An inductively-loaded two-cavity wide-gap klystron amplifier (WKA) with high power injection driven by a relativistic backward wave oscillator (RBWO) is studied theoretically and experimentally for solving the problem of power insufficiency of existing seed sources. The electric power of the amplifier and oscillator is supplied by a single accelerator capable of producing dual electron beams. The main switch is electrically triggered to stabilize the diode voltage and the frequency of the RBWO. In the experiments, the frequency and phase of the WKA are locked by the RBWO. The relative phase difference of the applied microwave devices is locked within ±16° in a single shot, and a phase jitter of ±11° is obtained within a series of 4 shots with a duration of about 40 ns. Under a diode voltage of 530 kV and injection power of about 22 MW, an output power of 230 MW is a-chieved from the RBWO-WKA system with a conversion efficiency of approximately 11 % and power gain of approximately 10 dB.%在大型功率合成阵列中,为解决现有种子源输出功率不足的问题,提出了利用相对论返波振荡器作为种子源锁定大间隙速调管放大器频率和相位的思路,并进行了由一个相对论返波管驱动一个高功率注入两腔大间隙速调管放大器的理论和初步实验研究.实验结果表明:大间隙速调管的频率被相对论返波管锁定,两个微波源的实时相位差在单脉冲内锁定在±16°之内,多脉冲间的相对相位差锁定在±11°之内,锁相时间约40 ns；在注入功率约22 MW时,大间隙速调管的输出功率约230 MW,增益约10 dB.
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