Author/Authors :
Hirota، نويسنده , , Seiko and Nishimura، نويسنده , , Yasuhiro and Suda، نويسنده , , Yusuke and Okajima، نويسنده , , Yuji and Shiozawa، نويسنده , , Masato and Nakayama، نويسنده , , Shoei and Tanaka، نويسنده , , Hidekazu and Hayato، نويسنده , , Yoshinari and Ikeda، نويسنده , , Motoyasu and Nakahata، نويسنده , , Masayuki and Yokoyama، نويسنده , , Masashi and Aihara، نويسنده , , Hiroaki and Ichikawa، نويسنده , , Atsuko and Minamino، نويسنده , , Akihiro and Huang، نويسنده , , Kunxian and Nakaya، نويسنده , , Tsuyoshi and Kawai، نويسنده , , Yoshihiko and Suzuki، نويسنده , , Masatoshi and Ohmura، نويسنده , , Takayuki، نويسنده ,
Abstract :
We are developing a 20-in. aperture high quantum efficiency photo-multiplier tube (PMT) and a hybrid photo-detector (HPD) for Hyper-Kamiokande which is a next generation underground large water Cherenkov detector. We have measured prototypes of 20-in. PMT with a high quantum efficiency photocathode, 30% at 400 nm, and 8-in. HPDs with a normal quantum efficiency photocathode, 22% at 400 nm, in a 200-ton water tank and checked their performance. The PMTs have a 2.7 ns (sigma) timing resolution and 43% (sigma) charge resolution for single photo-electron. Compared to PMTs, HPDs show a better performance with a 1.7 ns timing resolution and 32.
Keywords :
Cherenkov ring imaging detector , Hybrid photo-detector , High quantum efficiency , Hyper-Kamiokande , Neutrino
