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abstract:
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We report the results of a high energy spread SASE FEL
experiment, the intermediary experiment linking the VISA
I and VISA II projects. A highly chirped beam (1.7 %) was
transported, without corrections of longitudinal aberrations
in the ATF dogleg, and injected into the VISA undulator.
The ouput radiation displayed an uncharacteristicly large
bandwidth (12 %) with extremely stable lasing and mea-
sured energy of about 2 μJ . Start-to-end simulations re-
produced key features of the experiment and provided an
insight into the michanisms giving rise to such a high band-
width. These analyses have important implications on the
VISA II experiment.
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