Abstract
We report on the development of a superconducting cavity stabilized oscillator (SCSO) for use as a high-stability frequency source and for precision measurements. The SCSO system in its optimized condition has a potential frequency stability of parts in 10 17 to 10 18 over short measurement times (up to 10 3 s). It can also operate in two resonant modes, which provides useful diagnostics of sources of frequency instability. This paper describes the progress of applying our SCSO to precise measurements of the equation of state of 4 He gas near T λ and the concepts of using SCSO in conjunction with other ground and space clocks to perform tests of gravitational and relativistic physics.
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