We have derived general equations to calculate intermodulation distortion in resonators with high temperature superconducting (HTS) films which are not restricted to a specific resonator shape and may be used whenever the fields in a resonator generate currents on the surface of one or more HTS films. These equations are applied to rutile-loaded cavities with one or two 10 × 10 mm2 Y-Ba2-Cu3-O7– endplates and are used to extract parameters characterizing the nonlinearities of these films from intermodulation measurements. Even though the films have similar small-signal performance, we have found large variation in the strength of their nonlinearities.
CitationMateu, J.; Collado, C.; Menéndez, O.; O'Callaghan, J. Experiments and model of intermodulation distortion in a rutile resonator with YBCO endplates. Journal of superconductivity, 2003, vol. 16, núm. 5, p. 873-880.
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