The HIA MCAO laboratory bench

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Proceedings titleSPIE - International Society for Optical Engineering. Proceedings
ConferenceAdaptive Optics Systems III, 1 July 2012 through 6 July 2012, Amsterdam
Article number844750
SubjectCalibration procedure; Closed-loop; Controlled conditions; End-to-end simulation; Laboratory experiments; Multiconjugate adaptive optics; Non-uniformities; Optimization method; Scaled-down versions; Second time scale; Shack-Hartmann; Sodium layer; Thirty Meter Telescope; Tomographic; Tomographic reconstruction; MATLAB; Sodium; Tomography; Adaptive optics
AbstractThis paper presents an update on the design and deployment of the HIA MCAO laboratory bench. This bench directly supports the development of NFIRAOS, the first light MCAO facility for the Thirty Meter Telescope. The bench implements a closed-loop MCAO system, with two magnetic DMs, four LGS Shack-Hartmann WFSs, two NGS T/T WFS, one NGS T/T/F WFS and one higher order Truth WFS, making up a scaled down version of NFIRAOS. The bench includes several artificial turbulence screens and reproduces realistic LGS spot elongations. It is driven by software in Matlab, frame-rates ranging from 1Hz to 15Hz. The goals of this bench are to anchor the NFIRAOS end-to-end simulation tools; to exercise real-time LGS tomographic AO in a variety of well controlled conditions, such as faint and poorly corrected NGSs, non-uniformities in the sodium layer and field dependant Non-Common-Path Aberrations (NCPAs); develop and demonstrate calibration procedures, such as PSF reconstruction and tomographic reconstruction and correction of field dependant NCPAs; and to validate optimization methods that operate at 10+ second time scales, which is not tractable in a numerical simulation, such as matched filter update and Cn2 estimation using a SLODAR method. © 2012 SPIE.
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AffiliationNational Research Council Canada (NRC-CNRC); NRC Herzberg Institute of Astrophysics (HIA-IHA)
Peer reviewedYes
NPARC number21269227
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Record identifierb58ee6d5-589d-4689-ac41-61a2dd4ce0b0
Record created2013-12-12
Record modified2017-04-24
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