Performance Test Towards the Construction of Cylindrical Trigger Hodoscope in COMET Phase-I

Authors

Ryoka Sasaki¹^,*, Yuki Fujii², Sam Dekkers³, Alex Miles³, Kazuki Ueno¹, Kou Oishi²^,⁵, Yoshi Uchida², Kenya Okabe⁴, Masaaki Higashide⁴, Hajime Nishiguchi⁵, Satoshi Mihara⁵, Thomas Clouvel⁶, and Nicolas Chadeau⁶

Affiliations

¹Osaka University, Toyonaka, Osaka 560-0043, Japan

²Imperial College London, SW7 2BW, United Kingdom

³Monash University, Clayton Campus, 3800, Melbourne, Australia

⁴SOKENDAI, Tsukuba, Ibaraki 305-0801, Japan

⁵High Energy Accelerator Research Organization, Tsukuba, Ibaraki 305-0801, Japan

⁶Université Clermont Auvergne, CNRS/IN2P3, Laboratoire de Physique de Clermont Auvergne, F-63000 Clermont-Ferrand, France

Journal

Published Date

6/12/26

DOI

Abstract

The COMET experiment searches for muon-to-electron conversion at J-PARC. In its Phase-I stage, a trigger signal will be provided by a Cylindrical Trigger Hodoscope (CTH) by taking four-fold coincidence of scintillation photons. A full scale CTH prototype was constructed to study its performance for the first time. We performed a beam test with the prototype at the Paul Scherrer Institut. We took data with various conditions of momentum and CTH position. Time resolution, light yield, detection efficiency, and particle identification power to suppress cosmic ray were evaluated.