Influence of grooves and defects on the sapphire test mass Q-factor

Details Influence of grooves and defects on the sapphire test mass Q-factor Influence of grooves and defects on the sapphire test mass Q-factor

Mar 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004cqgra..21s1121g&link_type=abstract

Classical and Quantum Gravity, Volume 21, Issue 5, pp. S1121-S1126 (2004).

Physics

Scientific paper

Laser interferometer GW detectors require the test mass to have very high Q-factor normal modes to minimize thermal noise. There have been proposed two types of test mass suspension for advanced interferometers: silica or sapphire wires and membrane flexure suspensions. However, the grooves in the test mass which are required for flexure suspensions could degrade the resonance Q-factor of the test mass. We present Q-factor measurements of a suspended 4.5 kg sapphire test mass. Issues associated with the fabrication and implementation of such suspensions are discussed. Results provide strong evidence that grooves cut in sapphire have a negligible effect on the test mass Q-factor. However, suspension losses associated with bad surface contact of the flexure element do introduce significant losses.

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