Self-field measurements of an HTS twisted stacked-tape cable conductor

•Self-fields of a twisted stacked-tape cable (TSTC) conductor were measured.•A 650 mm diameter single turn coil wound with the TSTC conductor was used as a sample.•The current distribution of the TSTC was analyzed based on the self-field measurements. For a twisted stacked-tape cable (TSTC) conductor composed of REBCO tapes, self-field measurements were conducted with Hall sensors. In the measurements, a 650 mm diameter single turn coil wound with the TSTC conductor, which was made with 48 REBCO tapes whose width was 6 mm, was utilized as a test sample. Based on the measurement results, the current distribution of the TSTC conductor was investigated with analytical models. The analytical results indicate the current distribution of the TSTC is uniform under the condition that the operating current is 10 kA and the sample temperature is approximately 30 K. On the other hand, the current distribution is not uniform at the excitation and the degauss of the TSTC conductor with the ramp rate of 50 A/s.