Abstract
We have been developing the 50 cm Hybrid Photo-Detector (HPD) for Hyper-Kamiokande, a next generation underground large water Cherenkov detector, to improve the detection capability of the Cherenkov photons compared to Photo-Multiplier Tube used in Super-Kamiokande (SK PMT). A 20 mm diameter size is required for an avalanche diode (AD) to reach a sufficient collection efficiency. By developing segmented and low capacitance ADs, we successfully suppressed a noise accompanied with the large junction capacitance of the AD. Compared with the SK PMT, the HPD has three times better single photo-electron resolution of 10∼15% and twice better timing resolution of 1.5 ns with bias voltage of 570V.
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