Brightness enhancement of a linac-based intense positron beam for total-reflection high-energy positron diffraction (TRHEPD)

陽電子回折実験のための加速器ベース高強度陽電子ビームの輝度増強

前川 雅樹; 和田 健*; 深谷 有喜   ; 河裾 厚男; 望月 出海*; 設楽 哲夫*; 兵頭 俊夫*

Maekawa, Masaki; Wada, Ken*; Fukaya, Yuki; Kawasuso, Atsuo; Mochizuki, Izumi*; Shidara, Tetsuo*; Hyodo, Toshio*

The brightness of a linac-based intense positron beam was enhanced for reflection high-energy positron diffraction (RHEPD) measurements. It gave more than 60 times intensified diffraction pattern from a Si(111)-77 reconstructed surface compared to a previous result with a Na-based positron beam. An improved signal-to-noise ratio in the obtained pattern due to the intensified beam allowed to observe clear fractional-order spots in the higher Laue-zones, those had not been observed previously.