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We present the characterisation of the most recent parametric transducers designed to enhance the Mario Schenberg gravitational wave detector sensitivity. The transducer is composed of a microwave re-entrant cavity that attaches to the gravitational wave antenna via a rigid spring. It functions as a three-mode mass-spring system; motion of the spherical antenna couples to a 50 μm thick membrane, which converts its mechanical motion into a frequency shift of the cavity resonance. Through the optical spring effect, the microwave transducer frequency-displacement sensitivity was measured to be 726 MHz μm-1 at 4 K. The spherical antenna detection sensitivity is determined analytically using the transducer amplification gain and equivalent displacement noise in the test setup, which are 5.5 × 1011 V m-1 and 1.8 × 1019 m √Hz-1, respectively.
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Milburn, G., White, A., Doherty, A., Tobar, M., Twamley, J., Bartlett, S., Biercuk, M., Bowen, W., Brennan, G., Duty, T., Gilchrist, A., Molina-Terriza, G., Rabeau, J., Reilly, D., Rubinsztein-Dunlop, H., Stace, T. & Vidal, G.
1/01/11 → 31/12/17