Image quality of a Wolter-1 type X-ray telescope under particular contrast reduction conditions due to diffuse reflection

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Aberration, Diffusion, Grazing Incidence Telescopes, Image Contrast, Reflectance, X Ray Telescopes, Gratings (Spectra), Paraboloid Mirrors, Spectrometers, Surface Roughness Effects

Scientific paper

The principles of this grazing incidence paraboloid-hyperboloid 32 cm mirror telescope intended for astrophysical measurements in the soft x-ray region are described. Dimensioning criteria, choice of materials for optical surfaces (in particular metals), and aberrations were studied. A good polished surface is necessary. Scattering variations with wavelength and glancing angle were investigated and compared with theoretical values. A computer simulation was used to determine the off-axis characteristics of the system and the best position for the detector. The correction of defects and the positioning of a transmission grating in a spectroscope system employing this telescope are described.

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