Update on quadruple suspension design for Advanced LIGO
Abstract
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.
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.Additional details
- Eprint ID
- 36159
- Resolver ID
- CaltechAUTHORS:20130104-075005335
- PHY-05 02641
- NSF
- PHY-07 57896
- NSF
- PHY-0107417
- NSF
- Science and Technology Facilities Council (STFC)
- University of Glasgow
- University of Birmingham
- University of Strathclyde
- Rutherford Appleton Laboratory
- Created
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2013-01-04Created from EPrint's datestamp field
- Updated
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2022-07-12Created from EPrint's last_modified field
- Other Numbering System Name
- LIGO document
- Other Numbering System Identifier
- LIGO-P1200056-v3