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Matches in SemOpenAlex for { <https://semopenalex.org/work/W4229074749> ?p ?o ?g. }

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• W4229074749 abstract "A real-time and accurate characterization of the X-ray beam size is essential to enable a large variety of different experiments at free-electron laser facilities. Typically, ablative imprints are employed to determine shape and size of µm-focused X-ray beams. The high accuracy of this state-of-the-art method comes at the expense of the time required to perform an ex-situ image analysis. In contrast, diffraction at a curved grating with suitably varying period and orientation forms a magnified image of the X-ray beam, which can be recorded by a 2D pixelated detector providing beam size and pointing jitter in real time. In this manuscript, we compare results obtained with both techniques, address their advantages and limitations, and demonstrate their excellent agreement. We present an extensive characterization of the FEL beam focused to ≈1 µm by two Kirkpatrick-Baez (KB) mirrors, along with optical metrology slope profiles demonstrating their exceptionally high quality. This work provides a systematic and comprehensive study of the accuracy provided by curved gratings in real-time imaging of X-ray beams at a free-electron laser facility. It is applied here to soft X-rays and can be extended to the hard X-ray range. Furthermore, curved gratings, in combination with a suitable detector, can provide spatial properties of µm-focused X-ray beams at MHz repetition rate." @default.
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• W4229074749 date "2022-05-26" @default.
• W4229074749 modified "2023-10-17" @default.
• W4229074749 title "Real-time spatial characterization of micrometer-sized X-ray free-electron laser beams focused by bendable mirrors" @default.
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• W4229074749 doi "https://doi.org/10.1364/oe.455948" @default.
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