Characterisation of iridium and low-density bilayer coatings for the Athena optics

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

doi:10.1117/12.2629976

Characterisation of iridium and low-density bilayer coatings for the Athena optics

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

^*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review

97 Downloads (Pure)

Abstract

The future Athena observatory will feature optics with unprecedented collecting area enabled by silicon pore optics technology. In order to achieve the telescope effective area requirements at 1 keV and 7 keV, thin film coatings of iridium with a low-density overcoat are deposited onto the mirror substrates. Assembling the coated silicon pore optics plates into mirror modules for the Athena optics requires wet chemical processing and thermal annealing. While iridium appears to be compatible with the post-coating processes, previous studies have shown degradation of the low-density material. The overcoat layer is particularly critical for the low-energy telescope performance, so several candidate materials (boron carbide, silicon carbide and carbon) have been studied to identify a compatible thin film design. We present the characterisation of x-ray mirror performance using x-ray reflectometry, as well as the measurements of residual film stress with stylus profilometry. Furthermore, we evaluate the effects of post-coating treatment in order to recommend the most suitable overcoat material for the telescope.

Original language	English
Title of host publication	Proceedings of SPIE : Space Telescopes and Instrumentation 2022: Ultraviolet to Gamma Ray
Editors	Jan-Willem A. den Herder, Shouleh Nikzad, Kazuhiro Nakazawa
Publisher	SPIE - International Society for Optical Engineering
Publication date	2022
Article number	121810Z
ISBN (Electronic)	9781510653436
DOIs	https://doi.org/10.1117/12.2629976
Publication status	Published - 2022
Event	Space Telescopes and Instrumentation 2022: Ultraviolet to Gamma Ray - Montréal, Canada Duration: 17 Jul 2022 → 22 Jul 2022 https://spie.org/as/conferencedetails/space-telescopes-and-instrumentation-uv-to-gamma?SSO=1

Conference

Conference	Space Telescopes and Instrumentation 2022: Ultraviolet to Gamma Ray
Country/Territory	Canada
City	Montréal
Period	17/07/2022 → 22/07/2022
Internet address	https://spie.org/as/conferencedetails/space-telescopes-and-instrumentation-uv-to-gamma?SSO=1

Series	Proceedings of SPIE - The International Society for Optical Engineering
Volume	12181
ISSN	0277-786X

Keywords

Athena
Bilayer
Boron carbide
Carbon
Iridium
Silicon carbide
Silicon Pore Optics
Thin film
X-ray optics

Access to Document

10.1117/12.2629976

FulltextFinal published version, 920 KB

OpenUrl availability

Full text

Cite this

Svendsen, S., Massahi, S., Ferreira, D. D., Gellert, N. C., 'S Jegers, A., Christensen, F. E., Thete, A., Landgraf, B., Collon, M., Handick, E., Skroblin, D., Cibik, L., Gollwitzer, C., Krumrey, M., Ferreira, I., Shortt, B., & Bavdaz, M. (2022). Characterisation of iridium and low-density bilayer coatings for the Athena optics. In J.-W. A. den Herder, S. Nikzad, & K. Nakazawa (Eds.), Proceedings of SPIE: Space Telescopes and Instrumentation 2022: Ultraviolet to Gamma Ray Article 121810Z SPIE - International Society for Optical Engineering. https://doi.org/10.1117/12.2629976

Svendsen, S. ; Massahi, S. ; Ferreira, D. D. et al. / Characterisation of iridium and low-density bilayer coatings for the Athena optics. Proceedings of SPIE: Space Telescopes and Instrumentation 2022: Ultraviolet to Gamma Ray. editor / Jan-Willem A. den Herder ; Shouleh Nikzad ; Kazuhiro Nakazawa. SPIE - International Society for Optical Engineering, 2022. (Proceedings of SPIE - The International Society for Optical Engineering, Vol. 12181).

@inproceedings{d9901d466d634790ad08c3cd9a6cfb03,

title = "Characterisation of iridium and low-density bilayer coatings for the Athena optics",

abstract = "The future Athena observatory will feature optics with unprecedented collecting area enabled by silicon pore optics technology. In order to achieve the telescope effective area requirements at 1 keV and 7 keV, thin film coatings of iridium with a low-density overcoat are deposited onto the mirror substrates. Assembling the coated silicon pore optics plates into mirror modules for the Athena optics requires wet chemical processing and thermal annealing. While iridium appears to be compatible with the post-coating processes, previous studies have shown degradation of the low-density material. The overcoat layer is particularly critical for the low-energy telescope performance, so several candidate materials (boron carbide, silicon carbide and carbon) have been studied to identify a compatible thin film design. We present the characterisation of x-ray mirror performance using x-ray reflectometry, as well as the measurements of residual film stress with stylus profilometry. Furthermore, we evaluate the effects of post-coating treatment in order to recommend the most suitable overcoat material for the telescope.",

keywords = "Athena, Bilayer, Boron carbide, Carbon, Iridium, Silicon carbide, Silicon Pore Optics, Thin film, X-ray optics",

author = "S. Svendsen and S. Massahi and Ferreira, {D. D.} and Gellert, {N. C.} and {'S Jegers}, A. and Christensen, {F. E.} and A. Thete and B. Landgraf and M. Collon and E. Handick and D. Skroblin and L. Cibik and C. Gollwitzer and M. Krumrey and I. Ferreira and B. Shortt and M. Bavdaz",

note = "Publisher Copyright: {\textcopyright} COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.; Space Telescopes and Instrumentation 2022: Ultraviolet to Gamma Ray ; Conference date: 17-07-2022 Through 22-07-2022",

year = "2022",

doi = "10.1117/12.2629976",

language = "English",

series = "Proceedings of SPIE - The International Society for Optical Engineering",

publisher = "SPIE - International Society for Optical Engineering",

editor = "{den Herder}, {Jan-Willem A.} and Shouleh Nikzad and Kazuhiro Nakazawa",

booktitle = "Proceedings of SPIE",

url = "https://spie.org/as/conferencedetails/space-telescopes-and-instrumentation-uv-to-gamma?SSO=1",

}

Svendsen, S , Massahi, S , Ferreira, DD , Gellert, NC , 'S Jegers, A , Christensen, FE, Thete, A, Landgraf, B, Collon, M, Handick, E, Skroblin, D, Cibik, L, Gollwitzer, C, Krumrey, M, Ferreira, I, Shortt, B & Bavdaz, M 2022, Characterisation of iridium and low-density bilayer coatings for the Athena optics. in J-WA den Herder, S Nikzad & K Nakazawa (eds), Proceedings of SPIE: Space Telescopes and Instrumentation 2022: Ultraviolet to Gamma Ray., 121810Z, SPIE - International Society for Optical Engineering, Proceedings of SPIE - The International Society for Optical Engineering, vol. 12181, Space Telescopes and Instrumentation 2022: Ultraviolet to Gamma Ray, Montréal, Quebec, Canada, 17/07/2022. https://doi.org/10.1117/12.2629976

Characterisation of iridium and low-density bilayer coatings for the Athena optics. / Svendsen, S.; Massahi, S.; Ferreira, D. D. et al.
Proceedings of SPIE: Space Telescopes and Instrumentation 2022: Ultraviolet to Gamma Ray. ed. / Jan-Willem A. den Herder; Shouleh Nikzad; Kazuhiro Nakazawa. SPIE - International Society for Optical Engineering, 2022. 121810Z (Proceedings of SPIE - The International Society for Optical Engineering, Vol. 12181).

Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review

TY - GEN

T1 - Characterisation of iridium and low-density bilayer coatings for the Athena optics

AU - Svendsen, S.

AU - Massahi, S.

AU - Ferreira, D. D.

AU - Gellert, N. C.

AU - 'S Jegers, A.

AU - Christensen, F. E.

AU - Thete, A.

AU - Landgraf, B.

AU - Collon, M.

AU - Handick, E.

AU - Skroblin, D.

AU - Cibik, L.

AU - Gollwitzer, C.

AU - Krumrey, M.

AU - Ferreira, I.

AU - Shortt, B.

AU - Bavdaz, M.

PY - 2022

Y1 - 2022

N2 - The future Athena observatory will feature optics with unprecedented collecting area enabled by silicon pore optics technology. In order to achieve the telescope effective area requirements at 1 keV and 7 keV, thin film coatings of iridium with a low-density overcoat are deposited onto the mirror substrates. Assembling the coated silicon pore optics plates into mirror modules for the Athena optics requires wet chemical processing and thermal annealing. While iridium appears to be compatible with the post-coating processes, previous studies have shown degradation of the low-density material. The overcoat layer is particularly critical for the low-energy telescope performance, so several candidate materials (boron carbide, silicon carbide and carbon) have been studied to identify a compatible thin film design. We present the characterisation of x-ray mirror performance using x-ray reflectometry, as well as the measurements of residual film stress with stylus profilometry. Furthermore, we evaluate the effects of post-coating treatment in order to recommend the most suitable overcoat material for the telescope.

AB - The future Athena observatory will feature optics with unprecedented collecting area enabled by silicon pore optics technology. In order to achieve the telescope effective area requirements at 1 keV and 7 keV, thin film coatings of iridium with a low-density overcoat are deposited onto the mirror substrates. Assembling the coated silicon pore optics plates into mirror modules for the Athena optics requires wet chemical processing and thermal annealing. While iridium appears to be compatible with the post-coating processes, previous studies have shown degradation of the low-density material. The overcoat layer is particularly critical for the low-energy telescope performance, so several candidate materials (boron carbide, silicon carbide and carbon) have been studied to identify a compatible thin film design. We present the characterisation of x-ray mirror performance using x-ray reflectometry, as well as the measurements of residual film stress with stylus profilometry. Furthermore, we evaluate the effects of post-coating treatment in order to recommend the most suitable overcoat material for the telescope.

KW - Athena

KW - Bilayer

KW - Boron carbide

KW - Carbon

KW - Iridium

KW - Silicon carbide

KW - Silicon Pore Optics

KW - Thin film

KW - X-ray optics

U2 - 10.1117/12.2629976

DO - 10.1117/12.2629976

M3 - Article in proceedings

AN - SCOPUS:85140440190

T3 - Proceedings of SPIE - The International Society for Optical Engineering

BT - Proceedings of SPIE

A2 - den Herder, Jan-Willem A.

A2 - Nikzad, Shouleh

A2 - Nakazawa, Kazuhiro

PB - SPIE - International Society for Optical Engineering

T2 - Space Telescopes and Instrumentation 2022: Ultraviolet to Gamma Ray

Y2 - 17 July 2022 through 22 July 2022

ER -

Svendsen S , Massahi S , Ferreira DD , Gellert NC , 'S Jegers A , Christensen FE et al. Characterisation of iridium and low-density bilayer coatings for the Athena optics. In den Herder JWA, Nikzad S, Nakazawa K, editors, Proceedings of SPIE: Space Telescopes and Instrumentation 2022: Ultraviolet to Gamma Ray. SPIE - International Society for Optical Engineering. 2022. 121810Z. (Proceedings of SPIE - The International Society for Optical Engineering, Vol. 12181). doi: 10.1117/12.2629976

Characterisation of iridium and low-density bilayer coatings for the Athena optics

Abstract

Conference

Keywords

Access to Document

OpenUrl availability

Fingerprint

Cite this