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1 August 2010 Effects of the coating optimization on the field of view for a Wolter x-ray telescope
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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.
© (2010) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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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