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Experimental Evidence for Electric Surface Resistance in Niobium

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Article number8012531
<mark>Journal publication date</mark>1/10/2017
<mark>Journal</mark>IEEE Transactions on Applied Superconductivity
Issue number7
Number of pages7
Publication StatusPublished
Early online date17/08/17
<mark>Original language</mark>English


Identifying the loss mechanisms of niobium cavities enables an accurate determination of applications for future accelerator projects and points to research topics required to mitigate current limitations. For several cavities an increasing surface resistance above a threshold field, saturating at higher field has been observed. Measurements on samples give evidence that this effect is caused by the surface electric field. The measured temperature and frequency dependence is consistent with a model that accounts for these losses by interface tunnel exchange between localized states in dielectric oxides and the adjacent superconductor.