On-sky performance during verification and commissioning of the Gemini Planet Imager's adaptive optics system

From National Research Council Canada

DOIResolve DOI: https://doi.org/10.1117/12.2057092
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Name affiliation
  1. National Research Council of Canada. National Science Infrastructure
FormatText, Article
Proceedings titleAdaptive Optics Systems IV
Series titleProceedings of SPIE; no. 9148
ConferenceAdaptive Optics Systems IV, June 22-27, 2014
ISSN0277-786X
1996-756X
ISBN9780819496164
Article number91480K
SubjectWavefronts; Gemini Planet Imager; LQG control; Modal gain; Wave front reconstruction; Wave front sensors; Adaptive optics
Abstract
The Gemini Planet Imager instrument's adaptive optics (AO) subsystem was designed specifically to facilitate high-contrast imaging. It features several new technologies, including computationally efficient wavefront reconstruction with the Fourier transform, modal gain optimization every 8 seconds, and the spatially filtered wavefront sensor. It also uses a Linear-Quadratic-Gaussian (LQG) controller (aka Kalman filter) for both pointing and focus. We present on-sky performance results from verification and commissioning runs from December 2013 through May 2014. The efficient reconstruction and modal gain optimization are working as designed. The LQG controllers effectively notch out vibrations. The spatial filter can remove aliases, but we typically use it oversized by about 60% due to stability problems.
Publication date
PublisherSPIE
LanguageEnglish
Peer reviewedYes
NPARC number21275550
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Record created2015-07-14
Record modified2020-04-22
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