The Research Of The Sheet Beam Electro-optical Systems

In the spectrum, Terahertz wave (referred Thz wave) is from0.1~10THz ofelectromagnetic radiation, and located between millimeter wave and infrared. Due to thespecial position, the Terahertz Science and Technology applied in very many areas.Therefore, many countries pay attention on the research of the Terahertz Science andTechnology so that it acquired unprecedented development.There are many problems in terahertz applications. One of these problems is notstable output and high-power source, and the electric vacuum device backward waveoscillator has the possibility to solve this problem. The core component of terahertzsource is the electron-optical system. Because of frequency achieve the terahertz band,the wavelength became shorter and shorter. The traditional cylindrical slow-wavestructure are difficult to process because the size is too small, so they need a new kindof electro-optical system to solve this problem, and the sheet beam electro-opticalsystems can solve this problem, it is compared with conventional electro-optical systemhas the following advantages. First, one direction of the sheet beam electro-optical canmatch the wavelength of the smaller-scale, the other direction to select a larger size, soit can transmit a large current under a smaller space charge force, and improve he outputpower. Second, the sheet electron beam is close high-frequency structure t in thetransmission process, so it can made a better interaction with the high-frequencystructure, which can enhance the efficiency in the use of microwave tube. Third, thesheet beam have a very small transverse dimension, so it suitable for the electron sourceof a high-frequency band electrical vacuum device.This article is from the electronic theory and Pierce electron gun theories tounderstand the basic knowledge of the electron gun, and made a study of the basictheory of the sheet electron beam gun. At the same time, we made research of the shapeof the sheet electron and the edge electron trajectory equations through the movement ofthe sheet beam.According to the requirement, used the particle simulation software to simulate thesheet beam gun, and made a study of the some factors influence on the electron gun’s performance parameters, such as the electron gun focusing electrode shape and structuresize,cathode shapes, and the axial magnetic field location.Because of the transmissionof the sheet beam is not stable, we made a study of effective inhibition of thedeformation and distortion of the electron beam focusing magnetic field—wigglermagnetic field, and simulate the magnetic field according to the required magnetic fieldsize requirements.Finally, joined in the experiment of the electric vacuum, and understood thespecific steps of the assembly as well as experimental processing of the sheet electronoptical system. Made a test of the package good circulation tube, and provide the testingmethod, the test program. At last, use the theoretical study, the combination ofnumerical and experimental to analyze the experimental results.