The superconductingcavity stabilized oscillator and an experiment to direct time variation of the fundamental constants
Abstract
A precision microwave oscillator system was developed which has a superconducting cavity as its frequency determining element. The frequency stability of the device, called the superconductingcavity stabilized oscillator (SCSO), was studied using both spectrum analysis and period measurement techniques. For times shorter than onethousand seconds the frequency fluctuations, as measured by the Allan variance, are smaller than for any other high stability frequency source; the noise floor of the fractional frequency fluctuations is 10 to the minus 16th power at the present time. The long term performance of an ensemble of SCSO systems has been measured relative to the frequency of a cesiumbeam frequency standard.
 Publication:

NASA STI/Recon Technical Report N
 Pub Date:
 October 1974
 Bibcode:
 1974STIN...7532350S
 Keywords:

 Microwave Oscillators;
 Superconductors;
 Cavity Resonators;
 Frequency Stability;
 Spectrum Analysis;
 Electronics and Electrical Engineering