Cold and Hot Slumped Glass Optics with interfacing ribs for high angular resolution x-ray telescopes
2016
The Slumped Glass Optics technology, developed at INAF/OAB since a few years, is becoming a competitive solution for
the realization of the future X-ray telescopes with a very large collecting area, e.g. the approved Athena, with more than 2
m 2 effective area at 1 keV and with a high angular resolution (5’’ HEW). The developed technique is based on modular
elements, named X-ray Optical Units (XOUs), made of several layers of thin foils of glass, previously formed by direct hot
slumping in cylindrical configuration and then stacked in a Wolter-I configuration, through interfacing ribs. The latest
advancements in the production of thin glass substrates may allow a great simplification of this process, avoiding the preforming
step via hot slumping. In fact, the strength and the flexibility of glass foils with thickness lower than 0.1 mm allow
their bending up to very small radius of curvature without breaking. In this paper we provide an update of the project
development, reporting on the last results achieved. In particular, we present the results obtained on several prototypes that
have been assembled with different integration approaches.
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