Noncontacting microwave coupling to a cryogenic gravitational radiation antenna

Details Noncontacting microwave coupling to a cryogenic gravitational radiation antenna Noncontacting microwave coupling to a cryogenic gravitational radiation antenna

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993rsci...64.1905i&link_type=abstract

Review of Scientific Instruments (ISSN 0034-6748), vol. 64, no. 7, p. 1905-1909.

Physics

13

Cryogenic Equipment, Gravitational Wave Antennas, Microstrip Antennas, Microwave Coupling, Vibration Isolators, Cryogenic Temperature, Q Factors, Sensitivity, Transducers, Transmitter Receivers

Scientific paper

Gravitational radiation detectors must detect extremely small displacements, and thus require elaborate vibration isolation systems to attenuate the surrounding environmental noise. Contacting electrical leads can provide a direct path that will short-circuit the vibration isolation, and degrade the antenna Q factor. Noncontacting microstrip transceivers provide a practical means of electromagnetically coupling to a resonant bar gravitational antenna when a microwave transducer is used as a signal readout system. Two microwave patch antennas which now operate as transceivers on the University of Western Australia's 1.5-ton niobium bar gravitational radiation antenna are described in detail. This system allows improved vibration isolation without degradation of the acoustic Q factor of the niobium bar. Combined with a cryogenic amplifier, this system should achieve a reduction of 57 dB in the series noise power. This corresponds to a factor of 700 reduction in the effective displacement noise when referred to the transducer, from 2 x 10 exp -16 to 3 x 10 exp -19 m/sq rt Hz.

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