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Effect of edge magnetic island on carbon screening in the J-TEXT tokamak

plasma Science and Technology 2021年第12期23卷 22-31页

作者： Xiaolong ZHANG Zhifeng CHENG Song ZHOU Yunfeng LIANG Wei YAN Nengchao WANG Xiaoyi ZHANG Zhonghe JIANG Zhoujun YANG Xin XU Da LI Qiong LI Xiaodong LIN Yonghua DING Zhongyong CHEN Zhipeng CHEN J-TEXT Team Advanced Energy Research Center Shenzhen UniversityShenzhen 518060People's Republic of China Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Optoelectronic EngineeringShenzhen UniversityShenzhen 518060People's Republic of China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering.Huazhong University of Science and TechnologyWuhan 430074People's Republic of China Forschungszentrum Jiilich GmbH Institut fur Energie und Klimaforschung-Plasmaphysik52425 JiilichGermany

The effect of externally applied resonant magnetic perturbation(RMP)on carbon impurity behavior is investigated in the J-TEXT *** is found that the m/n=3/1 islands have an impurity screening effect,which becomes obvious while the edge magnetic island is generated via RMP field *** impurity screening effect shows a dependence on the RMP phase with the field penetration,which is strongest if the O point of the magnetic island is near the low-field-side(LFS)limiter *** combining a methane injection experimental study and STRAHL impurity transport analysis,we found that the variation of the impurity transport dominates the impurity screening *** impurity diffusion at the inner plasma region(r/a<0.8)is enhanced with a significant increase in outward convection velocity at the edge region in the case of the magnetic island’s O point near the LFS limiter *** impurity transport coefficient varies by a much lower level for the case with the magnetic island’s X point near the LFS limiter *** interaction of the magnetic island and the LFS limiter plate is thought to contribute to the impurity transport variation with the dependence on the RMP phase.A possible reason is the interaction between the magnetic island and the LFS limiter.

关键词： magnetic island impurity transport resonant magnetic perturbation boundary plasma physics J-TEXT tokamak

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