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- W4386042287 abstract "The Illinois Institute of Technology’s bending magnet (10-BM) beamline at Argonne National Laboratory is being upgraded to deliver a significantly higher photon flux with improved spectral resolution in the 4-33 keV photon energy range. This will allow faster X-ray absorption spectroscopy measurements. The plan is to use an aspherical focusing mirror downstream of the X-ray monochromator to collect and focus a significant part of the vertically collimated horizontally divergent beam. The mirror surface is typically coated with high-atomic-number elements such as platinum (Pt) to reflect the higher energy photons. The absorption edges of such coating materials, however, introduce experimental complications when measuring samples at or near those edges. This is typically addressed by either deploying a pair of side-by-side mirrors with different coatings, or two parallel coating stripes of various elements along the length of a single mirror, which does not apply to this two-dimensional focusing optics. This paper reports on a multilayer coating that provides high reflectivity over the entire energy range with minimal absorption edges. A pair of flat silicon mirrors were coated with a bilayer of Pt (20 nm) and Al2O3 (10 nm). One of the mirrors was then coated with an additional carbon layer (8 nm). The reflectivity of both mirrors was measured and then re-measured after they were both heated to 70° C for 8 hours for a stability test. Experimental results show excellent stability, high reflectivity over the energy range of 4-33 keV, and the suppression of the Pt absorption edges to below 1%." @default.
- W4386042287 created "2023-08-22" @default.
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- W4386042287 date "2023-10-04" @default.
- W4386042287 modified "2023-10-09" @default.
- W4386042287 title "High-reflectivity x-ray mirror with suppressed absorption edges over a wide energy range" @default.
- W4386042287 doi "https://doi.org/10.1117/12.2682020" @default.
- W4386042287 hasPublicationYear "2023" @default.
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