Study And Simulation Of W-band Gyroklystron Amplifier

As a kind of fast wave devices based on the relativistic electron cyclotron maser, Gyrotron uses the relativistic mass effect of the cyclotron electron in magnetic field to result in the clusters and electron beam-wave interaction. Gyrotron has excellent performance in millimeter and sub-millimeter wave bands with producing high power and high efficiency, and has great prospect in certain technology and civilian. As one of very important member in the gyrotron’s family, gyroklystron amplifier has high power, high efficiency and high gain with moderate bandwidth, and is widely concern in international community.This paper analyzes the theory and numerical simulation of the gyroklystron amplifier works in the W-band and TE01 mode. The detail work on electronic gun and beam wave interaction has been done. The main work made in this paper is below:1. Based on the field matching theory, the resonators of the high frequency structure were analyzed and calculated. And established the input cavity, cluster cavity and output cavity models, then used HFSS and CST to simulate and optimize. Discussed the influence of various parameters on the resonant frequency and quality factor Q of the resonator, and got pure TE01 mode cavities at 94 GHz.2. Detailed study and design on Magnetic injection electron gun. Simulated size and established a model of single anode electron gun with particle simulation software MAGIC, and got the desired results.3. According to the results of the optimization of each resonator, established particle model of high-frequency system with MAGIC software wave. Analyzed effects on the output power and efficiency impact by the drift segment size, coil magnetic field, the electron beam voltage, current, anddrift segment size, coil magnetic field, the electron beam voltage, current, and the velocity ratio. At last, got the structure of 4-cavities, W wave-band gyroklystron amplifier. The result show: output power of 362 kW with electronic efficiency of about 32% and gain of 37 dB. And provide a basis for development of W-band gyroklystron in the future.