Simulations of the Bunch-by-Bunch Feedback Operation with a Broadband RF Cavity as Longitudinal Kick

Multibunch instabilities caused by narrow band impedances existing in the DAΦNE main rings are damped by a bunch-by-bunch feedback system [1]. A longitudinal kicker is necessary to give the energy correction to each bunch. The already proposed stripline kickers [2] have come out to have several HOMs with quite high shunt impedances that further excite the beam, and they contribute a relevant amount to the total broad band impedance [3].