Superconducting cavity transducer for resonant gravitational radiation antennas

Parametric transducers, such as superconducting rf cavities, can boost the bandwidth and sensitivity of the next generation resonant antennas, thanks to a readily available technology. We have developed a fully coupled dynamic model of the system ''antenna- transducer'' and worked out some estimates of signal-to-noise ratio and the stability conditions in various experimental configurations. We also show the design and the prototype of a rf cavity which, together with a suitable read-out electronic, will be used as a test bench for the parametric transducer.