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Proceedings Article

Meeting highest performance requirements for lowest price and mass for the M1 segment support unit for E-ELT

[+] Author Affiliations
Jan Nijenhuis, Roger Hamelinck, Ben Braam

TNO Science and Industry (Netherlands)

M. Cayrel

European Organisation for Astronomical Research in the Southern Hemisphere (Germany)

Proc. SPIE 7733, Ground-based and Airborne Telescopes III, 77332H (August 05, 2010); doi:10.1117/12.857175
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From Conference Volume 7733

  • Ground-based and Airborne Telescopes III
  • Larry M. Stepp; Roberto Gilmozzi; Helen J. Hall
  • San Diego, California, USA | June 27, 2010

abstract

The largest optical telescope in the world will be the E-ELT. Its primary mirror will be 42m in diameter. This mirror will consist of 984 hexagonal segments that are all individually supported. Each mirror will be controlled in six DOF while local shaping of the segments is provided by so called warping harnesses. These will correct for focus, astigmatism and trefoil. Hence a mirror with an extreme diameter to thickness ratio of almost 30 is obtained. Its support structure must guarantee a maximum surface form error of 30 nm rms independent of the segment attitude. Furthermore its stiffness to mass ratio must allow natural frequencies of 50Hz or higher to obtain sufficient bandwidth for the actuators that control the piston and tip/tilt of the segment. Designing such structure is a challenge that has been successfully completed. Three prototypes have been built and are about to be delivered to ESO. This paper discusses the main performance requirements and how they could be transferred into an elegant structure design. Furthermore an overview will be given on the main performance parameters in order to see whether the present design can be further optimized.

© (2010) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Jan Nijenhuis ; Roger Hamelinck ; Ben Braam and M. Cayrel
"Meeting highest performance requirements for lowest price and mass for the M1 segment support unit for E-ELT", Proc. SPIE 7733, Ground-based and Airborne Telescopes III, 77332H (August 05, 2010); doi:10.1117/12.857175; http://dx.doi.org/10.1117/12.857175


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