Heuristic Representations of Plasma Momentum Transport

TL;DR

This paper critiques traditional tokamak momentum diffusion models, proposing a non-diffusive, velocity-independent momentum-flux term as a more accurate representation of plasma momentum transport.

Contribution

It introduces a novel non-diffusive momentum-flux model that addresses shortcomings of existing heuristic diffusion-based approaches.

Findings

Traditional diffusion models have major shortcomings.

A non-diffusive, velocity-independent flux better represents plasma momentum transport.

The proposed model improves understanding of plasma behavior in tokamaks.

Abstract

It is argued that the form commonly adopted for heuristic representation of tokamak momentum diffusion has major shortcomings, and that a non-diffusive momentum-flux term independent of velocity is more appropriate.