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Kondakov, A.A.

Paper Title Page
MOCP09

 Status Of 172 MHz Rf System For VEPP-2000 Collider 

  • V.S.Arbuzov, Yu.A.Biryuchevsky, A.A.Bushuev, E.I.Gorniker, E.K.Kendjebulatov, A.A.Kondakov, I.A.Koop, S.A.Krutikhin, Ya.G.Kruchkov, I.V.Kuptsov, G.Ya.Kurkin, N.V.Mityanina, S.V.Motygin, V.N.Osipov, V.M.Petrov, A.M.Pilan, A.M.Popov, V.P.Prosvetov, E.A.Rotov, I.K.Sedlyarov, Yu.M.Shatunov, A.G.Tribendis, V.N.Volkov, S.V.Volobuev
    Budker Institute of Nuclear Physics, Novosibirsk, Russia

The description of storage ring VEPP-2000 RF system is given. The RF system consists of an RF generator with a tetrode GU-101A in the generator output stage and with output power of 60 kw in CW mode, an accelerating cavity with damping of the high orders modes (HOM) and accelerating voltage of 120 kV and a control system providing tuning of RF cavity and control of accelerating voltage phase and amplitude. Detailed description of operation of automatic frequency tuning system of choke-filter, which prevents a leakage of RF power of the accelerating mode to one (of two) HOM dumper, and a system of automatic frequency tuning of cavity operating mode is given. The results of RF system commissioning are given. Now the RF system is made, assembled and installed to the storage ring.

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MOCP14

 Feedback System For Damping Of Longitudinal Bunch Oscillations in VEPP-4 Collider 

  • V.S.Arbuzov, E.I.Gorniker, E.K.Kenjebulatov, A.A.Kondakov, S.A.Krutikhin, Ya.G.Kruchkov, I.V.Kuptsov, G.Ya.Kurkin, S.V.Motygin, V.N.Osipov, V.M.Petrov, A.M.Pilan, A.M.Popov, E.A.Rotov, I.K.Sedlyarov, A.G.Tribendis, V.N.Volkov
    Budker Institute of Nuclear Physics, Novosibirsk, Russia

In order to luminosity increase in VEPP-4 collider at BINP, it was acceded to increase the current in four-bunch mode (2å-2å+) from 5ìÀ up to 30ìÀ in each bunch. One of the problems on the way to current increase is instability associated with longitudinal bunch oscillations. A feedback system is being developed for bunch oscillations control. The feedback system consists of two identical parts, each works with separate amplifier of 100 W and deals with only one type of particles. Each part contains two channels: one for damping of inphase oscillations, another for damping of antiphase oscillations. Decrement due to the feedback system is about 3000 1/s, that exceeds the decrement due to radiating losses approximately by 180 times.

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