Research And Application Of THz BWO On Single Grating Structure

Terahertz(THz)waves are electromagnetic waves with frequencies ranging from0.1THz to 10THz(wavelengths ranging from 0.03 mm to 3mm).THz technology is a very important interdisciplinary frontier field,and its applications are very wide,such as THz time domain spectroscopy technology,THz imaging technology,safety inspection and biomedicine,etc.In recent years,THz science and technology has developed rapidly with the development of its generation mechanism,technical detection and application technology.In THz science and technology,the THz source is the foundation of all scientific research and application,vacuum electronics is one of the important method of generation of THz radiation source,and backward wave tube is a classification of the vacuum electronics,which makes use of the backward wave on the slow wave structure and electronic note interact and produce microwave oscillation,With the development of micromachining technology and on-chip electronic injection technology,the BWO has more outstanding performance in miniaturization and high power.The high frequency system of the tube is the main part of the tube.The study of the high frequency system of the tube is the key to the study of the corresponding tube.In this paper,a THz BWO with single grating structure based on on-chip electron injection is studied.This paper mainly studies the single grating structure THz BWO based on the on-chip electron gun.The main work is as follows.Firstly,the interaction of injection wave is analyzed theoretically,and the development of BWO at home and abroad is investigated.Then MATLAB is used to calculate the cycle length and groove depth of the BWO at 0.5THz and 1THz under 5k V and 1k V respectively.Under the condition of applying the current density of 100A/cm2,a peak power output of 2.5m W and 2.3m W is obtained respectively.Then further use MAGIC to affect the starting vibration,output power and output frequency of some parameters that are difficult to use theory to calculate the simulation verification,such as the number of cycles,electronic channel height,electronic channel output position,electronic injection current density and electronic injection thickness.Analyze the simulation results and discuss their rules,paving the way for the next step of simulation design.As the frequency rises,the loss caused by the skin effect on the surface of the rough structure cannot be ignored.In this paper,the skin depth of the three materials is calculated,and Python is used for modeling.At the same time,the surface roughness was modeled by square wave period.According to the surface roughness of the micromachining method obtained from the investigation,the theoretical calculation was carried out.The ratio of the actual loss to the ideal smooth surface loss was obtained under different surface roughness tables of 0.5THz and 1THz.This paper will also make a preliminary preparation for the experiment,investigate the current development of micromachining technology and on-chip electronic injection,and carry out a preliminary planning experiment according to the software and hardware equipment available at present.