Abstract
Abstract The Compact Muon Solenoid (CMS) detector is one of the two largest and most powerful particle physics detectors ever built. CMS is installed in P5 at CERN's Large Hadron Collider (LHC) and as of early 2011 has completed nearly a year of operation in which it recorded products of interactions produced in protonproton collisions at a center of mass energy of 7 TeV. The proton-proton run 2010 lasted 7 months and was followed by Pb-Pb ion collisions in November. During the first few months of 2011 the LHC has delivered higher luminosity. The LHC machine is performing extremely well, allowing CMS to record enough data to perform a large number of studies of the Standard Model (SM) of particle physics in this new energy domain for the first time and to search for evidence of new physics in regions of phase space that have never before been entered. The CMS detector components, the operational experience and the performance with colliding beams will be described.
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