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Gyrokinetic simulations of nonlinear interactions between magnetic islands and microturbulence

Plasma Science and Technology 2019年第11期21卷 7-16页

作者： Kaisheng FANG Jian BAO Zhihong LIN Fusion Simulation Center Peking UniversityBeijing 100871People’s Republic of China Beijing National Laboratory for Condensed Matter Physics and CAS Key Laboratory of Soft Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190People’s Republic of China University of Chinese Academy of Sciences Beijing 100049People’s Republic of China Department of Physics and Astronomy University of CaliforniaIrvineCA 92697United States of America

A conservative scheme of kinetic electrons for gyrokinetic simulations in the presence of magnetic islands has been implemented and verified in the gyrokinetic toroidal code, where zonal and nonzonal components of all perturbed quantities are solved together. Using this new conservative scheme, linear simulation of kinetic ballooning mode has been successfully benchmarked with the electromagnetic hybrid model. Simulations of nonlinear interactions between magnetic islands and the ion temperature gradient(ITG) mode in a tokamak show that the islands rotate at the electron diamagnetic drift velocity. The linear ITG structure shifts from the island O-point toward the X-point due to the pressure flattening effect inside the islands, and the nonlinear ITG structure peaks along the magnetic island separatrix because of the increased pressure gradient there.

关键词： gyrokinetic simulations magnetic islands microturbulence

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Linear gyrokinetic simulations of reversed shear Alfvén eigenmodes and ion temperature gradient modes in DIII-D tokamak

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Plasma Science and Technology 2021年第1期23卷 32-38页

作者： Hongyu WANG Pengfei LIU Zhihong LIN Wenlu ZHANG Fusion Simulation Center Peking UniversityBeijing 100871People’s Republic of China Department of Physics and Astronomy University of CaliforniaIrvineCA 92697United States of America Institute of Physics Chinese Academy of SciencesBeijing 100190People’s Republic of China

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

关键词： fast ions gyrokinetic simulation reversed shear Alfvén eigenmodes microturbulence

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