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Hybrid diamond-silicon angular-dispersive x-ray monochromator with 025-meV energy bandwidth and high spectral efficiency

DOI: 10.1364/OE.21.030932 DOI Help
PMID: 24514666 PMID Help

Authors: S. Stoupin (Argonne National Laboratory) , Y. V. Shvyd’ko (Argonne National Laboratory) , D. Shu (Argonne National Laboratory) , V. D. Blank (Technological Institute for Superhard and Novel Carbon Materials) , S. A. Terentyev (Technological Institute for Superhard and Novel Carbon Materials) , S. N. Polyakov (Technological Institute for Superhard and Novel Carbon Materials) , M. S. Kuznetsov (Technological Institute for Superhard and Novel Carbon Materials) , I. Lemesh (Technological Institute for Superhard and Novel Carbon Materials) , Kiran Mundboth (Diamond Light Source) , Steve Collins (Diamond Light Source) , John Sutter (Diamond Light Source) , Martin Tolkiehn (DESY)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Optics Express , VOL 21 (25) , PAGES 5518-5529

State: Published (Approved)
Published: December 2013

Abstract: We report on the design, implementation, and performance of an x-ray monochromator with ultra-high energy resolution (ΔE/E ≃ 2.7 × 10−8) and high spectral efficiency using x rays with photon energies E ≃ 9.13 keV. The operating principle of the monochromator is based on the phenomenon of angular dispersion in Bragg back-diffraction. The optical scheme of the monochromator is a modification of a scheme reported earlier [Shvyd’ko et al., Phys. Rev. A 84, 053823 (2011)], WHERE a collimator/wavelength selector Si crystal was replaced with a 100-μm-thick type IIa diamond crystal. This modification provides a very-small-energy bandwidth ΔE ≃ 0.25 meV, a 3-fold increase in the aperture of the accepted beam, a reduction in the cumulative angular dispersion rate of x rays emanating from the monochromator for better focusing on a sample, a sufficient angular acceptance matching the angular divergence of an undulator source (≈ 10 μrad), and an improved throughput due to low x-ray absorption in the thin diamond crystal. The measured spectral efficiency of the monochromator was ≈ 65% with an aperture of 0.3 × 1 mm2. The performance parameters of the monochromator are suitable for inelastic x-ray spectroscopy with an absolute energy resolution ΔE < 1 meV.

Journal Keywords: Diamond; Silicon; X-Ray; Monochromator; Bandwidth; Efficiency

Subject Areas: Technique Development, Physics, Materials

Facility: Advanced Photon Source