Speaker
Description
A new photosensor module, the multi-PMT (mPMT), has been developed for the Intermediate Water Cherenkov Detector (IWCD) in the Hyper-Kamiokande (Hyper-K) experiment. Each module contains 19 three-inch PMTs housed within a watertight pressure vessel and integrated with custom readout electronics. Compared with the conventional 20-inch PMTs used in Super-Kamiokande and Hyper-K, mPMTs offer substantially better timing resolution, finer spatial granularity, and improved angular sensitivity.
In the Water Cherenkov Test Experiment (WCTE), a prototype detector operated at the CERN East Area T9 beamline, 97 mPMTs were deployed and evaluated from October 2024 to June 2025. This talk will describe the mechanical and electrical components involved in mPMT construction, the assembly process, and the quality assurance procedures developed for large-scale production. We will present key performance measurements, including timing, detection efficiency, and angular response calibrations using embedded LED systems within each PMT. Finally, we will share operational experience and lessons learned from approximately eight months of beamline operation, offering guidance for deploying mPMT-based systems in Hyper-K and future detectors.
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