Author: Hunchak, P.J.
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WEPOST011 Studies on Top-Up Injection into the FCC-ee Collider Ring 1699
SUSPMF006   use link to see paper's listing under its alternate paper code  
 
  • P.J. Hunchak, M.J. Boland
    CLS, Saskatoon, Saskatchewan, Canada
  • M. Aiba
    PSI, Villigen PSI, Switzerland
  • W. Bartmann, Y. Dutheil, M. Hofer, R.L. Ramjiawan, F. Zimmermann
    CERN, Meyrin, Switzerland
  • M.J. Boland
    University of Saskatchewan, Saskatoon, Canada
 
  In order to maximize the luminosity production time in the FCC-ee, top-up injection will be employed. The positron and electron beams will be accelerated to the collision energy in the booster ring before being injected with either a small transverse or longitudinal separation to the stored beam. Using this scheme essentially keeps the beam current constant and, apart from a brief period during the injection process, collision data can be continuously acquired. Two top-up injection schemes, each with on- and off-momentum sub-schemes, viable for FCC-ee have been identified in the past and are studied in further detail to find a suitable design for each of the four operation modes of the FCC-ee. In this paper, injection straight optics, initial injection tracking studies and the effect on the stored beam are presented. Additionally, a basic proxy error lattice is introduced as a first step to studying injection into an imperfect machine.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-WEPOST011  
About • Received ※ 08 June 2022 — Revised ※ 13 June 2022 — Accepted ※ 16 June 2022 — Issue date ※ 19 June 2022
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WEPOTK025 Concepts and Considerations for FCC-ee Top-Up Injection Strategies 2106
 
  • R.L. Ramjiawan, W. Bartmann, Y. Dutheil, M. Hofer
    CERN, Meyrin, Switzerland
  • M. Aiba
    PSI, Villigen PSI, Switzerland
  • P.J. Hunchak
    University of Saskatchewan, Saskatoon, Canada
  • P.J. Hunchak
    CLS, Saskatoon, Saskatchewan, Canada
 
  The Future Circular electron-positron Collider (FCC-ee) is proposed to operate in four modes, with beam energies from 45.6 GeV (Z-pole) to 182.5 GeV (tt-bar production) and luminosities up to 4.6×1036 cm2s-1. At the highest energies the beam lifetime would be less than one hour, meaning that top-up injection will be crucial to maximise the integrated luminosity. Two top-up injection strategies are considered here: conventional injection, employing a closed orbit bump and septum, and multipole-kicker injection, with a pulsed multipole magnet and septum. On-axis and off-axis injections are considered for both. We present a comparison of these injection strategies taking into account aspects such as spatial constraints, machine protection, disturbance to the stored beam and injection efficiency. We overview potential kicker and septum technologies for each.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-WEPOTK025  
About • Received ※ 03 June 2022 — Revised ※ 13 June 2022 — Accepted ※ 14 June 2022 — Issue date ※ 14 June 2022
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