Preliminary results on the operation of a 2270 kg cryogenic gravitational-wave antenna with a resonant capacitive transducer and a d.c. SQUID amplifier

Details Preliminary results on the operation of a 2270 kg cryogenic gravitational-wave antenna with a resonant capacitive transducer and a d.c. SQUID amplifier Preliminary results on the operation of a 2270 kg cryogenic gravitational-wave antenna with a resonant capacitive transducer and a d.c. SQUID amplifier

Aug 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986ncimc...9..829a&link_type=abstract

Nuovo Cimento C, Serie 1 (ISSN 0390-5551), vol. 9C, July-Aug. 1986, p. 829-845. Research supported by the Istituto Nazionale di

Physics

25

Cryogenic Equipment, Gravitational Wave Antennas, Squid (Detectors), Capacitors, Direct Current, Fourier Transformation, Resonators

Scientific paper

In November 1985 the gravitational-wave antenna of the Rome group, installed at CERN, has started operating. It consists of a 5056 aluminum cylinder 3 m long, 2270 kg heavy, cooled at 4.2 K. The antenna vibrations are detected by means of a resonant capacitive transducer that together with the bar makes a two-coupled-oscillator system. The low-noise amplification is obtained with a dc SQUID amplifier. The frequencies of the two resonant modes are: nu- = 907.116 and nu+ = 923.083 Hz, with merit factors Q- = 3.2 x 10 to the 6th and Q+ = 5.6 x 10 to the 6th. The sensitivity to short gravitational bursts, expressed in terms of effective noise temperature, is 18 mK. This corresponds to a change in the metric tensor whose Fourier transform is H = 1.1 x 10 to the 21st per Hz. For monochromatic waves the antenna is sensitive (SNR = 1) to h equal to about 2 x 10 to the -25th in a bandwidth of about 1/3 Hz, with a three months integration time.

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