Diaboloid mirror for a bending magnet beamline

Yujia Ding; Carlo Segre; Ali Khounsary

doi:10.1117/12.2594663

21 September 2021 Diaboloid mirror for a bending magnet beamline

Yujia Ding, Carlo Segre, Ali Khounsary

Proceedings Volume 11837, Advances in X-Ray/EUV Optics and Components XVI; 118370A (2021) https://doi.org/10.1117/12.2594663
Event: SPIE Optical Engineering + Applications, 2021, San Diego, California, United States

Abstract

An upgrade of the IIT bending magnet beamline (10-BM) at Argonne National Laboratory is described. The goal is to provide a higher photon flux, approaching the theoretical limits, by incorporating focusing mirrors. This would allow faster in situ x-ray absorption spectroscopy measurements in the 5-30 keV photon energy range with higher spectral resolution. This upgrade is accomplished by incorporating a pair of focusing mirrors such that the current beamline layout and experimental hutches are preserved. The first mirror, upstream of the monochromator system, collimates the beam vertically to increase the monochromator throughput. The second mirror, downstream of the monochromator, focuses the resulting monochromatic beam in both the horizontal and vertical directions. Toroidal, bent cone, and diaboloid mirror profiles are compared. It is shown that a diaboloid mirror provides the best option given the beamline physical constraints. Challenges in the fabrication of this mirror are discussed. The complications due to the strong absorption edges of the mirror surface are mitigated by a tri-layer coating of Sb/Pt/Cr over the entire mirror surface. Simulation results show that the coated diaboloid mirror would focus the beam with minimal aberrations and provide an approximately 300-fold increase in flux onto a 0.2 x 0.2 mm2 aperture at 30 m from the source.

Citation Download Citation

Yujia Ding, Carlo Segre, and Ali Khounsary "Diaboloid mirror for a bending magnet beamline", Proc. SPIE 11837, Advances in X-Ray/EUV Optics and Components XVI, 118370A (21 September 2021); https://doi.org/10.1117/12.2594663

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KEYWORDS

Mirrors

Coating

Platinum

Reflectivity

Antimony

Absorption

Optical simulations

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