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Chin. Phys. B, 2010, Vol. 19(6): 065201    DOI: 10.1088/1674-1056/19/6/065201
PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES Prev   Next  

AC operation and runaway electron behaviour in HT-7 tokamak

Lu Hong-Wei, Hu Li-Qun, Zhou Rui-Jie, Lin Shi-Yao, Zhong Guo-Qiang, Wang Shao-Feng, Chen Kai-Yun, Xu Ping, ZhangJi-Zong, Ling Bi-Li, Mao Song-Tao, DuanYan-Min
Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230030, China
Abstract  Operation of HT-7 tokamak in a multicycle alternating square wave plasma current regime is reported. A set of AC operation experiments, including LHW heating to enhance plasma ionization during the current transition and current sustainment, is described. The behaviour of runaway electrons is analysed by four HXR detectors tangentially viewing the plasma in the equatorial plane, within energy ranges 0.3--1.2~MeV and 0.3--7~MeV, separately. High energy runaway electrons (\sim MeV) are found to circulate predominantly in the opposite direction to the plasma current, while the number of low energy runaway electrons (\sim tens to hundreds of keV) circulating along the plasma current is comparable to that in the direction opposite to the plasma current. AC operation with lower hybrid current drive (LHCD) is observed to have an additional benefit of suppressing the runaway electrons if the drop of the loop voltage is large enough.
Keywords:  alternating current (AC) discharge      lower hybrid current drive      loop voltage      runaway electron     
Received:  04 September 2009      Published:  15 June 2010
PACS:  52.55.Fa (Tokamaks, spherical tokamaks)  
  28.52.Cx (Fueling, heating and ignition)  
  52.50.Jm (Plasma production and heating by laser beams (laser-foil, laser-cluster, etc.))  
  52.25.Jm (Ionization of plasmas)  
  52.35.Hr (Electromagnetic waves (e.g., electron-cyclotron, Whistler, Bernstein, upper hybrid, lower hybrid))  
  52.55.Wq (Current drive; helicity injection)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos.~10935004 and 10775041).

Cite this article: 

Lu Hong-Wei, Hu Li-Qun, Zhou Rui-Jie, Lin Shi-Yao, Zhong Guo-Qiang, Wang Shao-Feng, Chen Kai-Yun, Xu Ping, ZhangJi-Zong, Ling Bi-Li, Mao Song-Tao, DuanYan-Min AC operation and runaway electron behaviour in HT-7 tokamak 2010 Chin. Phys. B 19 065201

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