Resistive Onset Determination of Coated Condutors Utilizing a Shunt Current Instead of Voltage Measurement

This is the authors' abstract. We don't add key points for this paper.

This article presents a critical current measurement on high-temperature superconducting (HTS) coated conductor tapes, utilizing a shunt current. In the experiment, a shunt resistance of approximately 40 μΩ is connected parallel to the HTS tape to divert a hundred-mA-level shunt current, which is measured by a fluxgate current sensor with much high accuracy than normal voltage measurement. The sampling bandwidth achieved was up to kHz with a resolution of 0.1 mA. Compared to direct voltage measurement, earlier detection of the flux flow resistance onset is achieved for the HTS tapes. This reduces the risk of instantaneous joule heat surges that could damage the tape, thereby significantly enhancing both the safety and accuracy of the measurement,ensuring the safety of the tape and potentially the magnets.