Characterization of a self-damped pendulum for vibration isolation

In many sensitive measurement systems such as gravitational wave detectors, multistage low-loss vacuum-compatible suspension chains are required to effectively isolate the test mass from seismic disturbances. These chains usually have high quality factor normal modes which require damping. A techniq...

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Bibliographic Details
Published in:Review of scientific instruments 2019-06, Vol.90 (6), p.065103-065103
Main Authors: Vallat, Aodren, Naveh, Yoav, Winterflood, John, Ju, Li, Blair, David G.
Format: Article
Language:English
Subjects:
Chains
Computer simulation
Damping
Gravitational waves
Mathematical models
Order parameters
Pendulums
Q factors
Scientific apparatus & instruments
Vibration measurement
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Summary:In many sensitive measurement systems such as gravitational wave detectors, multistage low-loss vacuum-compatible suspension chains are required to effectively isolate the test mass from seismic disturbances. These chains usually have high quality factor normal modes which require damping. A technique termed “self-damping” in which the motion of orthogonal modes of the same stage mass is deliberately viscously cross-coupled to each other—thereby damping both modes—was engineered into the suspension chains used in an 80 m suspended high-power optical cavity. In this report, we investigate in detail the performance of a single stage of these chains. We model the system using numerical simulation and compare this with experimental measurements with different damping parameters in order to optimize the self-damping obtained using this technique.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.5086764