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Figure 13
Figures of merit determined from the best-fit super-Gaussians of experimental beam profiles. (a) FWHM is 4–5 um as required, (b) p (higher value shows a flatter top super-Gaussian), (c) R2 (closer to 1 indicates lower striation). As expected, the seven-segment modification provides a better approximation to a flat-top intensity profile. The crosses show the results for the earlier set of knife-edge scans displayed in Fig. 12[link]. The label for each cross shows the beam size. The placement of the crosses at 386 mm on the graphs is only to allow them to be compared with the results for the re-entrant modifications.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 23| Part 6| November 2016| Pages 1333-1347
https://doi.org/10.1107/S1600577516013308
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