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Hyper-Kamiokande Design Report Released

The Hyper-Kamiokande proto-collaboration has completed a design report which describes an improved detector design and its expected sensitivity. The report is now publically available online:

“Hyper-Kamiokande Design Report”, KEK Preprint 2016-21 ICRR-Report-701-2016-1

Hyper-Kamiokande researchers have successfully developed a new 50-cm photodetector with better timing resolution and twice the sensitivity to photons than sensors used in the Super-Kamiokande experiment. This achievement enables the Hyper-Kamiokande water tanks to be smaller, thereby reducing construction costs, without sacrificing any of its physics program.

After reoptimization of the detector Hyper-Kamiokande will have two cylindrical tanks, each 74m in diameter and 60m in height, which will be deployed in stages. Each tank will contain 260 kilotons of water, with a sensitive region equivalent to 190 kilotons; an order of magnitude larger than that of Super-Kamiokande. The inner region of the tanks will be instrumented with 40,000 50-cm photodetectors and provide 40% photocathode coverage. The outer region of each tank will be instrumented with 6,700 smaller photodetectors.

With superior photon sensitivity and a larger detector mass than Super-Kamiokande, Hyper-Kamiokande will have dramatically improved sensitivity to neutrinos and proton decay. Using this detector, scientists will press forward to unravel the secrets of particle unification and the history of the evolution of the universe.

New design of the HK detector