Institutional Repository of Chinese Academy of Sciences, Institute of Plasma Physics, Hefei 230031, Anhui, Peoples R China
Resonant effects on the loss of energetic trapped ions induced by low-n resonant magnetic perturbations | |
He, K.1,2; Wan, B. N.1; Sun, Y.1; Jia, M.1,2; Shi, T.1; Wang, H. H.1; Zhang, X. J.1 | |
2019-12-01 | |
发表期刊 | NUCLEAR FUSION |
ISSN | 0029-5515 |
摘要 | The fast ion dynamics and the associated loss channels under resonant magnetic perturbation (RMP) fields are investigated numerically with newly upgraded Monte-Carlo code ORBIT-RF. Special attention is paid to the effect of low-n (n <= 2) perturbations on the confinement of energetic trapped ions in an equilibrium from EAST experiments. Here, n donates the toroidal mode number. It is found that the dominant loss mechanism under n = 2 RMP is essentially different from that under n = 1 RMP. For n = 2 RMP, the enhanced losses are mainly due to the single resonance with omega(p)/omega(b) = 1/2. Here, omega(p) and omega(b) are, respectively, the precession and bounce frequencies. For n = 1 RMP, the losses are mainly due to orbital stochasticity near the trapped-passing boundary, which is mainly promoted by the nonlinear resonances. It is found that the loss fraction has a sine-like dependence on the phase difference between the upper and lower coil currents under both n = 1 and n = 2 RMPs, which suggests the possibility of active control of fast ion profile by designing the spectrum. The loss rate under n = 2 RMP shows a linear dependence on the perturbation amplitude, while the loss rate under n = 1 RMP shows a quadratic dependence. The results here highlight the importance of nonlinear resonances in fast ion confinement under RMP, in addition to that of linear resonances frequently emphasized before. |
关键词 | fast ion orbit following Monte Carlo calculation RMP resonance |
DOI | 10.1088/1741-4326/ab3f80 |
收录类别 | SCI |
语种 | 英语 |
资助项目 | National Key R&D Program of China[2017YFE0301100] ; National Natural Science Foundation of China[11875292] ; National Natural Science Foundation of China[11805237] |
项目资助者 | National Key R&D Program of China ; National Natural Science Foundation of China |
WOS研究方向 | Physics |
WOS类目 | Physics, Fluids & Plasmas |
WOS记录号 | WOS:000494953500011 |
出版者 | IOP PUBLISHING LTD |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://ir.hfcas.ac.cn:8080/handle/334002/73858 |
专题 | 中科院等离子体物理研究所 |
通讯作者 | Sun, Y. |
作者单位 | 1.Chinese Acad Sci, Inst Plasma Phys, POB 26, Hefei 230031, Anhui, Peoples R China 2.Univ Sci & Technol China, Hefei 230026, Anhui, Peoples R China |
第一作者单位 | 中科院等离子体物理研究所 |
通讯作者单位 | 中科院等离子体物理研究所 |
推荐引用方式 GB/T 7714 | He, K.,Wan, B. N.,Sun, Y.,et al. Resonant effects on the loss of energetic trapped ions induced by low-n resonant magnetic perturbations[J]. NUCLEAR FUSION,2019. |
APA | He, K..,Wan, B. N..,Sun, Y..,Jia, M..,Shi, T..,...&Zhang, X. J..(2019).Resonant effects on the loss of energetic trapped ions induced by low-n resonant magnetic perturbations.NUCLEAR FUSION. |
MLA | He, K.,et al."Resonant effects on the loss of energetic trapped ions induced by low-n resonant magnetic perturbations".NUCLEAR FUSION (2019). |
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