New 50 cm photo-detectors for Hyper-Kamiokande

Research output: Contribution to journalConference article

Abstract

Two types of 50 cm-diameter photo-detectors were developed for Hyper-Kamiokande, a large water Cherenkov detector planned in Japan for neutrino and nucleon decay researches. A box-and-line dynode enabled further improvements on a 50 cm photomultiplier tube (PMT) used in Super-Kamiokande, which was developed to be an R12860 type by Hamamatsu Photonics K.K. (Hamamatsu). The collection efficiency reached 95%, superior to 67% of the PMT in Super-Kamiokande. It also gave a higher quantum efficiency of 30% typical at peak than 22% in case of the Super-Kamiokande. Another one is a 50 cm-diameter hybrid photo-detector (HPD), R12850 by Hamamatsu, using an avalanche diode for the amplification system. The detection efficiency is as high as the improved PMT, while the resolutions are highest among the existing 50 cm photo-detectors. At single photoelectron, charge resolutions were evaluated to be 35% and 15% in standard deviation and time resolutions to be 4.1 and 3.6 nsec in FWHM for the improved PMT and HPD, respectively. The glass bulb of both new photo-detectors sustained high pressure water up to 1.25 MPa. A newly developed cover for a long-term safe operation in Hyper-Kamiokande was validated at the 80 m deep water level even with a bulb implosion.

Original languageEnglish
JournalProceedings of Science
VolumePart F128556
Publication statusPublished - 2016 Jan 1
Externally publishedYes
Event38th International Conference on High Energy Physics, ICHEP 2016 - Chicago, United States
Duration: 2016 Aug 32016 Aug 10

Fingerprint

photomultiplier tubes
detectors
bulbs
dynodes
avalanche diodes
implosions
deep water
water
boxes
quantum efficiency
standard deviation
Japan
photoelectrons
neutrinos
photonics
glass
high resolution
decay

ASJC Scopus subject areas

  • General

Cite this

New 50 cm photo-detectors for Hyper-Kamiokande. / Nishimura, Yasuhiro.

In: Proceedings of Science, Vol. Part F128556, 01.01.2016.

Research output: Contribution to journalConference article

@article{deba661943c140d8acac3314d0c49534,
title = "New 50 cm photo-detectors for Hyper-Kamiokande",
abstract = "Two types of 50 cm-diameter photo-detectors were developed for Hyper-Kamiokande, a large water Cherenkov detector planned in Japan for neutrino and nucleon decay researches. A box-and-line dynode enabled further improvements on a 50 cm photomultiplier tube (PMT) used in Super-Kamiokande, which was developed to be an R12860 type by Hamamatsu Photonics K.K. (Hamamatsu). The collection efficiency reached 95{\%}, superior to 67{\%} of the PMT in Super-Kamiokande. It also gave a higher quantum efficiency of 30{\%} typical at peak than 22{\%} in case of the Super-Kamiokande. Another one is a 50 cm-diameter hybrid photo-detector (HPD), R12850 by Hamamatsu, using an avalanche diode for the amplification system. The detection efficiency is as high as the improved PMT, while the resolutions are highest among the existing 50 cm photo-detectors. At single photoelectron, charge resolutions were evaluated to be 35{\%} and 15{\%} in standard deviation and time resolutions to be 4.1 and 3.6 nsec in FWHM for the improved PMT and HPD, respectively. The glass bulb of both new photo-detectors sustained high pressure water up to 1.25 MPa. A newly developed cover for a long-term safe operation in Hyper-Kamiokande was validated at the 80 m deep water level even with a bulb implosion.",
author = "Yasuhiro Nishimura",
year = "2016",
month = "1",
day = "1",
language = "English",
volume = "Part F128556",
journal = "Proceedings of Science",
issn = "1824-8039",
publisher = "Sissa Medialab Srl",

}

TY - JOUR

T1 - New 50 cm photo-detectors for Hyper-Kamiokande

AU - Nishimura, Yasuhiro

PY - 2016/1/1

Y1 - 2016/1/1

N2 - Two types of 50 cm-diameter photo-detectors were developed for Hyper-Kamiokande, a large water Cherenkov detector planned in Japan for neutrino and nucleon decay researches. A box-and-line dynode enabled further improvements on a 50 cm photomultiplier tube (PMT) used in Super-Kamiokande, which was developed to be an R12860 type by Hamamatsu Photonics K.K. (Hamamatsu). The collection efficiency reached 95%, superior to 67% of the PMT in Super-Kamiokande. It also gave a higher quantum efficiency of 30% typical at peak than 22% in case of the Super-Kamiokande. Another one is a 50 cm-diameter hybrid photo-detector (HPD), R12850 by Hamamatsu, using an avalanche diode for the amplification system. The detection efficiency is as high as the improved PMT, while the resolutions are highest among the existing 50 cm photo-detectors. At single photoelectron, charge resolutions were evaluated to be 35% and 15% in standard deviation and time resolutions to be 4.1 and 3.6 nsec in FWHM for the improved PMT and HPD, respectively. The glass bulb of both new photo-detectors sustained high pressure water up to 1.25 MPa. A newly developed cover for a long-term safe operation in Hyper-Kamiokande was validated at the 80 m deep water level even with a bulb implosion.

AB - Two types of 50 cm-diameter photo-detectors were developed for Hyper-Kamiokande, a large water Cherenkov detector planned in Japan for neutrino and nucleon decay researches. A box-and-line dynode enabled further improvements on a 50 cm photomultiplier tube (PMT) used in Super-Kamiokande, which was developed to be an R12860 type by Hamamatsu Photonics K.K. (Hamamatsu). The collection efficiency reached 95%, superior to 67% of the PMT in Super-Kamiokande. It also gave a higher quantum efficiency of 30% typical at peak than 22% in case of the Super-Kamiokande. Another one is a 50 cm-diameter hybrid photo-detector (HPD), R12850 by Hamamatsu, using an avalanche diode for the amplification system. The detection efficiency is as high as the improved PMT, while the resolutions are highest among the existing 50 cm photo-detectors. At single photoelectron, charge resolutions were evaluated to be 35% and 15% in standard deviation and time resolutions to be 4.1 and 3.6 nsec in FWHM for the improved PMT and HPD, respectively. The glass bulb of both new photo-detectors sustained high pressure water up to 1.25 MPa. A newly developed cover for a long-term safe operation in Hyper-Kamiokande was validated at the 80 m deep water level even with a bulb implosion.

UR - http://www.scopus.com/inward/record.url?scp=85025841584&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85025841584&partnerID=8YFLogxK

M3 - Conference article

AN - SCOPUS:85025841584

VL - Part F128556

JO - Proceedings of Science

JF - Proceedings of Science

SN - 1824-8039

ER -