STATE OF THE SLS MULTI BUNCH FEEDBACKS

In order to control coupled bunch oscillations in the SLS storage ring, feedback systems for all three planes were foreseen, which are realized as fully digital bunch by bunch systems. With the development of dedicated ADC and DAC boards, the feedbacks could be commissioned. Important parts of the computations for the transverse planes were implemented into the FPGA, making the DSPs originally planned to be used obsolete and allowing for an extremely low latency time of 300 ns. The systems give a larger freedom of choice for the beam optics and also lead to a better closure of the injection bump during top up mode. At present, systems for all planes have been commissioned and are in routine service.