【摘要】：與傳統(tǒng)的虛陰極振蕩器相比,同軸虛陰極振蕩器振蕩器具有更高的束波轉(zhuǎn)換效率、頻率穩(wěn)定和長脈沖工作能力等優(yōu)點(diǎn),成為了一種具有良好應(yīng)用前景的高功率微波發(fā)生器,但其效率低下的缺點(diǎn)仍然是限制其發(fā)展的最大障礙。旨在推動其實(shí)用化目標(biāo)的實(shí)現(xiàn),本文將從理論和數(shù)值模擬上開展束流調(diào)制機(jī)制對該類型器件效率影響的研究,為調(diào)制增強(qiáng)型同軸虛陰極振蕩器的設(shè)計(jì)提供基礎(chǔ)。本文基于一維穩(wěn)態(tài)的假設(shè)初步建立了同軸虛陰極振蕩器的簡化物理模型,獲得了電子束與互作用腔內(nèi)振蕩電場之間的非線性諧振增益,并對非線性諧振過程進(jìn)行了深入的討論�；谠撐锢砟Ｐ头治隽耸黝A(yù)調(diào)制機(jī)制對虛陰極振蕩器效率的影響,并利用數(shù)值模擬方法對其相關(guān)物理規(guī)律進(jìn)行驗(yàn)證,其分析結(jié)果指出調(diào)制增強(qiáng)是提高該器件微波產(chǎn)生效率最有效的措施之一�；趶�(qiáng)流電子束在同軸諧振腔中調(diào)制過程的分析,建立了調(diào)制腔中TEM模式與電子束相互作用的一維模型,分析了調(diào)制電場強(qiáng)度、調(diào)制腔數(shù)量及其間隙寬度對束流調(diào)制效果的影響,從中獲得了引入多腔調(diào)制腔結(jié)構(gòu)和增強(qiáng)調(diào)制腔內(nèi)電場強(qiáng)度的兩種調(diào)制增強(qiáng)手段。為驗(yàn)證理論結(jié)果的有效性,先后提出了三腔與調(diào)制型同軸虛陰極振蕩器和雙腔調(diào)制增強(qiáng)型同軸虛陰極振蕩器的兩種模型。通過數(shù)值模擬優(yōu)化設(shè)計(jì),前者獲得了輸出功率約為7.20 GW,效率約20%的高功率微波輸出,后者得到了輸出功率約為7.05GW,效率約為19.6%的純凈的輸出結(jié)果。該數(shù)值模擬結(jié)構(gòu)進(jìn)一步表明,束流預(yù)調(diào)制對于提高虛陰極振蕩器效率具有重要作用。
[Abstract]:Compared with the traditional virtual cathode oscillator, the coaxial virtual cathode oscillator has the advantages of higher beam conversion efficiency, stable frequency and long pulse working ability, so it has become a high power microwave generator with good application prospects. But the disadvantage of its inefficiency is still the biggest obstacle to its development. In order to promote the realization of the practical target, the effect of beam modulation mechanism on the efficiency of this type of device is studied theoretically and numerically in this paper, which provides a basis for the design of modulation-enhanced coaxial virtual cathode oscillator (VCO). Based on the assumption of one-dimensional steady-state, a simplified physical model of coaxial virtual cathode oscillator is established in this paper. The nonlinear resonant gain between electron beam and interaction intracavity oscillating electric field is obtained, and the nonlinear resonance process is discussed in depth. Based on this physical model, the effect of beam premodulation mechanism on the efficiency of virtual cathode oscillator is analyzed, and the relevant physical laws are verified by numerical simulation. The results show that modulation enhancement is one of the most effective measures to improve the microwave generation efficiency of the device. Based on the analysis of the modulation process of a high current electron beam in a coaxial resonator, a one-dimensional model of the interaction between the TEM mode and the electron beam in the modulation cavity is established, and the intensity of the modulated electric field is analyzed. The effect of the number of modulation cavities and the gap width on the beam modulation effect is discussed. Two modulation enhancement methods are obtained, which are the introduction of multi-cavity structure and the enhancement of the electric field intensity in the modulation cavity. In order to verify the validity of the theoretical results, two models of three-cavity and modulated coaxial virtual cathode oscillator and two cavity modulated enhanced coaxial virtual cathode oscillator are proposed. Through the numerical simulation and optimization design, the former got the high power microwave output of about 7.20 GW, efficiency about 20%, the latter got the pure output result of the output power about 7.05 GW and the efficiency about 19.6%. The numerical simulation structure further shows that beam premodulation plays an important role in improving the efficiency of virtual cathode oscillator.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN752

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