Abstract
Abstract This paper describes the set-up and calibration of the tagging system of the GDH-Experiment at the accelerator facility E lsa in Bonn. The system consists of a C-type dipole magnet and a hodoscope of 65 scintillation counters which are operated pairwise in coincidence to form 64 tagging channels. Photons can be tagged in a range of 68–97% of the primary electron energy E0. The energy resolution ranges from 0.2% to 0.6% of E0. The time resolution is better than 165 ps . The system was operated at rates up to 5×10 6 photons/s in the full tagged energy range. The energy dependence of the photon definition probability was determined using several different methods and was found to agree well with calculations.
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