Author: Shatilov, D.N.
Paper Title Page
MOYAA01 Several Topics on Beam Dynamics in FCC-ee 18
 
  • K. Oide
    KEK, Ibaraki, Japan
  • S. Aumon, T.K. Charles, D. El Khechen, T. Tydecks
    CERN, Geneva, Switzerland
  • D.N. Shatilov
    BINP SB RAS, Novosibirsk, Russia
  
  Funding: Work supported by the European Commission under Capacities 7th Framework Programme project EuCARD–2, grant agreement 312453, and the Horizon 2020 Programme project CREMLIN, grant agreement 654166.
Several studies on the beam dynamics at FCC-ee: low emittance tuning, dynamic aperture, beam blowup with/without beam beam, will be introduced. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-MOYAA01  
About • paper received ※ 23 September 2018       paper accepted ※ 19 February 2019       issue date ※ 21 April 2019  
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MOYBA01 Round Colliding Beams at Vepp-2000 with Extreme Tuneshifts 34
 
  • D.B. Shwartz, V.V. Anashin, O.V. Belikov, D.E. Berkaev, K. Gorchakov, A.S. Kasaev, A.N. Kirpotin, I. Koop, A.A. Krasnov, G.Y. Kurkin, A.P. Lysenko, S.V. Motygin, E. Perevedentsev, V.P. Prosvetov, D.V. Rabusov, Yu. A. Rogovsky, A.M. Semenov, A.I. Senchenko, D.N. Shatilov, P.Yu. Shatunov, Y.M. Shatunov, O.S. Shubina, M.V. Timoshenko, I.M. Zemlyansky, Yu.M. Zharinov
    BINP SB RAS, Novosibirsk, Russia
  • I. Koop, E. Perevedentsev, Yu. A. Rogovsky, A.I. Senchenko, Y.M. Shatunov, D.B. Shwartz
    NSU, Novosibirsk, Russia
  
  VEPP-2000 is the only electron-positron collider operating with round beams that allow to enhance beam-beam limit. VEPP-2000 with SND and CMD-3 detectors carried out two successful data-taking runs after new BINP injection complex was commissioned. The 2016/2017 run was dedicated to high energy range (640-1000 MeV per beam) while the 2017/2018 run was focused at 275-600 MeV/beam energies. With sufficient positron production rate and upgraded full-energy booster the collider luminosity was limited by beam-beam effects, namely flip-flop effect. Thorough machine tuning together with new ideas introduced to suppress flip-flop allowed to achieve high beam-beam tuneshift and bunch-by-bunch luminosity values at specific beam energies. The achieved luminosity increased 2-5 times in a whole energy range in comparison to phase-1 operation (2010-2013).  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-MOYBA01  
About • paper received ※ 11 October 2018       paper accepted ※ 19 February 2019       issue date ※ 21 April 2019  
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TUYBA02 Beam-beam Effects at High Energy e+e− Colliders 106
 
  • D.N. Shatilov
    BINP SB RAS, Novosibirsk, Russia
  
  Funding: Russian Science Foundation, project N14-50-00080.
One of the main requirements for future e+e− colliders is high luminosity. If the energy per beam does not exceed 200 GeV, the optimal choice will be a circular collider with "crab waist" collision scheme. Here, to achieve maximum luminosity, the beams should have a very high density at the IP. For this reason, radiation in the field of a counter bunch (BS - beamstrahlung) becomes an appreciable factor affecting the dynamics of particles. In particular, in the simulation for FCC-ee, new phenomena were discovered: 3D flip-flop and coherent X-Z instability. The first is directly related to BS. The second can manifest itself at low energy (where BS is negligible), but at high energies BS substantially changes the picture. In the example of FCC-ee, we will consider the features of beam-beam interaction at high-energy crab waist colliders, and optimization of parameters for high luminosity. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-TUYBA02  
About • paper received ※ 19 October 2018       paper accepted ※ 19 February 2019       issue date ※ 21 April 2019  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)