Abstract
Hybrid cavities, cavities with a layer of superconductor applied on top of the OFHC copper, are studied. The quality factor of a single thin layer and of a multilayer superconductor/insulator stack are estimated. The results for these thin-film coatings are not good. However, if the superconductor (either multilayer or single layer) were separated from the copper by a thick dielectric spacer, one that is a fraction of the wavelength at the cavity resonant frequency, extremely high quality factors could be obtained.
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Notes
- 1.
The thin-film program ThinFilmFit or TFF is available at http://www.phys.ufl.edu/~tanner/datan.html as part of the zip file datan.zip. A manual can be found at the same link. Users may probably also want to employ CoMPute (CMP) and Dielectric Function Calculator (DFC) in addition.
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Acknowledgements
This research was supported by DOE grant DE-SC0010296.
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Stern, I., Tanner, D.B. (2018). Hybrid Cavities for Axion Detectors. In: Carosi, G., Rybka, G., van Bibber, K. (eds) Microwave Cavities and Detectors for Axion Research. Springer Proceedings in Physics, vol 211. Springer, Cham. https://doi.org/10.1007/978-3-319-92726-8_9
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