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Supermirror hard-x-ray telescope.

K Yamashita, P J Serlemitsos, J Tueller

    Applied Optics
    |February 28, 2008
    PubMed
    Summary
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    This study demonstrates a hard x-ray telescope using a supermirror multilayer for imaging up to 40 keV. The telescope achieved 2.4 arc min angular resolution, showcasing practical applications in hard x-ray astronomy.

    Area of Science:

    • Astrophysics
    • Materials Science
    • Optics

    Background:

    • Hard x-ray astronomy requires advanced imaging capabilities.
    • Grazing incidence optics with enhanced reflectivity are crucial for detecting high-energy photons.
    • Supermirror multilayers offer improved performance over traditional optics.

    Purpose of the Study:

    • To demonstrate the practical application of a grazing x-ray telescope for hard x-ray imaging.
    • To utilize depth-graded d-spacing multilayer (supermirror) technology for enhanced reflectivity.
    • To achieve high angular resolution in hard x-ray observations.

    Main Methods:

    • Fabrication of platinum-carbon multilayers with varying periodic lengths (3-5 nm) using magnetron dc sputtering.
    • Assembly of 20 mirror shells into a nested grazing-incidence telescope.

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  • Imaging with a position-sensitive cadmium zinc telluride (CdZnTe) solid-state detector.

    • Main Results:

    • Achieved reflectivity of 25%-30% in the 24-36 keV energy range at a 0.3-degree grazing angle.
    • Demonstrated hard x-ray imaging capability up to 40 keV.
    • Obtained an angular resolution of 2.4 arc min (half-power diameter).

    Conclusions:

    • The developed supermirror-based grazing x-ray telescope is effective for hard x-ray imaging.
    • The technology enables practical astronomical observations in the hard x-ray spectrum.
    • The achieved angular resolution is suitable for detailed astrophysical studies.