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Proceedings Paper

Visible/IR light and x-rays in femtosecond synchronism from an x-ray free-electron laser
Author(s): B. W. Adams
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Paper Abstract

A way is proposed to obtain pulses of visible/infrared light in femtosecond synchronism with x-rays from an x-ray free-electron laser (XFEL), using the recently proposed emittance-slicing technique. In an XFEL undulator, only the short section of an electron bunch whose emittance is left unchanged by the slicing will emit intense coherent x-rays in the XFEL undulator. At the same time, the bunch emits highly collimated transition undulator radiation (TUR) into a cone whose opening angle is the reciprocal relativisticity parameter gamma. Due to the variation of the transverse momentum induced by the emittance slicing, the effective number of charges contributing to the TUR varies along the bunch, and is higher in the sliced-out part that emits the coherent x-rays. As with coherent synchrotron radiation (CSR), the TUR is thus coherently enhanced (CTUR) at near-infrared wavelengths. Coming from the same part of the bunch the CTUR and the coherent x-rays are perfectly synchronized to each other. Because both types of radiation are generated in the long straight XFEL undulator, there are no dispersion effects that might induce a timing jitter. With typical XFEL parameters, the energy content of the single optical cycle of near-IR CTUR light is about 100 Nano-Joule, which is quite sufficient for most pump-probe experiments.

Paper Details

Date Published: 22 September 2005
PDF: 6 pages
Proc. SPIE 5920, Ultrafast X-Ray Detectors, High-Speed Imaging, and Applications, 59200E (22 September 2005); doi: 10.1117/12.620282
Show Author Affiliations
B. W. Adams, Argonne National Lab. (United States)


Published in SPIE Proceedings Vol. 5920:
Ultrafast X-Ray Detectors, High-Speed Imaging, and Applications
Zenghu Chang; Stuart Kleinfelder; Dennis L. Paisley; Jean-Claude Kieffer; Jerome B. Hastings, Editor(s)

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