The phase property is an important parameter of the intense relativistic klystron amplifier (RKA).But the intense relativistic electric beams (IREBs) with a long rise time in terms of high-power pulse power source will cause the output microwave phase jitter when driving the RKA,which limits the RKA''s applications.Based on the intense current pulse electron beam properties,the impacts on output microwave phase by the increase of the electron beams'' energy in the front section of the pulse and the spurious frequency caused by energy change in the cavities are analyzed through the theory.And then some PIC simulations and experiments are studied.It is found that the increase of the electron beams'' energy in the front section lead to the output microwave phase continually changing.Besides,the spurious frequency in the cavity caused by the front section of the electron beams,which lead to the output microwave phase continually jitter in the front and the early of the stable section of the pulse.In the condition of cavities'' parameters are constant,the output microwave phase is significantly affected by the rate of electron beams energy in the front section:when the rate of electron beams energy increase,the amplitude of the phase jitter and the jitter duration increase.And the stabilization of the phase can be increased by reducing the Q of the cavity at the frequency point of the spurious frequency.%相位特性是强流相对论速调管放大器(RKA)的一个重要特征参数,而由高功率脉冲功率源产生的具有一定前沿的强流相对论电子束在驱动RKA时,会使得输出微波出现较大波动,影响RKA的输出微波相位稳定性及其应用.论文从强流脉冲电子束前沿分布状态出发,理论分析电子束前沿束流能量变化及其激励的腔体杂频对输出相位的影响,同时开展粒子模拟研究以及实验研究.研究结果表明:脉冲前沿段电子束能量变化将导致输出微波相位持续变化;此外,电子束前沿将激励杂模,导致输出微波相位在脉冲前沿段及平顶段初期持续抖动,在腔体参数一定条件下,脉冲前沿能量变化率越大,相位波动幅值越大,持续时间越长,通过减小杂频振荡频率处腔体的Q值可以有效缩短输出相位抖动时间,提高输出相位稳定性.
展开▼
