A Caltech Library Service

Update on quadruple suspension design for Advanced LIGO

Aston, S. M. and Heptonstall, A. and Heefner, J. and Robertson, N. A. and Torrie, C. (2012) Update on quadruple suspension design for Advanced LIGO. Classical and Quantum Gravity, 29 (23). Art. No. 235004. ISSN 0264-9381.

Full text is not posted in this repository. Consult Related URLs below.

Use this Persistent URL to link to this item:


We describe the design of the suspension systems for the major optics for Advanced LIGO, the upgrade to LIGO—the Laser Interferometric Gravitational-Wave Observatory. The design is based on that used in GEO600—the German/UK interferometric gravitational wave detector, with further development to meet the more stringent noise requirements for Advanced LIGO. The test mass suspensions consist of a four-stage or quadruple pendulum for enhanced seismic isolation. To minimize suspension thermal noise, the final stage consists of a silica mirror, 40 kg in mass, suspended from another silica mass by four silica fibres welded to silica ears attached to the sides of the masses using hydroxide-catalysis bonding. The design is chosen to achieve a displacement noise level for each of the seismic and thermal noise contributions of 10^(−19) m/√Hz at 10 Hz, for each test mass. We discuss features of the design which has been developed as a result of experience with prototypes and associated investigations.

Item Type:Article
Related URLs:
Additional Information:© 2012 Institute of Physics Publishing Ltd. Received 18 June 2012, in final form 8 September 2012. Published 22 October 2012. The authors wish to acknowledge the many colleagues in LIGO and the LIGO Scientific Collaboration who have supported this work. In particular we acknowledge the outstanding work of the suspensions mechanical and electronics assembly, installation and testing teams at the LIGO Hanford and LIGO Livingston observatories, Caltech and MIT, and also members of the LASTI staff at MIT who supported the prototype work there. In addition the work would not have been possible without the support of LIGO management, procurement and quality assurance teams, and colleagues in other subsystems of Advanced LIGO including systems, seismic, core optics, facilities management and control and data systems. We also acknowledge the inputs from colleagues who have given feedback and made suggestions for improvements to the design, both formally at the various design reviews over the last few years and informally as issues arose. We would like to thank the National Science Foundation in the USA (award nos. PHY-05 02641 and PHY-07 57896). 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. In the UK, we are grateful for the financial support provided by Science and Technology Facilities Council (STFC), the University of Glasgow, the University of Birmingham, the University of Strathclyde and the Rutherford Appleton Laboratory. This paper has LIGO document number LIGO- P1200056-v3.
Funding AgencyGrant Number
NSFPHY-05 02641
NSFPHY-07 57896
Science and Technology Facilities Council (STFC)UNSPECIFIED
University of GlasgowUNSPECIFIED
University of BirminghamUNSPECIFIED
University of StrathclydeUNSPECIFIED
Rutherford Appleton LaboratoryUNSPECIFIED
Other Numbering System:
Other Numbering System NameOther Numbering System ID
LIGO documentLIGO-P1200056-v3
Issue or Number:23
Classification Code:PACS: 04.80.Nn, 95.55.Ym, 91.30.-f. MSC: 83C35, 86A15
Record Number:CaltechAUTHORS:20130104-075005335
Persistent URL:
Official Citation: Update on quadruple suspension design for Advanced LIGO S M Aston et al 2012 Class. Quantum Grav. 29 235004
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:36159
Deposited By: Ruth Sustaita
Deposited On:04 Jan 2013 16:15
Last Modified:03 Oct 2019 04:35

Repository Staff Only: item control page