Density and impurity profile behaviours in HL-2A tokamak with different gas fuelling methods
Cui Zheng-Ying(崔正英)†, Zhou Yan(周艳), Li Wei(李伟), Feng Bei-Bin(冯北滨), Sun Ping(孙平), Dong Chun-Feng(董春凤), Liu Yi(刘仪), Hong Wen-Yu(洪文玉), Yang Qing-Wei(杨青巍), Ding Xuan-Tong(丁玄同), and Duan Xu-Ru (段旭如)
Southwestern Institute of Physics, Chengdu 610041, China
Abstract The electron density profile peaking and the impurity accumulation in the HL-2A tokamak plasma are observed when three kinds of fuelling methods are separately used at different fuelling particle locations. The density profile becomes more peaked when the line-averaged electron density approaches the Greenwald density limit nG and, consequently, impurity accumulation is often observed. A linear increase regime in the density range ne < 0.6nG and a saturation regime in ne > 0.6nG are obtained. There is no significant difference in achieved density peaking factor fne between the supersonic molecular beam injection (SMBI) and gas puffing into the plasma main chamber. However, the achieved fne is relatively low, in particular, in the case of density below 0.7nG, when the working gas is puffed into the divertor chamber. A discharge with a density as high as 1.2nG, i.e. ne = 1.2nG, can be achieved by SMBI just after siliconization as a wall conditioning. The metallic impurities, such as iron and chromium, also increase remarkably when the impurity accumulation happens. The mechanism behind the density peaking and impurity accumulation is studied by investigating both the density peaking factor versus the effective collisionality and the radiation peaking versus density peaking.
Received: 08 November 2008
Revised: 23 December 2008
Accepted manuscript online:
Fund: Project supported partially by the
National Natural Science Foundation of China (Grant No 10475022).
Cite this article:
Cui Zheng-Ying(崔正英), Zhou Yan(周艳), Li Wei(李伟), Feng Bei-Bin(冯北滨), Sun Ping(孙平), Dong Chun-Feng(董春凤), Liu Yi(刘仪), Hong Wen-Yu(洪文玉), Yang Qing-Wei(杨青巍), Ding Xuan-Tong(丁玄同), and Duan Xu-Ru (段旭如) Density and impurity profile behaviours in HL-2A tokamak with different gas fuelling methods 2009 Chin. Phys. B 18 3473
Radiative divertor behavior and physics in Ar seeded plasma on EAST Jingbo Chen(陈竞博), Yanmin Duan(段艳敏), Zhongshi Yang(杨钟时), Liang Wang(王亮), Kai Wu(吴凯), Kedong Li(李克栋), Fang Ding(丁芳), Hongmin Mao(毛红敏), Jichan Xu(许吉禅), Wei Gao(高伟), Ling Zhang(张凌), Jinhua Wu(吴金华), Guang-Nan Luo(罗广南), EAST Team. Chin. Phys. B, 2017, 26(9): 095205.
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