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In a high temperature superconducting (HTS) DC induction heater, an HTS coil and an iron core are essential to generate DC magnetic field and form the magnetic circuit. To understand effect of the iron core on the critical current and the inductance of the HTS coil, we prepared a double pancake coil (DPC) and an iron core in this study, and measured the critical current and inductance of the DPC. The experimental results were compared with the numerically calculated ones as well. The measured critical currents of the DPC without and with the iron core are 89 A and 84 A, respectively. Thus, the iron core does affect the critical current. Moreover, the measured inductances are 6.94 mH and 45 mH. The measured data of the critical currents and the inductances are in good agreement with the calculated results

Influence of Iron Core on Critical Current and Inductance of an HTS Double Pancake Coil