Author: Hunchak, P.J.
Paper Title Page
TUYAT0102 FCC-ee Lattice Design 52
 
  • J. Keintzel, A. Abramov, M. Benedikt, M. Hofer, K. Oide, R. Tomás García, F. Zimmermann
    CERN, Meyrin, Switzerland
  • P.J. Hunchak
    University of Saskatchewan, Saskatoon, Canada
  • T.O. Raubenheimer
    SLAC, Menlo Park, California, USA
  
  Funding: The work is also supported by the FCC-IS project, receiving funding from the European Union’s H2020 Framework Programme under grant agreement no. 951754.
Within the framework of the Future Circular Collider Feasibility and Design Study, the design of the electron-positron collider FCC-ee is being optimised, as a possible future double collider ring, currently foreseen to start operation during the 2040s. FCC-ee is designed to operate at four different energy stages, allowing for precision measurements: from the Z-pole up to above the ttbar-threshold. This synchrotron with almost 100 km circumference is designed including advanced accelerator concepts, such as the crab-waist collision scheme or one combined off-momentum and betatron collimation insertion. Furthermore, numerous optics tuning and measurement studies are being performed to drive the collider design at an early stage and guarantee its feasibility and efficient operation. 		 
slides icon Slides TUYAT0102 [3.431 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-eeFACT2022-TUYAT0102  
About • Received ※ 29 November 2022 — Revised ※ 06 February 2023 — Accepted ※ 08 February 2023 — Issue date ※ 11 February 2023
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THXAT0104 FCC-ee e+e− Injection and Booster rRng 227
 
  • R.L. Ramjiawan, M.J. Barnes, W. Bartmann, J.C.C.M. Borburgh, Y. Dutheil, M. Hofer
    CERN, Meyrin, Switzerland
  • A. Chancé
    CEA, Gif-sur-Yvette, France
  • B. Dalena
    CEA-IRFU, Gif-sur-Yvette, France
  • E.R. Howling
    Royal Holloway, University of London, Surrey, United Kingdom
  • P.J. Hunchak
    University of Saskatchewan, Saskatoon, Canada
  
  Funding: This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 951754.
The Future Circular electron-positron Collider (FCC-ee) is a proposal for a 91.17 km collider, which would operate in four modes with energies ranging from 45.6 GeV (Z-pole) to 182.5 GeV (ttbar-production). At high energies the beam lifetime could be as low as 6 minutes, requiring the beam to be continuously topped up to reach a high integrated luminosity. This top-up injection would use a separate booster ring in the same tunnel as the collider, which would accelerate the beams to the collider energy. The booster ring should achieve a lower equilibrium emittance than the collider, despite challenges such as a long damping time and no magnet-strength tapering to compensate for the impact of synchrotron radiation. For top-up injection into the collider, we consider two strategies: conventional bump injection, employing a closed orbit bump, and injection using a multipole kicker magnet. On-axis and off-axis sub-schemes will be studied for both. We compare these injection strategies on aspects including spatial constraints, machine protection, perturbation to the stored beam and hardware parameters. 		 
slides icon Slides THXAT0104 [3.137 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-eeFACT2022-THXAT0104  
About • Received ※ 27 October 2022 — Revised ※ 03 February 2023 — Accepted ※ 07 February 2023 — Issue date ※ 12 February 2023
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