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.
|Journal||Proceedings of Science|
|Publication status||Published - 2014 Jan 1|
|Event||3rd Technology and Instrumentation in Particle Physics Conference, TIPP 2014 - Amsterdam, Netherlands|
Duration: 2014 Jun 2 → 2014 Jun 6
ASJC Scopus subject areas