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.
Received: 18 March 2005
Revised: 08 August 2005
Accepted manuscript online:
(Fusion products effects (e.g., alpha-particles, etc.), fast particle effects)
Fund: Project supported by the National Natural Science Foundation of China (Grant No 10235010).
Cite this article:
Zhou Qian (周倩), Wan Bao-Nian (万宝年), Wu Zhen-Wei (吴振伟), Huang Juan (黄娟) The carbon impurity particle transport in ohmic discharges on the HT-7 tokamak 2005 Chinese Physics 14 2539
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