研究者情報 | 神奈川大学

タムラ　タダヒサ Tamura Tadahisa 田村　忠久所属神奈川大学工学部応用物理学科神奈川大学大学院工学研究科工学専攻（応用物理学領域）職種教授
言語種別	日本語
発行・発表の年月	2011/08
形態種別	学術雑誌
標題	The Event Trigger System for CALET
執筆形態	共著
掲載誌名	32ND INTERNATIONAL COSMIC RAY CONFERENCE, BEIJING 2011
巻・号・頁	6,380-383頁
著者・共著者	YOSHITAKA UEYAMA, SHOJI TORII, KATSUAKI KASAHARA, HIROYUKI MURAKAMI, SHUNSUKE OZAWA, YOSUI AKAIKE, TAE NIITA, MASANORI NAKAMURA, KEISUKE YOSHIDA, TADAHISA TAMURA, SHOJI OKUNO, YUSAKU KATAYOSE AND YUKI SHIMIZU
概要	The CALorimetric Electron Telescope, CALET, is a mission to study high energy phenomena in the universe by observing high energy cosmic rays (electrons, gamma rays, and nuclei) on the International Space Station. The instrument consists of a segmented plastic scintillator charge-measuring module, an imaging calorimeter consisting of 8 scintillating fiber planes interleaved with tungsten plates of 3 radiation length, and a total absorption calorimeter consisting of orthogonal PWO logs of 27 radiation length. It is necessary to eliminate the background events, mostly low energy protons that prevent efficient observation of high energy cosmic rays. Therefore, CALET has an on-board trigger system to select events which are 1) high energy showers, 2) low energy showers and 3) non-interacting protons or heavy nuclei. These triggers are generated by a combination of the signals from the charge detector, the imaging calorimeter, and the top layer of PWO in the total absorption calorimeter. A CERN-SPS beam test of the CALET prototype detector was carried out by using muons, electrons, and hadrons. We introduce the CALET trigger system and present its performance verified during the beam test.