Investigation of mechanical dissipation in CO2 laser-drawn fused silica fibres and welds

Heptonstall, A. et al. (2010) Investigation of mechanical dissipation in CO2 laser-drawn fused silica fibres and welds. Classical and Quantum Gravity, 27(3), 035013. (doi: 10.1088/0264-9381/27/3/035013)

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Abstract

The planned upgrades to the LIGO gravitational wave detectors include monolithic mirror suspensions to reduce thermal noise. The mirrors will be suspended using CO<sub>2</sub> laser-drawn fused silica fibres. We present here measurements of mechanical dissipation in synthetic fused silica fibres drawn using a CO<sub>2</sub> laser. The level of dissipation in the surface layer is investigated and is found to be at a similar level to fibres produced using a gas flame. Also presented is a method for examining dissipation at welded interfaces, showing clear evidence of the existence of this loss mechanism which forms an additional component of the total detector thermal noise. Modelling of a typical detector suspension configuration shows that the thermal noise contribution from this loss source will be negligible.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Cantley, Dr Caroline and Rowan, Professor Sheila and Kumar, Mr Rahul and Martin, Dr Iain and Cumming, Dr Alan and Hough, Professor James and Torrie, Dr Calum and Jones, Mr Russell
Authors: Heptonstall, A., Barton, M., Cantley, C., Cumming, A., Cagnoli, G., Hough, J., Jones, R., Kumar, R., Martin, I., Rowan, S., Torrie, C., and Zech, S.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Classical and Quantum Gravity
Publisher:Institute of Physics
ISSN:0264-9381
ISSN (Online):1361-6382

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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