19 citations · 110 across the 26 of their papers we have counts for
28 papers
Failure of Conventional Roughness Metrics in Assessing Field-Limiting Mesoscopic Topography in SRF Nb Films on Cu
Eric M. Lechner, Brandi Redman, Theodore S. Cahall +1
A characteristic corrugated surface morphology of Nb films on Cu is identified, with mesoscopic features comparable to the London penetration depth and coherence length, and its im…
Design optimization, commissioning, and uncertainty analysis of the quadrupole resonator system at Jefferson Lab for SRF material characterization
Mingqi Ge, Sarra Bira, Kristof Brunner +14
A quadrupole resonator (QPR) provides a sample-based platform for characterizing materials for superconducting radio-frequency (SRF) applications under controlled field, frequency,…
RF-Budgeted Frame Compilation for Frequency-Multiplexed Superconducting-Qubit Control Using Qubit-Control Identity Records and a Circuit-Informed RFSoC Model
Mingqi Ge, Anne-Marie Valente-Feliciano
Frequency-multiplexed superconducting-qubit control requires more than carrier assignment: the RF budget of a shared source can perturb multi-qubit rotations through finite bandwid…
Investigation of coherence of niobium-based resonators enabled by a fast-sealing microwave cavity
Chi Zhang, Richard Germond, Noah Janzen +3
Resonators and qubits with a niobium (Nb) base metal layer achieve some of the highest coherence times in superconducting quantum devices. The performance of such devices is often…
Microscopic parameters of a type-II superconductor measured by small-angle neutron scattering
D. Alba Venero, A. -M. Valente-Feliciano, O. O. Bernal +1
A necessary condition for understanding and predicting the properties of any material is knowledge of microscopic parameters which control these properties in a state of thermodyna…
Impact of metallographic polishing on the RF properties of Niobium for SRF applications
Oleksandr Hryhorenko, Anne-Marie Valente-Feliciano, David Longuevergne +6
The performance of superconducting radio-frequency (SRF) cavities made of Niobium is tied to the quality of their inner surfaces exposed to the radio frequency (RF) waves. Future s…
Electropolishing-Induced Topographic Defects in Niobium: Insights and Implications for Superconducting Radio Frequency Applications
Oleksandr Hryhorenko, Anne-Marie Valente-Feliciano, Eric M. Lechner
Electropolishing is the premier surface preparation method for high-Q, high-gradient superconducting RF cavities made of Nb. This leaves behind an apparently smooth surface, yet th…
Nb3Sn coating of SRF cavity by co-sputtering from a composite target
Md Sharifuzzaman Shakel, Grigory V. Eremeev, Anne-Marie Valente-Feliciano +2
We deposited Nb3Sn film on the inner surface of a 2.6 GHz Nb superconducting radiofrequency (SRF) cavity by co-sputtering using a composite of Nb and Sn tube targets in a DC cylind…
Optically accessible high-finesse millimeter-wave resonator for cavity quantum electrodynamics with atom arrays
Tony Zhang, Michelle Wu, Sam R. Cohen +9
Cavity quantum electrodynamics (QED) is a powerful tool in quantum science, enabling preparation of non-classical states of light and scalable entanglement of many atoms coupled to…
Flux trapping in NbTiN strips
Ruiheng Bai, Aliakbar Sepehri, Anne-Marie Valente-Feliciano +4
We use scanning superconducting quantum interference device (SQUID) microscopy to image individual vortices in superconducting strips fabricated from NbTiN thin films. By repeatedl…
Properties of Nb\_xTi\_{(1-x)}N thin films deposited on 300 mm silicon wafers for upscaling superconducting digital circuits
Daniel Pérez Lozano, Jean-Philippe Soulié, Blake Hodges +7
Scaling superconducting digital circuits requires fundamental changes in the current material set and fabrication process. The transition to 300 mm wafers and the implementation of…
First Results from Nb3Sn Coatings of 2.6 GHz Nb SRF Cavities Using DC Cylindrical Magnetron Sputtering System
M. S. Shakel, H. E. Elsayed-Ali, G. Eremeev +2
A DC cylindrical magnetron sputtering system has been commissioned and operated to deposit Nb3Sn onto 2.6 GHz Nb SRF cavities. After optimizing the deposition conditions in a mock-…
Scaling NbTiN-based ac-powered Josephson digital to 400M devices/cm
Anna Herr, Quentin Herr, Steve Brebels +9
We describe a fabrication stackup for digital logic with 16 superconducting NbTiN layers, self-shunted a-silicon barrier Josephson Junctions (JJs), and low loss, high- tunable H…
Evidence for current suppression in superconductor-superconductor bilayers
Md Asaduzzaman, Ryan M. L. McFadden, Anne-Marie Valente-Feliciano +5
Superconducting radio frequency (SRF) cavities, which are critical components in many particle accelerators, need to be operated in the Meissner state to avoid strong dissipation f…
RF Accelerator Technology R&D: Report of AF7-rf Topical Group to Snowmass 2021
Sergey Belomestnykh, Emilio A. Nanni, Hans Weise +18
Accelerator radio frequency (RF) technology has been and remains critical for modern high energy physics (HEP) experiments based on particle accelerators. Tremendous progress in ad…
Next-Generation Superconducting RF Technology based on Advanced Thin Film Technologies and Innovative Materials for Accelerator Enhanced Performance and Energy Reach
A. - M. Valente-Feliciano, C. Antoine, S. Anlage +25
Superconducting RF is a key technology for future particle accelerators, now relying on advanced surfaces beyond bulk Nb for a leap in performance and efficiency. The SRF thin film…
Key directions for research and development of superconducting radio frequency cavities
S. Belomestnykh, S. Posen, D. Bafia +53
Radio frequency superconductivity is a cornerstone technology for many future HEP particle accelerators and experiments from colliders to proton drivers for neutrino facilities to…
An Impartial Perspective for Superconducting Nb3Sn coated Copper RF Cavities for Future Accelerators
E. Barzi, B. C. Barish, R. A. Rimmer +32
This Snowmass21 Contributed Paper encourages the Particle Physics community in fostering R&D in Superconducting Nb3Sn coated Copper RF Cavities instead of costly bulk Niobium. It d…
Nb3Sn multicell cavity coating system at JLAB
G. Eremeev, W. Clemens, K. Macha +5
SRF niobium cavities are the building blocks of modern accelerators for scientific applications. Lower surface resistance, higher fields, and high operating temperatures advance th…
High Frequency Nonlinear Response of Superconducting Cavity-Grade Nb surfaces
Bakhrom Oripov, Thomas Bieler, Gianluigi Ciovati +9
Nb Superconducting Radio-Frequency (SRF) cavities are observed to break down and lose their high-Q superconducting properties at accelerating gradients below the limits imposed by…
Possible existence of a filamentary state in type-II superconductors
V. Kozhevnikov, A. -M. Valente-Feliciano, P. J. Curran +6
The standard interpretation of the phase diagram of type-II superconductors was developed in 1960s and has since been considered a well-established part of classical superconductiv…
Cryogenic rf test of the first plasma etched SRF cavity
J. Upadhyay, A. Palczewski, S. Popović +4
Plasma etching has a potential to be an alternative processing technology for superconducting radio frequency (SRF) cavities. An apparatus and a method are developed for plasma etc…
Equilibrium properties of the mixed state in superconducting niobium in a transverse magnetic field: Experiment and theoretical model
V. Kozhevnikov, A. -M. Valente-Feliciano, P. J. Curran +5
Equilibrium magnetic properties of the mixed state in type-II superconductors were measured with high purity bulk and film niobium samples in parallel and perpendicular magnetic fi…
Apparatus and method for plasma processing of SRF cavities
J. Upadhyay, Do Im, J. Peshl +5
An apparatus and a method are described for plasma etching of the inner surface of superconducting radio frequency (SRF) cavities. Accelerator SRF cavities are formed into a variab…