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Figure 2
(a) Reconstructed FEL spot size for λ = 32 nm, using a wavefront sensor detector placed 950 mm downstream of the KB optics focal plane. (b) Distortion of the FEL wavefront owing to the high-order transversal mode, emitted by the source, and optic imperfections were measured to be 0.25λ RMS and 1.2λ peak-to-valley (PV). (c) Reconstructed spot size in the same experimental condition as (a) obtained defining the beam before the KB optics with mechanical baffles; the suppression of the high-order modes emitted by the source improves the spot quality into the focal plane and the flatness of the FEL wavefront to a distortion level of 0.13λ in RMS and 0.5λ in PV.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 22| Part 3| May 2015| Pages 544-552
https://doi.org/10.1107/S1600577515004919
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