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Proceedings Paper

Cost-optimized methods extending the solution space of lightweight spaceborne monolithic ZERODUR(R) mirrors to larger sizes
Author(s): Antoine Leys; Tony Hull; Thomas Westerhoff
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Paper Abstract

We address the problem that larger spaceborne mirrors require greater sectional thickness to achieve a sufficient first eigen frequency that is resilient to launch loads, and to be stable during optical telescope assembly integration and test, this added thickness results in unacceptable added mass if we simply scale up solutions for smaller mirrors. Special features, like cathedral ribs, arch, chamfers, and back-side following the contour of the mirror face have been considered for these studies. For computational efficiency, we have conducted detailed analysis on various configurations of a 800 mm hexagonal segment and of a 1.2-m mirror, in a manner that they can be constrained by manufacturing parameters as would be a 4-m mirror. Furthermore each model considered also has been constrained by cost-effective machining practice as defined in the SCHOTT Mainz factory. Analysis on variants of this 1.2-m mirror has shown a favorable configuration. We have then scaled this optimal configuration to 4-m aperture. We discuss resulting parameters of costoptimized 4-m mirrors. We also discuss the advantages and disadvantages this analysis reveals of going to cathedral rib architecture on 1-m class mirror substrates.

Paper Details

Date Published: 2 September 2015
PDF: 12 pages
Proc. SPIE 9573, Optomechanical Engineering 2015, 95730E (2 September 2015); doi: 10.1117/12.2187099
Show Author Affiliations
Antoine Leys, Schott AG (Germany)
Tony Hull, The Univ. of New Mexico (United States)
Thomas Westerhoff, Schott AG (Germany)

Published in SPIE Proceedings Vol. 9573:
Optomechanical Engineering 2015
Alson E. Hatheway, Editor(s)

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