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![[Figure 3]](ye5062fig3mag.jpg)
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Figure 3
(a) APS-U undulator (U28) spectra through 300 µm × 300 µm slits in front of the KB mirrors measured at different undulator tapering values by scanning the Si(111) monochromator and recording ion chamber readings downstream of the slits. (b) U28 spectra measured through 20 µm × 300 µm (horizontal × vertical) slits at different horizontal positions (−150 µm, 0 µm, 150 µm) with 0.5 keV undulator tapering and compared with the spectrum measured through 300 µm × 300 µm slits (downscaled by a factor of 15). The reduced intensity at 150 µm is attributed to a drop in the storage ring current. These scans confirm that X-ray energies are homogeneously distributed within the 300 µm × 300 µm slits. |
![[Figure 3]](ye5062fig3.jpg)
 | JOURNAL OF SYNCHROTRON RADIATION |
ISSN: 1600-5775
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