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- W4311191193 abstract "SwissFEL has a unique capability, among the normal conducting linac-based light sources, to simultaneously serve two separate undulator lines (Aramis and Athos) up to the machine repetition rate of 100 Hz using the double bunch operation mode. It increases twice the experiments throughput of the facility with modest additional investment. Two electron bunches spaced 28 ns apart are extracted from the cathode by two laser pulses with individually controlled repetition rates. The bunches are accelerated up to about 3 GeV in the main linac using the same rf macropulse. After separation, one bunch serves the Athos soft x-ray beamline and the other is further accelerated to serve the hard x-ray beamline – Aramis. A fast and high-stability beam kicker separates the two bunches without disturbing the electron beam and consequently the x-ray lasing. The timing and control system sets hybrid machine modes utilizing independent operation of the two undulator lines with individually programmed repetition rates. Beam diagnostics and feedback systems have to operate with two closely spaced bunches where the two beams share the same machine path. The low-level rf system manipulates the rf amplitude and phase within a fraction of the rf macropulse to provide decoupling of the acceleration parameters of the first and the second bunch. This manuscript presents measurements that show that the bunch separation does not degrade FEL lasing stability.13 MoreReceived 7 July 2022Accepted 4 November 2022DOI:https://doi.org/10.1103/PhysRevAccelBeams.25.120701Published 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 AreasAccelerator/storage ring control systemsBeam diagnosticsBeam injection, extraction & transportBeam optics correction schemesBeam optics transportBeam processesBeam techniquesRadio frequency power sourcesAccelerators & Beams" @default.
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- W4311191193 date "2022-12-02" @default.
- W4311191193 modified "2023-10-18" @default.
- W4311191193 title "SwissFEL double bunch operation" @default.
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- W4311191193 doi "https://doi.org/10.1103/physrevaccelbeams.25.120701" @default.
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