【作者】 赵晓云；

【导师】 李家胤；

【作者基本信息】 电子科技大学 ， 物理电子学， 2011， 博士

【摘要】 运动电子在恒定导引磁场与交变电磁场中的回旋谐振是一种十分重要的物理现象,这种现象在自然界中广泛存在,而且也已被人们广泛利用。直到今天,人们仍在不断努力,研发新型的基于回旋谐振机制的电子器件。在已经开发的这类器件中,最广为人知的是回旋管。实际上,还有一些工作机理与回旋管不同的同样基于回旋谐振现象的电子器件也是值得我们关注的。回旋波整流器和潘尼管就是两种基于与回旋管不同机理的特殊回旋波器件,它们不依赖相对论效应,而且所有电子都同时处于加速或减速状态,因此具有很高的注波互作用效率。回旋波整流器是无线输电技术和空间太阳能电站的关键技术之一,可以高效地把微波能变成电能。潘尼管具有在高次回旋谐波高效工作的潜力,有利于发展永磁包装高效率的大中功率毫米波、亚毫米波源,在雷达、通信、电子战、波束武器与新能源研发等多个领域有广泛的应用前景。俄罗斯、美国以及美国、日本都分别对这两种器件有深入的理论与实验研究,但到目前为止,除少数理论研究文章和综述性报道外,国内还没有人从真正意义上深入研究这两种特殊的电真空器件。本论文根椐实验室的安排,以建立实验系统、研制实用器件为最终目标,对这两种器件开展系统的理论研究。本论文采用了等效电路与CST电磁仿真,粒子模拟相结合的快速、实用的设计方法,较好地处理了注波互作用,腔体结构设计,阻抗匹配与互作用系统效率等问题。采用数值计算方法优化了能量转换区的磁场分布,以及降压收集极的电极形状、电势分布。在此基础上系统地设计了一只2.85GHz的回旋波整流器,其器件总效率达83%。首次研究了回旋波整流器的场分布不均匀和空间电荷力对注波互作用的影响,给出了选择电流参数的指导;并分析了板间距、引导磁场、场强以及频率等因素对提高电压的影响,指出,研制厘米波段兆瓦级的回旋波整流器是可能的。利用小信号理论和自洽非线性理论对Ka波段三次回旋谐波潘尼管进行较为深入的研究,分析了电子引导中心漂移以及能量分布规律,提出了通过优化磁场分布提高效率的方法,研究了影响互作用效率的因素,表明在实验可达到的电子注质量下,研制实用的高效高次谐波潘尼管是可行的。为解决目前由cusp电子枪产生的大回旋电子注质量较差,各参数不易调节的现状,提出了采用Cuccia耦合器产生线状大回旋电子注的方法。采用数值计算以及PIC仿真分析了这种新型的大回旋电子注特性,证明了这种新型的电子注源不仅参数易于调节,而且通过优化设计,线状电子注激励的三次谐波潘尼管可获得8kW的输出功率,微波能量转换效率为50%,器件效率为43%,证明了电子注质量完全满足潘尼管的要求,为高次谐波,低磁场潘尼管的实际应用提供了一种有效的解决途径。更多还原

【Abstract】 Moving electrons cyclotron resonance in a constant guiding magnetic field and an alternating electromagnetic field is a very important physical phenomenon, which exists widely in nature, and has been widely used. Until now, people still continue the effort to develop electronic devices of new mechanisms based on cyclotron resonance. In such devices developed, the most well know is the gyrotron. In fact, some other mechanisms different with gyrotron also based on cyclotron resonance phenomenon is well worth our attention.Cyclotron-wave rectifier and peniotron are based on mechanisms which are different from gyrotron. They do not rely on relativistic effects, and all electrons are in the acceleration or deceleration state, so high wave interaction efficiency can easy be obtained. As one of those key technologies in a wireless transmission technology and space solar power station; cyclotron-wave rectifier can efficiently convert microwave energy into DC. Peniotron has high capability of working effectively at high-harmonics, it can be develop to a high and medium power millimeter wave and sub-millimeter wave source packed by permanent magnet, and be widely applied in radar, communications, electronic warfare, beam weapons, and new energy development. Russia, the United States and Japan have deeply research the two devices by method of theoretical and experimental, but up to now, except for a few theoretical research articles and reviews of reports, it has not been truly and deeply studied at home. According to the laboratory plans, taking establishing experimental system and developing practical devices as the ultimate goals, this paper carries out systematic theoretical research of the two devices.A fast and practical design method of cyclotron-wave rectifier design is proposed in this paper, which combines the equivalent circuit, CST electromagnetic simulation and PIC simulation. It can better handle the problems such as beam-wave interaction, cavity design, impedance matching and interaction system efficiency. The magnetic field distribution of conversion region is optimized by using numerical computation, the collector electrode shape, electric potential distribution are designed by using EGUN and CST. On this basis, a 2.85GHz rectifier with a high system efficiency of 84% is design. The wave-bean efficiency influenced by the uneven field distribution and space charge are firstly studied, and the factors affecting voltage such as the plate spacing, guide magnetic field, field strength and frequency are respectively analyzed, the final results point out that it is possible to development MW level cyclotron-wave rectifiers operating at cm band.In this paper, the Ka-band third harmonics peniotron is deeply studied by method of the small signal theory and the self-consistent nonlinear theory, the rules of the electron guiding center drift and the energy distribution are analyzed, a method of improving efficiency by optimizing the magnetic field distribution is proposed, and the factors that affect the interaction efficiency is studied. It indicates that the development of practical and efficient high-harmonic peniotron is feasible under the case of real quality of beam. To solve the problems in a cusp electron gun such as a poor electron quality and difficult adjustment parameters,a novel large-orbit electron beam generated by a Cuccia coupler is proposed. And the properties of such beam are investigated by numerical computation and 3D-PIC simulation, it indicate that the large-orbit beam accelerated by the Cuccia coupler has evident characteristics such as the relative velocity spread low and the high velocity ratio, moreover, other electron beam parameters including transverse velocity, longitudinal velocity and the deviation of guiding center could be adjusted independently, which fully satisfy the special requirements of the high-harmonic peniotron. The simulation results also prove that the Ka-band third-harmonic slotted peniotron can be successfully driven by a 37 kV, 0.5 A, large-orbit electron beam produced by the Cuccia coupler and predicted to achieve an 8kW power output as well as a microwave energy conversion efficiency is 50% and a corresponding device efficiency up to 43%. It proves that such large-orbit beam beam quality meet the requirements of peniotron, and provides an effective solution for practical high-harmonic, low magnetic field peniotron更多还原