TY - GEN
T1 - Euro50
AU - Andersen, Torben
AU - Ardeberg, Arne
AU - Beckers, J
AU - Gontcharov, Alexander
AU - Owner-Petersen, Mette
AU - Riewaldt, Holger
PY - 2003
Y1 - 2003
N2 - 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
AB - 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
KW - optical wavelength telescope
KW - infrared wavelength telescope
KW - aspherical primary mirror
KW - Gregorian type optical configuration
KW - Nasmyth foci
KW - Gregorian foci
KW - relay mirrors
KW - single conjugate adaptive optics
KW - dual conjugate adaptive optics
KW - ground layer correction
KW - clam shell corrector
KW - precessions polishing technique
KW - joint segment alignment system
KW - wavefront sensors
KW - secondary mirror control system
KW - main axes servos
KW - natural guide stars
KW - 50 m
KW - primary mirror segment edge sensors
KW - laser guide stars
KW - wind protection
KW - carbon fiber reinforced polymer
KW - perspective elongation problem
KW - box-shaped steel structure
KW - live optics architecture
KW - sum frequency YAG lasers
KW - straw man concept
KW - Euro50 telescope
U2 - 10.1117/12.566203
DO - 10.1117/12.566203
M3 - Paper in conference proceeding
VL - 5382
SP - 169
EP - 182
BT - Proceedings of the SPIE - The International Society for Optical Engineering
A2 - Ardeberg, Arne
A2 - Andersen, Torben
PB - SPIE
T2 - Second Bäckaskog Workshop on Extremely Large Telescopes, 2003
Y2 - 9 September 2003 through 11 September 2003
ER -