FAST ORBIT FEEDBACK SYSTEM UPGRADE IN THE TLS

Orbit feedback system of the 1.5 GeV Taiwan Light Source (TLS) has been deployed for a decade. The loop bandwidth was limited by existing hardware. The system cannot remove orbit excursion caused by the perturbation due to fast operation of insertion devices. To improve orbit feedback performance, corrector power supply and BPM system are undergoing upgraded. New digital BPM electronics will enhance functionality of the BPM system as well. It is expected that the upgrade will significantly improve performance of the orbit stability. New fast orbit feedback system is designed to achieve a submicron stability of the electron beam working at a bandwidth of at least 60 Hz.