Document Type


Publication Date




Publication Title

Proceedings of the 21st International Conference on RF Superconductivity


46 pp.

Conference Name

21st International Conference on RF Superconductivity, 25-30 June 2023, East Lansing, Michigan


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.


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.


0000-0003-0759-8941 (Gurevich)