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Q of a coaxial cavity with a superconducting inner conductor

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2 Author(s)
Davis, L.E. ; Dept. of Electr. Eng. & Electron., Univ. of Manchester Inst. of Sci. & Technol., UK ; Smith, P.A.

A coaxial TEM resonant cavity, with normally conducting outer tube and end walls and a superconducting inner rod, is analysed. Assuming Rsn varies as omega 12/ and Rss varies as omega 2, the surface-resistance cross-over frequency fc for the two conductors is used as a figure of merit and an expression for the unloaded Q-factor is derived. Graphs are presented that enable the Q-factors of mixed-conductor, all-superconductor and all-normal conductor cavities to be compared easily as a function of resonance frequency over the range 10612 Hz with 108c<1011 Hz as a parameter. The graphs can be used for cavity design either to maximise the Q-factor or to maximise the sensitivity of the Q-factor to variation in crossover frequency.

Published in:

Science, Measurement and Technology, IEE Proceedings A  (Volume:138 ,  Issue: 6 )