X-ray free electron laser tuning for variable-gap undulators

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 th...

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Published inPhysical review. Accelerators and beams Vol. 22; no. 6; p. 060703
Main Authors Kang, Heung-Sik, Loos, Henrik
Format Journal Article
LanguageEnglish
Published College Park American Physical Society 21.06.2019
American Physical Society (APS)
Subjects
Electron beams
Free electron lasers
Ground motion
Lattice matching
OTHER INSTRUMENTATION
Segments
Spectrum analysis
Tuning
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ISSN2469-9888
2469-9888
DOI10.1103/PhysRevAccelBeams.22.060703

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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 undulatorKfor 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 byKtuning 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 thee-beam distribution.
AbstractList 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.
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 undulatorKfor 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 byKtuning 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 thee-beam distribution.
ArticleNumber 060703
Author Loos, Henrik
Kang, Heung-Sik
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CitedBy_id crossref_primary_10_1016_j_nima_2020_164726
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Cites_doi 10.1016/j.nima.2016.04.057
10.1016/S0168-9002(99)00117-5
10.3390/app7070720
10.1088/1742-6596/874/1/012088
10.1016/j.nima.2018.09.122
10.1038/s41566-017-0029-8
10.1038/nphoton.2010.176
10.1038/nphoton.2012.141
10.1103/PhysRevSTAB.15.110701
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Snippet A tuning method for hard x-ray free electron lasers is presented which combines electron-beam-based alignment (EBBA) with undulator radiation spectrum...
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StartPage 060703
SubjectTerms Electron beams
Free electron lasers
Ground motion
Lattice matching
OTHER INSTRUMENTATION
Segments
Spectrum analysis
Tuning
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Title X-ray free electron laser tuning for variable-gap undulators
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