Speaker
Description
Previously we reported the “Defect-irrelevant” behavior of a no-insulation (NI) high temperature superconductor (HTS) pancake coil in 2016. The test coil was wound with REBCO tapes having multiple “defects” and tested in a bath of liquid nitrogen at 77 K. Coil terminal voltages and magnetic constant of the test coil are essentially identical to those of its “healthy (defect-free)” counterpart in steady-state operation below the critical current, which demonstrated a potential of the defect-irrelevant-winding (DIW) approach to build an NI magnet with a substantially reduced cost. Here we report, as a continuation to our previous study, test results of a “DIW” REBCO pancake coil operated in a conduction-cooling environment below 77 K. Our primary goal is to demonstrate the DIW approach for mid-scale industrial applications of which typical magnetic field requirements range 1 – 5 T at an operating temperature ranged 30 – 50 K. Charging tests were performed and the results were analyzed by use of both lumped and distributed models.
Acknowledgement
This work was supported by the National Research Foundation of Korea as a part of Mid-Career Research Program (No. 2018R1A2B3009249).
