Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978iqwt.rept.....l&link_type=abstract
Unknown
Astronomy and Astrophysics
Astrophysics
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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