Behavior of the planned RF feedback loops under beam loading during a reference SIS100 cycle

It is well known that beamloading effects in acceler- ating cavities can have a serious impact on the beam quality. In order to prevent emittance growth and to keep beam loss low during acceleration, detailed simu- lations are necessary to evaluate the effects on the cavity and its low level RF feedback systems. This situation is aggravated by the fact that in a SIS100 scenario two out of ten buckets have to stay empty. Up to now the closed loop performance of the overall cavity system is still an open topic. Therefore a detailed study has been started.