Numerical study of the magnetic electron drift vortex mode turbulence in a nonuniform magnetoplasma

TL;DR

This study uses simulations to explore how magnetic field inhomogeneities affect the turbulence of magnetic electron drift vortex modes in nonuniform magnetoplasmas, revealing suppression of certain structures and changes in spectral behavior.

Contribution

It is the first to analyze the impact of magnetic field inhomogeneity on MEDV mode turbulence, showing suppression of streamer-like structures and spectral modifications.

Findings

Magnetic field inhomogeneity suppresses streamer-like structures.

The turbulence exhibits a non-Kolmogorov spectrum that changes with magnetic inhomogeneity.

The spectrum becomes flatter with a 7/3 power law in inhomogeneous magnetic fields.

Abstract

A simulation study of the magnetic electron drift vortex (MEDV) mode turbulence in a magnetoplasma in the presence of inhomogeneities in the plasma temperature and density, as well as in the external magnetic field, is presented. The study shows that the influence of the magnetic field inhomogeneity is to suppress streamer-like structures observed in previous simulation studies without background magnetic fields. The MEDV mode turbulence exhibits non-universal (non-Kolmogorov type) spectra for different sets of the plasma parameters. In the presence of an inhomogeneous magnetic field, the spectrum changes to a 7/3 power law, which is flatter than without magnetic field gradients. The relevance of this work to laser-produced plasmas in the laboratory is briefly mentioned.