Author: Aumon, S.
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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TUOAB02 Low-emittance Tuning for Circular Colliders 57
 
  • T.K. Charles
    The University of Melbourne, Melbourne, Victoria, Australia
  • S. Aumon, B.J. Holzer, K. Oide, T. Tydecks, F. Zimmermann
    CERN, Meyrin, Switzerland
  • K. Oide
    KEK, Ibaraki, Japan
  
  The 100 km FCC-ee e+/e− circular collider requires luminosities in the order of 1035 cm-2 s-1 and very low emittances of 0.27 nm·prad for the horizontal plane and 1 pm·prad in the vertical. In order to reach these requirements, extreme focusing of the beam is needed in the interaction regions, leading to a vertical beta function of 0.8 mm at the IP. These challenges make the FCC-ee design particularly susceptible to misalignment and field errors. This paper describes the tolerance of the machine to magnet alignment errors and the effectiveness of optics and orbit correction methods that were implemented in order to bring the vertical dispersion to acceptable values, which in turn limits the vertical emittance. Thousands of misalignment and error seeds were introduced in MADX simulations and a comprehensive correction strategy, which includes macros based upon Dispersion Free Steering (DFS), linear coupling correction based on Resonant Driving Terms (RDTs) and response matrices, was implemented. The results are summarized in this paper.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-TUOAB02  
About • paper received ※ 11 October 2018       paper accepted ※ 19 February 2019       issue date ※ 21 April 2019  
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