毫米波波段带状注行波器件聚焦系统研究
发布时间：2018-09-05 17:40
【摘要】：这里的行波器件主要是指行波管和返波管。随着微波技术的快速发展,对微波器件的要求也越来越高。各研究机构都向小体积、高频率、大功率、低成本方向研究开发微波器件。而带状注微波器件恰好有这样的性能,因此带状注器件近年来受到众多研究机构的关注。带状注器件之所以受到广大研究者的青睐,主要因为带状电子注器件比圆柱形电子注器件拥有更多的优点:(1)带状电子注可以在不改变输入电流密度的前提下,可以加大电子注横截面的横向长度来增加输入电流,从而输入输出功率得到提高。(2)带状注微波器件窄边尺寸较小,满足高频率电磁波对器件尺寸要小的要求——共渡性。(3)带状电子注更靠近慢波结构的内表面,这有利于电子注和高频结构之间相互作用。(4)带状电子注器件更易于实际加工及测试。带状电子注器件还拥有其它很多优势,但目前带状电子注还存在一些问题需要解决及优化。例如带状电子注横截面上空间电荷场水平和垂直方向不一致,因此聚焦很困难。本文将结合电子注的受力情况以及Mathieu方程稳定解约束条件来设计140GHz带状注行波管的聚焦系统,以及220GHz带状注返波管的聚焦系统。本文行波管和返波管聚焦都采用永磁周期磁场进行聚焦。140GHz带状注行波管的聚焦通过Wiggler系统进行聚焦。借鉴周期永磁聚焦系统的分析方法,分析Wiggler磁场的磁场分布,结合Mathieu方程稳定解得出电子注稳定传输的约束条件。利用MATLAB绘出Wiggler聚焦系统约束条件的二维图,根据约束条件利用仿真软件CST进行建模仿真,依据仿真结果分析Wiggler聚焦方式对Diocotron的抑制效果,以及分析Wiggler聚焦存在横向摆动和横向扩散的不足。220GHz带状注返波管的聚焦系统采用周期凹凸聚焦磁场PCM(the periodic cusped magnetic)聚焦方法。将分析PCM聚焦系统的磁场分布,结合电子稳定传输的条件,设计返波管的PCM聚焦系统,通过仿真软件CST建模仿真优化,分析得到的仿真结果。PCM聚焦与Wiggler聚焦有相同问题:电子注传输过程中存在横向发散,电子注输出时比输入时横向宽边尺寸大3倍左右。为了解决电子注横向发散问题,利用半无限磁块的理论建立带偏移的PCM聚焦系统offset_PCM。在offset_PCM聚焦系统的作用下CST的仿真结果显示带状电子注传输稳定,不会出现电子注横向扩散和Diocotron现象,并且电子流通率达到百分之百。
[Abstract]:The traveling wave device here mainly refers to the traveling wave tube and the back wave tube. With the rapid development of microwave technology, the requirement of microwave devices is becoming higher and higher. All research institutes develop microwave devices in the direction of small volume, high frequency, high power and low cost. And the band beam microwave device has this kind of performance, so the band beam device has been paid attention to by many research institutions in recent years. The reason why the banded electron beam device is favored by many researchers is that the band electron beam device has more advantages than the cylindrical electron beam device: (1) the band electron beam can not change the input current density. The transverse length of the cross section of the electron beam can be increased to increase the input current, thus the input and output power can be increased. (2) the narrow edge size of the band beam microwave device is smaller, To meet the requirements of the high frequency electromagnetic wave to the device size is small-common. (3) the band electron beam is closer to the inner surface of the slow-wave structure. This is beneficial to the interaction between the electron beam and the high frequency structure. (4) the strip electron beam device is easier to be processed and tested in practice. There are many other advantages in banded electron beam devices, but there are still some problems to be solved and optimized. For example, the horizontal and vertical direction of the space charge field on the cross section of the band electron beam is not consistent, so it is difficult to focus. In this paper, the focusing system of 140GHz band beam-traveling-wave tube and the focusing system of 220GHz banded beam-back wave tube are designed in combination with the force of electron beam and the constraint condition of Mathieu equation stability solution. In this paper, both the traveling wave tube and the back wave tube are focused by the permanent magnet periodic magnetic field. The focusing of the 140GHz band beam traveling wave tube is carried out through the Wiggler system. Based on the analysis method of periodic permanent magnet focusing system, the magnetic field distribution of Wiggler magnetic field is analyzed, and the constraint condition of stable transmission of electron beam is obtained by combining with the stable solution of Mathieu equation. The constraint condition of Wiggler focusing system is drawn by MATLAB. According to the constraint condition, the simulation software CST is used to model and simulate. According to the simulation results, the restraining effect of Wiggler focusing mode to Diocotron is analyzed. The limitation of transverse swing and transverse diffusion in Wiggler focusing is analyzed. The focusing system of 220 GHz band beam-back wave tube is focused by PCM (the periodic cusped magnetic) focusing method with periodic concave and convex focusing magnetic field. The magnetic field distribution of the PCM focusing system is analyzed and the PCM focusing system of the backwave tube is designed in combination with the condition of stable electron transmission. The simulation software CST is used to model and optimize the system. The simulation results are as follows. PCM focusing has the same problem as Wiggler focusing: there is lateral divergence in electron beam transmission, and the size of transverse wide edge of electron beam output is about 3 times larger than that of input beam. In order to solve the lateral divergence problem of electron beam, a PCM focusing system offset_PCM. with offset is established by using the theory of semi-infinite magnetic block. Under the action of offset_PCM focusing system, the simulation results of CST show that the band electron beam transmission is stable, there is no transverse diffusion of electron beam and Diocotron phenomenon, and the electron circulation rate reaches 100%.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN12
本文编号：2224984
[Abstract]:The traveling wave device here mainly refers to the traveling wave tube and the back wave tube. With the rapid development of microwave technology, the requirement of microwave devices is becoming higher and higher. All research institutes develop microwave devices in the direction of small volume, high frequency, high power and low cost. And the band beam microwave device has this kind of performance, so the band beam device has been paid attention to by many research institutions in recent years. The reason why the banded electron beam device is favored by many researchers is that the band electron beam device has more advantages than the cylindrical electron beam device: (1) the band electron beam can not change the input current density. The transverse length of the cross section of the electron beam can be increased to increase the input current, thus the input and output power can be increased. (2) the narrow edge size of the band beam microwave device is smaller, To meet the requirements of the high frequency electromagnetic wave to the device size is small-common. (3) the band electron beam is closer to the inner surface of the slow-wave structure. This is beneficial to the interaction between the electron beam and the high frequency structure. (4) the strip electron beam device is easier to be processed and tested in practice. There are many other advantages in banded electron beam devices, but there are still some problems to be solved and optimized. For example, the horizontal and vertical direction of the space charge field on the cross section of the band electron beam is not consistent, so it is difficult to focus. In this paper, the focusing system of 140GHz band beam-traveling-wave tube and the focusing system of 220GHz banded beam-back wave tube are designed in combination with the force of electron beam and the constraint condition of Mathieu equation stability solution. In this paper, both the traveling wave tube and the back wave tube are focused by the permanent magnet periodic magnetic field. The focusing of the 140GHz band beam traveling wave tube is carried out through the Wiggler system. Based on the analysis method of periodic permanent magnet focusing system, the magnetic field distribution of Wiggler magnetic field is analyzed, and the constraint condition of stable transmission of electron beam is obtained by combining with the stable solution of Mathieu equation. The constraint condition of Wiggler focusing system is drawn by MATLAB. According to the constraint condition, the simulation software CST is used to model and simulate. According to the simulation results, the restraining effect of Wiggler focusing mode to Diocotron is analyzed. The limitation of transverse swing and transverse diffusion in Wiggler focusing is analyzed. The focusing system of 220 GHz band beam-back wave tube is focused by PCM (the periodic cusped magnetic) focusing method with periodic concave and convex focusing magnetic field. The magnetic field distribution of the PCM focusing system is analyzed and the PCM focusing system of the backwave tube is designed in combination with the condition of stable electron transmission. The simulation software CST is used to model and optimize the system. The simulation results are as follows. PCM focusing has the same problem as Wiggler focusing: there is lateral divergence in electron beam transmission, and the size of transverse wide edge of electron beam output is about 3 times larger than that of input beam. In order to solve the lateral divergence problem of electron beam, a PCM focusing system offset_PCM. with offset is established by using the theory of semi-infinite magnetic block. Under the action of offset_PCM focusing system, the simulation results of CST show that the band electron beam transmission is stable, there is no transverse diffusion of electron beam and Diocotron phenomenon, and the electron circulation rate reaches 100%.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN12
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