Development of MPPC Cooling System for COMET Trigger Counter

Takahiro Mizuno1,*, Yuki Fujii2, Ryoka Sasaki3, Akinori Sumimura3, Junji Tojo1, and Kazuki Ueno3

1Faculty of Science, Kyushu University, Fukuoka 819-0385, Japan
2Faculty of Natural Sciences, Imperial College London, South Kensington Campus, London, SW7 2AZ, U.K.
3School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
JPS Conf. Proc. 45 Proceedings of the 4th J-PARC Symposium 2024
6/12/26
https://doi.org/10.7566/JPSCP.45.011108

The COMET experiment, which searches for the μ–e conversion process, uses MPPCs in the trigger counter. The MPPCs receive a radiation dose equivalent to 1010 neutrons/cm2 during the experiment, which increases dark noise. This noise can cause fake triggers and degrade timing resolution. In order to suppress the dark noise, the MPPCs need to be cooled. The MPPC cooling system is designed to cool the MPPCs down to approximately −36°C. Several cooling system prototypes were tested to determine the final design for COMET Phase-I.

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