A5023101542- Superconducting Materials and Applications
- Physics of Superconductivity and Magnetism
- Superconductivity in MgB2 and Alloys
- Electric Motor Design and Analysis
- HVDC Systems and Fault Protection
- Thermal Analysis in Power Transmission
- Microwave Engineering and Waveguides
- Advanced Condensed Matter Physics
- ZnO doping and properties
- Magnetic confinement fusion research
- Magnetic and transport properties of perovskites and related materials
- Spacecraft and Cryogenic Technologies
- Antenna Design and Analysis
- Particle accelerators and beam dynamics
- Advanced Antenna and Metasurface Technologies
- Magnetic properties of thin films
Changwon National University
2020-2025
Obuda University
2016
This article presents a numerical analysis and experiment to investigate contact resistivity distribution of no-insulation (NI) high-temperature superconductor (HTS) racetrack coil. Since the coil consists straight curved sections with continuously varing curvatures, local inhomogeneity can occur. We adopt partial element equivalent circuit (PEEC) method this inhomogeneity. A 50-turn NI HTS single pancake test is fabricated figure out discrepancy resistivity, charged up 100 in liquid...
NI (no-insulation) superconducting coils using REBCO (rare-earth barium-copper-oxide) wires have been widely applied in various magnets due to superior electric, mechanical and thermal performance. Yet, present the intrinsic drawbacks of charging delays heat losses by leakage current. MI (metal insulation) windings also proposed increase turn-to-turn contact resistance improve coil's strength. Both conduction-cooled require additional paths a cryocooler, leading use epoxies between...
Recently, structural analysis related to stress and strain has become increasingly important in the design of high-field, high-temperature superconducting (HTS) magnets using Rare-Earth Barium Copper Oxide (REBCO) tapes. Superconducting can be subjected compressive loads due various factors such as winding tension, Lorentz force, thermal contraction. Deformation is typically predicted based on material properties REBCO However, deformation behavior stacking direction under conditions,...
Implementation of the persistent current mode (PCM) provides an effective solution for mitigating thermal load on superconducting magnets used in maglev trains and addressing external power supply issues. However, HTS magnet is affected by harmonics armature coil during running operation. Notably, dynamic resistance time-varying magnetic field under DC transport generates additional AC loss. This must be considered design a quasi-persistent switch (quasi-PCS) as it causes attenuation paper...
Various high-temperature superconducting (HTS) power cables are being developed or ready for commercial operation to help energy suppliers meet the growing demand in urban areas. Recently, triaxial HTS have been by Korea Electric Power Corporation (KEPCO) and LS Cable & System. Further, KEPCO has planning install a 2 km long 23 kV/60 MVA cable connect Munsan Seonyu substations increase stability of grid. The should be cooled down cryogenic temperature near 77 K. A thermo-hydraulic...
In promoting novel products with superconducting magnets to transportation and science industries, the most important factor is reliability. Recently, it was reported that a no-insulation (NI) magnet could be damaged quenches caused by thermal runaway, significant temperature deviation, extremely high characteristic resistance, etc. To resolve this issue, numerical analysis of high-temperature (HTS) racetrack coils NI winding technology should conducted. The authors proposed homogenization...
Rare-earth barium copper oxide (REBCO) racetrack coils can be used for superconducting rotating machines to achieve higher power density than conventional ones. Unlike solenoid coils, winding turns in a straight section of coil easily move outward generating stress concentrations at the intersection and curved by tension strong Lorentz force. Abrupt change curvature intersections half circle even create singularities terms mechanical stress. Clothoid curves, whose length are proportional,...
In this paper, a planar Rotman lens featured as beamforming and multiple beams is presented, aimed at the potential use for 5G communication. The feeding network radiating patches are made single layer Taconic-microstrip structure 24-GHz area operation low cost practicality. characteristics verified by full-wave simulation which validated fabrication measurement.
The rare isotope accelerator complex for online experiments (RAON) is a heavy-ion equipped with an in-flight fragment separator (IF) system and separation technique in South Korea. Six quadrupole sextupole high-temperature superconducting (HTS) magnets are installed the hot cell of IF system, which high radiation region, to arrange ion beams correct chromatic aberrations beams. developed RAON at Institute Basic Science (IBS), Superconducting magnet systems should be capable stable operation...