中文摘要：

为发展场致发射冷阴极毫米波电真空辐射源器件,对利用大面积碳纳米管冷阴极产生大电流、高电流密度电子注的电子光学系统进行了研究.通过在Pierce电子枪阴极表面引入栅网结构,解决了碳纳米管冷阴极场致发射所需的强电场和电子聚束问题.在碳纳米管冷阴极实验测试数据的基础上,采用粒子模拟软件对上述电子光学系统进行了仿真.研究了栅网对注电流、注腰半径和电子注散射的影响,分析了阳极电压和外加轴向磁场对电子注的聚束作用.优化后的仿真结果表明在阴极发射面为3.03 cm2时,该电子光学系统能够产生210 mA、60 kV,电流密度为6.7 A/cm2,最大注半径为1 mm的电子注.

英文摘要：

In order to develop millimeter wave electric vacuum radiation source devices with field emission cold cath- odes, the electron-optical system using a large area carbon nanotube cold cathode （CNCC） was investigated, which can generate an electron beam with large current and high current density. By adding a mesh grid on the cathode surface of a Pierce electron gun, problems of the electron bunching and high electric field applied to the CNCC surface have been solved. Based on the experimental results of a CNCC, the field emission model was built, by using PIC simulation soft- ware, to simulate the Pierce electron-optical system. The effect of the mesh grid on the electron beam has been ana- lyzed. And the influence of the anode voltage and the axial magnetic field for the electron beam radius has been re- searched. The simulation results of the electron-optical system showed that when the area of cathode is 3.03 cm2, an e- lectron beam with 210 mA at 60 kV can be produced. The current density is 6.7 A/cm2 and the maximum radius of the electron beam is 1 mm.