Grazing-incidence hyperboloid-hyperboloid designs for wide-field x-ray imaging applications

    Authors

    J. E. Harvey; A. Krywonos; P. L. Thompson;T. T. Saha

    Comments

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    Abbreviated Journal Title

    Appl. Optics

    Keywords

    INCIDENCE TELESCOPES; I TELESCOPE; ABERRATIONS; PERFORMANCE; ASTRONOMY; Optics

    Abstract

    The classical Welter type I grazing-incidence x-ray telescope consists of a paraboloidal primary mirror and a confocal hyperboloidal secondary mirror. This design exhibits stigmatic imaging on-axis hut suffers from coma, astigmatism, field curvature, and higher-order aberrations such as oblique spherical aberration. Wolter-Schwarzschild designs have been developed that strictly satisfy the Abbe sine condition and thus exhibit no spherical aberration or coma. However, for wide-field applications such as the solar x-ray imager (SXI), there is little merit in a design with stigmatic imaging on-axis. Instead, one needs to optimize some area-weighted-average measure of resolution over the desired operational field of view. This has traditionally been accomplished by mere despacing of the focal plane of the classical Welter type I telescope. Here we present and evaluate in detail a family of hyperboloid-hyperboloid grazing-incidence x-ray telescope designs whose wide-field performance is much improved over that of an optimally despaced Welter type I and even somewhat improved over that of an optimally despaced Wolter-Schwarzschild design. (C) 2001 Optical Society of America OCIS codes: 340.7440, 340.7470, 220.1000, 220.2740.

    Journal Title

    Applied Optics

    Volume

    40

    Issue/Number

    1

    Publication Date

    1-1-2001

    Document Type

    Article

    Language

    English

    First Page

    136

    Last Page

    144

    WOS Identifier

    WOS:000166202800016

    ISSN

    1559-128X

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