【摘要】：回旋行波管是一種相對(duì)論非線性真空電子器件,其在微波毫米波以及太赫茲波段有不可替代的優(yōu)勢(shì)。其結(jié)構(gòu)簡(jiǎn)單、輸出功率高、增益高、工作頻率高、帶寬寬等優(yōu)點(diǎn)使得其很適合應(yīng)用于雷達(dá)、通信、電子對(duì)抗、等離子體加熱等高頻高能領(lǐng)域。回旋行波管的高頻結(jié)構(gòu)是回旋行波管的核心部件之一,它是電子注與高頻電磁波發(fā)生互作用的主要場(chǎng)所,也是實(shí)現(xiàn)電子注與電磁波能量轉(zhuǎn)換的主要場(chǎng)所。然而,由于其采用橫向互作用機(jī)理,高頻結(jié)構(gòu)中很容易發(fā)生競(jìng)爭(zhēng)模式振蕩,限制回旋行波管的性能。因此,許多科研人員致力于回旋行波管多模振蕩的研究,從理論和實(shí)踐上發(fā)展出多種方法來(lái)抑制回旋行波管的多模振蕩,提高回旋行波管的工作性能。其中在高頻結(jié)構(gòu)中采用介質(zhì)加載是一種使用廣泛、成熟有效的方法。本文對(duì)回旋行波管的多模振蕩的理論和種類(lèi)進(jìn)行討論,通過(guò)對(duì)圓波導(dǎo)多模疊加的場(chǎng)方程和回旋電子運(yùn)動(dòng)方程聯(lián)立推導(dǎo),得到回旋行波管多�；プ饔梅匠探M。同時(shí)分析回旋行波管中多種自激振蕩的原理和影響因素,考慮抑制方法。并且開(kāi)發(fā)適用于回旋行波管的蟻群分裂算法,通過(guò)數(shù)值優(yōu)化算法對(duì)回旋行波管的高頻結(jié)構(gòu)進(jìn)行仿真優(yōu)化,設(shè)計(jì)出一種W波段的分布式介質(zhì)回旋行波管高頻結(jié)構(gòu),其輸出功率達(dá)到136.63kW,效率達(dá)到28.46%,飽和增益達(dá)到51.36dB,帶寬達(dá)到7GHz。本文的主要研究工作有:1.在回旋行波管自洽非線性理論中考慮多模效應(yīng),分析多�；プ饔玫碾姶挪ǚ植己碗娮幼⑦\(yùn)動(dòng)方程,對(duì)其進(jìn)行聯(lián)立推導(dǎo),得到多�；プ饔梅匠探M。2.對(duì)回旋行波管中自激振蕩的種類(lèi)進(jìn)行討論,分析其產(chǎn)生機(jī)理、影響因素和介質(zhì)加載方法對(duì)其的抑制。并定性地分析端口反射帶來(lái)的反射振蕩。3.針對(duì)回旋行波管的實(shí)際問(wèn)題在蟻群算法的基礎(chǔ)上發(fā)展出蟻群分裂算法,編寫(xiě)優(yōu)化算法程序,對(duì)回旋行波管高頻結(jié)構(gòu)進(jìn)行優(yōu)化設(shè)計(jì)。4.通過(guò)Particl-in-cell(PIC)粒子模擬得到一性能良好的W波段介質(zhì)加載回旋管高頻結(jié)構(gòu)的仿真結(jié)果,并對(duì)仿真結(jié)果進(jìn)行分析。
[Abstract]:Cyclotron is a kind of relativistic nonlinear vacuum electronic device which has irreplaceable advantages in microwave millimeter wave and terahertz wave band. Because of its simple structure, high output power, high gain, high operating frequency and wide bandwidth, it is suitable for high frequency and high energy fields such as radar, communication, electronic countermeasure, plasma heating and so on. The high frequency structure of the gyrotron is one of the core components of the gyrotron. It is the main place where the electron beam interacts with the high frequency electromagnetic wave, and also the main place to realize the energy conversion between the electron beam and the electromagnetic wave. However, due to the transverse interaction mechanism, the competitive mode oscillation is easy to occur in the high frequency structure, which limits the performance of the gyrotron. Therefore, many researchers devote themselves to the study of the gyrotron multimode oscillation, and develop many methods to suppress the gyrotron multimode oscillation and improve the performance of the gyrotron. The application of dielectric loading in high frequency structure is a widely used, mature and effective method. In this paper, the theory and types of multimode oscillations in gyrotron traveling wave tube are discussed. The equations of multimode interaction of cyclotron traveling wave tube are derived by simultaneous derivation of field equation and cyclotron motion equation of multimode superposition of circular waveguide. At the same time, the principle and influence factors of various self-excited oscillations in gyrotron TWT are analyzed, and the suppression method is considered. An ant colony splitting algorithm suitable for gyrotron is developed. The high frequency structure of gyrotron TWT is simulated and optimized by numerical optimization algorithm, and a W-band distributed medium gyrotron TWT high frequency structure is designed. The output power is 136.63kW, the efficiency is 28.46kW, the saturation gain is 51.36dB, the bandwidth is 7GHz. The main research work of this paper is: 1. Considering the multimode effect in the self-consistent nonlinear theory of gyrotron traveling wave tube, the electromagnetic wave distribution and the equation of electron beam motion of the multimode interaction are analyzed, and the equations of multimode interaction. The types of self-excited oscillations in gyrotron traveling wave tube are discussed. The mechanism of the oscillation is analyzed. The influence factors and the method of medium loading to suppress the oscillation are analyzed. The reflection oscillation caused by port reflection is analyzed qualitatively. Aiming at the practical problem of gyrotron, an ant colony splitting algorithm is developed based on ant colony algorithm, and an optimization algorithm program is written to optimize the high frequency structure of gyrotron. 4. The simulation results of a W-band dielectric loaded gyrotron high frequency structure with good performance are obtained by Particl-in-cell (PIC) particle simulation, and the simulation results are analyzed.
【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(lèi)號(hào)】：TN124

【參考文獻(xiàn)】

相關(guān)期刊論文 前8條

1 彭澍源;王秋實(shí);張兆傳;羅積潤(rùn);;回旋行波管多模穩(wěn)態(tài)理論及初步應(yīng)用[J];物理學(xué)報(bào);2014年20期

2 彭凱;劉大剛;楊長(zhǎng)鴻;劉臘群;夏蒙重;;改進(jìn)的三維電磁PIC系統(tǒng)模擬并行算法[J];強(qiáng)激光與粒子束;2013年03期

3 袁學(xué)松;鄢揚(yáng);傅文杰;劉，

本文編號(hào)：2221281