Abstract
We analyze the way of advancing to tender X-rays the short-wavelength bound of the operating range of flat-field grating spectrographs. We design two VLS grating spectrographs with flat fields covering a range of 2 – 13 Å, using spherical (R = 30 and 90 m) VLS gratings mounted at grazing angles of 1.5° and 0.5°. Numerical ray tracing suggests that the width of the spectral image of a point monochromatic source is well within 26 μm, which corresponds to the resolution limit of a CCD detector with a pixel size of 13 μm. For the 1.5° instrument, a sufficiently high reflectivity may be provided by a multilayer coating (e.g., Cr/C) with a period gradient aligned with the grating lines, which eliminates the overlap of different diffraction orders due to the wavelength dispersion of the optical constants.
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Kolesnikov, A.O., Shatokhin, A.N., Vishnyakov, E.A. et al. On the Tender X-Ray Flat-Field Spectrograph with a Concave VLS Grating. J Russ Laser Res 43, 467–475 (2022). https://doi.org/10.1007/s10946-022-10071-0
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DOI: https://doi.org/10.1007/s10946-022-10071-0