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 摘要分析了直螺線管磁場(chǎng)缺陷的來源,考慮了電子束的空間電荷作用,采用數(shù)值方法模擬計(jì)算了磁場(chǎng)缺陷對(duì)電子束橫向溫度的影響,獲得了電子冷卻裝置中直螺線管磁場(chǎng)的均勻性要求。