针对直线感应电子加速器中的束流特点，设计了一种在线式电子束能量测量方法。该方法使用分析磁铁和束位置探测器对电子束团切片平均能量进行测量，避免了束团取样带来的误差及测量过程对束流的影响，可以实现电子能量的在线测量。使用该方法对某强流直线感应电子加速器的电子束团能量进行了测量，获得了电子束团切片平均能量随时间变化的曲线，能量测量不确定度为0.177 MeV，能散度测量不确定度为0.39%。

An on-line electron beam energy measurement technique was designed for the beam characteristics of linear induction accelerator. In this technique the slice average energy of the electron beam was measured by beam position monitors and magnetic analyzer, which can avoid the errors in beam bunch sampling as well as the influence of measurement process on the beam and can achieve the on-line measurement. This method was applied in the measurement of electron energy for a high current linear induction accelerator and the slice average energy time curve was obtained, with the energy measurement uncertainty of 0.177 MeV and the energy spread measurement uncertainty of 0.39%.