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

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DOIResolve DOI: http://doi.org/10.1117/12.2057092
AuthorSearch for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for:
TypeArticle
Proceedings titleProceedings of SPIE - The International Society for Optical Engineering
ConferenceAdaptive Optics Systems IV, 22 June 2014 through 27 June 2014
ISSN0277-786X
ISBN9780819496164
Volume9148
Article number91480K
SubjectWavefronts; Gemini Planet Imager; LQG control; Modal gain; Wave front reconstruction; Wave front sensors; Adaptive optics
AbstractThe 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
AffiliationNational Research Council Canada; National Science Infrastructure
Peer reviewedYes
NPARC number21275550
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Record identifieraa0203ab-c691-4617-a2a8-bdecf33a231a
Record created2015-07-14
Record modified2016-05-09
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