Performance and upgrade plans for the CMS detector

Performance and upgrade plans for the CMS detector The CMS experiment at the CERN Large Hadron Collider has collected data during 2011 for an integrated luminosity exceeding 5\,fb$^{-1}$ at 7\,TeV centre of mass energy. The detector has performed excellently, with very good data taking efficiency since the very beginning. The operational experience will be described, including the first part of 2012, focusing on some relevant technical aspects. New challenges dictated by the planned luminosity increase are ahead for CMS. A general overview of the upgrade plans to cope with increased luminosity scenarios will be given, including both medium and long term range.