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- W2953236798 abstract "A tuning method for hard x-ray free electron lasers is presented which combines electron-beam-based alignment (EBBA) with undulator radiation spectrum analysis. This method is conducive to achieving a dispersion-free orbit, finding the undulator field center, and determining the accurate value of the gap distance for the operating undulator K for each undulator segment, and it proves to be highly reliable and robust for free electron laser lasing with variable-gap undulators. The effect of the natural focusing of the undulator on the EBBA is confirmed with measurements and a theoretical analysis. The tilt of an undulator segment subject to ground movement introduces an undulator field change which the electron beam interacts with and can be corrected by K tuning to find a precise compensating gap distance. Lattice matching with a wire-scanner-based Twiss parameter measurement along the undulator line enables the EBBA reference orbit to coincide with the e-beam distribution.10 MoreReceived 28 March 2019DOI:https://doi.org/10.1103/PhysRevAccelBeams.22.060703Published 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 optics correction schemesAccelerators & Beams" @default.
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- W2953236798 date "2019-06-21" @default.
- W2953236798 modified "2023-10-14" @default.
- W2953236798 title "X-ray free electron laser tuning for variable-gap undulators" @default.
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- W2953236798 doi "https://doi.org/10.1103/physrevaccelbeams.22.060703" @default.
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