Design method of electron gun of traveling wave tube based on multi-objective optimization algorithm

Abstract

The invention belongs to the technical field of microwave electro-vacuum, in particular to an optimization design method of an electron gun of a traveling wave tube based on a multi-objective optimization algorithm. The method includes the steps of taking geometric structure parameter of the electron gun as the optimization parameter; obtaining the initial structure value of electron gun by the rapid synthesis design method, and determining the approximate range of the optimized parameters; taking the cathode emission current, beam waist radius and electron injection distance of TWT electron gun as the optimization objectives, using a new method based on non-dominated genetic algorithm NSGA-II to approximate the global optimal solution, and finally analyzing the trajectory crossover of allindividual electron beam in the optimal solution set, and selecting the solution with the best laminar flow property as the final design scheme to realize the optimization of TWT electron gun. Underthe premise that the electron gun macroscopic electric parameter cathode current, beam waist radius and range have met the design requirements, the invention considers the microscopic electron trajectory and selects the electron gun structure with the best laminar flow property of the electron beam, further improves the performance of the electron gun and has high efficiency.

Description

technical field [0001] The invention belongs to the field of microwave electric vacuum technology, and in particular relates to an optimal design method of a traveling wave tube electron gun based on a multi-objective optimization algorithm: NSGA-II (Non-dominated Sorting Genetic Algorithms II: Non-dominated Genetic Algorithms II). Background technique [0002] Traveling wave tube is a kind of microwave vacuum electronic device widely used in the fields of modern military, communication and aerospace, and plays a very important role. The traveling wave tube electronic optical system (Electronic optical system: EOS) consists of three parts: electron gun, magnetic focusing system and step-down collector. In the traveling wave tube, the electron gun is responsible for generating electron beams and endowing them with DC energy. When designing a traveling wave tube electron gun, optimizing the structure of the electron gun has a decisive effect on the gain, efficiency, and life o...

AI Technical Summary

Problems solved by technology

[0008] In view of the above-mentioned problems or deficiencies, in order to overcome the following problems faced by traditional methods: 1) manual debugging and optimization of electron guns cannot ensure the best working state, it is difficult to take into account multiple optimization objectives, and the optimization results cannot be copied; 2) single-objective optimization algorithms are difficult Taking into account multiple relatively independent optimization objectives, the electron beam obtained by the designed electron gun is difficult to ensure good laminar flow; 3) The scanning method is time-consuming and inefficient

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