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Linear gyrokinetic simulations of reversed shear Alfvn eigenmodes and ion temperature gradient modes in DIII-D tokamak
Plasma Science and Technology ( IF 1.7 ) Pub Date : 2020-12-04 , DOI: 10.1088/2058-6272/abc871
Hongyu WANG 1, 2 , Pengfei LIU 2 , Zhihong LIN 2 , Wenlu ZHANG 3
Affiliation  

Global linear gyrokinetic simulations using realistic DIII-D tokamak geometry and plasma profiles find co-existence of unstable reversed shear Alfvn eigenmodes (RSAE) with low toroidal mode number n and electromagnetic ion temperature gradient (ITG) instabilities with higher toroidal mode number n. For intermediate n=[10, 12], RSAE and ITG co-exist and overlap weakly in the radial domain with similar growth rates but different real frequencies. Both RSAE and ITG growth rates decrease less than 5% when compressible magnetic perturbations are neglected in the simulations. The ITG growth rates increase less than 7% when fast ions are not included in the simulations. Finally, the effects of trapped electrons on the RSAE are negligible.

更新日期:2020-12-04
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