Automated summary

The shape of the anisotropic velocity distribution function beyond Maxwellians can significantly influence the evolution of the Weibel instability and the dynamics of self-generated magnetic fields. Different laser-plasma interaction model distributions show that closer scrutiny may be needed for the Weibel generated magnetic fields beyond the second moment anisotropy ratio characterization.