Performance and time stability of Ir/SiC X-ray mirror coatings for ATHENA

S. Svendsen, S. Massahi, D. D. M. Ferreira, F. E. Christensen, A. Jafari, P. L. Henriksen, M. Collon, B. Landgraf, D. Girou, M. Krumrey, L. Cibik, A. Schubert, E. Handick, B. Shortt

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    Abstract

    Excellent X-ray reflective mirror coatings are key in order to meet the performance requirements of the ATHENA telescope. The baseline coating design of ATHENA was initially formed by Ir/B4C but extensive studies have identified critical issues with the stability of the B4C top layer which shows strong evolution over time and appears incompatible with the industrialization processes required for the production of mirror modules. Motivated by the need for a compatible top layer material to improve the telescope performance at low energies and based on simulated performance, a SiC top layer has been selected as the best substitute to B4C. We report the latest development of Ir/SiC bilayer coatings optimized for ATHENA and the characterization of coating performance and stability.
    Original languageEnglish
    Title of host publicationProceedings of SPIE 11119, Optics for EUV, X-Ray, and Gamma-Ray Astronomy IX
    EditorsStephen L. O'Dell, Giovanni Pareschi
    Volume11119
    PublisherSPIE - International Society for Optical Engineering
    Publication date2019
    Pages107 - 116
    DOIs
    Publication statusPublished - 2019
    Event2019 SPIE OPTICS + PHOTONICS - San Diego, United States
    Duration: 11 Aug 201915 Aug 2019

    Conference

    Conference2019 SPIE OPTICS + PHOTONICS
    Country/TerritoryUnited States
    CitySan Diego
    Period11/08/201915/08/2019
    SeriesProceedings of SPIE - The International Society for Optical Engineering
    ISSN0277-786X

    Keywords

    • ATHENA
    • X-ray mirrors
    • Silicon Pore Optics
    • X-ray optics
    • Ir/SiC
    • SiC
    • Coating stability
    • Thin film characterization

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