Ruan Cunjun, Wang Pengpeng, Zhang Huafeng, Su Yiyang, Dai Jun, Ding Yikun, Zhang Zheng
School of Electronics and Information Engineering, Beihang University, Beijing, 100191, China.
Sci Rep. 2021 Jan 13;11(1):940. doi: 10.1038/s41598-020-80276-3.
A novel planar distributed three-beam electron gun with narrow beam separations is designed based on grids loaded sheet beam method. The dimensions of the three-beam gun in the y-O-z plane are determined using our basic theoretical design method developed for sheet beam gun. The results show that the profile of focusing electrode in the y-O-z plane is related to the beam width in the x-O-z plane. Then, the characteristics and parameters of three-beam array formation with their stability are analyzed thoroughly by adjustment of control grids in the x-O-z plane. Each of the beamlet obtained is with a small axial deviation of the two transverse waists. Based on the theoretical analysis and simulations, the planar three-beam electron gun is constructed with the beam voltage of 22 kV and the current of 3 [Formula: see text] 0.15 A. The average radius of 0.08 mm at each beam waist is obtained with the compression factor of 4 for the 0.18 mm beam tunnel radius. The beam waist can be achieved at about 4.4 mm away from the cathode with the axis separation about 0.46 mm for each of beamlet. Thus, the design method can be generally used to construct such type of narrow beam separation and planar distributed multiple beam electron gun for the miniaturization and integrated vacuum electron devices in millimeter wave and terahertz band.
基于栅网加载片状束方法设计了一种新型的具有窄束间距的平面分布式三束电子枪。利用我们为片状束电子枪开发的基本理论设计方法确定了三束电子枪在y - O - z平面内的尺寸。结果表明，聚焦电极在y - O - z平面内的轮廓与在x - O - z平面内的束宽有关。然后，通过在x - O - z平面内调整控制栅网，深入分析了三束阵列形成的特性、参数及其稳定性。所得到的每一个子束在两个横向束腰处的轴向偏差都很小。基于理论分析和模拟，构建了束电压为22 kV、电流为3×0.15 A的平面三束电子枪。对于束隧道半径为0.18 mm的情况，在压缩因子为4时，每个束腰处的平均半径为0.08 mm。束腰可以在距离阴极约4.4 mm处实现，每个子束的轴间距约为0.46 mm。因此，该设计方法可普遍用于构建这种窄束间距和平面分布式多束电子枪，以用于毫米波和太赫兹波段的小型化和集成真空电子器件。
