10.13009/AO4ELT2/2011.065
Conrad, Al
Al
Conrad
Bertram, Thomas
Thomas
Bertram
Kurster, Martin
Martin
Kurster
Herbst, Tom
Tom
Herbst
Ragazzoni, Roberto
Roberto
Ragazzoni
Farinato, Jacopo
Jacopo
Farinato
Brangier, Matthieu
Matthieu
Brangier
Viotto, Valentina
Valentina
Viotto
Bergomi, Maria
Maria
Bergomi
Brunelli, Alessandro
Alessandro
Brunelli
Arcidiacono, Carmelo
Carmelo
Arcidiacono
Pott, Jorg-Uwe
Jorg-Uwe
Pott
Bizenberger, Peter
Peter
Bizenberger
Briegel, Florian
Florian
Briegel
Hofferbert, Ralph
Ralph
Hofferbert
Meschke, Daniel
Daniel
Meschke
Mohr, Lars
Lars
Mohr
Rohloff, Ralf-Rainer
Ralf-Rainer
Rohloff
Baumeister, Harald
Harald
Baumeister
De Bonis, Fulvio
Fulvio
De Bonis
Zhang, Xianyu
Xianyu
Zhang
Trowitzsch, Jan
Jan
Trowitzsch
Berwein, Jurgen
Jurgen
Berwein
Kittmann, Frank
Frank
Kittmann
Status and plans for the LINC-NIRVANA Pathfinder
Proceedings of the AO4ELT2 conference (Publisher: ONERA; Editors: J.-P. Véran, Y. Clénet, T. Fusco)
2011
Article
ADAPTIVE OPTICS
EXTREMELY LARGE TELESCOPES
PATHFINDERS
INSTRUMENTS
WAVEFRONT CORRECTORS
WAVEFRONT SENSING
LASER GUIDE STAR SYSTEMS
ATMOSPHERIC TURBULENCE
REAL-TIME CONTROL
MODELING
POST-PROCESSING
2011
en
7 pages
PDF
Layer-oriented Multi-conjugate Adaptive Optics systems apply two
or more wavefront sensors (WFS), each with its own deformable mirror (DM)
and each conjugate to a different turbulent layer in the atmosphere. Because these
sensors apply correction in series, they are largely decoupled from one another,
lending them to a phased commissioning approach. Commissioning instruments
on large telescopes, while almost always successful in the end, can be, experience
has shown, inefficient and difficult to schedule. For LINC-NIRVANA we
plan to take advantage of the natural decoupling between the ground-layer subsystem
(a 12-star pyramid WFS operating in conjunction with the LBT adaptive
secondary) and the mid-high subsystem (an 8-star pyramid WFS working in conjunction
with a Xynetics 349 actuator DM) to mitigate the difficulties that have
been experienced commissioning complex instruments on large, over-subscribed,
telescopes. Pathfinder is a test-bed, consisting of only those subsystems needed to
operate, stand-alone, one of the two LINC-NIRVANA ground-layer subsystems.
The Pathfinder effort will tease out top-level interface issues; while at the same
time providing a valuable characterization of the Mount Graham ground-layer.
To what extent will this ground-layer system provide a seeing-corrected image to
the next WFS/DM pair in the LINC-NIRVANA system: the mid-high wavefrontsensor
(MHWS)? We present status and plans for the LINC-NIRVANA Pathfinder
effort, a novel approach for commissioning MCAO systems on large telescopes.