设计了工作在X波段的同轴多注相对论速调管放大器，建立了带输入、输出波导结构的三维整管模型，采用三维电磁粒子模拟软件对其高频特性进行了优化设计，对电子束经过输入腔后的束流调制、注入微波吸收情况、中间腔对束流的调制以及输出腔的微波提取情况进行了模拟研究．在输入微波功率为70kW ，电子束束压为600kV ，束流为5kA ，轴向引导磁感应强度为0．6T的条件下，输出微波功率达到了1．3GW ，效率为43％，增益为42dB ，在较低的输入微波功率和较小的轴向引导磁感应强度的情况下，模拟实现了X波段RKAGW级的微波功率输出．%The three-dimensional whole tube model for an X-band coaxial multi-beam relativistic klystron amplifier is de-signed .With the integrated model ,the high frequency characteristic analysis and the tube are presented .A three-dimensional full electromagnetic particle in cell code is used to simulate the absorption of injected microwave ,and the fundamental harmonic modu-lated current when electron beams propagate through the input cavity and idler cavity gaps have also been simulated .A 1 .3GW av-eraged microwave power over the oscillator period is generated by simulation with 600kV electron beam voltage ,5kA current and 0.6T leading magnetic induction intensity ,the frequency is 9.37GHz and the efficiency is 43% .
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