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

Markus Hartung; Tom Hayward; Les Saddlemyer; Lisa Poyneer; Andrew Cardwell; Chas Cavedoni; Myung Cho; Jeffrey K. Chilcote; Paul Collins; Daren Dillon; Ramon Galvez; Gaston Gausachs; Stephen Goodsell; Andrés Guesalaga; Pascale Hibon; James Larkin; Bruce Macintosh; Dave Palmer; Naru Sadakuni; Dmitry Savransky; Andrew Serio; Fredrik Rantakyrö; Kent Wallace

doi:10.1117/12.2057200

7 August 2014 On-sky vibration environment for the Gemini Planet Imager and mitigation effort

Markus Hartung, Tom Hayward, Les Saddlemyer, Lisa Poyneer, Andrew Cardwell, Chas Cavedoni, Myung Cho, Jeffrey K. Chilcote, Paul Collins, Daren Dillon, Ramon Galvez, Gaston Gausachs, Stephen Goodsell, Andrés Guesalaga, Pascale Hibon, James Larkin, Bruce Macintosh, Dave Palmer, Naru Sadakuni, Dmitry Savransky, Andrew Serio, Fredrik Rantakyrö, Kent Wallace,

Author Affiliations +

Proceedings Volume 9148, Adaptive Optics Systems IV; 91480N (2014) https://doi.org/10.1117/12.2057200
Event: SPIE Astronomical Telescopes + Instrumentation, 2014, Montréal, Quebec, Canada

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.

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Markus Hartung, Tom Hayward, Les Saddlemyer, Lisa Poyneer, Andrew Cardwell, Chas Cavedoni, Myung Cho, Jeffrey K. Chilcote, Paul Collins, Daren Dillon, Ramon Galvez, Gaston Gausachs, Stephen Goodsell, Andrés Guesalaga, Pascale Hibon, James Larkin, Bruce Macintosh, Dave Palmer, Naru Sadakuni, Dmitry Savransky, Andrew Serio, Fredrik Rantakyrö, Kent Wallace, and "On-sky vibration environment for the Gemini Planet Imager and mitigation effort", Proc. SPIE 9148, Adaptive Optics Systems IV, 91480N (7 August 2014); https://doi.org/10.1117/12.2057200

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