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  Charge measurement and mitigation for the main test masses of the GEO 600 gravitational wave observatory

Hewitson, M., Danzmann, K., Grote, H., Hild, S., Hough, J., Lück, H., et al. (2007). Charge measurement and mitigation for the main test masses of the GEO 600 gravitational wave observatory. Classical and Quantum Gravity, 24(24), 6379-6391. doi:10.1088/0264-9381/24/24/013.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-4749-4 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-474C-D
Genre: Journal Article

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cqg7_24_013.pdf (Publisher version), 676KB
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 Creators:
Hewitson, Martin1, Author              
Danzmann, Karsten2, Author              
Grote, Hartmut2, Author              
Hild, Stefan2, Author              
Hough, J., Author
Lück, Harald2, Author              
Rowan, S., Author
Smith, J. R.1, 2, 3, Author
Strain, Ken A.2, Author              
Willke, Benno2, Author              
Affiliations:
1Observational Relativity and Cosmology, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, ou_24011              
2Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, ou_24010              
3AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, ou_24009              

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 Abstract: Spurious charging of the test masses in gravitational wave interferometers is a well-known problem. Typically, concern arises due to the possibility of increased thermal noise due to a lowering of the quality factor of modes of the test-mass suspension, or due to the potential for increased displacement noise arising from charge migration on the surface of the test masses. Recent experience gained at the GEO 600 gravitational wave detector has highlighted an additional problem. GEO 600 uses electrostatic actuators to control the longitudinal position of the main test masses. The presence of charge on the test masses is shown to strongly affect the performance of the electrostatic actuators. This paper reports on a measurement scheme whereby the charge state of the GEO 600 test masses can be measured using the electrostatic actuators. The resulting measurements are expressed in terms of an effective bias voltage on the electrostatic actuators. We also describe attempts to remove the charge from the test masses and we show that the use of UV illumination was the most successful. Using UV illumination we were able to discharge and re-charge the test masses.

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 Dates: 2007-12-21
 Publication Status: Published in print
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 Identifiers: eDoc: 334866
ISI: 000251428600014
DOI: 10.1088/0264-9381/24/24/013
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Title: Classical and Quantum Gravity
Source Genre: Journal
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Pages: - Volume / Issue: 24 (24) Sequence Number: - Start / End Page: 6379 - 6391 Identifier: ISSN: 0264-9381