中国物理B ›› 2006, Vol. 15 ›› Issue (3): 556-561.doi: 10.1088/1009-1963/15/3/019

• PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES • 上一篇    下一篇

Analyses of edge plasma characteristics in HL-2A

洪文玉, 严龙文, 钱俊, 潘宇东, 王恩耀, 罗翠文, 徐征宇, 潘莉, 李强, 袁保山, 刘莉, 丁玄同   

  1. Southwestern Institute of Physics, Chengdu 610041, China
  • 收稿日期:2005-05-09 修回日期:2005-10-08 出版日期:2006-03-20 发布日期:2006-03-20

Analyses of edge plasma characteristics in HL-2A

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)   

  1. Southwestern Institute of Physics, Chengdu 610041, China
  • Received:2005-05-09 Revised:2005-10-08 Online:2006-03-20 Published:2006-03-20

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摘要： 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.

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.

Key words: HL-2A tokamak, divertor configuration, movable probe array, flush probe array

中图分类号:  (Plasma-material interactions; boundary layer effects)

  • 52.40.Hf
52.70.Ds (Electric and magnetic measurements) 52.55.Fa (Tokamaks, spherical tokamaks) 52.55.Rk (Power exhaust; divertors) 52.35.Ra (Plasma turbulence) 52.30.-q (Plasma dynamics and flow)