Commissioning of the Cylindrical Drift Chamber for the COMET experiment Article Swipe

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Manabu Moritsu , Y. Kuno , Y. Matsuda , Y. Nakazawa , Saki Ohta , Hideyuki Sakamoto , Akira Sato , Ming Liang Wong , Tuck Seng Wong , Chen Wu , Hisataka Yoshida , Xiaoshan Jiang , Hai-Bo Li , Y. Nakatsugawa , Jie Zhang ·

YOU? · · 2020 · Open Access · · DOI: https://doi.org/10.22323/1.364.0128 · OA: W3158168302

A cylindrical drift chamber (CDC) has been developed for the COMET Phase-I experiment. To search for the muon-to-electron conversion with a sensitivity of $3 \\times 10^{-15}$, the CDC is required to have momentum resolution of 200 keV/$c$ for 100-MeV/$c$ electrons. In order to reduce the multiple scattering, we have selected a chamber gas mixture of 90% helium with 10% isobutane. Construction of the CDC was successfully conducted, and performance evaluation is being carried out. We have confirmed stable operation without a magnetic field thus far based on cosmic-ray tests. In this paper, the motivation, design, construction, and commissioning status of the CDC are presented.