对径向电子束在浸没式聚焦条件下的传输特性进行了理论分析, 得到了束流传输过程中轴向扩张幅值与外加引导磁场强度之间的解析表达式。阐述了螺线盘在空间中任意一点产生磁场的理论, 给出了通以相反方向电流的螺线盘之间磁场的分布规律。设计了一种基于螺线盘聚焦径向电子束的引导磁场系统, 并对电子束的传输特性进行了仿真研究, 结果表明径向电子束能够在设计的引导磁场系统下实现束流的稳定传输。

The transmission characteristic of radial beam under an immersive focusing magnetic field is analyzed, and the analytic expression of beam’s axial expansion is derived theoretically. Then the theory of magnetic field generated by coils at any point in the space, with the law of magnetic field distribution in a pair of plane coils with different current direction is given. A kind of guiding magnetic field system based on plane coils is designed. The distribution of the magnetic field generated by the guiding magnetic field system along the beam channel and the particle trajectory under stable transmission is researched through simulation.