Geodesic mode instability driven by electron and ion fluxes during neutral beam injection in tokamaks

F Camilo De Souza,A.G Elfimov,R.M.O Galvão,J Krbec,J Seidl,J Stöckel,M Hron,J Havlicek,K Mitosinkova

doi:10.1016/j.physleta.2017.07.033

Geodesic mode instability driven by electron and ion fluxes during neutral beam injection in tokamaks

F Camilo De Souza, A.G Elfimov + Show 7 more

https://doi.org/10.1016/j.physleta.2017.07.033

Copy DOI

Journal: Physics Letters A	Publication Date: Jul 27, 2017
Citations: 4

Affiliation: Universidade de São Paulo, Czech Academy of Sciences, Institute of Plasma Physics, Czech Technical University in Prague

#Geodesic Acoustic Modes #Energetic Geodesic Acoustic Modes + Show 8 more

Abstract
Full-Text PDF
Similar Papers

Abstract

The effect of a minor concentration of energetic particles produced by parallel NB injection on Geodesic Acoustic Modes (GAM) spectrum is analyzed using fully kinetic equation. It is found that the GAM frequency is reduced by the effective mass renormalization due to that new energetic GAM appears with higher frequency. The electron current in combination with NB driven ion flow, modeled by shifted Maxwell distribution, may overcome the ion Landau damping thus resulting in the GAM instability when electron current velocity is larger than the effective parallel GAM phase velocity Rqω. Qualitative agreement of the theory with co/counter NB injection experiments in COMPASS tokamak is demonstrated.

Full Text