STATUS OF THE PHOTON FACTORY

The present status of two synchrotron light sources, the PF and the PF-AR storage rings at KEK, is presented. An upgrade project of the PF storage ring was successfully completed in 2005. Through this upgrade, four shortstraight sections were newly created, and ten existing straight sections were extended. Two short-gap undulators were then installed in the new sections, and were commissioned. Further improvements, including a top-up operation, are in progress. The other PF-AR is a unique single-bunch hard X-ray source. During 2005-2006, two in-vacuum undulators were successfully commissioned.