M. D. Ackermann,1 M. J. Collonhttps://orcid.org/0000-0003-2206-2133,1 C. P. Jensen,2 F. E. Christensen,3 M. Krumrey,4 L. Cibik,4 S. Marggraf,4 M. Bavdaz,5 D. Lumb,5 B. Shortt5
1cosine Research B.V. (Netherlands) 2DTU-Space (Denmark) 3DTU-space (Denmark) 4Physikalisch-Technische Bundesanstalt (Germany) 5European Space Research and Technology Ctr. (Netherlands)
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The requirements for the IXO (International X-ray Observatory) telescope are very challenging in respect of angular
resolution and effective area. Within a clear aperture with 1.7 m > R > 0.25 m that is dictated by the spacecraft envelope,
the optics technology must be developed to satisfy simultaneously requirements for effective area of 2.5 m2 at 1.25 keV,
0.65 m2 at 6 keV and 150 cm2 at 30 keV. The reflectivity of the bare mirror substrate materials does not allow these
requirements to be met. As such the IXO baseline design contains a coating layout that varies as a function of mirror
radius and in accordance with the variation in grazing incidence angle. The higher energy photon response is enhanced
through the use of depth-graded multilayer coatings on the inner radii mirror modules. In this paper we report on the first
reflectivity measurements of wedged ribbed silicon pore optics mirror plates coated with a depth graded W/Si multilayer.
The measurements demonstrate that the deposition and performance of the multilayer coatings is compatible with the
SPO production process.
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M. D. Ackermann, M. J. Collon, C. P. Jensen, F. E. Christensen, M. Krumrey, L. Cibik, S. Marggraf, M. Bavdaz, D. Lumb, B. Shortt, "Performance of multilayer coated silicon pore optics," Proc. SPIE 7732, Space Telescopes and Instrumentation 2010: Ultraviolet to Gamma Ray, 77323U (29 July 2010); https://doi.org/10.1117/12.859823