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从线性化的Vlasov方程出发,研究了相对论返波管中产生的微波功率与磁场的关系,给出了低引导磁场相对论返波管振荡器的设计准则;设计了一个高效率的高功率返波管振荡器,通过采用过模的分段、非均匀慢波结构,实现器件的高效率、高功率运行,同时通过在慢波结构末端添加部分反射腔来降低引导磁场强度。当引导磁场强度为0.6 T、电子能量和束流分别为800 keV和7.6 kA时,采用2.5维Particle in Cell(PIC)程序模拟得到频率为9.6 GHz、功率为1.85 GW的微波输出。
Based on the linearized Vlasov equation, the relationship between the microwave power and the magnetic field in the relativistic backwave tube was studied. The design criteria of the relativistic back-dip tube oscillator with low permeability were given. A high-efficiency high-power backwave Tube oscillator, through the use of sub-modular, non-uniform structure of the slow wave to achieve high-efficiency devices, high-power operation, while the slow wave structure by adding the end of the partial reflection cavity to reduce the guidance of magnetic field strength. The 2.5-GHz Particle in Cell (PIC) program was used to simulate the microwave output at 9.6 GHz with a power of 1.85 GW when the guided field strength was 0.6 T, electron energy and beam current were 800 keV and 7.6 kA, respectively.