3-mode detection for widening the bandwidth of resonant gravitational wave detectors

Details 3-mode detection for widening the bandwidth of resonant gravitational wave detectors 3-mode detection for widening the bandwidth of resonant gravitational wave detectors

2005-02-24

arxiv.org/abs/gr-qc/0502101v1

Phys.Rev.Lett. 94 (2005) 241101

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

17 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.94.241101

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.

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