强磁场屏蔽有限元设计

Strong Magnetic Shielding Design by Finite Element Method

在国际热核聚变实验堆计划中,为降低磁场对电磁阀的影响,必须将电磁阀周边磁场从2000Gs降低到50Gs以内。本文通过有限元分析软件计算分析和实验测量相结合对2000Gs的强磁场的屏蔽进行了设计。计算和实验结果表明,高饱和磁感应强度材料对强磁场屏蔽效果较好,可有效降低材料厚度。磁场方向对磁屏蔽效果有着明显影响,当磁场方向与磁屏蔽罩轴向垂直时,屏蔽效果最好。

The magnetic field strength around electromagnetic valve must be decreased from 2000 Gs to 50 Gs to en- sure the electromagnetic valve work well in ITER project. Magnetic shielding under 2000 Gs was computed through finite element method. The comparison between computed results and the experiment results are listed in the article. The results indicate that the material with high saturation magnetization work well in strong magnetic field. The results also indicate that the orientation of magnetic field influences the magnetic shielding performance. When the orientation of mag- netic field is perpendicular to the axis of magnetic tube, the magnetic shielding performance can be better.