Present status of accelerator at SAGA Light Source

A 1.4 GeV electron storage ring and a 255 MeV injection linac have been stably operated in FY 2011 at a synchrotron radiation facility SAGA-LS. Six bending magnets and three insertion devices of an APPLE-II, a planar undulators and a hybrid superconducting three pole wiggler have been operated as light sources for user operation. The beam abortion rate in user operation was about 4.8%, which was determined mainly a water leak accident at a circulator of the storage ring RF system. The hybrid superconducting wiggler has been operated stably from official operation start in November, 2010. The spectral range of SAGA-LS was expanded up to about 40 keV by the wiggler. The wiggler abortion rate for the beam line BL7 was attained to be less than 1%. A laser Compton scattering experiment using a CO2 laser has been investigated. Study of concurrent usage of the gamma ray with user operation of synchrotron radiation was examined. A linac trigger system, which synchronizes with the storage ring, has been developed. The design study of the full energy booster for the storage ring is in progress. (author)