Author :
Chen, C. ; Chen, Y.B. ; Dong, M.Y. ; Gong, Z.Y. ; Huang, J. ; Jin, Y. ; Li, X. ; Liu, J.B. ; Liu, R.G. ; Ma, X.Y. ; Qin, Z.H. ; Shen, H.T. ; Tang, X. ; Wang, L. ; Wang, X.G. ; Wang, X.H. ; Wu, L.H. ; Wu, Z. ; Xu, M.H. ; Zhang, G.F. ; Zhang, J. ; Zhu, M.X.
Abstract :
To meet with requirements of BESIII experiment, the main tracking device is a cylindrical drift chamber with small-cell geometry, using a helium-based gas and operating in a IT magnetic field. A cosmic ray test without magnetic field has been carried out. Preliminary results show that the rms of the residual distribution is 168 mum after the pre-alignment and the calibration of T0 and time-to-distance relation.
Keywords :
cosmic ray apparatus; drift chambers; position sensitive particle detectors; BESIII; IT magnetic field; calibration; cosmic ray test; cylindrical drift chamber; helium-based gas; small-cell geometry; time-to-distance relation; tracking device; Aluminum; Detectors; Geometry; Helium; Magnetic field measurement; Magnetic fields; Skin; Spatial resolution; Testing; Wires; BESIII; cosmic ray test; drift chamber;
