Controllable damping of high-Q violin modes in fused silica suspension fibers

Details Controllable damping of high-Q violin modes in fused silica suspension fibers Controllable damping of high-Q violin modes in fused silica suspension fibers

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010cqgra..27b5009d&link_type=abstract

Classical and Quantum Gravity, Volume 27, Issue 2, pp. 025009 (2010).

Computer Science

1

Scientific paper

Fused silica fiber suspension of the test masses will be used in the interferometric gravitational wave detectors of the next generation. This allows a significant reduction of losses in the suspension and thermal noise associated with the suspension. Unfortunately, unwanted violin modes may be accidentally excited in the suspension fibers. The Q-factor of the violin modes also exceeds 108. They have a ring-down time that is too long and may complicate the stable control of the interferometer. Results of the investigation of a violin mode active damping system are described. An original sensor and actuator were especially developed to realize the effective coupling of a thin, optically transparent, non-conducting fused silica fiber with an electric circuit. The damping system allowed the changing of the violin mode's damping rate over a wide range.

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