Abstract
A probe has been designed and built for measuring the magnetization critical current density Jc(B, T) and magnetic field profiles inside superconducting samples as a function of temperature in large DC magnetic fields. Magnetic field profiles provide a unique opportunity to study the spatial variation of Jc within a superconducting sample. In these measurements, a small AC field is superimposed upon a much larger DC field. This is the first flux penetration probe capable of making measurements as a function of temperature, in the range 2-30 K (accurate to 100 mK), which combines high AC fields of up to 100 mT (at 19.7 Hz) with very large DC fields of up to 17 T. The probe can be used to study short sections of superconducting cables, wires, tapes, thin films or bulk samples. Its capabilities are demonstrated by presenting variable-temperature data obtained from a commercial multifilamentary NbTi wire in magnetic fields up to 10 T.
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