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论文对0.34 THz大功率过模表面波振荡器进行了模拟设计和初步实验研究.针对高过模比(D/λ≈6.8)慢波结构,根据小信号理论选择了合适的慢波结构尺寸和电子束距壁距离,实现了器件在表面波TM01模的π点附近谐振.根据PIC模拟结果,表面波振荡器可以实现频率和功率分别为0.34 THz和22.8 MW的太赫兹波输出.采用微细电火花加工技术完成了不锈钢慢波结构的一体化精细加工,并基于小型化脉冲功率驱动源搭建了实验装置.初步的实验结果表明,在电子束电压和电流分别约为420 kV和3.1 kA时,0.34 THz大功率过模表面波振荡器输出脉冲的频率范围为0.319—0.349 THz,辐射功率不小于250 kW,脉宽约为2 ns.最后分析讨论了实验输出功率与模拟结果相差较大的原因,为表面波振荡器的性能改善奠定了基础.
In this paper, we simulate the 0.34 THz high-power over-mode surface wave oscillator and study it for the first time.Aiming at the high-modulus (D / λ≈6.8) slow-wave structure, we choose the appropriate slow-wave structure size The distance between the electron beam and the wall enables the device to resonate near the π point of the surface wave TM01 mode.According to PIC simulation results, the surface wave oscillator can achieve terahertz wave output with frequency and power of 0.34 THz and 22.8 MW respectively. The spark machining technology completes the integrated precision machining of the stainless steel slow wave structure and the experimental device is built based on the miniaturized pulsed power drive source.The preliminary experimental results show that when the electron beam voltage and current are about 420 kV and 3.1 kA respectively, 0.34 THz high-power over-mode surface wave oscillator output pulse frequency range of 0.319-0.349 THz, radiation power of not less than 250 kW, pulse width of about 2 ns.Finally analyzed and discussed the reasons for the experimental output power and simulation results vary greatly , Lays the foundation for the improvement of surface wave oscillator’s performance.