eeFACT2022 - List of Authors (Ramjiawan, R.L.)

Paper	Title	Page
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 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
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

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 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

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)