• D.Brekhov, V.Leonov, V.Korchuganov, M.Kovalchuk, Yu.Krylov, V.Moiseev, N.Moseiko, D.Odintsov, V.Ushkov, A.Valentinov, Yu. Yupinov
  RRC Kurchatov Institute, Moscow, Russia

An electron-positron collider VEPP-4M is under operation now at BINP. The main goal of the present run is the precise measurement of mass of y -family resonances and t -lepton with the help of resonant depolarization technique. The status and recent results of the experiment are reviewed.

• G.V.Serdobintsev, O.V.Anchugov, K.N.Chernov, I.N.Churkin, A.V.Filiptchenko, A.S.Medvedko, G.N.Ostreiko, S.I.Ruvinsky, S.V.Sinjatkin, A.G.Steshov, S.V.Tararyshkin, V.A.Ushakov, V.D.Yudin
  Budker Institute of Nuclear Physics, Novosibirsk, Russia

• I.Yu.Boiko, N.N.Grachev, V.P.Khramtsov, N.V.Spinko
  Lukin State Research Institute for Problems in Physics, Zelenograd, Russia

• A.M.Dolgov, O.E.Kildisheva
  RIPR, St. Peterburg, Russia

• V.N.Korchuganov, Yu.V.Krylov, D.G.Odintsov, A.G.Valentinov, Yu.L.Yupinov
  Kurchatov Institute, Moscow, Russia

TNK facility (F.V. Lukin Institute, Zelenograd) was designed and manufactured at Budker INP. It includes 80 MeV electron linear accelerator-injector and two electron storage rings: the main ring for energy of 2.5 GeV and booster ring for energy of 450 MeV. The paper presents the functional layout of the linear accelerator. The disk-and-washer 2.8 GHz accelerating structure is described. Results of the accelerator startup is presented. In December 2005, accelerated electron current of ~50 mA with energy of ~50-60 MeV was obtained; the beam was captured into the booster ring.

194

• B.Gudkov, A.Filipchenko, V.Kozak, E.Kuper, G.Kurkin, A.Medvedko, G.Serdobintsev, S.Tararyshkin, V.Ushakov,
  Budker Institute of Nuclear Physics, Novosibirsk, Russia

• V.Korchuganov, Yu.Krylov, A.Valentinov, Yu.Yupinov
  KCSR RSC Kurchatov Institute Moscow, Russia

• N.Spinko
  LSRIPP, Zelenograd, Russia

Control system of Zelenograd Synchrotron Radiation facility, designed at the end 80-th last century, is in commission now. Old system was CAMAC based mainly. More advanced variant will consist in replacement of CAMAC modules with the embedded controllers. The report describes new hardware and software solutions.

228

MODP34

• A.Artemiev, V.Korchuganov, V.Rezvov, V.Moiceev, V.Novikov, A.Valentinov, Yu.Yupinov, A. Zabelin
  RRC Kurchatov Institute, Moscow

For synchrotron radiation (SR) sources - the dedicated electron (positron) storage rings - a high brightness of a photon beam represents the most interest. In turn the brightness of SR depends oppositely on the transverse phase volumes (emittances) of an electron beam as radiation source. For the given optical structure a horizontal emittance of electron beam is determined, mainly, by quantum fluctuations of SR, whilst vertical emittance is defined, basically, by a level of a coupling (width of a resonance) between vertical and horizontal betatron oscillation of particles. It is reported in the work that the control of the betatron coupling factor in SIBERIA - 2 storage ring in Kurchatov institute reaches a level of 0.001 with the use of skew-quadrupoles. Closed orbit distortions control at a micron level, an arrangement and the forces of skew - quadrupoles also are the objects of research. Experimental dependence of the electron bunch transverse sizes on the coupling factor is presented.

• V.Korchuganov, A.Valentinov
  RRC Kurchatov Institute, Moscow

• N.Mezentsev
  Budker Institute of Nuclear Physics, Novosibirsk, Russia

At present the dedicated synchrotron radiation source Siberia-2 in Kurchatov Institute operates with electron energy 2.5 GeV and current up to 200 mA. In order to expand spectral range of SR and to increase brightness an installation of 7.5 T 19-pole superconducting wiggler is planned at the end of 2006. Now the wiggler is under fabrication in BINP, Novosibirsk. Such high level of a magnetic field in the wiggler will have a great influence on electron beam parameters of Siberia-2. Changes of these parameters (betatron tunes, horizontal emittance of the electron beam, momentum compaction, energy spread etc.) are discussed in the report. Different methods of compensation (global and local) of betatron functions distortion are presented. Much attention is paid to dynamic aperture calculations using analytical approximation of magnetic field behavior in transverse horizontal direction.

395

• A.Anoshin, E.Fomin, V.Korchuganov, M.Kovalchuk, Yu.Krylov, V.Kvardakov, S.Tomin, A.Valentinov
  RRC Kurchatov Institute, Moscow

  A project of the new 2.5 GeV booster synchrotron to provide more effective injection of electron beam into Siberia-2, top-up injection, and for enhancement of light source performance, is developing in KCSR [1]. Existing 450 MeV storage ring Siberia-1 will be replaced by new synchrotron. The beam will be injected into the synchrotron at 80 MeV energy from the linear accelerator existed now. Top-up injection into Siberia-2 will permit to avoid the collective instabilities especially important during an injection, when insertion devices are using. In this report, the synchrotron parameters are presented, the basic systems are briefly described.

270