Construction of a cosmic-ray telescope with small-scale CMS Drift Tubes Chambers.

A cosmic-ray telescope has been set up in INFN Bologna using two small-scale versions of the CMS detector Drift Tubes Chambers, called "miniDTs". The miniDTs, built at INFN Legnaro with original materials from the CMS construction, are identical to CMS Drift Tubes in cell geometry, high-voltages, gas, and front-end electronics, while custom high- and low-voltage connectors and powering modules were developed. The chambers are read out with prototype triggerless electronics being developed for the Phase2 upgrade of CMS. Signals from scintillator planes coupled to PMTs are also read out as time references for muons crossing the system, enabling detailed analysis of the chamber performance in terms of efficiency and resolution. The miniDT construction and the main features of the telescope setup will be outlined, and performance results obtained from a sample of cosmic-ray data will be presented.