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Figure 3
(a) Scheme of horizontal beam focusing with crystal bender. The CCD is positioned at a pre-calculated focal distance. Points L, C and R of the beam correspond to points PL, PC and PR on the CCD. Bender motors are moved until PL, PC and PR converge to one point on the CCD, defined as the focal point (S0). Shown in the inset is the beam profile on the CCD at S0 [The vertical streak is formed because of readout electronics. Potentials are sequenced simultaneously for readout, so as to shift X-ray induced charges towards the output register row. As potential wells are nearly/completely filled due to high beam intensity, a shadow is formed while transferring this charge. In principle, this effect could be removed by a large thick X-ray absorber in front of the CCD.] (b) Horizontal profile of the beam extracted on the CCD. The FWHM of the profile, calculated by CCD software, is 20.5 pixels. (c) Absorption spectra It of (Nb, Zr) foils recorded on the CCD. Incident beam spectra I0 are shown for reference. Large dips in absorption represent (Zr, Nb) K-edges: Xp = 280 (Zr), Xp= 1177 (Nb).

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 27| Part 4| July 2020| Pages 988-998
https://doi.org/10.1107/S1600577520006098
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