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Bunch-by-bunch feedback control of coupled-bunch instabilities has become a ubiquitous feature of storage rings, light sources and colliders. Specifying the requirements for these systems demands knowledge of the instability sources and the accelerator operating parameter space. System requirements include the necessary loop gain and bandwidth, kick voltage, and the overall noise floor. Based on these specifications one can select the system BPMs, processing algorithms, power amplifiers and kickers and make tradeoffs of system cost against necessary performance. Through the use of analytical and experimental techniques this talk will illustrate practical and intelligent choices in this specification process. The approach involves experimental characterization of the accelerator at low or moderate beam currents. Measurements are used to calibrate a parameterized analytical beam dynamics model which can be then extrapolated to nominal beam currents with confidence. The speaker will present example results from several recent installations, highlighting the measurements, the model predictions, and the achieved system performance.
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