Parametric Transducers for the Advanced Cryogenic Resonant-Mass Gravitational Wave Detectors

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It is shown that a large improvement in liquid helium and ultra-cryogenically cooled resonant-mass gravitational wave detectors can be achieved through improved parametric transducers using either low loss sapphire dielectric resonators or niobium re-entrant cavities. Performance is analysed in relation to the existing resonant bar antenna Niobe and to massive spherical detectors. Applied to Niobe, a millisecond burst sensitivity of order 10(-20) be achieved, corresponding to a spectral strain sensitivity of 2 x 10(-22)/root Hz With a 50 Hz bandwidth. Applied to an ultra-cryogenic 117 tonne spherical detector made from CuAl, a spectral strain sensitivity of better than 10(-23)/root Hz with a bandwidth of order 100 Hz can be achieved, which is close to the quantum limit. This sensitivity is comparable to that of advanced interferometer detectors at this frequency.
Original languageEnglish
Pages (from-to)1799-2001
JournalGeneral Relativity and Gravitation
Issue number9
Publication statusPublished - 2000


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