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	2007/10
形態種別	論文
査読	査読あり
標題	Effects of repetitive ELM-like heat pulses on tungsten surface morphology
執筆形態	共著・編著（代表編著を除く）
掲載誌名	FUSION ENGINEERING AND DESIGN
掲載区分	国外
出版社・発行元	ELSEVIER SCIENCE SA
巻・号・頁	82(15-24),pp.1904-1910
担当区分	筆頭著者
著者・共著者	Y. Ueda,M. Toda,M. Nishikawa,K. Kondo,K. A. Tanaka
概要	The effects of ELM-like heat pulses on tungsten surface morphology were studied by using a fundamental wave (wavelength of 1.06 mu m) of a YAG laser, which was operated in a multi-pulsed mode with an effective pulse length of about 100 mu m, typical pulse length of ELMs. Tungsten base temperature was 640 degrees C, heated by a sheath heater and laser pulse heating. The energy absorption rate of the laser light was about 30% for mirror finished surface. Under non-melting conditions (laser pulse energy fluence: <= 0.1 kJ/cm(2)), roughening and cracking formation within the laser spot appeared. As the energy fluence decreased, the larger shot number was necessary for the surface morphology change to appear. Even at the highest temperature of around 1240 degrees C, surface roughening and fine cracking appeared at the large shot number (200,000 shots). (C) 2006 Elsevier B.V. All rights reserved.
DOI	10.1016/j.fusengdes.2006.12.002
ISSN	0920-3796