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

V. Cotroneo; G. Pareschi; D. Spiga; G. Tagliaferri

doi:10.1117/12.857075

1 August 2010 Effects of the coating optimization on the field of view for a Wolter x-ray telescope

V. Cotroneo, G. Pareschi, D. Spiga, G. Tagliaferri

Proceedings Volume 7732, Space Telescopes and Instrumentation 2010: Ultraviolet to Gamma Ray; 77322P (2010) https://doi.org/10.1117/12.857075
Event: SPIE Astronomical Telescopes + Instrumentation, 2010, San Diego, California, United States

Abstract

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.

Citation Download Citation

V. Cotroneo, G. Pareschi, D. Spiga, and G. Tagliaferri "Effects of the coating optimization on the field of view for a Wolter x-ray telescope", Proc. SPIE 7732, Space Telescopes and Instrumentation 2010: Ultraviolet to Gamma Ray, 77322P (1 August 2010); https://doi.org/10.1117/12.857075

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