Quality Control of Multi-Pixel Photon Counters for the COMET Experiment

Alex Miles1,*, Yuki Fujii2, Nicolas Chadeau3, Thomas Clouvel3, Thomas Bouillaud4, Ryoka Sasaki5
1Monash University, Wellington Rd, Clayton VIC 3800, Australia
2Imperial College London, Exhibition Rd, South Kensington, London SW7 2AZ, U.K.
3Université Clermont Auvergne, CNRS/IN2P3, Laboratoire de Physique de Clermont Auvergne, F-63000 Clermont-Ferrand, France
4Kyushu University, Fukuoka 819-0395, Japan
5Osaka University, Suita, Osaka 565-0871, Japan
JPS Conf. Proc. 45 Proceedings of the 4th J-PARC Symposium 2024
6/12/26
https://doi.org/10.7566/JPSCP.45.011058

Phase-I of the COMET experiment will soon go into the construction phase, so accurate characterisation of each component is becoming increasingly important. The MPPC Integrated Light Evaluation System (MILES) is designed for the efficient evaluation of each Multi-Pixel Photon Counter (MPPC) used for the Cylindrical Trigger Hodosocope (CTH) in Phase-I. The main properties we investigate are the signal linearity with light intensity, single photoelectron response, gain, breakdown voltage and dark current rate. With only 8 min needed for a set of 3 MPPCs and around 400 required for the CTH, MILES is able to complete the quality control data collection in only 20 h, with a reproducibility uncertainty of 4.9%.

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