Speaker
Description
R&D for the backward-endcap ECal of ePIC
We are conducting R&D for the ePIC electron-endcap electromagnetic calorimeter. It will be composed of bars of scintillating PWO crystals, that we characterized in particular by measuring their temperature-dependent light yield, their optical transmittance and their radiation hardness. The anticipated readout with silicon photomultipliers (SiPMS) is now being investigated. The SiPMs need to have a large dynamic range to detect energies spreading over several orders of magnitude, so we are interested in characterizing SiPMs with a large number of pixels. The measurement is challenging due to their low gain and high dark rate. Tests were performed with LED light to measure their linearity, and determine how they could meet the requirements of ePIC. Measurements are currently on-going to understand the minimal energy that could be detected using this SiPM solution. We will report on recent results of these tests and outline the next steps towards finalizing the readout concept for this detector subsystem.
