1199958 SzGeCERN 20180607220343.0 DOI 10.1016/j.nima.2009.07.102 oai:cds.cern.ch:1199958 cerncds:FULLTEXT cerncds:CERN:FULLTEXT INIS cerncds:CERN Inspire 866137 CMS-CR-2009-160 eng Musella, Pasquale Lisbon, LIFEP AUTHOR|(CDS)2108443 #BEARD# The ECAL online software in the commissioning of the CMS detector 2010 Geneva CERN 5 Jun 2009 The Electromagnetic Calorimeter (ECAL) of the Compact Muon Solenoid (CMS) detector at the CERN Large Hadron Collider (LHC) is a crystal homogeneous calorimeter made of about 76000 Lead Tungstate crystals. The detector was installed in the CMS experimental cavern in 2007 and 2008 and was commissioned with cosmic rays and with LHC beams in 2008. The trigger and data acquisition system of the CMS ECAL comprises 35000 Front End ASICs and 170 Off Detector VME Boards. The operation of the system, performed by the ECAL online software, requires the configuration of $\mathrm{O(10^7)}$ parameters and the realtime monitoring of $\mathrm{O(10^5)}$ registers. In this paper we discuss the design and architecture of the ECAL online software and its performances in cosmic ray runs and with the first LHC beams. CC-BY-4.0 Preprint Pasquale Musella CERN EDS no affiliation SzGeCERN Detectors and Experimental Techniques CERN ECAL CERN ACQUISITION CERN DETECT-INTEG CERN ELECTRONICS CERN GENERAL CERN SOFTWARE CERN ARTICLE INTNOTE PUBLCMS CERN LHC CMS for the CMS Collaboration 303-305 1-3 Nucl. Instrum. Methods Phys. Res., A 617 2010 http://cds.cern.ch/record/1199958/files/CR2009_160.pdf 5 p n 200933 13 20110328 1136 CER01 20090812 1128651 303-305 labiodola20090524 PUBLIC 002841745CER INTNOTECMSPUBL ConferencePaper ARTICLE