Effect of single-legged coil on 3D plasma boundary corrugation in EAST

Qibin LUAN (栾其斌); Wenda ZHANG (张闻达); Youjie DENG (邓有杰); Yanfei WANG (王燕飞); Li LI (李莉); Yueqiang LIU (刘钺强); Xiaojiang HUANG (黄晓江); Fangchuan ZHONG (钟方川)

doi:10.1088/2058-6272/ac0c06

Plasma Science and Technology > 2021 > 23(10): 105101. > DOI: 10.1088/2058-6272/ac0c06

Qibin LUAN (栾其斌), Wenda ZHANG (张闻达), Youjie DENG (邓有杰), Yanfei WANG (王燕飞), Li LI (李莉), Yueqiang LIU (刘钺强), Xiaojiang HUANG (黄晓江), Fangchuan ZHONG (钟方川). Effect of single-legged coil on 3D plasma boundary corrugation in EAST[J]. Plasma Science and Technology, 2021, 23(10): 105101. DOI: 10.1088/2058-6272/ac0c06

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Effect of single-legged coil on 3D plasma boundary corrugation in EAST

¹ Faculty of Electronic information and Electrical Engineering, Dalian University of Technology, Dalian 116024, People's Republic of China
² School of Physics, Dalian University of Technology, Dalian 116024, People's Republic of China
³ College of Science, Donghua University, Shanghai 201620, People's Republic of China
⁴ General Atomics, San Diego, CA 92186-5608, United States of America

Funds: This work is funded by the Fundamental Research Funds for the Central Universities (No. 2232021G-10), National Natural Science Foundation of China (Nos. 12075053, 11505021 and 11975068) and the National Key R&D Program of China (Nos. 2017YFE030052, 2017YFE0301100, 2017YFE0301104, 2017YFE0300500 and 2017YFE0300501). The work was also supported by the U.S. DoE Office of Science (Nos. DE-FG02–95ER54309 and DEFC02–04ER54698).

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Received Date: April 23, 2021
Revised Date: June 11, 2021
Accepted Date: June 15, 2021

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Abstract

Abstract

A single-legged coil behind the lower divertor and covering a 120° toroidal angle is utilized in a recent EAST discharge, for the purpose of increasing the wetted area of the divertor surface by locally modifying the magnetic field near the X-point. The plasma response, in particular, the plasma boundary surface corrugation due to the single-legged coil current, is modeled by the updated MARS-F code, by computing the plasma displacement for all important toroidal harmonics (n = 1, 2, 4 and 5) associated with the partial toroidal coverage by the coil. The plasma response produced by the single-legged coil is found to be non-local and is of the kink-peeling type. For a reference EAST plasma with a lower single-null magnetic configuration, the plasma boundary corrugation near the X-point, produced by the upper single-legged coil, is about twice as large as that produced by the lower single-legged coil, despite the proximity of the latter to the X-point.
- single-legged coil,
- plasma response,
- EAST

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References

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Effect of single-legged coil on 3D plasma boundary corrugation in EAST