The ATLAS Liquid Argon Forward Calorimeter : Electrode Uniformity

The mechanical precision of the electrode gaps contributes to the uniformity of response of a liquid argon calorimeter. The electrode capacitance is a sensitive measure of the gap. The capacitance of every electrode in every ATLAS Forward Calorimeter module has been measured giving an rms deviation ranging from 0.8% to 1.7% depending on the module. In concert with the measurements, we have also calculated the capacitance using measurements of the electrode dimensions. The calculated and measured electrode capacitances show good agreement.