Status of compact SR ring ''HiSOR''

''HiSOR'' is a compact synchrotron radiation (SR) source of Hiroshima Synchrotron Radiation Center, Hiroshima University, established in 1996. The ring has two 180deg bending magnets which generate 2.7 T magnetic field at room temperature. The 700-MeV electron beam circulates the ring circumference 22 m. This racetrack-type ring has two undulators, linear and helical, in each the straight section. HiSOR is a VUV-ring with 1.4 nm critical wavelength. It started the operation at 100 mA stored current in the beginning. From the year 2000, the current increased to 200 mA. We had done two major modifications last year, one upgrading the control system, and the other replacing the RF cavity newly designed to suppress harmful HOM's. In result, HiSOR has been in operation with 350 mA, which satisfied the original specification 300 mA. A Randau cavity was installed simultaneously to reserve tuning flexibility. (author)