Cyclotron Amplifier Simulation Studies

Based on electron cyclotron maser, gyrotron has good applied foreground in military weapon, millimeter wave radar, communication, exact control and guide and so far. For those reasons, many country has been attaching to the research of gyrotron. As a kind of gyrotron amplifier, gyroklystron has many virtues such as high efficiency, high gain and high power, while as another gyrotron amplifier, gyro-traveling wave tube has a broad bandwidth and being widely used. For the need of millimeter application, since 1980 the study aspects change to the two atmosphere ports: Ka-band and W-band, corresponding to the frequency of 34 GHz and 94 GHz.A W-band gyroklystron including a Ka-band gyro-traveling wave tube is researched in this paper. The main works are listed as following:1. For the W-band gyroklystron, the structures of input cavity, bunch cavity and output cavity are simulated with the HFSS software.2.Write the code about the 3mm-band gyroklystron's high frequency structure with the simulation software MAGIC. The results show: at 93.9GHZ,a output power of 300kw with an electronic efficiency of about 36% and a gain of 42 dB, and a 1 GHz bandwidth is obtained with a 70kV,12A electron beam and a beam velocity of 1.35.3. A new structure of Ka-band Gyro-TWT with lossy ceramic is designed, which greatly suppressed oscillations and increased the efficiency of the whole amplifier. The simulation results show, the output power of 435kWwith an electronic efficiency of about 43% and a gain of 40 dB, and a 2.2GHz bandwidth is obtained with a 68kV,15A electron beam and a beam velocity of 1.15.4. The influence of the electronic beam parameters and high frequency structure parameters on the output of both the gyroklystron and the Gyro-TWT are analyzed, and the results will provide the simulation reference for the further development of gyrotron amplifiers in the future.