CMS RPC trigger and detector performance during the 2009 Cosmic Run At Four Tesla (CRAFT09)

During the period July-September 2009 the CERN CMS experiment undertook a long cosmic data taking period, called Cosmic Run At Four Tesla (CRAFT09). Several millions of cosmic muon events were collected to achieve first detector calibration, synchronization and performance study. CMS RPC system was carefully monitored and its performance were evaluated. Dedicated tools in order to manage the workflow of data analysis and algorithms to measure the detector and trigger efficiency were implemented.