Rejecting harmonic vibrations at Gemini with real-time vibration tracking

Mathew J. Rippa, Henri Bonnet, Thomas L. Hayward, Chadwick Trujillo, Chas P. Cavedoni, Tom Cumming, Chris Yamasaki, Neal Masuda, Cy Bagano, Steve Hardash

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations


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.

Original languageEnglish (US)
Title of host publicationSoftware and Cyberinfrastructure for Astronomy IV
EditorsGianluca Chiozzi, Juan C. Guzman
ISBN (Electronic)9781510602052
StatePublished - 2016
Externally publishedYes
EventSoftware and Cyberinfrastructure for Astronomy IV - Edinburgh, United Kingdom
Duration: Jun 26 2016Jun 30 2016

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceSoftware and Cyberinfrastructure for Astronomy IV
Country/TerritoryUnited Kingdom


  • Control
  • M2
  • Realtime
  • Vibration
  • WFS

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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