X波段低磁场相对论返波管研究

发布时间：2018-06-24 20:34

本文选题：X波段相对论返波管振荡器(RBWO) + 低磁场　；参考：《西南科技大学》2015年硕士论文

【摘要】：在相对论返波管振荡器(Relativistic Backward Wave Oscillator,RBWO)的研究过程中,发现相对论电子束在器件中传输需要磁场对其约束与引导,绝大部分RBWO需要3T以上引导磁场。一般的脉冲螺旋管磁体通常只能工作在单次脉冲状态,制约了RBWO的重复频率工作,为了实现器件的重复频率运行,则需要采用超导磁体来提供引导磁场,或者从器件设计上研制低磁场RBWO,由于超导磁场系统体积庞大对高功率微波源(High Power Microwave,HPM)系统小型化的发展极为不利,因而本文从器件设计上降低RBWO引导磁场,对器件在低磁场条件下工作进行了详细研究。首先,从回旋共振理论分析相对论返波管工作的磁场要求,对RBWO低磁场条件下工作进行了理论研究,分析相对论返波管工作在低磁场条件下的原因以及研究慢波结构的色散特性;考虑零阶空间谐波并从单波假设与微扰假设理论出发推导了相对论返波管振荡器产生的微波功率与引导磁场之间关系。其次,基于永磁磁体的参数,结合高功率微波器件的优点,通过粒子模拟软件Magic完成了X波段低磁场相对论返波管的设计并对其进行了粒子模拟研究。分析慢波结构、二极管电压和电流对返波管振荡器工作特性的影响,优化器件参数,通过对器件结构采用非均匀慢波结构大大提高了束波转换效率。通过PIC粒子模拟能够得到输出微波功率1.11GW,束波转换效率30%。最后,通过脉冲螺线管磁体提供单次脉冲磁场对低磁场相对论返波管进行实验验证,为永磁包装RBWO提供必要的实验数据。在RBWO得到稳定微波输出实验数据基础下,文章通过Magic软件对RBWO在类似永磁磁场分布下进行模拟,并采用永磁磁体来提供磁场对器件进行了实验研究,实验结果与用脉冲磁场得到的基本一致。本文还对器件进行了重复频率20Hz的实验,结果表明,器件能够稳定的工作在重复频率20Hz条件下,该实验结果为器件永磁包装打下了结实的基础,同时也为HPM系统小型化创造了必要的条件。
[Abstract]:In the research of relativistic backward Wave Oscillator (RBWO), it is found that the relativistic electron beam transmission in the device requires a magnetic field to restrain and guide it, and most RBWO require a guiding magnetic field above 3T. Generally, the pulse spiral tube magnets can only work in a single pulse state, which restricts the repetition rate of RBWO. In order to realize the repetitive frequency operation of the device, it is necessary to use superconducting magnets to provide the guiding magnetic field. Or the low magnetic field RBWO is developed from the device design. Because the large volume of superconducting magnetic field system is very disadvantageous to the development of high power microwave source (HPM) system miniaturization, so this paper reduces the RBWO guiding magnetic field in device design. The device is studied in detail under the condition of low magnetic field. Firstly, the theory of cyclotron resonance is used to analyze the magnetic field requirement of the relativistic backwave-return tube, and a theoretical study is carried out on the RBWO working under low magnetic field. The reason of the relativistic backwave tube working under low magnetic field and the dispersion characteristics of the slow-wave structure are analyzed. Considering zero order spatial harmonics and starting from the theory of single wave hypothesis and perturbation hypothesis, the relationship between microwave power and guided magnetic field of relativistic backward-wave tube oscillator is derived. Secondly, based on the parameters of permanent magnet and the advantages of high power microwave devices, the particle simulation software Magic is used to complete the design and study of the X-band relativistic wave return tube with low magnetic field. The effects of slow wave structure, diode voltage and current on the operating characteristics of the backward-wave oscillator are analyzed, and the device parameters are optimized. The beam conversion efficiency is greatly improved by adopting a non-uniform slow-wave structure for the device structure. The output microwave power of 1.11GW and beam conversion efficiency of 30g can be obtained by PIC particle simulation. Finally, the experimental verification of the relativistic backwave-return tube with low magnetic field is carried out by the pulsed solenoid magnet, which provides the necessary experimental data for the permanent magnetic packaging RBWO. On the basis of stable microwave output experimental data obtained from RBWO, this paper simulates RBWO under similar permanent magnetic field distribution by Magic software, and uses permanent magnetic magnet to provide magnetic field to the device. The experimental results are in good agreement with those obtained by pulsed magnetic field. The experimental results show that the device can work stably at the repetition rate of 20Hz, which lays a solid foundation for the permanent magnetic packaging of the device. At the same time, it also creates necessary conditions for miniaturization of HPM system.
【学位授予单位】：西南科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN125

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