Speaker
Description
Nowadays superconducting radio frequency (SRF) cavities represent fundamental tools used for (Standard Model) particle acceleration, (beyond Standard Model) particle probing, and long-lifetime photon preservation. We study their Quality factor properties mainly at low temperatures within the Dynes superconductor model [1]. We scrutinize and use the local limit response to the external electromagnetic field. Assuming the same regime at low temperatures, we address details of the high-quality plateaus.
Next, studying the sign of the slope of the resonant frequency shift at critical temperature in the moderately clean regime reveals the role of the pair-breaking and pair-conserving disorder. Next, we compare and also fit our results with the recent experimental data from the N-doped Nb sample presented in Ref. [2]. Our analysis remarkably complies with the experimental findings, especially concerning the dip width. We offer straightforward, homogeneous-disorder-based interpretation within the moderately clean regime.
This work presents (and studies the limits of) the simple effective description of the complex problem corresponding to the electromagnetic response in the superconductors combining homogeneous conventional pairing and two different kinds of disorder scattering.
Acknowledgements
This work has been supported by the Slovak Research and Development Agency under the Contract no. APVV-23-0515, by the European Union’s Horizon 2020 research and innovation program under the Marie Skłodowska-Curie Grant Agreement No. 945478.
References
[1] A. Lebedeva et al., “Local Limit Disorder Characteristics of Superconducting Radio Frequency Cavities,” 2024, arXiv. https://doi.org/10.48550/ARXIV.2409.04203
[2] M. Zarea et al., “Electromagnetic Response of Disordered Superconducting Cavities,” arXiv, 2023, https://doi.org/10.48550/ARXIV.2307.07905
