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Conference Paper

Broadband EUV/FUV mirror coatings for a solar spectrograph mission

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Teriaca,  Luca
Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society;

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Schühle,  Udo
Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society;

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Citation

Teriaca, L., Feigl, T., & Schühle, U. (2018). Broadband EUV/FUV mirror coatings for a solar spectrograph mission. In J.-W. den Herder, S. Nikzad, & K. Nakazawa (Eds.), Space Telescopes and Instrumentation 2018: Ultraviolet to Gamma Ray (pp. 106992Y-1-106992Y-8). Austin, Texas, USA: SPIE.


Cite as: http://hdl.handle.net/21.11116/0000-0003-9F58-8
Abstract
As it is rich in spectral lines emitted by plasma between 10000 K and 20 MK, the vacuum ultraviolet (VUV - 17 to 200 nm) solar spectrum is extremely valuable for instruments that study the physics of the solar atmosphere. We present multilayer coatings with simultaneous broadband reflectance in the two spectral ranges of 16.9 nm to 21.5 nm and 46.3 nm to 127.5 nm. The coatings are based on Mo/Si multilayers with a thin capping layer of boron carbide (B4C). Samples were produced and their reflectance measured. Their performance in terms of resistance to high temperatures and low micro-roughness was also assessed by measurement. Our study shows that a coating with the characteristics required by next generation spectrometers for studies of the solar atmosphere is feasible.