Gyrokinetic δf particle simulations of toroidicity-induced Alfvén eigenmode

Jianying Lang; Yang Chen; Parker, Scott E.; Guo-Yong Fu
October 2009
Physics of Plasmas;Oct2009, Vol. 16 Issue 10, p102101
Academic Journal
Gyrokinetic δf particle simulation is used to investigate toroidicity-induced Alfvén eigenmodes (TAEs). Both thermal ions and energetic particles are fully kinetic, but a reduced fluid model is used for the electrons. Simulation of a single n=2 global TAE is carefully analyzed and benchmarked with an eigenmode analysis, and a very good agreement is achieved in both mode structure and mode frequency. The instability of the mode in the presence of energetic particles is demonstrated. In particular, gyrokinetic simulations demonstrate the kinetic damping effect of thermal ions, where the finite radial structure of kinetic Alfvén waves is well resolved and the damping rate is compared to and found to agree well with analytical theory.


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