Water-based Liquid Scintillator R&D at Brookhaven National Laboratory

The water-based liquid scintillator (WbLS) developed recently has many potential applications in neutrino physics and dark matter detection. WbLS, as the primary detector target, allows simple detector design, low maintenance, and adjustable scintillation light yield. In addition, the separation of scintillation and Cherenkov light enable directional reconstruction and enhance low energy efficiency. WbLS doping with elements with high thermal neutron capture cross-section is also an attractive material for constructing an outer detector for direct dark matter search. The data taking of a 1-ton prototype at Brookhaven National Laboratory (BNL) is ongoing and provides high-quality WbLS data. The 30-tonne demonstrator is planned to be built at BNL to test the stability and performance of WbLS further. In this talk, the overview and timeline for the 30 tonnes demonstrator will be presented.