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Chin. Phys. B, 2014, Vol. 23(6): 065205    DOI: 10.1088/1674-1056/23/6/065205

Observation and analysis of halo current in EAST

Chen Da-Longa, Shen Biaoa, Qian Jin-Pinga, Sun You-Wena, Liu Guang-Juna, Shi Tong-Huia, Zhuang Hui-Donga, Xiao Bing-Jiaa b
a Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China;
b School of Nuclear Science and Technology, University of Science and Technology of China, Hefei 230031, China
Abstract  Plasma in a typically elongated cross-section tokamak (for example, EAST) is inherently unstable against vertical displacement. When plasma loses the vertical position control, it moves downward or upward, leading to disruption, and a large halo current is generated helically in EAST typically in the scrape-off layer. When flowing into the vacuum vessel through in-vessel components, the halo current will give rise to a large J×B force acting on the vessel and the in-vessel components. In EAST VDE experiment, part of the eddy current is measured in halo sensors, due to the large loop voltage. Primary experimental data demonstrate that the halo current first lands on the outer plate and then flows clockwise, and the analysis of the information indicates that the maximum halo current estimated in EAST is about 0.4 times the plasma current and the maximum value of TPF×Ih/IP0 is 0.65, furthermore Ih/ Ip0 and TPF×Ih/Ip0 tend to increase with the increase of Ip0. The test of the strong gas injection system shows good success in increasing the radiated power, which may be effective in reducing the halo current.
Keywords:  EAST      halo current      toroidal peaking factor      mass gas injection  
Received:  15 October 2013      Revised:  11 December 2013      Published:  15 June 2014
PACS:  52.55.Fa (Tokamaks, spherical tokamaks)  
  52.70.Ds (Electric and magnetic measurements)  
Fund: Project supported by the National Magnetic Confinement Fusion Science Program of China (Grant Nos. 2014GB103000 and 2013GB102000) and the National Natural Science Foundation of China (Grant No. 11205199).
Corresponding Authors:  Qian Jin-Ping     E-mail:

Cite this article: 

Chen Da-Long, Shen Biao, Qian Jin-Ping, Sun You-Wen, Liu Guang-Jun, Shi Tong-Hui, Zhuang Hui-Dong, Xiao Bing-Jia Observation and analysis of halo current in EAST 2014 Chin. Phys. B 23 065205

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