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Compact Muon Solenoid
LHC, CERN

CMS-CFT-09-023 ; _CERN_ID_
Calibration of the CMS Drift Tube Chambers and Measurement of the Drift Velocity with Cosmic Rays
J. Instrum. 5 (2010) T03016
Abstract: This paper describes the calibration procedure for the drift tubes of the CMS barrel muon system and reports the main results obtained with data collected during a high statistics cosmic ray data-taking period. The main goal of the calibration is to determine, for each drift cell, the minimum time delay for signals relative to the trigger, accounting for the drift velocity within the cell. The accuracy of the calibration procedure is influenced by the random arrival time of cosmic muons. A more refined analysis of the drift velocity was performed during the offline reconstruction phase, which takes into account this feature of cosmic ray events.
CMS Publications
Compact Muon Solenoid
LHC, CERN