First Steps towards the Integration of Photon Beam Position Monitor Signals into the SLS Fast Orbit Feedback

So far, photon beam position monitor (PBPM) signals at the SLS are mainly used to verify the performance of the fast orbit feedback (FOFB), which is based on RF BPM position readings. Additionally, a slow high level PBPM feedback compensates systematic effects of the dig-ital BPM electronics. The development of a new PBPM signal processing electronics allows the synchronization of the PBPM signals with the 4 kHz sampling rate of the FOFB. Subsequent integration of the photon beam position data into the FOFB system will be achieved by signal distri-bution through fibre optics links (Rocket I/O) based on the generic VME PMC carrier board (VPC) and on mezzanine receiver modules on the FOFB DSP board. The integration of PBPM signals based on the new electronics concept is explained