Optimization of multilayer coatings for future high-energy focusing telescopes

N. C. Gellert; S. Massahi; D. D. M. Ferreira; F. E. Christensen; S. Svendsen; A. 'S Jegers; K. K. Madsen

doi:10.1117/12.2629366

31 August 2022 Optimization of multilayer coatings for future high-energy focusing telescopes

N. C. Gellert, S. Massahi, D. D. M. Ferreira, F. E. Christensen, S. Svendsen, A. 'S Jegers, K. K. Madsen

Proceedings Volume 12181, Space Telescopes and Instrumentation 2022: Ultraviolet to Gamma Ray; 121814K (2022) https://doi.org/10.1117/12.2629366
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Conference Poster

Abstract

Nanometer-thin multilayer coatings can enable high performance of focusing X-ray telescopes to energies up to 200 keV and beyond. In this paper we discuss the multilayer parameters and their limitations necessary for the reflection of hard X-ray photons. We present several multilayer coating designs that are optimized with a Differential Evolution algorithm to perform a stochastic global search of the multi-parametric model space. The coating designs are based on the new specifications of the HEX-P mission geometry, optimizing within the energy range 60 keV - 200 keV. We compare the simulated reflectivity spectra of Si/Ni, Si/Pt and Si/W, at different incident angles. We find the effective upper limit of bilayers in the multilayer stack, beyond which reflectivity will not be increased. We discuss a hybrid multilayer coating design, consisting of either a Si/Pt or Si/W multilayer with a top Si/Ni multilayer.

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N. C. Gellert, S. Massahi, D. D. M. Ferreira, F. E. Christensen, S. Svendsen, A. 'S Jegers, and K. K. Madsen "Optimization of multilayer coatings for future high-energy focusing telescopes", Proc. SPIE 12181, Space Telescopes and Instrumentation 2022: Ultraviolet to Gamma Ray, 121814K (31 August 2022); https://doi.org/10.1117/12.2629366

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