| With the rapid development of China's aeronautics and astronautics,the domestic demand of high performance space helix traveling wave tube is increasing in our country,and also have high demand for the design and development of high performance space traveling wave tube.At present,the development of the traveling wave tube in our country is mainly based on the theoretical research guiding the design of the helix traveling wave tube.This method is of low precision,great difficulty,relatively large error and low efficiency.Especially,the beam-wave interaction is the most important.It is difficult to analyze the complicated beam-wave interaction with theoretical research,which brings great influence and inaccuracy to the design and development of the tube.Qualitative.With the appearance of various numerical algorithms and their wide application in electromagnetics It is possible to analyze the process of complex helix TWT beam-wave interaction,However,due to the differences of various numerical simulation methods,and single numerical software for beam-wave interaction simulation exists or design optimization efficiency is low,or the calculation accuracy is not high.At the same time,the simulation calculation mainly adopts the separation simulation of the electronic optics,the high frequency circuit or the interaction process of the injection wave,and there is no integrated simulation calculation of the whole tube of the traveling wave tube.Therefore,it is great significance and value to guide the design and development of the traveling wave tube by the accurate and effective numerical simulation of the beam-wave interaction and the method of the whole tube simulation.In this paper,we will numerical simulation study the beam-wave interaction of TWT with different numerical simulation software.We choose a Ku band helix TWT with an initial high frequency structure as an object of study.First,the MTSS software based on analytic theory and finite element algorithm used to make rapid parametric numerical simulation analysis and design optimization for the beam-wave interaction.The comprehensive analysis results and simulated data used to design a reasonable cut off,a effective centralized attenuator model and a high efficiency pitch distribution.The power of the tube is over 120 W in the whole band of 12GHz-17 GHz,the electronic efficiency is over 16%,and the gain is more than 30 dB.The process of MTSS for rapid design of beam-wave interaction is realized.Then,based on the CST software of PIC particle simulation,we further verify the performance of the above tube and analyze the difference.First:design a 50 optimized coaxial input and output structure,so that voltage Bobbi in 12GHz-18 GHz frequency band is below 1.5;Using the PIC particle simulation method verified the performance of the tube with same structural parameters.and achieve the cutting and concentrating attenuator designed by the MTSS is obtained.the pitch jump distribution can suppress the back wave oscillation,improve the performance of the tube and suppress the harmonic amplification;Finally,the PIC particle simulation results show that the output power of the whole band is greater than 108 W,the gain is greater than 31 dB,and the electronic efficiency is more than 15%.The results of this two software is very close,it provides an important basis and accurate reference for actual pipe management,simplifying its tedious nature.Finally,we simulation study of complete tube with electronic gun,beam-wave interaction and collecting pole model.We designed the electronic gun and collecting pole model.With the method of particle data import and integration of whole tube to analyzed the beam-wave interaction of htwt.It will provide valuable reference for the design and manufacture of actual htwt in the future. |
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