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以环形电子束驱动的、正弦型周期慢波结构的相对论返波管(RBW O)为基础,设计了一种新型慢波结构的RBW O。采用数值模拟的方法对RBW O慢波结构的起始端和末端进行了优化设计,对微波工作频率进行了预测。在磁场为2.5T、二极管电压为710 kV、电流为10 kA的条件下,获得了频率为7.5GH z、微波功率为1.21GW、转换效率为26.6%的微波输出。研究结果表明这种慢波结构相对原结构在微波输出功率和转换效率上都有很大提高,微波工作频率与预测相符合。
A new type of slow wave structure RBWO was designed based on the relativistic return wave tube (RBWO) driven by a ring-shaped electron beam and a sinusoidal periodic slow-wave structure. The start and end of the RBW O slow-wave structure are optimized by numerical simulation, and the working frequency of the microwave is predicted. Under the condition of a magnetic field of 2.5T, a diode voltage of 710 kV and a current of 10 kA, a microwave output of 7.5 GHz, a microwave power of 1.21GW and a conversion efficiency of 26.6% was obtained. The results show that the relative slow-wave structure of the original structure in the microwave output power and conversion efficiency has greatly improved, microwave operating frequency consistent with the forecast.