Document Type

Conference Paper

Publication Date

2024

DOI

10.18429/JACoW-IPAC2024-WEPS34

Publication Title

Proceedings of the 15th International Particle Accelerator Conference

Pages

2768-2771

Conference Name

15th International Particle Accelerator Conference, 19-24 May 2024, Nashville, TN

Abstract

One of the significant sources of residual losses in superconducting radio-frequency cavities is magnetic flux trapped during the cool-down due to the incomplete Messier effect. If the trapped vortices are non-uniformly distributed on the cavity surface, the temperature mapping revealed the “hot-spots” at the location of high density of pinned vortices. Here, we performed a rf test on 1.3 GHz single cell cavity with the combination of the temperature mapping system. The temperature mapping reveled the development of the hot spots with the increase in rf field inside the cavity. When magnetic field is trapped locally on the surface of cavity, the hot-spots strength increase rapidly, showing the direct correlation of vortex induced hot spot and corresponding rf loss.

Rights

© The Authors 2024.

Published under the terms of the Creative Commons Attribution 4.0 International (CC BY 4.0) License.

Original Publication Citation

Khanal, B., & Dhakal, P. (2024). Investigation of hot-spots due to trapped flux in niobium superconducting radiofrequency cavities. In F. Pilat, W. Fischer, R. Saethre, P. Anisimov, & I. Andrian (Eds.), Proceedings of the 15th International Particle Accelerator Conference (pp. 2768-2771). JACoW Publishing. https://doi.org/10.18429/JACoW-IPAC2024-WEPS34

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