Beam-performance improvement of the SPring-8 storage ring

The SPring-8 storage ring has improved its reliability and beam performance. At the beginning of year 2001, a project of beam orbit stabilization started aiming for the stability of sub-micron. By two years´ activities, we have taken a remarkable progress on improvement of the orbit stability of the SPring-8 storage ring. Recently, optics of the ring was changed from the Double Bend Achromat type to new one with finite dispersion at the straight section for insertion devices. The horizontal emittance of 3 nm.rad was obtained which is close to the theoretical value. To increase time-averaged brilliance in several bunch operation, we have prepared a top-up operation in user time from September 2003. In this paper, the operational status and recent beam performance of the SPring-8 storage ring are presented.