Document Type

Conference Paper

Publication Date




Publication Title

Proceedings of the 12th International Particle Accelerator Conference



Conference Name

12th International Particle Accelerator Conference, May 24-28, 2021, Campinas, SP, Brazil


Superconducting radiofrequency (SRF) cavities used in particle accelerators operate in the Meissner state. To achieve high accelerating gradients, the cavity material should stay in the Meissner state under high RF magnetic field without penetration of vortices through the cavity wall. The field onset of flux penetration into a superconductor is an important parameter of merit of alternative superconducting materials other than Nb which can enhance the performance of SRF cavities. There is a need for a simple and efficient technique to measure the onset of field penetration into a superconductor directly. We have developed a Hall probe experimental setup for the measurement of the flux penetration field through a superconducting sample placed under a small superconducting solenoid magnet which can generate magnetic fields up to 500 mT. The system has been calibrated and used to measure different bulk and thin film superconducting materials. This system can also be used to study SIS multilayer coatings that have been proposed to enhance the vortex penetration field in Nb cavities.


© 2021 by JACoW

Published under a Creative Commons Attribution 3.0 Unported license (CC BY 3.0).

Original Publication Citation

Senevirathne, I., Delayen, J., Gurevich, A., & Valente-Feliciano, A.-M. (2021) Measurements of magnetic field penetration in superconducting materials for SRF cavities. In L. Liu, J. Byrd, R. Neuenschwander, R. Picoreti, V.R.W. Schaa (Eds.), Proceedings of the 12th International Particle Accelerator Conference (pp. 1208-1211) Joint Accelerator Conferences Website.


0000-0003-0126-8335 (Senevirathne), 0000-0003-0759-8941 (Gurevich)