Veto Scintillating Detector Design Testing

As a part of the upgrades from PRad I, the new PRad II will have the addition of an extremely low angle Veto Scintillating Detector. This detector will consist of 4 actuating panels of scintillating material.These panels will be able to be brought in to cover extremely low angles for calibration. While the beam is running, the panels will retract and allow for differentiation between e-p and e-e events at these low angles. The ability to separate at these low angles will improve statistics for the proton radius measurement in a region that was previously unable to be separated in PRad I.

Currently, there are two potential designs prepared for this detector. The difference between the two is the thickness of the scintillating panels. The panels can either be 5mm thick or 3mm thick. Obviously the preference would be to use as little material as possible to lower multiple scattering effects, and minimize energy losses in this detector. However, it is currently being checked if the signal from the 3mm panels will be good enough to use during the experiment. See details for this project below.