Publications

The main goal of this thesis was the development and integration of Monitoring Software for the Drift Tube Track Finder (DTTF), a subsystem of the Level-1 Trigger (L1T) of the Compact Muon Solenoid (CMS) experiment at the Large Hadron Collider (LHC) at CERN (European Organization for Nuclear Research). The DTTF is made of special hardware components, which combine track segment data from four muon stations to complete muon tracks and pass this information on to the next trigger device, the Global Muon Trigger (GMT). Software is needed to configure and monitor this special hardware in the CMS commissioning and data taking phases. This software should enable to visualize incoming and outgoing trigger rates, in order to guarantee correct working conditions and avoid faulty data being processed. The software is implemented in the Trigger Supervisor Framework, which gives the possibility to run the monitoring location-independently over a web application. The software runs on three machines in parallel, coordinated by a central unit, the DTTF Supervisor Cell. In this cell the DTTF hardware can be fully controlled via Commands and Control Panels. The most important monitor items are the input rates of Drift Tube muon stations I to IV and the Cathode Strip Chambers (CSC) in the endcaps, as well as the output rates for two channels of found tracks. In addition, modules to represent the hard- and software status of the entire DTTF and the possibility to forward messages about malfunctions to the Central Trigger Cell were developed. The software was tested, checked for errors and analyzed during data taking with cosmic rays, in so-called Global Runs, in particular during the CRAFT-phase ( Cosmics Run At Four Tesla ) with the CMS magnet switched on.