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为探索新型高效率微波器件,受其它带慢波结构器件的启发,设计了由微波预调制腔、慢波结构腔和微波提取腔组成的新型虚阴极振荡器。研究表明,由于慢波结构的存在,束-波转换效率高于普通虚阴极振荡器,在电压550kV、电流16kA下,可以获得频率为1.95GHz,1.4GW的周期平均功率,16%的转换效率。随后在加速器平台进行了初步的实验研究,获得了辐射功率约600MW,频率约1.94GHz的微波输出,频率单一,可实现锁频。分析知,由于阴极制作过程导致电子发射不均匀是影响效率的主要原因。实验所测得的束-波转换效率达5%,表明该结构的高功率微波器件可以提高束波转换效率。
In order to explore the new high efficiency microwave device, inspired by other devices with slow wave structure, a novel virtual cathode oscillator consisting of a microwave pre-modulation cavity, a slow wave structure cavity and a microwave extraction cavity was designed. The results show that due to the existence of the slow-wave structure, the beam-to-wave conversion efficiency is higher than that of the ordinary virtual cathode oscillator. Under the condition of voltage of 550kV and current of 16kA, the average periodic power of 1.95GHz and 1.4GW can be obtained, and the conversion efficiency of 16% . Subsequently, a preliminary experimental study on the accelerator platform was made, and a microwave output with a power of about 600 MW and a frequency of about 1.94 GHz was obtained. With a single frequency, the frequency locking can be achieved. Analysis shows that due to cathode production process leading to uneven electron emission is the main reason for the impact of efficiency. The beam-to-wave conversion efficiency measured by the experiment reached 5%, indicating that the structure of high-power microwave devices can improve the beam-to-wave conversion efficiency.