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针对碳纳米管场致发射冷阴极在微波、毫米波电真空辐射源器件中的应用需求,采用2μs,20 kV的脉冲高压对碳纳米管场致发射冷阴极的脉冲发射特性进行了实验研究.通过改变阴阳极间距,对碳纳米管冷阴极发射电流特性及发生脉冲高压打火后的碳纳米管冷阴极发射特性进行了测试研究.在直径为4 mm的圆形平面碳纳米管冷阴极上获得最大发射电流16 mA,电流密度为127 mA/cm~2.以实验测试数据为基础,结合粒子模拟软件建立碳纳米管冷阴极场致发射仿真模型,给出了该仿真模型的相关参数,为下一步设计研制碳纳米管冷阴极电子光学系统及相关辐射源器件奠定基础.
Aiming at the application requirements of carbon nanotube field emission cold cathode in microwave and millimeter wave vacuum radiation source devices, the pulsed emission characteristics of carbon nanotube field emission cold cathode were experimentally studied with pulse high voltage of 2μs and 20 kV. The emission characteristics of cold cathode current of carbon nanotubes and the characteristics of cold cathode emission of carbon nanotubes after pulsed high voltage ignition have been investigated by changing the distance between the anode and the cathode.Under the cold cathode of circular planar carbon nanotubes with a diameter of 4 mm The maximum emission current of 16 mA was obtained and the current density was 127 mA / cm 2. Based on the experimental data and particle simulation software, a simulation model of carbon nanotubes cold cathode field emission was established and the relevant parameters of the simulation model were given. This will lay the foundation for the design and development of carbon nanotube cold cathode electronic optical system and related radiation source devices in the next step.