Design of a Cryocooled Sapphire Oscillator for the Cassini Ka-Band Experiment
نویسندگان
چکیده
We present design aspects of a cryogenic sapphire oscillator that is being developed for ultra-high short-term stability and low phase noise in support of the Cassini Ka-band (32-GHz) radio science experiment. With cooling provided by a commercial cryocooler instead of liquid helium, this standard is designed to operate continuously for periods of a year or more. Performance targets are a stability of 3 × 10−15 (1 second ≤ τ ≤ 100 seconds) and a phase noise of −73 dBc/Hz at 1 Hz measured at 34 GHz. Test results are reported for several subsystems, including the cryocooler, vibration isolation system, and ruby compensating element.
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