Based on the electron gun of SDS-3 electron beam lithography machine the concave hyperboloid Wehnelt ( oxide-coated cover ) of accelerator is discussed . The electron trajectories and potential distribution are given .

以SDS3电子束设备的电子枪为基础，讨论了双曲凹面加速器 维纳尔（ 外敷 碱土 金属氧化物盖）的电子轨迹与能量分布。