Conference Record of the 2006 Twenty-Seventh International Power Modulator Symposium最新文献

{"title":"A Same-Scale Comparison of Electromagnetic Launchers","authors":"T. Engel, J. Neri, W. Nunnally","doi":"10.1109/MODSYM.2006.365270","DOIUrl":"https://doi.org/10.1109/MODSYM.2006.365270","url":null,"abstract":"A same-scale comparison of conventional railguns, augmented railguns, and helical launchers is presented and discussed. While the ideal launcher is always 100% efficient, practical launchers have an efficiency which is a function of the projectile velocity and a new parameter called the characteristic velocity. The characteristic velocity is the velocity needed for 50% maximum efficiency. The motivation for a same-scale comparison is an accounting for the velocity-dependent efficiency effect. The same scale concept states that launcher comparisons should be done on an equal bore diameter, launcher length, projectile mass, and velocity basis. Other parameters developed by the authors and included in the analysis, are the launcher constant and the mode constant that account for the launcher geometry and the mode of operation, respectively. The analysis uses experimental data collected by the authors with conventional railgun, augmented railgun, and helical gun launchers","PeriodicalId":410776,"journal":{"name":"Conference Record of the 2006 Twenty-Seventh International Power Modulator Symposium","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126507759","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":"The Marx Modulator Development Program for the International Linear Collider","authors":"G. Leyh","doi":"10.1109/MODSYM.2006.365274","DOIUrl":"https://doi.org/10.1109/MODSYM.2006.365274","url":null,"abstract":"The ILC Marx modulator development program at SLAC is working towards developing a full-scale ILC Marx 'reference design' modulator prototype, with the goal of significantly reducing the size and cost of the ILC modulator, while improving overall modulator efficiency and availability. The ILC reference design prototype will provide a proof-of-concept model to industry in advance of phase II SBIR funding, and also allow operation of the new 10MW L-Band Klystron prototypes immediately upon their arrival at SLAC","PeriodicalId":410776,"journal":{"name":"Conference Record of the 2006 Twenty-Seventh International Power Modulator Symposium","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121025618","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":"Compact Modulator For High Power Microwave Systems","authors":"K. McDonald","doi":"10.1109/MODSYM.2006.365268","DOIUrl":"https://doi.org/10.1109/MODSYM.2006.365268","url":null,"abstract":"Sci-Eng solutions has made significant progress towards the development of a \"direct-drive\" Marxed-coiled transmission pulse generator that incorporates solid dielectric nano-ceramic polymer coaxial transmission lines that are spiraled into axial coil \"compact disks\" and switched in a Marx generator configuration to produce high-voltage flat-topped pulses into narrow band high power microwave sources such as relativistic magnetrons","PeriodicalId":410776,"journal":{"name":"Conference Record of the 2006 Twenty-Seventh International Power Modulator Symposium","volume":"2014 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121473404","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":"Scaled-Up LGPT (Laser Gated and Pumped Thyristor) Devices at KrF IFE (Inertial Fusion Energy) Operating Parameters","authors":"D. Weidenheimer, D. Morton, G. James, D. Giorgi, T. Navapanich, D. Knudsen, R. Knight","doi":"10.1109/MODSYM.2006.365217","DOIUrl":"https://doi.org/10.1109/MODSYM.2006.365217","url":null,"abstract":"The LGPT devices are performing to specification in both di/dt and action per unit area, and have demonstrated durability beyond 107 shots at system rep-rate (5-7 pps). The present devices represent minimum-size building-block units for use in near and far-term KrF IFE laser drivers, and they employ on-board optical sources for direct illumination of the silicon thyristor structure. Typical operating parameters for the devices undergoing durability tests are 16.4 kV forward blocking, peak currents of 1.5 to 2.5 kA per cm2, for an 800 ns pulsewidth, and di/dt's of up to 25 kA/usec/cm2. Two practical methods are there for directly illuminating the silicon: through the electrode surfaces as has been practiced for the past 5 years, and a new method employing the laser bar arrays in a side-shine geometry. The nearest-term application for the devices is in the retro-fitting of the FE2 laser pre-amplifier. This driver employs a topology that is scaleable to KrF IFE power generation. It is a fast Marx-charged, single-stage magnetic pulse compressor. The Marx, as delivered in 2004, is gas-switched, but specifically designed to be retro-fitted with the first generation of the program's LGPT's. Full scale KrF IFE-class pulsed power compressors have also been conceptualized, and will be utilized in those full-scale designs in a follow-up program to further develop the technology","PeriodicalId":410776,"journal":{"name":"Conference Record of the 2006 Twenty-Seventh International Power Modulator Symposium","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125146254","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":"Production of Atmospheric-Pressure Glow Using Inductive Energy Storage System Pulsed Power Generator","authors":"K. Takaki, H. Kirihara, C. Noda, S. Mukaigawa, T. Fujiwara","doi":"10.1109/MODSYM.2006.365251","DOIUrl":"https://doi.org/10.1109/MODSYM.2006.365251","url":null,"abstract":"An atmospheric pressure glow discharge was generated using a needle-array electrode in nitrogen. A pulsed high voltage with short rise time under 10 ns was employed to generate streamer discharges simultaneously at all needle tips. The large number of streamer discharges prevented glow-to-arc transition caused by inhomogeneous thermalization. Semiconductor opening switch (SOS) diodes were employed as an opening switch to shorten the rise time. The glow current was drastically decreased by eliminating the SOS diode, in which case the charging voltage was directly applied to the electrode. Spatial- and time-averaged electron densities in a positive column were estimated from calculations based on nitrogen swarm data. The density was estimated to be 1.8times1011 cm-3, which was much larger than 9.7times109 cm-3 in the case without the SOS diode","PeriodicalId":410776,"journal":{"name":"Conference Record of the 2006 Twenty-Seventh International Power Modulator Symposium","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131120599","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":"On Electromagnetic Processes in HV Transformers of Switching-Mode Power Supplies at No-Load Conditions","authors":"A. Pokryvailo","doi":"10.1109/MODSYM.2006.365239","DOIUrl":"https://doi.org/10.1109/MODSYM.2006.365239","url":null,"abstract":"When applying some kind of waveform to the primary of a transformer, one expects to see a more or less resembling waveform at the secondary. This is not the case for high-frequency HV transformers. The basic reason is that the parasitic parameters (PP) (leakage inductance and numerous parasitic capacitances) have a considerable influence on the transformer performance. HV transformer equivalent circuits are discussed, and the choice of one for further analysis is theoretically and experimentally justified. It is shown that HV rectifier/multiplier adds considerably to the parasitic capacitance of the secondary winding at no-load conditions. Further analysis concentrates on the electromagnetic processes in a transformer fed by a square-wave voltage, which is characteristic for no-load operation. Overvoltages (OV), i.e., ratio of the maximum voltage at the secondary to that calculated by the transformation ratio, generated by high harmonics are analyzed using Fourier transform. For special cases of asymmetrical waveshapes, closed-form expressions are obtained. The influence of the primary voltage risetime on the OV is also analyzed. It is shown that the characteristic OV is close to three for steep risetimes. Main conclusions were upheld by PSpice simulations and experimental investigation","PeriodicalId":410776,"journal":{"name":"Conference Record of the 2006 Twenty-Seventh International Power Modulator Symposium","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133684164","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":"Electrical Parameters of High Current Capillary Discharge Device","authors":"J. Schmidt, K. Kolacek, O. Frolov, V. Prukner, J. Straus","doi":"10.1109/MODSYM.2006.365299","DOIUrl":"https://doi.org/10.1109/MODSYM.2006.365299","url":null,"abstract":"The CAPEX-U (capillary experiment -upgrade) apparatus has been developed as an XUV source based on high-current capillary discharge. Our main motivation for building such a new device was to create the XUV source with amplification of spontaneous emission at shorter wavelengths (below 20 nm), which have more practical applications. The preliminary experimental results of the assembled apparatus were obtained, especially the capillary current signal, and the time development of the pulse-forming-line voltage. The comparison of these experimental results with calculated/predicted values is reported in this paper as well","PeriodicalId":410776,"journal":{"name":"Conference Record of the 2006 Twenty-Seventh International Power Modulator Symposium","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116758971","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":"Analysis of Plasma Antenna Options for Explosively-Driven Microwave Generators and Outline of Plasma Antenna Design","authors":"K. O'connor, R. Curry, S. Kovaleski","doi":"10.1109/MODSYM.2006.365264","DOIUrl":"https://doi.org/10.1109/MODSYM.2006.365264","url":null,"abstract":"The development of portable microwave sources based upon explosively-driven generators requires the selection and design of an antenna that is well-suited to radiate the RF energy while meeting the very specific demands of the application. The magnetocumulative generator (MCG), which is often also called a flux-compression generator (FCG), the ferroelectric generator (FEG), and the ferromagnetic generator (FMG) convert the chemical energy of explosive materials into high-power electrical energy. Through power conditioning, the electrical energy converted from the explosive discharge can be radiated as microwaves. However, the extreme operating conditions for this application restrict the use of many conventional antennas and favor the use of some more unconventional plasma antenna systems. This paper provides an analysis of the viable plasma antenna options in which the plasma is actively radiating, as opposed to other designs in which plasma is used only to direct radiation from a metallic antenna. The four plasma antenna systems considered are based on laser-initiated ionization of atmosphere, confined plasma columns, silicon-based plasma, and an explosively-generated plasma jet. Each plasma antenna is analyzed on the device's operating principles, past experimental performances, and practical considerations when employed in an explosively-driven system. The explosively-generated plasma antenna is selected as the optimal plasma antenna for an explosively-driven mobile system. The explosively-generated plasma antenna has the favorable characteristics of having a common energy source with the explosive generators, being simple and durable in design to withstand the shock and thermal stresses of generator operation, relatively low mass and volume requirements, and high power capability. The significant radiating mechanisms of the explosively-generated plasma antenna and important plasma characteristics are outlined. The important considerations for the selection of explosive are detailed. Based upon the total plasma jet lifetime and the velocity of the combustion products in the jet, the minimal required mass of explosives is derived, completing the fundamental design parameters.","PeriodicalId":410776,"journal":{"name":"Conference Record of the 2006 Twenty-Seventh International Power Modulator Symposium","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123039473","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":"High-Gradient Insulators","authors":"J. Harris, R. Anaya, D. Blackfield, Y. Chen, S. Falabella, S. Hawkins, C. Holmes, A. Paul, S. Sampayan, D. Sanders, L. Wang, A. Watson, G. Caporaso, M. Krogh","doi":"10.1109/MODSYM.2006.365181","DOIUrl":"https://doi.org/10.1109/MODSYM.2006.365181","url":null,"abstract":"High voltage systems operated in vacuum require insulating materials to maintain spacing between conductors held at different potentials. Traditional vacuum insulators consist of a single material, often machined with a 45deg angle to suppress surface flashover. However, insulating structures composed of alternating layers of dielectric and metal can also be built, and have been experimentally shown to have higher breakdown voltages than conventional insulators. These \"high-gradient insulators\" allow closer spacing of components in vacuum, and therefore; have application to a wide range of high-voltage vacuum systems where compact size is important. This paper describes ongoing simulations and experimental work on these structures, as well as the theoretical understanding driving this research","PeriodicalId":410776,"journal":{"name":"Conference Record of the 2006 Twenty-Seventh International Power Modulator Symposium","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123512294","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":"Fundamental Properties of OFF-ON Resistance of a New Type Self-recovering Fuse Operated by Dielectrophoresis","authors":"S. Ohtsuka, H. Suetomi, M. Hikita","doi":"10.1109/MODSYM.2006.365287","DOIUrl":"https://doi.org/10.1109/MODSYM.2006.365287","url":null,"abstract":"This paper deals with fundamental properties of the OFF to ON state transition of a new type of self-recovering fuse (SRF) device operated by dielectrophoresis (DEP) we have proposed and developed. This fuse device basically consists of electrodes made on a substrate, a fuse element to make and break the conducting path between the electrode gap, and liquid matrix as insulation media to cover the fuse element and the electrodes. The self-recovering operation, i.e. the OFF to ON state transition, is mainly controlled by DEP and viscous forces. In this study, we experimentally investigated influence of the liquid matrix and the substrate material on the OFF and ON resistances of the SRF device in terms of improvement of the resistance characteristics. We also investigated the effect of a mechanical impact or vibration on the ON state properties. As a result, we achieved the OFF resistance more than 1 MOmega without remarkably increasing the ON resistance, by using silicone oil as liquid matrix and the glass substrate. We confirmed the self-recovering operation by DEP and the maintaining ON state under both DC and high frequency (up to 100 kHz) AC voltage applications. In addition, the mechanical impact endurance of the SRF device was basically found","PeriodicalId":410776,"journal":{"name":"Conference Record of the 2006 Twenty-Seventh International Power Modulator Symposium","volume":"233 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122066291","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}