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.
Received: 22 December 2003
Revised: 23 August 2004
Accepted manuscript online:
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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