Status and plans for the LINC-NIRVANA Pathfinder

Al Conrad, Thomas Bertram, Martin Kurster, Tom Herbst, Roberto Ragazzoni, Jacopo Farinato, Matthieu Brangier, Valentina Viotto, Maria Bergomi, Alessandro Brunelli, Carmelo Arcidiacono, Jorg-Uwe Pott, Peter Bizenberger, Florian Briegel, Ralph Hofferbert, Daniel Meschke, Lars Mohr, Ralf-Rainer Rohloff, Harald Baumeister, Fulvio De Bonis, Xianyu Zhang, Jan Trowitzsch, Jurgen Berwein & Frank Kittmann
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...