Research And Implementation Of Wideband High Resolution Frequency Synthesizer

Gyroklystron belong to gyro amplifier has the characteristics of high output power and certain bandwidth,and has unique advantages in megawatt output.It has broad application prospects in electronic interference,radar,communication,controllable thermonuclear fusion,plasma heating,etc.This thesis mainly studies the Q-band megawatt-level gyroklystron,researches and analyzes the high-frequency structure design process and linear theory of the gyroklystron,optimizes the design through cold cavity analysis and particle simulation,and explores the engineering work system.The high-frequency structure of the gyroklystron in the high-order working mode,the main research contents are as follows:1.The electron cyclotron pulsation theory for high-power millimeter-wave amplifiers and gyrotrons is expounded.The working principle of the gyroklystron was studied,and the research situation of the gyroklystron at domestic and foreign was investigated and displayed;2.The basic theoretical analysis of the resonant cavity of the gyroklystron is carried out,the characteristics of the circular waveguide resonant cavity are analyzed,the single stage mutation structure is theoretically analyzed,and the cascade of the abrupt mutation is deduced.Then the theory of dielectric loaded circular waveguide is also analyzed;3.Based on the engineered magnetic field in the Q-band,the megawatt-level gyroklystron in the TE₀₁ mode was first studied.Combined with theoretical analysis and cold cavity analysis,the initial structure of the gyroklystron was designed and optimized,and the change of structural parameters was studied by numerical simulation.The law of influence on high-frequency performance;further,in order to meet the application requirements of the CERN Center accelerator,the working mechanism of the high-order TE₃₂ mode gyroklystron was further studied on the basis of the actual magnetic field of the University of Sclyde.According to the characteristics,the working mode and the competition mode are determined,and the corresponding resonator parameters are obtained;4.Completed the design of two modes of Q-band megawatt-level gyroklystron.Working in the Q-band TE₀₁ mode megawatt-class gyroklystron,the gain is about40.21d B when the operating frequency is 47GHz,and it is composed of four resonant cavities.The output power is 1.05MW,the electron injection efficiency exceeds 49.3%,and the 3d B bandwidth is 380MHz(0.81%relative bandwidth).Working in the Q-band TE₃₂ mode megawatt-class gyroklystron,the gain is about 39.47d B when the operating frequency is 47GHz,and it is composed of three resonators.The output power is2.63MW,the electron injection efficiency is about 40.5%,and the 3d B bandwidth is about 430MHz(0.91%relative bandwidth).The simulation results of the high-frequency structure of the TE₀₁ mode gyroklystron have basically reached the expected goal and have an engineering foundation;at the same time,the TE₃₂ mode gyroklystron explored will lay a technical foundation for the development of higher output power devices.5.Summarize the work content of postgraduates,put forward suggestions on the deficiencies of the work that have been done,and put forward plans for the follow-up.