Performance and operation of the CMS electromagnetic calorimeter

Published 19 March 2010 Published under licence by IOP Publishing Ltd
, , Citation CMS Collaboration 2010 JINST 5 T03010 DOI 10.1088/1748-0221/5/03/T03010

1748-0221/5/03/T03010

Abstract

The operation and general performance of the CMS electromagnetic calorimeter using cosmic-ray muons are described. These muons were recorded after the closure of the CMS detector in late 2008. The calorimeter is made of lead tungstate crystals and the overall status of the 75 848 channels corresponding to the barrel and endcap detectors is reported. The stability of crucial operational parameters, such as high voltage, temperature and electronic noise, is summarised and the performance of the light monitoring system is presented.

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