1 January 1995 Grazing incidence Fe-line telescopes using W/B4C multilayers
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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.
Karsten Dan Joensen, Karsten Dan Joensen, Paul Gorenstein, Paul Gorenstein, Finn Erland Christensen, Finn Erland Christensen, George Gutman, George Gutman, James L. Wood, James L. Wood, } "Grazing incidence Fe-line telescopes using W/B4C multilayers," Optical Engineering 34(1), (1 January 1995). https://doi.org/10.1117/12.188342 . Submission:

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