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Impurity Behaviors under Wall Conditioning in HL-2A
Zhengying Cui,Chenghe Cui,Mingxu Wang,Ping Sun,Quanming Wang,Wei Li,Yudong Pan,Zeng Cao 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
Impurities are one of the key issues of tokamak plasma research, as they are directly related to plasma quality and steady-state operation. The HL-2A device with two close divertor is the first divertor tokamak in China. It was successfully constructed in 2002 and has been operated for three 3 years up to now. In the 2004 campaign, siliconization as a wall conditioning was first done on the HL-2A tokamak by using glow discharge cleaning (GDC) with a gas mixture of SiH4 + He. The effects of siliconization on impurities and recycling are investigated, as well as the lifetime of siliconization, in this paper. The intensity of oxygen line is remarkably decreased after siliconization. Radiation of silicon line rapidly decreases shot by shot just after siliconization, but the effect of siliconization on the plasma properties is present all along and decreases gradually for a large amount of discharges. The effect of the siliconization can be maintained to about 180 discharges with similar discharge parameters.