Grazing incidence Fe-line telescopes using W/B4C multilayers

Details Grazing incidence Fe-line telescopes using W/B4C multilayers Grazing incidence Fe-line telescopes using W/B4C multilayers

Feb 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994spie.2011..373j&link_type=abstract

Proc. SPIE Vol. 2011, p. 373-380, Multilayer and Grazing Incidence X-Ray/EUV Optics II, Richard B. Hoover; Arthur B. Walker; Eds

Physics

Optics

Scientific paper

Traditional high-Z coated X-ray telescopes for the >= 1 keV range all have a loss of throughput with higher energies, owing to the inverse proportionality between the critical angle and energy. We have shown that this can, to some degree, be countered by employing multilayers on the outermost reflectors. A W/B4C multilayer has been fabricated and its 8 keV X-ray reflectivity measured and modeled, yielding an interface-roughness of 3.6 angstroms. This measurement and the resulting model-fit form the basis for computing the performance of `AXAF-S'-sized conical and Kirkpatrick-Baez telescopes. Depending on the specifics of the design, a factor 3 - 5 increased throughput was obtained in a narrow energy band, or a 30 - 100% increase in a wider-band. This throughput ia gained at the expense of the throughput at 2 - 4 keV, which is reduced by 20 - 30%.

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