Advanced

Euro50

Andersen, Torben LU ; Ardeberg, Arne LU ; Beckers, J; Gontcharov, Alexander LU ; Owner-Petersen, Mette LU and Riewaldt, Holger LU (2003) Second Bäckaskog Workshop on Extremely Large Telescopes, 2003 In Proceedings of the SPIE - The International Society for Optical Engineering 5382(1). p.169-182
Abstract
The Euro50 is a telescope for optical and infrared wavelengths. It has an aspherical primary mirror with a size of 50 meters and 618 segments. The optical configuration is of Gregorian type and the secondary mirror is deformable for adaptive optics. Observations can take place in prime focus, Gregorian foci, and Nasmyth foci using additional relay mirrors. The telescope provides seeing limited observations, partial adaptive optics with ground layer correction, single conjugate adaptive optics and dual-conjugate adaptive optics. For prime focus observations, a clam-shell corrector with a doublet lens is used. The primary mirror segments can be polished using the precessions polishing technique. "Live Optics" denotes the joint segment... (More)
The Euro50 is a telescope for optical and infrared wavelengths. It has an aspherical primary mirror with a size of 50 meters and 618 segments. The optical configuration is of Gregorian type and the secondary mirror is deformable for adaptive optics. Observations can take place in prime focus, Gregorian foci, and Nasmyth foci using additional relay mirrors. The telescope provides seeing limited observations, partial adaptive optics with ground layer correction, single conjugate adaptive optics and dual-conjugate adaptive optics. For prime focus observations, a clam-shell corrector with a doublet lens is used. The primary mirror segments can be polished using the precessions polishing technique. "Live Optics" denotes the joint segment alignment system, secondary mirror control system, adaptive optics and main axes servos. An overview is given of the live optics architecture, including feedback from wavefront sensors for natural and laser guide stars, and from primary mirror segment edge sensors. A straw man concept of the laser guide star system using sum-frequency YAG lasers is presented together with a solution to the laser guide star perspective elongation problem. The structural design involves a large steel structure and a tripod of carbon fiber reinforced polymer to support the secondary mirror. Integrated models have been set up to simulate telescope performance. Results show that an enclosure is needed to protect the telescope against wind during observations. The enclosure is very large box-shaped steel structure (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
optical wavelength telescope, infrared wavelength telescope, aspherical primary mirror, Gregorian type optical configuration, Nasmyth foci, Gregorian foci, relay mirrors, single conjugate adaptive optics, dual conjugate adaptive optics, ground layer correction, clam shell corrector, precessions polishing technique, joint segment alignment system, wavefront sensors, secondary mirror control system, main axes servos, natural guide stars, 50 m, primary mirror segment edge sensors, laser guide stars, wind protection, carbon fiber reinforced polymer, perspective elongation problem, box-shaped steel structure, live optics architecture, sum frequency YAG lasers, straw man concept, Euro50 telescope
in
Proceedings of the SPIE - The International Society for Optical Engineering
editor
Ardeberg, Arne; Andersen, Torben; and
volume
5382
issue
1
pages
169 - 182
publisher
SPIE
conference name
Second Bäckaskog Workshop on Extremely Large Telescopes, 2003
external identifiers
  • wos:000223325000021
  • scopus:5444247934
ISSN
0277-786X
1996-756X
DOI
10.1117/12.566203
language
English
LU publication?
yes
id
17b47e14-d79e-4859-af1f-05e08d2bebc1 (old id 614422)
date added to LUP
2007-11-27 08:45:07
date last changed
2018-05-29 09:40:53
@inproceedings{17b47e14-d79e-4859-af1f-05e08d2bebc1,
  abstract     = {The Euro50 is a telescope for optical and infrared wavelengths. It has an aspherical primary mirror with a size of 50 meters and 618 segments. The optical configuration is of Gregorian type and the secondary mirror is deformable for adaptive optics. Observations can take place in prime focus, Gregorian foci, and Nasmyth foci using additional relay mirrors. The telescope provides seeing limited observations, partial adaptive optics with ground layer correction, single conjugate adaptive optics and dual-conjugate adaptive optics. For prime focus observations, a clam-shell corrector with a doublet lens is used. The primary mirror segments can be polished using the precessions polishing technique. "Live Optics" denotes the joint segment alignment system, secondary mirror control system, adaptive optics and main axes servos. An overview is given of the live optics architecture, including feedback from wavefront sensors for natural and laser guide stars, and from primary mirror segment edge sensors. A straw man concept of the laser guide star system using sum-frequency YAG lasers is presented together with a solution to the laser guide star perspective elongation problem. The structural design involves a large steel structure and a tripod of carbon fiber reinforced polymer to support the secondary mirror. Integrated models have been set up to simulate telescope performance. Results show that an enclosure is needed to protect the telescope against wind during observations. The enclosure is very large box-shaped steel structure},
  author       = {Andersen, Torben and Ardeberg, Arne and Beckers, J and Gontcharov, Alexander and Owner-Petersen, Mette and Riewaldt, Holger},
  booktitle    = {Proceedings of the SPIE - The International Society for Optical Engineering},
  editor       = {Ardeberg, Arne and Andersen, Torben},
  issn         = {0277-786X},
  keyword      = {optical wavelength telescope,infrared wavelength telescope,aspherical primary mirror,Gregorian type optical configuration,Nasmyth foci,Gregorian foci,relay mirrors,single conjugate adaptive optics,dual conjugate adaptive optics,ground layer correction,clam shell corrector,precessions polishing technique,joint segment alignment system,wavefront sensors,secondary mirror control system,main axes servos,natural guide stars,50 m,primary mirror segment edge sensors,laser guide stars,wind protection,carbon fiber reinforced polymer,perspective elongation problem,box-shaped steel structure,live optics architecture,sum frequency YAG lasers,straw man concept,Euro50 telescope},
  language     = {eng},
  number       = {1},
  pages        = {169--182},
  publisher    = {SPIE},
  title        = {Euro50},
  url          = {http://dx.doi.org/10.1117/12.566203},
  volume       = {5382},
  year         = {2003},
}