Research on the Evolution Characteristics of REBCO Inductance for 19 T All-Superconducting Magnet

Institute of Plasma Physics, Chinese Academy of Sciences (ASIPP) has been focusing on high-field all-superconducting user magnet for many years. The 19 T all superconducting magnet for material testing facility consists of a 14 T/phi 150 mm low temperature superconductor (LTS) background magnet and a 5 T insert coil made by double pancake (DP) coils wound with insulated rare-earth-barium-copper-oxide (REBCO) coated conductor. Currently, it has been found that the inductance of REBCO magnet evolves with current. As an important parameter, the inductance is related to the energy storage and the quench analysis. This study analyzes the equivalent relative permeability mu(r)(H), which is brought into analyzing the magnetic field distribution to get inductance. Additionally, we developed a tested magnet and a pulsed discharge experimental platform. The results are in consistent with theoretical analysis, which shows a positive correlation between inductance and current.