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 …

Theory of RF superconductivity for resonant cavities

A Gurevich - Superconductor Science and Technology, 2017 - iopscience.iop.org
An overview of a theory of electromagnetic response of superconductors in strong radio-
frequency (RF) electromagnetic fields is given with the emphasis on applications to …

Influence of crystalline structure on rf dissipation in superconducting niobium

CZ Antoine - Physical Review Accelerators and Beams, 2019 - APS
Bulk niobium is the most common material used in the fabrication of rf superconducting
cavities for accelerators. Predicting and reducing the rf surface dissipation in these cavity …

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 …

Surface impedance and optimum surface resistance of a superconductor with an imperfect surface

A Gurevich, T Kubo - Physical Review B, 2017 - APS
We calculate a low-frequency surface impedance of a dirty, s-wave superconductor with an
imperfect surface incorporating either a thin layer with a reduced pairing constant or a thin …

Effect of vortex hotspots on the radio-frequency surface resistance of superconductors

A Gurevich, G Ciovati - Physical Review B—Condensed Matter and Materials …, 2013 - APS
We present detailed experimental and theoretical investigations of hotspots produced by
trapped vortex bundles and their effect on the radio-frequency (rf) surface resistance R s of …

Superconducting radio-frequency fundamentals for particle accelerators

A Gurevich - Reviews of Accelerator Science and Technology, 2012 - World Scientific
An overview of fundamentals of superconductors under radio-frequency electromagnetic
fields in particle accelerators is given, with emphasis on intrinsic physics and materials …

Electron tunneling and X-ray photoelectron spectroscopy studies of the superconducting properties of nitrogen-doped niobium resonator cavities

EM Lechner, BD Oli, J Makita, G Ciovati, A Gurevich… - Physical Review …, 2020 - APS
We use scanning tunneling microscopy (STM) and spectroscopy (STS), and x-ray
photoelectron spectroscopy (XPS) to investigate the effect of nitrogen doping on the surface …

Characterization of dissipative regions of a N-doped superconducting radio-frequency cavity

EM Lechner, BD Oli, J Makita, G Ciovati… - Frontiers in Electronic …, 2023 - frontiersin.org
We report radio-frequency measurements of quality factors and temperature mapping of a
nitrogen doped Nb superconducting RF cavity. Cavity cutouts of hot and cold spots were …

Effect of random pinning on nonlinear dynamics and dissipation of a vortex driven by a strong microwave current

W Pathirana, A Gurevich - Physical Review B, 2021 - APS
We report numerical simulations of a trapped elastic vortex driven by a strong ac magnetic
field H (t)= H sin ω t parallel to the surface of a superconducting film. The surface resistance …