Research On Matching Optics Unit For High Power Millimeter Wave

High power millimeter wave has broad application prospects in thermonuclear fusion research,high resolution long-range radar,material industry heating and so on.Its related technology research has become the focus of attention of scholars at home and abroad.Matching Optics Unit(MOU)is the core device in high power millimeter-wave link system.Its main function is to convert the quasi-Gauss mode output by high power gyro oscillator to HE11 mode in long-distance corrugated waveguide transmission line.Its performance directly determines the overall efficiency of the transmission link.In this paper,the theoretical and experimental research of high power millimeter wave quasi-optical matching unit is carried out to meet the development needs of domestic high power gyrotron and its supporting transmission system,which lays a technical foundation for the research of practical related devices.This thesis focuses on the following four aspects:1.The theoretical study of high power millimeter wave MOU.Based on the paraxial wave equation,the propagation characteristic function of Gauss beam is derived in this paper.On this basis,the overall design idea of MOU is preliminarily planned.At the same time,the beam correction theory is deeply studied,and the corresponding mirror optimization design tool is developed and validated,which lays a theoretical foundation for the specific MOU design.2.Electrical performance design of phase correction mirror system.Starting from the basic theory of geometrical optics,the relationship between mirror shape and output beam parameters is deduced.Optimum design is completed by combining physical optics and gradient optimization algorithm.Adaptive optimization design and Simulation of mirror shape of high power millimeter wave MOU are completed according to input and output conditions.3.Overall design of high power millimeter wave MOU structure.Due to comprehensive factors such as process and processing errors,the output beam of gyrotron is often different from the ideal beam given in design.It is necessary to fine-tune the output beam according to the actual situation in the use of MOU,so as to ensure that the basic parameters of the output beam meet the application requirements.In the structural design,the problems of installation accuracy,operation convenience and compactness need to be considered comprehensively,which is one of the key problems to be solved in this thesis.4.High power millimeter wave MOU experimental test.Combining with the optimization technology of high power millimeter wave MOU mirror,the experimental samples are processed and the high power experiments are completed.The effectiveness of the whole design process is verified in the aspects of performance,technology and structure.