Title :
Evaluation of Magnetic-Field Distribution by Screening Current in Multiple REBCO Coils
Author :
Ueda, Hiroshi ; Ishiyama, Atsushi ; Ariya, Yuta ; Tao Wang ; Xudong Wang ; Agatsuma, Koh ; Miyazaki, H. ; Tosaka, T. ; Nomura, Shunji ; Kurusu, T. ; Urayama, Shinichi ; Fukuyama, Hidenao
Author_Institution :
Res. Center for Nucl. Phys., Osaka Univ., Ibaraki, Japan
Abstract :
In a superconducting coil using a REBCO tape, a large screening current is induced by the magnetic field perpendicular to the tape. The irregular magnetic field generated by this screening current affects the magnetic-field distribution in high-field magnet applications, which require a magnetic field with high accuracy and temporal stability. Therefore, in these applications of the REBCO coil, we have to investigate and suppress the influence of the screening current in the REBCO tapes. In this study, we carried out experiments and numerical simulations focusing on the irregular magnetic field generated by the screening currents in multiple-REBCO-coil models assuming real operations in magnetic applications such as NMR/MRI system. The results of the numerical simulation are in good agreement with the behaviors of the screening field observed in the experimental results. In addition, we discussed the differences in the screening field for various excitation conditions using the numerical results of the current distribution in the coil.
Keywords :
current distribution; high-temperature superconductors; magnetic fields; superconducting coils; REBCO coil; REBCO tape; current distribution; high-field magnet applications; irregular magnetic field; magnetic applications; magnetic-field distribution; screening current; screening field; superconducting coil; Coils; Current distribution; Magnetic field measurement; Magnetic fields; Magnetic resonance imaging; Probes; High-temperature superconductivity (HTS); REBCO; magnetic-field distribution; screening current;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2014.2371133