Toroidal modeling of penetration of the resonant magnetic perturbation field

TL;DR

This paper introduces a toroidal, quasi-linear model to analyze how resonant magnetic perturbation fields penetrate plasma, highlighting the significant role of neoclassical toroidal viscous torque in plasma rotation braking.

Contribution

It develops a novel coupled model combining plasma response with toroidal momentum balance to better understand RMP penetration dynamics.

Findings

Neoclassical toroidal viscous torque significantly influences RMP penetration.

Model quantifies effects of physical parameters on plasma response.

Results show the importance of viscous torque in plasma rotation braking.

Abstract

A toroidal, quasi-linear model is proposed to study the penetration dynamics of the resonant magnetic perturbation (RMP) field into the plasma. The model couples the linear, fluid plasma response to a toroidal momentum balance equation, which includes torques induced by both fluid electromagnetic force and by (kinetic) neoclassical toroidal viscous force. The numerical results for a test toroidal equilibrium quantify the effects of various physical parameters on the field penetration and on the plasma rotation braking. The neoclassical toroidal viscous torque plays a dominant role in certain region of the plasma, for the RMP penetration problem considered in this work.