A Scintillating Fiber Detector For Electron And Photon Identification At High Luminosity Colliders

We report on the construction and first operating experience of a novel detector designed to measure with high accuracy the spatial position of charged particle trajectories and of electromagnetic showers from electrons or photons. This position detector was constructed of two layers of 2 mm thick scintillating fibers with a 15-degrees angle between layers. The photon readout used a newly developed multianode photomultiplier. The device was inserted in a prototype electromagnetic calorimeter for the CDF collaboration and studied at a Fermilab test beam facility. The position detector yielded a spatial resolution for electromagnetic showers of 400 mum for 100 GeV electrons.