Experimental results on a 9.2GHz superconducting cavity stabilized oscillator
Abstract
The experimental results of the frequency stabilization of a Gunn diode oscillator by a 9.2GHz TM(010) niobium superconducting cavity (unloaded Q = 4 x 10 to the 8th) are described. The frequency shift of the superconducting cavity stabilized oscillator (SCSO) induced by the mismatch of a squarelaw detector in the discriminator is studied, and, by improving this problem, the fractional frequency fluctuation due to roomtemperature changes is reduced to less than 1 x 10 to the 13th/C. The frequency stability of the SCSO is measured by comparing it with the autotuned hydrogen maser. The frequency stability of sigma y(tau) reached 1.4 x 10 to the 14th at tau = 500 s, after subtraction of the linear frequency drift. The measured S/N of the discriminator shows that even with the comparatively low Q cavity, shortterm frequency stability of 1.4 x 10 to the 14th/sq rt tau is achieved in the SCSO. The measured acceleration sensitivity of the SCSO was 6.5 x 10 to the 8th/g for the vibration frequency less than 80 Hz.
 Publication:

IEEE Transactions on Instrumentation Measurement
 Pub Date:
 March 1987
 DOI:
 10.1109/TIM.1987.6312620
 Bibcode:
 1987ITIM...36....2K
 Keywords:

 Cavity Resonators;
 Frequency Stability;
 Gunn Diodes;
 Microwave Oscillators;
 Resonant Frequencies;
 Superconductivity;
 Frequency Shift;
 Noise Spectra;
 Phase Modulation;
 Power Spectra;
 Standing Wave Ratios;
 Electronics and Electrical Engineering