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Proceedings Paper

Development of Ni-based multilayers for future focusing soft gamma ray telescopes
Author(s): David A. Girou; Sonny Massahi; Erlend K. Sleire; Anders C. Jakobsen; Finn E. Christensen
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Paper Abstract

Ni-based multilayers are a possible solution to extend the upper energy range of hard X-ray focusing telescopes currently limited at ≈79:4 keV by the Pt-K absorption edge. In this study 10 bilayers multilayers with a constant bilayer thickness were coated with the DC magnetron sputtering facility at DTU Space, characterized at 8 keV using X-ray reectometry and fitted using the IMD software. Ni/C multilayers were found to have a mean interface roughness ≈ 1:5 times lower than Ni/B4C multilayers. Reactive sputtering with ≈ 76% of Ar and ≈ 24% of N2 reduced the mean interface roughness by a factor of ≈ 1:7. It also increased the coating rate of C by a factor of ≈ 3:1 and lead to a coating process going ≈ 1:6 times faster. Honeycomb collimation proved to limit the increase in mean interface roughness when the bilayer thickness increases at the price of a coating process going ≈ 1:9 times longer than with separator plates. Finally a Ni/C 150 bilayers depth-graded mutilayer was coated with reactive sputtering and honeycomb collimation and then characterized from 10 keV to 150 keV. It showed 10% reectance up to 85 keV.

Paper Details

Date Published: 4 September 2015
PDF: 11 pages
Proc. SPIE 9603, Optics for EUV, X-Ray, and Gamma-Ray Astronomy VII, 96031D (4 September 2015); doi: 10.1117/12.2186814
Show Author Affiliations
David A. Girou, DTU Space (Denmark)
Sonny Massahi, DTU Space (Denmark)
Erlend K. Sleire, DTU Space (Denmark)
Anders C. Jakobsen, DTU Space (Denmark)
Finn E. Christensen, DTU Space (Denmark)


Published in SPIE Proceedings Vol. 9603:
Optics for EUV, X-Ray, and Gamma-Ray Astronomy VII
Stephen L. O'Dell; Giovanni Pareschi, Editor(s)

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