Phys. Rev. Lett. 94, 241101 (2005) [4 pages]3-Mode Detection for Widening the Bandwidth of Resonant Gravitational Wave DetectorsReceived 13 January 2005; published 24 June 2005 We have implemented a novel scheme of signal readout for resonant gravitational wave detectors. For the first time, a capacitive resonant transducer has been matched to the signal amplifier by means of a tuned high Q electrical resonator. The resulting 3-mode detection scheme widens significantly the bandwidth of the detector. We present here the results achieved by this signal readout equipped with a two-stage SQUID amplifier. Once installed on the AURIGA detector, the one-sided spectral sensitivity obtained with the detector operated at 4.5 K is better than 10-20 Hz-1/2 over 110 Hz, and in good agreement with the expectations. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.94.241101
DOI:
10.1103/PhysRevLett.94.241101
PACS:
04.80.Nn, 05.40.−a, 85.25.Dq
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