EAST超导托卡马克装置真空室壁处理的研究  

Wall cleanings for pre-treatment on EAST

作　　者：李加宏[1] 胡建生[1] 王小明[1] 余耀伟[1] 吴金华[1] 陈跃[1] 王厚银[1] 

机构地区：[1]中国科学院等离子体物理研究所,合肥230031

出　　处：《物理学报》2012年第20期310-316,共7页Acta Physica Sinica

基　　金：中国科技部ITER计划专项(批准号:2010GB104002);国家自然科学基金(批准号:10705030);中日等离子体和核聚变大学群项目资助的课题~~

摘　　要：壁处理技术被广泛应用于托卡马克装置上,以降低装置本底杂质水平,改善器壁的再循环.自2008年起,EAST面向等离子体的第一壁采用全碳材料,由于特殊的石墨晶体多孔结构,具有高放气率以及对H_2O,H_2等杂质气体的高吸附性,从而使等离子体放电前期的装置真空室壁处理尤为关键.本文介绍了EAST装置真空室壁处理的实验系统,并研究了装置烘烤与不同工作气体及工作参数下的直流辉光放电清洗对杂质粒子的清除效果.实验结果表明:EAST装置真空室在经过长时问的前期壁处理后,显著地降低了真空室内壁的出气率与本底杂质浓度,这对随后进行的等离子体放电实验非常有必要.Wall cleaning has been used popularly on tokamaks to reduce impurities and fuel recycling. Since 2008, the plasma facing components of EAST have been all of graphite. Due to the special crystal structure of graphite, high outgassing rate and strong absorption of hydrogen gas are induced. The wall cleaning is in particular important for the pre-treatment before the plasma operation of the machine. In this article, we introduce the wall conditioning system on EAST, and study the removal efficiency of device baking and glow discharge cleaning in different working gases and at different operating parameters. The long duration baking and GDC cleaning in EAST notably reduce the wall outgassing, and impurity radiation. After the cleanings, plasma is easily obtained, which is beneficial for the plasma physics experiment.

关 键 词：壁处理 直流辉光放电清洗 烘烤 

分 类 号：TL631.24[核科学技术—核技术及应用]