Giaime, Joseph and Saha, Partha and Shoemaker, David and Sievers, Lisa (1996) A passive vibration isolation stack for LIGO: Design, modeling, and testing. Review of Scientific Instruments, 67 (1). pp. 208-214. ISSN 0034-6748. http://resolver.caltech.edu/CaltechAUTHORS:GIArsi96
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Multiple-stage seismic vibration isolation stacks, which consist of alternating layers of stiff masses and compliant springs, can provide significant passive filtering of ground vibration for experiments and equipment that are sensitive to mechanical noise. We describe the design, modeling and testing of a prototype of a stack suitable for use in the Laser Interferometer Gravitational-wave Observatory (LIGO). This is a four-stage elastomer (spring) and stainless steel (mass) stack, consisting of a table resting on three separate legs of three layers each. The viscoelastic properties of elastomer springs are exploited to damp the stack's normal modes while providing rapid roll-off of stack transmission above these modal frequencies. The stack's transmission of base motion to top motion was measured in vacuum and compared with three-dimensional finite-element models. In one tested configuration, at 100 Hz, horizontal transmission was 10^–7, vertical transmission was 3×10^–6, and the cross-coupling terms were between these values.
|Additional Information:||©1996 American Institute of Physics. (Received 5 September 1995; accepted 10 October 1995) We would like to thank Justin Greenhalgh of Rutherford Appleton Laboratory for discussions and exchanges of stack development results which helped lead us to this design. We would also like to thank the rest of the LIGO team, especially Rainer Weiss and Stanley Whitcomb, for help in carrying out this work. This research was supported by the NSF Grants No. PHY-8803557 and No. PHY-9210038.|
|Subject Keywords:||ELASTOMERS; INTERFEROMETRY; MECHANICAL VIBRATIONS; SEISMIC NOISE; STAINLESS STEELS; GRAVITATIONAL WAVE DETECTORS; LASER BEAMS; VISCOELASTICITY|
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|Deposited On:||01 Jun 2006|
|Last Modified:||26 Dec 2012 08:53|
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