Design And Optimization Of Electron Optics For High Power Gyrotron

Microwave electronic vacuum device is a kind of electronic system in a vacuum state that use the charged particles in the movement between electrodes in order to achieve the oscillation or amplification of microwave signals.With the development of radio technology,people want to use the higher frequent electromagnetic waves to transmit information,Scientists have successively invented magnetron,klystron,TWT,gyrotron and relativistic device.Microwave electric vacuum devices relative to semiconductor devices have great advantages,with the wide range of output power can reach the GW magnitude and high working frequency.Compared with solid state devices,vacuum electronic devices can bear the effects of nuclear radiation and other electromagnetic radiation,it is an important device in space equipment.The emergence of gyrotron has great significance so that microwave vacuum devices can operate at higher frequency and can obtain higher output power.High power gyrotron is a new type of millimeter wave device based on the stimulated radiation of electron cyclotron resonance.Compared with common microwave tubes,its output power is higher and the working frequency range is wider,so gyrotron has great application prospect in EW,radar communication and biomedicine.The magnetron injection electron gun is a key part of the gyrotron and directly affects the performance of the gyrotron,its function is to form an electron beam with high transverse energy and small velocity spread.This paper combines the specific research project,based on the theory of electron optics,the electron gun of high power gyrotron is simulated by using the corresponding particle simulation software and the collector defocusing system is designed by using the electromagnetic field analysis software.The contents work of this article is as follows:1.Based on Maxwell's equations,it described the theoretical basis of electron optics in detail and analyzed the design process of electron guns.Using CST and MAGIC to simulated the electron gun,it analyzed systematically the key factors that influence the performance of electron beam and designed a single anode magnetron injection electron gun with a speed ratio of 1.3,a lateral velocity dispersion of 6.8%,and working on 105 GHz.2.This paper studied the movement of the electron beam in the collector region of the gyrotron,the AC defocusing coils is designed for the collector using the CST and MAGIC software.The width of the original drop point of the electron beam is 3.33 cm,under the function of the defocusing coils,the drop point of the electron beam is swept back and forth in the range of 46 cm.3.This paper analyzed the eddy current loss generated by the AC coil on the impact of the collector defocus,and analyzed the influencing factors of eddy current loss by JMAG electromagnetic field analysis software,which provided a reference for the design of the AC defocusing coils.