Performance evaluation of new photodetectors for Hyper-Kamiokande

3 Jun 2014, 11:20
20m
Veilingzaal (Beurs van Berlage)

Veilingzaal

Beurs van Berlage

Oral Experiments: 2c) Detectors for neutrino physics II.c Neutrino

Speaker

Mr Yusuke Suda (Department of Physics, University of Tokyo)

Description

We have been developing new photodetectors for the Hyper-Kamiokande (Hyper-K) detector, which is proposed as a next generation Megaton class water Cherenkov detector. There are three candidate photodetectors; One is a 20-inch venetian blind dynode type PMT (R3600) which is used in Super-Kamiokande. Second is a newly developed box and line dynode type PMT which has a better collection efficiency and timing response than R3600. The other one, a large-aperture Hybrid Photo-Detector (HPD), is also newly developed and uses an avalanche diode instead of dynodes to multiply photoelectrons. Compared to PMT, the HPD has a simpler structure, better collection efficiency, better timing response, and better single photoelectron charge resolution. A high quantum efficiency (QE) is a common option for the three candidates and it was applied for the R3600 at first. The high-QE R3600 has 30 % QE at maximum peak, 1.4 times higher than that of the R3600 used in Super-Kamiokande. In order to evaluate the performance and usability of the candidate photodetectors, we perform a long-term test with a 200-ton water Cherenkov detector located in Kamioka mine. The progress of the long-term test of 8-inch HPDs and high-QE R3600s will be reported. The status of R & D of the 20-inch box & line PMTs and 20-inch HPDs will be also presented. We plan to choose the photodetectors for Hyper-K in 2016.

Primary author

Mr Yusuke Suda (Department of Physics, University of Tokyo)

Co-authors

Dr Akimichi Taketa (Earthquake Research Institute, University of Tokyo) Dr Hidekazu Tanaka (Kamioka Observatory, Institute for Cosmic Ray Research, University of Tokyo) Prof. Hiroaki Aihara (Department of Physics, University of Tokyo) Prof. Masashi Yokoyama (Department of Physics, University of Tokyo) Prof. Masato Shiozawa (Kamioka Observatory, Institute for Cosmic Ray Research, University of Tokyo) Dr Masatoshi Suzuki (Hamamatsu Photonics K.K.) Ms Seiko Hirota (Department of Physics, Kyoto University) Dr Shoei Nakayama (Kamioka Observatory, Institute for Cosmic Ray Research, University of Tokyo) Dr Takayuki Ohmura (Hamamatsu Photonics K.K.) Prof. Tsuyoshi Nakaya (Department of Physics, Kyoto University) Dr Yasuhiro Nishimura (Research Center for Cosmic Neutrinos, Institute for Cosmic Ray Research, University of Tokyo) Dr Yoshihiko Kawai (Hamamatsu Photonics K.K.) Prof. Yoshinari Hayato (Kamioka Observatory, Institute for Cosmic Ray Research, University of Tokyo) Mr Yuji Okajima (Department of Physics, Tokyo Institute of Technology)

Presentation Materials