@inproceedings{20c1d0e797fe42a3a0c545d138861137,
title = "Rejecting harmonic vibrations at Gemini with real-time vibration tracking",
abstract = "Fighting vibrations on large telescopes is an arduous task. At Gemini, vibrations originating from cryogenic coolers have been shown to degrade the optical wavefront, in certain cases by as much as 40%. This paper discusses a general solution to vibration compensation by tracking the real time vibration state of the telescope and using M2 to apply corrections. Two approaches are then presented: an open loop compensation at M2 based on the signal of accelerometers at the M1 glass, and a closed loop compensation at M2 based on optical measurements from the wave front sensor. The paper elaborates on the pros and cons of each approach and the challenges faced during commissioning. A conclusion is presented with the final results of vibration tracking integrated with operations.",
keywords = "Control, M2, Realtime, Vibration, WFS",
author = "Rippa, {Mathew J.} and Henri Bonnet and Hayward, {Thomas L.} and Chadwick Trujillo and Cavedoni, {Chas P.} and Tom Cumming and Chris Yamasaki and Neal Masuda and Cy Bagano and Steve Hardash",
note = "Funding Information: We thank the staff members of Gemini Observatory for their excellent and enthusiastic support of the many tests required for this longterm program. The Gemini Observatory is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministerio da Ciencia, Tecnologia e Inovacao (Brazil) and Ministerio de Ciencia, Tecnologia e Innovacion Productiva (Argentina) Publisher Copyright: {\textcopyright} COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.; Software and Cyberinfrastructure for Astronomy IV ; Conference date: 26-06-2016 Through 30-06-2016",
year = "2016",
doi = "10.1117/12.2231782",
language = "English (US)",
series = "Proceedings of SPIE - The International Society for Optical Engineering",
publisher = "SPIE",
editor = "Gianluca Chiozzi and Guzman, {Juan C.}",
booktitle = "Software and Cyberinfrastructure for Astronomy IV",
}