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SUMMARY:Water Cherenkov Detector for Study of Wavelength Shifting Plates
DTSTART;VALUE=DATE-TIME:20261030T150000Z
DTEND;VALUE=DATE-TIME:20261030T151500Z
DTSTAMP;VALUE=DATE-TIME:20261030T205410Z
UID:indico-contribution-6384@cern.ch
DESCRIPTION:Speakers: Nikita Shvarev (The Institute for Nuclear Research o
 f the Russian Academy of Sciences)\nThe Hyper-Kamiokande experiment [1] ai
 ms for a search for CP violation in neutrino oscillations\, proton decay\,
  measurements of solar and atmospheric neutrinos\, and other neutrino phys
 ics using a large water Cherenkov detector. The outer veto Chrenkov detect
 or will   use about 4000 optical modules based on PMT’s and   wavelength
 -shifting (WLS) plates [2]\, which enhances light collection efficiency an
 d improves particle identification.\n\nThis report describes the prototype
  of water Cherenkov detector constructed to evaluate the characteristics o
 f WLS plates under conditions of Hyper-Kamiokande. The prototype features 
 a scaled-down water tank and an outer detector module consisting of a 3-in
 ch Hamamatsu R14374 photomultiplier tube (PMT) [3] and a 30 × 30 cm\, 7 m
 m thick WLS plate. The water purification system of this detector has curr
 ently achieved a resistivity of approximately 8 MΩ·cm. Parameters of WLS
  plates were measured using cosmic-ray muons. It was obtained that such a 
 module (PMT plus WLS plate) increases light collection (the number of coll
 ected photons) by more than 2 times compared to the light collection of a 
 bare PMT. \n\nFuture work will focus on upgrading the water purification s
 ystem to achieve characteristics approaching those of ultrapure water. Acq
 uiring data to create a Monte Carlo model of the WLS plates' optical chara
 cteristics is also a part of the future plans.\n\n\nKey words: Hyper-Kamio
 kande outer detector\, Water Cherenkov detector\, Water purification syste
 m\, Wavelength-shifting (WLS) plates\, Hamamatsu R14374 photomultiplier tu
 be (PMT)\, PMT coupling\, Cherenkov light\n\n1. Hyper-Kamiokande Proto-Col
 laboration\, K. Abe\, Ke. Abe\, et al. Hyper-Kamiokande Design Report 28 N
 ovember 2018 https://doi.org/10.48550/arXiv.1805.04163\n2. Alexander Izmay
 lov\, Gleb Erofeev\, et al. Development of the Wavelength-Shifting Plate L
 ight Collector for the Outer Detector of Hyper-Kamiokande https://doi.org/
 10.22323/1.468.0112\n3. Hamamatsu Photonics K.K.\, Datasheet “Photomulti
 plier tubes R14374\, R14689” www.hamamatsu.com\n\nhttps://indico.particl
 e.mephi.ru/event/626/contributions/6384/
LOCATION: Conference Hall 5
URL:https://indico.particle.mephi.ru/event/626/contributions/6384/
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