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	2021/04
形態種別	論文
査読	査読あり
標題	Study on pulse shape dependence of tungsten mass erosion under disruption-like heat load
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
巻・号・頁	165
著者・共著者	Daichi Motoi,Kenzo Ibano,Yudai Kikuchi,Sho Saito,Takafumi Okita,Eiji Hoashi,Heun Tae Lee,Yoshio Ueda
概要	We have studied pulse waveform dependence of tungsten mass erosion under disruption-like heat loads. In the experiment, tungsten samples were placed in a vacuum chamber and irradiated by a disruption-like heat load using a 1064 nm Nd: YAG laser. Mass erosion of tungsten samples by laser irradiation was measured by a microbalance. Laser intensity (up to 6.2 GW/m2), pulse duration (4 ms–5 ms), and pulsed laser waveform were changed as parameters. Five types of pulsed laser waveforms were used to investigate the mass erosion of tungsten; Positive Ramp, Symmetric Ramp, Negative Ramp, Half Amp Square, Half Width Square. Among these waveforms, the largest mass erosion was observed in Half Width Square under the same absorbed energy condition. Also, when the volume of the molten layer is sufficiently large, the mass erosion will be greater due to evaporation of tungsten and the release of droplets.
DOI	10.1016/j.fusengdes.2020.112209
ISSN	0920-3796