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Smaluk, V. V.

Paper Title Page
TUPC09 Design of the cavity BPM system for FERMI@elettra 165
 
  • P. Craievich, C. Bontoiu, M. Ferianis, G. Trovato
    ELETTRA, Basovizza, Trieste
  • M. Poggi
    INFN/LNL, Legnaro, Padova
  • V. V. Smaluk
    BINP SB RAS, Novosibirsk
  
  The cavity Beam Position Monitor (BPM) is a fundamental instrument for a seeded FEL, as FERMI@elettra. It allows the measurement of the bunch trajectory non-destructively, on a shot-by shot basis and with sub-micron resolution. The high resolution the cavity BPM is providing relies on the excitation of the dipole mode, originated when the bunch passes off axis in the cavity. Here we present the electromagnetic (EM) design and the cold test of the prototype BPM developed for the FERMI@elettra. The design adopted a C-band cavity with its dipole mode at fDIP=6.5GHz. The prototype is actually fitted with two cavities: one for the position measurement and one for the generation of the reference signal for the demodulator. Furthermore, the design of the prototype electronics for the acquisition and processing of the BPM signals is presented. The adopted scheme consists of a down converter from C-band to the intermediate frequency, followed by an IQ demodulator to generate the base-band signal, proportional to the transverse beam position. The performed simulation session is presented as well which we run before building the hardware for bench tests.  
WEPB04 The VEPP-4M Dynamic Aperture Determination Through the Precise Measurement of the Beam Lifetime 238
 
  • A. N. Zhuravlev, S. I. Gluhov, V. F. Gurko, A. D. Khilchenko, V. A. Kiselev, A. N. Kvashnin, E. B. Levichev, O. I. Meshkov, P. A. Piminov, V. V. Smaluk, P. V. Zubarev
    BINP SB RAS, Novosibirsk
  
  To determine experimentally the particle stable area in the electron-positron collider VEPP-4M we measure the beam life time with high accuracy as a function of moving aperture. The measurement is performed by a photodiode installed in the collider diagnostic beam line. The experimental set up and the measurement results are described. Comparison with the tracking simulation is presented.  
WEPB06 Direct Comparison of the Methods of Beam Energy Spread Determination in the VEPP-4M Collider 244
 
  • O. I. Meshkov, V. A. Kiselev, N. Yu. Muchnoi, S. V. Sinyatkin, V. V. Smaluk, V. N. Zhilich, A. N. Zhuravlev
    BINP SB RAS, Novosibirsk
  
  The VEPP-4M electron-positron collider is now operating with the KEDR detector for the experiment of precise measurement of tau-lepton mass. The nearest experimental program of the accelerator includes scan of the energy area below J/psi meson to search narrow resonances. The monitoring of beam energy spread is important to know the energy spread contribution into the total systematic error. In this report we discuss the application of several diagnostics for beam energy spread measurement. The data obtained with Compton BackScattering (CBS) technique* are compared with the value of the spread derived from the betatron motion of the beam**. The measurements by all the methods were done at the same accelerator run, i.e. the different diagnostics can be compared directly. The value of the energy spread was determined for a set of collider operating modes, covering the energy area from 1200 MeV up to 1843 MeV. Width of the J/psi and psi' resonance measured with the KEDR detector is used as a reference.

References*N. Muchnoi et al. //Proceed. of EPAC 2006, Edinburg, Scotland, TUPCH074**T. Nakamura et al. // Proceed. of the 2001 Particle Accelerator Conference, Chicago, p. 1972-1974.

 
WEPC26 Transverse Bunch-by-Bunch Feedback for the VEPP-4M Electron-Positron Collider 367
 
  • V. P. Cherepanov, E. N. Dementyev, E. B. Levichev, A. S. Medvedko, V. V. Smaluk, D. P. Sukhanov
    BINP SB RAS, Novosibirsk
  
  Transverse mode coupling instability (TMCI or fast head-tail) is the principal beam current limitation of the VEPP-4M electron-positron collider. For the high-energy physics experiments at the 5.5 GeV energy, the VEPP-4M bunch current should exceed much the TMCI threshold. To suppress transverse beam instabilities, a broadband bunch-by-bunch digital feedback system is developed. The feedback concept is described, the system layout and first beam measurements are presented.