分析了直螺线管磁场缺陷的来源，考虑了电子束的空间电荷作用，采用数值方法模拟计算了磁场缺陷对电子束横向温度的影响，获得了电子冷却装置中直螺线管磁场的均匀性要求. 结果表明，当相对磁场缺陷小于1×10-3时，影响可以被忽略.
In order to obtain the tolerance requirement for the magnetic field homogeneity of the solenoids in electron cooling device, the source of the magnetic imperfection and its influence on the transverse temperature of electron beam were investigated by means of numerical simulation, and taking the space charge effect of electron beam into account. The calculated result shows that the influence of the imperfection of magnetic field will be negligible when the relative magnetic field perturbation is less than 1×10-3 .
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