S波段长脉冲相对论速调管放大器中杂模振荡导致的脉冲缩短抑制研究

摘要

研究了相对论速调管放大器中的脉冲缩短问题.分析表明杂模振荡是引起脉冲缩短的重要原因.利用粒子模拟对振荡的模式进行了分析，研究了振荡的机理，在粒子模拟中利用吸收介质对杂模实现了有效的抑制.最后，在实验中解决了相对论速调管放大器中的脉冲缩短问题，在输出微波峰值功率约为920 MW时将脉宽由77 ns提高到137 ns.%We have investigated the pulse shortening problem of relativistic klystron amplifier. It is shown that non-working mode self-excitation is an important cause of pulse shortening. Theoretical and numerical analyses show the mechanism of non-working mode self-excitation caused by the coupling between cavities. By the use of radio frequency absorbers, the problem of non-working mode self-excitation can be solved. In the experiment, the RF output power is 920 MW, the output power pulse width of the device can be increased from 77 ns to 137 ns.