We have been developing new photodetectors for Hyper-Kamiokande a proposed next generation megaton-class water Cherenkov detector. Our goal is to develop a high performance photodetector with 20-inch diameter photocathode, which can be used in a water Cherenkov detector for a long time. Two types of new photodetectors are under development; Hybrid Photo-Detectors (HPDs) and photo-multiplier tubes (PMTs) with box-and-line type dynode. High quantum efficiency (QE) photocathode has been developed as a common option for both types. We have been testing 8-inch HPDs and high-QE 20-inch PMTs with conventional Venetian blind dynode in a 200-ton water Cherenkov detector since August 2013. We confirmed that the 8-inch HPD shows better performance than PMTs in the tank. Based on the successful development of 8-inch HPDs and high-QE PMTs, we developed prototypes of 20-inch high-QE HPDs and box-and-line PMTs. We measured the basic performance of 20-inch photodetectors and confirmed HPDs and box-and-line PMTs have much better timing and charge resolution than those of Venetian blind PMTs.
|ジャーナル||Proceedings of Science|
|出版物ステータス||Published - 2014 1 1|
|イベント||3rd Technology and Instrumentation in Particle Physics Conference, TIPP 2014 - Amsterdam, Netherlands|
継続期間: 2014 6 2 → 2014 6 6
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