Large-scale diffractive X-ray telescopes

Details Large-scale diffractive X-ray telescopes Large-scale diffractive X-ray telescopes

Apr 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006exa....21..101b&link_type=abstract

Experimental Astronomy, Volume 21, Issue 2, pp.101-123

Astronomy and Astrophysics

Astronomy

2

Instrumentation: High Angular Resolution, Techniques: Spectroscopic Telescopes

Scientific paper

Capabilities of large-scale diffractive X-ray telescopes are discussed. Based on purely transmissive optics, an angular resolution of at least 10-3 arcsec will be achieved using detection techniques with spectral selectivities in the sub-eV range for short focal distances of few 102 km. We use stepped versions of Fresnel apertures made of plastic foils, divided into optically independent segments by two alternative schemes. It is shown that point source sensitivities near 103 cm2 keV require lens diameters up to 30 m. Like monochromatic objectives, properly shaped dual- or multiband telescopes may be tuned over several keV. Such configurations are made of partial Fresnel lenses with coinciding focal distances and similar spot sizes and compete well with single-band analogues.

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