Digest of Technical Papers. PPC-2003. 14th IEEE International Pulsed Power Conference (IEEE Cat. No.03CH37472)最新文献_第7页

NOx decomposition with repetitive discharges by reciprocal voltage pulse in a coaxial cable 同轴电缆中互反电压脉冲重复放电分解氮氧化物

Digest of Technical Papers. PPC-2003. 14th IEEE International Pulsed Power Conference (IEEE Cat. No.03CH37472) Pub Date : 2003-06-15 DOI: 10.1109/PPC.2003.1277774

K. Kadowaki, S. Nishimoto, I. Kitani

引用次数: 0

Repetitive pulsed power to serve nanotechnology, sustainability and hydrogen production 重复脉冲功率服务于纳米技术、可持续性和氢气生产

Digest of Technical Papers. PPC-2003. 14th IEEE International Pulsed Power Conference (IEEE Cat. No.03CH37472) Pub Date : 2003-06-15 DOI: 10.1109/PPC.2003.1277746

E. V. van Heesch, K. Yan, A. Pemen, S. Nair, G. Winands, W. Kolkert, A. Barba

引用次数: 5

Nanosecond pulse generators for microdischarge excimer lamps 微放电准分子灯用纳秒脉冲发生器

Digest of Technical Papers. PPC-2003. 14th IEEE International Pulsed Power Conference (IEEE Cat. No.03CH37472) Pub Date : 2003-06-15 DOI: 10.1109/PPC.2003.1278057

M. Moselhy, K. Schoenbach

引用次数: 6

Sub-nanosecond point-plane gas breakdown in a conical-shaped spark gap 锥形火花隙中亚纳秒点平面气体击穿

Digest of Technical Papers. PPC-2003. 14th IEEE International Pulsed Power Conference (IEEE Cat. No.03CH37472) Pub Date : 2003-06-15 DOI: 10.1109/PPC.2003.1278064

J. Spears, H. Krompholtz, L. Hatfield

{"title":"Sub-nanosecond point-plane gas breakdown in a conical-shaped spark gap","authors":"J. Spears, H. Krompholtz, L. Hatfield","doi":"10.1109/PPC.2003.1278064","DOIUrl":"https://doi.org/10.1109/PPC.2003.1278064","url":null,"abstract":"Breakdown with sub-nanosecond delay time is of interest for high-speed low rep-rated switching and for plasma limiters to protect sensitive RADAR equipment from EM bursts. In order to apply fast high-voltage pulses to a test spark-gap without major pulse distortion, we use a coaxial transmission-line connected via a conical section to the spark-gap. Conventional gaps integrated into the inner conductor of a coaxial transmission-line with point-plane geometry suffer from major impedance mismatches as well as lumped capacitances. This limits the pulse risetime at the gap to at least one nanosecond. A gradual reduction of the inner and outer-conductor diameters was used in the conical section. This resulted in a voltage risetime across the gap of about 500 ps, where an original pulser risetime of 400 ps was used. Measured breakdown delay times, as a function of pressure in argon, show delay-time minima of less than 600 ps at a pressure of several torr and applied voltage amplitudes of 10 kV, for radii of curvature < 0.5/spl mu/m. Typical current amplification times, I/(dI/dt), are on the order of several 10/sup -10/ sec. Experiments with repetition rates of up to 1 kHz do not show any differences to single shot discharges at atmospheric pressures. At larger radii of curvature (10 /spl mu/m), corona-type discharges are observed with both point polarities, with currents smaller than 10/sup -4/ A, also without any differences between single shot and 1 kHz rep-rate.","PeriodicalId":143385,"journal":{"name":"Digest of Technical Papers. PPC-2003. 14th IEEE International Pulsed Power Conference (IEEE Cat. No.03CH37472)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125336169","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}

引用次数: 3

Analysis of explosively formed fuse experiments 爆炸形成引信实验分析

Digest of Technical Papers. PPC-2003. 14th IEEE International Pulsed Power Conference (IEEE Cat. No.03CH37472) Pub Date : 2003-06-15 DOI: 10.1109/PPC.2003.1277738

J. Goforth, H. Oona, D. Tasker, J. King, D. Herrera, D. Torres, E. Lopez, W. Atchison, I. Lindermuth

{"title":"Analysis of explosively formed fuse experiments","authors":"J. Goforth, H. Oona, D. Tasker, J. King, D. Herrera, D. Torres, E. Lopez, W. Atchison, I. Lindermuth","doi":"10.1109/PPC.2003.1277738","DOIUrl":"https://doi.org/10.1109/PPC.2003.1277738","url":null,"abstract":"Explosively formed fuse (EFF) opening switches have been used in a variety of applications to divert current in high explosive pulsed power (HEPP) experiments. Typically, EFF's operate at 0.1-0.2 MA/(cm switch width), and have an /spl sim/2 /spl mu/s risetime to a resistance of 10's-100's m/spl Omega/. We have demonstrated voltage standoff of /spl sim/7 KV/(die pattern) in some configurations, and typical switches have up to 100 die patterns. In these operating regimes, we can divert large currents (10-20 MA) to low impedance loads, and produce voltage waveforms with risetime and shape determined by the shape of the resistance curve and amount of magnetic flux in the circuit. Progress in quantitatively modeling EFF performance with magnetohydrodynamic (MHD) codes has been slow, and much of our understanding regarding the operating principles of EFF switches still comes from small-scale experiments coupled with hydrodynamic (hydro) calculations. These experiments are typically conducted at currents of /spl sim/0.5 MA in a conductor 6.4 cm wide. A plane-wave detonation system is used to drive the EFF conductor into the forming die, and current and voltage are recorded. The resulting resistance profiles are compared to the hydro calculations to get insight into the operating mechanisms. Our original goals for EFF development were limited in scope, and in pursuing specific large systems, we have left behind a valuable body of small-scale test data that has been largely unused. We now have a charter to achieve a complete understanding of EFF devices, and our first step has been to review existing data. In this paper, we present some of the results of these investigations.","PeriodicalId":143385,"journal":{"name":"Digest of Technical Papers. PPC-2003. 14th IEEE International Pulsed Power Conference (IEEE Cat. No.03CH37472)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129743893","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}

引用次数: 5

Temporal emission behavior of pulsed discharge in water 水中脉冲放电的时间发射特性

Digest of Technical Papers. PPC-2003. 14th IEEE International Pulsed Power Conference (IEEE Cat. No.03CH37472) Pub Date : 2003-06-15 DOI: 10.1109/PPC.2003.1277970

Xinpei Lu, M. Laroussi, J. Kolb, S. Kono, K. Schoenbach

{"title":"Temporal emission behavior of pulsed discharge in water","authors":"Xinpei Lu, M. Laroussi, J. Kolb, S. Kono, K. Schoenbach","doi":"10.1109/PPC.2003.1277970","DOIUrl":"https://doi.org/10.1109/PPC.2003.1277970","url":null,"abstract":"To move the high energy pulsed power systems from the laboratory to practice requires the development of compact lightweight drivers. To reduce the size and weight of high voltage components, increase in the energy density in dielectrics at high electric stress is required. Therefore, an in-depth understanding of the hold-off voltage and breakdown properties of liquid dielectrics can lead to the optimization of energy storage. When breakdown is initiated in liquid dielectrics, vapor bubbles are generated, which first expand and later collapse. The total time of expansion and collapse of these bubbles determines the repetition rate at which high voltage switches can be operated. In this paper, a Blumlein pulse forming network (PFN) and sphere-plane electrode configuration is used for studying a pulsed discharge in water. The diameter of the spherical electrode is 1.7 mm and the gap distance between the electrodes is several hundred micrometers. The temporal development of the optical emission in the UV and visible after breakdown was measured by means of an imaging spectrograph. The radiation intensity reaches its maximum 5 ns after breakdown. It remains at this level for about 100 ns, and then the light intensity decreases to 30% of its peak value on a 10 ns time scale. The current was found to be 800 A during the pulse. The radiation spectrum of the plasma in the bubble during the 100 ns after breakdown was also measured. No line radiation was observed. The measured spectrum was found to follow a blackbody radiation law. Therefore by comparing the measured spectrum with that of calculated blackbody radiation at different temperatures, the plasma temperature was determined. It was found to be in the 1-2 eV range.","PeriodicalId":143385,"journal":{"name":"Digest of Technical Papers. PPC-2003. 14th IEEE International Pulsed Power Conference (IEEE Cat. No.03CH37472)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131370561","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}

引用次数: 5

Electromagnetic flux-compression: detailed two-dimensional modelling 电磁通量压缩:详细的二维建模

Digest of Technical Papers. PPC-2003. 14th IEEE International Pulsed Power Conference (IEEE Cat. No.03CH37472) Pub Date : 2003-06-15 DOI: 10.1109/PPC.2003.1278054

B. Novac, I. R. Smith

引用次数: 1

Design criteria for prevention of armature "turn-skipping" in helical magnetic flux compression generators 螺旋磁通压缩发电机中防止电枢“跳圈”的设计准则

Digest of Technical Papers. PPC-2003. 14th IEEE International Pulsed Power Conference (IEEE Cat. No.03CH37472) Pub Date : 2003-06-15 DOI: 10.1109/PPC.2003.1277998

J. Rasty, X. Le, J. Dickens, A. Neuber, M. Kristiansen

{"title":"Design criteria for prevention of armature \"turn-skipping\" in helical magnetic flux compression generators","authors":"J. Rasty, X. Le, J. Dickens, A. Neuber, M. Kristiansen","doi":"10.1109/PPC.2003.1277998","DOIUrl":"https://doi.org/10.1109/PPC.2003.1277998","url":null,"abstract":"Helical magnetic flux compression generators (MFCGs) are capable of producing ultra-high power electric pulses by trapping and compressing a seed magnetic field into a load coil via an explosive-driven armature. The efficiency of helical MFCGs is generally very low, about 10%, due to large magnetic flux losses. One of the main sources of magnetic flux loss is the \"turn-skipping\" phenomenon, in which the expanding armature fails to establish contact with every turn of the helical coil, resulting in magnetic flux loss in the skipped turns of the coil. The \"turn-skipping\" phenomenon is related to non-uniform or asymmetric expansion of the armature, as well as detonation end effects. Equations describing the \"turn skipping\" phenomenon are developed in terms of the eccentricity of the armature with respect to the helical coil, the armature's wall thickness variations and the length of the detonation end effect. Design criteria for prevention of \"turn-skipping\" are presented in order to achieve optimum MFCG performance.","PeriodicalId":143385,"journal":{"name":"Digest of Technical Papers. PPC-2003. 14th IEEE International Pulsed Power Conference (IEEE Cat. No.03CH37472)","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128678498","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}

引用次数: 2

High power, high recovery rate water switch 大功率、高回收率水开关

Digest of Technical Papers. PPC-2003. 14th IEEE International Pulsed Power Conference (IEEE Cat. No.03CH37472) Pub Date : 2003-06-15 DOI: 10.1109/PPC.2003.1277793

S. Xiao, J. Kolb, S. Kono, S. Katsuki, R. Joshi, M. Laroussi, K. Schoenbach

{"title":"High power, high recovery rate water switch","authors":"S. Xiao, J. Kolb, S. Kono, S. Katsuki, R. Joshi, M. Laroussi, K. Schoenbach","doi":"10.1109/PPC.2003.1277793","DOIUrl":"https://doi.org/10.1109/PPC.2003.1277793","url":null,"abstract":"The high dielectric strength of water, which may reach values of 1 MV/cm makes it an attractive switching medium for high power, low inductance switches. For water switches that operate at voltages of tens of kV, and currents of less than 1 kA, the dielectric recovery time is approximately 1 ms. The recovery process is determined by the decay of a vapor bubble due to the energy deposition in the liquid during breakdown and conduction. To reduce the recovery time, and consequently increase the recovery rate, we flowed water through the switch volume to remove the vapor bubble on a time scale less than the recovery time in static water. Flowing the water transversely through the rod-pin electrode gap with a flow rate of 0.56 1/min allows us to shorten the recovery time to 700 /spl mu/s. Using axial laminar flow with a flow rate of 0.41/min through a nozzle-pin electrode system yields similar results. The recovery rate, the inverse of the recovery time, was, in this case, increased from 1 kHz in static water 1.4 kHz. Increasing the flow rate only causes an increase in recovery rate as long as the flow is laminar; beyond the transition from laminar into turbulent flow, the hold-off voltage decreases. Improvements of the design of the flow-through system such that the transition from laminar into turbulent flow occurs at higher flow velocity will lead to increases in recovery rate. Further increase in recovery rate can be achieved by operating the switch at a reduced breakdown voltage. Using axial flow and operating the switch at a breakdown voltage of 82% of its full dielectric strength allows us to reach recovery rates of 2 kHz.","PeriodicalId":143385,"journal":{"name":"Digest of Technical Papers. PPC-2003. 14th IEEE International Pulsed Power Conference (IEEE Cat. No.03CH37472)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128857629","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}

引用次数: 12

Status of the Nevada shocker at the University of Nevada Las Vegas 内华达大学拉斯维加斯分校内华达震波的现状

Digest of Technical Papers. PPC-2003. 14th IEEE International Pulsed Power Conference (IEEE Cat. No.03CH37472) Pub Date : 2003-06-15 DOI: 10.1109/PPC.2003.1278035

R. Schill, W. Culbreth, C. Nielsen, M. Popek, N. Sipe, B. Blackstone, S. Goldfarb, W. Fitzgerald, J. Larson, M. Walker, S. Nosal, G. Lull, J. Viggato, T. Raymond, V. Subramanian, R. Kant, B. Murugan, S. Çapar

{"title":"Status of the Nevada shocker at the University of Nevada Las Vegas","authors":"R. Schill, W. Culbreth, C. Nielsen, M. Popek, N. Sipe, B. Blackstone, S. Goldfarb, W. Fitzgerald, J. Larson, M. Walker, S. Nosal, G. Lull, J. Viggato, T. Raymond, V. Subramanian, R. Kant, B. Murugan, S. Çapar","doi":"10.1109/PPC.2003.1278035","DOIUrl":"https://doi.org/10.1109/PPC.2003.1278035","url":null,"abstract":"The Nevada shocker is a 540 kV, 7 /spl Omega/, 50 ns pulsed power device based on Marx bank and Blumlein technologies. The Marx bank is composed of nine 60 kV capacitors charged in series with a gamma high voltage source connected by means of Ross relays in an air environment. A trigatron switch energized with an isolated mini capacitor bank is used to erect the Marx bank. The trigatron switch and erecting electrodes are contained in a gas manifold pressurized to 20 /spl plusmn/ 1 psi with dry air. The energy is released sequentially through an inductor and a water filled charging transmission line to the Blumlein immersed in deionized water. The Blumlein shapes and compresses the energy into a 50 ns pulse upon discharge. A self-breaking water switch initiates the release of energy in the Blumlein. The energy flows through a water filled discharging transmission line to the diode end of the Nevada Shocker. The current diode end of the Blumlein supports vacuum pressures as low as 6.5 /spl times/ 10/sup -6/ Torr. The chamber is pumped with the aid of a roughing pump and a cryogenic vacuum pump. The vacuum section of the Nevada Shocker is currently being rebuilt to incorporate mechanical and thermal loading capabilities with sensors located at the experiment. A number of diagnostic developments are currently underway to support flashover studies on plastics. Resistive probe and differential B-dot diagnostics with the aid of a 6 GHz 20 GS/s TDS 6604 real time scope is documented demonstrating the capability of the machine.","PeriodicalId":143385,"journal":{"name":"Digest of Technical Papers. PPC-2003. 14th IEEE International Pulsed Power Conference (IEEE Cat. No.03CH37472)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122414466","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}

引用次数: 0