无引导磁场电子流的空间电荷波

本文导出了无外磁场电子注在等离子体约束下其上传播的空间电荷波波动方程，详细讨论了该条件下的波特性，并对等离子 频率降低因子进行了分析。研究了离子体填充状况空间电荷波性质影响甚大，选择等离子体填充因子对空间电荷波性质进行适当的控制。     

等离子体圆柱波导慢电磁波的激励

本文在考虑等离子体厚度效应的情况上,详尽地推导了充填圆环状等离子体的圓柱波导中TM模慢电磁波的色散方程;利用相对论空间电荷波理论,导出了相对论电子注在轴向磁场引导下沿等离子体内表面传输时的空间电荷波方程;求得了电子注和慢空间电荷波相互作用的线性增益和频率漂移;讨论了等离子体厚度、密度对色散特性和互作用增益的影响。     

PASOTRON注波互作用线性理论研究

该文研究了等离子体辅助慢波振荡器(Plasma Assisted Slow-wave Oscillator,PA-SOTRON)的物理机制;在考虑离子通道的情况下,利用线性场理论,推导了无引导磁场下等离子体填充的波纹波导中电磁波传播的色散方程;并通过数值计算分析了等离子体填充因子对PASOTRON的时间增长率及工作频率的影响。     

空间电荷波传播特性的PIC粒子模拟

采用周期性边界条件的二维准静电PIC粒子模拟程序对空间电荷波的产生及传播过程进行了数值模拟,给出了静止和一维定向漂移空间电荷波的产生及传播特性随等离子体参数变化的关系,通过单电子跟踪的方法,得到了波动过程带电粒子的空间状态的变化规律。其结果,将作为进一步实现空间电荷波与电磁波产生波一波相互作用过程模拟的基础。     

等离子体中电磁波色散关系的PIC粒子模拟

等离子体参数的变化对在其中传播的电磁波有重要影响,文章采用周期性边界条件的二维PIC粒子模拟程序对电磁波在等离子中的传播过程进行了数值模拟,给出了电磁波在不同密度等离子体中传播的色散关系,得到了电磁波在等离子体中的传播特性。其结果,将作为进一步实现电磁波与等离子体中空间电荷波产生波-波相互作用过程模拟的基础。     

填充比对金属光栅与介质光栅激发表面等离子波的不同影响

采用严格耦合波理论求解了不同填充比的金属光栅与金属平面覆盖介质光栅在角度调制下的共振衰减反射谱,以及它们在表面等离子体共振时的空间场分布,并对结果进行了对比分析。通过数值计算分析了金属表面等离子体波（Surface Plasmon Polariton, SPP）波矢的有效折射率 与光栅填充比的关系,结果表明对于Au金属光栅结构,SPP的 随着光栅填充比增加并无明显变化;而对于金属平面覆盖介质光栅结构,SPP的 随着介质光栅的填充比的增大单调递增。     

基于三波相互作用的等离子体变频技术的粒子模拟

采用等离子体粒子模拟方法,探索无界漂移等离子体中空间电荷波与电磁波所发生的非线性波一波相互作用,对应用这一相互作用过程所产生的散射波的频移特性,寻找产生最大限度频移的散射波物理途径以及实现这一过程对等离子体参数的技术要求。详细讨论等离子体影响散射电磁波频率特性的物理因素及产生隐身的原因。     

填充环形等离子体的介质切伦可夫脉塞

利用线性场理论,对填充环形等离子体的介质切伦可夫脉塞进行了详尽的分析;讨论了薄环形相对论电子注包围环形等离子体、处于环形等离子体之间和位于环形等离子体之内,这三种情况下的注波互作用,分别导出了其色散方程;并对色散方程直接进行了数值求解;求得了系统的截止频率、工作频率和波增长率,讨论了有关参数对它们的影响。     

一种新型的强流相对论等离子回旋管

本文介绍了一种新型的强流相对论器件——强流相对论等离子回旋管。叙述了在强流相对论性器件中填充等离子体实现空间电荷补偿的原理,及苏联科学院普通物理所在3cm波段获得的实验结果。     

等离子体加载波纹波导的色散方程

本文在考虑离子通道及电子束注入后等离子体电子重新分布条件下,导得了填充等离子体波纹波导的注波互作用色散方程,并给出了不同条件下的具体表达式。研究表明,结果与不考虑离子通道相比有较大差异。     

磁自聚焦电子注的空间轨迹及传输特性

本文给出了充等离子体微波管漂移区电子运动的空间轨迹方程，根据电子运动特性沿径向将空间划分为三个区域，利用数值方法分别求解非相对论和相对论条件下的空间轨迹，并详细阐述了注的传输特性。讨论了影响电子注传输质量的因素。     

On the Focussing and Transmission Properties of Electron Beam in High Power Microwave Sources Filled with Plasma

Based on the electron movement principles the beam paraxial trajectory and space trajectory equation in drifting space filled with plasma are given in this paper. The space is divided into two areas(α and β, β contains β₁ and β₂), the behavior of electrons in these areas is studied. The equations are theoretically or numerically solved, the focussing and transmission properties are studied and some parameters affecting these properties are discussed in detail. The relativistic effect is also taken into account. The study shows that with plasma filled the beam can be focused efficiently and transmitted with high quality by optimally choosing the plasma filling fraction and the voltage. Plasma microwave electronics stemmed from 1949, however, it developed rapidly in recent years. In the process of high power microwave study, plasma is more and more introduced into microwave source. Because of the neutralization effect of plasma, the beam can transmit with high quality, even under weak or without magnetic field, it can propagate through drifting tube or slow wave structure by its self magnetic focusing force^[1–2]. By making full use of this property, microwave devices without magnetic field system can be made, this leads to a decrease in volume and weight of the device. Some experiments show that this kind of device can promote the output power and efficiency obviously. However, because of the presence of plasma, the beam's behavior changes greatly compared to those under vacuum condition. It is important to study the properties of the beam in drifting space or slow wave structure filled with plasma for the development of the device.     

Theory of the Amplitron

The Amplitron device is analyzed from a normal mode viewpoint based on predominance of the reentrant character of the stream; the analysis is therefore valid for devices with short electron recirculation times and moderate signal levels. The nature of the space charge deduced from the above hypothesis is that of a rotating set of identical spokes having equal angular spacing in the interaction space. The induction effects of this space charge configuration upon the delay line are calculated, accounting for the periodic nature and the short length of the delay line. It is found that both forward-and backward-traveling waves are appreciable and must be considered. The fields in the interaction space are resolved into Fourier component traveling waves. The amplitude of the synchronously interacting wave is related to 1) the input signal, 2) the forward-traveling wave resulting from space charge induction, and 3) the backward-traveling wave resulting from space charge induction. Use is made of the phase relation (adiabatic theory) between the space charge and the synchronously traveling wave to obtain a consistent solution determining the phase relation between the input wave and the space charge. The above relationship between the space charge and the input signal allows the calculation of complex (vector) gain of the Amplitron. It is thus shown that the Amplitron is a nonlinear, or saturated, amplifier. A limit to the gain is observed; the backward-traveling wave is essential in determining it. Phase-dependence on operating RF level, or RF phase pushing, is noted; this type of phase variation does not exceed 90°. Calculations as a function of frequency show the bandwidth to be expected. It is found that conditions may lead to oscillation; feedback mechanisms reside in the backward-traveling wave and in the stream reentrance. The degree of input mismatch of the operating tube is discussed.     

A Non-Invasive Technique for Detecting Stress Waves in Bone Using the Piezoelectric Effect

A stress wave propagating in a long bone is accompanied by a traveling electrical charge generated as a result of the piezoelectric character of bone. An electromagnetic device has been developed which can detect the magnetic fields associated with this charge and which is capable of monitoring stress waves in bone in vivo. The field measurement is independent of the mechanical properties of the soft tissue overlying the bone, so that difficulties previously encountered with vibration and wave propagation tests to determine in vivo properties of bone are avoided. Applications to the diagnosis of bone disorders are discussed.     

速调管双间隙输出段的效率计算

本文在计算速调管双间隙输出段的效率时,不沿用传统的花费时间的电子圆盘时间积分法和过于简单化的空间电荷波法,而提出了一种新的综合性的计算方法。使用这种方法其所需计算时间比电子圆盘法要少得多;计算结果与热测结果基本吻合。