Hong Wen-Yu (洪文玉), Yan Long-Wen (严龙文), Qian Jun (钱俊), Pan Yu-Dong (潘宇东), Wang En-Yao (王恩耀), Luo Cui-Wen (罗翠文), Xu Zheng-Yu (徐征宇), Pan Li (潘莉), Li Qiang (李强), Yuan Bao-Shan (袁保山), Liu Li (刘莉), Ding Xuan-Tong (丁玄同)
Southwestern Institute of Physics, Chengdu 610041, China
Abstract The edge plasma characteristics are studied by both a movable array of Mach/Reynolds stress/Langmuir 10-probes in the boundary region and the fixed flush probe arrays on the 4 divertor neutralization plates at the same toroidal cross-section in the HL-2A tokamak. The dependence of the Reynolds stress on poloidal flow in the edge plasma is analysed. The result indicates that the sheared poloidal flow in tokamak plasma can be induced by the radial gradient of Reynolds stress. In the divertor experiments of HL-2A, the profiles of the electron temperature, density and floating potential on divertor plates are measured by the flush probe arrays. The edge electron temperature in divertor configuration is higher than that in limiter configuration. The temperature asymmetry between outer and inner target plates is observed. The result of magnetic surface reconstructed from 18 Mirnov coils signals is presented. Both the particle recycling and the impurity flux in the bulk plasma during divertor discharges are discussed. Neutral gas pressure in divertor chamber, measured by fast ionization gauge during divertor discharge, is given.
Received: 09 May 2005
Revised: 08 October 2005
Accepted manuscript online:
Hong Wen-Yu (洪文玉), Yan Long-Wen (严龙文), Qian Jun (钱俊), Pan Yu-Dong (潘宇东), Wang En-Yao (王恩耀), Luo Cui-Wen (罗翠文), Xu Zheng-Yu (徐征宇), Pan Li (潘莉), Li Qiang (李强), Yuan Bao-Shan (袁保山), Liu Li (刘莉), Ding Xuan-Tong (丁玄同) Analyses of edge plasma characteristics in HL-2A 2006 Chinese Physics 15 556
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