THE CMS ECAL DETECTOR CONTROL SYSTEM

The Compact Muon Solenoid (CMS) is one of the general purpose particle detectors at the Large Hadron Collider (LHC) at CERN. The challenging constraints on the design of one of its sub-detectors, the Electromagnetic Calorimeter (ECAL), imposed the development of a complex Detector Control System (DCS). In this paper the evolution of the CMS ECAL DCS during the period of commissioning and cosmic running will be presented. The acquired experience and feedback from operators were used to trigger several upgrades of the system’s software in order to achieve a very robust, flexible and stable control system. A short description of the new features of all CMS ECAL DCS subsystems, including the relevant associated hardware, and their individual experiences will be discussed as well.