Abstract
The central detector of the UA2 experiment at CERN includes a cylindrical tracking and electromagnetic preshower detector which employs 1 mm diameter scintillating fibers as the sensitive medium. The device is 2 m long and extends from 38 to 44 cm in its radial dimension. Sixty thousand fibers are arranged in 24 cylindrical layers, the outer six preceded by 1.5 radiation lengths of lead, permitting the localized detection of electromagnetic showers. In this article we describe the fabrication of the fibers, the assembly procedure used in the construction of the detector and the degree of uniformity achieved. Preliminary results on the performance of the detector during the December 1987 CERN Collider run are also presented.
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