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Figure 2
Calculated shift and broadening of the spectral peak by emittance and aperture, for the ERL 25 m planar undulator in high coherence mode. The solid line is the on-axis spectrum of the flux density with zero emittance and zero energy spread; the dotted line is the spectrum with finite emittance and energy spread, and the dashed line is the flux spectrum through a 600 µm-diameter pinhole located 45 m away from the source. The FWHMs of the curves are 7.8 eV, 12.3 eV and 50.5 eV, respectively.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 21| Part 2| February 2014| Pages 366-375
doi:10.1107/S1600577514000514
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