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ID: 334866.0, MPI für Gravitationsphysik / Laser Interferometry & Gravitational Wave Astronomy
Charge measurement and mitigation for the main test masses of the GEO 600 gravitational wave observatory
Authors:Hewitson, Martin; Danzmann, Karsten; Grote, Hartmut; Hild, Stefan; Hough, J.; Lück, Harald; Rowan, S.; Smith, J. R.; Strain, Ken A.; Willke, Benno
Date of Publication (YYYY-MM-DD):2007-12-21
Title of Journal:Classical and Quantum Gravity
Issue / Number:24
Start Page:6379
End Page:6391
Review Status:not specified
Audience:Not Specified
Abstract / Description: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.
External Publication Status:published
Document Type:Article
Communicated by:Karsten Danzmann
Affiliations:MPI für Gravitationsphysik/Laser Interferometry & Gravitational Wave Astronomy
MPI für Gravitationsphysik/Teilinstitut Hannover
MPI für Gravitationsphysik/Observational Relativity and Cosmology
Identifiers:ISI:000251428600014 [ID No:1]
ISSN:0264-9381 [ID No:2]
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