Test of a small prototype of the COMET cylindrical drift chamber

Authors

C. Wu ^a ^b ¹, T.S. Wong ^a, Y. Kuno ^a ¹, M. Moritsu ^a ^c ^d, Y. Nakazawa ^a ², A. Sato ^a, H. Sakamoto ^a ³, N.H. Tran ^a ⁴, M.L. Wong ^a ⁵, H. Yoshida ^a ¹, T. Yamane ^a, J. Zhang ^e ^f

Affiliations

^a Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
b Department of Physics, Nanjing University, Nanjing 210093, China
c Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization, Tsukuba 305-0801, Japan
d Experimental Physics Division, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
e State Key Laboratory of Particle Detection and Electronics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
f University of Chinese Academy of Sciences, Beijing 100049, China

Journal

Published Date

8/20/21

DOI

Abstract

The performance of a small prototype of a cylindrical drift chamber (CDC) used in the COMET Phase-I experiment was studied by using an electron beam. The prototype chamber was constructed with alternating all-stereo wire configuration and operated with the HeiC₄H₁₀(90/10) gas mixture without a magnetic field. The drift space–time relation, drift velocity, d/d resolution, hit efficiency, and spatial resolution as a function of distance from the wire were investigated. The average spatial resolution of 150 m with the hit efficiency of 99% was obtained at applied voltages higher than 1800 V. We have demonstrated that the design and gas mixture of the prototype match the operation of the COMET CDC.