Preliminary Experiments of a Self-Adaptive Linear-Motor Type Flux Pump

This paper presents the fabrication of a self-adaptive linear-motor type flux pump for dedicated magnetic resonance imaging (MRI) magnets. This kind of high temperature superconducting (HTS) flux pump could be used to magnetize the second generation (2G) HTS double-pancake coil (DPC). We plan to use this flux pump to charge the 10 no-insulation (NI) DPCs. The structure design and operational principle have been described. We have carried out preliminary experiments to measure the magnetic field at different positions of the flux pump. Our design goal is to make the current provided by this flux pump comparable to conventional superconducting DC power supplies. Compared with the traditional power supply method, using this flux pump eliminates the current leads that cause heat leakage. With further optimization and design, this flux pump can reach the kiloampere level and is expected to be applied to superconducting dedicated MRI magnets.