Properties of a transmission grating behind a grazing incidence telescope for cosmic x-ray spectroscopy.
Third-order aberrations are discussed of a transmission grating positioned behind a Wolter type I telescope, using Fermat's principle. We describe the conditions required to obtain a coma-free grating. The performance of a grating spectrometer for cosmic x-ray spectroscopy is discussed in some detail.
Beuermann
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Lenzen
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Bräuninger
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