NewSUBARU STORAGE RING : OPERATIONAL PROGRESS IN THESE THREE YEARS

The NewSUBARU has been in a phase of rapid development since 2001. We report some developments and improvements of storage ring performance at NewSUBARU in these three years. The vacuum system was upgraded and the averaged vacuum pressure for the same out-gassing was reduced. New operational parameters of an RF system enabled the accumulation of the beam to 500mA. Improvement of a water-cooling system of the facility contributed to the stability of the beam orbit. The timing synchronization between the injector linac and the storage ring made a beam injection more stable. By careful magnetic field adjustments, the 11 m long undulator emitted light with a designed spectral line width. At the present the ring is operated either at 1.0 GeV top-up mode, during which the stored beam current is typically kept at 250 +0.3mA, or at accelerated 1.5 GeV mode, during which the beam current decays from about 300 mA to about 100 mA.