Speaker
Federico Ferri
(INFN Sezione di Milano (INFN))
Description
The electromagnetic calorimeter of the CMS experiment at the new CERN
proton Collider (LHC) consisting in about 75000 scintillating PWO crystals, is
at an advanced stage of construction. The use of cosmic rays allows
intercalibration of all the channels before the final installation in CMS. It also
provides an extensive test, essential for the commissioning of the detector.
The data collected are well described by Monte Carlo simulation based on the
GEANT4 toolkit. The inter-calibration procedure has been proven to reach a
statistical accuracy at the level of 2% within 10 days of data taking and the
comparison with the reference inter-calibration based on electron test-beam
data shows an overall agreement of ∼ 2%. A necessary condition for optimal
performance is a precise channel-to-channel inter-calibration. While the
ultimate calibration of the detector is expected to rely on physics data, the
cosmic muon inter-calibration will provide a reasonable performance already
at the start-up.
Author
Federico Ferri
(INFN Sezione di Milano (INFN))
