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The gyrotron key technology

Author: SunXu
Tutor: ZhaoQing
School: University of Electronic Science and Technology
Course: Physical Electronics
Keywords: Coaxial inner slotted structure Cyclotron oscillator tube PIC simulation Waveguide mode conversion Faster than
CLC: TN12
Type: Master's thesis
Year: 2008
Downloads: 144
Quote: 0
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Abstract

Although the widespread use of solid-state semiconductor devices, but the electric vacuum device with its microwave, millimeter-wave band high-power, high-frequency characteristics, in some areas of application plays an irreplaceable role. Gyrotron as electric vacuum device family, an important class of microwave and millimeter wave source for controlled nuclear fusion reaction of electron cyclotron resonance heating (ECRH), radar, industrial fired, and has broad military and civilian prospects of its development has drawn worldwide attention. This work is mainly of three parts: The first part, based on the kinetic theory of electron cyclotron maser cyclotron oscillation tube analysis. Using the cyclotron oscillation tube linear theory and the equivalent surface impedance method, to study the structure of the high-frequency high power coaxial slotted cyclotron high-frequency oscillating tube; coaxial of slotted high frequency structure mode selection characteristics and mode wall loss of inhibition, 170GHz coaxial slotted roundabout tube high-frequency structure developed to provide the basis of theory and simulation. Establish 170GHz coaxial gyrotron 3D PIC simulation model, the simulation study of electron beam current, electron beam horizontal and vertical velocity ratio and longitudinal magnetic field strength and other parameters of output power, efficiency, mode purity. Optimized to obtain stable single-mode megawatt power output. The second part of the study of the TE _0n the-TE _{0 (n 1) m1-TE 11} waveguide mode converter and TE _{, < / sub> waveguide mode converter two types of high-power mode converter. Coupled wave theory, a numerical analysis of these two types of mode converter model, write the efficiency and bandwidth calculation procedures; converter for the first model, also try using a new type of non-uniform radius gradient structure. By theoretical analysis, numerical calculation and simulation the following results: (1) two types of TE _{0n-TE 0 (n)} mode converters can effectively The mode conversion, the non-uniform radius gradient mode converter has high conversion efficiency (99.5%), bandwidth in excess of 1.5GHz. (2) using the perturbative structure of the waveguide axis serpentine line TE ₀₁-TE ₁₁ mode converter, analog conversion efficiency of more than 98%, bandwidth of more than 2G third portion, the electron gun to provide electron injection performance directly affects the effect of the resonator wave interaction. Research projects in conjunction with the Department, this study design double anode magnetron injection gun and a large cyclotron electron gun, the electron gun works detailed theoretical analysis; combined PIC simulation results, a series of design changes in the parameters of the electron gun properties, such as transverse and longitudinal velocity ratio of electron injection, electron injection velocity spread the impact on the anode voltage, the magnetic field distribution to optimize the parameters of the gun body structure, PIC simulation results show that the two types of electron gun design have made excellent electron Note parameters. In particular, the traditional horizontal revolving amplifier signal input mode, the originality of the electron gun cathode coaxial signal input, the anode after the transition section for the mode shift signal input and its strict theoretical and simulated verification. Meantime, the first TE _0n the-TE _{0 (n)} waveguide mode converter and TE _{the m1 of}-TE _{11 two types of waveguide mode converter mode converter has been studied, designed to meet the requirements of the mode converter and is combined with the two types of electron gun design herein. The simulation results show that the new electron gun with its scientific and practical, this coaxial signal input to achieve the desired results. In this paper, based on a lot of reading of relevant literature, and the Department of Scientific Research, under the guidance of the instructors, coaxial high-frequency structure within the slotted waveguide mode converters and size cyclotron electron gun design some meaningful work and put forward some new ideas and methods, as follows:. coaxial inner slotted structure cavity, a detailed analysis of the impact of structural parameters on the performance of the resonator, such as the inner and outer radii of the ratio of the mode selection characteristics impact of slotting size reduction mode power loss impacts; PIC simulation has important guiding significance for future design work and engineering to achieve specific structure. Using the coupled-wave theory, research of the TE _0n the-TE _{0 (n)} waveguide mode converter and TE _m1-TE ₁₁ waveguide mode converter two types of high-power mode converter. To establish a model of the numerical analysis of these two types of mode converter, the preparation of a program for the calculation of the efficiency and bandwidth; quasi-converter for the first model, the use of a new type of non-uniform radius gradient structure, numerical analysis and software simulation results shows that the conversion efficiency and bandwidth of such a structure is considerably superior to the conventional structure. The above waveguide mode converter in the microwave and millimeter Engineering having great practical value. 3-depth study of a double anode magnetron injection gun and large cyclotron radius of the electron gun, the establishment of a three-dimensional PIC simulation model, the simulation results provide a reference for the the large cyclotron electron gun design. 4 new coaxial signal input electron gun, first proposed the structure of the waveguide mode converter add in the transition section. The PIC Simulation results show that: this new type of electron gun in the case of providing efficient signal input, and achieved with the conventional electron gun of the same excellent electron injection parameters provides adequate theoretical reference and support for the actual manufacturing and processing.}}

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