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![[Figure 4]](ok5135fig4mag.jpg)
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Figure 4
(a) Calculated emission images of a Laue analyzer for different photon energies when working under the off-Rowland condition. A point-like source with beam size of 100 µm × 100 µm in FWHM, energy resolution of 1.4 × 10−4 (ΔE/E, where ΔE is defined by FWHM) and varying incoming beam central energies were considered as the emitted source. A Si(333) Laue analyzer with a cylindrical shape and a bent curvature of 155 cm was used. Surface distortions were omitted here to simplify the X-ray tracing. The analyzer is positioned 5 cm farther from the Rowland circle. The red boxes in the figures represent a realistic size of a Laue analyzer. (b) Energy resolution evaluation using a beam size of 144 µm. A 15 mm-wide region of interest (ROI) at the central position is selected to project the elastic scattering spectrum. A series of Gaussian fittings are performed to extract the peak positions, followed by polynomial fitting to determine the position-to-energy calibration. The energy resolution of the analyzer is then obtained by deconvoluting the Gaussian functions. (c) The energy resolution as a function of beam size is determined using the same procedure described in (b) for various beam sizes. |
![[Figure 4]](ok5135fig4.jpg)
 | JOURNAL OF SYNCHROTRON RADIATION |
ISSN: 1600-5775
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