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The Time of Flight (TOF) resolution of one of the LHC ALICE detectors, a prototype of the electromagnetic calorimeter PHOS (PHOton Spectrometer), was measured in beam tests carried out at CERN PS. The prototype of the calorimeter consists of 256 (22×22×180mm3) cells of light-detecting PbWO4 (PWO) monocrystals read out with 5×5mm2 Avalanche Photo Diodes (APDs). Three dedicated front end cards with...
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