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Figure 20
Schematic view of the phase increase, ϕ, inside and between two neighbouring undulators. The fundamental parameters [\Delta\psi] and d are highlighted, where the former ([\Delta\psi]) is the offset between the linear extrapolated phase between two undulators (the slope of the two red lines has to be identical and equal to [1/\lambda_{\rm{u}}] if K of both undulators is the same) and the latter (d) is the distance between the central zeros of the two consecutive undulators.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 25| Part 3| May 2018| Pages 686-705
https://doi.org/10.1107/S1600577518002205
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