Automatic beam alignment for the mode-cleaner cavities of GEO 600

Hartmut Grote; Gerhard Heinzel; Andreas Freise; Stefan Goßler; Benno Willke; Harald Lück; Harry Ward; Morag M. Casey; Kenneth A. Strain; David Robertson; Jim Hough; Karsten Danzmann

doi:10.1364/AO.43.001938

Automatic beam alignment for the mode-cleaner cavities of GEO 600

Hartmut Grote^*, Gerhard Heinzel, Andreas Freise, Stefan Goßler, Benno Willke, Harald Lück, Harry Ward, Morag M. Casey, Kenneth A. Strain, David Robertson, Jim Hough, Karsten Danzmann

^*Corresponding author for this work

Research output: Contribution to Journal › Article › Academic › peer-review

Abstract

The automatic alignment system for the two suspended, triangular mode-cleaner cavities of the gravitational wave detector GEO 600 has been in continuous operation since the spring of 2001. A total of 20 angular degrees of freedom are controlled by feedback loops with almost no manual alignment having been required since installation. Error signals for the eight most important degrees of freedom are obtained with the differential wave-front sensing technique. We describe the sensing system, the control topology, and the performance of the automatic alignment system. A continuous locking stretch of more than 120 h has been achieved.

Original language	English
Pages (from-to)	1938-1945
Number of pages	8
Journal	Applied Optics
Volume	43
Issue number	9
DOIs	https://doi.org/10.1364/AO.43.001938
Publication status	Published - 20 Mar 2004
Externally published	Yes

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title = "Automatic beam alignment for the mode-cleaner cavities of GEO 600",

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T1 - Automatic beam alignment for the mode-cleaner cavities of GEO 600

AU - Grote, Hartmut

AU - Heinzel, Gerhard

AU - Freise, Andreas

AU - Goßler, Stefan

AU - Willke, Benno

AU - Lück, Harald

AU - Ward, Harry

AU - Casey, Morag M.

AU - Strain, Kenneth A.

AU - Robertson, David

AU - Hough, Jim

AU - Danzmann, Karsten

PY - 2004/3/20

Y1 - 2004/3/20

N2 - The automatic alignment system for the two suspended, triangular mode-cleaner cavities of the gravitational wave detector GEO 600 has been in continuous operation since the spring of 2001. A total of 20 angular degrees of freedom are controlled by feedback loops with almost no manual alignment having been required since installation. Error signals for the eight most important degrees of freedom are obtained with the differential wave-front sensing technique. We describe the sensing system, the control topology, and the performance of the automatic alignment system. A continuous locking stretch of more than 120 h has been achieved.

AB - The automatic alignment system for the two suspended, triangular mode-cleaner cavities of the gravitational wave detector GEO 600 has been in continuous operation since the spring of 2001. A total of 20 angular degrees of freedom are controlled by feedback loops with almost no manual alignment having been required since installation. Error signals for the eight most important degrees of freedom are obtained with the differential wave-front sensing technique. We describe the sensing system, the control topology, and the performance of the automatic alignment system. A continuous locking stretch of more than 120 h has been achieved.

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Automatic beam alignment for the mode-cleaner cavities of GEO 600

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