Initial operation at liquid-helium temperature of the M = 2270 kg Al 5056 gravitational-wave antenna of the Rome group

Details Initial operation at liquid-helium temperature of the M = 2270 kg Al 5056 gravitational-wave antenna of the Rome group Initial operation at liquid-helium temperature of the M = 2270 kg Al 5056 gravitational-wave antenna of the Rome group

Jun 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984ncimc...7..338a&link_type=abstract

Nuovo Cimento C, Serie 1 (ISSN 0390-5551), vol. 7C, May-June 1984, p. 338-354. Research supported by the Japan Society for the P

Physics

11

Cryogenic Cooling, Gravitational Wave Antennas, Liquid Helium, Multimode Resonators, Relativity, Cryostats, Noise Spectra, Q Factors, Squid (Detectors), Transducers, Transistor Amplifiers

Scientific paper

The paper reports on the cooling at liquid-helium temperature of the 2270 kg 5056 Al bar at CERN. The antenna is equipped with a resonant capacitive transducer operating at constant electric charge with an FET low-noise amplifier. The transducer is tuned to the antenna within less than 1 Hz, and the two normal-mode frequencies are nu(-) = 908.160 Hz and n(+) = 924.234 Hz with an applied electric field in the transducer of 10 to the 6th V/m. The corresponding overall merit factors are Q(-) = 5.20 x 10 to the 6th and Q(+) = 7.25 x 10 to the 6th. For several weeks of antenna operation, Brownian noise values in agreement with calculated values have been obtained. Also reported are results of tests performed on a dc SQUID, the input of which was connected to a commercial capacitor via a transformer with a turn ratio of 1000.

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