Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995opten..34..283j&link_type=abstract
Optical Engineering 34(01), 283-288, Brian J. Thompson; Ed.
Astronomy and Astrophysics
Astrophysics
1
Scientific paper
The loss of throughput observed at higher energies for traditional grazing-incidence x-ray telescopes coated with high-Z elements can be partly countered by employing multilayers on the outermost reflectors. Using 8-keV reflectivity data from a periodic W/B4C multilayer, the expected performance of intermediate-sized telescopes of (1) the nested Kirkpatrick-Baez geometry and (2) the conical approximation to a nested Wolter-I geometry is computed. Depending on the multilayer design, the throughput was increased by a factor of 3 to 5 in a 1.5-keV-wide band, or by 30% to 100% in a 3-keV-wide band. This gain is obtained at the expense of a 20% to 30% loss of throughput over the 2- to 4-keV band. These designs lend themselves well to astrophysics missions, such as spectroscopy of the H- and He-like iron emission lines (6.4 to 7.1 keV). The technology for multilayer coating, mounting, and configuring of the flat reflectors required by the Kirkpatrick-Baez telescope exists, so that an Fe-like multilayer telescope could be built today.
Christensen Finn E.
Gorenstein Paul
Gutman George
Joensen Karsten D.
Wood James L.
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