From Euro50 towards a European ELT

被引：3

作者：

Ardeberg, Arne ^{[1
]}

Andersen, Torben ^{[1
]}

Beckers, Jacques ^{[1
]}

Browne, Michael ^{[2
]}

Enmark, Anita ^{[1
]}

Knutsson, Per ^{[1
]}

Owner-Petersen, Mette ^{[1
]}

机构：

[1] Lund Univ, Lund Observ, S-22100 Lund, Sweden

[2] Natl Univ Ireland, Galway, Ireland

来源：

GROUND-BASED AND AIRBORNE TELESCOPES, PTS 1 AND 2 | 2006年 / 6267卷

关键词：

extremely large telescope (ELT); science case; instrumentation; integrated modelling; point spread function (PSF); adaptive optics (AO); deformable mirrors; differential refraction; high-resolution spectroscopy; ELT enclosure;

D O I：

10.1117/12.671392

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 W ell 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 on-line 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.

引用

页数：10