Soft landing of runaway currents by ohmic field in J-TEXT tokamak

Jie HU (胡捷); Wei YAN (严伟); Ruihai TONG (佟瑞海); Wei LI (李维); Zhongyong CHEN (陈忠勇); Anjue DAI (戴岸珏); Duwei HUANG (黄都伟); Yunong WEI (魏禹农); Tiankui MA (马天逵); Yuan HUANG (黄缘); Yang LI (李阳); Wei ZHENG (郑玮); Zhifang LIN (林志芳); You LI (李由); Huaiyu YANG (杨怀玉); Duoqin WANG (王铎钦); Wei BAI (白炜); Yu ZHONG (钟昱); Jiangang FANG (方建港); J-TEXT Team

doi:10.1088/2058-6272/aba681

Plasma Science and Technology > 2020 > 22(11): 115102. > DOI: 10.1088/2058-6272/aba681

Jie HU (胡捷), Wei YAN (严伟), Ruihai TONG (佟瑞海), Wei LI (李维), Zhongyong CHEN (陈忠勇), Anjue DAI (戴岸珏), Duwei HUANG (黄都伟), Yunong WEI (魏禹农), Tiankui MA (马天逵), Yuan HUANG (黄缘), Yang LI (李阳), Wei ZHENG (郑玮), Zhifang LIN (林志芳), You LI (李由), Huaiyu YANG (杨怀玉), Duoqin WANG (王铎钦), Wei BAI (白炜), Yu ZHONG (钟昱), Jiangang FANG (方建港), J-TEXT Team. Soft landing of runaway currents by ohmic field in J-TEXT tokamak[J]. Plasma Science and Technology, 2020, 22(11): 115102. DOI: 10.1088/2058-6272/aba681

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Soft landing of runaway currents by ohmic field in J-TEXT tokamak

¹ International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics, State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
² Southwestern Institute of Physics, Chengdu 610041, People's Republic of China 3Chengdu University, Chengdu 610106, People’s Republic of China 4Beibu Gulf University, Qinzhou 535000, People's Republic of China
³ Chengdu University, Chengdu 610106, People's Republic of China
⁴ Beibu Gulf University, Qinzhou 535000, People's Republic of China

Funds: This work is supported by the National Key R&D Program of China (No. 2017YFE0302000), the National Magnetic Confinement Fusion Science Program of China (Nos. 2015GB111002, 2015GB104000), National Natural Science Foundation of China (Nos. 11775089, 51821005, 71762031,11575068 and 11905077) and the China Postdoctoral Science Foundation (2019M652615).

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Received Date: May 11, 2020
Revised Date: July 13, 2020
Accepted Date: July 14, 2020

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Abstract

Abstract

Recently, experimental studies on the soft landing of RE current by ohmic (OH) field have been performed in J-TEXT tokamak, as a possible auxiliary method to dissipate the RE current. With optimized horizontal displacement control of the RE beam, the toroidal electric field has been scanned from 1.6 to - 0.3 V m ^-1 during the RE plateau phase. The growth rate of RE currents and the evolution of hard x-ray (HXR) emissions have been studied. It is found that when the toroidal electric field is less than 7–12 times the theoretical critical electric field, the decay of REs could be achieved. The dissipation rate by the ohmic field can reach a maximum value of 3 MA s^-1. Furthermore, the results of HXR spectra analysis indicate the different behaviors of HXR emissions under the condition of different toroidal electric fields. The analysis of the ionized argon emissions and magnetic fluctuations shows that under the condition of different toroidal electric fields, the physical process of RE generation may be different.
- tokamak,
- disruption,
- runaway electron,
- hard x-ray

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References (53)

References

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Soft landing of runaway currents by ohmic field in J-TEXT tokamak