Dr Hiroyuki Sekiya (ICRR)
The grand design of Hyper-K water and the detail of the pure water system including the flow in the tank will be presented.
Prof. Mark Vagins (Kavli IPMU)
A water system design which allows the use of dissolved gadolinium sulfate in Hyper-Kamiokande will be discussed, along with the current status of Super-Kamiokande's gadolinium R&D project.
David Jaffe (BNL)
Recent research and development towards Water-based Liquid Scintillator (WbLS) appears to suggest that such materials can be made stable and economical in large quantities. This opens the possibility to detect low energy particles below the Cherenkov threshold that are inaccessible to a water Cerenkov detector. It also enhances the scientific agenda of future large water Cherenkov detectors....