Finite element modelling of the mechanical loss of silica suspension fibres for advanced gravitational wave detectors
Detection of gravitational waves remains one of the most challenging problems faced by experimental physicists. One of the most significant limits to the sensitivity of current, and future, long-baseline interferometric gravitational wave detectors is thermal displacement noise of the test masses and their suspensions. Detector suspension thermal noise will be an important noise source at operating frequencies between approximately 10 and 30 Hz, and results from a combination of thermoelastic damping, surface and bulk losses associated with the suspension fibres. However its effects can be reduced by minimizing the thermoelastic loss and optimization of pendulum dilution factor via appropriate choice of suspension fibre and attachment geometry. This paper will discuss finite element modelling and associated analysis of the loss in quasi-monolithic silica fibre suspensions for future advanced gravitational wave detectors.
© 2009 IOP Publishing Ltd. Received 23 July 2009. Published 16 October 2009. We would like to thank our colleagues in the GEO600 project, the LSC-Virgo collaboration and within SUPA for their interest in this work. We are grateful for the financial support provided by Science and Technology Facilities Council (STFC), the Leverhulme Trust, the Scottish Funding Council (SFC) and the University of Glasgow in the UK. We would also like to thank the NSF in the USA (award nos. PHY-05 02641 and PHY-07 57896) and STREGA under EC contract no. RII3-CT-2004-506222. LIGO was constructed by the California Institute of Technology and Massachusetts Institute of Technology with funding from the National Science Foundation, and operates under cooperative agreement PHY-0107417. We would like to thank our colleagues in the LSC and VIRGO collaborations and within SUPA for their interest in this work. This paper has LIGO document number LIGO-P0900084.