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	2011/08
形態種別	論文
査読	査読あり
標題	Analysis of tungsten melt-layer motion and splashing under tokamak conditions at TEXTOR
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	51(8)
国際共著	国際共著
著者・共著者	J. W. Coenen,V. Philipps,S. Brezinsek,B. Bazylev,A. Kreter,T. Hirai,M. Laengner,T. Tanabe,Y. Ueda,U. Samm
概要	Behaviour and characteristics of W plasma-facing components under impinging high heat fluxes are investigated in view of the material choices for the divertor in future devices such as ITER and DEMO. Experiments have been carried out in the plasma edge of the TEXTOR tokamak to study melt-layer motion, macroscopic tungsten erosion from the melt layer as well as the changes in material properties such as grain size and abundance of voids or bubbles. The parallel heat flux at the radial position of the plasma-facing components (PFCs) in the plasma ranges around q(parallel to) similar to 45 MW m(-2) allowing samples to be exposed at an impact angle of 35 degrees to 20-30 MW m(-2). Melt-layer motion perpendicular to the magnetic field is observed following a Lorentz force originating from thermoelectric emission of the hot sample. Up to 3 g of molten W are redistributed forming mountain-like structures at the edge of the sample. The typical melt-layer thickness is 1-1.5 mm.
DOI	10.1088/0029-5515/51/8/083008
ISSN	0029-5515/1741-4326