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Investigation Of A Novel Inductive Energy Storage Pulsed Power Source And Its Application Of Driving An S-band Tapered MILO

Posted on:2010-05-23Degree:DoctorType:Dissertation
Country:ChinaCandidate:Z Q LiFull Text:PDF
GTID:1118360278456557Subject:Electronic Science and Technology
Abstract/Summary:PDF Full Text Request
The applications of high power microwave require that the pulsed power technology and high power microwave source technology develop towards the direction of miniaturization and long pulse. As one of important candidates in their respective fields, an inductive energy storage pulsed power source and a magnetically insulated transmission line oscillator (MILO) have attracted the attention of many researchers. In this dissertation, based on the theoretical analysis and simulation calculation of the working mechanism and operation properties of the novel inductive energy storage pulsed power source, an experimental inductive energy storage pulsed power souce has been designed and fabricated, at the same time, a MILO which can be used as a matching load of the pulsed power source has also been studied. Experiments of using this pulsed power source to drive the MILO have also been carried out.This dissertation mainly consists of the following aspects.1) Based on the systematic study of the traditional inductive energy storage pulsed power source, the theoretical analysis and simulation study of the working mechanism and operation properties of the novel inductive energy storage pulsed power source have been carried out. The basic thought of the novel technology is that by the help of the delay time of the transmission line, the beginning times of the different inductors discharge can be isolated, so that the output waveform can be improved. Considering the transmission line as a capacitor, the novel principle circuit has been simplified and the discharging formula of the inductor has been derived. The formula shows that the novel technology changes the traditional pure exponentially decayed discharging waveform into a combination of an exponentially decayed discharging waveform and a sinusoidally damped oscillation discharging waveform, which is the very reason why the waveform is improved. Further numerical calculation indicates that the novel technology also has the advantages of decreasing the output impedance and increasing the energy transfer efficiency. Additionally, when the RLL2C2 circuit quality factor Q≈1 is satisfied, the maximum energy transfer efficiency can be obtained. Circuit simulation results are in agreement with the theoretical results.2) Based on the theoretical and simulation study, the theory of the new design has been proved by the principle experiments. Through the survey, choice, structure design and static electrical field ananlysis for the key parts, an experimental device has been designed and fabricated. Measurements of the circuit parameters and experiments of the water resistance dumy load by the pulsed power source have also been carried out. Experiments with the dumy load have validated the simulation results. 3) Based on the investigation, comparison and analysis, an S-band tapered MILO with an impedance of 15Ωhas been designed and studied experimentally. Through the dispersion curve of the MILO, preliminary structure parameters were designed. With the help of the PIC code and the electromagnetic analysis software, the optimized structure parameters have been obtained. Micorwave with an averaged power of 2GW, a frequency of 2.65GHz and an efficiency of 11% has been achieved under the diode voltage of 500kV and the current of 35kA in the improved structure.The study of the MILO under the long pulse operation shows that the poor diode voltage waveform results in the poor microwave waveform. The effect study of different load structures on the output feature indicates that the graphite load is a better choice for long pulse operation.4) The diode driven by the experimental device has been studied experimentally. Operation properties of this device have been obtained through the experimental study of its driving different diode loads such as the virtual cathode oscillator (VCO), the MILO with the impedance of 15Ωand another MILO with the impedance of 20Ω. The study of the relation between the diode current and the ratio of the electrically exploded wires number and the charging voltage shows that there exists the optimal value of n/Uc which can make the pulsed source get the maximum current output. The study of adjusting gas pressure in the chopping switch shows that reasonablely controlling the gas pressure is the promise for the better output waveform. The study of changing the energy storage inductive value (L2) shows that the output waveform is easy to be changed by adjusting the inductive value. The pulse shortening is caused by the diode breakdown and the surface flashover of the electrically exploded opening switch through the study of pulse shortening phenomena. In the experimental study of this device's driving the S-band MILO with the impedance of 15Ωto generate high power microwave, an output with an averaged power of 200MW and the pulse width of 66ns has been obtained under the diode voltage of 300kV,the current of 22kA and the pulse width of 214ns.5) Based on the theoretical analysis and experimental study, a concept about the compact structure design has been presented and the preliminary integrated design has been carried out. Through the especial structure design and the static electric field analysis of the key parts, a structure model of the pulsed power source with the length of less than 1m and the width of less than 0.65m has been obtained, which can be worked safely under the diode voltage of 500kV and the current of 34kA. Additionally, a concept design of a full solid state source has also been presented and simulated.
Keywords/Search Tags:inductive energy storage, magnetically insulated transmission line oscillator (MILO), pulsed power technology, high power microwave technology
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