WATCHMAN: Reactor Monitoring and Neutrino Physics with a Gadolinium Doped Water Detector*

WATCHMAN (WATer CHerenkov Monitoring of AntiNeutrinos) is a new US based experiment that will exploit the low energy antineutrino signal from reactors, supernova and decay-at-rest~antineutrino~beams to pursue a broad physics program. WATCHMAN aims to be the first detector in the world to detect low energy~antineutrinos in water, by~adding~a gadolinium~dopant that increases the efficiency for the final-state neutron arising from the antineutrino interactions on protons in the~water.~WATCHMAN will also serve as the world's first demonstration detector of remote reactor monitoring for nonproliferation applications, using a scalable water-based technology. In this talk,~I~will provide~an overview of the physics potential of WATCHMAN, and explain the overlap of its nonproliferation and fundamental science goals.