Analysis of M=1 Modes in The EAST Tokamak

TL;DR

This paper analyzes various M=1 modes in the EAST Tokamak by solving the fishbone dispersion relation, explaining mode excitation mechanisms and calculating key mode parameters.

Contribution

It provides a detailed analysis of fishbone and internal kink modes in EAST Tokamak, including mode excitation and parameter calculation, advancing understanding of plasma stability.

Findings

Precession fishbone excitation explained by Neutral Beam Injection.

Real frequency and growth rate of modes calculated.

Relevance of diamagnetic branch discussed for equilibrium profiles.

Abstract

An analysis of precession fishbone, diamagnetic fishbone and internal kink mode in Tokamak plasmas is presented via solving the fishbone dispersion relation. Applying the dispersion relation to a typical EAST discharge, excitation of precession fishbone due to Neutral Beam Injection is successfully explained. The real frequency and growth rate of diamagnetic fishbone and internal kink mode are calculated, and the relevance of the diamagnetic branch is also discussed for the possible equilibrium profile.