Enhanced Photon Traps for Hyper-Kamiokande

Understand

Hyper-Kamiokande, the next generation large water Cherenkov detector in Japan, is planning to use approximately 80,000 20-inch photomultiplier tubes (PMTs).

• They are one of the major cost factors of the experiment.
• We propose a novel enhanced photon trap design based on a smaller and more economical PMT in combination with wavelength shifters, dichroic mirrors, and broadband mirrors.
• GEANT4 is utilized to obtain photon collection efficiencies and timing resolution of the photon traps.