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Proceedings Paper

First closed-loop visible AO test results for the advanced adaptive secondary AO system for the Magellan Telescope: MagAO's performance and status
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Paper Abstract

The heart of the 6.5 Magellan AO system (MagAO) is a 585 actuator adaptive secondary mirror (ASM) with <1 msec response times (0.7 ms typically). This adaptive secondary will allow low emissivity and high-contrast AO science. We fabricated a high order (561 mode) pyramid wavefront sensor (similar to that now successfully used at the Large Binocular Telescope). The relatively high actuator count (and small projected ~23 cm pitch) allows moderate Strehls to be obtained by MagAO in the “visible” (0.63-1.05 μm). To take advantage of this we have fabricated an AO CCD science camera called "VisAO". Complete “end-to-end” closed-loop lab tests of MagAO achieve a solid, broad-band, 37% Strehl (122 nm rms) at 0.76 μm (i’) with the VisAO camera in 0.8” simulated seeing (13 cm ro at V) with fast 33 mph winds and a 40 m Lo locked on R=8 mag artificial star. These relatively high visible wavelength Strehls are enabled by our powerful combination of a next generation ASM and a Pyramid WFS with 400 controlled modes and 1000 Hz sample speeds (similar to that used successfully on-sky at the LBT). Currently only the VisAO science camera is used for lab testing of MagAO, but this high level of measured performance (122 nm rms) promises even higher Strehls with our IR science cameras. On bright (R=8 mag) stars we should achieve very high Strehls (>70% at H) in the IR with the existing MagAO Clio2 (λ=1-5.3 μm) science camera/coronagraph or even higher (~98% Strehl) the Mid-IR (8-26 microns) with the existing BLINC/MIRAC4 science camera in the future. To eliminate non-common path vibrations, dispersions, and optical errors the VisAO science camera is fed by a common path advanced triplet ADC and is piggy-backed on the Pyramid WFS optical board itself. Also a high-speed shutter can be used to block periods of poor correction. The entire system passed CDR in June 2009, and we finished the closed-loop system level testing phase in December 2011. Final system acceptance (“pre-ship” review) was passed in February 2012. In May 2012 the entire AO system is was successfully shipped to Chile and fully tested/aligned. It is now in storage in the Magellan telescope clean room in anticipation of “First Light” scheduled for December 2012. An overview of the design, attributes, performance, and schedule for the Magellan AO system and its two science cameras are briefly presented here.

Paper Details

Date Published: 13 September 2012
PDF: 16 pages
Proc. SPIE 8447, Adaptive Optics Systems III, 84470X (13 September 2012); doi: 10.1117/12.926545
Show Author Affiliations
Laird M. Close, Steward Observatory, The Univ. of Arizona (United States)
Jared R. Males, Steward Observatory, The Univ. of Arizona (United States)
Derek A. Kopon, Steward Observatory, The Univ. of Arizona (United States)
Victor Gasho, Steward Observatory, The Univ. of Arizona (United States)
Katherine B. Follette, Steward Observatory, The Univ. of Arizona (United States)
Phil Hinz, Steward Observatory, The Univ. of Arizona (United States)
Katie Morzinski, Steward Observatory, The Univ. of Arizona (United States)
Alan Uomoto, OCIW (United States)
Tyson Hare, OCIW (United States)
Armando Riccardi, Arcetri Observatory, Univ. degli studi di (Italy)
Simone Esposito, Arcetri Observatory, Univ. degli studi di (Italy)
Alfio Puglisi, Arcetri Observatory, Univ. degli studi di (Italy)
Enrico Pinna, Arcetri Observatory, Univ. degli studi di (Italy)
Lorenzo Busoni, Arcetri Observatory, Univ. degli studi di (Italy)
Carmelo Arcidiacono, Arcetri Observatory, Univ. degli studi di (Italy)
Marco Xompero, Arcetri Observatory, Univ. degli studi di (Italy)
Runa Briguglio, Arcetri Observatory, Univ. degli studi di (Italy)
Fernando Quiros-Pacheco, Arcetri Observatory, Univ. degli studi di (Italy)
Javier Argomedo, Arcetri Observatory, Univ. degli studi di (Italy)


Published in SPIE Proceedings Vol. 8447:
Adaptive Optics Systems III
Brent L. Ellerbroek; Enrico Marchetti; Jean-Pierre Véran, Editor(s)

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