The PMT testing system for the Daya Bay Experiment

The Daya Bay Experiment is a neutrino-oscillation experiment designed to measure the mixing angle $\theta_{13}$. The goal of this experiment is a measurement of $\sin^22\theta_{13}$ to a precision of $0.01$ or better. There are 2304 $8''$ Photomultiplier tubes (PMT) for detecting the inverse-beta decay signals from the antineutrinos and for tagging the cosmic muon events. To insure that the PMTs satisfy the requirements of the experiment, a comprehensive PMT testing system has been designed and developed in UCLA. The design considerations, implementation and performance of the system will be discussed.