2005 IEEE Pulsed Power Conference最新文献_第10页

Effects of the Multi-Switch Excitation on the Responsiveness of a Blumlein Line 多开关激励对Blumlein线路响应性的影响

2005 IEEE Pulsed Power Conference Pub Date : 2005-06-13 DOI: 10.1109/PPC.2005.300751

M. Joler, C. Christodoulou, E. Schamiloglu, J. Gaudet

引用次数: 2

Pulsed Dielectric Surface Flashover at Atmospheric Conditions 大气条件下脉冲介质表面闪络

2005 IEEE Pulsed Power Conference Pub Date : 2005-06-13 DOI: 10.1109/PPC.2005.300540

K. Morales, J. Krile, A. Neuber, H. Krompholz

{"title":"Pulsed Dielectric Surface Flashover at Atmospheric Conditions","authors":"K. Morales, J. Krile, A. Neuber, H. Krompholz","doi":"10.1109/PPC.2005.300540","DOIUrl":"https://doi.org/10.1109/PPC.2005.300540","url":null,"abstract":"Dielectric flashover along insulators in vacuum has been sufficiently researched in the past. Less studied, but of similar importance, is surface flashover at atmospheric pressures and the impact of various electrode geometries, humidity, and type of gas present. Previous research has shown distinct arc behavior in air and nitrogen for an electrode geometry in which the electric field lines curve above the dielectric surface. Specifically, flashover experiments in nitrogen have shown that the arc path will follow the electric field lines, not the dielectric surface. As a result, it was concluded that the arc development path, whether along the electric field line or the surface of the dielectric, is related to the oxygen content in the atmospheric background. It is believed that this dependence is due to the arc's production of UV radiation in an oxygen rich environment. Further testing, in a pure nitrogen environment with UV illumination of the surface prior to the pulse application, has shown that UV plays a significant role in the arc development path. There is a near linear relationship between the percentage of liftoffs and the time delay between UV application and flashover. Additional studies have also shown a relationship between the UV intensity and the percentage of liftoffs. Based on these results we will discuss the physical mechanisms primarily involved in unipolar flashover at atmospheric pressure. Additional experimental results regarding the effects of humidity on the liftoff phenomenon will be presented as well.","PeriodicalId":200159,"journal":{"name":"2005 IEEE Pulsed Power Conference","volume":"27 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":"126919093","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: 8

A 3kV/1.5A/2kHz Compact Modulator for Nitrogen Ion Plasma Implantation 用于氮离子等离子体注入的3kV/1.5A/2kHz紧凑型调制器

2005 IEEE Pulsed Power Conference Pub Date : 2005-06-13 DOI: 10.1109/PPC.2005.300480

J. O. Rossi, M. Ueda, J. Barroso

引用次数: 1

Flash X-Ray (FXR) Accelerator Optimization Injector Voltage-Variation Compensation via Beam-Induced Gap Voltage 闪光x射线(FXR)加速器优化注入器电压变化补偿的光束感应间隙电压

2005 IEEE Pulsed Power Conference Pub Date : 2005-06-13 DOI: 10.1109/PPC.2005.300502

M. Ong

{"title":"Flash X-Ray (FXR) Accelerator Optimization Injector Voltage-Variation Compensation via Beam-Induced Gap Voltage","authors":"M. Ong","doi":"10.1109/PPC.2005.300502","DOIUrl":"https://doi.org/10.1109/PPC.2005.300502","url":null,"abstract":"Lawrence Livermore National Laboratory (LLNL) is evaluating design alternatives to improve the voltage regulation in our injector and accelerator cells of our Flash X-Ray (FXR) machine. The operational peak electron beam current and energy at the X-ray generating target are 3.2 kA and 17 MeV. The goal is to create a more mono-energetic electron beam with variation of less than 1%-root-mean-squared (rms). This would allow the beam to be focused more tightly and create an X-ray source with a smaller spot-size. Our injector appears to have significant voltage-variation, and this report describes a technique to appreciably correct the deviations. When an electron beam crosses the energized gap of an accelerator cell, the energy increases. However, the beam with the associated electromagnetic wave also loses a small amount of energy because of the increased impedance seen across each gap. The phenomenon is sometimes called beam loading. It can also be described as a beam-induced voltage at the gap which is time varying. The polarity of this induced voltage is the opposite of the voltage in the injector. The time varying profiles of the injector and induced gap voltage are related through the beam current. However, while the change in magnitude is similar, they are not exactly the same. With the right choice of cell and pulse-power system impedance, the injector variations can be greatly reduced by cancellation, but not totally eliminated. The FXR injector voltage is estimated to be 2.5 MV-peak. The variation is estimated to be about 3.0%-rms for an interval of 60 ns. A simplified mathematical explanation of voltage compensation is given, and an idealized injector profile is used to quantify the effectiveness in a computer simulation. The result calls for a constant cell and pulse-power system impedance of 12.1 Omega. For this impedance, the compensated injector voltage-variation is less than 0.1%-rms.","PeriodicalId":200159,"journal":{"name":"2005 IEEE Pulsed Power Conference","volume":"92 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":"124039548","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

Two-Dimensional Pic Simulation of Spark Gaps with Longitudinal Magnetic Fields 纵向磁场下火花间隙的二维Pic模拟

2005 IEEE Pulsed Power Conference Pub Date : 2005-06-13 DOI: 10.1109/PPC.2005.300737

G. Singh, S. Chaturvedi

引用次数: 2

A Magic Simulation of a Mosfet Analogy in High Power Closing Switch: Insulated Electrostatic Plasma Injection Switch (IEPIS) 大功率闭合开关中Mosfet类比的神奇模拟:绝缘静电等离子体注入开关(IEPIS)

2005 IEEE Pulsed Power Conference Pub Date : 2005-06-13 DOI: 10.1109/PPC.2005.300739

M. Chung

{"title":"A Magic Simulation of a Mosfet Analogy in High Power Closing Switch: Insulated Electrostatic Plasma Injection Switch (IEPIS)","authors":"M. Chung","doi":"10.1109/PPC.2005.300739","DOIUrl":"https://doi.org/10.1109/PPC.2005.300739","url":null,"abstract":"Previously we reported a novel gas discharge closing switch termed electrostatic plasma injection switch (EPIS) with which uses transmission line reflections of incoming trigger pulse to generate voltage gradients on a vertical multi-sections trigger structure that extends from a hollow cathode into a symmetrical hollow anode. Low current pre-ionization glow discharge exterior to the hollow cathode provides seed electrons for fast turn-on. The trigger structure attracts plasma into the hollow cathode, and then accelerates plasma vertically upward into the gap between anode and cathode. A pseudospark like super-dense glow discharge plasma initiates the high current. This prototype EPIS has one disadvantage: there are two modes of operation, normal and abnormal modes. Now we propose a further improvement termed insulated EPIS (IEPIS), which has an insulated trigger structure that can ensure EPIS operates in the normal mode, which means breakdown occurs only between anode and cathode, and not between anode and pre-ionization area or anode and the trigger. This operational principle of IEPIS is very similar to MOSFET in electronics. IEPIS is expected to have higher repetition rates with enhanced reliability, and consume less power to trigger. We present a MAGIC simulation of its space charge evolution, electron density distributions evolution, and electron velocity distribution in various stages of IEPIS.","PeriodicalId":200159,"journal":{"name":"2005 IEEE Pulsed Power Conference","volume":"8 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":"126496492","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

Design Methodology for Dual Resonance Pulse Transformers 双共振脉冲变压器的设计方法

2005 IEEE Pulsed Power Conference Pub Date : 2005-06-13 DOI: 10.1109/PPC.2005.300516

Zac Shotts, Frank Rose, Steve Merryman, Ray Kirby

引用次数: 3

The Impact of Electrode Material on the Pulsed Breakdown Strength of Water 电极材料对水脉冲击穿强度的影响

2005 IEEE Pulsed Power Conference Pub Date : 2005-06-13 DOI: 10.1109/PPC.2005.300447

D. Wetz, J. Mankowski, J. Dickens, M. Kristiansen

引用次数: 1

Development of Nanosecond Pulsed Corona on a Twin Line 双线纳秒脉冲电晕的研究进展

2005 IEEE Pulsed Power Conference Pub Date : 2005-06-13 DOI: 10.1109/PPC.2005.300543

A. Pokryvailo, Y. Yankelevich, N. Nissim, R. Baksht, J. Ashkenazy

引用次数: 0

Repetitive Nanosecond All-Solid-State Pulse Generator Using Magnetic Switch and SOS Diodes 使用磁开关和SOS二极管的重复纳秒全固态脉冲发生器

2005 IEEE Pulsed Power Conference Pub Date : 2005-06-13 DOI: 10.1109/PPC.2005.300504

G. Rim, B. Min, E. Pavlov, J. Kim

{"title":"Repetitive Nanosecond All-Solid-State Pulse Generator Using Magnetic Switch and SOS Diodes","authors":"G. Rim, B. Min, E. Pavlov, J. Kim","doi":"10.1109/PPC.2005.300504","DOIUrl":"https://doi.org/10.1109/PPC.2005.300504","url":null,"abstract":"This paper proposes a new high speed and high voltage pulser using the low-voltage thyristors and magnetic switches with ferrite core. The proposed scheme consists of a step-up transformer with the function of magnetic switch, primary charging circuit using low- voltage thyristors, and Fitch's scheme composed of two magnetic switches and two capacitors in the secondary side. The primary winding of the step-up transformer has only one turn. To reduce further the leakage inductance of the primary windings, 40 branches are used in parallel. To compress the pulse, Fitch's scheme is used. All switches in Fitch's scheme are magnetic switches with ferrite cores. The ferrite core has low core loss and no insulation problem. With the load of 48Omega and lkV DC input voltage, the experiment results show that the output voltage is 58kV, the pulse width is 72ns (FWHM), and the rising time is 30ns. The magnetic switch is changed with SOS diode. With same load, the pulse output voltage is increased to 63kV, the rising time is 32ns, and the pulse width (FWHM) is 63ns. With the 96Omega, the output voltage is 71kV, the rising time is 36ns, and the pulse width is 48ns.","PeriodicalId":200159,"journal":{"name":"2005 IEEE Pulsed Power Conference","volume":"91 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":"133678759","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: 10