Document Type

Conference Paper

Publication Date




Publication Title

Proceedings of the 20th International Conference on RF Superconductivity



Conference Name

20th International ConferencSuperconductivity, 27 June-02 July, 2021, East Lansing, Michige on RF an


We report extensive numerical simulations on nonlinear dynamics of a trapped elastic vortex under rf field, and its dependence on electron mean free path li. Our calculations of the field-dependent residual surface resistance Ri(H) take into account the vortex line tension, the linear Bardeen-Stephen viscous drag and random distributions of pinning centers. We showed that Ri(H) decreases significantly at small fields as the material gets dirtier while showing field independent behavior at higher fields for clean and dirty limit. At low frequencies Ri(H) increases smoothly with the field amplitude at small H and levels off at higher fields. The mean free path dependency of viscosity and pinning strength can result in a nonmonotonic mean free path dependence of Ri, which decreases with li at higher fields and weak pinning strength.


© 2022 The Authors and JACoW Publishing.

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Original Publication Citation

Pathiranage, M. R. P., & Gurevich, A. V. (2021) Effect of mean free path on nonlinear losses of trapped vortices driven by a RF field. In K. Saito, T. Xu, N. Sakamoto, A. Lesage & V.R.W. Schaa (Eds), Proceedings of the 20th International Conference on RF Superconductivity (pp. 67-71). JACoW.


0000-0003-0759-8941 (Gurevich)