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.
Scintillating Panel Thickness Testing
In order to check the responses of the two scintillator thicknesses there will modules with one of each thickness constructed at the ESB under the HyCal ePAS and then tested in Youri Sharabian's black box in his lab. The simultaneous testing will allow for direct comparisons to be made. Currently, Aruni, Buddhiman, and Erik were provided with scrap scintillating material to practice gluing the larger surfaces without bubbles or any other issues. This also allowed us to check the transparency of the UV-activated glue we intend to use for the test and it seems to be good enough for the test especially since any effects could be expected to be equal in each module. The test pieces glued were given approval on December 3rd, 2024 and we will start constructing the test modules December 4th, 2024. Final Testing results will be added to this page, but daily updates can will e found on the PRad electronic logbook.
Contributors
- Aruni Nadeeshani (Mississippi State University)
- Buddhiman Tamang (Mississippi State University)
- Erik Wrightson (Mississippi State University)
- Youri Sharabian (JLab)
