共查询到19条相似文献,搜索用时 125 毫秒
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68GHz ECRH系统由6套0.5MW/1s(1.5s)子系统构成,140GHz ECRH系统由2套1MW/3s子系统构成。每套子系统由独立的传输线与天线相连,再通过天线注入等离子体。68GHz ECRH子系统为非真空传输线,以内径为80mm的过模波纹圆波导为主要传输部件,包括隔直器、弹性波导、换向波导和一个槽纹深度为l/2的极化器;140GHz ECRH子系统为真空传输线,以内径为63.5mm的过模波纹圆波导为主要传输部件,包括隔直器、弹性波导、换向波导、转换开关、抽气波导和槽纹深度分别为l/4与l/8的极化器。经过不断地完善,68GHz ECRH系统传输线已成功运用于ECRH运行中,整条传输线的输送效率可以达到90%左右。对于140GHz ECRH系统,已完成了传输部件的整体设计,目前正在进行相关部件加工测试。 相似文献
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通过K-Na离子交换技术制备了多模玻璃平面波导.采用棱镜耦合技术测量了波导的有效折射率,用IWKB方法拟合得到K-Na离子交换波导的折射率分布符合高斯分布,由色散曲线得到单模波导的制备条件(即扩散深度范围),从而得出单模波导的离子交换时间范围,制备出单模波导,并通过求解WKB色散方程得出单模波导的表面折射率.用普通数码相机,通过对离子交换平面玻璃光波导传输线进行数字成像,根据传输线上的光强分布拟合出光强传输衰减曲线,计算出单模波导的传输损耗大约为0.4 dB/cm. 相似文献
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根据 HL-2M 装置物理实验加热的需求,完成了总功率为 8MW 的电子回旋共振加热及电流驱动
(ECRH/ECCD)系统设计,开展了波源、传输及天线等关键部件研制。8MW ECRH/ECCD 系统,由 8 套 105GHz/
1MW/3s 波源系统、8 条内径为 63.5mm 的真空传输线及三套极向实时可控的发射天线构成。目前,已完成
ECRH/ECCD 系统关键部件研制及其相关的桌面与高功率性能测试。测试结果表明,微波源回旋管输出微波功率
达到1MW/3s,在真空度为 10‒2Pa 的过模波纹圆波导传输线中能低耗稳定传输,发射天线极向全量程角度转动响
应时间在 50ms 以内。 相似文献
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用横向等效网络方法分析了非线性平板波导中TM的色散关系和场分布.这种方法基于传输线理论,把非线性介质波导中复杂的电磁场问题等效于电路网络问题,用横向谐振技术得到色散方程.用数值方法计算了不同非线性机制下三层平板非线性波导中的TM波传输特性. 相似文献
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在高功率微波(HPM)脉冲压缩系统中,储能谐振腔能否实现最大储能效率,微波输入耦合窗的正确设计是非常重要的。谐振腔与波导管之间采用的是耦合孔,当假定腔体是无耗时,则其等效传输线电路如图1所示。jX^-L与jtanβd的并联构成了耦合孔平面处总的归一化输入阻抗为Z^m=jX^-L tanβd/(X^-L tanβd)希望空腔谐振在谐振时与波导匹配, 相似文献
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利用CST微波工作室软件对新一代Z箍缩驱动装置中变阻抗传输线部分进行了三维电磁场仿真,建立了同轴型指数线模型,在外导体内半径保持100mm不变、输入端特性阻抗0.203Ω、输出端特性阻抗2.16Ω、输入角频率14×106 rad/s的半正弦脉冲TEM波的情况下,发现传输过程中会产生少量非TEM模,线的尺寸变化越剧烈,产生的非TEM模能量越多。在传输线足够长的情况下,电磁场仿真得到的电压传输效率与电路仿真结果相差不到1%,因此可以用电路仿真结果代替电磁场仿真。 相似文献
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A novel 35GHz 3dB power divider using coupled transmission line is presented. Unlike conventional Wilkinson divider circuit, only the 50 transmission lines are used in the design. The impedance matching can be achieved by coupled transmission line even mode characteristic impedance. The predicated and measured performances agree well. 相似文献
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Eric Tala-Tebue Aurelien Kenfack-Jiotsa Marius Herv Tatchou-Ntemfack Timol on Cr pin Kofan 《理论物理通讯》2013,60(1):93-100
In this work, we investigate the dynamics of modulated waves non-identical coupled nonlinear transmission lines. Traditional methods for avoiding mode mixing in identical coupled nonlinear electrical lines consist of adding the same number of linear inductors in each branch. Adding linear inductors in a single line leads to asymmetric coupled nonlinear electrical transmission lines which propagate the signal and the mode mixing. On one hand, the difference between the two lines induced the fission for only one mode of propagation. This fission is influenced by the amplitude of the signal and the amount of the input energy as well; it also narrows the width of the input pulse soliton, leading to a possible increasing of the bit rate. On the other hand, the dissymmetry of the two lines converts the network into a good amplifier for the ω_ mode which corresponds to the regime admitting low frequencies. 相似文献
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Sepideh Ebrahimi Reza Sabbaghi-Nadooshan Mohammad Bagher Tavakoli 《Optical and Quantum Electronics》2018,50(8):324
Optical gates based on switchable material have become a focus of investigation. The present study designs an optical gate that uses DNA transmission lines and developed for Feynman and Toffoli reversible gates. It is shown that the implementation of a transmission line such as Ag/DNA/Ag produces a structure with high-quality switching. The switching characteristics of DNA were considered when designing the basic transmission line. The “On” mode is assumed for DNA with low conductivity. As conductivity increases, the line switches to the “Off” mode. A conceptual design is proposed in the present study for Feynman and Toffoli reversible gates for an optical regime at 300 THz based on DNA switching. A conceptual model is developed with an Ag/DNA/Ag transmission line controlled by changing the DNA bias. This transmission line provides a “Yes” gate, which is necessary for a reversible gate. The full wave time domain method was used to model the optical gates. The current work discusses how a DNA memristor can be used to design a compact reversible gate having a simple structure and high switching quality for use in optical systems. 相似文献
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Wolfgang Hartig Herbert Walther 《Applied Physics A: Materials Science & Processing》1973,1(3):171-174
The hyperfine splittings of the Na D1 and D2 lines were investigated using a single mode cw dye laser. The light of the laser was scattered by the atoms of an atomic
beam and the fluorescent light was observed as the frequency of the laser was tuned across the D lines. The Doppler width
of the atomic beam was reduced to about 2.5 MHz so that the absorption width of the atoms of the beam was essentially determined
by the natural width of the 32P1/2 and 32P3/2 levels, which is about 10 MHz. Since the linewidth observed for the hyperfine transitions was 30 MHz, most of the hyperfine
components of the D1 and D2 lines could be resolved. In another experiment the frequency of the dye laser was locked to a hyperfine transition of the
D1 line. The observed variation of the output frequency of the dye laser was less than ±1.5 MHz. In addition, the intensity
of the dye laser was controlled to about 10−3, using an electro-optically variable transmission filter. 相似文献
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Combination of magnetically-resonant dielectric resonators and TE cut-off waveguide structures provides unbalanced or balanced
composite right/left handed transmission lines. This idea has been expanded into 1-D, 2-D, and 3-D composite structures, and
can be applied to potential microwave and millimeter wave circuits and antennas in the same manner as conventional composite
right/left handed transmission lines. 相似文献
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Recently,the single metal wire(SW) has become attractive for its potential applications in the terahertz and higher frequency range.However,as the most simple and typical surface plasmon polariton(SPP) transmission line,its study seems far from enough.Many important transmission behaviours have not been explained satisfactorily from the viewpoint of physics.In this paper,making use of the modified Drude model(MDM) based on the Sommerfeld theory,the transmission behaviours of SPPs along SW are systemically investigated theoretically.Some important physical phenomena such as the mode transformation,the lifetime of the radiative mode and the resonance frequency are revealed,and their mechanisms are explored.The results obtained in the paper will facilitate a general understanding of the features and the physical essence of the SPP transmission,not only for SW itself but also for other SPP transmission lines. 相似文献