From Euro50 toward a European ELT

Arne Ardeberg; Torben Andersen; Jacques Beckers; Michael Browne; Anita Enmark; Per Knutsson; Mette Owner-Petersen

doi:10.1117/12.671392

23 June 2006 From Euro50 toward a European ELT

Arne Ardeberg, Torben Andersen, Jacques Beckers, Michael Browne, Anita Enmark, Per Knutsson, Mette Owner-Petersen

Proceedings Volume 6267, Ground-based and Airborne Telescopes; 626725 (2006) https://doi.org/10.1117/12.671392
Event: SPIE Astronomical Telescopes + Instrumentation, 2006, Orlando, Florida , United States

Abstract

With Euro50 as a convenient telescope laboratory, the Euro50 team has continued development aiming at a European extremely large telescope (ELT). Here, we give a progress report. The needs of science and instrumentation are briefly discussed as is the importance of photometric stability and precision. Results are reported from work on integrated modelling. Details are given concerning point-spread functions (PSFs) obtained with and without adaptive optics (AO). Our results are rather encouraging concerning AO photometry and compensation of edge sensor noise as well as regarding seeing-limited ELT operation. The current status of our development of large deformable mirrors is shown. Low-cost actuators and deflection sensors have been developed as have hierarchic control algorithms. Fabrication of large thin mirror blanks as well as polishing and handling of thin mirrors has been studied experimentally. Regarding adaptive optics, we discuss differential refraction and the limitations imposed by dispersive optical path differences (OPDs) and dispersive anisoplanatism. We report on progress in laser guide star (LGS) performance and a real-time online experiment in multi-conjugate AO (MCAO). We discuss ELTs, high-resolution spectroscopy and pupil slicing with and without use of AO. Finally, we present some recent studies of ELT enclosure options.

Citation Download Citation

Arne Ardeberg, Torben Andersen, Jacques Beckers, Michael Browne, Anita Enmark, Per Knutsson, and Mette Owner-Petersen "From Euro50 toward a European ELT", Proc. SPIE 6267, Ground-based and Airborne Telescopes, 626725 (23 June 2006); https://doi.org/10.1117/12.671392

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