29 July 2010 Performance of multilayer coated silicon pore optics
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Abstract
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.
© (2010) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
M. D. Ackermann, M. D. Ackermann, M. J. Collon, M. J. Collon, C. P. Jensen, C. P. Jensen, F. E. Christensen, F. E. Christensen, M. Krumrey, M. Krumrey, L. Cibik, L. Cibik, S. Marggraf, S. Marggraf, M. Bavdaz, M. Bavdaz, D. Lumb, D. Lumb, B. Shortt, 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); doi: 10.1117/12.859823; https://doi.org/10.1117/12.859823
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