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研究了内扩散法Nb3Sn多芯线材随温度和磁场变化的磁化曲线及磁化率，绘出了磁化量-磁场-温度（M－H－T）的三维临界曲面，归一化后的磁化曲线基本符合Kramer拟和方程。计算得到的Nb3Sn多芯线材有效直径比芯线的原始几何尺寸要大，其原因在于微观结构中存在着“桥梁”，分析表明，多余的磁滞损耗来自于“桥梁”。交流磁化率X′和X″在给定频率和背景磁场下，随交流振幅的变化很小，在给定交流振幅下，随交流频率的变化而变化，其受到的耦合主要来自于“桥梁”而不是近程效应的耦合。
The magnetization curve and magnetic susceptibility of Nb3Sn multi-core wire with inner diffusion method with temperature and magnetic field are studied. The three-dimensional critical surface with magnetization-magnetic field-temperature (M-H-T) is plotted. The normalized magnetization curve Consistent with Kramer equation. The calculated effective diameter of Nb3Sn multi-core wire is larger than that of the original wire because of the existence of “bridges” in the microstructure. The analysis shows that the extra hysteresis loss comes from the “bridge”. Under the given frequency and background magnetic field, the exchange susceptibility X ’and X “change little with the amplitude of the AC amplitude, and vary with the frequency of the AC under a given amplitude. The coupling is mainly from the” bridge " Rather than the coupling of short-range effects.