Optimization of a seeded free-electron laser with helical undulators.
Seeded single pass free-electron lasers are promising coherent, short-duration, and intense light sources, from the visible to x rays. Operated with adjustable undulators, they are also a unique device for providing fully variable polarized radiation. We report here the first seeding of helical undulators with a variable polarized source. We demonstrate that the adjustment of the seed polarization and focusing allows the free-electron laser radiation to be optimized in terms of intensity and quality.
Labat
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Centre CEA-Saclay, DSM/DRECAM/SPAM, 91 191 Gif-sur-Yvette, France. marie.labat@synchrotron-soleil.fr
Hosaka
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Shimada
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Katoh
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Couprie
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