将负载区域的电流(丝阵电流、阴极板电流、阳极板电流和回流柱电流)离散成电流线或电流面等电流微元,根据毕奥-萨伐尔定律,计算所有电流微元在指定场点的磁场,再通过叠加给出该点的总磁场.研究结果发现:在丝阵外围区域,仅由丝阵电流所产生的磁场偏离无限长直导线磁场公式的值,但全部电流所产生的总磁场与公式给出的值很接近.同时,研究了不同负载结构参数下的磁场分布,结果表明:增加丝根数有助于减小单根丝表面的局部磁场,改善丝阵外围磁场分布的均匀性.%The magnetic field around a wire-array load of Z-pinch is essential to understand the wire-array ablation and ablated plasma flowing, as well as the following implosion processes. All the currents of the wire-array, return-posts, anode and cathode were divided by many small current lines or current surfaces, whose magnetic field were calculated by the formula of Biot-Savart's law. The total magnetic field was obtained by summing all the fields contributed from all the current elements. The magnetic field contributed only by the wire-array currents deflects from the formula values of a long straight wire, while the total magnetic field is close to the formula values. The uniformity of the magnetic field in the region of the load can be improved by increasing the wire numbers, due to reduced local field on the surface of single wire.
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