MgB_2/Fe超导磁体磁场分布的数值分析  

Numerical Analysis on Magnetic Field Distributing of MgB_2/Fe Superconducting Magnet by Finite Element Method

作　　者：杜晓纪[1,2,3] 金明剑[1,2,3] 李晓航[1,2] 张东[1,2] 肖立业[1,2] 张国民[4] 

机构地区：[1]中国科学院应用超导重点实验室,北京100190 [2]中国科学院电工研究所,北京100190 [3]中国科学院研究生院,北京100039 [4]中国人民解放军信息工程大学,河南郑州450052

出　　处：《稀有金属材料与工程》2008年第A04期319-322,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(50677067);全国博士学位论文作者专项资金资助项目(200750)资助

摘　　要：为了获得高分辨率的稳定清晰图像,用于磁共振成像(MRI)系统的超导磁体应在一定区域内产生高均匀度的磁场,而MgB2/Fe超导带材中的Fe包套材料的磁化作用会影响到空间磁场的分布。因此在设计基于MgB2/Fe复合超导带材的MRI超导磁体时,Fe对磁场分布的影响是需要考虑的关键问题之一。本文使用有限元方法计算MgB2/Fe超导带材的工程磁导率μeng,并在此基础上研究Fe的非线性磁化特性对磁体磁场分布的影响,可为MRI用MgB2/Fe超导磁体的应用提供分析方法上的依据和参考。The superconducting magnet for Magnetic Resonance Imaging （MRI） system must produce a high-homogeneous magnetic field to get high definitional image. But the non-linear magnetization characteristic of Fe affects the magnetic field distribution of MgB2/Fe superconducting magnet. Therefore the effect of Fe-magnetization on magnetic field distribution must be calculated in designing the MgB2/Fe superconducting magnet for MRI. In this work, the MgB2/Fe tape is described as a homogeneous material with the engineering permeability μeng（B） that was calculated from the unit cell model by finite element method （FEM）, based on that the effect of Fe-magnetization on magnetic field distribution is analyzed in detail. The results can give some useful reference in the design of MgB2/Fe superconducting magnet for MRI.

关 键 词：Fe包套 MGB2 超导磁体 磁场分布 MRI 

分 类 号：TM265[一般工业技术—材料科学与工程] TM271[电气工程—电工理论与新技术]