Non-thermal electron cyclotron emission during runaway plateau in tokamak disruptions from an analytic hot plasma dispersion tensor

TL;DR

This paper derives an analytic dispersion tensor for hot plasmas with Gaussian pitch-angle distributions, providing explicit formulas for non-thermal electron cyclotron emission and instability rates relevant to tokamak disruptions.

Contribution

It introduces a new analytic formalism for hot plasma dispersion, enabling direct calculation of emission and instability parameters in tokamak disruptions.

Findings

Verified solutions with KIAT and SYNO codes.

Identified mechanisms for non-thermal electron cyclotron emission during disruptions.

Showed emission can occur even without kinetic instability onset.

Abstract

We derive an analytic hot plasma dispersion tensor for particle distribution functions characterized by Gaussian pitch-angle distributions. The formalism provides direct analytic expressions for non-thermal electron cyclotron emission coefficients and kinetic instability drive rate. We show the verification of the solutions using the KIAT and SYNO codes. The results offer possible mechanisms that could generate non-thermal electron cyclotron emission during tokamak disruption experiments, even when kinetic instability onset is forbidden.