Back-action-evading transducing scheme for cryogenic gravitational wave antennas

Details Back-action-evading transducing scheme for cryogenic gravitational wave antennas Back-action-evading transducing scheme for cryogenic gravitational wave antennas

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993phrvd..48..448c&link_type=abstract

Physical Review D (Particles, Fields, Gravitation, and Cosmology), Volume 48, Issue 2, 15 July 1993, pp.448-465

Physics

15

Scientific paper

We present the design, development, and test of a resonant capacitive transducer for gravitational wave antennas suitable for back-action-evading measurements. We describe a detailed theoretical model of such a transducer, analyze the general requirements that it must satisfy, and report the results of some tests at low temperatures. We obtain on our prototype a good value of the mechanical merit factor (2.8×106), a satisfactory geometrical balance, and a good stability of the electrical and geometrical parameters. The bridge readout circuit was balanced down to 0.8 ppm and an electrical quality factor Qe~=6×103 was measured for the electrical resonance at 123 kHz. The noise behavior of the system is in satisfactory agreement with the values predicted by our theoretical model.

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