Performance of the SLD Warm Iron Calorimeter Pre-Prototype

The performance of a pre-prototype of the SLD Warm Iron Calorimeter (WIC) build with proportional tube cathode pad readout has been studied. The calorimeter was found to have an average resolution of 36.7 ± 0.2% for muons at 2.0, 5.0 and 10.5 GeV and 81 ± 2%/√E for pion showers at 5.0 and 10.5 GeV. The mean energy found for the pion showers was consistent with a linear dependance on energy within these standard deviations.