METHOD OF ESTIMATING CRITICAL CURRENT DENSITY AND CRITICAL CURRENT DENSITY DISTRIBUTION OF OXIDE SUPERCONDUCTOR BY USE OF INDUCTION COIL

摘要

PURPOSE:To easily estimate the critical current density and critical current density distribution of the oxide superconductor without cooling the oxide superconductor to put the conductor into a superconducting state by measuring the inductance of an induction coil in the normal conducting temp. above the critical temp. CONSTITUTION:The annular induction coil 2 is installed in the sky above the surface of the plate oxide superconductor 1 in such a manner that the coil plane thereof is paralleled with the surface of the superconductor 1. The inductance of the induction coil 2 is then measured in the normal conducting temp. above the critical temp. The resistance value at the measurement point of the superconductor 1 in the normal conducting temp. is determined in accordance with the measured inductance. The critical current temp. and critical current distribution of the superconductor 1 are estimated from this resistance value.