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Proceedings Paper

Maintenance and operation of the adaptive optics module for NICI, the high-contrast coronagraphic imager of GEMINI observatory
Author(s): Markus Hartung; Tom L. Hayward; M. Chun; A. Kellerer
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Paper Abstract

NICI, the high-contrast coronagraphic imager of Gemini observatory, primarily dedicated to planet hunting has been offered to the astronomical community since end of 2008. We present our experiences in operating and maintaining NICI's 85 element curvature adaptive optics (AO) system. A detailed study of NICI AO telemetry data is also most relevant to prepare the arrival of next generation instruments. We summarize the behavior of interaction matrices, control matrices and error transfer functions under different operational conditions; a detailed understanding of the system helps monitoring and optimizing performance. Furthermore, we describe tuning (membrane mirror stroke/extra focal distance) for non-optimal seeing conditions as well as for niche applications of NICI such as observing small moons and asteroids. We compare on-sky measurements to theory or simulations.

Paper Details

Date Published: 28 July 2010
PDF: 12 pages
Proc. SPIE 7736, Adaptive Optics Systems II, 77362K (28 July 2010); doi: 10.1117/12.858054
Show Author Affiliations
Markus Hartung, Gemini Observatory (Chile)
Tom L. Hayward, Gemini Observatory (Chile)
M. Chun, Institute for Astronomy, Univ. of Hawai'i (United States)
A. Kellerer, Institute for Astronomy, Univ. of Hawai'i (United States)

Published in SPIE Proceedings Vol. 7736:
Adaptive Optics Systems II
Brent L. Ellerbroek; Michael Hart; Norbert Hubin; Peter L. Wizinowich, Editor(s)

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