ウエダ　ヨシオ   Ueda Yoshio   上田　良夫    所属   追手門学院大学  理工学部 電気電子工学科    職種   教授
言語種別	英語
発行・発表の年月	2004/01
形態種別	論文
査読	査読あり
標題	Impacts of carbon impurities in hydrogen plasmas on tungsten blistering
執筆形態	共著・編著（代表編著を除く）
掲載誌名	NUCLEAR FUSION
掲載区分	国外
出版社・発行元	INT ATOMIC ENERGY AGENCY
巻・号・頁	44(1),pp.62-67
担当区分	筆頭著者
著者・共著者	Y Ueda,T Shimada,M Nishikawa
概要	In order to study the effect of carbon impurities in plasmas on tungsten first walls, a hydrogen-carbon mixed ion beam was irradiated on tungsten. It was found that a very small amount of carbon (similar to0.3% or more) significantly enhanced blister formation. Small blisters appeared in a fluence of similar to10(23) H m(-2) and their number increased in the 10(24) H m(-2) range. Then, the size of the blisters increased towards the 10(25) H m(-2) range. According to XPS analysis, all the tungsten atoms near the top surface were combined with carbon atoms to form a tungsten carbide layer in the cases where significant blisters were observed. This layer prevented the implanted H from leaving the tungsten. As a result, it caused enhanced diffusion into the bulk, leading to blister formation.
DOI	10.1088/0029-5515/44/1/007
ISSN	0029-5515