Violin mode amplitude glitch monitor for the presence of excess noise on the monolithic silica suspensions of GEO 600

Sorazu, B. , Strain, K.A. , Heng, I.S. and Kumar, R. (2010) Violin mode amplitude glitch monitor for the presence of excess noise on the monolithic silica suspensions of GEO 600. Classical and Quantum Gravity, 27(15), p. 155017. (doi: 10.1088/0264-9381/27/15/155017)

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Non-Gaussian features of data from gravitational wave detectors are of interest as unpredictable 'glitches' limit the sensitivity of searches for many kinds of signal. We consider events due to non-random excitations of the test masses and their suspension fibres. These events could, for example, be related to acoustic emissions in the fibres due to the presence and propagation of cracks or another type of structural perturbation, and they would generate excess noise above the Gaussian background, which matches the level expected due to thermal noise. We look for excess noise in the fundamental violin modes of the monolithic silica suspension fibres of GEO 600. We describe the algorithm used to monitor the violin mode amplitude for glitches, present our results and consider how these may be applied to advanced detectors. The conclusion of our analysis is that no excess noise above what was considered to be thermal noise was observed for several days of h(t) data analysed at the frequency of the selected violin modes

Item Type:Articles
Glasgow Author(s) Enlighten ID:Sorazu Lucio, Dr Borja and Heng, Professor Ik Siong and Kumar, Mr Rahul and Strain, Professor Kenneth
Authors: Sorazu, B., Strain, K.A., Heng, I.S., and Kumar, R.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Classical and Quantum Gravity
Publisher:Institute of Physics Publishing Ltd.
ISSN (Online):1361-6382
Published Online:24 June 2010

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
337921UK involvement in advanced LIGOKenneth StrainParticle Physics & Astronomy Research Council (PPARC)ST/G504284/1Physics and Astronomy
459312Investigations in Gravitational Radiation.Sheila RowanScience & Technologies Facilities Council (STFC)ST/I001085/1Physics and Astronomy