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First observation of edge impurity behavior with n=1 RMP application in EAST L-mode plasma

文献类型：期刊论文

作者Zhang, Wenmin4,5; Zhang, Ling5; Cheng, Yunxin5; Morita, Shigeru1; Sheng, Hui5; Mitnik, Dario6; Sun, Youwen5; Wang, Zhengxiong2; Chu, Yuqi3; Hu, Ailan5
刊名NUCLEAR FUSION
出版日期2024-08-01
卷号64
关键词EAST tokamak impurity ion flux resonant magnetic perturbations screening layer
ISSN号0029-5515
DOI10.1088/1741-4326/ad4ef4
通讯作者Zhang, Ling(zhangling@ipp.ac.cn) ; Jie, Yinxian(yx_jie@ipp.ac.cn)
英文摘要High-Z impurity accumulation suppression and mitigation in core plasma is frequently observed in EAST edge localized mode mitigation experiments by using resonant magnetic perturbations (RMP) coils. To study the individual effects of the RMP field on impurity transport, based on high-performance extreme ultraviolet impurity spectroscopic diagnostics, the effect of the n = 1 (n is the toroidal mode number) RMP field on the behavior of intrinsic impurity ions at the plasma edge, e.g. He+, Li2+, C2+-C5+, O5+, Fe8+, Fe15+, Fe17+, Fe22+, Cu17+, Mo12+, Mo13+ and W27+, is analyzed for the first time in L-mode discharges. Based on the evaluation of the location of these impurity ions, it is found that with the increase in RMP current (I-RMP), an impurity screening layer inside the last closed flux surface is formed, e.g. at rho = 0.74-0.96, which is also the region that the RMP field affects. Outside this screening layer, the impurity ion flux of He+, Li2+, C2+, C3+, O5+, Fe8+, Mo12+ and Mo13+ ions increases gradually, while inside this screening layer, the impurity ion flux of C4+, C5+, Cu17+, W27+, Fe15+, Fe17+ and Fe22+ ions decreases gradually. When I-RMP is higher than a threshold value, RMP field penetration occurs, accompanied with m/n = 2/1 mode locking, and the position of this screening layer moves to the plasma core region, i.e. rho = 0.66-0.76, close to the q = 2 surface, and the opposite behavior of the impurity ion flux at two sides of the screening layer is strengthened dramatically. As a result, significant decontamination effects in the plasma core region, indicated by the factor of ((Gamma(Z+)(Imp))(w/o)-(Gamma(Z+)(Imp)))/(Gamma(Z+)(Imp))(w/o) (where (Gamma(Z+)(Imp))/(Gamma(Z+)(Imp))(w/o) denotes the impurity ion flux ratio with and without RMP), is observed, i.e. 30%-60% for heavy impurity (Fe, Cu, Mo, W), and similar to 27% for light impurity of C. In addition, the analysis of the decontamination effects of C and Fe impurities under four different RMP phase configurations shows that it may be related to the strength of the response of the plasma to RMP. These results enhance the understanding of impurity accumulation suppression by the n = 1 RMP field and demonstrate a candidate approach using RMP coils for W control in magnetic confinement devices.
WOS关键词ERGODIC DIVERTOR ; H-MODE ; DIII-D ; SUPPRESSION ; PHYSICS
资助项目National Natural Science Foundation of Chinahttp://dx.doi.org/10.13039/501100001809[2022YFE03180400] ; National MCF Energy RD Program[12322512] ; National Natural Science Foundation of China[2024PVA0074] ; National Natural Science Foundation of China[2020VMA0001] ; Chinese Academy of Sciences President's International Fellowship Initiative (PIFI)
WOS研究方向Physics
语种英语
WOS记录号WOS:001251823100001
出版者IOP Publishing Ltd
资助机构National Natural Science Foundation of Chinahttp://dx.doi.org/10.13039/501100001809 ; National MCF Energy RD Program ; National Natural Science Foundation of China ; Chinese Academy of Sciences President's International Fellowship Initiative (PIFI)
源URL[http://ir.hfcas.ac.cn:8080/handle/334002/136307]  
专题中国科学院合肥物质科学研究院
通讯作者Zhang, Ling; Jie, Yinxian
作者单位1.Natl Inst Fus Sci, Gifu 5095292, Japan
2.Dalian Univ Technol, Dalian 116024, Peoples R China
3.Univ Calif Los Angeles, Los Angeles, CA 90095 USA
4.Univ Sci & Technol China, Hefei 230026, Peoples R China
5.Chinese Acad Sci, Hefei Inst Phys Sci, Inst Plasma Phys, Hefei 230031, Peoples R China
6.Univ Buenos Aires, Inst Astron & Fis Espacio, CONICET, Buenos Aires, Argentina
推荐引用方式
GB/T 7714		 Zhang, Wenmin,Zhang, Ling,Cheng, Yunxin,et al. First observation of edge impurity behavior with n=1 RMP application in EAST L-mode plasma[J]. NUCLEAR FUSION,2024,64.
APA Zhang, Wenmin.,Zhang, Ling.,Cheng, Yunxin.,Morita, Shigeru.,Sheng, Hui.,...&Liu, Haiqing.(2024).First observation of edge impurity behavior with n=1 RMP application in EAST L-mode plasma.NUCLEAR FUSION,64.
MLA Zhang, Wenmin,et al."First observation of edge impurity behavior with n=1 RMP application in EAST L-mode plasma".NUCLEAR FUSION 64(2024).

入库方式： OAI收割

来源：合肥物质科学研究院

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