Performance of 50 cm Photomultiplier Tube for Hyper-Kamiokande

We developed a 50 cm-diameter photomultiplier tube (PMT) for Hyper-Kamiokande, which is a large water Cherenkov detector in Japan aiming at neutrino and nucleon-decay research by using forty thousand photosensors. The PMT, R12860 manufactured by Hamamatsu Photonics K.K. (Hamamatsu), achieved a doubl...

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Bibliographic Details
Published in:	2021 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC) pp. 1 - 3
Main Authors:	Maekawa, Yuto, Fujisawa, Chiori, Nishimura, Yasuhiro
Format:	Conference Proceeding
Language:	English
Published:	IEEE 16-10-2021
Subjects:	Detectors Electron tubes Image resolution Neutrino Neutrino sources Noise reduction Photodetectors Photomultipliers Timing Water Cherenkov Detector
Online Access:	Get full text
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Summary:	We developed a 50 cm-diameter photomultiplier tube (PMT) for Hyper-Kamiokande, which is a large water Cherenkov detector in Japan aiming at neutrino and nucleon-decay research by using forty thousand photosensors. The PMT, R12860 manufactured by Hamamatsu Photonics K.K. (Hamamatsu), achieved a double detection efficiency, reduced timing and charge resolutions as well as sufficient mechanical strength compared with a prior 50 cm PMT, R3600 for Super-Kamiokande. In 2018 over a hundred of the R12860 PMTs were installed in Super-Kamiokande, where we evaluated the performance together with the R3600 PMTs. The collection efficiency reached 95% with a higher quantum efficiency (QE) of 33% typical at peak of wavelength around 400 nm. Charge resolution was evaluated to be 27% in standard deviation and time resolution to be 1.5 nanoseconds in FWHM. Finally, noise reduction succeeded with clean materials and low dark count rate.
ISSN:	2577-0829
DOI:	10.1109/NSS/MIC44867.2021.9875925