Excitation of low-n TAE instabilities by energetic particles in global gyrokinetic tokamak plasmas

TL;DR

This paper presents the first linear global electromagnetic gyrokinetic simulation demonstrating how energetic particles excite TAE instabilities in tokamak plasmas, showing frequency shifts with increased particle pressure.

Contribution

It introduces a novel simulation approach for studying TAE excitation by energetic particles in a global gyrokinetic framework.

Findings

TAE frequency decreases with higher energetic particle pressure

First linear global electromagnetic gyrokinetic simulation of TAE excitation

Demonstrates the impact of energetic particles on TAE stability

Abstract

The first linear global electromagnetic gyrokinetic particle simulation on the excitation of toroidicity induced Alfven eigenmode (TAE) by energetic particles is reported. With an increase in the energetic particle pressure, the TAE frequency moves down into the lower continuum.