NDLI: Research and Development of Large-Aperture Hybrid Photo-Detectors for Hyper-Kamiokande

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Research and Development of Large-Aperture Hybrid Photo-Detectors for Hyper-Kamiokande

Content Provider	Semantic Scholar
Author	Suda, Yusuke
Copyright Year	2014
Abstract	We have developed the prototype of the 8-inch Hybrid Photo-Detector (HPD) and the high quantum efficiency (QE) 20-inch photomultiplier tube (PMT) for Hyper-Kamiokande (Hyper-K) which is proposed as a next generation Megaton class water Cherenkov detector. Our goal is to develop the high-QE 20-inch HPD which satisfies the requirements to photosensors in Hyper-K. We evaluated the performance of the 8-inch HPD. The timing resolution for single photoelectron, the single photocelectron charge resolution, and the dark rate at 0.5 photoelectron threshold are measured to be 1.2 ns (1 σ), 12 %, and 2 kHz, respectively. To ensure the usability of HPD and high-QE PMT, we evaluate the performance in a 200 ton water tank as a sensor for a water Cherenkov detector. For the test in the tank, we checked the durability and safety in water of the 8-inch HPD. No trouble has been found. We calibrated the gain of the sensors before installation. Then, we installed eight 8-inch HPDs, five high-QE PMTs and 227 normal-QE PMTs into the tank. The installation of the sensors is successfully completed and the cosmic muon events were observed in the tank. The single photoelectron resolution of the 8-inch HPD in the tank is better than that of PMT. Because of the low temperature in the tank and closing the tank for two months, the dark rate of the 8-inch HPD decreases. The dark rate of the highQE PMTs measured in the tank is comparable to that of the normal ones. This is the first time to operate HPD and sensor which has a high-QE photocathode as a sensor for a water Cherenkov detecter. Through the test in the tank and more precise measurement, we plan to decide the photosensors for Hyper-K in 2016.
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://hep.phys.s.u-tokyo.ac.jp/publish/theses/master/mth2014_suda.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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