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Cryogenic microwave oscillators built upon sapphire loaded cavity resonators exhibit excellent levels of frequency stability. Here we present an overview of the current understanding of the various processes and noise sources that limit this frequency stability performance and provide an outlook of future research.
A new formulation for computing the unloaded quality factor (Q) of a resonator or of any terminated electromagnetic or piezoelectric cavity from its measured S parameters is proposed. This formulation, based on the work of Dicke, and Bode, computes Q at a continuum of frequencies from below the resonant frequency (fs) to above the anti-resonant frequency (fp). Sixty years ago Dicke and Beringer derived...
High power microwave devices are of interest for applications to pulse compression in cavities, as electromagnetic pumps for free-electron lasers, air breakdown studies, advanced high energy accelerators and plasma heating for magnetic-confinement fusion. Two experimental approaches have been pursued to obtain high-power microwave radiation from high voltage magnetrons. In one approach at MIT and...
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