Field dependent surface resistance of niobium on copper cavities

@inproceedings{Junginger2015FieldDS,
  title={Field dependent surface resistance of niobium on copper cavities},
  author={Tobias Junginger},
  year={2015}
}
The surface resistance RS of superconducting cavities prepared by sputter coating a niobium film on a copper substrate increases significantly stronger with the applied rf field compared to cavities of bulk material. A possible cause is that the thermal boundary resistance between the copper substrate and the niobium film induces heating of the inner cavity wall, resulting in a higher RS. Introducing helium gas in the cavity, and measuring its pressure as a function of applied field allowed to… CONTINUE READING