19-23 June 2011
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[Title page]
Publication Year: 2011, Page(s):i - xvii|
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Welcome
Publication Year: 2011, Page(s):1 - 2|
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Table of contents
Publication Year: 2011, Page(s):1 - 25|
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Fast pulser for high-altitude ignition research
Publication Year: 2011, Page(s):131 - 134A jet engine can flame out at high altitude because the igniter cannot couple enough energy into the low-pressure air-fuel mixture. To reignite the engine, the aircraft must descend to a lower altitude where the air pressure is higher. Under a recent U.S. Air Force SBIR grant, Diversified Technologies, Inc. designed and built a fast ignition pulser. The pulser was delivered to the Air Force Resear... View full abstract»
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1 MJ pulsed current source
Publication Year: 2011, Page(s):135 - 139
Cited by: Papers (1)The pulsed current source is intended for research of high-current electrical discharges in dense media in laboratory conditions. The facility includes two modules of capacitive energy storage, control panel unit and cable collector which connects facility with the load. Each module is a functionally completed remote-operated capacitive energy storage 0.5 MJ, 18 kV, built on eight capacitor cells ... View full abstract»
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Fast rise time pulsed power generator using IGBTs and coaxial magnetic pulse compression circuit
Publication Year: 2011, Page(s):140 - 145All solid-state pulsed power generators, which are operated with long lifetime, compactness and high reliability, have been developed to be used for industrial applications, such as excimer laser, high energy density plasma (EUV sources) and pulse ozonizer. Moreover, requirements of these applications are repetitive operation and fast risetime voltage. Recently, semiconductor power device technolo... View full abstract»
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Miniature pulsed power generator using amagnetic pulse compression circuit
Publication Year: 2011, Page(s):146 - 150This paper reports on miniaturization of a pulsed power generator (PPG) with a magnetic pulse compression circuit (MPC). In the point of view of volume and performance of the miniature PPG, discrete ceramic capacitors are used and the core materials of Fe-based nanocrystalline with a high magnetic flux swing and Co-based amorphous with a high permeability are compared. Losses of components are sen... View full abstract»
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Design and optimization techniques for the generation of intense, ultrafast pulses with nonlinear transmission lines
Publication Year: 2011, Page(s):151 - 155Solid-state systems that produce kW or MW pulses on nanosecond timescales typically consist of multiple stages composed of nonlinear components that compress and switch energy. The transient and nonlinear nature of these stages complicate the analysis of system dynamics to an extent that closed form expressions describing metrics such as output impedance, energy compression ratio, and efficiency i... View full abstract»
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Parametric amplification and frequency up-conversion of high power RF pulses in nonlinear transmission lines
Publication Year: 2011, Page(s):156 - 161
Cited by: Papers (1)This publication proposes a new concept for high power RF/microwave pulse generation, up-conversion and amplification using nonlinear transmission lines with ferrites (or nonlinear dielectrics) that promote interaction of a high power RF wave with a co-propagating electromagnetic shock wave. This approach enables a multi-stage system in which frequency up-conversion and amplification occurs on eac... View full abstract»
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PSpice simulations of nonlinear transmission lines based on ferroelectric dielectrics
Publication Year: 2011, Page(s):162 - 166The search for efficient, compact, high-power conversion of electrical impulses into high power microwave energy is driving a modern rebirth of nonlinear transmission line studies. A nonlinear transmission line utilizes the nonlinear permittivities and permeabilities, εr and μr for dielectrics and magnetics, respectively, to transform a fast-rising pulse front i... View full abstract»
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Pulsed, high power, RF generation from nonlinear dielectric ladder networks - Performance limits
Publication Year: 2011, Page(s):167 - 172
Cited by: Papers (8)An extensive study of the generation of bursts of soliton-like pulse trains on nonlinear dielectric/ capacitance ladder networks has shown that there are some fundamental physical problems that limit this method of generating high power, pulsed RF signals. The purpose of this paper is to review these issues and suggest areas where research may lead to significant performance improvements. High pow... View full abstract»
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Characterization of a synchronous wave nonlinear transmission line
Publication Year: 2011, Page(s):173 - 177
Cited by: Papers (1)Many aspects of Non Linear Transmission Lines (NLTL's) make them attractive sources for High Power Microwave (HPM) systems. This paper describes a test bed that is being used to investigate synchronous wave NLTL operations. Analytical models and numerical simulations are used in design of the line and interpretation of results. Shock wave propagation is characterized and compared to theoretical pr... View full abstract»
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A novel solid-state HPM source based on a gyromagnetic NLTL and SOS-based pulse generator
Publication Year: 2011, Page(s):178 - 181
Cited by: Papers (7)High power RF pulses at a frequency of up to 1 GHz have been produced using a fully solid state system that consists of a gyromagnetic NLTL and a solid state pulse forming circuit. The novel sgyromagnetic NLTL and a solid state pulse forming circuit. The novel solid state SOS diode-based driver produces sub-10ns pulses of the order of 100 kV. The pulse generator is capable of running at pulse repe... View full abstract»
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Temperature dependence of ferrimagnetic based nonlinear transmission line
Publication Year: 2011, Page(s):182 - 184
Cited by: Papers (2)Ferrite loaded nonlinear transmission lines (NLTLs) are able to act as high power microwave sources, utilizing the nonlinearities present in ferrimagnetic materials and the excitation of damped gyromagnetic precession at high incident power levels. Ferrimagnetic properties depend greatly on operating temperatures; therefore, there exists a need to know the ideal temperature at which to operate fer... View full abstract»
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Circuit modeling of nonlinear lumped element transmission lines
Publication Year: 2011, Page(s):185 - 192
Cited by: Papers (7)A nonlinear lumped element transmission line (NLETL) that consists of an LC-ladder network can be used to convert a rectangular input pump pulse to a series of RF oscillations at the output. The discreteness of the LC-sections in the network contributes to the line dispersion while the nonlinearity of the LC-elements produces the nonlinear characteristics of the line. Both of these properties comb... View full abstract»
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Experimental demonstration of nonlinear lumped element transmission lines using COTS components
Publication Year: 2011, Page(s):193 - 198
Cited by: Papers (8)In recent years, there has been great interest in using nonlinear lumped element transmission lines (NLETLs) to generate RF pulses. The NLETL consists of an LC-ladder network where either the capacitive element or the inductive element is nonlinear. There has been the suggestion of using a hybrid line where both the elements are nonlinear. This paper focuses on the implementation of a low-voltage ... View full abstract»
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Advanced imaging of pulsed atmospheric surface flashover
Publication Year: 2011, Page(s):199 - 202
Cited by: Papers (1)Vacuum Ultraviolet (VUV) radiation is commonly thought to enhance streamer formation, as it is energetic enough to cause photoionization in the gaseous volume. Light with wavelengths below 180 nm, i.e. VUV, is highly absorbed in the atmosphere which increases the difficulty of measuring any VUV emission from gaseous breakdown at atmospheric pressure. Nevertheless, VUV emission from pulsed surface ... View full abstract»
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A Finite-Difference time-domain simulation of formative delay times of plasma at high RF electric fields in gases
Publication Year: 2011, Page(s):203 - 206A Finite Difference (FD) algorithm was developed to calculate the formative delay time between the application of an RF field to a dielectric surface and the formation of a field-induced plasma interrupting the RF power flow. The analysis is focused on the surface being exposed to a background gas pressure above 50 torr. The FD-algorithm is chosen over particle-in-cell methods due to its higher co... View full abstract»
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Nanosecond-scale spectroscopy of vacuum ultraviolet emission from pulsed atmospheric discharges
Publication Year: 2011, Page(s):207 - 211
Cited by: Papers (1)This paper describes a 2nd-generation system for directly studying the emission of vacuum ultraviolet (VUV) light from pulsed dielectric surface flashover at atmospheric pressure. The role of self-produced VUV emission (i.e. energies greater than 7 eV) on photo-ionization processes during the early nanoseconds of pulsed discharges is virtually unexplored, and yet could be a significant factor in t... View full abstract»
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High dielectric constant composites for high power antennas
Publication Year: 2011, Page(s):212 - 217
Cited by: Papers (10)The volume and weight of high power antennas can be a limiting factor for compact pulsed power transmitters. Options for antenna minimization are limited due to the relationship between an antenna's physical dimensions and the frequencies which can be transmitted. Thus, low frequency antennas often require dimensions on the order of meters. An effort undertaken at the University of Missouri addres... View full abstract»
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Weibull statistical analysis of impulse-driven surface breakdown data
Publication Year: 2011, Page(s):218 - 222Surface breakdown of oil-immersed solids chosen to insulate high-voltage, pulsed-power systems is a problem that can lead to catastrophic failure. Statistical analysis of the breakdown voltages associated with such liquid-solid interfaces can reveal useful information to aid system designers in the selection of solid materials. Described in this paper are the results of a Weibull statistical analy... View full abstract»
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Dielectric surface effects on transient ARCS in lightning arrester devices
Publication Year: 2011, Page(s):223 - 225Continuum calculations are used to understand the avalanche growth of electrical current in a composite insulator consisting of an air gap and a solid dielectric. The results show that trapped charge can quench the electrical breakdown. The results are compared with phenomena found in dielectric barrier discharge (DBD) devices. View full abstract»
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Effect of electrode surface roughness on the breakdown jitter of a nanoparticle-infused dielectric oil spark gap switch
Publication Year: 2011, Page(s):226 - 230Electrode surface roughness is generated over the lifetime of an oil spark gap by high-temperature arc discharges during normal circuit operation. These electrode pits and spikes create macroscopic electric field enhancements allowing electrons to initiate breakdown at lower switch voltages. Nanoparticles with a high dielectric constant are thought to polarize and interact with these enhancements ... View full abstract»
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Pulsed pre-breakdown phenomena in high pressurized carbon dioxide including supercritical state
Publication Year: 2011, Page(s):231 - 234Pulsed streamers in highly pressurized carbon dioxide up to and including the supercritical state were observed by means of Schlieren method. The fluid temperature was set to T = 305 K; pressures, to P = 7.5 and 8.0 MPa. The gap was needle-to-plane; the gap lengths in positive and negative were d = 7 and 1 mm, respectively. Pulse voltages of positive/negative polarity generated by a magnetic pulse... View full abstract»
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Design of compact feed-through for 500 kV high voltage cable
Publication Year: 2011, Page(s):235 - 238This paper presents the design and electrical simulations of a high voltage feed-through working at 500 kV into atmospheric pressure or primary vacuum. Operational needs and technical considerations have been taken into account to design this component. The high pulsed voltage (500 kV - 50 ns), the limited size (maximum diameter: 100 mm), the possibility to work into a primary vacuum (10-2 View full abstract»