Digest of Technical Papers. PPC-2003. 14th IEEE International Pulsed Power Conference (IEEE Cat. No.03CH37472)最新文献_第3页

Test stand for linear induction accelerator optimization 直线感应加速器试验台优化

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.2003.1277958

M. Ong, B. DeHope, K. Griffin, D. Goerz, R. Kihara, G. Vogtlin, J. Zentler, R. Scarpetti

{"title":"Test stand for linear induction accelerator optimization","authors":"M. Ong, B. DeHope, K. Griffin, D. Goerz, R. Kihara, G. Vogtlin, J. Zentler, R. Scarpetti","doi":"10.1109/PPC.2003.1277958","DOIUrl":"https://doi.org/10.1109/PPC.2003.1277958","url":null,"abstract":"Lawrence Livermore National Laboratory has designed and constructed a test stand to improve the voltage regulation in our flash X-Ray (FXR) accelerator cell. The goal is to create a more mono-energetic electron beam that creates an X-ray source with a smaller spot size. Studying the interaction of the beam and pulse-power system with the accelerator cell improves the design of high-current accelerators at Livermore and elsewhere. On the test stand, a standard FXR cell is driven by a flexible pulse-power system and the beam current is simulated with a switched center conductor. The test stand is fully instrumented with high-speed digitizers to document the effect of impedance mis-matches when the cell is operated under various full-voltage conditions. A time-domain reflectometry technique was also developed to characterize the beam and cell interactions by measuring the impedance of the accelerator and pulse-power component. Computer models are being developed in parallel with the testing program to validate the measurements and evaluate different design changes. Both 3D transient electromagnetic and circuit models are being used.","PeriodicalId":143385,"journal":{"name":"Digest of Technical Papers. PPC-2003. 14th IEEE International Pulsed Power Conference (IEEE Cat. No.03CH37472)","volume":"6 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":"128022113","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

Simulations of a high power 4H-SiC VJFET and its GaAs counterpart 高功率4H-SiC VJFET及其等效GaAs的仿真

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.2003.1277674

Q. Shui, X. Gu, C. Myles, M. Mazzola, M. Gundersen

引用次数: 7

Pseudospark based pulse forming circuit for plasma ignition system 基于伪火花的等离子点火系统脉冲形成电路

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.2003.1277724

F. Wang, A. Kuthi, C. Jiang, M. Gundersen

引用次数: 6

Nanosecond laser-triggered microwave switch 纳秒激光触发微波开关

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.2003.1277717

M. McQuage, A. Neuber, J. Dickens

{"title":"Nanosecond laser-triggered microwave switch","authors":"M. McQuage, A. Neuber, J. Dickens","doi":"10.1109/PPC.2003.1277717","DOIUrl":"https://doi.org/10.1109/PPC.2003.1277717","url":null,"abstract":"The design and experimental testing of a laser-triggered microwave switch with a nanosecond activation time is described. The objectives of the project include, confirming that a nanosecond to subnanosecond risetime is achievable in the X-band waveguide at 9 GHz with the laser-triggered switch and to determine the minimum laser energy necessary to obtain the fastest possible risetime. A 1 kW pulsed X-band source with a 500 ns output pulse provides the microwave power for the system. A variable power Nd:YAG laser with a maximum 450 mJ at 532 nm, 10 ns FWHM output pulse is used in conjunction with an applied high voltage pulse to trigger the microwave switch. The microwave signal is switched with the rapid formation of plasma caused by the breakdown of a gas contained by a quartz tube inserted through a section of waveguide. The centerpiece of the waveguide system is a magic tee, which controls the direction of power flow through the system. Compared to tests in air and N/sub 2/, the best results have been obtained in argon. Risetimes below 2 ns have been obtained using argon at a reduced pressure of 150 Torr and a high voltage pulse of 28 kV from a spark gap. The impact of gas pressure, applied voltage pulse and applied laser pulse on the risetime of the microwave switch are discussed.","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":"115841838","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

Solid state stepped transmission line transformer for spark gap triggering 用于火花间隙触发的固态阶梯式输电线路变压器

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.2003.1277969

M. Behrend, A. Kuthi, M. Gundersen

引用次数: 0

Laser-triggered water switching 激光触发水开关

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.2003.1277781

J.R. Woodwork, D.L. Johnson

{"title":"Laser-triggered water switching","authors":"J.R. Woodwork, D.L. Johnson","doi":"10.1109/PPC.2003.1277781","DOIUrl":"https://doi.org/10.1109/PPC.2003.1277781","url":null,"abstract":"We are experimentally exploring the use of lasers as a method of command triggering high-voltage water switches, by focusing the laser light to a breakdown arc in pure water. We are using Nd-YAG laser radiation at 1064 nm and its harmonics at 532, 355, and 266 nm. We report a measured breakdown threshold of 1.4 /spl times/ 10/sup 10/W/cm/sup 2/ at 532 nm, a power level that is easy to achieve with commercially-available lasers. The breakdown threshold is an order of magnitude higher for 1064 nm or 355 nm light. Scattering of the laser beam by laser-induced index of refraction gradients is noticeable at 532 nm and becomes an increasing problem at shorter wavelengths, preventing us from breaking down water at all at 266 nm. We produced breakdown arcs more than 4-cm in length by focusing 75 mJ of 532 nm laser energy in water with a 29-cm-focal-length lens. In addition to the breakdown arcs, we note that focusing 532-nm light into pure water vibrationally excites the water, causing the generation of coherent beams of red Raman-shifted radiation. The vibrationally-excited columns of water are readily visible as they emit red light in all directions. Some of the vibrationally-excited water columns we observed were over 30 cm long.","PeriodicalId":143385,"journal":{"name":"Digest of Technical Papers. PPC-2003. 14th IEEE International Pulsed Power Conference (IEEE Cat. No.03CH37472)","volume":"15 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":"132074145","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: 4

Solid-state hybrid modulator for the next linear collider 用于下一个线性对撞机的固态混合调制器

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.2003.1277769

J. Casey, M. Gaudreau, M. Kempkes, J. Eichner, S. Gold, R. Koontz

引用次数: 7

Semiconductor modeling for multi-layer, high field, photo-switch using sub-bandgap photons 利用子带隙光子的多层高场光开关的半导体建模

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.2003.1277935

K. Kelkar, W. Nunnally

引用次数: 3

Filamentation instability of self-focused hollow electron beam 自聚焦空心电子束的成丝不稳定性

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.2003.1277983

H. Uhm, E. Choi

引用次数: 0

Treatment of SO2 by pulsed, intense relativistic electron beam in distant gas chamber 远距离气室中脉冲强相对论电子束处理二氧化硫

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.2003.1278059

G. Imada, H. Ochiai, T. Sakurai, K. Yatsui

引用次数: 1