Abstract
A light source based on the combination of an energy-recovery linac (ERL) and a storage ring is a feasible scheme for next generation light sources. We propose a system with which a beam of an ERL circulates through two or four turns in a storage ring. The system consists of several deflecting cavities and static deflecting magnets. With this system, the average current of the ring can be two or four times higher than that of the ERL, thus easing the burden on the ERL. Resultant low bunch current can lead to a high quality ERL beam and low average current of the ERL can lead to a multipass scheme.
Highlights
Light sources based on energy-recovery linacs (ERLs) [1,2,3,4,5,6,7,8,9] are the likely candidates for generation light sources and a GeV-scale energy-recovery experiment was successfully carried out at CEBAF [3]
We propose a two- and a four-turn circulation system for an ERL beam in a storage ring, which increases the average current of the storage ring two or four times more than the average current of an ERL which is limited by beam breakup instabilities [10 –13] or by the performance of electron sources. [14 –17]
Resultant lower bunch current can lead to a beam of higher quality and low average current of ERLs can lead to multipass schemes
Summary
Light sources based on energy-recovery linacs (ERLs) [1,2,3,4,5,6,7,8,9] are the likely candidates for generation light sources and a GeV-scale energy-recovery experiment was successfully carried out at CEBAF [3]. At CTF3 at CERN, deflection cavities with frequency multiplication rings are used to increase bunch rates [31,32,33,34,35,36], and, at the ILC damping ring, deflection cavities are proposed for devices to manipulate bunch-by-bunch trajectories for injection and extraction [36,37]. Such systems cannot be applied for the multiturn circulation systems proposed in this paper
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