Homogenous magnetic field generation by high-Tc oxide superconductors

Recently, there are many reports on high performance high-Tc 123 bulk superconductors and applications of various magnetic field environments realized by such high performance 123 bulk materials. Realization of homogeneous magnetic field for industrial NMR/MRI system is also an interesting subject. Since the current density distribution in a 123 bulk superconductor field cooled (FC) in a magnetic field lower than maximum trapped field is identical to a thin solenoid coil, we tried to realize a homogeneous field generation by a pair of high-Tc bulk material in a Helmholtz arrangement. This paper reports computer simulations and experimental results of high homogeneity magnetic field generation by use of a pair of high-Tc 123 bulk super-conductors in a Helmholtz arrangement.