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Proceedings Paper

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

Paper Details

Date Published: 7 August 2014
PDF: 12 pages
Proc. SPIE 9148, Adaptive Optics Systems IV, 91480N (7 August 2014); doi: 10.1117/12.2057200
Show Author Affiliations
Markus Hartung, Gemini Observatory (Chile)
Tom Hayward, Gemini Observatory (Chile)
Les Saddlemyer, NRC - Herzburg Institute of Astrophysics (Canada)
Lisa Poyneer, Lawrence Livermore National Lab. (United States)
Andrew Cardwell, Gemini Observatory (Chile)
Chas Cavedoni, Gemini Observatory (United States)
Myung Cho, National Optical Astronomy Observatory (United States)
Jeffrey K. Chilcote, Univ. of California, Los Angeles (United States)
Paul Collins, Gemini Observatory (Chile)
Daren Dillon, Univ. of California, Santa Cruz (United States)
Ramon Galvez, Gemini Observatory (Chile)
Gaston Gausachs, Gemini Observatory (Chile)
Stephen Goodsell, Gemini Observatory (United States)
Andrés Guesalaga, Pontificia Univ. Católica de Chile (Chile)
Pascale Hibon, Gemini Observatory (Chile)
James Larkin, Univ. of California, Los Angeles (United States)
Bruce Macintosh, Kavli Institute for Particle Astrophysics and Cosmology, Stanford Univ. (United States)
Dave Palmer, Lawrence Livermore National Lab. (United States)
Naru Sadakuni, Gemini Observatory (Chile)
Dmitry Savransky, Lawrence Livermore National Lab. (United States)
Andrew Serio, Gemini Observatory (Chile)
Fredrik Rantakyrö, Gemini Observatory (Chile)
Kent Wallace, Jet Propulsion Lab. (United States)

Published in SPIE Proceedings Vol. 9148:
Adaptive Optics Systems IV
Enrico Marchetti; Laird M. Close; Jean-Pierre Véran, Editor(s)

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