22 July 2014 The secondary mirror concept for the European Extremely Large Telescope
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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.
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Michael Mueller, Michael Mueller, Marc Cayrel, Marc Cayrel, Henri Bonnet, Henri Bonnet, Emanuela Ciattaglia, Emanuela Ciattaglia, Michael Esselborn, Michael Esselborn, Franz Koch, Franz Koch, Herve Kurlandczyk, Herve Kurlandczyk, Lorenzo Pettazzi, Lorenzo Pettazzi, Andrew Rakich, Andrew Rakich, Babak Sedghi, Babak Sedghi, "The secondary mirror concept for the European Extremely Large Telescope", Proc. SPIE 9145, Ground-based and Airborne Telescopes V, 91451I (22 July 2014); doi: 10.1117/12.2055109; https://doi.org/10.1117/12.2055109
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