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Figure 4
The (a) P1 and (b) P3 Stokes–Poincaré parameters plotted as a function of row phase and gap offset from their nominal values at LA45° form surfaces which intersect the plane (green) of P1 = P3 = 0 (the expected values at LA45°). The best-fit lines of intersection (blue) for the two parameters cross at a common value of the row phase and gap offset which provides an undulator setting that should minimize both P1 and P3 simultaneously.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 25| Part 2| March 2018| Pages 378-384
https://doi.org/10.1107/S1600577518001960
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