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Chinese Physics, 2005, Vol. 14(1): 159-162    DOI: 10.1088/1009-1963/14/1/029
PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES Prev   Next  

Boundary turbulence and transport in density scanning experiment on TH-7 tokamak

Xu Guo-Sheng (徐国盛), Wan Bao-Nian (万宝年), Song-Mei (宋梅)
Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China
Abstract  The boundary turbulence and transport in density scanning experiment were investigated using a fast reciprocating Langmuir probe in the HT-7 tokamak.With the increase of the central line averaged plasma density, an enhanced shear of the radial electric field was observed at plasma edge, which could account for the reduction of edge transport and the improvement of global particle confinement. The reduced particle transport was demonstrated by the increase of the particle confinement time and the decrease of the perpendicular diffusion coefficient. The features of the ionization-and-radiation-driven turbulence, $\tilde{T}_{\rm e}/T_{\rm e}\sim \tilde{n}_{\rm e}/n_{\rm e}$ and $\theta_-\tilde{T}_{\rm e} \tilde{n}_{\rm e} \sim \pi $, were found in the plasma edge region, which suggests the importance of the ionization and radiation in the turbulence driving.
Keywords:  turbulence      boundary plasma      density scanning      particle confinement  
Received:  22 December 2003      Revised:  23 August 2004      Accepted manuscript online: 
PACS:  5225  
  5255  
Fund: Project supported by the National Natural Science Foundation of China (Grant No 10175069)

Cite this article: 

Xu Guo-Sheng (徐国盛), Wan Bao-Nian (万宝年), Song-Mei (宋梅) Boundary turbulence and transport in density scanning experiment on TH-7 tokamak 2005 Chinese Physics 14 159

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