带谐振腔反射器的低磁场返波管实验研究
Experimental study of backward wave oscillator with resonant reflector operating at low magnetic field
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摘要: 谐振腔反射器到慢波结构输入端之间的漂移段长度对返波管效率有较大影响，文章对该影响进行了理论分析和数值模拟。结果表明：由于谐振腔反射器对电子束的预调制作用，返波管输出功率随漂移段长度的增加而呈现多峰值现象，在选取合适的漂移段长度时，可以显著提高其微波产生的效率。在SINUS－881加速器上开展实验，在引导磁场为0.7 T，漂移段长度为4.9 cm的条件下，实验获得了功率为700 MW，频率为8.7 GHz，脉宽20 ns的微波输出，效率约14%。实验研究证实了模拟结果的正确性。Abstract: This paper presents the results from simulative and experimental studies of backward wave oscillator(BWO) with resonant reflector operating at low magnetic field. The influence of drift tube length between the resonant reflector and the slow wave structure on the efficiency of the BWO is studied. Simulation and experimental results indicate that because of the pre-modulation effect of resonant reflector, there are several efficiency spikes at optimum drift lengths. When the applied magnetic field was 0.7 T and the drift length was 4.9 cm in the experiment, the microwave power of 700 MW with 8.7 GHz frequency and 20 ns pulse width was obtained.
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