25 October 2004 Evaluation of the on-sky performance of Altair
Author Affiliations +
In this paper we evaluate the on-sky performance of Altair, the facility adaptive optics instrument at the Gemini North telescope. We describe the method for doing this on-sky evaluation, which includes: 1) the choice of suitable stellar fields for PSF observations that must cover a range of guide star magnitudes and angular separations from the guide star; 2) the observation strategy and data reduction pipeline; and 3) the PSF database from which the performance results are queried. The database stores observatory system parameters and performance observations such as FWHM, Strehl, encircled energy, wave front sensor flux, as well as coherence length (ro) and outer scale (Lo) of the turbulence measured in closed loop and therefore coincident with the focal plane observations of the telescope. From the database we derive 20 to 24% Noll efficiency of the system and an estimated distribution of effective turbulence height above the summit to be 3.3 ± 0.6km. The performance evaluation strategy used on Altair is quite general and could be used for other adaptive optics systems.
© (2004) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jeffrey A. Stoesz, Jean-Pierre Veran, Francois J. Rigaut, Glen Herriot, Laurent Jolissaint, Danielle Frenette, Jennifer Dunn, and Malcolm Smith "Evaluation of the on-sky performance of Altair", Proc. SPIE 5490, Advancements in Adaptive Optics, (25 October 2004); doi: 10.1117/12.552493; https://doi.org/10.1117/12.552493


ALTAIR performance and updates at Gemini North
Proceedings of SPIE (July 12 2010)
Sky coverage and PSF shape with LGS AO on 8...
Proceedings of SPIE (September 10 1998)
GeMS first on-sky results
Proceedings of SPIE (September 12 2012)

Back to Top