Gain Studies Using Cosmic Rays

The BONuS12 experiment ran in 2020 at Jefferson Lab in Hall B. BONuS12's central detector was a Radial Time Projection Chamber that was comprised of Gas Electron Multipliers (GEMs). In order to ensure that the GEMs were operating well, gain studies were done with cosmics data. Cosmics data has been taken both before and after the production run. Post-production data was taken at the test stand at Old Dominion University (ODU). This poster talk will focus on the ODU cosmics data, detailing progress and plans.