【摘要】：這里的行波器件主要是指行波管和返波管。隨著微波技術(shù)的快速發(fā)展,對微波器件的要求也越來越高。各研究機(jī)構(gòu)都向小體積、高頻率、大功率、低成本方向研究開發(fā)微波器件。而帶狀注微波器件恰好有這樣的性能,因此帶狀注器件近年來受到眾多研究機(jī)構(gòu)的關(guān)注。帶狀注器件之所以受到廣大研究者的青睞,主要因?yàn)閹铍娮幼⑵骷葓A柱形電子注器件擁有更多的優(yōu)點(diǎn):(1)帶狀電子注可以在不改變輸入電流密度的前提下,可以加大電子注橫截面的橫向長度來增加輸入電流,從而輸入輸出功率得到提高。(2)帶狀注微波器件窄邊尺寸較小,滿足高頻率電磁波對器件尺寸要小的要求——共渡性。(3)帶狀電子注更靠近慢波結(jié)構(gòu)的內(nèi)表面,這有利于電子注和高頻結(jié)構(gòu)之間相互作用。(4)帶狀電子注器件更易于實(shí)際加工及測試。帶狀電子注器件還擁有其它很多優(yōu)勢,但目前帶狀電子注還存在一些問題需要解決及優(yōu)化。例如帶狀電子注橫截面上空間電荷場水平和垂直方向不一致,因此聚焦很困難。本文將結(jié)合電子注的受力情況以及Mathieu方程穩(wěn)定解約束條件來設(shè)計(jì)140GHz帶狀注行波管的聚焦系統(tǒng),以及220GHz帶狀注返波管的聚焦系統(tǒng)。本文行波管和返波管聚焦都采用永磁周期磁場進(jìn)行聚焦。140GHz帶狀注行波管的聚焦通過Wiggler系統(tǒng)進(jìn)行聚焦。借鑒周期永磁聚焦系統(tǒng)的分析方法,分析Wiggler磁場的磁場分布,結(jié)合Mathieu方程穩(wěn)定解得出電子注穩(wěn)定傳輸?shù)募s束條件。利用MATLAB繪出Wiggler聚焦系統(tǒng)約束條件的二維圖,根據(jù)約束條件利用仿真軟件CST進(jìn)行建模仿真,依據(jù)仿真結(jié)果分析Wiggler聚焦方式對Diocotron的抑制效果,以及分析Wiggler聚焦存在橫向擺動(dòng)和橫向擴(kuò)散的不足。220GHz帶狀注返波管的聚焦系統(tǒng)采用周期凹凸聚焦磁場PCM(the periodic cusped magnetic)聚焦方法。將分析PCM聚焦系統(tǒng)的磁場分布,結(jié)合電子穩(wěn)定傳輸?shù)臈l件,設(shè)計(jì)返波管的PCM聚焦系統(tǒng),通過仿真軟件CST建模仿真優(yōu)化,分析得到的仿真結(jié)果。PCM聚焦與Wiggler聚焦有相同問題:電子注傳輸過程中存在橫向發(fā)散,電子注輸出時(shí)比輸入時(shí)橫向?qū)掃叧叽绱?倍左右。為了解決電子注橫向發(fā)散問題,利用半無限磁塊的理論建立帶偏移的PCM聚焦系統(tǒng)offset_PCM。在offset_PCM聚焦系統(tǒng)的作用下CST的仿真結(jié)果顯示帶狀電子注傳輸穩(wěn)定,不會(huì)出現(xiàn)電子注橫向擴(kuò)散和Diocotron現(xiàn)象,并且電子流通率達(dá)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%.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN12

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本文編號(hào)：2224984