Abstract
Bunch-by-bunch feedback (FB) systems are widely employed in charged-particle storage rings to suppress beam instabilities. In the longitudinal plane, the correction applied by a conventional FB system to the beam motion is an energy kick based on the signal originating from a time-of-arrival pick-up device (phase sensing). In this Note, we make a comparison with an alternate approach where the pick-up signal originates from the detection of the energy error. We show that for equal FB gain and input-impulse length the achievable damping rates in the two cases are essentially the same.
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