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4 October 2024 Inelastic x-ray scattering (IXS) spectrometer design studies at LCLS
Yoshio Ichii, Frank P. O'Dowd, Quentin Yougoubare, Matthew H. Seaberg, Randy A. Whitney, May Ling Ng, Lin Zhang, Robert A. Baker, Luca Rebuffi, Hasan Yavas
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Proceedings Volume PC13150, Advances in X-Ray/EUV Optics and Components XIX; PC1315007 (2024) https://doi.org/10.1117/12.3026062
Event: Optical Engineering + Applications, 2024, San Diego, California, United States
Abstract
While there are many variations of an Inelastic X-ray Scattering (IXS) spectrometer, the figure of merit is often the energy resolution and the throughput. As part of the LCLS-II-HE project, the DXS team is developing a hard X-ray IXS spectrometer with a resolution of 5 meV at 11.215 keV. The spectrometer relies on a so-called post-sample-collimation scheme, and this high degree of resolution comes with stringent precision and stability requirements. SHADOWOui is used to simulate the setup and analyze the tolerance of 4 optics’ axis (translation, pitch, yaw, roll) and the miscut angle of the channel-cut crystal of the design. The simulation indicates that a 5 meV resolution is achievable by ensuring stringent pitch and vertical translation tolerances. Furthermore, the simulation suggests that a miscut angle of 77 degrees, which necessitates high-quality crystal manufacturing, is optimal.
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Yoshio Ichii, Frank P. O'Dowd, Quentin Yougoubare, Matthew H. Seaberg, Randy A. Whitney, May Ling Ng, Lin Zhang, Robert A. Baker, Luca Rebuffi, and Hasan Yavas "Inelastic x-ray scattering (IXS) spectrometer design studies at LCLS", Proc. SPIE PC13150, Advances in X-Ray/EUV Optics and Components XIX, PC1315007 (4 October 2024); https://doi.org/10.1117/12.3026062
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KEYWORDS
Crystals
Scattering
Spectroscopy
Liquid crystal lasers
Parabolic mirrors
Spectrometer engineering
Collimation
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