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	2009/06
形態種別	論文
査読	査読あり
標題	The effects of high fluence mixed-species (deuterium, helium, beryllium) plasma interactions with tungsten
執筆形態	共著・編著（代表編著を除く）
掲載誌名	JOURNAL OF NUCLEAR MATERIALS
掲載区分	国外
出版社・発行元	ELSEVIER SCIENCE BV
巻・号・頁	390-91,pp.886-890
国際共著	国際共著
著者・共著者	M. J. Baldwin,R. P. Doerner,D. Nishijima,K. Tokunaga,Y. Ueda
概要	W targets are exposed to D-2-Be, He, D-2-He and D-2-Be-He plasmas in the linear-plasma-device PISCES-B to simulate the conditions expected at W strike-points in an ITER all W metal divertor scenario. in D-2-Be and He plasmas, target temperatures in the range 1070-1320 K lead to surface layers of Be-W alloy or nano-structured W morphology, respectively, but below 900 K, neither types of layer are found to form. Both processes have kinetics reminiscent of diffusion. Alloying kinetics are optimal when surface Be availability is maximized through the formation of a deposited Be over-layer. Nano-structured layer growth at 1120 K is most rapid for incident He ion fluxes above 7 x 10(21) m(-2)s(-1). In D-2-0.1 He plasmas, a mixture relevant to divertor exhaust, small Be or C fractions can significantly reduce nano-structure growth in favor of the formation of a mixed material Be-W alloy or C layer. (C) 2009 Elsevier B.V. All rights reserved.
DOI	10.1016/j.jnucmat.2009.01.247
ISSN	0022-3115/1873-4820