Effects of the coating optimization on the field of view for a Wolter x-ray telescope

Details Effects of the coating optimization on the field of view for a Wolter x-ray telescope Effects of the coating optimization on the field of view for a Wolter x-ray telescope

Jul 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010spie.7732e..87c&link_type=abstract

Space Telescopes and Instrumentation 2010: Ultraviolet to Gamma Ray. Edited by Arnaud, Monique; Murray, Stephen S.; Takahashi,

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Multilayer coatings can be used as broad-band reflecting layer in X-ray focusing optics. The effective area over the field of view is determined by the energetic and angular dependence of the coating reflectivity, with a different behavior in dependence of the coating structure, that can be designed in order to enhance the effective area. Often the best design is selected to maximize the on-axis effective area, but this does not ensure the performances off-axis, where the most of the detector area is allocated. We demonstrate the possibility of optimizing the coating over the whole field of view by means of a new method, that does not require the use of ray-tracing procedures, being based on the computation of a simple analytical expression computed over a limited number of points. Our method is used to optimize a multilayer structure over the field of view. The effectiveness of the method is tested by comparison with ray-tracing results. The performances of the multilayer structure resulting from the optimization are then compared with a not optimized broad-band multilayer and with a multilayer optimized for on-axis effective area.

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