Abstract In this paper the density profile behaviour and the particle confinement operation regime on HL-1M have been studied under the pellet injection (PI),supersonic molecular beam injection (SMBI), gas puffing (GP) and lower hybrid current drive experimental situations. The relationships between density profile, particle confinement time and edge safe factor have been explored. The density profile, which is measured by six-channel far-infrared ray laser interferometer has been analysed by using the peaking coefficient calculation code. Changes of the outward and inward diffusion velocities before and after the peaking of the central density profile have been calculated using the global particle balance equations. The particle confinement operation regimes have been discussed. The peaking density profile can be easily obtained under the condition of efficient fuelling. In ohmic discharges, confinement time increases as the peaking density profile factor rises, and is saturated at a critical value related to the fuelling efficiency. The particle confinement time of SMBI lies between the values of GP and PI, and its value is about 3--5 times of the energy confinement time.
Received: 15 October 2004
Revised: 15 April 2005
Accepted manuscript online:
Fund: Project supported by the National Science Foundation of China (Grant Nos 10075016, 10275018 and
10135020).
Cite this article:
Jiao Yi-Ming (焦一鸣), Zhou Yan (周艳), Deng Zhong-Chao (邓中朝), Ding Xuan-Tong (丁玄同), Liu Yong (刘永), Wang En-Yao (王恩耀) Particle confinement and density profile behaviour on HL-1M 2005 Chinese Physics 14 1600
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