25 October 2016 How to specify super-smooth mirrors: simulation studies on nano-focusing and wavefront preserving x-ray mirrors for next-generation light sources
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Abstract
The advent of high-brilliance synchrotron radiation sources with low emittance and high degree of coherence has urged the development of super-smooth x-ray mirrors, which have sub-nanometer height errors and sub-50-nrad slope errors. To ensure the optical performance and avoid procuring significantly more expensive mirrors than necessary, knowledge of the mirror surface power spectral density (PSD) function is required over a wide spatial frequency range. In addition, a better understanding of the diffraction effects of different spatial frequencies is required to guide the specification of the mirror in the beamline design phase. In this work, two typical x-ray beam focusing conditions for the proposed APS upgrade are studied: the diffraction limited focusing and the demagnification dominated focusing. The effects of surface errors are studied using both the method described by Church and Takacs1 and numerical simulations with HYBRID2. Using this information, we show how the mirror specification depends on the mirror PSD.
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Xianbo Shi, Xianbo Shi, Lahsen Assoufid, Lahsen Assoufid, Ruben Reininger, Ruben Reininger, } "How to specify super-smooth mirrors: simulation studies on nano-focusing and wavefront preserving x-ray mirrors for next-generation light sources", Proc. SPIE 9687, 8th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Subnanometer Accuracy Measurement for Synchrotron Optics and X-Ray Optics, 968703 (25 October 2016); doi: 10.1117/12.2241139; https://doi.org/10.1117/12.2241139
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