TY - GEN
T1 - From Euro50 towards a European ELT
AU - Ardeberg, Arne
AU - Andersen, Torben
AU - Beckers, Jacques
AU - Browne, Michael
AU - Enmark, Anita
AU - Knutsson, Per
AU - Owner-Petersen, Mette
PY - 2006
Y1 - 2006
N2 - 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.
AB - 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.
KW - Hierarchic control
KW - Laser guide star (LGS)
KW - Optical path differences (OPD)
KW - Differential refraction
KW - Point spread function (PSF)
KW - Extremely large telescope (ELT)
KW - Edge sensors
UR - https://www.scopus.com/pages/publications/33749016222
U2 - 10.1117/12.671392
DO - 10.1117/12.671392
M3 - Paper in conference proceeding
VL - 6267 II
SP - 26725
EP - 26725
BT - Proceedings of SPIE - The International Society for Optical Engineering
PB - International Society for Optical Engineering
T2 - Ground-based and Airborne Telescopes
Y2 - 24 May 2006 through 31 May 2006
ER -