Seiko Hirota (Kyoto University)
A hybrid photo-detector (HPD) is being developed for the Hyper-Kamiokande experiment, a next-generation underground water Cherenkov detector designed to study a wide range of topics in physics and astronomy. To establish the feasibility of HPDs for Hyper-Kamiokande, we plan to study their long-term stability and determine their neutrino detection performance. The HPD is a hybridization of a photomultiplier tube and an avalanche diode (AD), in which photoelectrons are amplified in 2 steps: bombardment from the photocatode to the AD surface under high voltage (~8kV) and from the internal AD avalanche. For this reason , the HPD is expected to achieve higher single photon sensitivity and better timing resolution at a lower mass production cost than the conventional PMTs used in the baseline design of Hyper-Kamiokande. Implementation of HPDs in Hyper-Kamiokande could therefore improve its physics sensitivity. As part of our R&D we will evaluate the performance of a water Cherenkov detector using small size, 8-inch HPDs in 200-ton water tank before developing a 20-inch HPD for Hyper-Kamiokande. As a preparation for validation studies in 200-ton tank. The basic performance of sn 8-inch HPD was measured such as single photon sensitivity, timing resolution, uniformity of response, thermal and magnetic dependence and so on. Also we operated it in small water tank to guarantee safe and stable operation. These results and status will be presented.
|quote your primary experiment||HyperKamiokande HPD neutrino|
Akihiro Minamino (Kyoto University) Atsuko Ichikawa (Kyoto university) HIroaki Aihara (University of Tokyo) Hiroyuki Sekiya (ICRR) Keiji Tateishi (Kyoto University) Kunxian Huang (Kyoto University) Makoto Miura (ICRR) Masashi Yokoyama (University of Tokyo) Masato Shiozawa (ICRR) Masato Suzuki (Hamamatsu Photonics K.K.) Masayuki Nakahata (ICRR) Motoyasu Ikeda (Kyoto University) Shoei Nakayama (ICRR) Takayuki Ohmura (Hamamatsu Photonics K.K.) Tsuyoshi Nakaya (Kyoto University) Vagins Mark (Kavli IPMU) Yoichiro Suzuki (Institute for Cosmic Ray Research, Univ. of Tokyo) Yoshihiko Kawai (Hamamatsu Photonics K.K.) Yoshinari Hayato (University of Tokyo)