共查询到20条相似文献,搜索用时 15 毫秒
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An X-band magnetically insulated transmission line oscillator (MILO) is designed and investigated numerically and experimentally for the first time. The X-band MILO is optimized in detail with KARAT code. In simulation, the X-band MILO, driven by a 720 kV, 53 kA electron beam, comes to a nonlinear steady state in 4.0 ns. High-power microwaves (HPM) of TEM mode is generated with an average power of 4.1 GW, a frequency of 9.3 GHz, and power conversion efficiency of 10.870 in durations of 0-40 ns. The device is fabricated according to the simulation results. In experiments, when the voltage is 400 kV and the current is 50 kA, the radiated microwave power reaches about 110 MW and the dominating frequency is 9.7GHz. Because the surfaces of the cathode end and the beam dump are destroyed, the diode voltage cannot increase continuously. However, when the diode voltage is 400 kV, the average power output is obtained to be 700 MW in simulation. The impedance of the device is clearly smaller than the simulation prediction. Moreover, the duration of the microwave pulse is obviously shorter than that of the current pulse. The experimental results are greatly different from the simulation predictions. The preliminary analyses show that the generations of the anode plasma, the cathode flare and the anode flare are the essential cause for the remarkable deviation of the experimental results from the simulation predictions. 相似文献
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根据磁绝缘线振荡器(magnetically insulated transmission line oscillator, MILO)中基模(TM00模)与临近高阶模(HEM11模)高频场分布的区别,采用破坏各腔之间HEM11模π 模谐振条件的方式抑制器件中高阶模产生的方法,提出了高阶模抑制型MILO. 运用三维全电磁粒子模拟软件对高阶模抑制型L波段MILO器件进行模拟研究, 数值模拟结果表面该方法能够抑制器件中HEM11模的产生.在此基础上对器件进行了对比性实验研究, 实验结果表明高阶模抑制型器件能够抑制HEM11模的产生,稳定工作在基模. 相似文献
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建立并分析了传输线脉冲变压器的基本电路模型,采用优化次级线电感参数的方法,有效地提高了次级线的阻抗,达到了抑制次级线对输出结果影响的目的。在此基础上,分析并讨论了2种典型的传输线脉冲变压器拓扑结构,在一般情况下,推导了二者输出脉冲电压幅值的计算公式,优化了各次级线电感大小的设计。结果表明,级间无耦合结构从第二级开始电感逐级增加,第n级次级线上电感的最优大小为第二级的(n-1)倍;级间有耦合结构中同一磁芯引起的各次级线电感大小应相同。最后,比较了各类结构的输出,指出级间有耦合结构所需磁芯量最少。 相似文献
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建立并分析了传输线脉冲变压器的基本电路模型,采用优化次级线电感参数的方法,有效地提高了次级线的阻抗,达到了抑制次级线对输出结果影响的目的。在此基础上,分析并讨论了2种典型的传输线脉冲变压器拓扑结构,在一般情况下,推导了二者输出脉冲电压幅值的计算公式,优化了各次级线电感大小的设计。结果表明,级间无耦合结构从第二级开始电感逐级增加,第n级次级线上电感的最优大小为第二级的(n-1)倍;级间有耦合结构中同一磁芯引起的各次级线电感大小应相同。最后,比较了各类结构的输出,指出级间有耦合结构所需磁芯量最少。 相似文献
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The phenomenon of energy unidirectional transmission is numerically investigated by using a system of two coupled discrete nonlinear electrical transmission lines, each line of the network contains a finite number of cells and has different pass band structures, respectively. Using numerical simulations, we examine the frequency multiplication of the driving frequency and the lattice filtering effect in the line. These lead to the generation of energy unidirectional transmission. In the present work, energy is carried by the second harmonic wave in the pass band. In addition, we also study the dependence of the energy efficiency on the driving amplitude and other parameters of the model, such as the system size and the nonlinear coefficient, by calculation. Furthermore, after detailed numerical simulation, an experimental demonstration is realized. The experimental results agree with those in simulation qualitatively. 相似文献
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A. I. Fedosov 《Russian Physics Journal》1979,22(11):1246-1247
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V. V. Tyutekin 《Acoustical Physics》2000,46(6):710-715
The properties of an acoustic system called by the author ”a multichannel transmission line” (MTL) are considered. Analytical expressions are derived for the following main acoustical characteristics of an MTL consisting of an arbitrary number N of single lines: the input impedance, the resonance frequencies, the reflection and transmission factors for an MTL-insulator, and the reflection factor for an MTL-absorber. For these quantities, numerical calculations are performed, and their frequency dependences are presented for different parameters of the constituent lines in the cases N=2 and 3. It is shown that the acoustical characteristics of MTL-insulators and MTL-absorbers have considerable advantages over the characteristics of similar systems designed on the basis of single lines. 相似文献
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L. Fu H. Schweizer H. Guo N. Liu H. Giessen 《Applied physics. B, Lasers and optics》2007,86(3):425-429
We use simple transmission line models with lumped elements of inductance and capacitance to interpret optical transmission
and reflection spectra of cut wires and cut-wire pairs in the near infrared region. The numerical values of the elements are
obtained by fitting experimental or numerical simulated reflectance and transmittance spectra. The scattering parameters and
the retrieved effective material parameters calculated from the transmission line models show good agreements with those obtained
from experiments or numerical simulations. This indicates that transmission line theory is a powerful tool for designing and
analyzing metamaterials at optical frequencies.
PACS 41.20.Jb; 78.67.-n; 78.66.Sg 相似文献
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Zhang Le Zou Wenkang Wang Xueqiong Xie Weiping Liu Dagang Chen Lin Wang Meng Wei Bing 《强激光与粒子束》2012,24(4)
对长距离磁绝缘传输线(MITL)的传输效率和结构变化带来的影响进行了评估.介绍了MITL稳态流与非稳态流理论,为了验证各种条件对传输效率的影响进行了粒子模拟,修改了MITL的结构并设计了若干对应的分解检验实验.通过准确测量同一位置的阴阳极电流和电压验证了Mendel层流理论公式.已完成的电感支撑阴阳极实验结果表明,使用合适量级电感型刚性弹簧对内外筒进行固定可以满足传输效率设计要求. 相似文献
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In this paper we analyze the stochastic-resonant behavior of a chain of forward-coupled bistable overdamped oscillators used as a transmission line with possible applications to neurophysiology, information transmission and storage. We drive the line with a random sequence of non-return-to-zero bits and each oscillator is independently perturbed by noise. The line is analyzed for varying coupling strengths that lead to different regimes, ranging from noise-supported to coupling-supported transmission. We characterize the transmission performance by parameters such as output bit error rate and delivered signal-to-noise ratio, and show them to improve and remain flat for a broad range of noise intensities in all coupling regimes. In particular, we found that this system exhibits an enhanced robustness as compared to a linear transmission channel impaired only by additive noise. 相似文献
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Journal of Applied Spectroscopy - 相似文献