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Effects of Circulating Energetic Ions on Geodesic Acoustic Modes with Toroidal Rotation

Effects of circulating energetic ions (CEIs) on the geodesic acoustic modes (GAMs) in toroidally rotating tokamaks are theoretically analyzed utilizing the hybrid kinetic-fluid model. The frequencies of GAMs in the presence of toroidal rotation and CEIs are derived by first considering the rigid equilibrium condition. The unperturbed distribution function of CEIs depends on the poloidal angle, eventually influencing the frequencies significantly. The co-CEIs and counter-CEIs do not cancel each other in the balanced tangential neutral beam injection (NBI) case and show destabilizing effect on the zonal flows. The accurate mode frequency and the growth rate are presented.

preprint2014arXivOpen access
Haijun RenChao DongPaul K. Chu
physics.plasm-ph
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Haijun RenChao DongPaul K. Chu

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