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Proceedings Paper

LINC-NIRVANA: assembly, integration, and verification update
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Paper Abstract

We present an update on the LINC-NIRVANA (LN) instrument, an innovative Fizeau-mode beam combiner for the Large Binocular Telescope (LBT). LN will deliver 10 mas spatial resolution in the near infrared over a 10 arcsec field of view. In addition to optical-path-difference control, the instrument must correct a wide field of view on the sky using multi-conjugated adaptive optics. This substantially increases sky coverage for fringe tracking reference stars. Subsystem delivery and testing is almost complete, and final Assembly, Integration, and Verification are well advanced. We report on closed-loop control of a number of subsystems, including fine-tuning and optimization of the delay line. Measurement and remediation of instrument flexure are key to the success of LN. Several laboratory performance experiments demonstrate that components are within specification. With several interacting subsystems, LN faces a complexity challenge. A Pathfinder experiment at LBT will verify multiple aspects of LINC-NIRVANA and the telescope starting in winter 2012-2013. Finally, we report on efforts to prepare for early science exploitation in "LINC" mode, which uses single-conjugate adaptive optics.

Paper Details

Date Published: 12 September 2012
PDF: 7 pages
Proc. SPIE 8445, Optical and Infrared Interferometry III, 84450V (12 September 2012); doi: 10.1117/12.926267
Show Author Affiliations
T. M. Herbst, Max Planck Institute for Astronomy (Germany)
R. Ragazzoni, Vicolo dell'Osservatorio 5 (Italy)
A. Eckart, Univ. of Cologne (Germany)
G. Weigelt, Max Planck Institute for Radio Astronomy (Germany)

Published in SPIE Proceedings Vol. 8445:
Optical and Infrared Interferometry III
Françoise Delplancke; Jayadev K. Rajagopal; Fabien Malbet, Editor(s)

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