Proceedings of the 19th International Conference on RF Superconductivity
SRF2019: Proceedings of the 19th International Conference on RF Superconductivity
The magnetic field at which first flux penetrates is a fundamental parameter characterizing superconducting materials for SRF cavities. Therefore, an accurate technique is needed to measure the penetration of the magnetic field directly. The conventional magnetometers are inconvenient for thin superconducting film measurements because these measurements are strongly influenced by orientation, edge and shape effects. In order to measure the onset of field penetration in bulk, thin films and multi-layered superconductors, we have designed, built and calibrated a system combining a small superconducting solenoid capable of generating surface magnetic field higher than 500 mT and Hall probe to detect the first entry of vortices. This setup can be used to study various promising alternative materials to Nb, especially SIS multilayer coatings on Nb that have been recently proposed to delay the vortex penetration in Nb surface. In this paper, the system will be described and calibration will be presented.
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Original Publication Citation
Senevirathne, I. H., Ciovati, G., & Delayen, J. R. (2019). Measurement of the magnetic field penetration into superconducting thin films. In P. Michel, A. Arnold, & V.R.W. Schaa (Eds.), Proceedings of the 19th International Conference on RF Superconductivity (pp. 978-982). JACoW. https://doi.org/10.18429/JACoW-SRF2019-THP050
Senevirathne, Iresha Harshani; Ciovati, Gianluigi; Delayen, Jean R.; Michel, P. (Ed.); Arnold, A. (Ed.); and Schaa, Volker R.W. (Ed.), "Measurement of the Magnetic Field Penetration Into Superconducting Thin Films" (2019). Physics Faculty Publications. 731.