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  Feedforward correction of mirror misalignment fluctuations for the GEO 600 gravitational wave detector

Smith, J. R., Grote, H., Hewitson, M., Hild, S., Lück, H., Parsons, M., et al. (2005). Feedforward correction of mirror misalignment fluctuations for the GEO 600 gravitational wave detector. Classical and Quantum Gravity, 22(14), 3093-3104.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-4DFB-2 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-4DFD-D
Genre: Journal Article

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5_14_018.pdf (Publisher version), 305KB
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 Creators:
Smith, J. R.1, Author
Grote, Hartmut2, Author              
Hewitson, Martin3, Author              
Hild, Stefan2, Author              
Lück, Harald2, Author              
Parsons, M., Author
Strain, Kenneth A.2, Author              
Willke, Benno2, Author              
Affiliations:
1External Organizations, ou_persistent13              
2Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, ou_24010              
3Observational Relativity and Cosmology, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, ou_24011              

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 Abstract: The core instrument of the GEO 600 gravitational wave detector is a Michelson interferometer with folded arms. The five main optics that form this interferometer are suspended in vacuum by triple pendulums with quasi-monolithic lower stages of fused silica. After installation of these pendulums in early 2003, a larger than expected coupling of longitudinal ground motion to tilt misalignment of the suspended optics was observed. Because of this, the uncontrolled misalignment of the optics during average conditions was several µrad Hz-1/2 in the frequency band around the pendulum resonance frequencies (0.5–4 Hz). In addition, it was found that longitudinal control signals applied to the intermediate pendulum stages also resulted in excessive mirror tilt. The resulting misalignment exceeded the level tolerable for stable operation of GEO 600. In order to reduce the level of mirror tilt, a bipartite feedforward system was implemented. One part feeds signals derived from seismic measurements to piezo-electric crystals in the stacks supporting the suspensions, reducing the longitudinal motion of the uppermost suspension points. The other applies tilt correction signals, derived from longitudinal control signals, to the intermediate level of the suspensions. The seismic feedforward correction reduces the root-mean-squared tilt misalignment of each main optic between 0.1 and 5 Hz by about 10 dB, typically. The intermediate-mass feedforward correction reduces the differential tilt misalignment of the Michelson interferometer by about 10 dB between 0.1 and 0.8 Hz, typically.

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Language(s): eng - English
 Dates: 2005-07-21
 Publication Status: Published in print
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 Identifiers: eDoc: 251045
ISI: 000231036000020
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Title: Classical and Quantum Gravity
  Alternative Title : Class. Quantum Gravity
Source Genre: Journal
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Pages: - Volume / Issue: 22 (14) Sequence Number: - Start / End Page: 3093 - 3104 Identifier: ISSN: 0264-9381