Thermal ion effects on kinetic beta-induced Alfvén eigenmodes excited by energetic ions

Qi, Longyu; Dong, J. Q.; Bierwage, A.; Lu, Gaimin; Sheng, Z. M.
March 2013
Physics of Plasmas;Mar2013, Vol. 20 Issue 3, p032505
Academic Journal
Kinetic beta-induced Alfvén eigenmodes (KBAEs) driven by energetic ions are numerically investigated using revised AWECS code. The thermal ion density and temperature gradients are taken into account. It is found that the growth rate of the KBAEs increases with the thermal ion pressure gradient, and the contributions from the density gradient and temperature gradient of the thermal ions to the enhancement of the instability are comparable. The damping effect of thermal ion dynamics on the modes is also observed.


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