导体结构对超导磁体最大磁场的影响

现有文献在计算超导磁体的磁场时,往往假定电流在导体截面中的分布是均匀的,而不考虑导体的具体结构。本文通过对美国威斯康辛大学5500MWh超导储能线圈设计方案在采用不同导体结构情况下的最大磁场进行计算和比较后指出,导体结构对线圈导体处磁场的分布和最大磁场的大小有很大的影响。不考虑这个因素可能对磁体的稳定和安全运行带来严重问题。文章同时指出,对于大型超导储能线圈导体的结构设计,除了要考虑传热和冷却,机械强度和制造工艺等因素外。同样需要考虑由于导体截面中电流的不均匀分布对最大磁场的影响。

INFLUENCE OF CONDUCTOR STRUCTURE ON MAXIMUM FIELD DENSITY IN SUPERCONDUCTING MAGNET

All published papers concerning the calculation of the magnetic field of superconducting magnet are usually based on the assumption that the electric current through the conductor has a uniform distribution over the cross section, without giving due considerations to the conductor structure. After calculating and comparing the magnetic fields of a 5500 MWh superconductive energy storage coil designed by University of Wisconsin with different conductor structures, this paper points out that the conductor structure has an influence on the distribution of magnetic flux and on the maximum magnetic density. Without proper consideration for this influence a severe effect on the stability and the safety of the superconducting magnet may result. The paper also points out that the influence of non-uniform distribution of the current on the cross section of the conductor on the maximum magnetic density must be considered in addition to heat conduction, cooling, stress and technology process in the design of conductor structures.