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介绍了S波段强流长脉冲相对论速调管放大器(RKA)的高频系统设计、长脉冲强流相对论电子束(IREB)的调制及微波提取等方面的实验研究结果。重点阐述了长脉冲IREB调制和输出微波中的自激振荡问题。通过采用高阶工作模式以及参差模式设置的谐振腔、提高系统安装的同心度和调节电子束参数等措施,使自激振荡得到了抑制。采用550 kV,4 kA及210 ns的环行电子束,经过优化调节RKA参数,使强流调制电子束流脉宽由50 ns增加到150 ns,同时得到了3.2 kA的基波调制电流。从该RKA得到了峰值功率580MW、脉宽140 ns的输出微波,束波转换效率26%,增益34 dB。
The high-frequency system design of S-band intense long pulse IRRS (RKA), the experimental research on the modulation and microwave extraction of relativistic electron beam (IREB) of long pulse intense current are introduced. The long-pulse IREB modulation and the problem of self-oscillation in the output microwave are highlighted. The self-excited oscillation is suppressed by adopting the resonant mode of the high-order mode and the staggered mode, improving the concentricity of the system and adjusting the parameters of the electron beam. By using the cyclic electron beams of 550 kV, 4 kA and 210 ns, the RKA parameters are optimized and adjusted to increase the pulse width of the modulated current electron beam from 50 ns to 150 ns and obtain the fundamental modulation current of 3.2 kA. Obtained from the RKA 580MW peak power, pulse width 140 ns output microwave, beam conversion efficiency of 26%, the gain of 34 dB.