The Daya Bay Experiment: Overview and Timeline

The apparent small size of the neutrino mixing angle $\theta_{13}$ has important implications. The Daya Bay neutrino oscillation experiment has the greatest sensitivity to $\sin^2 2\theta_{13}$ of all experiments currently under construction. Our goal is to either determine the size of this mixing angle, or to establish a limit of $\sin^2 2\theta_{13}<0.01$. Essential aspects include an extremely high power reactor facility, four pairs of ``identical'' detectors to monitor flux near and far from the the reactor cores, strong control of backgrounds, and an aggressive and redundant calibration system. We will describe the main components of the experiment, and present an up-to-date timeline for construction, data taking, and completion.