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  Damping and tuning of the fiber violin modes in monolithic silica suspensions

Gossler, S., Cagnoli, G., Crooks, D. R. M., Lück, H., Rowan, S., Strain, K. A., et al. (2004). Damping and tuning of the fiber violin modes in monolithic silica suspensions. Classical and Quantum Gravity, 21(5), S923-S933. doi:10.1088/0264-9381/21/5/082.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-5147-A Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-5149-6
Genre: Journal Article

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Gossler, Stefan1, Author              
Cagnoli, G.1, 2, Author
Crooks, D. R. M.1, 2, Author
Lück, Harald1, Author              
Rowan, S.1, 2, Author
Strain, Kenneth A.1, Author              
Smith, Joshua R.1, 2, Author
Hough, Jim1, 2, Author
Danzmann, Karsten1, Author              
Affiliations:
1Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, ou_24010              
2AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, ou_24009              

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 Abstract: High Q mirror suspensions are a key element of the advanced interferometric gravitational-wave detectors. In December 2002 the last of the final interferometer optics of GEO 600 were monolithically suspended, using fused silica fibres. The violin modes of the suspension fibres can have Q greater than 108 and can therefore interfere with the interferometer length control servo. Hence, the violin modes need to be damped, without degrading the pendulum Q itself. Furthermore, the frequency spread of the fibres used has to be small to allow for high Q notch filtering in the length control servo. The requirements for the violin modes of the two GEO 600 inboard suspensions are Q < 3 × 106 for the fundamental and Q < 2 × 106 for the first harmonic mode, respectively. The frequency spread should not exceed 10% within one mode. To accomplish that, two sections of the fibres were coated with amorphous Teflon. By applying the coating, the Q of the relevant modes can be degraded to the desired values and furthermore, the frequencies of these modes can be tuned almost independently with a good accuracy over a wide range. After welding the fibres in the monolithic suspension, a corrective coating was applied to some fibres, to compensate for the frequency spread due to the tension spread of the four fibres within a suspension. We present the method and the results achieved.

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Language(s): eng - English
 Dates: 2004
 Publication Status: Published in print
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 Identifiers: eDoc: 119918
DOI: 10.1088/0264-9381/21/5/082
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Title: Classical and Quantum Gravity
Source Genre: Journal
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Pages: - Volume / Issue: 21 (5) Sequence Number: - Start / End Page: S923 - S933 Identifier: ISSN: 0264-9381