Author/Authors :
Naumann، نويسنده , , J. and Anton، نويسنده , , Jochen G. and Bock، نويسنده , , A. and Grabmayr، نويسنده , , P. and Helbing، نويسنده , , K. and Kiel، نويسنده , , B. and Menze، نويسنده , , D. and Michel، نويسنده , , T. and Proff، نويسنده , , S. and Sauer، نويسنده , , M. and Schumacher، نويسنده , , M. and Speckner، نويسنده , , T. and Weihofen، نويسنده , , W. and Zeitler، نويسنده , , G.، نويسنده ,
Abstract :
This paper describes the set-up and calibration of the tagging system of the GDH-Experiment at the accelerator facility Elsa 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 5×106 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.
Keywords :
Tagging system , GDH sum rule , High-energy photon beam , Scintillator hodoscope
