A comparison study of mass-area ratio for large size x-ray telescope optics in pore and very thin glass sheets configurations

Details A comparison study of mass-area ratio for large size x-ray telescope optics in pore and very thin glass sheets configurations A comparison study of mass-area ratio for large size x-ray telescope optics in pore and very thin glass sheets configurations

Jul 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006spie.6266e.100b&link_type=abstract

Space Telescopes and Instrumentation II: Ultraviolet to Gamma Ray. Edited by Turner, Martin J. L.; Hasinger, Günther. Proceedi

Physics

Optics

Scientific paper

Dealing with very large size optics for the next generation of X-ray telescopes, like XEUS or ConX/SXT, it's necessary to build segmented mirrors which are assembled in petals because it's impossible to realize them in a monolithic form. The shape of these petals can be square or circular. The main problem is that such optics must have a very low weight compared to past X-ray telescopes, but assuring optimal imaging capabilities. In this paper I compare two different techniques that can achieve this so low weight. One is known as High Precision pore Optics (HPO) and the other one is based on a more classical shaped segments, assembled together, but built with very thin (in the 100-300 μm range) glass sheets that are stiffened with ribs. In this study, the main geometrical differences between the two approaches assumed, is that the first one has a pore size that doesn't change along the optics radius while the second one is based on a constant length. The main purpose of this study is to understand when one concept can be better than the other, depending on a given set of parameters, such as the focal length of the telescope, the filling factor of optic, the thickness of the walls, the radius of the segment, etc. The final goal is to achieve the best optimization of the mass to area ratio.

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