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New large aperture, hybrid photo-detector and photo multiplier tube for a gigantic water Cherenkov ring imaging detector

2014; Elsevier BV; Volume: 766; Linguagem: Inglês

10.1016/j.nima.2014.06.010

1872-9576

Seiko Hirota, Yasuhiro Nishimura, Y. Suda, Yuji Okajima, M. Shiozawa, S. Nakayama, Hidekazu Tanaka, Y. Hayato, M. Ikeda, M. Nakahata, M. Yokoyama, H. Aihara, A. K. Ichikawa, A. Minamino, Kunxian Huang, T. Nakaya, Yoshihiko Kawai, Masatoshi Suzuki, Takayuki Ohmura,

Neutrino Physics Research

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.