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Figure 3
Around z0 = 0, the differences between the focus along distance (solid lines) and focusing along focal length (dashed lines) reach maximums, which are still quite small for the focusing at 18-ID by the horizontal KB mirror, with 9% difference of focal length (thick lines) and 5% difference of focusing size (fine lines). The optics demagnification depends more on source size and divergence than the ratio of source to focus distances as |z0/z2| becomes small. Focal length changes smoothly when z0 → 0 and z0 → −z2. The relative beam size is the focusing size divided by σθ0z2, the maximal focusing size with the source on the optics.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 17| Part 5| July 2010| Pages 644-652
doi:10.1107/S0909049510024337
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