• Cherepanov V.P.
  Budker Institute of Nuclear Physics, Novosibirsk, Russia

Video pulse power amplifier for VEPP-4M storage ring vertical betatron oscillations damping system is designed. Low level signal band of the amplifier is 0.5-50MHz, impulse power is 400W. The amplifier is fulfilled in standard "Cherry", width of module is 80mm. In sight the amplifier will find application in betatron frequencies measurement systems of accelerators and storage rings and as preamplifier in RF systems of heavy particles beams accelerators. In the report the amplifier parameters and base elements are described. At present time one of the amplifier prototype is used in beam spin resonant depolarization system on storage ring VEPP-4M. Design documentation for production of small set of the amplifiers is prepared.

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• V.P.Cherepanov, E.N.Dementev, A.S.Medvedko, V.V.Smaluk, D.P.Sukhanov
  Budker Institute of Nuclear Physics, Novosibirsk, Russia

The fast head-tail and coupled-bunch instabilities are the reasons of the increased beam emittance, energy spread and of the operating current limitations and beam loss. For suppression of any excited transverse mode of the beam oscillation the wide-band bunch-by-bunch digital feedback system have been developed and installed on the VEPP-4M storage ring. A description of the system parameters and architectures, of the available diagnostic tools and of the experimental results is given.

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