Experimential study of multipactor induced by electrons waveguide
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摘要: 针对宇航微波器件功率密度越来越大，空间电子可能诱发微波器件发生微放电的潜在威胁，通过设计特殊波导结构，利用电子枪提供的种子电子入射到特殊波导内，在波导内通入大功率微波信号，利用检波器和示波器分别检测透射波形和反射波形，观察微放电现象的持续过程；改变电子入射能量，观测到不同程度的微放电现象，该电子枪提供种子电子诱发波导微放电效应的实验方法为微波器件微放电效应研究提供了重要手段。Abstract: With the increasing power density of aerospace microwave devices, the possibility of multipactor effect in microwave devices is greatly increased. In view of the potential threat that space electronics may induce the multipactor discharge in microwave devices, a special waveguide structure was designed to study the multipactor discharge. The electron gun provided electron into special waveguide when high power microwave signal were introduced into the waveguide. The power detector and oscillograph were used to detect transmission waveforms and reflection waveform respectively. The continuous process of multipactor phenomenon was obviously observed. This work verifies that electron beam can induce multipactor phenomenon and provides an important means to study multipactor effect of microwave devices.
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图 1 微放电间隙电压与fd的关系曲线[14]，其中射频频率为f(GHz)，间隙宽度为d(mm)
Figure 1. Dependence of the gap voltage on the product of the frequency and gap separation (fd). Here, f is the frequency in GHz and d is the gap separation in mm
图 5 透射波形对比图
Figure 5. Comparison of the transmission waveform and incident waveform without the electron emission
图 6 透射波形对比图
Figure 6. Comparison of the transmission and incident waveform with the electron emission
图 7 反射波形放电前后对比图
Figure 7. Comparison of the reflected waveform without or with the electron emission
表 1 大功率微波源性能参数
Table 1. Parameters of high power microwave source
operating frequency/GHz frequency bandwidth/MHz peak output power /kW microwave pulse output width/μs duty cycle/% 9.7 100 10 1 0.1 
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