摘要
一种交流放电原位碳化技术首次在HL-1装置环形真空室内壁进行了试验。碳沉积膜样品作了扫描电镜,俄歇电子能谱和二次离子能谱深度轮廓和成分分析。壁碳化前后托卡马克放电杂质可见光谱和真空紫外光谱强度对照分折表明,碳化壁状态下,孔烂和金属壁材料Mo和Cr等在等离子体中含量下降80％左右,而C,O等轻杂质量有所上升;氢粒子约束时间τ_p和再循环率系数R较裸金属壁状态大致增加20％。碳化壁经惰性气体He或Kr放电锻炼后,在托卡马克放电中壁表面显示出明显的抽吸作用。
The wall surface carbonization experiment was carried out in the HL-1 tokamak with AC discharge (50Hz, 2kw) in a gas mixture (CH4:H2=1:4-4:1, 5×10-3Pa). The samples exposed to carbonization have been analysed by AES and SIMS. No limiter material Mo deposition was found. Molybdenum concentration inthe HL-1 plasma is reduced to 20% of that before carbonization. Particle confinement time τp and hydrogen recycling coefficientR increase by about 20%.
出处
《核聚变与等离子体物理》
CAS
CSCD
北大核心
1992年第1期15-20,共6页
Nuclear Fusion and Plasma Physics
关键词
器壁碳化
托卡马克
放电
杂质
HL-1 tokamak, Carbonization, Wall condition, Hydrogen recycling.
