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Figure 2
A simple model to explain the origin of the stripe pattern in the beam profile downstream of a multilayer monochromator (cf. Fig. 1[link]). Assuming that the multilayer coating reproduces the underlying surface shape of the substrate, intensity stripes are caused by figure errors of the substrate which introduce phase shifts (h: height variation of the multilayer surface; x: position coordinate along the multilayer surface; θ: incidence angle). These shifts are transformed into intensity modulations by the propagation of the beam.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 17| Part 4| May 2010| Pages 496-510
doi:10.1107/S0909049510011623
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