The field stabilization and adaptive optics mirrors for the European Extremaly Large Telescope

Vernet, Elise; Jochum, L.; Penna, P. La; Hubin, N.; Muradore, Riccardo; Casalta, Joan Manel; Kjelberg, I.; Locre, F.; Morin, P.; Cousty, Raphaël; Lurçon, Jean-Marie; Roland, J. J.; Crépy, B.; Gabriel, Eric; Biasi, Roberto; Andrighettoni, Mario; Angerer, Gerald; Gallieni, Daniele; Mantegazza, Marco; Tintori, Matteo; Molinari, E.; Tresoldi, Daniela; Toso, Giorgio; Spanó, P.; Riva, M.; Crimi, Giuseppe; Riccardi, Armando; Marque, G.; Carel, Jean-Louis; Ruch, Eric

doi:10.1117/12.787855

Cited by 10 publications

(7 citation statements)

References 2 publications

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“…Between 2008 and 2010, two contracts with Microgate/ADS/SAGEM and Cilas/AMOS were run in parallel with the objective to provide a preliminary design for the 42 meter telescope E-ELT. The two contracts have provided two different designs in term of technology [4], [5] and performance. End of 2010, the E-ELT design baseline was finalized selecting the Microgate/ADS/SAGEM design.…”

Section: Project Historical Backgroundmentioning

confidence: 99%

Specifications and design of the E-ELT M4 adaptive unit

Vernet¹,

Cayrel²,

Hubin³

et al. 2012

SPIE Proceedings

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A 40 meters class telescope does require adaptive optics to provide few milli arcseconds resolution images. In the current design of the E-ELT, M4 provides adaptive correction and has also to cancel part of telescope wind shaking and static aberrations. The 2.4 meters adaptive mirror will provide as well Nasmyth focus selection.We will present the main design drivers and the main specifications quaternary mirror will have to meet. We will discuss what the challenges are in term of stability and performance of the associated key technologies. We will finally describe the current baseline design and the required schedule and work plan to adequately manufacture the E-ELT quartenary mirror.

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Section: Project Historical Backgroundmentioning

confidence: 99%

Specifications and design of the E-ELT M4 adaptive unit

Vernet¹,

Cayrel²,

Hubin³

et al. 2012

SPIE Proceedings

Self Cite

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“…These fully adaptive ELTs offer many advantages including good LGS re-imaging and high throughput [46]. However given the risk of placing several DMs in the main telescope, the reliability of DMs will be a major concern [14,25]. Assuming that the reliability issue is resolved, we consider two families of designs based on two-mirror basic configurations: Ritchey-Chrétien and aplanatic Gregorian systems.…”

Section: Fully Integrated Mcao Systemsmentioning

confidence: 99%

“…The first group features very large DMs (4-m diameter), which can be made only as segmented mirrors with current technology [14,25], yet they can be fully integrated into the main telescope design. The additional complexity made by introducing several segmented DMs in the telescope prohibits their direct use for current projects, however, novel phasing sensors might overcome difficulties with phasing segmented DMs [26].…”

Section: Introductionmentioning

confidence: 99%

Future giant telescopes: integration of MCAO into telescope design

2008

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Ground-based optical telescopes are still the fundamental tool in observational astronomy. Building future extremely large telescopes featuring AO systems is on the way with a prime goal to reach the diffraction limit in resolution with a few milliarcseconds over extended field. Current difficulties in manufacturing large deformable mirrors (DMs) limit their direct use in the main telescope system, yet it might be feasible in the future. The present paper deals with optical systems with integrated 2-3 DMs into the telescope design. Using DMs of larger diameter in the telescope, one could minimize the number of reflecting surfaces and increase the number of actuators across the DMs, hence improving throughput and reducing the AO fitting error. We present several optical designs with fully-integrated AO that provides conjugations to various heights. A comparative analysis of the imaging quality is given together with recommendations for optimal pupil diameter for each optical configuration.

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“…This telescope has a novel 5 mirror design [2] [3] including the adaptive mirror in the telescope, explaining its exceptional size. CILAS has proposed, in partnership with AMOS, BOOSTEC, ONERA, Observatoire de Paris Meudon a concept based on piezostack technology [4] that fulfills all the requirements (no show stopper identified).…”

Section: Introductionmentioning

confidence: 99%

Demonstration prototype and breadboards of the piezo stack M4 adaptive unit of the E-ELT

Crépy¹,

Chaillot²,

Cola³

et al. 2010

SPIE Proceedings

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In order to mitigate the risks of development of the M4 adaptive mirror for the E-ELT, CILAS has proposed to build a demonstration prototype and breadboards dedicated to this project. The objectives of the demonstration prototype concern the manufacturing issues such as mass assembly, integration, control and polishing but also the check the global dynamical and thermal behaviour of the mirror. The local behaviour of the mirror (polishing quality, influence function, print through…) is studied through a breadboard that can be considered as a piece of the final mirror. We propose in this paper to present our breadboard strategy, to define and present our mock-up and to comment the main results and lessons learned. Downloaded From: http://proceedings.spiedigitallibrary.org/ on 08/10/2015 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx Proc. of SPIE Vol. 7736 77365P-2 Downloaded From: http://proceedings.spiedigitallibrary.org/ on 08/10/2015 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx

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The field stabilization and adaptive optics mirrors for the European Extremaly Large Telescope

Cited by 10 publications

References 2 publications

Specifications and design of the E-ELT M4 adaptive unit

Specifications and design of the E-ELT M4 adaptive unit

Future giant telescopes: integration of MCAO into telescope design

Demonstration prototype and breadboards of the piezo stack M4 adaptive unit of the E-ELT

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