Scanner Detector Systems for the MOLLER Experiment

The MOLLER Experiment is a parity-violating electron scattering experiment that will use the polarized electron beam at Jefferson Lab to obtain a very precise measurement of the weak mixing angle at low energy. In addition to the main detector systems measuring the physics asymmetry, there will be many auxiliary detector systems monitoring systematic effects. The two scanner detector systems will consist of remotely-movable Cerenkov detectors. The Upstream Scanner system will scan in two dimensions to verify that the scattered rate distribution at low beam current is similar to the distribution at high beam current. The Downstream Scanner system will allow for a beam-based alignment check of the acceptance-defining collimator. In this talk, I will give an overview of the Upstream and Downstream Scanner systems and present experimental comparisons to Monte Carlo simulations.