题   目：Gyrokinetic simulation of Alfvén eigenmodes excited by energetic particles

报告人：包 健（101室）       

时   间：2021年6月3日（周四） 下午 13:30

地   点：聚变所二楼大会议室

摘   要：In order to predict the AE activities for fusion experiments, we developed an eigenvalue code, i.e., General Alfven Mode solver (GAM-solver), which computes the linear dispersion relation of the AE-EP system in experimental geometry. Compared to the widely used ideal MHD model, the kinetic effects of thermal plasmas and EPs such as FLR, parallel electric field and wave-particle resonance effects, have been incorporated in the eigenmode equation of GAM-solver in a non-perturbative manner, which can modify the mode structure and the damping rate, and lead to the formation of new class kinetic modes. Beyond comparing with theory, GAM-solver has been benchmarked with NOVA-K, GTC and M3D-C1 codes on TAE, RSAE and internal kink mode for realistic DIII-D shots, and it is noteworthy to mention that the computational resources required by GAM-solver are much smaller than most gyrokinetic codes for the linear stability analysis. Also, GAM-solver has been applied to explain the high frequency AEs observed in EAST H-mode discharges recently, which concludes that the kinetic effects of background plasmas are crucial to the global eigenmode formation when the central gap frequency varies with the radial position drastically. Furthermore, the low frequency mode (LFM) of reactive type identified in DIII-D experiments is also studied by using GAM-solver code, and the distinction between BAAE and LFM will be discussed.