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  The output mode cleaner of GEO 600

Prijatelj, M., Degallaix, J., Grote, H., Leong, J., Affeldt, C., Hild, S., et al. (2012). The output mode cleaner of GEO 600. Classical and quantum gravity, 29(5): 055009. doi:10.1088/0264-9381/29/5/055009.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-000E-B049-5 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-000E-B04B-1
Genre: Journal Article

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Prijatelj, M.1, Author              
Degallaix, J.1, Author              
Grote, H.1, Author              
Leong, J.2, Author              
Affeldt, C.1, Author              
Hild, S.1, Author              
Luck, H.1, Author              
Slutsky, J.1, Author
Wittel, H.1, Author              
Strain, K. A.1, Author              
Danzmann, K.1, Author              
Affiliations:
1Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, escidoc:24010              
2Observational Relativity and Cosmology, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, escidoc:24011              

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 Abstract: The German–British interferometric gravitational wave detector GEO 600 is currently undergoing upgrades within the GEO-HF upgrade program. The goal of this program is to enhance the sensitivity of GEO 600, in particular at frequencies above 500 Hz. At these frequencies, the detector is limited by shot noise. An important element of the upgrade is the implementation of an output mode cleaner (OMC). This filtering cavity suppresses higher order spatial and temporal modes in the interferometer's output beam, thereby reducing the shot noise and enhancing sensitivity. Fully automated lock acquisition for the OMC was developed in order to ensure a high duty cycle of GEO 600. To maintain optimum sensitivity, the resonance condition of the OMC must be matched to the output beam from the interferometer. This requires continuous control of the resonance frequency of the OMC to the light, and alignment of the beam to the OMC. We describe the design and implementation of the OMC with special attention to the control techniques employed. We present results from the experience gained during the S6/VSR3 science run. Furthermore, we describe an upper limit measurement of the internal displacement noise of a piezoelectric actuator.

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 Dates: 2012
 Publication Status: Published in print
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 Identifiers: DOI: 10.1088/0264-9381/29/5/055009
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Title: Classical and quantum gravity
Source Genre: Journal
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Publ. Info: Bristol, U.K. : Institute of Physics
Pages: - Volume / Issue: 29 (5) Sequence Number: 055009 Start / End Page: - Identifier: ISSN: 0264-9381
CoNE: http://pubman.mpdl.mpg.de/cone/journals/resource/954925513480_1