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

doi:10.1117/12.2231782

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 proceeding › Conference contribution

2 Scopus citations

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.

Original language	English (US)
Title of host publication	Software and Cyberinfrastructure for Astronomy IV
Editors	Gianluca Chiozzi, Juan C. Guzman
Publisher	SPIE
ISBN (Electronic)	9781510602052
DOIs	https://doi.org/10.1117/12.2231782
State	Published - 2016
Externally published	Yes
Event	Software and Cyberinfrastructure for Astronomy IV - Edinburgh, United Kingdom Duration: Jun 26 2016 → Jun 30 2016

Publication series

Name	Proceedings of SPIE - The International Society for Optical Engineering
Volume	9913
ISSN (Print)	0277-786X
ISSN (Electronic)	1996-756X

Conference

Conference	Software and Cyberinfrastructure for Astronomy IV
Country/Territory	United Kingdom
City	Edinburgh
Period	6/26/16 → 6/30/16

Keywords

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

Access to Document

10.1117/12.2231782

Cite this

Rippa, M. J., Bonnet, H., Hayward, T. L., Trujillo, C., Cavedoni, C. P., Cumming, T., Yamasaki, C., Masuda, N., Bagano, C., & Hardash, S. (2016). Rejecting harmonic vibrations at Gemini with real-time vibration tracking. In G. Chiozzi, & J. C. Guzman (Eds.), Software and Cyberinfrastructure for Astronomy IV [99132M] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 9913). SPIE. https://doi.org/10.1117/12.2231782

Rejecting harmonic vibrations at Gemini with real-time vibration tracking. / Rippa, Mathew J.; Bonnet, Henri; Hayward, Thomas L. et al.
Software and Cyberinfrastructure for Astronomy IV. ed. / Gianluca Chiozzi; Juan C. Guzman. SPIE, 2016. 99132M (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 9913).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Rippa, MJ, Bonnet, H, Hayward, TL, Trujillo, C, Cavedoni, CP, Cumming, T, Yamasaki, C, Masuda, N, Bagano, C & Hardash, S 2016, Rejecting harmonic vibrations at Gemini with real-time vibration tracking. in G Chiozzi & JC Guzman (eds), Software and Cyberinfrastructure for Astronomy IV., 99132M, Proceedings of SPIE - The International Society for Optical Engineering, vol. 9913, SPIE, Software and Cyberinfrastructure for Astronomy IV, Edinburgh, United Kingdom, 6/26/16. https://doi.org/10.1117/12.2231782

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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.",

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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",

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N2 - 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.

AB - 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.

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Rejecting harmonic vibrations at Gemini with real-time vibration tracking

Abstract

Publication series

Conference

Keywords

ASJC Scopus subject areas

Access to Document

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Cite this