The BETS (baloon-borne electron telescope with scintillating fiber) detector has been developed for high-altitude balloon fights to observe high-energy cosmicelectrons. The detector consists of an imaging calorimeter and a trigger system for particle identification and energy measurement. The calorimeter is composed of scintillating fibers and leads of a total thickness of approx 8 r.1. Two sets of an image-intensifier and CCD camera system are adopted for read-out of 10,080 scintillating fibers. The accelerator tests were carried out to study performance of the detector by the CERNSPS electron and proton beams. It is demonstrated in the flight data that a reliable identification of the electron component has been successfuly achieved up to 100 GeV, and the energy spectrum has been measured.
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