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	2013
形態種別	論文
査読	査読あり
標題	Microstructures and deuterium-retention behavior of tungsten exposed to D+(He and/or Be) mixture plasmas
執筆形態	共著・編著（代表編著を除く）
掲載誌名	Materials Transactions
掲載区分	国外
巻・号・頁	54(4),pp.420-424
国際共著	国際共著
著者・共著者	Mitsutaka Miyamoto,Daisuke Nishijima,Matthew J. Baldwin,Russell P. Doerner,Yoshio Ueda,Akio Sagara,Hiroaki Kurishita
概要	ITER-relevant mixed species (D, He, Be) plasma exposure experiments on microstructural changes and their impacts on D retention behavior in W are reviewed. It was observed that seeding of He into pure D plasma resulted in a significant reduction of D retention and suppression of surface blistering. TEM observations and ellipsometric measurements revealed that nano-sized high-density He bubbles were formed and percolated in the near surface region. Based on the experimental results, a mechanism to explain the reduced D retention was proposed, i.e., implanted D atoms can easily diffuse back to the surface through the percolating bubbles and escape from the surface during plasma exposure. Additional Be seeding to D+He mixture plasma suppressed this He seeding effect. Thus, it is considered that Be seeding has a more dominant influence than He seeding on microstructures and D retention in plasma-exposed W. © 2013 The Japan Institute of Metals.
DOI	10.2320/matertrans.MG201202
ISSN	1345-9678