Simulation study of LC superconducting microresonators for diamond characterization

The development of high optical quality, ultra-low losses single crystal
diamond windows is paramount for the realization of future nuclear
fusion facilities like DEMO, given the foresaw increase in power
of microwave ECRH systems. Precise determination of the dielectric
characteristics (𝜖r and tan𝛿) of these innovative materials have
so far relied on techniques involving Fabry-Perot microwave open resonators
in various configurations. High Q, superconducting thin film
resonators can be effectively used to determine dielectric characteristics
of extremely low losses materials like single- and poly-crystalline
diamond. Their extremely high-quality factors allow for a substantial
increase in resolution in the determination of these parameters when
compared to state-of-the-art Fabry Perot open resonators. We hereby
report a detailed simulation study of the chosen resonators configurations
(Lumped Elements and Circular) that lead to the final design of
the devices.