A fast method of characterizing HTSC bulk material

HTSC bulk material which has been developed during the last ten years is now prepared in increasing quantities and used in demonstrators or prototypes of several applications, e.g., flywheels and motors. The quality control of large amounts of samples requires a method which is fast and provides essential information about the sample quality. In particular, the critical current density and its inhomogeneity should be determined. In this contribution we report about a trapped field measurement technique using pulsed field magnetization and field detection by a Hall-array. With this arrangement the required time of measurement is in the order of a few minutes per sample. The software which controls the devices contains also an analyzing procedure for the calculation of an effective critical current density as well as parameters describing the homogeneity of the samples.