Performance evaluation of new photodetectors for Hyper-Kamiokande

Yusuke Suda, Yasuhiro Nishimura, Seiko Hirota, Yuji Okajima, Hiroaki Aihara, Masashi Yokoyama, Masato Shiozawa, Yoshinari Hayato, Shoei Nakayama, Hidekazu Tanaka, Tsuyoshi Nakaya, Akimichi Taketa, Yoshihiko Kawai, Takayuki Ohmura, Masatoshi Suzuki

Research output: Contribution to journalConference articlepeer-review

1 Citation (Scopus)


We have been developing new photodetectors for Hyper-Kamiokande a proposed next generation megaton-class water Cherenkov detector. Our goal is to develop a high performance photodetector with 20-inch diameter photocathode, which can be used in a water Cherenkov detector for a long time. Two types of new photodetectors are under development; Hybrid Photo-Detectors (HPDs) and photo-multiplier tubes (PMTs) with box-and-line type dynode. High quantum efficiency (QE) photocathode has been developed as a common option for both types. We have been testing 8-inch HPDs and high-QE 20-inch PMTs with conventional Venetian blind dynode in a 200-ton water Cherenkov detector since August 2013. We confirmed that the 8-inch HPD shows better performance than PMTs in the tank. Based on the successful development of 8-inch HPDs and high-QE PMTs, we developed prototypes of 20-inch high-QE HPDs and box-and-line PMTs. We measured the basic performance of 20-inch photodetectors and confirmed HPDs and box-and-line PMTs have much better timing and charge resolution than those of Venetian blind PMTs.

Original languageEnglish
Article number153
JournalProceedings of Science
Publication statusPublished - 2014
Externally publishedYes
Event3rd Technology and Instrumentation in Particle Physics Conference, TIPP 2014 - Amsterdam, Netherlands
Duration: 2014 Jun 22014 Jun 6

ASJC Scopus subject areas

  • General


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