Tuning microwave losses in superconducting resonators

A Gurevich - Superconductor Science and Technology, 2023 - iopscience.iop.org
The performance of superconducting resonators, particularly cavities for particle
accelerators and micro cavities and thin film resonators for quantum computations and …

Nb3Sn superconducting radiofrequency cavities: fabrication, results, properties, and prospects

S Posen, DL Hall - Superconductor Science and Technology, 2017 - iopscience.iop.org
A microns-thick film of Nb 3 Sn on the inner surface of a superconducting radiofrequency
(SRF) cavity has been demonstrated to substantially improve cryogenic efficiency compared …

Challenges and opportunities of srf theory for next generation particle accelerators

A Gurevich, T Kubo, JA Sauls - arXiv preprint arXiv:2203.08315, 2022 - arxiv.org
We suggest a program to establish theoretical performance limits of srf cavities using
modern theories of nonequilibrium superconductivity under a strong electromagnetic field …

Field-dependent nonlinear surface resistance and its optimization by surface nanostructuring in superconductors

T Kubo, A Gurevich - Physical Review B, 2019 - APS
We propose a theory of nonlinear surface resistance of a dirty superconductor in a strong
radio-frequency (rf) field, taking into account magnetic and nonmagnetic impurities, finite …

Niobium in the clean limit: An intrinsic type-I superconductor

R Prozorov, M Zarea, JA Sauls - Physical Review B, 2022 - APS
Niobium is one of the most researched superconductors, both theoretically and
experimentally. It is enormously significant in all branches of superconducting applications …

Grain-boundary structure and segregation in Nb3Sn coatings on Nb for high-performance superconducting radiofrequency cavity applications

J Lee, Z Mao, K He, T Spina, SI Baik, DL Hall, M Liepe… - Acta Materialia, 2020 - Elsevier
We report on atomic-scale analyses of grain boundary (GB) structures and segregation in
Nb 3 Sn coatings on Nb, prepared by the vapor-diffusion process, for superconducting …

Superfluid flow in disordered superconductors with Dynes pair-breaking scattering: Depairing current, kinetic inductance, and superheating field

T Kubo - Physical Review Research, 2020 - APS
We investigate the effects of Dynes pair-breaking scattering rate Γ on the superfluid flow in a
narrow thin-film superconductor and a semi-infinite superconductor by self-consistently …

Atomic-scale analyses of Nb3Sn on Nb prepared by vapor diffusion for superconducting radiofrequency cavity applications: a correlative study

J Lee, S Posen, Z Mao, Y Trenikhina… - Superconductor …, 2018 - iopscience.iop.org
We report on atomic-scale analyses of the microstructure of an Nb 3 Sn coating on Nb,
prepared by a vapor diffusion process for superconducting radiofrequency (SRF) cavity …

Effects of nonmagnetic impurities and subgap states on the kinetic inductance, complex conductivity, quality factor, and depairing current density

T Kubo - Physical Review Applied, 2022 - APS
We investigate how a combination of a nonmagnetic impurity scattering rate γ and finite
subgap states parametrized by Dynes Γ affects various physical quantities relevant to …

Effect of inhomogeneous surface disorder on the superheating field of superconducting RF cavities

V Ngampruetikorn, JA Sauls - Physical Review Research, 2019 - APS
Recent advances in the surface treatments of niobium superconducting radio-frequency
(SRF) cavities have led to substantially increased Q factors and a maximum surface field …