摘要
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.
In the field of high power microwave devices,pulse shortening phenomenon hindering the improvement of microwave output energy is still an unresolved problem.In this paper,we study the influence of changes in the electron beam parameters upon pulse shortening in the relativistic backward wave tube(RBWO) by means of the particle-in-cell method.The research indicates that the expansion of the beam generated from the cathode is not a primary factor causing pulse shortening,when the pulse width is less than 100 ns.However,when the pulse width is much longer,the factor is important.Furthermore,the fluctuation of the beam voltage and current can cause pulse shortening.
出处
《西南民族大学学报（自然科学版）》
CAS
2006年第2期303-307,共5页
Journal of Southwest Minzu University(Natural Science Edition)
