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介绍了海关集装箱检测系统用９ＭｅＶ行波电子直线加速器上电子枪的结构与特点。电子枪提供的初始电子束流性能直接影响到加速管上聚焦磁场的参数要求，为保证加速器出口处电子束打靶产生的ｘ射线剂量满足阵列探测器检测图象清晰度的要求，电子枪必须提供３００ｍＡ束流。为此，利用ＥＧＵＮ程序对电子枪的电子轨迹模拟计算，研究了聚焦极与阴极间相对尺寸与位置变化，以及阴极与阳极间距对束流与发射度的影响。提供了更换部件，缩小聚集极与阴极间隙及装配尺寸的参考尺寸与理论依据。
The structure and characteristics of electron gun on 9MeV traveling wave electron linear accelerator in customs container inspection system are introduced. The initial electron beam current provided by the electron gun directly affects the parameters of the focusing magnetic field on the accelerating tube. To ensure that the X-ray dose generated by the electron beam shooting at the exit of the accelerator satisfies the requirements of the array detector to detect the image definition, the electron gun must provide a 300 mA beam flow. Therefore, the electron trajectory simulation of electron gun was simulated by EGUN program, and the influence of the relative size and position between focusing electrode and cathode, and the distance between cathode and anode on the beam current and the emissivity were studied. Provide replacement parts, reduce the collector and cathode gap and assembly dimensions of the reference size and theoretical basis.