A5022519118- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Metal and Thin Film Mechanics
- Gyrotron and Vacuum Electronics Research
- Particle Accelerators and Free-Electron Lasers
- Physics of Superconductivity and Magnetism
- Magnetic confinement fusion research
- Plasma Diagnostics and Applications
- Superconductivity in MgB2 and Alloys
- Radio Frequency Integrated Circuit Design
- Silicon Carbide Semiconductor Technologies
- Fusion materials and technologies
- Spacecraft and Cryogenic Technologies
- Semiconductor materials and devices
- Adhesion, Friction, and Surface Interactions
- Electrostatic Discharge in Electronics
- Particle Detector Development and Performance
- Energy Harvesting in Wireless Networks
- Quantum Information and Cryptography
- Atomic and Subatomic Physics Research
- International Science and Diplomacy
- Quantum and electron transport phenomena
- Advanced Data Storage Technologies
- Electromagnetic Launch and Propulsion Technology
- Copper Interconnects and Reliability
Fermi National Accelerator Laboratory
1900-2025
European Organization for Nuclear Research
2023
Thomas Jefferson National Accelerator Facility
2012-2021
Plasmionique (Canada)
2021
William & Mary
2018-2019
Virginia Tech
2018-2019
Williams (United States)
2018-2019
North Carolina State University
2019
Old Dominion University
2018
Los Alamos National Laboratory
2009-2010
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...
This is a Snowmass white paper on the utility of existing and future superconducting cavities to probe fundamental physics. Superconducting radio frequency (SRF) cavity technology has seen tremendous progress in past decades, as tool for accelerator science. With advances spear-headed by SQMS center at Fermilab, they are now being brought quantum regime becoming science thanks high degree coherence. The same quality factor can be leveraged search new physics, including searches particles,...
Based on the encouraging results of first 1300 MHz 70 mm aperture single-cell re-entrant cavities, we continue high gradient studies for ILC with new cavities made fine-grain as well large-grain niobium. These have smaller apertures 60 mm, providing a further reduced H <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">pk</sub> /E xmlns:xlink="http://www.w3.org/1999/xlink">acc</sub> or improved ultimate gradient. Four reentrant are made, two out...
Nb3Sn offers significant potential to exceed the performance of niobium for superconducting radio frequency accelerator cavities. The most promising path toward deployment is by tin vapor diffusion coating Nb cavity interiors via a two step nucleation-then-growth sequence. Reported here materials science study nucleation process. We manipulated accessible range process variables and determined effect on composition microstructure using an array characterization tools. Broadly, deposits as...
High Q-factors are of utmost importance to minimize losses superconducting radio-frequency cavities deployed in continuous wave particle accelerators. This study elucidates the surface treatment that can maximize high-beta 650 MHz elliptical niobium cavities. State-of-the-art treatments applied many single-cell cavities, and resistance studies performed understand microwave dissipation at this unexplored frequency. The nitrogen doping is confirmed be necessary medium RF fields. We five-cell...
The potential of Nb3Sn for superconducting radio frequency cavities is widely recognized, and renewed R&D efforts continue to bring new insights about the material's structure properties. We have systematically coated niobium samples with different durations. Several were over (“overcoat”) multiple times elucidate growth kinetics during tin vapor-diffusion process. Analysis consistent model in which diffuses via grain boundaries Nb3Sn-Nb interface, where into bulk takes place. Similar...
Nb3Sn (Tc ~ 18 K and Hsh 400 mT) is a prospective material to replace Nb 9 200 in SRF accelerator cavities for significant cost reduction performance enhancement. Because of its properties, best employed as thin film (coating) inside an already built RF cavity structure. A particular test noted C3C4 was 1.5 GHz single-cell cavity, coated with using Sn vapor diffusion process at Jefferson Lab. Cold measurements the indicated superconducting transition temperature about K. Subsequent...
Despite having advantageous superconducting properties, Nb3Sn radiofrequency (SRF) cavities still have practical challenges compared to Nb SRF due the brittle nature of Nb3Sn. Performance degradation can occur when an cavity experiences mechanical stresses, such as during handling and tuning cavity. In this study, we present a potential treatment for that experienced stress-induced performance involves recoating procedure. The degraded is coated with small amount Sn using single-step...
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...
A strong degradation of the unloaded quality factor with field, called high field $Q$ slope, is commonly observed above ${\mathrm{B}}_{p}\ensuremath{\cong}100\text{ }\text{ }\mathrm{mT}$ in elliptical superconducting niobium cavities at 1.3 and 1.5 GHz. In present experiments several 3 GHz were measured up to }\mathrm{mT}$. The measurements show that a slope phenomenon limits reach this frequency, onset depends weakly on can be removed by typical empirical solution electropolishing followed...
Superconducting radio frequency niobium cavities are the building blocks of modern accelerators for scientific applications. Lower surface resistance, higher fields, and high operating temperatures advance reach future discovery as well potentially enabling cost-effective industrial solutions. We describe design performance an Nb3Sn coating system that converts inner to film. The surface, heated by radiation from retort, is exposed Sn SnCl2 vapor during heat cycle, which results in about 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-up cavity, Nb-Sn films are deposited first on flat samples by multilayer sequential of Sn, later annealed at 950 °C for 3 hours. X-ray diffraction showed multiple peaks phase (substrate). No from any Nb- Sn compound other than were detected. Later three cavities coated with ~1 μm thick Nb3Sn. The cavity reached...