Orbit feedback system of the Taiwan Photon Source (TPS) had been delivered since 2014. As long as more and more insertion devices installed, there are various wide-band disturbance produced. To further improve orbit stability, the fast orbit feedback (FOFB) system upgrade plan had been proposed in 2019. The upgrade plan includes both power supply controller revise and feedback computation rate increase from 10 kHz to 30 kHz. After upgrade, TPS fast orbit feedback bandwidth could be expanded from 250 Hz to 400 Hz in the vertical plane and from 200 Hz to 250 Hz in the horizontal plane. The integrated orbit power spectrum density could be effectively decreased around 20%.

Orbit feedback system (OFB) of the Taiwan Light Source (TLS) had been deployed two decade ago and upgraded to improve performance several times. The loop bandwidth was limited by existed hardware. The system cannot remove perturbation form fast source. Therefore, to improve orbit feedback performance, the system have been upgraded in 2008 [1]. It included the BPM electronics upgraded from analogy type BPM to digital BPM and the corrector power supply was also replaced by high performance switching type power supply with wide bandwidth in the same time. Later after Taiwan Photon Source (TPS) commissioning in 2015, to share resources between TLS and TPS control system, it has been decided that TLS’s control system would be migrated gradually to the EPICS (Experimental Physics and Industrial Control System) control system which has been adopted by TPS [2][3]. Orbit feedback system is one of the rejuvenated subsystem with EPICS support. Besides, the feedback computation unit is also upgraded to FPGA and increase calculating cycle from 2.5 kHz to 10 kHz. The integration of BPM, power supply control and fast orbit feedback will be summarized in this report.

Bunch-by-bunch systems are developed at the Taiwan Light source and the Taiwan Photon source to monitor the transverse position and filling pattern. This system consists four channels with 500 MHz sampling rate which synchronizes with the radio frequency of the accelerator. This system is used to diagnose the injection transition due to the kick mismatch and beam oscillation coming from the damped betatron oscillation and wake field.