文献类型：期刊文献

英文题名：Simulation of the loss of passing fast ions induced by magnetic islands in EAST tokamak plasmas

作者：Yu, Limin[1];Xue, Erbing[1];Zhang, Debing[1];Zheng, Shuyu[1];Zhang, Xianmei[1];Huang, Juan[2];Li, Erzhong[2];Sheng, Zheng-Mao[3,4];Fu, Jing[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;[3]Zhejiang Univ, Inst Fus Theory & Simulat, Hangzhou 310027, Peoples R China;[4]Zhejiang Univ, Dept Phys, Hangzhou 310027, Peoples R China

年份：2021

卷号：11

期号：2

外文期刊名：AIP ADVANCES

收录：;EI(收录号：20210709921861);WOS:【SCI-EXPANDED(收录号:WOS:000630388900011)】；

基金：L.Y. thanks Professor R. B. White for providing the ORBIT code and also acknowledges useful discussions with Dr. F. Wang. 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 Magnetic Confinement Fusion Science Program of China (Contract No. 2015GB110005), the National Natural Science Foundation of China (Grant Nos. 11675053, 11875131, 11975276, and 12005063), the National Key Research and Development Program of China (Grant Nos. 2019YFE03020004 and 2019YFE03050001), and the Anhui Provincial Natural Science Foundation (Grant No. 2008085J04).

语种：英文

外文关键词：Particle beam injection - Tokamak devices - Magnetoplasma - Phase space methods - Stochastic systems

摘要：The loss of beam ions due to magnetic islands is investigated in a tokamak. The perturbed guiding-center drifts of passing particles including the effect of the finite orbit width are demonstrated. The widths of the drift islands under resonant conditions are studied theoretically and numerically. The ORBIT code is used to simulate the action of the neoclassical tearing mode with a toroidal mode number n = 1 and poloidal mode number m = 2 on passing fast ions generated by neutral beam injection in the Experimental Advanced Superconducting Tokamak. Two loss channels for passing fast ions are identified as the resonant interaction and the stochastic interaction. The lost fast ions in the loss detector zone (LDZ) to simulate the fast-ion loss detector assemble around two regions in phase space, namely, (i) a pitch angle of. = 28. both with and without the mode and (ii). = 59. when the mode amplitude is large enough, where. = arccos(v./v). The number of these lost ions in the LDZ evolves in the period of the mode. The fraction of the total lost ions evolves in the period of the n = 1 oscillation in the toroidal direction. The fraction of lost beam ions has a linear relationship with the mode amplitude in first 10 mu s and a quadratic one thereafter. The corresponding characteristics of the lost beam ions in phase space are also discussed.