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Silica suspension and coating developments for Advanced LIGO

Cagnoli, G. and Armandula, H. and Cantley, C. A. and Crooks, D. R. M. and Cumming, A. and Elliffe, E. and Fejer, M. M. and Gretarsson, A. M. and Harry, G. M. and Heptonstall, A. and Hough, J. and Jones, R. and Mackowski, J.-M. and Martin, I. and Murray, P. and Penn, S. D. and Perreur-Lloyd, M. and Reid, S. and Route, R. and Rowan, S. and Robertson, N. A. and Sneddon, P. H. and Strain, K. A. (2006) Silica suspension and coating developments for Advanced LIGO. Journal of Physics: Conference Series, 32 (1). pp. 386-392. ISSN 1742-6596. http://resolver.caltech.edu/CaltechAUTHORS:CAGjpcs06

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Abstract

The proposed upgrade to the LIGO detectors to form the Advanced LIGO detector system is intended to incorporate a low thermal noise monolithic fused silica final stage test mass suspension based on developments of the GEO 600 suspension design. This will include fused silica suspension elements jointed to fused silica test mass substrates, to which dielectric mirror coatings are applied. The silica fibres used for GEO 600 were pulled using a Hydrogen-Oxygen flame system. This successful system has some limitations, however, that needed to be overcome for the more demanding suspensions required for Advanced LIGO. To this end a fibre pulling machine based on a CO2 laser as the heating element is being developed in Glasgow with funding from EGO and PPARC. At the moment a significant limitation for proposed detectors like Advanced LIGO is expected to come from the thermal noise of the mirror coatings. An investigation on mechanical losses of silica/tantala coatings was carried out by several labs involved with Advanced LIGO R&D. Doping the tantala coating layer with titania was found to reduce the coating mechanical dissipation. A review of the results is given here.


Item Type:Article
Additional Information:© IOP Publishing Limited 2006. Proceedings of the Sixth Edoardo Amaldi Conference on Gravitational Waves, 20–24 June 2005, Bankoku Shinryoukan, Okinawa, Japan The authors would like to thank colleagues in the LIGO Scientific Collaboration, especially David Shoemaker, for their advice and interest in this work. The authors acknowledge financial support from the following agencies and universities: National Science Foundation (NSF), Particle Physics and Astronomy Research Council (PPARC), European Gravitational Observatory (EGO), the University of Glasgow. The US authors would like to thank the National Science Foundation for their support of this work through grants PHY-0140335 (Syracuse), PHY-0140297 (Stanford) and PHY-0107417 (LIGO Laboratory)
Group:LIGO
Funders:
Funding AgencyGrant Number
Particle Physics and Astronomy Research Council (PPARC)UNSPECIFIED
European Gravitational ObservatoryUNSPECIFIED
University of GlasgowUNSPECIFIED
NSFPHY-0140335
NSFPHY-0140297
NSFPHY-0107417
Issue or Number:1
Record Number:CaltechAUTHORS:CAGjpcs06
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:CAGjpcs06
Alternative URL:http://dx.doi.org/10.1088/1742-6596/32/1/059
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:2687
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:17 Apr 2006
Last Modified:03 Jan 2018 20:09

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