2017 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, 特任助教 (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, 理工学研究科, 准教授 (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 |
The research carried out in FY2017 focussed on the design of the NuPRISM (J-PARC E61 experiment) Phase-0 detector, evaluation of photo-multiplier tubes (PMT) for the NuPRISM photodetectors, measurements of neutron backgrounds for the Phase-0 detector and development of NuPRISM simulation and reconstruction software. Three design options for the Phase-0 detector were developed in collaboration with a general construction company and used to evaluate the Phase-0 program within the NuPRISM collaboration. New 3-inch diameter PMTs from Hamamatsu were received and measurements of the PMT performance including timing resolution and pulse width were made. These measurements are being used as inputs to the design of readout electronics and the detector simulation. At J-PARC, the neutron background was measured using a He-3 counter and Bonner Ball moderators. The beam induced neutron measurement is being used to tune the simulation of neutrons. The new multi-PMT photosensors were implemented in the simulation (WCSim) and reconstruction (fiTQun) software for the NuPRISM detector. This software is being used by both the NuPRISM and Hyper-K collaborations to model detector performance and make design decisions.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
Most of the objectives for FY2017 have been achieved, with minor modifications to the research plan. The photo-multiplier tube (PMT) test stand is operating at Kavli IPMU and taking measurements of PMTs.Neutron background measurements at J-PARC have been taken using with an He-3 counter with moderators. The Phase-0 detector design has been completed with three design options for the detector located on the surface, in a fully excavated pit and in a partially excavated pit. The Cockroft-Walton high voltage base has been identified as appropriate high voltage solution for the photo-sensor. Measurements of the PMT dark rate have identified a cathode-grounded configuration with positive polarity high voltage as desired configuration for the high voltage, and a plan to produce a positive polarity high voltage base is being developed.
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| Strategy for Future Research Activity |
From FY2018, the following research objectives will be pursued. The detector design will now focus on the Phase-1 detector since the Phase-1 detector design has become a high priority for decisions concerning the detectors adoption as a near detector for the proposed Hyper-Kamiokande experiment. The positive high voltage PMT base will be developed in collaboration with Hamamatsu Photonics. The photosensor development and testing will now focus on the construction of a fully integrated multi-PMT module that can be tested submerged in a water environment.
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Research Products
(8 results)
