Digest of Technical Papers. 12th IEEE International Pulsed Power Conference. (Cat. No.99CH36358)最新文献_第8页

MACH2 simulations of an electrothermal gun 电热枪的MACH2模拟

Digest of Technical Papers. 12th IEEE International Pulsed Power Conference. (Cat. No.99CH36358) Pub Date : 1999-06-27 DOI: 10.1109/PPC.1999.823598

D. Keefer, R. Rhodes

{"title":"MACH2 simulations of an electrothermal gun","authors":"D. Keefer, R. Rhodes","doi":"10.1109/PPC.1999.823598","DOIUrl":"https://doi.org/10.1109/PPC.1999.823598","url":null,"abstract":"Electrothermal guns utilize an ablation stabilized pulsed capillary arc discharge to generate a high-pressure propellant gas. The plastic propellant, usually polyethylene, is ablated from the capillary walls by absorption of the radiative flux from the arc discharge. Similar capillary discharges have also been used to ignite conventional gun propellants in electrothermal-chemical (ETC) guns. During the rising part of the current pulse, there are rapid changes in the chamber pressure and temperature as shocks propagate from the capillary and then reflect from the base of the projectile and back into the capillary. This causes redistribution of the current density within the capillary altering the spatial ablation rates with time. MACH2 is a general purpose MHD code that has been used to simulate these complex electrical, hydrodynamic and radiation interactions for a 12 mm bore diameter electrothermal gun configuration tested at Institut St. Louis (ISL). The simulation domain includes the capillary discharge, and an expansion chamber extending to the projectile. The radiation was adjusted to match the measured pressure pulse and total ablated mass. Large radial and temporal variations in the velocity, temperature, density and radiation fields were observed in the simulations during the rising part of the current pulse. These results suggest that one-dimensional models may neglect some important physical processes.","PeriodicalId":11209,"journal":{"name":"Digest of Technical Papers. 12th IEEE International Pulsed Power Conference. (Cat. No.99CH36358)","volume":"18 1","pages":"658-661 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1999-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83520873","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

Steady state properties of lock-on current filaments in GaAs [pulsed power switches] GaAs[脉冲功率开关]中锁紧电流灯丝的稳态特性

Digest of Technical Papers. 12th IEEE International Pulsed Power Conference. (Cat. No.99CH36358) Pub Date : 1999-06-27 DOI: 10.1109/PPC.1999.823633

K. Kambour, S. Kang, C. Myles, H. Hjalmarson

引用次数: 0

Single shot and burst repetitive operation of involute gate 125 mm symmetric thyristors up to 221 kA with a di/dt of 2.0 kA//spl mu/s 单发和突发重复操作的渐开线栅极125毫米对称晶闸管高达221 kA, di/dt为2.0 kA//spl μ /s

Digest of Technical Papers. 12th IEEE International Pulsed Power Conference. (Cat. No.99CH36358) Pub Date : 1999-06-27 DOI: 10.1109/PPC.1999.825448

T. Podlesak, F. Simon, S. Schneider

{"title":"Single shot and burst repetitive operation of involute gate 125 mm symmetric thyristors up to 221 kA with a di/dt of 2.0 kA//spl mu/s","authors":"T. Podlesak, F. Simon, S. Schneider","doi":"10.1109/PPC.1999.825448","DOIUrl":"https://doi.org/10.1109/PPC.1999.825448","url":null,"abstract":"Previously (1998), the authors reported on the operation and limitations of a six-point star gate design 125 mm thyristor pulsed power switch. An involute gate design has been developed that provides a significant increase in its ability to handle higher peak currents and di/dts. For this study, they selected a 2.5 kV symmetric version of the device. The test facility uses a 10 m/spl Omega/ PFN with a rectangular pulse width (FWHM) of 465 /spl mu/s. All tests were performed with an essentially shorted load in order to achieve 200 kA operation and to instantaneously apply a full voltage reversal in less than 3 /spl mu/S at the end of the current pulse. Reliable operation was demonstrated at 2.6 kV forward voltage with a reverse voltage of 2.3 kV. The peak current was 203 kA with a di/dt of 1.8 kA//spl mu/s. The charge was 82 C and the action was 13.8 MA/sup 2/s. The reverse charge was 0.19 C. The PFN was modified to reduce the impedance and simulate a sinusoidal pulse in excess of 1 kHz. Reliable operation was obtained at 221 kA with a di/dt at 2.0 kA//spl mu/s. The pulse width (FWHM) was 301 /spl mu/s. With a base width of 455 /spl mu/s. Forward voltage was 2.4 kV with a reverse voltage of 2.3 kV. The forward charge, reverse charge and action were 63 C, 0.51 C and 10.9 MA/sup 2/s respectively. Reliable repetitive operation was performed at 151 kA with a burst of 10 pulses and a 20 second interval between pulses. No temperature effects were observed.","PeriodicalId":11209,"journal":{"name":"Digest of Technical Papers. 12th IEEE International Pulsed Power Conference. (Cat. No.99CH36358)","volume":"47 1","pages":"206-209 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1999-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84777858","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

The effect of variation of collisional gas parameters on theoretical electromagnetic transient breakdowns 碰撞气体参数变化对理论电磁瞬变击穿的影响

Digest of Technical Papers. 12th IEEE International Pulsed Power Conference. (Cat. No.99CH36358) Pub Date : 1999-06-27 DOI: 10.1109/PPC.1999.823789

D. Scholfield, J. Gahl, J. L. Borovina

引用次数: 1

To the theory of parallel railgun driven by an inductive storage power supply 对感应存储电源驱动并联轨道炮的原理进行了研究

Digest of Technical Papers. 12th IEEE International Pulsed Power Conference. (Cat. No.99CH36358) Pub Date : 1999-06-27 DOI: 10.1109/PPC.1999.823776

A. Pokryvailo

引用次数: 4

Improvement on Double-EAGLE machine synchronization in both negative and positive modes of operation 双鹰机在正反两种操作模式下的同步改进

Digest of Technical Papers. 12th IEEE International Pulsed Power Conference. (Cat. No.99CH36358) Pub Date : 1999-06-27 DOI: 10.1109/PPC.1999.823804

S. Lam, J. Banister, B. Christensen, R. Schneider, B. Whitton, S. Wong, L. Pressley, S. Seiler

{"title":"Improvement on Double-EAGLE machine synchronization in both negative and positive modes of operation","authors":"S. Lam, J. Banister, B. Christensen, R. Schneider, B. Whitton, S. Wong, L. Pressley, S. Seiler","doi":"10.1109/PPC.1999.823804","DOIUrl":"https://doi.org/10.1109/PPC.1999.823804","url":null,"abstract":"Double-EAGLE has been serving as a reliable user radiation facility for the past 15 years. It is primarily a 2-MV, 4-MA, 85-ns pulse generator driving PRS or diode loads. It can be operated in short- and long-pulse modes for both positive and negative polarities to meet the requirements of the radiation front-end load. In the negative, short pulse mode, the generator delivers more than 4 MA current to the PRS load with a pulsewidth of about 85 ns, and in the long pulse mode, the generator delivers the same amount of current with a pulsewidth of 180 ns. In the positive short pulse mode, Double-EAGLE delivers multi-MA currents and 2 MV voltage into reflex diodes for user radiation. We have made substantial improvements in the reliability of Double-EAGLE by improving the operation of the water switches and the triggered gas switches. The machine can now operate consistently with better than 10 ns synchronization between the two EAGLE modules. We present the Double-EAGLE facility operation data and capability.","PeriodicalId":11209,"journal":{"name":"Digest of Technical Papers. 12th IEEE International Pulsed Power Conference. (Cat. No.99CH36358)","volume":"55 1","pages":"1453-1455 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1999-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79848080","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: 7

Magnetocumulative source of high-power pulses with double inductive energy storage 双感应储能高功率脉冲磁累积源

Digest of Technical Papers. 12th IEEE International Pulsed Power Conference. (Cat. No.99CH36358) Pub Date : 1999-06-27 DOI: 10.1109/PPC.1999.823617

Yu. V. Vilkov, A. Kravchenko, V. Selemir

{"title":"Magnetocumulative source of high-power pulses with double inductive energy storage","authors":"Yu. V. Vilkov, A. Kravchenko, V. Selemir","doi":"10.1109/PPC.1999.823617","DOIUrl":"https://doi.org/10.1109/PPC.1999.823617","url":null,"abstract":"Magneto-cumulative generators are high-power sources of magnetic energy pulses. Duration and shape of the pulses, created by these generators lies in a rather narrow range, which is determined by detonation velocity of the most powerful high explosive substances, used in these generators. Different schemes and device for generator parameters agreement with load parameters are used for formation of current pulses of different shape and duration on a wide load values range. These schemes and devices include inductive coupling of generator contour with load contour, accumulation of magnetic energy, created by MCG and its commutation to the load using breaking units, which use phase transition metal-insulator at conductor temperature increase, current open switches and different types of plasma-erosion open switches. The main purpose of these schemes and devices is to create current pulse of required shape with comparable or higher power value, than developed by MCG, on the load. We describe the source of high-power energy pulses, based on MCG. Transformer energy bending from MCG, breaking units, made of electrically exploding wires, and noncontrollable sharpening discharger are used in this source.","PeriodicalId":11209,"journal":{"name":"Digest of Technical Papers. 12th IEEE International Pulsed Power Conference. (Cat. No.99CH36358)","volume":"8 1","pages":"732-734 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1999-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78246909","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: 1

Study of the mass ratio effect on double gas puff implosion dynamics 双气泡内爆动力学的质量比效应研究

Digest of Technical Papers. 12th IEEE International Pulsed Power Conference. (Cat. No.99CH36358) Pub Date : 1999-06-27 DOI: 10.1109/PPC.1999.823697

R. Baksht, B. Kovalchuk, V. Kokshenev, N. Kurmaev, A. Labetsky, V. Oreshkin, A. Russkikh, A. Fedunin, A. Shishlov

引用次数: 1

Prague Asterix Laser System-a new high power facility 布拉格阿斯特里克斯激光系统-一个新的高功率设备

Digest of Technical Papers. 12th IEEE International Pulsed Power Conference. (Cat. No.99CH36358) Pub Date : 1999-06-27 DOI: 10.1109/PPC.1999.823689

K. Jungwirth, J. Ullschmied, K. Rohlena, B. Rus

引用次数: 1

Comparative study of a relativistic magnetron performance with various cathodes 不同阴极下相对论磁控管性能的比较研究

Digest of Technical Papers. 12th IEEE International Pulsed Power Conference. (Cat. No.99CH36358) Pub Date : 1999-06-27 DOI: 10.1109/PPC.1999.825446

Y. Saveliev, W. Sibbett, S. Spark, B. Kerr, M. I. Harbour, S. C. Douglas

{"title":"Comparative study of a relativistic magnetron performance with various cathodes","authors":"Y. Saveliev, W. Sibbett, S. Spark, B. Kerr, M. I. Harbour, S. C. Douglas","doi":"10.1109/PPC.1999.825446","DOIUrl":"https://doi.org/10.1109/PPC.1999.825446","url":null,"abstract":"Cathode plasma expansion into a vacuum gap is one of the major physical mechanisms affecting the relativistic magnetron (RM) performance and causing a so-called pulse shortening. Therefore, development of new cathode technologies may lead to a significant enhancement of the microwave pulse length, efficiency and power of RMs. The authors are currently conducting a series of experiments with various cathodes with an aim towards improving the RM characteristics. The first results of this research were reported at the BEAMS'98 Conference (Haifa, Israel). In this paper, a more detailed analysis of the experimental data is presented. A primary objective in this research was to determine how the cathode geometry and type of the emission surface would influence major RM characteristics such as microwave pulse duration, output power and magnetron efficiency. The authors found that the cathode geometry influences strongly the RM operation but that the type of emission surface has much less significance. The cathode end caps, which have been mostly abandoned after transition from classical to relativistic magnetrons, were shown to be able to increase the microwave power and RM efficiency without facilitating the pulse shortening effect.","PeriodicalId":11209,"journal":{"name":"Digest of Technical Papers. 12th IEEE International Pulsed Power Conference. (Cat. No.99CH36358)","volume":"41 1","pages":"198-201 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1999-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85720447","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: 1