COMMISSIONING OF THE FAST ORBIT FEEDBACK AT SLS

T. Schilcher, M. Böge, B. Keil, V. Schlott, Paul Scherrer Institute, Villigen, Switzerland

Abstract:

At the SLS a Fast Orbit Feedback (FOFB) has been designed to stabilize the closed orbit to the 1 $\mu$m level up to frequencies of 100 Hz. The feedback is integrated into the digital BPM system [1] by means of 12 dedicated digital signal processors (DSP) and a fiber optic network. Sub-matrices of the ``inverted'' corrector/BPM response matrix are distributed to the BPM stations and corrections are performed in parallel. First promising commissioning results of the FOFB running at 4 kHz orbit sampling rate are presented. It is demonstrated that the chosen FOFB concept is appropriate and has the potential to reach or even exceed the design goals.