宏观尺寸弯曲石英管对中低能电子束的导向作用

Guiding Effect of Mediate and Low Energy Electron-beam by Macro-sized Bended Quartz Tube

研究了宏观尺寸的弯曲圆柱形石英管对1100,1300和1500eV3种能量电子束的导向作用,并对实验结果与相同材质和尺寸的直管的情形进行了分析对比。实验中利用一个位置灵敏法拉第筒对从石英管出射的电子束进行探测,获得从管道中出射的电子束流强度在位置灵敏法拉第筒各道上的分布,其结果显示宏观尺寸石英管对电子束存在导向作用。与慢速高电荷态离子和绝缘毛细管相互作用的物理过程类似,这种导向效应是由电荷在管壁内表面自组织充电引起的。实验还发现,入射电子束流的强度越强,其导向作用越明显,这与微观尺寸毛细管对慢速高电荷态离子的导向作用不同。石英管导向能力与管的尺寸、形状及材料之间的关系还有待进一步的系统研究。

It was inevstigated in the experiment that the guiding effect of electron beam with energy of 1100, 1300 and 1500 eV through a bended cylindrical quartz tube with macro-sized. A position sensitive Faraday cup was developed and used to detect the electron beam transmitted through the quartz tube, and the distribution of transmitted beam current on each channel of the Faraday cup was acquired. Results indicate the existence of guiding effect which is due to the self-organized charge-up in the inner wall of the quartz tube similar to that of the highly charged ions. We also found that the guiding ability of the tube is related to the incident beam intensity. The relationship between the guiding ability and the material as well as the size of the tube is to be studied in the near future.