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DIRC, the Internally Reflecting Ring Imaging Cherenkov Detector for BABAR


The \dirc\ is a new type of \cer\ imaging device that will be used for the first time in the \babar\ detector at the asymmetric B-factory, {\sc Pep-II}. It is based on total internal reflection and uses long, rectangular bars made from synthetic fused silica as \cer\ radiator and light guide. The principles of the {\dirc} ring imaging \cer\ technique are explained and results from the prototype program are presented. Its choice for the {\babar} detector particle identification system is motivated, followed by a discussion of the quartz radiator properties and the detector design.

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