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Proceedings Paper

Field stabilization (tip/tilt control) of E-ELT
Author(s): B. Sedghi; M. Müller; H. Bonnet; M. Dimmler; B. Bauvir
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Paper Abstract

The image motion (tip/tilt) of the telescope is dominated by two types of perturbations: a) atmospheric b) wind load. The wind load effect on E-ELT can be an order of magnitude higher than the atmospheric effect. Part of the image motion due to the wind load on the telescope structure is corrected by the main axis control system (mainly large amplitude, low frequency errors). The residual tip/tilt is reduced by M5 and M4 mirror units. M5 with its large stroke and relative low bandwidth (higher than main axes) corrects for large amplitude and low frequency part of the image motion and M4 unit takes the higher frequency parts with smaller stroke availability. In this paper the two stage control strategy of the E-ELT field stabilization is introduced. The performance of the telescope due to the wind load and in the presence of the major imperfections in the control system is presented.

Paper Details

Date Published: 6 August 2010
PDF: 12 pages
Proc. SPIE 7733, Ground-based and Airborne Telescopes III, 773340 (6 August 2010); doi: 10.1117/12.856876
Show Author Affiliations
B. Sedghi, European Organisation for Astronomical Research in the Southern Hemisphere (Germany)
M. Müller, European Organisation for Astronomical Research in the Southern Hemisphere (Germany)
H. Bonnet, European Organisation for Astronomical Research in the Southern Hemisphere (Germany)
M. Dimmler, European Organisation for Astronomical Research in the Southern Hemisphere (Germany)
B. Bauvir, European Organisation for Astronomical Research in the Southern Hemisphere (Germany)


Published in SPIE Proceedings Vol. 7733:
Ground-based and Airborne Telescopes III
Larry M. Stepp; Roberto Gilmozzi; Helen J. Hall, Editor(s)

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