ISSN:
1089-7623
Source:
AIP Digital Archive
Topics:
Physics
,
Electrical Engineering, Measurement and Control Technology
Notes:
A series of measurements were undertaken to measure the quality factor of a full scale prototype of the last stage suspension system (a 21 kg pendulum) of the VIRGO gravitational wave interferometer, by using a structure with negligible recoil losses. The suspension wires consisted of two loops of C85 harmonic steel with a diameter of 200 μm that formed a pendulum with a length of 0.70 m. The measured pendulum Q varied from ∼1×104 for the wire simply cradling the mass to 8×105 for the wire being offset from the mass with a prism shaped spacer, while the theoretical value for the pendulum Q was calculated to be 6.7×106. The best measured Q was 1.1×106 for a 20 kg glass mass with metal clamps rigidly attached to it. The main factor that limits the pendulum Q is the dissipation in the wire–test mass attachment. More advanced designs using new materials are needed in order to increase the pendulum Q significantly. © 2000 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.1150607
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