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	Response of fuzzy tungsten surfaces to pulsed plasma bombardment
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
巻・号・頁	434(1-3),pp.230-234
国際共著	国際共著
著者・共著者	D. Nishijima,R.P. Doerner,D. Iwamoto,Y. Kikuchi,M. Miyamoto,M. Nagata,I. Sakuma,K. Shoda,Y. Ueda
概要	Damage of fuzzy tungsten surfaces due to a transient plasma load is characterized in terms of mass loss, surface morphology, and optical properties. A single D pulsed (∼0.1-0.2 ms) plasma shot with surface absorbed energy density of ∼1.1 MJ m-2 leads to a mass loss of ∼80 μg, which cannot be explained by physical sputtering. Thus, macroscopic erosion processes such as droplets and dust release as well as arcing are thought to be responsible for the mass loss. In fact, scanning electron microscopy observations reveal the melting of the tips of fuzz and arc tracks. The optical reflectivity of the damaged (melted) surface is measured to be higher than that of an undamaged fuzzy surface (below ∼0.01%). Spectroscopic ellipsometry shows that the refractive index, n, and extinction coefficient, k, increase from n ≈ 1 and k ≈ 0 for an undamaged fuzzy surface with an increase in the degree of damage of fuzz. © 2012 Elsevier B.V. All rights reserved.
DOI	10.1016/j.jnucmat.2012.10.042
ISSN	0022-3115