调制增强型同轴虚阴极振荡器理论分析与数值模拟
发布时间：2018-10-29 18:41
【摘要】：与传统的虚阴极振荡器相比,同轴虚阴极振荡器振荡器具有更高的束波转换效率、频率稳定和长脉冲工作能力等优点,成为了一种具有良好应用前景的高功率微波发生器,但其效率低下的缺点仍然是限制其发展的最大障碍。旨在推动其实用化目标的实现,本文将从理论和数值模拟上开展束流调制机制对该类型器件效率影响的研究,为调制增强型同轴虚阴极振荡器的设计提供基础。本文基于一维稳态的假设初步建立了同轴虚阴极振荡器的简化物理模型,获得了电子束与互作用腔内振荡电场之间的非线性谐振增益,并对非线性谐振过程进行了深入的讨论。基于该物理模型分析了束流预调制机制对虚阴极振荡器效率的影响,并利用数值模拟方法对其相关物理规律进行验证,其分析结果指出调制增强是提高该器件微波产生效率最有效的措施之一。基于强流电子束在同轴谐振腔中调制过程的分析,建立了调制腔中TEM模式与电子束相互作用的一维模型,分析了调制电场强度、调制腔数量及其间隙宽度对束流调制效果的影响,从中获得了引入多腔调制腔结构和增强调制腔内电场强度的两种调制增强手段。为验证理论结果的有效性,先后提出了三腔与调制型同轴虚阴极振荡器和双腔调制增强型同轴虚阴极振荡器的两种模型。通过数值模拟优化设计,前者获得了输出功率约为7.20 GW,效率约20%的高功率微波输出,后者得到了输出功率约为7.05GW,效率约为19.6%的纯净的输出结果。该数值模拟结构进一步表明,束流预调制对于提高虚阴极振荡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.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN752
本文编号：2298490
[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.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN752
【参考文献】
相关期刊论文 前7条
1 林竞羽,侯德亭;高功率微波技术发展概述[J];航天电子对抗;2003年04期
2 谢文楷,朱雄伟,刘盛纲;虚阴极时间相关行为的单荷电层分析[J];强激光与粒子束;1992年03期
3 杨温渊,丁武;一种高效率和高功率的双同轴虚阴极振荡器[J];强激光与粒子束;2003年11期
4 杨占峰,邵浩,刘国治,宋志敏,陈昌华;向内发射同轴虚阴极振荡器实验研究[J];强激光与粒子束;2003年12期
5 丁武,郝建红;虚阴极振荡器中微波产生的解析理论[J];强激光与粒子束;2004年09期
6 罗雄;廖成;孟凡宝;张运俭;于爱民;王晓东;范植开;张新凯;;同轴虚阴极振荡器实验研究[J];强激光与粒子束;2006年02期
7 张永鹏;张余川;宋志敏;;束流预调制型同轴虚阴极振荡器的初步理论分析[J];强激光与粒子束;2009年04期
相关博士学位论文 前1条
1 贾云峰;径向渡越时间振荡器的研究[D];中国人民解放军国防科学技术大学;2002年
，本文编号：2298490
本文链接：https://www.wllwen.com/kejilunwen/dianzigongchenglunwen/2298490.html
