Coating process parameter influence on thin films for the ATHENA x-ray optics

S. Massahi, D. D. M. Ferreira, F. E. Christensen, S. Svendsen, N. Gellert, A. 'S Jegers, M. Collon, B. Landgraf, A. Thete, I. Ferreira, M. Bavdaz, B. Shortt, W. Schönberger, A. Langer, M. Krumrey, C. Gollwitzer, E. Handick

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Abstract

The thin film deposition technology for fabrication of the mirror optics for the Advanced Telescope for HighEnergy Astrophysics (ATHENA) has been established. Numerous coating process parameters impact the quality of the thin films. Defining a margin within the coating process parameter space, where the deposited thin film performs similar in X-ray reflectivity is key to avoid unforeseen risks within the coating process for the ATHENA flight optics production. In this work, we investigate the coating process parameter influence on the thin film properties with a focus on micro roughness, deposition rate and residual film stress when deposited under various process conditions. The thin films were produced by varying the following three coating process parameters: discharge power, discharge voltage and working gas pressure. The thin films were characterized using X–ray reflectometry at 3.4–10.0 keV. A main result of this work is that the residual stress of single layer iridium and boron carbide films can be reduced by a factor of approximately two, by increasing the working gas pressure while maintaining a high film quality.
Original languageEnglish
Title of host publicationProceedings of SPIE : Space Telescopes and Instrumentation 2022: Ultraviolet to Gamma Ray
EditorsJan-Willem A. den Herder, Shouleh Nikzad, Kazuhiro Nakazawa
Number of pages11
Volume12181
PublisherSPIE - International Society for Optical Engineering
Publication date2022
Article number121814F
DOIs
Publication statusPublished - 2022
EventSpace Telescopes and Instrumentation 2022: Ultraviolet to Gamma Ray - Montréal, Canada
Duration: 17 Jul 202222 Jul 2022
https://spie.org/as/conferencedetails/space-telescopes-and-instrumentation-uv-to-gamma?SSO=1

Conference

ConferenceSpace Telescopes and Instrumentation 2022: Ultraviolet to Gamma Ray
Country/TerritoryCanada
CityMontréal
Period17/07/202222/07/2022
Internet address
SeriesProceedings of SPIE - The International Society for Optical Engineering
ISSN0277-786X

Keywords

  • X–ray optics
  • DC magnetron sputtering
  • Silicon Pore Optics
  • ATHENA
  • Working gas pressure
  • Discharge power
  • Discharge voltage
  • Residual film stress

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