LIGO Document P1200056-v3
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/rt 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.
For full list of authors see document.
- v3 is revised version of paper resubmitted following comments from referees.
*Paper accepted for publication 25 Sept 2012*
Accepted version contains a few edits/corrections relative to the v3 version uploaded here.
Paper was published online on 22nd October 2012.
Bibliographic details are
Class. Quantum Grav. 29 (2012) 235004
DCC Version 3.4.0, contact
Document Database Administrators