Seminer Oturumu - "First LHC Beam and Cosmic Muons in CMS" -- Dr. Efe Yazgan

Wednesday 15 Jul 2009, 18:30 → 20:30 Europe/Zurich

6/2-004 (CERN)

Summary: The Compact Muon Solenoid (CMS) at the LHC has taken a lot of useful data in 2008. In this seminar, I will present a brief overview of the first data taken with the CMS both from the first LHC circulating beams on September 10, 2008 and the following days, and also the cosmic muon data from May 2008 to November 2008 with more emphasis on the results from the hadron calorimeter and the tracker. With these data, we were able to align the individual components of subdetectors, validate correlations between subdetectors, synchronize the timing of the sub parts of each detector and also timing of subdetectors with respect to each other. Moreover, these data helped us understand and improve the triggers, sources of noise, the effects of the CMS magnetic field of 3.8 T, test the full chain of data flow, and the monte carlo simulations. The cosmic muon data also provided some simple physical measurements showing that CMS with its millions of different subcomponents works without any major problems and it is ready for the collions in late 2009.