On-sky vibration environment for the Gemini Planet Imager and mitigation effort

From National Research Council Canada

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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 number91480N
SubjectKalman filters; Telescopes; Extreme adaptive optics; High contrast imaging; Integral field spectrograph; LQG; Specific frequencies; Telescope structures; Vibration absorber; Vibration environment; Adaptive optics
Abstract
The Gemini Planet Imager (GPI) entered on-sky commissioning and had its first-light at the Gemini South (GS) telescope in November 2013. GPI is an extreme adaptive optics (XAO), high-contrast imager and integral-field spectrograph dedicated to the direct detection of hot exo-planets down to a Jupiter mass. The performance of the apodized pupil Lyot coronagraph depends critically upon the residual wavefront error (design goal of 60nmRMS with <5 mas RMS tip/tilt), and therefore is most sensitive to vibration (internal or external) of Gemini's instrument suite. Excess vibration can be mitigated by a variety of methods such as passive or active dampening at the instrument or telescope structure or Kalman filtering of specific frequencies with the AO control loop. Understanding the sources, magnitudes and impact of vibration is key to mitigation. This paper gives an overview of related investigations based on instrument data (GPI AO module) as well as external data from accelerometer sensors placed at different locations on the GS telescope structure. We report the status of related mitigation efforts, and present corresponding results.
Publication date
PublisherSPIE
LanguageEnglish
Peer reviewedYes
NPARC number21275485
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