Impact of annealing on performance of X-ray mirror coatings for Athena

P. L. Henriksen; D. D. M. Ferreira; S. Massahi; S. Svendsen; N. C. Gellert; F. E. Christensen; A. S. Jegers; B. Landgraf; A. Thete; M. Collon; E. Handick; L. Cibik; M. Krumrey; C. Gollwitzer; I. Ferreira; B. Shortt; M. Bavdaz

doi:10.1117/12.2594559

23 August 2021 Impact of annealing on performance of X-ray mirror coatings for Athena

P. L. Henriksen, D. D. M. Ferreira, S. Massahi, S. Svendsen, N. C. Gellert, F. E. Christensen, A. S. Jegers, B. Landgraf, A. Thete, M. Collon, E. Handick, L. Cibik, M. Krumrey, C. Gollwitzer, I. Ferreira, B. Shortt, M. Bavdaz

Author Affiliations +

Proceedings Volume 11822, Optics for EUV, X-Ray, and Gamma-Ray Astronomy X; 118220D (2021) https://doi.org/10.1117/12.2594559
Event: SPIE Optical Engineering + Applications, 2021, San Diego, California, United States

Abstract

As part of the manufacturing process of mirror modules for the Athena X-ray telescope, Silicon Pore Optics plates are assembled into mirror module stacks. The plates that form each stack are held together by direct bonding, relying on van der Waals forces and covalent bonds for adhesion. One way to increase the strength of the covalent bonds is through annealing of the mirror stacks. It is of critical importance to the mission to ensure compatibility between the reflective coating and any post-coating processing of the plates. We present our findings of the impact of annealing on the X-ray re ectance of coated mirrors relevant for the Athena mission. These are Ir single layers, as well as Ir/B₄C, Ir/SiC, and Ir/C bilayers. We investigate the effect on the performance of the coatings after annealing at atmospheric pressure and at a low vacuum using X-ray reflectometry. B₄C is found to suffer degradation from annealing under atmospheric conditions but not when annealed in vacuum. All other materials investigated are robust to atmospheric annealing.

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P. L. Henriksen, D. D. M. Ferreira, S. Massahi, S. Svendsen, N. C. Gellert, F. E. Christensen, A. S. Jegers, B. Landgraf, A. Thete, M. Collon, E. Handick, L. Cibik, M. Krumrey, C. Gollwitzer, I. Ferreira, B. Shortt, and M. Bavdaz "Impact of annealing on performance of X-ray mirror coatings for Athena", Proc. SPIE 11822, Optics for EUV, X-Ray, and Gamma-Ray Astronomy X, 118220D (23 August 2021); https://doi.org/10.1117/12.2594559

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