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Proceedings Paper

The secondary mirror concept for the European Extremely Large Telescope
Author(s): Michael Mueller; Marc Cayrel; Henri Bonnet; Emanuela Ciattaglia; Michael Esselborn; Franz Koch; Herve Kurlandczyk; Lorenzo Pettazzi; Andrew Rakich; Babak Sedghi
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Paper Abstract

The E-ELT is an active and adaptive 39-m telescope, with an anastigmat optical solution (5 mirrors including two flats), currently being developed by the European Southern Observatory (ESO). The convex 4-metre-class secondary mirror (M2) is a thin Zerodur meniscus passively supported by an 18 point axial whiffletree. A warping harness system allows to correct low order deformations of the M2 Mirror. Laterally the mirror is supported on 12 points along the periphery by pneumatic jacks. Due to its high optical sensitivity and the telescope gravity deflections, the M2 unit needs to allow repositioning the mirror during observation. Considering its exposed position 30m above the primary, the M2 unit has to provide good wind rejection. The M2 concept is described and major performance characteristics are presented.

Paper Details

Date Published: 22 July 2014
PDF: 13 pages
Proc. SPIE 9145, Ground-based and Airborne Telescopes V, 91451I (22 July 2014); doi: 10.1117/12.2055109
Show Author Affiliations
Michael Mueller, European Southern Observatory (Germany)
Marc Cayrel, European Southern Observatory (Germany)
Henri Bonnet, European Southern Observatory (Germany)
Emanuela Ciattaglia, European Southern Observatory (Germany)
Michael Esselborn, European Southern Observatory (Germany)
Franz Koch, European Southern Observatory (Germany)
Herve Kurlandczyk, European Southern Observatory (Germany)
Lorenzo Pettazzi, European Southern Observatory (Germany)
Andrew Rakich, European Southern Observatory (Germany)
Babak Sedghi, European Southern Observatory (Germany)

Published in SPIE Proceedings Vol. 9145:
Ground-based and Airborne Telescopes V
Larry M. Stepp; Roberto Gilmozzi; Helen J. Hall, Editor(s)

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