Aberrations of a facet-type transmission grating for cosmic X-ray and XUV spectroscopy

Astronomy and Astrophysics – Astronomy

Scientific paper

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Aberration, Cosmic X Rays, Far Ultraviolet Radiation, Gratings (Spectra), Ultraviolet Spectroscopy, X Ray Spectroscopy, Ray Tracing, Satellite-Borne Instruments, Spaceborne Astronomy, Spacelab Payloads, Spectral Resolution, X Ray Telescopes

Scientific paper

Fermat's principle is used to examine the aberrations of various types of curved constant-period transmission gratings. It is shown that optimal performance is achieved with a grating which is assembled from individual constant-period facets which form a nonclosed surface and which operates sufficiently free of third-order aberrations, with application to X-ray astronomy. For this geometry, primary coma and astigmatism are proportional to the facet size and, hence, may be adapted to the angular resolution of large Wolter type I telescopes typical of those in construction or under design for satellite and Spacelab applications.

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