Development of a setup for precision measurement of the time parameters of thin-walled straw tubes for the COMET experiment

Vladimir Kalinnikov a, Elena Velicheva a, Satoshi Mihara b, Basar Sabirov a, Nikolozi Tsverava a

a Joint Institute for Nuclear Research, JINR, Joliot-Curie Str.6, Dubna, Russia
b High Energy Accelerator Research Organization (KEK), 1-1 Oho, Tsukuba, 305-0081, Ibaraki, Japan
Nucl.Instrum.Meth.A 1076 (2025) 170530
4/11/25
https://doi.org/10.1016/j.nima.2025.170530

COMET (Coherent Muon to Electron Transition) is an experiment designed to search for the process of the neutrinoless, coherent transition of a muon to an electron in an aluminum atom, which will be implemented using the proton beam of the J-PARC accelerator complex, Japan. One of the main detectors of the COMET experiment is a straw tracker made of thin-walled drift tubes. A straw tube is a single-channel gas drift tube, the time parameters of which will determine the accuracy of measuring the momentum of a 105 MeV electron in the experiment. To study the time characteristics of thin-walled (12 μm) aluminized straw tubes with a diameter of 5 mm, a precision measurement system was developed and measurements of the time resolution, drift velocity, nonlinearity of the parameters over the cross-section were performed, the R-T dependence for the Ar/CO2 (60/40) pre-mixed gas mixture was obtained. This setup also allows studying the time parameters for other gas mixtures.

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