中国物理B ›› 2014, Vol. 23 ›› Issue (6): 65205-065205.doi: 10.1088/1674-1056/23/6/065205

• PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES • 上一篇    下一篇

Observation and analysis of halo current in EAST

陈大龙a, 沈飙a, 钱金平a, 孙有文a, 刘广君a, 石同辉a, 庄会东a, 肖炳甲a b   

  1. 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
  • 收稿日期:2013-10-15 修回日期:2013-12-11 出版日期:2014-06-15 发布日期:2014-06-15
  • 基金资助:
    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).

Observation and analysis of halo current in EAST

Chen Da-Long (陈大龙)a, Shen Biao (沈飙)a, Qian Jin-Ping (钱金平)a, Sun You-Wen (孙有文)a, Liu Guang-Jun (刘广君)a, Shi Tong-Hui (石同辉)a, Zhuang Hui-Dong (庄会东)a, Xiao Bing-Jia (肖炳甲)a b   

  1. 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
  • Received:2013-10-15 Revised:2013-12-11 Online:2014-06-15 Published:2014-06-15
  • Contact: Qian Jin-Ping E-mail:jpqian@ipp.ac.cn
  • Supported by:
    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).

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摘要： 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.

关键词: EAST, halo current, toroidal peaking factor, mass gas injection

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.

Key words: EAST, halo current, toroidal peaking factor, mass gas injection

中图分类号:  (Tokamaks, spherical tokamaks)

  • 52.55.Fa
52.70.Ds (Electric and magnetic measurements)