Design and Progress Report for Compact Cryocooled Sapphire Oscillator "VCSO"

G. John Dick, Rabi T. Wang, Robert L. Tjoelker, Ronni Basu

Abstract:	We report on the development of a compact cryocooled sapphire oscillator “VCSO”, designed for operational frequency and timing systems or metrology applications requiring a higher–performance replacement for ultra–stable quartz oscillators. The VCSO matches a new Stirling cryocooler requiring only 160 Watts input power with an improved version of the thermo-mechanically compensated silver/sapphire resonator previously developed for the 40K CSO. We describe details of the sapphire resonator electrical and mechanical design, report on analysis of a crossover circuit that, together with an inexpensive 100 MHz quartz clean–up oscillator, reduces bright–line vibration–induced phase noise spikes by 40 dB or more, and report on cryogenic and vibration tests on a candidate cryocooler.
Published in:	Proceedings of the 37th Annual Precise Time and Time Interval Systems and Applications Meeting August 29 - 31, 2005 Vancouver, Canada
Pages:	363 - 367
Cite this article:	Dick, G. John, Wang, Rabi T., Tjoelker, Robert L., Basu, Ronni, "Design and Progress Report for Compact Cryocooled Sapphire Oscillator "VCSO"," Proceedings of the 37th Annual Precise Time and Time Interval Systems and Applications Meeting, Vancouver, Canada, August 2005, pp. 363-367.
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