PoS - Proceedings of Science
Volume 364 - European Physical Society Conference on High Energy Physics (EPS-HEP2019) - Detector R&D and Data Handling
Commissioning of the Cylindrical Drift Chamber for the COMET experiment
M. Moritsu,* Y. Kuno, Y. Matsuda, Y. Nakazawa, S. Ohta, H. Sakamoto, A. Sato, M.L. Wong, T. Wong, C. Wu, H. Yoshida, X. Jiang, H.b. Li, Y. Nakatsugawa, J. Zhang
*corresponding author
Full text: Not available
Abstract
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.
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