Measurements with a small /M equals 24.4 kg/ cryogenic gravitational-wave antenna at T equals 1.5 K

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Cryogenic Equipment, Gravitational Wave Antennas, Preamplifiers, Bars, Correlation, Data Acquisition, Field Effect Transistors, Noise Temperature

Scientific paper

New measurements obtained by means of a cryogenic gravitational-wave antenna of mass M equals 24.4 kg operated at T equals 4.5 and 1.5 K are reported. The operation was interrupted after 90 hours of data taking, mainly during successive nights, although the antenna could continue to function very satisfactorily for a much longer time. The rate of disturbances is so small that it can be easily eliminated by coincidences with other antennas. The overall effective temperature obtained with an appropriate data analysis algorithm at T equals 1.5 K is about 0.79 K. This value is mostly due to the noise temperature of the FET preamplifier which constitutes the main limiting factor to the sensitivity of present gravitational-wave resonant antennas.

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