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  Thermal Correction of Astigmatism in the Gravitational Wave Observatory GEO 600

Wittel, H., Lück, H., Affeldt, C., Dooley, K., Grote, H., Leong, J., et al. (2014). Thermal Correction of Astigmatism in the Gravitational Wave Observatory GEO 600. Classical and quantum gravity, 31(6): 065008. doi:10.1088/0264-9381/31/6/065008.

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Item Permalink: https://hdl.handle.net/11858/00-001M-0000-001A-003A-6 Version Permalink: https://hdl.handle.net/11858/00-001M-0000-001A-003C-2
Genre: Journal Article

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 Creators:
Wittel, Holger1, Author           
Lück, Harald1, Author           
Affeldt, Christoph1, Author           
Dooley, Kate1, Author           
Grote, Hartmut1, Author           
Leong, Jonathan2, Author           
Prijatelj, Mirko1, Author           
Schreiber, Emil1, Author           
Slutsky, Jacob, Author
Strain, Kenneth A.1, Author           
Was, Michal3, Author           
Willke, Benno1, Author           
Danzmann, Karsten1, Author           
Affiliations:
1Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, ou_24010              
2Observational Relativity and Cosmology, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, ou_24011              
3Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, Hannover, DE, ou_24010              

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Free keywords: Physics, Instrumentation and Detectors, physics.ins-det, Physics, Optics, physics.optics
 Abstract: The output port of GEO 600 is dominated by unwanted high order modes (HOMs). The current thermal actuation system, a ring heater behind one of the folding mirrors, causes a significant amount of astigmatism, which produces HOMs. We have built and installed an astigmatism correction system, based on heating this folding mirror at the sides (laterally). With these side heaters and the ring heater behind the mirror, it is possible to tune its radius of curvature in the horizontal and the vertical degree of freedom. We use this system to match the mirrors in the two arms of GEO 600 to each other, thereby reducing the contrast defect. The use of the side heaters reduces the power of the HOMs at the output of GEO 600 by approximately 37%.

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 Dates: 2013-11-212014
 Publication Status: Issued
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 Identifiers: arXiv: 1311.5367
DOI: 10.1088/0264-9381/31/6/065008
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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: 31 (6) Sequence Number: 065008 Start / End Page: - Identifier: ISSN: 0264-9381
CoNE: https://pure.mpg.de/cone/journals/resource/954925513480_1