| Millimeter wave source is the most important component of the millimeter wave system, it determines the performance of millimeter-wave system. Therefore, the development of millimeter-wave source that has stable performance and can output high power millimeter wave effectively becomes extremely important. At present the relatively mature high-power millimeter-wave source is cyclotron amplifier. The kyroklystron amplifier is the developed rapidly tube type of the cyclotron amplifier. Compares to Gyro-TWT amplifier, the kyroklystron amplifier has a large advantage in stability, output power and the efficiency of interaction. the kyroklystron amplifier have relatively low requirement of the velocity spread of electron beam that produced by electron gun, so it had won the attention of national research institutions and its development is the fastest in the cyclotron amplifier. However, because of the working principle and other reasons, the bandwidth of kyroklystron amplifier is relatively narrow, unable to meet the need for high power microwave source in future military and scientific research areas. Gyro-TWT amplifier becomes focus of national research at the present stage because of its relatively wide bandwidth. Countries have stepped up to the cyclotron traveling wave tube amplifier of the intensity, both in theory and practical application has made greater progress.In this paper, the numerical simulation and analysis of the Gyro-TWT amplifier that the length of interaction section of 200mm and 300mm were carried out. The main works are listed as following:1. According to existing literature, we designed the gyro-traveling-wave amplifier that the length of interaction section of 200mm of the loss dielectric loaded structure, and compiled the numerical simulation code, conducted the numerical simulation of beam-wave interaction. Then, according to simulation results, we optimized the structure dimensions and operating parameters of the amplifier. The amplifier works in the TE01-mode, and magnetic field B=0.972T. The simulation result show that the Gyro-TWT achieved output power about 400kW at 30GHz with an electron beam of 68kV and 16A, and the beam-wave conversion efficiency 36.8%, gain about 45dB and 3dB bandwidth above 2.5GHz.The designed program has been applied to the research and development of the actual sample tube by our research team, and we have been carried out hot tests on the sample tube. The test results are as following: in the band of 29GHz to 31GHz the peak power exceeded 100kW, and at the frequency of 29.8GHz, we had the maximum pulsed power 200kW, gain 33dB, electron efficiency of 18.7%.2. According to existing literature, we designed the gyro-traveling-wave amplifier that the length of interaction section of 300mm of the loss dielectric loaded structure, and compiled the numerical simulation code, conducted the numerical simulation of beam-wave interaction. Then, according to simulation results, we optimized the structure dimensions and operating parameters of the amplifier. The amplifier works in the TE01-mode, and magnetic field B=0.972T. The simulation result show that the Gyro-TWT achieved output power about 370kW at 30GHz with an electron beam of 66kV and 15A, and the beam-wave conversion efficiency 37.4%, gain about 60.5dB and 3dB bandwidth above 3GHz. |
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