EAST偏滤器V形区域冷却水管的防烧蚀保护

摘要

针对EAST前几轮实验中出现的偏滤器DOME板和外靶板间隙区域冷却水管被等离子体烧蚀破坏的问题,提出延伸外靶板石墨瓦结构以扩大打击面积和给冷却水管加装护套两种解决方案,并通过分析确定了具体参数.研究表明,适度的延伸外靶板可有效地防止高能粒子轰击靶板后水管,且对偏滤器区域流导影响不大；采用5mm壁厚高温耐熔钼管护套可有效地保护水管.后一轮的实验结果证明,该方案较好的解决了问题.%The in-vessel components worked very well in the past experiment runs and the main goals were achieved.Nevertheless,some damage was found,such as the ablation happened on graphite tiles,and the penetration happened on the water tubes around V area by the energetic particle bombardment as the power flux deposition was elevated locally.To protect the cooling pipes from damage,the outer graphite plate is extended for 20mm longer than the original one and a special structure using a group of node jacket pipes of 5mm which are made of molybdenum (Mo) material are designed.According to the theoretical and numerical analysis,we find that the effect of extension of the outer target on flow conductance is acceptable and the Mo material is the much more appropriate material and the thickness of 5mm can effectively protect the pipe.The following experimental results show that these adopted protecting measures solve the problems well.