Development of Ni-based multilayers for future focusing soft gamma ray telescopes

David A. Girou, Sonny Massahi, Erlend K. Sleire, Anders C. Jakobsen, Finn E. Christensen

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    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
    Original languageEnglish
    Title of host publicationProceedings of SPIE
    PublisherSPIE - International Society for Optical Engineering
    Publication date2015
    Publication statusPublished - 2015
    EventOptics for EUV, X-Ray, and Gamma-Ray Astronomy VII: Conference 9603 - San Diego Convention Center, San Diego, United States
    Duration: 10 Aug 201513 Aug 2015


    ConferenceOptics for EUV, X-Ray, and Gamma-Ray Astronomy VII
    LocationSan Diego Convention Center
    Country/TerritoryUnited States
    CitySan Diego
    SeriesProceedings of SPIE - The International Society for Optical Engineering

    Bibliographical note

    Copyright 2015 Society of Photo Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic electronic or print reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.


    • Nickel
    • Multilayer
    • Gamma-ray
    • Telescope
    • Depth-graded
    • Reactive sputtering
    • Collimation
    • Coating
    • Magnetron sputtering


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