Document Type

Conference Paper

Publication Date

2023

DOI

10.18429/JACoW-SRF2023-MOPMB036

Publication Title

Proceedings of the 21st International Conference on RF Superconductivity

Pages

172-177

Abstract

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.

Rights

© 2023 JACoW.

Content from this work may be used under the terms of the Creative Commons Attribution 4.0 International (CC BY 4.0) License. Any distribution of this work must maintain attribution to the authors, title of the work, publisher, and DOI.

Comments

The DOI to this work, https://doi.org/10.18429/JACoW-SRF2023-MOPMB036, does not currently resolve as of September 2023. This will change as the publisher develops a landing page.

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

ORCID

0000-0003-0759-8941 (Gurevich)

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