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Figure 5
Optimum geometric apertures for refractive lenses depending on photon energy. The focal length is always adjusted according to (27)[link] with a step height of Δy = 10 µm. The curves for the materials pmma, Si and Ni refer to clessidra lenses and are obtained using (30)[link]. The dashed curve refers to a Be CRL and is calculated using (10)[link] for the same focal lengths. The thick solid line indicates the upper aperture limit of A = 1 mm for an aspect ratio of a = 100, and the dotted line is the `thin lens' limit according to (45)[link] for pmma clessidras.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 13| Part 3| April 2006| Pages 239-252
doi:10.1107/S0909049506004936
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