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Photon background in DIRC fused silica bars

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3 Author(s)
A. Yarritu ; Linear Accel. Center, Stanford Univ., CA, USA ; S. Spanier ; J. Va'vra

The detector of internally reflected Cherenkov (DIRC) radiation is the ring imaging Cherenkov detector of the BABAR detector at the Pep-II ring of SLAC. The Cherenkov radiators consist of 4.9-m-long rectangular fused silica bars each glued together from four equal pieces. The photon detector is a water tank equipped with an array of 10752 conventional photomultipliers. The current study attempts to identify sources of photonic background generated in the DIRC bars. A conclusion of this work is that there are two major sources: one such component consists of photons created by the delta-ray electrons in the fused silica. The second component comes from the reflections of photons from the EPOTEK-301-2 glue-fused silica interface while they are traveling in the bars. The reflection occurs because of a slight mismatch of the refractive indices.

Published in:

IEEE Transactions on Nuclear Science  (Volume:49 ,  Issue: 4 )