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Suppression of hydrogenated carbon film deposition by scavenger techniques and their application to the tritium inventory control of fusion devices

F L Tabarés, D Tafalla, I Tanarro, V J Herrero, A Islyaikin, C Maffiotte2002年Plasma Physics and Controlled FusionIF 2.2出版社

The well-known radical and ion scavenger techniques of application in amorphous hydrogenated carbon film deposition studies are investigated in relation to the mechanism of tritium and deuterium co-deposition in carbon-dominated fusion devices. A particularly successful scheme results from the injection of nitrogen into methane/hydrogen plasmas for conditions close to those prevailing in the divertor region of present fusion devices. A complete suppression of the a-C : H film deposition has been achieved for N2/CH4 ratios close to one in methane (5%)/hydrogen DC plasma. The implications of these findings in the tritium retention control in future fusion reactors are addressed.

日本語訳

よく知られたラジカルおよびイオン捕捉技術の非晶質水素化炭素膜堆積研究への応用は、炭素を主体とする核融合装置におけるトリチウムおよび重水素の共堆積のメカニズムに関連して調査されている。特に成功した手法は、現在の核融合装置のダイバータ領域に近い条件下で、メタン/水素プラズマへの窒素注入によってもたらされる。メタン(5%)/水素DCプラズマにおいて、N2/CH4比が1に近い場合、a-C:H膜の堆積が完全に抑制されることが達成された。これらの知見が将来の核融合炉におけるトリチウム保持管理に与える影響について考察する。

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