Optimizations of Pt/SiC and W/Si multilayers for the Nuclear Spectroscopic Telescope Array

K. K. Madsen, F. A. Harrison, P. H. Mao, Finn Erland Christensen, Carsten P. Cooper-Jensen, Nicolai Brejnholt, J. Koglin, M. J. Pivovaroff

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    The Nuclear Spectroscopic Telescope Array, NuSTAR, is a NASA funded Small Explorer Mission, SMEX, scheduled for launch in mid 2011. The spacecraft will fly two co-aligned conical approximation Wolter-I optics with a focal length of 10 meters. The mirrors will be deposited with Pt/SiC and W/Si multilayers to provide a broad band reflectivity from 6 keV up to 78.4 keV. To optimize the mirror coating we use a Figure of Merit procedure developed for gazing incidence optics, which averages the effective area over the energy range, and combines an energy weighting function with an angular weighting function to control the shape of the desired effective area. The NuSTAR multilayers are depth graded with a power-law, di = a/(b + i)c, and we optimize over the total number of bi-layers, N, c, and the maximum bi-layer thickness, dmax. The result is a 10 mirror group design optimized for a flat even energy response both on and off-axis.
    Original languageEnglish
    JournalProceedings of SPIE, the International Society for Optical Engineering
    Volume7437
    Issue number743716
    ISSN0277-786X
    DOIs
    Publication statusPublished - 2009

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