中国物理B ›› 2005, Vol. 14 ›› Issue (12): 2539-2545.doi: 10.1088/1009-1963/14/12/027

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The carbon impurity particle transport in ohmic discharges on the HT-7 tokamak

周倩, 万宝年, 吴振伟, 黄娟   

  1. Institute of Plasma Physics, Chinese Academy of Sciences Hefei 230031, China
  • 收稿日期:2005-03-18 修回日期:2005-08-08 出版日期:2005-12-20 发布日期:2005-12-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 10235010).

The carbon impurity particle transport in ohmic discharges on the HT-7 tokamak

Zhou Qian (周倩), Wan Bao-Nian (万宝年), Wu Zhen-Wei (吴振伟), Huang Juan (黄娟)   

  1. Institute of Plasma Physics, Chinese Academy of Sciences Hefei 230031, China
  • Received:2005-03-18 Revised:2005-08-08 Online:2005-12-20 Published:2005-12-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 10235010).

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摘要： The line-integrated optical measurement of impurity radiation profiles for the study of light impurity transport is performed in the HT-7 tokamak. The carbon impurity line emissivity is obtained by Abel inversion. The radial transport behaviours of carbon impurities at different central line averaged electron densities \overline {n_\e} are investigated in ohmic discharges. The diffusion coefficient D_{k}(r), the convection velocity W_{k}(r) and the total flux of the impurity ions \Ga _{k} decrease with the increase of \overline {n_\e} , which shows a reduction in the impurity particle transport at higher electron densities.

关键词: tokamak, impurity particle transport, diffusion coefficient, convection velocity

Abstract: The line-integrated optical measurement of impurity radiation profiles for the study of light impurity transport is performed in the HT-7 tokamak. The carbon impurity line emissivity is obtained by Abel inversion. The radial transport behaviours of carbon impurities at different central line averaged electron densities $\overline{n_{\rm e}}$ are investigated in ohmic discharges. The diffusion coefficient $D_{k}(r)$, the convection velocity $W_{k}(r)$ and the total flux of the impurity ions $\varGamma _{k}$ decrease with the increase of $\overline{n_{\rm e}}$, which shows a reduction in the impurity particle transport at higher electron densities.

Key words: tokamak, impurity particle transport, diffusion coefficient, convection velocity

中图分类号:  (Tokamaks, spherical tokamaks)

  • 52.55.Fa
52.25.Fi (Transport properties) 52.25.Vy (Impurities in plasmas) 52.25.Os (Emission, absorption, and scattering of electromagnetic radiation ?) 52.55.Pi (Fusion products effects (e.g., alpha-particles, etc.), fast particle effects)