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Performance improvement of a future gigantic detector for neutrinos and nucleon-decay searches by a new photo-detection system

Research Project

Project/Area Number 18K13559
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 15020:Experimental studies related to particle-, nuclear-, cosmic ray and astro-physics
Research InstitutionKeio University (2019-2021)
The University of Tokyo (2018)

Principal Investigator

NISHIMURA YASUHIRO  慶應義塾大学, 理工学部(矢上), 准教授 (40648119)

Project Period (FY) 2018-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2019: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2018: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Keywords検出器較正 / ニュートリノ / 光検出器 / 光源 / 核子崩壊
Outline of Final Research Achievements

I have studied a calibration device to improve the detection accuracy of the next-generation Hyper-Kamiokande experiment, which will probe neutrino and nucleon decay physics. The photon detection performance of the new photomultiplier tube for Hyper-Kamiokande is more than twice that of conventional ones, where accurate time calibration is important to reach the intrinsic performance. Therefore, I studied a diffuser ball light source that can emit a uniform amount of light while minimizing the time width of the pulsed light. Optimization of the magnesium oxide concentration and size of the resin that diffuses the pulsed light without impairing its temporal characteristics was investigated. A uniform irradiation was achieved by using a small diffusing resin with an increased concentration. The correlation between the design and the light attenuation or pulse width was obtained, enabling the design of a diffuse light source that meets the specifications.

Academic Significance and Societal Importance of the Research Achievements

国際規模の新たなニュートリノ研究拠点が国内外で計画されている中、今後のニュートリノ・核子崩壊研究は大統計の事象数による高精度測定が必要となる。大型検出器の広い光検出領域で検出精度を高めるには、短パルス光を一様に照射する光源が重要であり、他の大型実験でも転用を見込める。

Report

(5 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (8 results)

All 2022 2019 2018

All Presentation (8 results) (of which Int'l Joint Research: 5 results,  Invited: 4 results)

  • [Presentation] 大型水チェレンコフ検出器の較正に用いる光拡散ボールの性能向上2022

    • Author(s)
      岡崎玲大、西村康宏
    • Organizer
      新学術領域「ニュートリノで拓く素粒子と宇宙」 研究会
    • Related Report
      2021 Annual Research Report
  • [Presentation] ハイパーカミオカンデの光検出器高感度化2019

    • Author(s)
      西村康宏
    • Organizer
      Scintillator for Medical, Astroparticle and environmental Radiation Technologies
    • Related Report
      2019 Research-status Report
    • Invited
  • [Presentation] 100万トン水チェレンコフ検出器(ハイパーカミオカンデ)の開発研究2019

    • Author(s)
      西村康宏
    • Organizer
      令和元年度東京大学宇宙線研究所共同利用研究成果発表会
    • Related Report
      2019 Research-status Report
  • [Presentation] Photo sensor developments for neutrino experiments2019

    • Author(s)
      Yasuhiro NISHIMURA
    • Organizer
      The 21st International Workshop on Neutrinos from Accelerators
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] New Large Aperture Photodetectors for a Water Cherenkov Detector2019

    • Author(s)
      Yasuhiro Nishimura
    • Organizer
      The 16th Vienna Conference on Instrumentation
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Development of 50 cm Photo-Detectors for Hyper-Kamiokande2018

    • Author(s)
      Yasuhiro Nishimura
    • Organizer
      The 39th International Conference On High Energy Physics
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] The Hyper-Kamiokande Photodetector System using new 50 cm Photomultiplier Tubes2018

    • Author(s)
      Yasuhiro Nishimura
    • Organizer
      New and Enhanced Photosensor Technologies for Underground/underwater Neutrino Experiments
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Large Aperture Photodetectors for Water Cherenkov Detectors2018

    • Author(s)
      Yasuhiro Nishimura
    • Organizer
      Theory Meeting Experiment symposium
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited

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Published: 2018-04-23   Modified: 2023-01-30  

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