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Chin. Phys., 2003, Vol. 12(10): 1135-1139    DOI: 10.1088/1009-1963/12/10/014
PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES Prev   Next  

Poloidal rotation of main ions in the CT-6B tokamak

Feng Chun-Hua, Li Zan-Liang, Yang Xuan-Zong, Zheng Shao-Bai, Li Wen-Lai, Wang Long
Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China
Abstract  The poloidal rotation velocity of neutral hydrogen atoms is measured using the Doppler shift of the Hα spectral line emitted in the CT-6B tokamak. The poloidal rotation of hydrogen atoms is generated through the collisions and charge-exchanges with main ions (protons). Therefore, the rotation direction of main ions can be deduced from that of neutral hydrogen atoms. The experimental results show that the main ions rotate in the electron diamagnetic drift direction, the same as the impurity ions, in the plasma core. The neutral hydrogen atoms rotate also in the electron diamagnetic drift direction in the edge region of the plasma. However, the rotation direction of main ions in the edge region cannot be judged from the experimental result due to the long mean free path of hydrogen atoms in the edge region. An inward diffusion flux of hydrogen atoms toward the torus inside with a velocity of the same order of magnitude as their poloidal rotation is also observed.
Keywords:  Doppler shift      main ions      poloidal rotation  
Received:  24 April 2003      Revised:  19 May 2003      Published:  16 March 2005
PACS:  52.20.Hv (Atomic, molecular, ion, and heavy-particle collisions)  
  52.25.Fi (Transport properties)  
  52.55.Fa (Tokamaks, spherical tokamaks)  
  52.25.Os (Emission, absorption, and scattering of electromagnetic radiation ?)  
Fund: Project supported by the National Natural Science Foundation of China (Grant No 10235010).

Cite this article: 

Feng Chun-Hua, Li Zan-Liang, Yang Xuan-Zong, Zheng Shao-Bai, Li Wen-Lai, Wang Long Poloidal rotation of main ions in the CT-6B tokamak 2003 Chin. Phys. 12 1135

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