Superconductor-sapphire cavity for an all-cryogenic SCSO
Abstract
To develop a superconducting cavity stabilized oscillator (SCSO) as a frequency standard, we are studying the properties of cavities consisting of a single crystal of sapphire surrounded by a superconducting film. Measurements of quality factors of spherical and cylindrical samples of sapphire are reported. Loss values less than 2 × 10^-9 have been measured at a temperature of 1.45K. A design for an all-cryogenic SCSO is described, with particular emphasis on the cavity requirements. We conclude that such a design would allow greatly enhanced stability of operation due substantially to the thermal and physical properties of the sapphire substrate. Cavity Q requirements are relatively modest, with better than 10^-16 frequency stability predicted for a Q of 10^8.
Additional Information
© 1983 IEEE. Manuscript received November 30, 1982. The research described in this paper was carried out by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. D. M. Strayer is a NRC Senior Resident Research Fellow at the Jet Propulsion Laboratory. The support of the National Research Council is gratefully acknowledged.Attached Files
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Additional details
Identifiers
- Eprint ID
- 79516
- Resolver ID
- CaltechAUTHORS:20170727-164846584
Funding
- NASA/JPL/Caltech
- National Research Council
Dates
- Created
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2017-07-28Created from EPrint's datestamp field
- Updated
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2021-11-15Created from EPrint's last_modified field