内/外部励磁方式下高温超导环的俘获场特性

高温超导磁体在闭环运行时,可以提供稳定磁场,但是由于高温超导带材无法实现无阻焊接,成为高温超导磁体闭环运行的技术瓶颈.本文利用第二代高温超导带材制备闭环超导环,采用内部励磁和外部励磁对超导环进行励磁,在液氮温度中(77 K)测量超导环的中心俘获磁场.结果表明超导环在内部励磁俘获的磁场值比外部励磁俘获的磁场值高;外部励磁中,超导环中插入铁芯柱能提高俘获场;内部励磁中,超导环在螺线管闭环运行俘获的磁场值比开环运行俘获的磁场值高.结果对于高温超导闭环磁体励磁和高温超导带材磁通动力学研究具有很重要参考价值.

Trapped Field Characteristics of A High Temperature Superconducting Ring under Inner/Outer Excitation

High temperature superconducting (HTS) magnets provide a stable magnetic field when operating in persistent current mode (PCM).However,due to immature joint technique without resistance, it becomes the technical bottle neck of HTS magnets to operate in PCM. In this paper,the second-generation HTS tape is used to prepare for the closed loop superconducting ring. The superconducting ring is energized by inner excitation and outer excitation respectively. During outer excitation, two excitation methods,FC and ZFC excitation,were used to magnetize a superconducting ring. In order to further study characteristics of trapped field, an iron core was inserted into the superconducting ring. In terms of inner excitation,the coil section is a solenoid. A vertical solenoid and a closed-loop solenoid were used to magnetize the superconducting ringre spectively.Meanwhile,the central trapped magnetic field of the superconducting ring is measured by a Gaussmeter at liquid nitrogen temperature (77K). The results show that the trapped field of the superconducting ring in inner excitation is higher than that of the outer excitation. For the outer excitation, the insert ion of an iron core in the superconducting ring can increase the trapped field. For the inner excitation,the trapped field magnetized by the closed-loop solenoid is higher than that of the trapped field magnetized by the vertical solenoid.The results have significant reference value for magnetizing HTS magnet and HTS flux dynamics