CURRENT STATUS OF A 1.2 GeV STB RING AT TOHOKU UNIVERSITY

A 1.2 GeV Stretcher-Booster Ring (STB ring) has been routinely operated at Laboratory of Nuclear Science (LNS), Tohoku University. The STB ring has functions of a pulse-beam stretcher and a booster-storage ring. In the booster- mode operation, high energy γ-ray beam generated via Bremsstrahlung from internal target wire is utilized for experiments of nuclear physics. The quality of the γ-ray beam has been recently improved by modifying the lattice functions of the ring, and we mainly report the improvement in this issue.