multi-PMT electronics system for Hyper-Kamiokande

Hyper-Kamiokande (Hyper-K) is a next generation underground water Cherenkov detector designed to study neutrinos from J-PARC accelerator and astronomical sources, nucleon decay, with the main focus on the determination of leptonic CP violation. To detect the weak Cherenkov light generated by neutrino interactions or proton decay, the newly developed 20"-PMTs by Hamamatsu will be used. The addition of a system of small photomultipliers as implemented in the KM3NeT experiment, the so called multi-PMT module (mPMT), is considered to improve the Hyper-K physics capability. The mPMT system consists of a pressure resistant vessel with inside 19 3"-PMTs and all the electronics required for the system, with a power budget of only 4 W. An overview of the developed electronics system, that has been fully validated and it is now ready for the mass production, is presented.