The 1.2 GeV photon tagging system at LNS-Tohoku

A tagged photon beam line has been constructed in the Stretcher-Booster ring (STB ring) at Tohoku University. The quasi-monochromatic photon beam is produced by the internal photon tagging system which consists of a solid fiber radiator and the compact tagging counter installed in a bending magnet of the STB ring. The energy range of the tagged photon is from 0.8 to 1.1GeV with the electron energy of 1.2GeV. The performance of the tagging system has been investigated. The system provides good quality of γ-rays for the nuclear and hadron physics experiments.