Prototyping the GMT phasing camera with the Magellan AO system

Derek Kopon; Brian McLeod; Kenneth McCracken; Marcos Van Dam; Antonin Bouchez; Alan Conder; William Podgorski; Daniel Catropa; Stuart McMuldroch; Laird M Close; Jared Males; Katie Morzinski; Timothy Norton

doi:10.20353/K3T4CP1131566

Prototyping the GMT phasing camera with the Magellan AO system

Derek Kopon, Brian McLeod, Kenneth McCracken, Marcos Van Dam, Antonin Bouchez, Alan Conder, William Podgorski, Daniel Catropa, Stuart McMuldroch, Laird M Close, Jared Males, Katie Morzinski, Timothy Norton

Astronomy

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

4 Scopus citations

Abstract

The future diffraction-limited performance of the 25.4 meter Giant Magellan Telescope (GMT) will rely on the active and adaptive wavefront sensing measurements made by the Acquisition, Guiding, and Wavefront Sensor (AGWS) currently being designed by SAO. One subsystem of the AGWS, the phasing camera, will be responsible for measuring the piston phase difference between the seven GMT primary/secondary segment pairs to 50 nm accuracy with full sky coverage using natural guide stars that are 6-10 arcmin off-axis while the on-axis light is used for science operations. The phasing camera will use a dispersed fringe sensor to measure the phase difference in rectangular subapertures spanning the gaps between adjacent mirror segments. The large gap between segments (>295 mm, compared to 3 mm for the Keck telescope) reduces the coherence of light across the subapertures, making this problem particularly challenging. In support of the AGWS phasing camera technical goals, SAO has undertaken a series of prototyping efforts at the Magellan 6.5 meter Clay telescope to demonstrate the dispersed fringe sensor technology and validate atmospheric models. Our latest on-sky test, completed in December 2015, employs a dual-band (I and J) dispersed fringe sensor. This prototype uses an adaptive optics corrected beam from the Magellan AO adaptive secondary system. The system operates both on-axis and 6 arcmin off-axis from the natural guide star feeding the MagAO wavefront sensor. This on-sky data will inform the development of the AGWS phasing camera design towards the GMT first light.

Original language	English (US)
Title of host publication	Adaptive Optics for Extremely Large Telescopes 4 - Conference Proceedings
Publisher	University of California Center for Adaptive Optics
DOIs	https://doi.org/10.20353/K3T4CP1131566
State	Published - 2015
Event	4th Adaptive Optics for Extremely Large Telescopes, AO4ELT 2015 - Lake Arrowhead, United States Duration: Oct 26 2015 → Oct 30 2015

Other

Other	4th Adaptive Optics for Extremely Large Telescopes, AO4ELT 2015
Country	United States
City	Lake Arrowhead
Period	10/26/15 → 10/30/15

Keywords

Active optics
Adaptive optics
Dispersed fringe sensor
Giant Magellan Telescope
Phasing

ASJC Scopus subject areas

Control and Systems Engineering
Instrumentation
Electronic, Optical and Magnetic Materials
Space and Planetary Science
Astronomy and Astrophysics
Mechanical Engineering

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Kopon, D., McLeod, B., McCracken, K., Van Dam, M., Bouchez, A., Conder, A., Podgorski, W., Catropa, D., McMuldroch, S., Close, L. M., Males, J., Morzinski, K., & Norton, T. (2015). Prototyping the GMT phasing camera with the Magellan AO system. In Adaptive Optics for Extremely Large Telescopes 4 - Conference Proceedings University of California Center for Adaptive Optics. https://doi.org/10.20353/K3T4CP1131566

Prototyping the GMT phasing camera with the Magellan AO system. / Kopon, Derek; McLeod, Brian; McCracken, Kenneth; Van Dam, Marcos; Bouchez, Antonin; Conder, Alan; Podgorski, William; Catropa, Daniel; McMuldroch, Stuart; Close, Laird M; Males, Jared; Morzinski, Katie; Norton, Timothy.

Adaptive Optics for Extremely Large Telescopes 4 - Conference Proceedings. University of California Center for Adaptive Optics, 2015.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Kopon, D, McLeod, B, McCracken, K, Van Dam, M, Bouchez, A, Conder, A, Podgorski, W, Catropa, D, McMuldroch, S, Close, LM, Males, J, Morzinski, K & Norton, T 2015, Prototyping the GMT phasing camera with the Magellan AO system. in Adaptive Optics for Extremely Large Telescopes 4 - Conference Proceedings. University of California Center for Adaptive Optics, 4th Adaptive Optics for Extremely Large Telescopes, AO4ELT 2015, Lake Arrowhead, United States, 10/26/15. https://doi.org/10.20353/K3T4CP1131566

Kopon, Derek ; McLeod, Brian ; McCracken, Kenneth ; Van Dam, Marcos ; Bouchez, Antonin ; Conder, Alan ; Podgorski, William ; Catropa, Daniel ; McMuldroch, Stuart ; Close, Laird M ; Males, Jared ; Morzinski, Katie ; Norton, Timothy. / Prototyping the GMT phasing camera with the Magellan AO system. Adaptive Optics for Extremely Large Telescopes 4 - Conference Proceedings. University of California Center for Adaptive Optics, 2015.

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abstract = "The future diffraction-limited performance of the 25.4 meter Giant Magellan Telescope (GMT) will rely on the active and adaptive wavefront sensing measurements made by the Acquisition, Guiding, and Wavefront Sensor (AGWS) currently being designed by SAO. One subsystem of the AGWS, the phasing camera, will be responsible for measuring the piston phase difference between the seven GMT primary/secondary segment pairs to 50 nm accuracy with full sky coverage using natural guide stars that are 6-10 arcmin off-axis while the on-axis light is used for science operations. The phasing camera will use a dispersed fringe sensor to measure the phase difference in rectangular subapertures spanning the gaps between adjacent mirror segments. The large gap between segments (>295 mm, compared to 3 mm for the Keck telescope) reduces the coherence of light across the subapertures, making this problem particularly challenging. In support of the AGWS phasing camera technical goals, SAO has undertaken a series of prototyping efforts at the Magellan 6.5 meter Clay telescope to demonstrate the dispersed fringe sensor technology and validate atmospheric models. Our latest on-sky test, completed in December 2015, employs a dual-band (I and J) dispersed fringe sensor. This prototype uses an adaptive optics corrected beam from the Magellan AO adaptive secondary system. The system operates both on-axis and 6 arcmin off-axis from the natural guide star feeding the MagAO wavefront sensor. This on-sky data will inform the development of the AGWS phasing camera design towards the GMT first light.",

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