电磁优化对提高Bi2223/Ag超导磁体性能的研究  

STUDY ON ELECTROMAGNETIC OPTIMIZE Bi2223/Ag SUPERCONDUCTING MAGNET

作　　者：王轶楠[1] 李永旭 白质明[1] 郭仁春[1] 何砚发[1] 王金星[1] 

机构地区：[1]东北大学物理系,沈阳110006 [2]东软数字医疗系统有限责任公司,沈阳110179

出　　处：《低温物理学报》2006年第1期21-25,共5页Low Temperature Physical Letters

摘　　要：在Bi2223/Ag超导磁体里,磁场的径向分量是限制其超导带临界电流和性能的主要因素之一.我们用有限元方法分析了螺线管超导磁体场强的分布,发现磁体两端磁场的径向分量最大,通过在其两端增加铁磁性导磁结构,优化其磁场分布,降低磁体端部径向磁场强度,提高了磁体的临界电流,增强了超导磁体承受过电流脉冲冲击的能力,并有效地加速了磁体在过电流冲击后的恢复速度.Radial component of magnetic field is one of main limits of Bi2223/Ag magnet＇ s critical current and stability. Finite Element Method （FEM） is used to analyze magnetic field distribution. And a pair of ferromagnetic disk is set on both magnet＇s end to optimize its magnetic field distribution. We measured magnet＇s critical current and recovery time after a over current pulse with and without ferromagnetic disks. The results showed that setting the disks increased the critical current and stabilize magnet.

关 键 词：高温超导磁体 有限元方法 电磁优化 Bi2223/Ag超导磁体稳定性 

分 类 号：O511.4[理学—低温物理]