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Suspensions thermal noise in the LIGO gravitational wave detector

Gabriela González

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We present a calculation of the maximum sensitivity achievable by the LIGO gravitational wave detector in construction, due to limiting thermal noise of its suspensions. We present a method to calculate thermal noise that allows the prediction of the suspension thermal noise in all of its six degrees of freedom, from the energy dissipation due to the elasticity of the suspension wires. We show how this approach encompasses and explains previous ways to approximate the thermal noise limit in gravitational wave detectors. We show how this approach can be extended to more complicated suspensions to be used in future LIGO detectors.


PACS

05.40.Ca Noise

95.55.Ym Gravitational radiation detectors; mass spectrometers; and other instrumentation and techniques

04.80.Nn Gravitational wave detectors and experiments

MSC

83C35 Gravitational waves

Subjects

Instrumentation and measurement

Gravitation and cosmology

Statistical physics and nonlinear systems

Astrophysics and astroparticles

Dates

Issue 21 (7 November 2000)

Received 11 July 2000



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