Development of high temperature superconducting REBa2Cu3Oy (REBCO, RE: Y and rare earth) coated conductors (CCs) would enable cost-effective magnet applications in rotation machines, generators for wind turbine and magnet use in medical imaging machines. To use for these applications, precipitates and structural defects with nano-meter size have been introduced in REBCO films to enhance...
In high-temperature superconducting films and tapes, optical switching are complex and are determined not only by the laser pulse energy, but mainly by its duration. Thermal processes play the main role at durations from tens to hundreds of ps. To study the physical processes occurring in an HTS tape under ultrashort laser irradiation, using the Comsol Multiphysics software, a multiphysics FEM...
GdBa2Cu3Oy (GdBCO) coated conductors is one of the most promising candidates due to its high critical temperature over 90 K and high critical current density of the order of 1 106 A/cm2 at 77 K. The presences of a-axis-oriented grains has been known to cause the worsening current characteristics, so that it is important to investigate the formation mechanism of a-axis-oriented grains. In...
The effect of the magnetic flux trapping in normal-phase fractal clusters on critical currents in percolative HTS composites is studied. The normal-phase clusters are united by the common trapped flux and surrounded by the filling superconducting phase. The superconducting phase fraction is above the percolation threshold so there is a superconducting percolation cluster which is carrying a...
Columnar defects (CDs) are useful pinning centers (PCs) not only to improve the absolute value of critical current density Jc in a magnetic field (B) but also to modify the anisotropy of Jc of high Tc superconductors: the modification of Jc by installing CDs in a controlled manner can be one of key technologies for superconducting magnet applications using REBa2Cu3Oy coated conductors....
We have fabricated Ce and La co-doped Gd123 thin films on LaAlO3 single crystal substrates by the fluorine free metal organic deposition method (FF-MOD). From our previous study, it is confirmed that Ce doping is effective in introducing artificial pinning centers (APCs) into GdBa2Cu3Oy coated conductors. In addition, La doping promotes...
We performed characterization of superconducting properties of production 2G HTS wires based on YBCO with Y2O3 nanoparticles, which were developed recently specifically for application in high magnetic field [1], including magnets for compact fusion reactors and particle accelerators. We measured magnetization curves using vibrating sample magnetometer (VSM) in the Quantum Design PPMS (in the...
