文献类型：期刊文献

英文题名：The effect of applied n = 1 resonant magnetic perturbations on energetic particle losses in a tokamak

作者：Zheng, Rui[1];Yu, Limin[1];Zhang, Xianmei[1];Zhang, Debing[1];Sun, Youwen[2];Huang, Juan[2]

机构：[1]East China Univ Sci & Technol, Dept Phys, Shanghai 200237, Peoples R China;[2]Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Peoples R China

年份：2025

卷号：32

期号：5

外文期刊名：PHYSICS OF PLASMAS

收录：;WOS:【SCI-EXPANDED(收录号:WOS:001482976400004)】；

基金：The authors thank Professor R. B. White for providing the ORBIT code and also acknowledge useful discussions with Dr. B. Zhang and Dr. K. He. The numerical computations were performed on the ShenMa High Performance Computing Cluster at the Institute of Plasma Physics of the Chinese Academy of Sciences. This work was supported by the National Natural Science Foundation of China (Grant No. 12375215) and the National Key Research and Development Program of China (Grant Nos. 2019YFE03050001 and 2019YFE03020004).

语种：英文

摘要：This paper presents a numerical simulation of the loss of energetic particles (EPs) induced by resonant magnetic perturbations (RMPs) in the EAST tokamak, specifically for the case where q 95 < 3.5 . The loss of EPs generated by neutral beam injection due to the n = 1 RMPs is simulated. The results indicate that the n = 1 RMPs can cause significant losses of EPs. These lost EPs are distributed in both the toroidal and poloidal directions below the midplane, potentially resulting in additional thermal load to the first wall of the device. The main lost particles are passing ions. Three mechanisms resulting in the EP losses are identified, namely, the RMP-induced prompt loss, the resonant loss, and the orbit-transition loss. The kinetic Poincar & eacute; plots show the nonlinear resonant interactions with the ratio of poloidal bounce frequency to toroidal transit frequency of EP being 5 / 2 and 7 / 3 . The passing particles in the certain region of the phase space can be pushed by the RMPs to the lost trapped region. Varying the phase of RMP also influences EP transport, and there may be an optimal RMP phase that minimizes EP loss. Finally, the analysis of various parameters indicates that varying the RMP amplitude significantly affects the loss of EPs through the resonant interactions. Once the RMP amplitude exceeds a critical threshold, the EP losses increase rapidly. Furthermore, the effects of different poloidal components of the magnetic perturbation on the loss of EPs exhibit similar trends. An increase in the number of the poloidal components of the magnetic perturbation enhances the EP losses and lowers the magnitude of the loss threshold.