The construction and performance of the barrel pre-series module 0 of the future ATLAS electromagnetic calorimeter at the LHC is described. The signal reconstruction and performance of ATLAS-like electronics has been studied. The signal to noise ratio for muons has been found to be 7.11 +/- 0.07. An energy resolution of better than 9.5% GeV1/2 / rootE (sampling term) has been obtained with electron beams of up to 245 GeV. The uniformity of the response to electrons in an area of Deltaeta x Deltaphi = 1.2 x 0.075 has been measured to be better than 0.8%. (C) 2003 Elsevier Science B.V. All rights reserved. [References: 39]
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