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Figure 2
Top: rotation of a lens about the χ axis. Shown is a wall between two holes, corresponding to two of the PCV lenses shown in Fig. 1[link]. Bottom: at χ = 0, rays traversing the wall travel lengths d1, d2 on- and off-axis, respectively. After rotation, both paths are scaled up by the same factor, [1/\cos\chi]. This changes the number N of walls to the equivalent of [N/\cos\chi] walls.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 22| Part 1| January 2015| Pages 16-22
https://doi.org/10.1107/S1600577514020451
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