The browser you are using is not supported by this website. All versions of Internet Explorer are no longer supported, either by us or Microsoft (read more here: https://www.microsoft.com/en-us/microsoft-365/windows/end-of-ie-support).

Please use a modern browser to fully experience our website, such as the newest versions of Edge, Chrome, Firefox or Safari etc.

Torben Anderssen. Profile picture.

Torben Andersen

Professor emeritus (Leave of Absence)

Torben Anderssen. Profile picture.

Status of the Euro50 project

Author

  • Torben Andersen
  • Arne Ardeberg
  • Holger Riewaldt
  • M. Lastiwka
  • N. Quinlan
  • K. McNamara
  • Xin Wang
  • Anita Enmark
  • Mette Owner-Petersen
  • A Shearer
  • Chengyu Fan
  • Dan Moraru
Show all

Summary, in English

The Euro50 is an extremely large telescope for optical and infrared wavelength with a 50 m primary mirror. It has a segmented, aspherical primary mirror and an aspherical, deformable secondary in a Gregorian layout. A tentative conceptual design exists and has been documented in a study report. Recent activities have concentrated on the science case for extremely large telescopes in the 50 m class and on identification of potential technical "show stoppers". The science case investigation has identified four fields of particular interest. The studies of critical technical issues have concentrated on atmospheric dispersion effects for high-resolution adaptive optics for extremely large telescopes, and on the influence of wind and other disturbances on wavefront control. Wind load on the telescope, the primary mirror and the enclosure has been studied using wind tunnel measurements and computational fluid dynamics. The impact of wind on the total system has been investigated using an integrated model that includes the telescope structure, the primary mirror segment alignment system, the secondary mirror alignment system, and single conjugate adaptive optics using the deformable secondary mirror. The first, tentative results show that wind disturbances may be significant and that the task of correcting for wind residuals may be at least as large for the adaptive optics system as that of correcting for atmospheric aberrations. The results suggest that use of extremely large telescopes for observations of earth-like planets around nearby stars may imply a considerable challenge

Department/s

  • Lund Observatory - Undergoing reorganization

Publishing year

2004

Language

English

Pages

407-416

Publication/Series

Proceedings of the SPIE - The International Society for Optical Engineering

Volume

5489

Issue

1

Document type

Conference paper

Publisher

SPIE

Topic

  • Astronomy, Astrophysics and Cosmology

Keywords

  • segmented aspherical primary mirror
  • atmospheric dispersion effects
  • wavefront control
  • high-resolution adaptive optics
  • wind tunnel measurements
  • wind load
  • computational fluid dynamics
  • primary mirror segment alignment system
  • 50 m
  • secondary mirror alignment system
  • deformable secondary mirror
  • exoplanet detection
  • integrated modeling
  • Euro50
  • Extremely Large Telescopes

Conference name

Ground-Based Telescopes

Conference date

2004-06-21 - 2004-06-25

Conference place

Glasgow, United Kingdom

Status

Published

ISBN/ISSN/Other

  • ISSN: 1996-756X
  • ISSN: 0277-786X