Performance of the Advanced Photon Source

The Advanced Photon Source (APS) positron storage ring is a 100-mA, 7-GeV, third-generation X-ray synchrotron radiation source which began operation in March 1995. Since that time, significant progress on beamline construction and commissioning has taken place, with many of the X-ray user beamlines in operation. Operational design goals which have been met or exceeded include <8.2-nm-rad emittance, >10-hour lifetime, >90% availability, >100-mA average current, >5-mA single-bunch current, <10% uncorrected coupling, 8-mm full vertical apertures for insertion devices, and ultra-stable orbit (<4.5 /spl mu/m RMS vertically, 17 /spl mu/m horizontally). Progress beyond these design goals and a report on development plans, including top-up operation (injection with X-ray beamline shutters open), are presented.