• V. Volkov, E. Kenzhbulatov, S.A. Krutikhin, G.Y. Kurkin, V.M. Petrov, E. Rotov, N. Vinokurov
  BINP SB RAS, Novosibirsk

The projected electron RF gun of Novosibirsk Microtron-Recuperator injector employs an industrial thermionic cathode grid assembly with 0.08 mm gap that usually used in metal-ceramic RF tubes. Three-dimensional (3D)computer simulations have been performed that use the mesh refinement capability of the both Microwave Studio and 2D SAM codes to examine the full region of the real cathode grid assembly in static fields in order to illustrate the beam quality that can result from such a gridded structure. These simulations have been found to reproduce the beam current behaviors versus of applied potentials that are observed experimentally. Based on it ASTRA RF beam simulations also predict a complicated time-dependent response to the waveform applied to the grid during the current turn-on, calculation of the dissipated power by electrons at the grid, and particle tracking downstream of the grid into RF gun cavity and farther on. These simulations may be representative in other sources, such as some L-band RF injectors for industrial applications.

• P.A. Piminov, V.E. Blinov, A.V. Bogomyagkov, S.E. Karnaev, G.V. Karpov, V.A. Kiselev, S.A. Krutikhin, G.Y. Kurkin, E.B. Levichev, O.I. Meshkov, S.V. Motygin, S.A. Nikitin, I.B. Nikolaev, V.N. Osipov, V.M. Petrov, E. Rotov, E. Shubin, V.V. Smaluk, G.M. Tumaikin, A.N. Zhuravlev
  BINP SB RAS, Novosibirsk

The VEPP-4M electron-positron collider is now operating with the KEDR detector for high-energy physics experiments in the 1.5−2.0 GeV beam energy range. Parallel with these experiments, the VEPP-4M scientific team carries out a number of accelerator physics investigations. A new registration system for the Touschek polarimeter has been put into operation. A new NMR-based system for suppression of the guide field ripples has been developed. The counting rate of the Touschek particles has been measured as a function of the beam energy in the range from 1.85 to 4 GeV. The measurement results can be claimed at the future super B and C-Tau factories. For simultaneous measurement of the transverse beam position and inclination angle an X-ray multi-pinhole camera has been designed, manufactured and installed at the VEPP-4M. To suppress the longitudinal instability caused by high-order modes of the RF cavities, a feedback system has been developed.