Anomalous Diffusion at Edge and Core of a Magnetized Cold Plasma

TL;DR

This paper explains the theory of anomalous diffusion in weakly turbulent cold magnetized plasmas, proposing a new mechanism involving conductive walls and magnetic flux interactions that applies to both edge and core regions.

Contribution

It introduces a novel diffusion mechanism based on wall interactions and magnetic flux cutting, expanding understanding of plasma transport in specific regimes.

Findings

Proposed a new diffusion mechanism involving conductive walls and magnetic flux.

Applicable to regimes with Bohm diffusion scaling and high magnetic field to density ratio.

Provides a unified explanation for edge and core plasma anomalous diffusion.

Abstract

Progress in the theory of anomalous diffusion in weakly turbulent cold magnetized plasmas is explained. Several proposed models advanced in the literature are discussed. Emphasis is put on a new proposed mechanism for anomalous diffusion transport mechanism based on the coupled action of conductive walls (excluding electrodes) bounding the plasma drain current (edge diffusion) together with the magnetic field flux "cutting" the area traced by the charged particles in their orbital motion. The same reasoning is shown to apply to the plasma core anomalous diffusion. The proposed mechanism is expected to be valid in regimes when plasma diffusion scales as Bohm diffusion and at high $B/N$, when collisions are of secondary importance.