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Figure 6
FEL intensity distribution as seen at the spectrometer detector. Top: a perfect Gaussian beam is emitted by the FEL and its vertical projection is seen as a Gaussian. Centre: a hollow mode caused by an off-resonant condition of the undulators is projected as two vertical peaks. Bottom: a set of mixed modes (Gaussian and hollows) is seen as a central Gaussian and some vertical satellites.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 23| Part 1| January 2016| Pages 35-42
doi:10.1107/S1600577515021116
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