Observation and analysis of halo current in EAST

doi:10.1088/1674-1056/23/6/065205

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×I_h/I_P0 is 0.65, furthermore I_h/ I_p0 and TPF×I_h/I_p0 tend to increase with the increase of I_p0. 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
Accepted manuscript online:

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: jpqian@ipp.ac.cn

Cite this article:

Chen Da-Long (陈大龙), Shen Biao (沈飙), Qian Jin-Ping (钱金平), Sun You-Wen (孙有文), Liu Guang-Jun (刘广君), Shi Tong-Hui (石同辉), Zhuang Hui-Dong (庄会东), Xiao Bing-Jia (肖炳甲) Observation and analysis of halo current in EAST 2014 Chin. Phys. B 23 065205

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Observation and analysis of halo current in EAST

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