Conduction-Coolled HTS Magnets Closed-Loop System Excited by a Rotating Magnets Flux Pump
Yujia Zhai, Chang Niu, Xinyi Liu, Feng Wang, Jianhua Liu, Qiuliang Wang
Abstract
High-temperature superconducting flux pumps usually need to work in a liquid nitrogen immersion environment, which limits their practical high-field magnet applications. In this paper, China's first conduction-coolled high-temperature superconducting flux pump with a rotating magnet structure is developed, and a non-insulated (NI) high-temperature superconducting coil with considerable inductance has been successfully excited. The vacuum dynamic sealing technology is used to isolate the rotating motor and drive leads from the low-temperature dewar, and ultimately minimize the thermal load of the flux pump, making future applications in MRI/NMR and superconducting motors/generators possible. Comprehensive measurement and analysis of parameters such as excitation current, excitation rate, magnetic field stability, and power consumption. Under the cooling conditions of the G-M cryogenic cooler in the temperature range of 30 K to 50 K, the feasibility and reliability of using the mechanical flux pump as the power source to excite the high-temperature superconducting magnet is verified.