Update on quadruple suspension design for advanced LIGO

Aston, S.M. et al. (2012) Update on quadruple suspension design for advanced LIGO. Classical and Quantum Gravity, 29(23), Art. 235004. (doi: 10.1088/0264-9381/29/23/235004)

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.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Heptonstall, Dr Alastair and Beveridge, Miss Nicola and Bell, Dr Angus and Hammond, Professor Giles and Reid, Professor Stuart and Tokmakov, Dr Kirill and Plissi, Dr Michael and van Veggel, Dr Marielle and Torrie, Dr Calum and Cagnoli, Dr Gianpietro and Cantley, Dr Caroline and Rowan, Professor Sheila and Kumar, Mr Rahul and Martin, Dr Iain and Robertson, Professor Norna and Cumming, Dr Alan and Cunningham, Dr Liam and Hough, Professor James and Strain, Professor Kenneth and Jones, Mr Russell and Haughian, Dr Karen and Murray, Dr Peter and Barton, Dr Mark
• Authors: Aston, S.M., Barton, M.A., Bell, A.S., Beveridge, N., Bland, B., Brummitt, A.J., Cagnoli, G., Cantley, C.A., Carbone, L., Cumming, A.V., Cunningham, L., Cutler, R.M., Greenhalgh, R.J.S., Hammond, G.D., Haughian, K., Hayler, T.M., Heptonstall, A., Heefner, J., Hoyland, D., Hough, J., Jones, R., Kissel, J.S., Kumar, R., Lockerbie, N.A., Lodhia, D., Martin, I.W., Murray, P.G., O’Dell, J., Plissi, M., Reid, S., Romie, J., Robertson, N.A., Rowan, S., Shapiro, B., Speake, C.C.,, Strain, K.A., Tokmakov, K.V., Torrie, C., van Veggel, A.A., Vecchio, A., and Wilmut, I.
• Subjects: Q Science > QC Physics
• College/School: College of Science and Engineering > School of Physics and Astronomy
• Research Centre: College of Science and Engineering > School of Physics and Astronomy > Institute for Gravitational Research
• Journal Name: Classical and Quantum Gravity
• ISSN: 0264-9381
• ISSN (Online): 1361-6382

Project Code	Award No	Project Name	Principal Investigator	Funder's Name	Funder Ref	Lead Dept
45931	3	Investigations in Gravitational Radiation.	Sheila Rowan	Science & Technologies Facilities Council (STFC)	ST/J000361/1	P&A - PHYSICS & ASTRONOMY