Linear collisionless dynamics of the GAM with kinetic electrons: Comparison simulations/theory

• DOI: 10.1063/1.5113679
• Publication Date: 2019-12-12T13:22:57Z
• Authors: V. Grandgirard; X. Garbet; Ch. Ehrlacher; A. Biancalani; A. Bottino; I. Novikau; Y. Asahi; E. Caschera; G. Dif-Pradalier; P. Donnel; Ph. Ghendrih; C. Gillot; G. Latu; Ch. Passeron; Y. Sarazin; D. Zarzoso
• Keywords: Mass ratio; Electron temperature

Barely trapped and passing electrons have been recently predicted to strongly enhance the damping rate of Geodesic Acoustic Modes (GAMs) in tokamak plasmas, while keeping their real frequency almost unchanged as compared case with adiabatic electrons. In this paper, dedicated gyrokinetic simulations are successfully these analytical predictions. Specifically, scaling GAM respect ion electron mass ratio, temperature safety factor, aspect ratio is recovered most regions relevant parameter space.