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- Title
Demonstration of self-seeding in a hard-X-ray free-electron laser.
- Authors
Amann, J.; Berg, W.; Blank, V.; Decker, F.-J.; Ding, Y.; Emma, P.; Feng, Y.; Frisch, J.; Fritz, D.; Hastings, J.; Huang, Z.; Krzywinski, J.; Lindberg, R.; Loos, H.; Lutman, A.; Nuhn, H.-D.; Ratner, D.; Rzepiela, J.; Shu, D.; Shvyd'ko, Yu.
- Abstract
The Linac Coherent Light Source (LCLS) is an X-ray free-electron laser at the SLAC National Accelerator Laboratory, which has been operating since 2009 for a wide range of scientific research. The free-electron laser process at LCLS is based on self-amplified spontaneous emission (SASE) where spontaneous emission from the initial electron beam shot noise is amplified by its interaction with the electrons over a long magnetic undulator. Although SASE is very effective, producing tremendously powerful, ultrashort X-ray beams, the start-up from noise leaves poor temporal coherence and a broad, noisy spectrum. We present experimental results of a new method, suggested by colleagues at DESY, allowing self-seeding using X-rays from the first half of the undulator to seed the second half through a diamond-based monochromator, producing near Fourier-transform-limited X-ray pulses with 0.4-0.5 eV bandwidth at 8-9 keV. These results demonstrate self-seeding at ångstrom wavelengths with a relative bandwidth reduction of 40-50 with respect to SASE.
- Subjects
SOWING; FREE electron lasers; ELECTRON beams; MONOCHROMATORS; FOURIER transforms; BANDWIDTHS
- Publication
Nature Photonics, 2012, Vol 6, Issue 10, p693
- ISSN
1749-4885
- Publication type
Article
- DOI
10.1038/nphoton.2012.180