Ultra-low phase noise superconducting-cavity stabilised microwave oscillator with application to gravitational radiation detection

Physics – Condensed Matter – Superconductivity

Scientific paper

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Gravitational Waves, Microwave Oscillators, Parametric Frequency Converters, Radiation Detectors, Superconductivity, Frequency Response, Klystrons, Niobium, Resonant Frequencies, Superhigh Frequencies, Transducers

Scientific paper

A superconducting-cavity stabilized oscillator has been constructed which combines active and passive stabilization of a 9.6 GHz klystron to obtain a phase noise power spectral density between -170 dB Hz and -180 dB Hz at 5 kHz from the carrier, which represents about 40 dB improvement over the state-of-the-art. The device has been developed for use as a low noise pump for a superconducting parametric upconverter transducer on a gravitational radiation antenna. An RF modulated reflex klystron is actively locked to a TE(011) niobium cavity operated at 2 K with a loaded Q approximately equal to 10 to the 8th. Power is extracted from the cavity which acts as a high Q filter.

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