M.C. Fouz

Construction and test of the final CMS Barrel Drift Tube Muon Chamber prototype

A prototype of the CMS Barrel Muon Detector incorporating all the features of the final chambers was built using the mass production assembly procedures and tools. The performance of this prototype was studied in a muon test beam at CERN and the results obtained are presented in this paper.

Study of magnetic field effects in drift tubes for the barrel muon chambers of the CMS detector at the LHC

Abstract The drift chambers in the barrel region of the CMS detector are exposed to magnetic stray fields. To study the performance of the muon reconstruction and the drift time-based muon trigger, prototypes were tested under the expected magnetic field conditions at the H2 test facility at CERN. The results indicate that the overall chamber performance will not be affected. Only the bunch crossing identification capability in the small region near η =1.1, corresponding to the border of the solid angle region covered by the barrel, will be weakened.

Test beam of a quartz-fibre calorimeter prototype with a passive front section

Abstract We present test-beam data analysis of a quartzfibre calorimeter prototype composed of a single active section with a passive absorber in front of it. The partial suppression of the electromagnetic showers leads to the equalization of the response to electrons and pions for a given depth of this passive section. Results are compared with the Monte-Carlo expectations.

The CMS Muon detectors

The compact muon solenoid (CMS) is a multipurpose detector at the large hadron collider (LHC) at CERN. One of the main goals of the CMS design is to ensure efficient and accurate identification and reconstruction of muons. The CMS muon spectrometer is based on three kinds of gaseous detectors placed inside the iron return yoke of a 4 Tesla superconducting solenoid: Drift Tube Chambers (DT), Cathode Strip Chambers (CSC) and the Resistive Plate Chambers (RPC). The detector is currently being assembled and commissioned with cosmics to be ready to take data in 2008. At the end of 2006 a fraction of the whole CMS including several sectors of the muon system were tested together with the magnet at the nominal field. A description of the main features of the system, with more emphasis on the DT detectors will be presented.