Study on divertor plasma behavior through sweeping strike point in new lower divertor on EAST

doi:10.1088/1674-1056/ac4a65

中国物理B ›› 2022, Vol. 31 ›› Issue (6): 65204-065204.doi: 10.1088/1674-1056/ac4a65

Study on divertor plasma behavior through sweeping strike point in new lower divertor on EAST

Yu-Qiang Tao(陶余强)^1,2, Guo-Sheng Xu(徐国盛)^1,†, Ling-Yi Meng(孟令义)^1,2, Rui-Rong Liang(梁瑞荣)^1,2, Lin Yu(余林)^1,2, Xiang Liu(刘祥)¹, Ning Yan(颜宁)¹, Qing-Quan Yang(杨清泉)¹, Xin Lin(林新)¹, and Liang Wang(王亮)^1,3,‡

1 Institute of Plasma Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China;
2 University of Science and Technology of China, Hefei 230026, China;
3 Institute of Energy, Hefei Comprehensive National Science Center, Hefei 230031, China

收稿日期:2021-10-28 修回日期:2022-01-07 接受日期:2022-01-12 出版日期:2022-05-17 发布日期:2022-05-31
通讯作者: Guo-Sheng Xu, Liang Wang E-mail:gsxu@ipp.ac.cn;lwang@ipp.ac.cn
基金资助:
The authors would like to acknowledge collaboration of the EAST team. Project supported by the National Key Research and Development Program of China (Grant No. 2017YFE0301300), the National Natural Science Foundation of China (Grant Nos. 12005257, 12005004, 11905143, and 11922513), the Fund from the Institute of Energy, Hefei Comprehensive National Science Center (Grant No. GXXT-2020-004), the CASHIPS Director's Fund (Grant Nos. BJPY2019A01 and YZJJ2020QN13), the Special Research Assistant Funding of CAS and China Postdoctoral Science Foundation (Grant No. 2020M671913), and Anhui Provincial Natural Science Foundation (Grant No. 2008085QA38).

Study on divertor plasma behavior through sweeping strike point in new lower divertor on EAST

1 Institute of Plasma Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China;
2 University of Science and Technology of China, Hefei 230026, China;
3 Institute of Energy, Hefei Comprehensive National Science Center, Hefei 230031, China

Received:2021-10-28 Revised:2022-01-07 Accepted:2022-01-12 Online:2022-05-17 Published:2022-05-31
Contact: Guo-Sheng Xu, Liang Wang E-mail:gsxu@ipp.ac.cn;lwang@ipp.ac.cn
Supported by:
The authors would like to acknowledge collaboration of the EAST team. Project supported by the National Key Research and Development Program of China (Grant No. 2017YFE0301300), the National Natural Science Foundation of China (Grant Nos. 12005257, 12005004, 11905143, and 11922513), the Fund from the Institute of Energy, Hefei Comprehensive National Science Center (Grant No. GXXT-2020-004), the CASHIPS Director's Fund (Grant Nos. BJPY2019A01 and YZJJ2020QN13), the Special Research Assistant Funding of CAS and China Postdoctoral Science Foundation (Grant No. 2020M671913), and Anhui Provincial Natural Science Foundation (Grant No. 2008085QA38).

摘要/Abstract

摘要： A series of L-mode discharges have been conducted in the new ‘corner slot’ divertor on the Experimental Advanced Superconducting Tokamak (EAST) to study the divertor plasma behavior through sweeping strike point. The plasma control system controls the strike point sweeping from the horizontal target to the vertical target through poloidal field coils, with keeping the main plasma stability. The surface temperature of the divertor target cools down as the strike point moves away, indicating that sweeping strike point mitigates the heat load. To avoid the negative effect of probe tip damage, a method based on sweeping strike point is used to get the normalized profile and study the decay length of particle and heat flux on the divertor target λ_js, λ_q. In the discharges with high radio-frequency (RF) heating power, electron temperature T_e is lower and λ_js is larger when the strike point locates on the horizontal target compared to the vertical target, probably due to the corner effect. In the Ohmic discharges, λ_js, λ_q are much larger compared to the discharges with high RF heating power, which may be attributed to lower edge T_e.

关键词: EAST tokamak, divertor plasma, sweeping strike point, decay length

Abstract: A series of L-mode discharges have been conducted in the new ‘corner slot’ divertor on the Experimental Advanced Superconducting Tokamak (EAST) to study the divertor plasma behavior through sweeping strike point. The plasma control system controls the strike point sweeping from the horizontal target to the vertical target through poloidal field coils, with keeping the main plasma stability. The surface temperature of the divertor target cools down as the strike point moves away, indicating that sweeping strike point mitigates the heat load. To avoid the negative effect of probe tip damage, a method based on sweeping strike point is used to get the normalized profile and study the decay length of particle and heat flux on the divertor target λ_js, λ_q. In the discharges with high radio-frequency (RF) heating power, electron temperature T_e is lower and λ_js is larger when the strike point locates on the horizontal target compared to the vertical target, probably due to the corner effect. In the Ohmic discharges, λ_js, λ_q are much larger compared to the discharges with high RF heating power, which may be attributed to lower edge T_e.

Key words: EAST tokamak, divertor plasma, sweeping strike point, decay length

中图分类号: (Theta pinch)

52.55.Ez

52.55.Rk (Power exhaust; divertors) 52.40.-w (Plasma interactions (nonlaser))

Yu-Qiang Tao(陶余强), Guo-Sheng Xu(徐国盛), Ling-Yi Meng(孟令义), Rui-Rong Liang(梁瑞荣), Lin Yu(余林), Xiang Liu(刘祥), Ning Yan(颜宁), Qing-Quan Yang(杨清泉), Xin Lin(林新), and Liang Wang(王亮). Study on divertor plasma behavior through sweeping strike point in new lower divertor on EAST[J]. 中国物理B, 2022, 31(6): 65204-065204.

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Study on divertor plasma behavior through sweeping strike point in new lower divertor on EAST

Study on divertor plasma behavior through sweeping strike point in new lower divertor on EAST

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