A5000121060- Physics of Superconductivity and Magnetism
- Superconducting Materials and Applications
- Superconductivity in MgB2 and Alloys
- Magnetic and transport properties of perovskites and related materials
- Particle accelerators and beam dynamics
- Advanced Condensed Matter Physics
- HVDC Systems and Fault Protection
- Non-Destructive Testing Techniques
- Cardiac Structural Anomalies and Repair
- Quantum and electron transport phenomena
- Magnetic Field Sensors Techniques
- Magneto-Optical Properties and Applications
- Iron-based superconductors research
Florida State University
2021-2025
National High Magnetic Field Laboratory
2019-2024
Abstract The fusion power density produced in a tokamak is proportional to its magnetic field strength the fourth power. Second-generation high temperature superconductor (2G HTS) wires demonstrate remarkable engineering current (averaged over full wire), J E , at very fields, driving progress and other applications. key challenge for HTS has been offer an acceptable combination of consistent superconducting performance volume supply, low price. Here we report reproducible practical based on...
Multifilamentary Bi <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> Sr CaCu O xmlns:xlink="http://www.w3.org/1999/xlink">x</sub> (Bi-2212) wire made by the powder-in-tube technique is only high-temperature superconductor in round shape preferred magnet builders. The critical current density (J xmlns:xlink="http://www.w3.org/1999/xlink">C</sub> ) of Bi-2212 was improved significantly development overpressure heat treatment past few years....
Next generation particle accelerators and fusion machines will greatly benefit from the development of low-inductance magnets capable generating magnetic fields in excess 16 T. Such require high-temperature superconductors carrying very high currents exceeding 5 kA at current densities 400–600 A mm−2, such as Conductor on Round Core (CORC®) cables wires wound RE-Ba2Ca3O7-δ (ReBCO, Re = rare earth) coated conductor tapes. CORC® containing ReBCO tapes with 30 μm thick Hastelloy® substrates...
Here we report the effect of field-dependent index value <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$n(B,\theta)$</tex-math></inline-formula> on screening current and consequential NI REBCO coil behavior. Through ‘Little Big Coil (LBC)’ framework, an unexpected voltage behavior has been observed at top bottom coils in fourth mini magnet LBC4 during self-field operation 77 K. The measurement demonstrates...
Abstract Recent reports on screening current stress simulations of high-field REBCO magnets frequently present peak stresses over 1 GPa. However, this result is probably an unrealistic artifact purely elastic calculations, considering the macroscopic yield and fracture approximately 900 MPa less than 1.1 GPa for Hastelloy substrate-coated conductors. Here, we evaluate elastic-plastic conductor damage at 0.4% strain using a high-stress coil exposed to high field explore regime. The was...
REBCO (Rare Earth Barium Copper Oxide) coated conductors (CCs) have emerged for future high field magnets in fields and temperatures inaccesible Nb based superconductors. However, their exceptionally current densities pose challenges characterization at low temperatures. This paper presents the design implementation of a simple torque magnetometer especially suitable characterizing CC. It details construction underlying physics, with particular emphasis on its capability to assess angular...
Abstract Conductor on Round Core (CORC ® ) wires and cables, constructed from multiple layers of helically wound REBa 2 Cu 3 O 7− δ tapes, are a promising cable technology for high field magnet applications. An important feature high-temperature superconductor cables is the ability to share current between conductors, allowing bypass drops in I c minimizing risk hot spot formation, which could lead potential burnout superconductor. In contrast stacked-tape have continuous contact CORC...
Abstract RE–Ba–Cu–O (REBCO, RE = rare earth) symmetric tape round (STAR ® ) wires of 1.5–2.5 mm diameter have been fabricated with 4–12 strands REBCO made by advanced metal organic chemical vapor deposition (MOCVD). 1.5 STAR just four MOCVD are able to sustain nearly the same critical current ( I c as 2.5 12 commercial-grade strands. An 1070 A, corresponding an engineering density J e 597 A −2 , has demonstrated at 4.2 K, 30 T in diameter, four-strand wire a bend radius 15 mm. This value...
Abstract This paper reports the magnetic field and winding force-dependent contact resistance, also known as characteristic of no-insulation (NI) REBCO coil. Three NI coils were wound with different forces ( <?CDATA $\lt$?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mo><</mml:mo> </mml:math> 1 kgf, 3 5 kgf) using same REBCO-coated conductor, they tested at 4.2 K in a background 0, 5, 10, 14 T. The resistance each coil is measured field. As result...
Abstract The complex, multilayer structure of REBCO Coated Conductor (CC) poses significant challenges in the fabrication high magnetic field devices where large stresses may initiate various forms damage. Our goal is to peer below cartoon representations CC so that, amongst other things, we might better understand whether a from one manufacturer interchangeable with that another. This involves knowledge broad range electromagnetic, geometric, microstructural, and J c ( θ,B,T ) properties,...
REBa2Cu3O7−δ (REBCO, RE = rare earth) tapes doped with 5% and 15% Zr have been scaled up to lengths more than 40 m in a pilot-scale advanced metal organic chemical vapor deposition (A-MOCVD) tool. The precursor compositions used for the long were guided by study of influence (Ba + dopant)/Cu content on critical current density (Jc) 5 15 mol.% Hf- Zr-added at 4.2 K 13 T. 40-m-long exhibited (Ic) over 4,000 A/12 mm T as well 1,400 20 densities tape measured National High Magnetic Field...
Bi-2212 wires have been produced for much of the last decade with varying architectures, powder sources, and great variability final J <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">C</sub> (B) properties. As transitions from an R&D materials development to a magnet technology, means predictably forecast becomes increasingly valuable. Here we report on characterizations short samples having (15 T, 4.2 K) 1210 6560 A/mm <sup...
In the last few years, a new type of Nb$_3$Sn superconducting composite, containing high density artificial pinning centers (APC) generated via an internal oxidation approach, has demonstrated significantly superior performance relative to present, state-of-the-art commercial conductors. This was achieved Nb-4at.%Ta-1at.%Zr alloy. On other hand, our recent studies have shown that Nb-Ta-Hf alloys can also lead dramatic improvements in performance. this work we follow up latter fabricating...