Abstract
Transverse head-tail instability is a severe limitationof a single-bunch beam current in circular accelerators.Applicability and efficiency of feedbacks for suppression of theinstability is analyzed. Both chromatic and nonlinear effects havebeen taken into account to understand the processes of excitationand damping of the instability. Analytical estimations arecompared with the results of experiments and numericalsimulations. A feedback system has been developed, installed andcommissioned at the VEPP-4M electron-positron collider. Anoriginal scheme of the kicker powering has been developed toprovide the necessary performance with minimal expenses. Real-timedigital data processing performed by a code running in an FPGAmodule provides high efficiency and flexibility of the system.During the system commissioning, a more than threefold increase ofintensity of the VEPP-4M single-bunch beam has beenachieved.
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