中国物理B ›› 2005, Vol. 14 ›› Issue (1): 159-162.doi: 10.1088/1009-1963/14/1/029

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

徐国盛, 万宝年, 宋梅   

  1. Institute of Plasma Physics, Chinese Academy of Sciences, Hefei　230031}, China
  • 收稿日期:2003-12-22 修回日期:2004-08-23 出版日期:2005-01-20 发布日期:2005-01-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 10175069)

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)   

  1. Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China
  • Received:2003-12-22 Revised:2004-08-23 Online:2005-01-20 Published:2005-01-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 10175069)

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摘要： 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, ${\tilde {T}_\e } \mathord{\left/{\vphantom {{\tilde {T}_\e } {T_\e }}} \right. \kern-\nulldelimiterspace} {T_\e}\sim {\tilde {n}_\e } \mathord{\left/ {\vphantom {{\tilde {n}_\e } {n_\e }}}\right. \kern-\nulldelimiterspace} {n_\e }$ and $\theta \_\tilde {T}_\e \tilde {n}_\e \sim \pi $, were found in the plasma edge region, which suggests the importance of the ionization and radiation in the turbulence driving.

关键词: turbulence, boundary plasma, density scanning, particle　confinement

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.

Key words: turbulence, boundary plasma, density scanning, particle　confinement

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