Abstract
The full-energy beam injection system from SACLA to the SPring-8 storage ring has been developed. Low-emittance beam injection is required for the future upgrade of SPring-8 due to its small injection beam aperture. The electron beam injection from an X-ray free-electron laser linear accelerator not only satisfies the emittance requirement but also it confers a cost benefit compared to a conventional dedicated injector system. In SPring-8, the SACLA linear accelerator is now delivering X-ray free-electron laser photon beams and serving as a full-time injector of SPring-8 in parallel.2 MoreReceived 13 August 2021Accepted 11 October 2021DOI:https://doi.org/10.1103/PhysRevAccelBeams.24.110702Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.Published by the American Physical SocietyPhysics Subject Headings (PhySH)Research AreasBeam injection, extraction & transportBeam opticsBeam optics transportPhysical SystemsFree-electron lasersSynchrotron radiation & free-electron lasersSynchrotron radiation facilitiesAccelerators & Beams
Highlights
A small dynamic aperture for injected electron beams becomes an issue in recent upgrade of storage ring-based light sources pursuing low-emittance toward a diffraction limit [1,2,3]
Comparing Eqs. (1) and (2) for the case of the small emittance beam of 150 pm rad passing through XFEL to Storage ring Beam Transport line (XSBT), it is found that the radiation damping is three orders of magnitude smaller than the quantum excitation and almost negligible
The X-ray free-electron laser (XFEL) linear accelerator has been successfully used as a low-emittance injector of the SPring-8 storage ring since September 2020
Summary
A small dynamic aperture for injected electron beams becomes an issue in recent upgrade of storage ring-based light sources pursuing low-emittance toward a diffraction limit [1,2,3]. A conventional off axis injection scheme using kicker and in-vacuum septum magnets in SPring-8-II, which is the upgrade project of SPring-8 [8,9]. The emittance of the injected beam is significantly reduced by using a low-emittance linear accelerator of an X-ray free-electron laser (XFEL). Ahead of the upgrade project, the full-energy beam injection from SACLA had been tested since 2019 using the present SPring-8 storage ring. In case of a conventional dedicated injector system, accelerators are always kept in operation for top-up injection, and the electron beam is injected only a few times per minute with consuming electricity at most of the time just for idling the accelerators. Down the more than twenty-year-old injector system consisting of a 1 GeV linear accelerator and an 8 GeV synchrotron
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