APS storage ring commissioning and early operational experience

The Advanced Photon Source (APS) at Argonne National Laboratory (ANL) uses a 100-mA, 7-GeV positron storage ring to produce high brilliance bending magnet and insertion device X-rays for up to 70 X-ray beamlines. It is 1104 meters in circumference and has a beam lifetime designed to exceed 10 hours with 1 nTorr average ring vacuum at 100 mA. The high brilliance required by the synchrotron light users results from the storage ring's natural emittance of 8.2 nm-rad, together with the requirement that the beam be stable to a level which is less than 5% of its rms size. Real-time closed orbit feedback is employed to achieve the required stability and is discussed elsewhere in these proceedings. Installation of storage ring components was completed early this year, and we report here on the first experiences of commissioning and operation with beam.