波在周期磁化等离子体中传播特性的研究

【作者】 陈永东；

【导师】 鄢扬；

【作者基本信息】 电子科技大学 ， 等离子体物理， 2006， 硕士

【摘要】 高功率微波装置中的电流密度很大,空间电荷效应强烈,影响了功率的提高,克服空间电荷效应的有效方法是在高功率微波器件中填充等离子体,由于等离子体对空间电荷的中和作用,传输电流会大大提高,从而大幅度提高输出功率,同时由于等离子体中存在多种波动模式,有可能带来新的注波互作用机制,发展新型的高功率微波器件。研究表明,等离子体加载微波管能使器件的性能大幅度改善,极大的增加带宽,效率和功率。而电磁波与等离子体之间存在极为丰富的相互作用现象,对电磁波的传播构成重大影响。本文的目的是探索一种周期磁化等离子体慢波结构,并做了如下的工作:1.对电磁波在密度周期变化磁化等离子体中的传输特性进行了研究,通过数值计算分析了不同外加磁场以及不同等离子体密度情况下波的传播特性。2.对电磁波在周期磁化均匀等离子体中的传播特性进行了研究,通过数值计算分析了不同外加磁场幅值,背景磁场以及不同等离子体密度对波传播特性的影响.3.研究了电磁波在填充密度周期变化等离子体金属圆波导中的传输特性,通过数值计算分些了不同等离子体密度和背景密度情况下对波的传播特性的影响.4.研究了电磁波在填充周期磁化均匀等离子体金属圆波导中的传输特性,推导出该周期慢波结构的色散方程,通过数值计算,绘出了色散曲线图.更多还原

【Abstract】 Due to the density of electrical current is very high in high power microwave apparatus, space charge effect is very strong, they limit the increasing of out-power. One of effective ways of overcoming space charge effect is to fill plasma in high power wave apparatus, by the neutralization between plasma and space charge, the transfer current is going to be largely enhanced, thereby out- power is going to be largely increased. Meantime, due to there are many fluctuating modes in plasma, so it is able to bring a new beam-wave interaction mechanism, by it people can invent some new type high power microwave apparatus. A lot of results show that high power microwave apparatus filled plasma is able to largely enhance the capability and to increase bandwidth, efficiency and power of apparatus.The aim of this paper is to search for a new type periodic slow-wave structure with filling periodically magnetized plasma, and following works are done:1. Firstly, the investigation of wave propagation characteristic in magnetized plasma with periodically changing density is done. By numerical calculation, analyze the effect of additional magnetic field and plasma density changing on the propagation characteristic.2. Second, the investigation of wave propagation characteristic in periodically magnetized uniformity plasma is done, in light of numerical calculation, to analyze the effect of additional magnetic field amplitude, background magnetic field and plasma density changing on the propagation characteristic.3. More, the investigation of wave propagation characteristic in round waveguide filled periodically changeful plasma in density is done, by numerical calculation, to analyze the effect on the propagation characteristic when background plasma density and the amplitude of plasma density change.4. Finally, the investigation of wave propagation characteristic in round waveguide filled uniformity plasma periodically magnetized is done, by numerical calculation, to analyze the effect on the propagation characteristic when additional magnetic field amplitude, background magnetic field and plasma density change.更多还原