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1Enhanced Plasma Performance by ICRF Boronization显示文摘Boronization with carborane (C2B10H12) by ICRF has been applied routinely to the walls of HT-7 super-conducting tokamak for the reduction of impurity influx, especially carbon and oxygen. Significant suppression of metallic impurities and radiating power fraction are achieved. The improved confinement for both particle and energy is observed in full range of operation parameters. Energy balance analysis shows that electron heat diffusion coefficient is strongly reduced. Measurements by Langmuir probes at the edge plasma show that the poloidal velocity shear after boronization is changed to a profile favoring to good confinement. The main emphasis of this paper is to describe effects of boronization on aspects of the enhanced plasma performance.万宝年 赵燕平 李建刚 宋梅 吴振伟 罗家融 李成富 王小明 2002Plasma Science and Technology2002,4,4:1
2Removal of Particles by ICRF Cleaning in HT-7 Superconducting Tokamak显示文摘The ICRF (Ion Cyclotron Range Frequency) cleaning technique has been used as a routine wall cleaning method in the HT-7 superconducting tokamak. In a wide range of toroidal field, the removal rate of residual gas by ICRF cleaning was about twenty times higher than that of glow discharge cleaning (GDC). At different gas pressure and RF power levels, the ICRF cleaning is studied carefully. A good impurity cleaning effect and a very high hydrogen removal rate were obtained. The removal rate of hydrogen by 5 kW ICRF cleaning achieved was 1.6 × 10-5 Tirr.1/s.And the relationships among pressure P, outgassing rate Q, atomic layers L absorbed on surface and the cleaning mode were discussed briefly.胡建生 李建刚 张守银 辜学茂 张晓东 赵燕平 宫先祖 匡光力 李成富 罗家融 王小明 高翔 万宝年 谢纪康 万元熙 2001Plasma Science and Technology2001,3,1:0
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