HT-7托卡马克全金属壁及锂化条件下辉光放电清洗的研究  

Glow Discharge Cleaning of Lithium Coated Full Metal Walls in HT-7 Tokamak

作　　者：毕海林[1] 胡建生[1] 余耀伟[1] 王小明[1] 

机构地区：[1]中科院等离子体物理研究所,合肥230031

出　　处：《真空科学与技术学报》2014年第7期731-736,共6页Chinese Journal of Vacuum Science and Technology

基　　金：国际热核聚变实验堆(ITER)计划专项(No.2014GB106005)

摘　　要：辉光放电清洗被广泛应用于聚变装置的壁处理,但是对于未来国际热核实验反应堆全金属壁条件下的实验运行,需要积累更多经验。HT-7托卡马克从2011年开始,采用全金属第一壁,包括钼限制器和不锈钢内衬,而且具有抑制杂质和降低再循环功能的锂化,也被HT-7用为常规的壁处理。研究发现,辉光放电清洗对于锂化金属壁同样具有杂质清除效果。全金属壁条件下,He辉光对于H,O,C的清除率分别达到4.2×1023,1.1×1022,2.4×1021atoms/h,锂化条件下,He辉光的清除率具有相似水平。此外,文章还研究了不同种类气体和壁温对于辉光效果的影响。先进超导托卡马克实验装置(EAST)不久也会采用钨偏滤器和钼第一壁,因此本文研究的内容对于全金属壁的EAST也同样具有重要意义。Glow Discharge Cleaning（GDC） of HT-7 Tokamak, which was modified in 2011 with installation of molyb- denum limiters, stainless steel liners, and full metal walls coated with lithium thin films to suppress impurity deposition and reduce the flux of ＂recycled＂ particles entering the plasma edge, was experimentally investigated. The results show that GDC is capable of effectively cleaning the lithium-coated metal walls and removing impurities. For example, in HeGDC of the full metal walls,the removal rates of hydrogen,oxygen,and carbon reached 4.2 × 10^23 ,1.1× 10^22,2.4× 10^21 atoms/h, respectively. Better results were obtained in He-GDC of lithium coated walls. The influence of the temperature and type of discharging gas on GDC efficiency was also evaluated. We suggest that the results be of much technological interest for Experimental Advanced Superconducting Tokamak, to be modified with full metal walls, tungsten diverters and molybdenum first walls, and for International Thermonuclear Experimental Reactor as well.

关 键 词：辉光放电清洗 壁处理 清除率 金属壁 锂化 

分 类 号：O539[理学—等离子体物理]