The Giant Magellan Telescope adaptive optics program

Bouchez, Antonin H.; Acton, D. Scott; Agapito, Guido; Arcidiacono, Carmelo; Bennet, Francis; Biliotti, Valdemaro; Bonaglia, Marco; Briguglio, Runa; Brusa-Zappellini, Guido; Busoni, Lorenzo; Carbonaro, Luca; Codona, Johanan L.; Conan, Rodolphe; Connors, Tom; Durney, Oli; Espeland, Brady; Esposito, Simone; Fini, Luca; Gardhouse, Rusty; Gauron, Thomas; Hart, Michael; Hinz, Philip; Kanneganti, Srikrishna; Kibblewhite, E. J.; Knox, Russell P.; McLeod, B. A.; McMahon, Thomas J.; Montoya, Manny; Norton, Timothy; Ordway, Mark; d’Orgeville, Céline; Parcell, Simon; Piatrou, Piotr; Pinna, Enrico; Price, Ian; Puglisi, Alfio; Quirós-Pacheco, Fernando; Riccardi, Armando; Roll, John; Trancho, Gelys; Uhlendorf, Kristina; Vaitheeswaran, Vidhya; Dam, Marcos A. van; Weaver, D.; Xompero, Marco

doi:10.1117/12.926691

Cited by 14 publications

(9 citation statements)

References 17 publications

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“…The standard version of the Kalman filter proves to be impractical in terms of implementation for large-scale systems, like extremely large telescopes (ELTs) currently under design and construction [6][7][8], due to the excessive cost to solve the Riccati equation, which is a central step in the computation of the filter. Several approaches have been proposed to overcome this computational bottleneck [9][10][11][12], among which, a distributed version of the Kalman filter [13].…”

Section: Introductionmentioning

confidence: 99%

Adaptive distributed Kalman filtering with wind estimation for astronomical adaptive optics

2015

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In the framework of adaptive optics (AO) for astronomy, it is a common assumption to consider the atmospheric turbulent layers as "frozen flows" sliding according to the wind velocity profile. For this reason, having knowledge of such a velocity profile is beneficial in terms of AO control system performance. In this paper we show that it is possible to exploit the phase estimate from a Kalman filter running on an AO system in order to estimate wind velocity. This allows the update of the Kalman filter itself with such knowledge, making it adaptive. We have implemented such an adaptive controller based on the distributed version of the Kalman filter, for a realistic simulation of a multi-conjugate AO system with laser guide stars on a 30 m telescope. Simulation results show that this approach is effective and promising and the additional computational cost with respect to the distributed filter is negligible. Comparisons with a previously published slope detection and ranging wind profiler are made and the impact of turbulence profile quantization is assessed. One of the main findings of the paper is that all flavors of the adaptive distributed Kalman filter are impacted more significantly by turbulence profile quantization than the static minimum mean square estimator which does not incorporate wind profile information.

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Section: Introductionmentioning

confidence: 99%

Adaptive distributed Kalman filtering with wind estimation for astronomical adaptive optics

2015

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“…GMT delivers AO-corrected images 21 to the instruments installed at the folded ports provided that the instrument complies with the wavefront sensor requirements. These include:…”

Section: Adaptive Optics (Ao)mentioning

confidence: 99%

Status of the instrumentation program for the Giant Magellan Telescope

et al. 2014

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Instrument development for the 25 m class optical/infrared Giant Magellan Telescope (GMT) is actively underway. Two instruments have begun their preliminary design phase: an optical (350-1000 nm) high resolution and precision radial velocity echelle spectrograph (G-CLEF), and a near-IR (YJHK) diffraction-limited imager/integral-field-spectrograph (GMTIFS). A third instrument will begin its design phase in early 2015: an optical (370-1000 nm) low-to-medium resolution multi-object spectrograph (GMACS). Two other instrument teams are focusing on prototypes to demonstrate final feasibility: a near-to-mid-IR (JHKLM) high resolution diffraction-limited echelle (GMTNIRS) spectrograph, and a facility robotic multi-fiber-feed (MANIFEST). A brief overview of the GMT instrumentation program is presented: current activities, progress, status, and schedule, as well as a summary of the facility infrastructure needed to support the instruments.

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“…The primary goal of adaptive optics on the GMT 3 is the correction of atmospheric blurring to recover images with the diffraction-limited beam profile, thus providing the GMT with correspondingly improved sensitivity and resolution. The GMT large aperture holds the potential of uniquely sharp images, three times sharper than the limit for an 8 m aperture.…”

Section: Introductionmentioning

confidence: 99%

The Giant Magellan Telescope laser tomography adaptive optics system

Conan

Bennet

Bouchez³

et al. 2012

SPIE Proceedings

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The Giant Magellan Telescope presents a unique optical design with seven 8.4m diameter primary mirrors matched by seven adaptive secondary mirrors (ASM). The ASMs can be controlled in several different Adaptive optics (AO) observing modes coupled to the telescope. One of these AO systems, the Laser Tomography Adaptive Optics (LTAO) system is currently in its preliminary design phase. The LTAO observing mode will provide a Strehl ratio in H band of at least 30% over more than 20% of the sky and an ensquared energy in K band of at least 40% in a 50 milli-arcsec spaxel over more than 50% of the sky. To achieve its performance requirements, the LTAO observing mode uses six 20W Laser Guide Stars (LGS) with six order-50x50 Shack-Hartmann wavefront sensors. The LGSs are launched from three locations at the periphery of the telescope primaries. A natural guide star (NGS) is used separately to measure tip-tilt, focus and low-bandwidth-loworder aberrations. A open-loop controlled deformable mirror corrects the off-axis NGS infrared wavefront. We give an update on the design of the LTAO WFSs, the LGS facility, the on-instrument wavefront sensors and the tomography and control algorithms.

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The Giant Magellan Telescope adaptive optics program

Cited by 14 publications

References 17 publications

Adaptive distributed Kalman filtering with wind estimation for astronomical adaptive optics

Adaptive distributed Kalman filtering with wind estimation for astronomical adaptive optics

Status of the instrumentation program for the Giant Magellan Telescope

The Giant Magellan Telescope laser tomography adaptive optics system

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