Performance of the ramping power supplies for the APS booster synchrotron

The Advanced Photon Source (APS) booster ramp cycle is completed within 250 ms and repeated at 2 Hz. Separate phase controlled power supplies deliver current to each of the dipole, quadrupole, and sextupole magnet families. Tracking requirements are particularly challenging because of the fast (non-resonant) ramp. In order to meet the requirements, both conventional regulation and cycle-to-cycle adaptation are used. The power supply system and its performance are described.