Abstract
The design and first results from the test of a prototype of a preradiator detector are described. Such a detector could be used to enhance the identification of photons and electrons at the Superconducting Super Collider (SSC). The authors' prototype consists of a tungsten radiator followed by silicon strip detectors. The tungsten thickness is changeable, varying from 0 to 3 radiation lengths. Two silicon detectors, oriented in X and Y, consist of 48 strips, each with a length of 48 mm. The pitch is 1 mm. This granularity is required for separating single and multi-photons at the SSC. The readout is achieved by low-noise, low-power custom preamplifier chips mounted directly on the detectors via custom circuit boards. This preradiator was tested in a beam at Brookhaven National Laboratory. The results from the test on spatial distributions and energy resolution, including correction for the energy deposited in the preradiator, are presented.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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