Author: Piminov, P.A.
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TUZMH01
 Start VEPP-4M Facility Operation at High Energy  
 
  • P.A. Piminov
    BINP SB RAS, Novosibirsk, Russia
  
  The electron positron collider VEPP-4M finished low energy luminosity run (up to 1.9 GeV). New experimental stage will be performed with the beam acceleration in VEPP-4M. The experiment of the adron cross section measure in 17 points from 2.5 to 3.5 GeV beam energy was started in December 2017. One of two scans of the experiment (8 points) is made. Next experiments are the collecting data at maximal beam energy for gamma-gamma physics and Y-mesons study. The first luminosity at Y(1S) meson (~4.75 GeV) is obtained. For maximal luminosity at high energy the new electron positron injector is used. To obtain maximal beam energy of 5.2 GeV upgrade of RF system and power supply system of VEPP-4M is performing. The laser polarimeter is used to measure the beam energy with resonance depolarization at high energy of VEPP-4M. Synchrotron radiation experiments in hard X-ray mode are performed at 4.5 GeV with new hybrid 2 T wiggler.  
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TUPSA01
 Design of Beam Optics for Electron Positron Collider Super Charm Tau Factory  
 
  • P.A. Piminov
    BINP SB RAS, Novosibirsk, Russia
  
  The Super Charm Tau Factory is a double ring electron positron collider with beam energy from 1 to 2.5 GeV and luminosity of 1035 cm-2·s−1. The beam optics includes the Crab Waist interaction region within two local chromaticity correction cells, low emittance arcs and special dispersion free sections. Five Siberian snake allows creating the longitudinal polarization of electron beam at the interaction point in while energy range. Four superconducting wigglers inserted in special sections control the beam parameters. The long straight section consists the RF system and the injection cell. The nonlinear dynamics is considered. The design of main magnets is performed.  
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THPSC29 Measurements of Energy Spread at VEPP-4M 469
 
  • V.M. Borin, V.A. Kiselev, O.I. Meshkov, S.A. Nikitin, P.A. Piminov, S.V. Sinyatkin
    BINP SB RAS, Novosibirsk, Russia
  • V.L. Dorokhov
    BINP, Novosibirsk, Russia
  • A. V. Smirnov
    GPI, Moscow, Russia
  
  The unique feature of the VEPP-4M electron-positron collider is wide energy range (1 - 4.75 GeV) available for experiments in high-energy physics. Energy spread value of the beam is an important parameter in a choice of energy step during measurement of e+e− -> hadrons cross sections as well as it has a strong influence on the statistic collection time required for the scanning of narrow resonances like planned for the nearest future scan of Upsilon(2s) meson. Thus, it is important to control energy spread of the beam and measure it operatively and reliably. The paper presents measurements of the beam energy spread at the VEPP-4M electron-positron collider in its complete energy range. Energy spread was calculated from bunch length measured by "PS-1/S1" streak camera with picosecond temporal resolution. In order to exclude the influence of collective effects on bunch length, we measured length of low-intensity bunch. Values of energy spread calculated from bunch length were checked by the measurements of energy spread based on registration of beam decoherence. The impact of the Touschek effect in the beam energy spread at low energy range (1.0 - 1.5 GeV) is discussed.  
DOI • reference for this paper ※ https://doi.org/10.5072/JACoW-RuPAC2018-THPSC29  
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