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Figure 4
A conceptual sketch of the progressive KB relaxation. (a) The focus lies either in the nominal plane, at a distance q from the KB centre (focusing mode), or a little bit away from it (tens of millimetres). The detected R is typically around the one metre mark. (b) By progressively relaxing the KB curvature, the focus shifts away, falling into the so-called `mild collimation' (R of the order of a few metres) and `strong collimation' (R in the order of tens or hundreds of metres) regimes. (c) A further KB relaxation leads first to ideal collimation (R → ∞) and then to a diverging beam (produced by a change in the substrate curvature). Experimentally, the collimation regime corresponds to positive-to-negative fluctuations of R around ±104 m, which conceptually corresponds to fluctuations around ±∞.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 31| Part 5| September 2024| Pages 1058-1066
https://doi.org/10.1107/S160057752400626X
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