A diffraction limited dual-band x-ray telescope

Details A diffraction limited dual-band x-ray telescope A diffraction limited dual-band x-ray telescope

Sep 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007spie.6688e...7b&link_type=abstract

Optics for EUV, X-Ray, and Gamma-Ray Astronomy III. Edited by O'Dell, Stephen L.; Pareschi, Giovanni. Proceedings of the SPIE, V

Physics

Optics

1

Scientific paper

We present an innovative X-ray telescope design for diffraction-limited imaging on the mas scale. The long focal distance scheme is based on dispersion-corrected Fresnel lenses made of Li and Be. Annular apertures with an outer diameter of 3.5 m permit simultaneously focused X-rays in two energy bands around 5 and 10 keV. Concentrated to focal spot sizes of ~ 1 mm, a photon throughput of ~ 1400 cm2 keV is achieved in the soft and hard band as well. With its partial spectroscopic capability, the device might be preferably suited for measurements of hardness ratios in X-ray emitting coronae of nearby stars and even disc-to-jet conversion mechanisms within AGN.

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