2018 Fiscal Year Annual Research Report
Development of the NuPRISM Detector Towards the Measurement of CP Violation
| Project/Area Number |
17H02885
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| Research Institution | The University of Tokyo |
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Principal Investigator |
HARTZ MARK 東京大学, カブリ数物連携宇宙研究機構, 准教授 (70721702)
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| Co-Investigator(Kenkyū-buntansha) |
久世 正弘 東京工業大学, 理学院, 教授 (00225153)
石塚 正基 東京理科大学, 理工学部物理学科, 准教授 (40533196)
西村 康宏 東京大学, 宇宙線研究所, 助教 (40648119)
石田 卓 大学共同利用機関法人高エネルギー加速器研究機構, 素粒子原子核研究所, 研究機関講師 (70290856)
角野 秀一 首都大学東京, 理学研究科, 教授 (70376698)
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| Project Period (FY) |
2017-04-01 – 2020-03-31
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| Keywords | Neutrino / Water Cherenkov / Photosensors / Detector / Neutrino Scattering |
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| Outline of Annual Research Achievements |
Water tank of intermediate water Cherenkov detector will be installed to vertical pit with the depth of 50m to 100m and the tank will be lifted up and down in the pit to measure the neutrino flux at different off-axis angles from the beam center. We carried out the design of the full system of the detector setup including water tank, lifting mechanism and vertical pit by consulting with construction consulting companies. We worked closely with them and succeeded to establish conceptual design of the full detector system. We employed the idea provided by the consulting company to use buoyancy to change the position of the water tank in the vertical pit. Layout of the vertical pit and lifting mechanism were determined this year. This is significant achievement to proceed further detailed design to realize the moving water Chrenkov detector for precision measurement in future neutrino oscillation experiment using the high intensity neutrino beam. The intermediate water Cherenkov detector will be instrumented with 8 cm diameter photo-multiplier tubes (PMTs). We completed test stands for the PMTs and carried out tests to characterize their performance. These tests included measurements of gain, charge resolution, timing resolution, dark rate and magnetic field susceptibility. The results of these measurements were incorporated in the simulation of the detector to determine their impact on the detector performance. PMTs from Hamamatsu photonics and HZC photonics were tested. Initial design work for a Cockroft-Walton high voltage source for PMTs was started with Hamamatsu.
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| Current Status of Research Progress |
Current Status of Research Progress
3: Progress in research has been slightly delayed.
Reason
The original research plan includes the assembly of a multi-PMT prototype module by collaborators on this grant. It was planned that this module will use components developed by collaborators at TRIUMF laboratory. The production of the prototype was delayed due to problems encountered in the production of a number of prototype parts. Primarily, the production of the readout electronics for the prototype has been delayed until FY2019, and the module will not be ready for testing until FY2020.
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| Strategy for Future Research Activity |
Based on the delay of the multi-PMT prototype production, the assembly and full optical testing of the multi-PMT module has been moved outside of the scope of this project and will be the responsibility of TRIUMF. To compensate, the project will cover additional testing of the multi-PMT material properties. These tests include pressure tolerance of the multi-PMT container for operation under water, compatibility testing of the multi-PMT container materials with ultra-pure water and Gadolinium Sulfate loaded water, and testing of the Radon emanation of components in the multi-PMT container.
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