Research On Improving Technology For Space Twt Efficiency

The Space Traveling Wave Tube(S-TWT)is the key component of the launch component of the satellite communication system.Since working in the space environment,the size and weight of the launching components are greatly limited,so S-TWT needs to have performance and characteristics for high efficiency,long life,high reliability,and miniaturization.Improving the efficiency of S-TWT is one of the core technologies to ensure the quality of satellite communication systems.This article focuses on the analysis of the effects of thermal and slow-wave structure(SWS)morphology and working electron beam on the efficiency of S-TWT,proposes means and measures to improve the efficiency of S-TWT,and carries out simulation analysis and verification.First,based on the energy conversion relationship during S-TWT operation,this article analyzes various possible factors that affect efficiency;gives the categories of heat loss in the S-TWT interaction zone,derives the expressions of various heat losses in the interaction zone,analyzes the effect of heat loss on the efficiency of S-TWT;sorts out the classification and characteristics of various waves in the S-TWT interaction area,and analyzes the physical mechanism of S-TWT self-oscillation.On this basis,the causes of S-TWT "power hole" phenomenon are analyzed.Next,the thermal analysis model of the S-TWT interaction zone is established,the expressions of the thermal conduction and thermal deformation of the SWS of the S-TWT in working state are derived.The influence of the number of support rods on the temperature difference of the SWS and the thermal deformation of the helix are discussed.Based on the multi-physics coupling analysis method,the heat loss,temperature distribution and thermal deformation of the S-TWT in working state are obtained.The influence of thermal deformation on the contact thermal resistance is analyzed,and the temperature distribution results of the SWS before and after thermal deformation are compared.According to the thermal deformation simulation results,the S-TWT model after thermal deformation was established,and the effect of thermal deformation on the efficiency of S-TWT was analyzed.Then,segmented six support rods helix SWS that can compensate for the influence of thermal state is proposed.The structure and high-frequency characteristics of the structure are optimized and analyzed.The temperature distribution,thermal deformation and output characteristics of the S-TWT based on the structure are simulated and analyzed,and compared with the traditional three support rods helix SWS S-TWT simulation results.The results show that the maximum thermal deformation of the segmented six support rods helix SWS is reduced by 56% compared with the three support rods helix SWS,the backward wave oscillation(BWO)at the "power hole" is eliminated,and the output power is increased by42 W.The effect of the segmented six support rods SWS on reducing thermal deformation,suppressing BWO and improving efficiency is verified.Finally,the motion state of electrons in the working state electron beam of the S-TWT is analyzed,and the three-dimensional movement trajectory of the edge electrons in the electron beam is given.A thin-disk analysis model of the working state electron beam is proposed,and the evaluation parameters of the electron beam shape are defined.On this basis,the change law of the working electron beam shape and velocity along the SWS is obtained,and the influence of shape change and radial velocity of the working state electron beam on the efficiency of the S-TWT is analyzed.