Proceedings of the 21st International Conference on RF Superconductivity
A new magnetic field mapping system for 1.3 GHz single-cell cavities was developed in order to reveal the impact of ambient magnetic field and temperature gradients during cool-down on the flux trapping phenomenon. Measurements were done at 2 K for different cool-down conditions of a large-grain cavity before and after 120 °C bake. The fraction of applied magnetic field trapped in the cavity walls was ~ 50% after slow cool-down and ~ 20% after fast cool-down. The results showed a weak correlation between between trapped flux locations and hot-spots causing the high-field Q-slope. The results also showed an increase of the trapped flux at the quench location, after quenching, and a local redistribution of trapped flux with increasing RF field.
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Original Publication Citation
Parajuli, I. P., Delayen, J. R., & Gurevich, A. V. (2023). Magnetic field mapping of a large-grain 1.3 GHz single-cell cavity. In K. Saito, T. Xu, N. Sakamoto, V.R.W. Schaa, P. Thomas (Eds.), Proceedings of the 21st International Conference on RF Superconductivity (172-177). JACoW. https://srf2023.vrws.de/papers/mopmb036
Parajuli, Ishwari Prasad; Delayen, Jean R.; Gurevich, Alex V.; and Ciovati, Gianluigi, "Magnetic Field Mapping of a Large-Grain 1.3 GHz Single-Cell Cavity" (2023). Physics Faculty Publications. 806.