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Modeling Methods for the Main Switch of High Pulsed-Power Facilities Based on Transmission Line Code
Based on the transmission line code (TLCODE), a circuit model is developed here for analyses of main switches in the high pulsed-power facilities. With the structure of the ZR main switch as an example, a circuit model topology of the switch is proposed, and in particular, calculation methods of the dynamic inductance and resistance of the switching arc are described. Moreover, a set of closed equations used for calculations of various node voltages are theoretically derived and numericMly discretized. Based on these discrete equations and the Matlab program, a simulation procedure is established for analyses of the ZR main switch. Voltages and currents at different key points are obtained, and comparisons are made with those of a PSpice L-C model. The comparison results show that these two models are perfectly in accord with each other with discrepancy less than 0.1%, which verifies the effectiveness of the TLCODE model to a certain extent. 相似文献
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In order to investigate the injection current uniformity around the induction cell bores,two fully electromagnetic(EM) models are respectively established for a single-stage induction cell and an induction voltage adder(IVA) with three cells stacked in series,without considering electron emission.By means of these two models,some factors affecting the injection current uniformity are simulated and analyzed,such as the impedances of adders and loads,cell locations,and feed timing of parallel driving pulses.Simulation results indicate that higher impedances of adder and loads are slightly beneficial to improve injection current uniformity.As the impedances of adder and loads increase from 5 Ω to 30 Ω,the asymmetric coefficient of feed currents decreases from 10.3%to 6.6%.The current non-uniformity within the first cell is a little worse than that in other downstream cells.Simulation results also show that the feed timing would greatly affect current waveforms,and consequently cause some distortion in pulse fronts of cell output voltages.For a given driving pulse with duration time of 70-80 ns,the feed timing with a time deviation of less than 20 ns is acceptable for the three-cell IVAs,just causing the rise time of output voltages to increase about 5 ns at most and making the peak voltage decrease by 3.5%. 相似文献
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Ultra Fast Shutter Driven by Pulsed High Current 总被引:1,自引:0,他引:1
Radiation simulation utilizing plasma radiation sources (PRS) generates a large number of undesirable debris, which may damage the expensive diagnosing detectors. An ultra fast shutter (UFS) driven by pulsed high current can erect a physical barrier to the slowly moving debris after allowing the passage of X-ray photons. The UFS consists of a pair of thin metal foils twisting the parallel axes in a Nylon cassette, compressed with an outer magnetic field, generated from a fast capacitor bank, discharging into a single turn loop. A typical capacitor bank is of 7.5 μF charging voltages varying from 30 kV to 45 kV, with corresponding currents of approximately 90kA to140 kA and discharging current periods of approximately 13.1 μs. A shutter closing time as fast as 38 microseconds has been obtained with an aluminium foil thickness of 100 micrometers and a cross-sectional area of 15 mm by 20 mm. The design, construction and the expressions of the valve-closing time of the UFS are presented along with the measured results of valve-closing velocities. 相似文献
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使用高速比较器+两级时钟扇出buffer+比较器输出CMOS电平方案,利用ADS的Integrity–IBIS模块,搭建了80台示波器用脉冲信号源。介绍了IBIS模型原理、语法结构及模型适用性,并进行了瞬态仿真,分析了高速比较器IC、时钟扇出IC和脉冲输出IC之间的差分信号完整性,对最终输出信号的延迟和抖动进行了计算。仿真结果表明:使用高速比较器+两级时钟扇出buffer+比较器输出CMOS电平方案可获得80路同步触发信号;输入输出信号延迟<2.6ns,抖动<11ps,50Ω负载时输出信号幅值1.97V,前沿997ps,满足多路示波器外触发信号要求。 相似文献
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As one of the most important elements in linear transformer driver(LTD) based systems, the gas pressurized closing switches are required to operate with a very low prefire probability during the DC-charging process to ensure reliable operation and stable output of the whole pulsed power system. The most direct and effective way to control the prefire probability is to select a suitable working coefficient. The study of the development characteristics of the initially generated electrons is useful for optimizing the working coefficient and improving the prefire characteristic of the switches. In this paper an ultraviolet pulsed laser is used to generate initial electrons inside the gap volume. A current measuring system is used to measure the time-dependent current generated by the growth of the initial electrons so as to study the development characteristics of the electrons under different working coefficients. Experimental results show that the development characteristics of the initial electrons are influenced obviously by the working coefficient. With the increase of the working coefficient, the development degree of the electrons increases consequently. At the same times, there is a threshold of working coefficient which produces the effect of ionization on electrons. The range of the threshold has a slow growth but remains close to 65% with the gas pressure increase. When the working coefficient increases further, γ processes are starting to be generated inside the gap volume. In addition, an optimal working coefficient beneficial for improving the prefire characteristic is indicated and further tested. 相似文献
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Gas pressurized closing switches are one of the most important elements in FLTD-based systems. Improving the trigger performance of gas switches is useful for optimizing the output parameters and the reliability of the FLTD. In this paper, the breakdown characteristics of the trigger gap and the overvoltage gap are studied experimentally. The reasons for the different breakdown performance of the two gaps are also investigated. The results show that the breakdown delay of the trigger gap is more influenced by the trigger voltage, while the breakdown delay of the overvoltage gap is more influenced by the working coefficient and always higher than that of the trigger gap. The jitter of the trigger gap is more influenced by the trigger voltage and accounts more than 60% of the total switch jitter, while the jitter of the overvoltage gap is hardly changed with the trigger voltage as well as the working coefficient and maintains less than 1.4 ns. It is proved that the discharging product from the trigger gap can effectively reduce the breakdown delay and jitter of the overvoltage gap. Based on that, the effect and improvement of pre-ionization on the two gaps are also studied. It is concluded that the jitter of the trigger gap reduces obviously when the pre-ionization is added, while the pre-ionization almost has no effect on the jitter of the overvoltage gap. The jitter of the overvoltage gap is about two times higher than the trigger gap in the pre-ionizing switch. 相似文献
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