Document Type
Presentation
Publication Date
2023
DOI
10.2172/2202466
Publication Title
Proceedings of the 21st International Conference on RF Superconductivity
Pages
46 pp.
Conference Name
21st International Conference on RF Superconductivity, 25-30 June 2023, East Lansing, Michigan
Abstract
SRF cavities subjected to heat treatment below 200 °C in the presence of nitrogen showed an improvement in quality factor while maintaining an accelerating gradient above 25 MV/m. Here, we report the rf performance of several single-cell superconducting radio frequency cavities with frequency ranging from 0.75 - 3.0 GHz subjected to low temperature heat treatment in nitrogen environment. The cavities were treated at temperature 120 - 175 oC for 24 - 48 hours in low partial pressure of ultra-pure nitrogen gas. The improvement in Q₀ with Q-rise was observed when nitrogen gas was injected ~300 °C during the furnace treatment. The surface modification was confirmed by the change in electronic mean free path and near surface elemental analysis by SIMS. The field dependence of the rf losses is strongly correlated to the cavity frequency. The analysis of experimental data with available theoretical models as well as comparison with similar study on high temperature nitrogen doped cavities will be presented.
Rights
Copyright © 2023 by JACoW.
Published under a Creative Commons Attribution 4.0 International (CC BY 4.0) License.
Original Publication Citation
Dhakal, P., Ciovati, G., Gurevich, A. V., & Khanal, B. D. (2023). Understanding the field and frequency dependence of RF loss in SRF cavities. 21st International Conference on RF Superconductivity, East Lansing, Michigan. https://doi.org/10.2172/2202466
ORCID
0000-0003-0759-8941 (Gurevich)
Repository Citation
Dhakal, Pashupati; Ciovati, G.; Gurevich, Alex V.; and Khanal, Bashu D., "Understanding The Field and Frequency Dependence of RF Loss in SRF Cavities" (2023). Physics Faculty Publications. 843.
https://digitalcommons.odu.edu/physics_fac_pubs/843