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Evaluating sky coverage for the NFIRAOS tip/tilt control architecture

Wang, Lianqi and Ellerbroek, Brent and Véran, Jean-Pierre and Sinquin, Jean-Christophe (2008) Evaluating sky coverage for the NFIRAOS tip/tilt control architecture. In: Adaptive Optics Systems. Proceedings of SPIE. No.7015. Society of Photo-Optical Instrumentation Engineers , Bellingham, WA, Art. No. 70155X. ISBN 9780819472250. http://resolver.caltech.edu/CaltechAUTHORS:20181217-111812163

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Abstract

The Narrow Field Infrared Adaptive Optics System (NFIRAOS) is the first light Laser Guide Star (LGS) Multi-Conjugate Adaptive Optics (MCAO) system for TMT. NFIRAOS needs to correct 2-axis tip/tilt jitter disturbances, including both telescope vibration and atmospheric tip/tilt, to a residual of 2 milli-arcsecond (mas) RMS with 50% sky coverage at the Galactic pole. NFIRAOS will utilize multiple infrared tip/tilt sensors, as sky coverage benefits greatly from wavefront sensing in the near IR where guide star densities are greater and the NFIRAOS AO system "sharpens" the guide star images. NFIRAOS will also utilize type II woofer-tweeter control to correct tip/tilt jitter. High amplitude, low bandwidth errors are corrected by a tip/tilt platform (woofer), whereas the low amplitude, high bandwidth disturbances are corrected by the deformable mirrors. A prototype development effort for the relatively large, massive DM tip/tilt stage is now underway. Detailed Monte Carlo simulations of the complete architecture indicate that the sky coverage and tip/tilt control requirement for NFIRAOS can be met, with some margin available for stronger input disturbances or shortfalls in component performance.


Item Type:Book Section
Related URLs:
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https://doi.org/10.1117/12.787975DOIArticle
Additional Information:© 2008 Society of Photo-Optical Instrumentation Engineers. The authors gratefully acknowledge the support of the TMT partner institutions. They are the Association of Canadian Universities for Research in Astronomy (ACURA), the California Institute of Technology and the University of California. This work was supported as well by the Gordon and Betty Moore Foundation, the Canada Foundation for Innovation, the Ontario Ministry of Research and Innovation, the National Research Council of Canada, the Natural Sciences and Engineering Research Council of Canada, the British Columbia Knowledge Development Fund, the Association of Universities for Research in Astronomy (AURA) and the U.S. National Science Foundation.
Group:Thirty Meter Telescope
Funders:
Funding AgencyGrant Number
Association of Canadian Universities for Research in Astronomy (ACURA)UNSPECIFIED
CaltechUNSPECIFIED
University of CaliforniaUNSPECIFIED
Gordon and Betty Moore FoundationUNSPECIFIED
Canada Foundation for InnovationUNSPECIFIED
Ontario Ministry of Research and InnovationUNSPECIFIED
National Research Council of CanadaUNSPECIFIED
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
British Columbia Knowledge Development FundUNSPECIFIED
Association of Universities for Research in Astronomy (AURA)UNSPECIFIED
NSFUNSPECIFIED
Record Number:CaltechAUTHORS:20181217-111812163
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20181217-111812163
Official Citation:Lianqi Wang, Brent Ellerbroek, Jean-Pierre Véran, Jean-Christophe Sinquin, "Evaluating sky coverage for the NFIRAOS tip/tilt control architecture," Proc. SPIE 7015, Adaptive Optics Systems, 70155X (15 July 2008); doi: 10.1117/12.787975
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:91861
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:18 Dec 2018 19:47
Last Modified:18 Dec 2018 19:47

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