Speaker
Description
No-insulation (NI) high-temperature superconducting (HTS) coils have gained attention for their high overall current density, thermal stability, and mechanical integrity. However, the time constant and the characteristic resistance in NI HTS coils, which are dominantly governed by radial turn-to-turn contact resistances, still require further investigation to examine coil specifications. Although the sudden discharge test has traditionally served as an effective method to measure the time constant, it can impose mechanical and electrical stress on the magnet. In this study, we conduct a comparative analysis of characteristic resistances using a curve-fitting method under linear charging and discharging—based on a parallel RL equivalent circuit model. To investigate how various factors affect characteristic resistance, we systematically varied the winding tension, the number of thermal cycles, and the ramping iteration. By comparing the data obtained from these experiments, we identify the conditions that enable accurate measurement of contact resistance in NI HTS coils.
