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	2016/10
形態種別	論文
査読	査読あり
標題	Optical transmittance investigation of 1-keV ion-irradiated sapphire crystals as potential VUV to NIR window materials of fusion reactors
執筆形態	共著・編著（代表編著を除く）
掲載誌名	AIP ADVANCES
掲載区分	国外
出版社・発行元	AMER INST PHYSICS
巻・号・頁	6(10)
著者・共著者	Keisuke Iwano,Kohei Yamanoi,Yuki Iwasa,Kazuyuki Mori,Yuki Minami,Ren Arita,Takuma Yamanaka,Kazuhito Fukuda,Melvin John F. Empizo,Keisuke Takano,Toshihiko Shimizu,Makoto Nakajima,Masashi Yoshimura,Nobuhiko Sarukura,Takayoshi Norimatsu,Masanori Hangyo,Hiroshi Azechi,Bess G. Singidas,Roland V. Sarmago,Makoto Oya,Yoshio Ueda
概要	We investigate the optical transmittances of ion-irradiated sapphire crystals as potential vacuum ultraviolet (VUV) to near-infrared (NIR) window materials of fusion reactors. Under potential conditions in fusion reactors, sapphire crystals are irradiated with hydrogen (H), deuterium (D), and helium (He) ions with 1-keV energy and similar to 10(20)-m(-2) s(-1) flux. Ion irradiation decreases the transmittances from 140 to 260 nm but hardly affects the transmittances from 300 to 1500 nm. H-ion and D-ion irradiation causes optical absorptions near 210 and 260 nm associated with an F-center and an F+-center, respectively. These F-type centers are classified as Schottky defects that can be removed through annealing above 1000 K. In contrast, He-ion irradiation does not cause optical absorptions above 200 nm because He-ions cannot be incorporated in the crystal lattice due to the large ionic radius of He-ions.
DOI	10.1063/1.4965927
ISSN	2158-3226/2158-3226