CANARY: the on-sky NGS/LGS MOAO demonstrator for EAGLE

Myers, R; Hubert, Z.; Morris, Tim; Gendron, É.; Dipper, N. A.; Kellerer, Aglae; Goodsell, Stephen J.; Rousset, G.; Younger, Eddy; Marteaud, M.; Basden, Alastair; Chemla, Fanny; Egaña, José Tomás; Fusco, Thierry; Geng, Deli; Roux, Brice Le; Harrison, Mike; Longmore, A. J.; Young, Laura K.; Vidal, Fabrice; Greenaway, A. H.

doi:10.1117/12.789544

Cited by 41 publications

(23 citation statements)

References 2 publications

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“…The project has been planned with several phases of increasing system complexity (Myers et al 2008) to lead to a comprehensive demonstration of the MOAO configuration as foreseen for Eagle on the E-ELT ).…”

Section: Phase B Designmentioning

confidence: 99%

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Wave-front error breakdown in laser guide star multi-object adaptive optics validated on-sky by Canary

Martin

Gendron

Rousset

et al. 2017

A&A

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Context. Canary is the multi-object adaptive optics (MOAO) on-sky pathfinder developed in the perspective of multi-object spectrograph on extremely large telescopes (ELTs). In 2013, Canary was operated on-sky at the William Herschel telescope (WHT), using three off-axis natural guide stars (NGS) and four off-axis Rayleigh laser guide stars (LGS), in open-loop, with the on-axis compensated turbulence observed with a H-band imaging camera and a Truth wave-front sensor (TS) for diagnostic purposes. Aims. Our purpose is to establish a reliable and accurate wave-front error breakdown for LGS MOAO. This will enable a comprehensive analysis of Canary on-sky results and provide tools for validating simulations of MOAO systems for ELTs. Methods. To evaluate the MOAO performance, we compared the Canary on-sky results running in MOAO, in single conjugated adaptive optics (SCAO) and in ground layer adaptive optics (GLAO) modes, over a large set of data acquired in 2013. We provide a statistical study of the seeing. We also evaluated the wave-front error breakdown from both analytic computations, one based on a MOAO system modelling and the other on the measurements from the Canary TS. We have focussed especially on the tomographic error and we detail its vertical error decomposition. Results. We show that Canary obtained 30.1%, 21.4% and 17.1% H-band Strehl ratios in SCAO, MOAO and GLAO respectively, for median seeing conditions with 0.66 of total seeing including 0.59 at the ground. Moreover, we get 99% of correlation over 4500 samples, for any AO modes, between two analytic computations of residual phase variance. Based on these variances, we obtain a reasonable Strehl-ratio (SR) estimation when compared to the measured IR image SR. We evaluate the gain in compensation for the altitude turbulence brought by MOAO when compared to GLAO.

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Section: Phase B Designmentioning

confidence: 99%

“…To demonstrate the technical feasibility of MOAO sky observations, the pathfinder Canary (Myers et al 2008) has been developed by an international consortium. It began in 2007, with first light in 2010 at the William Herschel Telescope (WHT) on La Palma, in the Canary islands (Spain) (Gendron et al 2011).…”

Section: Introductionmentioning

confidence: 99%

Wave-front error breakdown in laser guide star multi-object adaptive optics validated on-sky by Canary

Martin

Gendron

Rousset

et al. 2017

A&A

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“…It is conveniently situated for access by European development teams 4. The telescope board encourages this important role for the WHT Following this conclusion, several proposals were developed for experiments and test facilities on the WHT, and OPTICON support under FP7 gained for a Multi-Object Adaptive Optics on-sky demonstrator: CANARY [18]. It was designed to use the existing Rayleigh laser guide star (RLGS) to construct a 10:1 Scale model of the E-ELT, making use of the fact that the RLGS can be gated to generate a guide star at a range of altitudes.…”

Section: William Herschel Telescope Test-bedmentioning

confidence: 99%

The OPTICON technology roadmap for optical and infrared astronomy

2010

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The Key Technology Network (KTN) within the OPTICON programme has been developing a roadmap for the technology needed to meet the challenges of optical and infrared astronomy over the next few years, with particular emphasis on the requirements of Extremely Large Telescopes. The process and methodology so far will be described, along with the most recent roadmap.The roadmap shows the expected progression of ground-based astronomy facilities and the technological developments which will be required to realise these new facilities. The roadmap highlights the key stages in the development of these technologies.In some areas, such as conventional optics, gradual developments in areas such as light-weighting of optics will slowly be adopted into future instruments. In other areas, such as large area IR detectors, more rapid progress can be expected as new processing techniques allow larger and faster arrays. Finally, other areas such as integrated photonics have the potential to revolutionise astronomical instrumentation.Future plans are outlined, in particular our intention to look at longer term development and disruptive technologies.

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“…Each of them will use 1 Deformable Mirror (DM) working in open-loop driven by the tomographic reconstruction using the wavefront information provided by the 6 Laser Guide Stars (LGS) WFS and 5 Natural Guide Stars (NGS) off-axis WFS. CANARY [4], the MOAO pathfinder for EAGLE, is an open loop and tomography experiment that will be installed in 2010 at the William Herschel Telescope (D=4.2m) at La Palma, in the Canaries islands.…”

Section: Contextmentioning

confidence: 99%

Tomography reconstruction using the Learn and Apply algorithm

Vidal¹,

Gendron²,

Brangier³

et al. 2010

1st AO4ELT Conference - Adaptive Optics for Extremely Large Telescopes

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Abstract. In the framework of the MOAO demonstrator CANARY, we developped a new concept of tomography algorithm that allows to measure the tomographic reconstructor directly on-sky, using or not, a priori from the turbulence profile. This simple algorithm, working in open-loop, uses the measured covariance of slopes between all the wavefront sensors (WFS) to deduce the geometric and atmospheric parameters that are used to compute the tomographic reconstructor. This method called "Learn and Apply" (L&A) has also the advantage to measure and take into account all the misalignments between the WFSs in order to calibrate any MOAO instrument. We present the main principle of the algorithm and the last experimental results performed in MOAO scheme at the SESAME bench. ContextOne of the key scientific drivers of the future giant telescopes of the class 30-50m is the formation of the early universe, and in particular the way distant galaxies assembled. These extremely dim and small objects require both the large light-collecting power of an Extremely Large Telescope (ELT) together with a high spatial resolution brought by adaptive optics (AO). Moreover, the galaxies need to be studied through a statistical approach, that require to be able to observe a wealth of them. Dealing with minimum integration times of the order 8 hours for each, the only way to achieve this is thus to multiplex the observations. These requirements led in 2004 [1] to the concept of Multi-Object Adaptive Optics, or MOAO, fully inherited from the FALCON concept presented in 2001 [2] . A MOAO instrument is composed of individual systems that split the field. Some compensate the wavefront onto the small (few arcsecond) areas of the galaxies. They are driven by the wavefront information collected from the others systems : the off-axis wavefront sensors (WFS) that pick their signals from either natural or artificial stars across the field. The way the wavefront measurement are combined together in order to extract the wavefront control is the tomographic reconstruction.EAGLE [3] is an MOAO instrument under conceptual study for the European Extremely Large Telescope (E-ELT). It will cover a field of view of 5 arcminutes. The top level requirements of the instrument call for 20 spectroscopic channels in the near infrared. Each of them will use 1 Deformable Mirror (DM) working in open-loop driven by the tomographic reconstruction using the wavefront information provided by the 6 Laser Guide Stars (LGS) WFS and 5 Natural Guide Stars (NGS) off-axis WFS. CANARY [4], the MOAO pathfinder for EAGLE, is an open loop and tomography experiment that will be installed in 2010 at the William Herschel Telescope (D=4.2m) at La Palma, in the Canaries islands. TomographyOne of the main adaptive optics limitation is the anisoplanetism angle. A guide star is required to sense the wavefront. The angular distance between the object and the guide star needs to be sufficiently short or the AO performance will decrease as the guide star gets further. This limiting angle is call...

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CANARY: the on-sky NGS/LGS MOAO demonstrator for EAGLE

Cited by 41 publications

References 2 publications

Wave-front error breakdown in laser guide star multi-object adaptive optics validated on-sky by Canary

Wave-front error breakdown in laser guide star multi-object adaptive optics validated on-sky by Canary

The OPTICON technology roadmap for optical and infrared astronomy

Tomography reconstruction using the Learn and Apply algorithm

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