基于圆盘加载波导的THz分布作用振荡器的数值模拟

摘要

提出了一种新的基于真空电子学的THz源--基于圆盘加载波导的THz分布作用振荡器(EIO),它由圆盘加载波导输入谐振腔、漂移管和输出腔构成.利用2.5维电磁仿真软件UNIPIC对其进行了模拟研究,结果表明慢波结构的长度、漂移管的长度和输出腔的半径对输出功率和频率产生显著影响.经过最优化设计,在注电压为24.85 kV、电流为20 mA的条件下,仿真得出其中心频率为755.5 GHz、峰值功率为1.3225 W的THz波.%The extended-interaction oscillator with disk-loaded waveguide is presented as a new terahertz vacuum electronic radiation source. The device consists of an input cavity resonator with disk-loaded waveguide, a drift tube and an output cavity. A two and one half dimensional electromagnetic particle-in-cell simulation code is used to investigate it and the results demonstrate that the total length of the slow wave structure, the length of the drift tube and the radius of the output cavity affect the output power and frequency remarkably. Itis found that under the condition of the electron beam with voltage 24. 85 kV and current 20 mA, peak output power of 1. 322 5 W at 755.5 GHz can be generated.