Interchange transport in electron-positron plasmas with ion impurities

TL;DR

This paper demonstrates that the presence of minority ions significantly reduces interchange-driven transport in electron-positron plasmas, through inertia and collisional effects, using advanced gyrofluid simulations.

Contribution

It introduces a detailed analysis of how ion impurities affect plasma transport in electron-positron systems, highlighting two key mechanisms.

Findings

Transport is strongly reduced by ion impurities.

Inertia and collisional effects are key mechanisms.

Numerical simulations confirm the reduction in plasma transport.

Abstract

Interchange drive and cross-field transport of density filaments in quasi-neutral inhomogeneously magnetized electron-positron plasmas is shown to be strongly reduced by the presence of minority ions. Two mechanisms are identified for the reduction in radial propagation and plasma transport: effective mass related inertia, and collisionality dependent Boltzmann spin-up of the filaments. Numerical results are obtained with a three-dimensional full-F multi-species gyrofluid model.