8 August 2016 Designing the primary mirror support for the E-ELT
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Abstract
Described is the M1 segment support, as designed by TNO in the period 2015-2016. The design has significantly changed and improved compared to the earlier designs. During the period 2009-2010 prototypes for the primary mirror support of the E-ELT have been developed. These have been extensively tested by ESO. Design improvement were found to be necessary, especially in the field of manufacturability and maintainability. Furthermore, the technical performance had to improve in specific areas as well. This has evolved into a new specifications which have resulted in a new design for the segment support structure. The design rules that have led to the prototype design have been maintained but the implementation has been much improved. Also considerable improvement has been obtained with respect to the dynamic behavior. Accessibility and visibility on all parts and subsystems has changed such that everything is now clearly visible. Despite the increased performance no mass increase has been recorded meaning that more efficient use has been made of the material.

The active means to influence the segment shape by use of the warping harness has been completely redesigned. A very important quality that has been achieved is simplicity. Hence a minimum amount of components is used. Reliability and safety are other aspects that have been greatly improved compared to the prototypes. The design for the M1 segment support provides a solution that not only performs to specification but one that can be operated in a telescope environment, all 798 of them.
© (2016) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jan Nijenhuis, Jeroen Heijmans, Remco den Breeje, René Hazelebach, Jan de Vreugd, Will Crowcombe, Daniel Naron, Erik Fritz, Guiseppe Borghi, Ramon Navarro, Luca Sillari, Enrico Sambenedetto, Josef Eder, Fred Kamphues, "Designing the primary mirror support for the E-ELT", Proc. SPIE 9906, Ground-based and Airborne Telescopes VI, 990616 (8 August 2016); doi: 10.1117/12.2232525; https://doi.org/10.1117/12.2232525
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