Abstract
A full-scale prototype position detector has been built and tested for the uranium-tetramethylpentane (TMP) calorimeter which is presently being constructed for the UA1 experiment at the CERN proton-antiproton collider. The position detector consists of a sealed stainless steel box containing TMP and three electrode planes, where the middle plane is used for energy measurement, and the other two are highly segmented to enable a precise measurement of the position of electromagnetic showers. The position detector has been operated in electron and muon test beams at CERN. The detector performs well, both as an element of the calorimeter and as a device for measuring shower positions, and yields a spatial resolution of about 1 mm for high energy electron showers.
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