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To reach and maintain its maximum luminosity despite a beam lifetime well below 1 h, the Future Circular Lepton Collider (FCC-ee) relies on top-up injection. The present baseline scheme uses on-axis injection with a conventional one-turn orbit bump. This scheme was selected for the conceptual design study for its reliability and because it is expected to minimise background for the experiments. However, recent developments at several light sources aim at using a multipole injection kicker (MIK) as a bump-free injection alternative to minimise perturbations of the circulating beam.
This paper presents a possible implementation of a MIK for the FCC-ee collider injection scheme using pulsed sextupole or octupole magnets. The methods and results used to evaluate the injection performance against the conventional scheme are also discussed. Furthermore, a compensation scheme is proposed to minimise the effect of the MIK on the circulating beam.
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