Kramer, F.; Keckert, S.; Kugeler, O.; Knobloch, J.; Kubo, T.: Study of the Dynamics of Flux Trapping in Different SRF Materials. In: Kenji Saito ... [Ed.] : SRF2023 : Proceedings of the 21st International Conference on RF Superconductivity, Grand Rapids, MichiganGeneve: JACoW, 2023. - ISBN 978-3-95450-234-9, p. TUCXA01/380-387
https://srf2023.vrws.de/papers/tucxa01.pdf
Open Access Version
Abstract:
A dedicated experimental setup to measure magnetic fux dynamics and trapped fux in samples is used to precisely map out how trapped fux is infuenced by dierent parameters. The setup allows or rapid thermal cycling o the sample so that eects o cooldown parameters can be investigated in detail. We show how temperature gradient, cooldown rate, and the magnitude o external eld infuence trapped fux in large-grain, ne-grain and coated niobium samples. The detailed measurements show unexpected results, namely that too ast cooldowns increase trapped fux, large-grain material traps fux only when the external eld is larger than a temperature gradient dependent threshold eld, and the measured dependence o trapped fux on temperature gradient does not agree with an existing model. Thereore, a new model is presented which agrees better with the measured results.