{"title":"An Electromagnetic Topology and Transmission Line Matrix Hybrid Technique for Modeling High Power Electromagnetic Interactions","authors":"P. Kirawanich, D. Gleason, N. Islam","doi":"10.1109/PPC.2005.300676","DOIUrl":"https://doi.org/10.1109/PPC.2005.300676","url":null,"abstract":"A combination of electromagnetic topology (EMT) and a transmission line matrix methodology to simulate an external electromagnetic pulse's interactions with cable network following penetration through apertures is presented. The results show improvements over previous simulations using EMT technique only. An array of the topological network has been created by the integration of the sub-network matrices based on the transmission line matrix (TLM) network. The simulation results for field penetration using this technique confirm the new combination approach and give good results when compared with an FDTD method. The transmission line-electromagnetic topology approach is simpler, less time consuming and for large systems is likely to save on mesh generation, simulation time without sacrificing on results. Analysis of the field propagation and penetration also shows the effects of the aperture size on the temporal characteristics and frequency spectral components of the incident Gaussian pulse.","PeriodicalId":200159,"journal":{"name":"2005 IEEE Pulsed Power Conference","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123536812","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Bipolar High Voltage Pulse Power Generator","authors":"P. Lukeš, V. Babický, M. Člupek, P. Šunka","doi":"10.1109/PPC.2005.300485","DOIUrl":"https://doi.org/10.1109/PPC.2005.300485","url":null,"abstract":"Bipolar high voltage pulse power generator is a device that generates alternately positive and negative pulses of the same amplitude and waveform. It consists of a variable high voltage DC source, a rotating spark gap and a low inductance capacitor. The spark gap allows switching both the charging and discharging phases of the capacitor into the load. The time delay between positive and negative pulses is one half of the repetition period, which is controlled by revolutions of the rotating spark gap. The amplitude of output voltage pulses can be varied up to 35 kV with the repetition frequency up to 100 Hz. Shape of output pulse is determined by used capacitor and the load value. For typical parameters (capacitor 14 nF, average load value ~100 Omega) pulses with exponential slope, rise time 40 ns and pulse duration ~3 mus are generated. The potential applications of such system include in particular generation of the pulse electrical discharges in the liquid phase. This paper describes design and performance of the bipolar high voltage pulse power generator. The high voltage measurements of the generator output pulsed into resistive load are presented and compared with the results of circuit simulations.","PeriodicalId":200159,"journal":{"name":"2005 IEEE Pulsed Power Conference","volume":"105 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123689941","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. Savage, T. Pointon, D. Seidel, C. Mendel, T. Wagoner, D. H. Romero, P. Wakeland
{"title":"Passive Mitigation of Load Debris in a Magnetically Insulated Transmission Line","authors":"M. Savage, T. Pointon, D. Seidel, C. Mendel, T. Wagoner, D. H. Romero, P. Wakeland","doi":"10.1109/PPC.2005.300659","DOIUrl":"https://doi.org/10.1109/PPC.2005.300659","url":null,"abstract":"The Z driver at Sandia National Laboratories delivers one to two megajoules of electromagnetic energy inside its ~10 cm radius final feed in 100 ns. The high current (~20 MA) at small diameter produces magnetic pressures well above yield strengths for metals. The metal conductors stay in place due to inertia long enough to deliver current to the load. Within milliseconds however, fragments of metal escape the load region at high velocity. Much of the hardware and diagnostics inside the vacuum chamber is protected from this debris by blast shields with small view ports, and fast-closing valves. The water-vacuum insulator requires different protection because the transmission line debris shield should not significantly raise the inductance or perturb the self- magnetically insulated electron flow. This report shows calculations and results from a design intended to protect the insulator assembly.","PeriodicalId":200159,"journal":{"name":"2005 IEEE Pulsed Power Conference","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121974160","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Stretch Meat Grinder: A Novel Circuit Topology for Reducing Opening Switch Voltage Stress","authors":"A. Sitzman, D. Surls, J. Mallick","doi":"10.1109/PPC.2005.300703","DOIUrl":"https://doi.org/10.1109/PPC.2005.300703","url":null,"abstract":"The slow transfer of energy through capacitive hybrid (STRETCH) meat grinder is an inductive- capacitive current multiplication circuit that reduces switching requirements and achieves a high degree of current multiplication while possessing an energy density approaching that of a purely inductive system. Initially, the STRETCH meat grinder operates like a single-stage meat grinder; it increases the current through an inductor by switching out a coupled inductor. However, during switching in generic meat grinder circuits, leakage flux caused by imperfect coupling and the sudden change in current induces a voltage across the opening switch well beyond what modern solid-state switches can handle. The STRETCH meat grinder mitigates these problems by using a capacitor to recapture the energy in the leakage flux and to slow down the turnoff of current in one of the inductors. The energy from the leakage flux is then used to reverse the current on the turned-off inductor, thereby further increasing the current multiplication. A system comprising several STRETCH meat grinders in parallel can develop currents in the mega-ampere range without exceeding the capabilities of solid-state switches. Such a system could be used to power a railgun.","PeriodicalId":200159,"journal":{"name":"2005 IEEE Pulsed Power Conference","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125874404","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Metafex®: Pulsed-Power Driven Explosive Replacements","authors":"D. Davison","doi":"10.1109/PPC.2005.300795","DOIUrl":"https://doi.org/10.1109/PPC.2005.300795","url":null,"abstract":"MetafexregDagger is an inert material that is more energetic than explosives when activated. Because Metafex is inert until activated (a moment before use), it can profoundly change the logistics of systems and processes that require energetic materials. We recently obtained positive test results for a Metafex configuration (called a flat pack) that operates at the practical voltage of ~20 kV. We describe the outcome of the testing, the potential uses of the material, and the opportunities for commercialization of related pulsed power components such as capacitors and switches.","PeriodicalId":200159,"journal":{"name":"2005 IEEE Pulsed Power Conference","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125878038","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
W. Carey, A. Wiebe, D. Schwindt, L. Altgilbers, M. Giesselmann, B. Mchale, K. Heinemann
{"title":"Autonomous RF Radiation Package for Various Applications","authors":"W. Carey, A. Wiebe, D. Schwindt, L. Altgilbers, M. Giesselmann, B. Mchale, K. Heinemann","doi":"10.1109/PPC.2005.300564","DOIUrl":"https://doi.org/10.1109/PPC.2005.300564","url":null,"abstract":"The development of an autonomous RF radiation package for various applications is presented. This work is a coordinated effort to develop a tightly integrated unit, including the batteries, power supply, Marx generator, and plug and play antennas for various applications. ARC technology has designed the Marx generator and its associated high voltage antennas for this effort. Previous work by ARC has demonstrated 75 mm diameter, 700 mm length diameter Marx generators capable of delivering 200 kV pulses into 50 Omega coaxial cable with sub-nanosecond risetimes, enabling it to drive an antenna and generate high power microwaves. This technology has been re-designed into a reduced length geometry and augmented by inductive charging to permit pulse repetition rates. The antenna is incorporated directly onto the Marx output for efficient energy transfer and for compactness. This package has demonstrated peak electric field strengths up to 4700 V/m at 10 m. Texas Tech University has worked closely with ARC in developing a rapid charging power supply to meet stringent package constraints and still permit high pulse repetition rates. This system has already demonstrated the ability to charge a 50 nF capacitance up to 40 kV with a repetition frequency of 100 Hz, delivering an average power of 4 kW. This paper details the present status of the project, which will be completed in July, 2005. The cylindrical geometry of the final package has a diameter of 155 mm, a length of approximately 1500 mm without the antenna, and a mass of approximately 35 kg, depending upon the chosen antenna implementation. Results of preliminary tests are included.","PeriodicalId":200159,"journal":{"name":"2005 IEEE Pulsed Power Conference","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125909748","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Testing and Evaluation of an Ultra-Wideband Pulse Generator for HPM Weapon Simulation","authors":"S. Merryman, F. Peterkin, W. Sessions, D. Stoudt","doi":"10.1109/PPC.2005.300627","DOIUrl":"https://doi.org/10.1109/PPC.2005.300627","url":null,"abstract":"The potential for high power microwave (HPM) and radio frequency weapons (RFW) to degrade or destroy electronics has been studied for decades. However, the fast pace of change in the underlying digital technologies of modern electronics makes it necessary to continually re-evaluate the susceptibilities of such systems. The Directed Energy Technology Office has developed a major test complex at the Naval Surface Warfare Center- Dahlgren Division (NSWCDD) to study the effectiveness of a variety of HPM and RFW prototypes. The facility consists of two concrete block buildings populated with a variety of modern commercial infrastructure electronics. In this paper we discuss a recent project which typifies the testing activities at the NSWCDD facility. Schriner Engineering, Inc. built a pulse generator, the S-30, to simulate an ultra-wideband RF weapon. The S- 30 operates from AC mains and uses a series of AC and pulsed transformers to charge a wide-band antenna structure up to 100's of kV. The S-30 radiates a fast risetime short pulse (<3 ns) when an oil-filled spark gap switch closes. We report our evaluation of the S-30 design and operation, measurements of the radiated output, and modeling of the antenna pattern. We also describe the electronic systems which were tested for susceptibility to the S-30 and the test protocol that was followed.","PeriodicalId":200159,"journal":{"name":"2005 IEEE Pulsed Power Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129530719","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
T. Hughes, T. Genoni, H. Davis, M. Kang, B. Prichard
{"title":"Numerical Model of the Darht-2 Accelerating Cell","authors":"T. Hughes, T. Genoni, H. Davis, M. Kang, B. Prichard","doi":"10.1109/PPC.2005.300527","DOIUrl":"https://doi.org/10.1109/PPC.2005.300527","url":null,"abstract":"The DARHT-2 facility at Los Alamos National Laboratory accelerates a nominally 2-musec, 2-kA electron beam to 18-MV using a series of inductive accelerating cells. The cell inductance is provided by large Metglas 2605SC cores, which are driven by pulse-forming networks. The original cell design was susceptible to electrical breakdown near the outer radius of the cores. We developed a numerical model for the magnetic properties of Metglas over the range of dB/dt (magnetization rate) relevant to DARHT, and implemented the model in the Lsp electromagnetic code. Lsp simulations showed that the field stress distribution across the outer radius of the cores was highly nonuniform. This was subsequently confirmed in experiments at LBNL. The calculated temporal evolution of the electric field stress inside the cores approximately matches experimental measurements. The cells have been redesigned to greatly reduce the field stresses along the outer radius, and a refurbishment program is underway.","PeriodicalId":200159,"journal":{"name":"2005 IEEE Pulsed Power Conference","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129777280","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Modeling Ferromagnetic Materials in Pulsed Power Systems","authors":"L. Schlitt","doi":"10.1109/PPC.2005.300465","DOIUrl":"https://doi.org/10.1109/PPC.2005.300465","url":null,"abstract":"The uses and modeling of ferromagnetic materials in pulsed power circuits is discussed. The properties of such materials and their impact on circuit performance are described and comparisons of circuit simulations with experimental data are presented.","PeriodicalId":200159,"journal":{"name":"2005 IEEE Pulsed Power Conference","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127264190","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
D. Wang, S. Yoshida, M. Jikuya, T. Namihira, S. Katsuki, H. Akiyama
{"title":"Observation of Pulsed Streamer Discharges Produced by Nano-Second Pulsed Power in Atmospheric Air","authors":"D. Wang, S. Yoshida, M. Jikuya, T. Namihira, S. Katsuki, H. Akiyama","doi":"10.1109/PPC.2005.300470","DOIUrl":"https://doi.org/10.1109/PPC.2005.300470","url":null,"abstract":"Pulsed power technology has been used in many applications such as control of NOx and SOx from exhaust gases, treatment of dioxins, removal of volatile organic compounds, and generation of ozone. Since the pulse width of the applied voltage has a strong influence on the energy efficiency of the removal of pollutants, the development of a short pulse generator is of paramount importance for practical applications. The observation of discharges created by short duration pulsed voltage is an essential aspect for understanding the plasma physics of this growing field. In the present work, a nano-second pulse generator (NS-PG) that has a pulse duration of less than 10 ns is presented. The NS-PG consists of a high-pressure spark gap switch as a low inductance self-closing switch and a triaxial Blumlein line as a pulse-forming line. The Blumlein line consists of an outer conductor, a middle conductor, and an inner conductor, and is filled up with transformer oil as an insulation medium. The outer conductor is grounded, and the nano-second pulse is generated between the inner and outer conductors. The characteristics of the NS-PG are also reported. The propagation images of the pulsed streamer discharge in a coaxial reactor were taken by a high speed streak camera. The propagation of the streamers was observed for both positive and negative polarities of the applied voltages to the reactor. From the results, for both polarities, the primary streamer propagated from the inner wire electrode to the outer cylinder electrode, and the maximum propagation velocity of the streamer was in the range 6.0 - 8.0 mm/ns over the voltage 67 - 93 kV of the absolute value of peak applied voltage. The results also showed that the propagation velocity of the streamers was strongly influenced by the voltage rise time and to a lesser extent by the voltage polarity.","PeriodicalId":200159,"journal":{"name":"2005 IEEE Pulsed Power Conference","volume":"81 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131943429","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}