Abstract
At the Electron Stretcher Facility ELSA of Bonn University, an upgrade of the maximum stored beam current from 20 mA to 200 mA is planned. The storage ring operates applying a fast energy ramp of 6 GeV/s from 1.2 GeV to 3.5 GeV and afterwards a slow beam extraction over a few seconds to the hadron physics experiments. The intended upgrade is mainly limited by the excitation of multibunch instabilities. As a countermeasure, we successfully commissioned state-of-the-art bunch by bunch feedback systems in the longitudinal and the two transverse dimensions. To achieve the maximum feedback gain, the beam phase with respect to the reference signal and the synchrotron frequency has to stay constant. A high performance low level RF system has been commissioned which is able to stabilize voltage and phase of the RF station while in addition taking care of resonator resonance tuning using a fast FPGA based fully digital approach.
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