Abstract
A barrel detector of 12 thin scintillator slabs viewed by Hybrid Photo Diodes (HPDs) will be employed in the interaction region of the FINUDA experiment as inner trigger detector. This device, designed to work in a 1.1 T uniform magnetic field, will provide a fast first level trigger to discriminate ( K +, K −) pairs from Φ decay from background events, the common stop for drift chambers and straw tubes and the start signal for Time-of-Flight (ToF) measurements. The performances of a module tested with a 90 Sr radiation source, are presented.
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