The Simulation And Design Of High-power 0.42THz Gyrotron

In recent years, terahertz technology has become the forefront of the world’s major research focus countries. Thz has a strong penetrating, high signal to noise ratio, wide bandwidth, narrow pulse, low energy, but also resonates with a lot of structures of biological macromolecules, so it is used to the wide range of dual-use applications of radar, detection, medical, communications, etc. But there are many unresolved difficulties of THz. The terahertz radiation is just the one difficulty.Gyrotron was developed in the seventies of the last century as a new type of vacuum devices. Simple structure, large size compared to conventional electric vacuum devices, therefore easy to process and high power capacity, Gyrotron has made great achievements in the millimeter wave band. In recent years, with greatly improved processing technology, gyrotron is used to generate high-power terahertz wave.The high-frequency structure is an important part of the gyrotron: the beam-field interaction region, the energy exchange area. In its structural characteristics, there is a significance impact on the generation of terahertz wave and the power level. Therefore we must understand and grasp the structural characteristics. Based on resonator coupled wave theory, linear theory and self-consistent nonlinear theory of cyclotron, it is designed and researched in the thesis that a 0.42 THz gradient composite resonator cyclotron oscillator tube. The details are as follows :1. Based on the linear theory, it is researched that the coupling coefficient, dispersion curves and the most important starting current of the 0.42 THz gradient composite resonator cyclotron frequency oscillating tube. In particular, the influence of the velocity ratio of the electron beam, voltage and magnetic field on the starting current is analyzed.2. Based on resonator coupled wave theory, we design 0.42 THz gradient composite resonator cyclotron frequency oscillating tube structure, through the cold chamber simulation software to analyze effects of various structural parameters of the cavity of the high-frequency characteristics.3. Based on the self-consistent nonlinear theory, it is non-linear numerically simulated that the beam-field interaction of the 0.42 THz gradient composite resonator cyclotron oscillator tube and the influence on the beam-field interaction by many aspects of electronic horizontal and vertical velocity ratio analysis, guiding center radius, magnetic field, current and voltage.