The CMS Electromagnetic Calorimeter Data Acquisition System at the 2006 Test Beam.

Abstract

The Electromagnetic Calorimeter of the CMS experiment at the CERN LHC is an homogeneous calorimeter made of about 80000 Lead Tungstate crystals. From June to November 2006, eleven barrel Supermodules (1700 crystals each) were exposed to beam at CERN SPS, both in stand-alone and in association with portions of the Hadron Calorimeter. We present the description of the system used to configure and readout the calorimeter during this period. The full set of final readout electronics boards was employed, together with the pre-series version of the data acquisition software. During this testbeam, the hardware and software concepts for the final system were validated and the successfull operation of all the ten supermodules was ensured.

The Run Control and Monitoring System of the CMS Experiment.

“…Petrucci installations are used for the test and validation of the CMS muon chambers [15] and for the tracker system test [16]. Other installations are used for testbeam DAQs, both for tracker, ECAL [17] and muon detectors, and for DAQ global and local tests.…”

Test beam operation of the CMS calorimeter trigger synchronization boards

“…Whenever there is a positive trigger decision, the individual crystal data are then read out by data concentrator cards. The readout system used at the H4 test beam is described in [5].…”