A5010697644- Superconducting Materials and Applications
- Physics of Superconductivity and Magnetism
- Particle accelerators and beam dynamics
- Quantum and electron transport phenomena
- Superconductivity in MgB2 and Alloys
- Metal and Thin Film Mechanics
- Osteoarthritis Treatment and Mechanisms
- Semiconductor Quantum Structures and Devices
- Advanced Semiconductor Detectors and Materials
- Fusion materials and technologies
- Particle Accelerators and Free-Electron Lasers
- Total Knee Arthroplasty Outcomes
- Magnetic properties of thin films
- Quantum Dots Synthesis And Properties
- Advanced Materials Characterization Techniques
- Knee injuries and reconstruction techniques
- Semiconductor materials and devices
- Quantum Computing Algorithms and Architecture
- Iron-based superconductors research
- Ion-surface interactions and analysis
- Rare-earth and actinide compounds
- Magnetic and transport properties of perovskites and related materials
- Surface and Thin Film Phenomena
- Quantum Information and Cryptography
- Lower Extremity Biomechanics and Pathologies
Fermi National Accelerator Laboratory
2018-2025
Kangnam University
2024
Brigham Young University
2021
Northwestern University
2004-2020
University of Illinois Urbana-Champaign
2014-2017
Seoul National University
2009-2014
Abstract Nb 3 Sn is a promising next-generation material for superconducting radiofrequency cavities, with significant potential both large scale and compact accelerator applications. However, so far, cavities have been limited to continuous wave accelerating fields <18 MV m −1 . In this paper, new results are presented significantly higher fields, as high 24 in single cell cavities. Results also from the first ever Sn-coated 1.3 GHz 9-cell cavity, full-scale demonstration on cavity type...
Superconducting qubits have emerged as a potentially foundational platform technology for addressing complex computational problems deemed intractable with classical computing. Despite recent advances enabling multiqubit designs that exhibit coherence lifetimes on the order of hundreds μs, material quality and interfacial structures continue to curb device performance. Two-level system defects in thin superconducting film adjacent dielectric regions introduce stochastic noise dissipate...
Superconducting thin films of niobium have been extensively employed in transmon qubit architectures. Although these architectures demonstrated improvements recent years, further performance through materials engineering will aid large-scale deployment. Here, we use information retrieved from secondary ion mass spectrometry and electron microscopy to conduct a detailed assessment the surface oxide that forms ambient conditions for test devices patterned film. We observe this exhibits varying...
This contribution discusses the results of an in situ X-ray photoelectron spectroscopy study thermal evolution native oxide layer on Nb3Sn and pure Nb. (XPS) data were recorded with conventional spectrometers using Al Kα source for spectra collected up to 600 °C a Mg temperatures above °C. The effect thickness, composition, stability that is relevant understanding functional properties superconducting radiofrequency (SRF) cavities used particle accelerators. There consensus plays role...
We report an atomic-scale analysis of the microstructure Nb3Sn coating on Nb prepared by vapor diffusion process for superconducting radiofrequency (SRF) cavity application using transmission electron microscopy (TEM). Epitaxial growth substrate is found and four types orientation relationships at Nb3Sn/Nb interface are identified diffraction or high-resolution scanning (STEM) analysis. Thin grains observed in regions with low Sn flux they have specific relationship, (1-20)//Nb (-111)...
This paper presents two types of electrowetting principles - regular (EW) and on dielectric (EWOD), applied for microactuation correspondingly designed test devices addressable micro liquid handling. The demonstrated sequential electrodes with (EWOD) or without hydrophobic coating them.
We study mechanisms of vortex nucleation in Nb$_3$Sn Superconducting RF (SRF) cavities using a combination experimental, theoretical, and computational methods. Scanning transmission electron microscopy (STEM) image energy dispersive spectroscopy (EDS) some show Sn segregation at grain boundaries with concentration as high $\sim$35 at.\% widths $\sim$3 nm chemical composition. Using ab initio calculations, we estimate the effect excess tin has on local superconducting properties material....
Iron-based superconductors (IBSCs) are a class of material under investigation for the development superconducting wires in low-temperature-high magnetic fields power application. Among various families IBSCs, 1144 CaKFe4As4 compound is promising able to achieve outstanding properties with cheap and simple chemical composition. Oxidation, these compounds, considered an obstacle high intergranular critical current density, Jc,GB. A study devoted evaluation oxidation phenomena their effects on...
Multifunctional Nanoparticles: A facile approach to create multi-functional nanopyramids has been demonstrated. The surfaces of bi-material Au/Ni were differentially modified with chemical and biological moieties. Dye-labeled used as probes for dual-mode optical imaging (scattering fluorescence). Under a magnetic field, these NPs also assembled into 1D chains that exhibited polarization- dependent properties.
We report on the analysis of stress-induced structural changes and formation an omega $(\ensuremath{\omega})$ phase in polycrystalline Nb thin films deposited Si by high-power impulse magnetron sputtering (HiPIMS) for superconducting qubits using x-ray diffraction (XRD), transmission electron microscopy (TEM), density-functional theory (DFT). XRD indicates that internal stresses lead to ${112}\ensuremath{\langle}111\ensuremath{\rangle}$ deformation twins TEM shows $\ensuremath{\omega}$...
Niobium has been the material of choice for SRF cavities several decades due to its formability and superconducting properties. The accelerating gradient niobium is, however, rapidly approaching a theoretical limit. To achieve higher gradients new is needed that can sustain high fields. Nb <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> Sn promising competitor with transition temperature critical field than pure niobium. However, very...
Superconducting niobium serves as a key enabling material for superconducting radio frequency (SRF) technology well quantum computing devices. At room temperature, hydrogen commonly occupies tetragonal sites in the Nb lattice metal (M)-gas (H) phase. When temperature is decreased, however, solid solution of Nb-H starts to be precipitated. In this study, we show first identified topographical features associated with nanometer-size hydride phase (Nb1-xHx) precipitates on metallic using...
Niobium films are a key component in modern two-dimensional superconducting qubits, yet their contribution to the total qubit decay rate is not fully understood. The presence of different layers materials and interfaces makes it difficult identify dominant loss channels present designs. In this paper, we study that directly correlates measurements RF losses such material parameters by investigating high-power impulse magnetron sputtered (HiPIMS) film atop three-dimensional niobium radio...
Superconducting niobium serves as a key enabling material for superconducting radio frequency (SRF) technology well quantum computing devices. Niobium has high propensity the uptake of hydrogen. At room temperature, hydrogen commonly occupies tetragonal sites in Nb lattice metal (M)–gas (H) phase. When temperature is decreased, however, solid solution Nb-H begins to precipitate. In this study, we show first identified topographical features associated with nanometer-size hydride phase...