Speaker
Description
A new photosensor module, the multi-PMT (mPMT), has been developed for the Intermediate Water Cherenkov Detector (IWCD) of the Hyper-Kamiokande (Hyper-K) experiment. Each mPMT module consists of 19 three-inch PMTs enclosed within a watertight pressure vessel and integrated with custom readout electronics. Compared to conventional 20-inch PMTs used in Super-Kamiokande and Hyper-K, mPMTs offer significantly improved timing resolution, spatial granularity, and angular sensitivity. A total of 97 mPMTs were deployed and tested in the Water Cherenkov Test Experiment (WCTE), a prototype detector operated at the CERN East Area T9 beamline between October 2024 and June 2025. This presentation will provide a detailed overview of the mPMT design, mechanical assembly, and quality assurance procedures developed for large-scale production. We will present key performance results, including timing, efficiency, and angular response calibrations performed using LEDs embedded within each PMT. We will also share lessons learned from approximately eight months of mPMT operation under beam conditions, offering valuable insights for future mPMT-based detector deployments in Hyper-K and beyond.
| Position | Postdoctoral Fellow |
|---|---|
| Affiliation | TRIUMF: Canada's Particle Accelerator Centre |
| Country | Canada |