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Optical Engineering

Grazing incidence Fe-line telescopes using W/B4C multilayers
Author(s): Karsten Dan Joensen; Paul Gorenstein; Finn Erland Christensen; George Gutman; James L. Wood
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Paper Abstract

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-keVwide 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-line multilayer telescope could be built today.

Paper Details

Date Published: 1 January 1995
PDF: 6 pages
Opt. Eng. 34(1) doi: 10.1117/12.188342
Published in: Optical Engineering Volume 34, Issue 1
Show Author Affiliations
Karsten Dan Joensen, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Paul Gorenstein, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Finn Erland Christensen, Danish Space Research Institute (Denmark)
George Gutman, Osmic Inc. (United States)
James L. Wood, Osmic Inc. (United States)

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