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脉冲缩短是高功率微波器件中普遍存在的现象,它妨碍了输出微波能量的进一步提高.迄今为止,它仍是高功率微波研究领域中一个尚待解决的问题.本文以相对论返波管为例,用数值模拟的方法研究了电子注参数改变对脉冲缩短现象的影响.研究表明,当该器件运行于脉宽小于100ns的短脉冲时,阴极所发射电子注的膨胀不是导致其中产生脉冲缩短现象的主要因素,但其运行于长脉冲时,则为一重要因素;电子注电压和电流的脉动也会引起脉冲缩短.
Pulse shortening is a ubiquitous phenomenon in high-power microwave devices, which hinders the further increase of the output microwave energy, so far it is still a problem to be solved in the field of high-power microwave.In this paper, , The influence of the change of the electron injection parameters on the pulse shortening was investigated by numerical simulation.The results show that the pulse expansion of the cathode does not result in the pulse shortening when the device is operated on a short pulse with a pulse width less than 100ns , But it is an important factor when it operates on a long pulse; the pulsations of the electron injection voltage and current also cause a pulse shortening.