2007 IEEE 34th International Conference on Plasma Science (ICOPS)最新文献_第5页

Study of Effect of Initial Azimuthal Uniformity of the Current Shell on the Operation of Electric-Discharge Chamber with Plasma Focus 电流壳初始方位均匀性对等离子体聚焦放电室运行影响的研究

2007 IEEE 34th International Conference on Plasma Science (ICOPS) Pub Date : 2007-06-17 DOI: 10.1109/PPPS.2007.4345447

A. V. Ivanovsky, G. V. Karpov

{"title":"Study of Effect of Initial Azimuthal Uniformity of the Current Shell on the Operation of Electric-Discharge Chamber with Plasma Focus","authors":"A. V. Ivanovsky, G. V. Karpov","doi":"10.1109/PPPS.2007.4345447","DOIUrl":"https://doi.org/10.1109/PPPS.2007.4345447","url":null,"abstract":"Summary form only given. The paper describe a method of special forming of the azimuthally uniform shell in the vicinity of the cylindrical insulator surface in the electric discharge chamber and will present the results of study of the effect of the preliminary formed shell on the subsequent operation of the chamber. The experiments were carried out with the discharge chamber of Meiser type, with anode diameter of 70 mm and cathode diameter of 120 mm. Electric discharge of the special auxiliary current generator assembled in accordance with a two-stage Marx scheme was used for a preliminary formation of the azimuthally uniform current shell. The initial energy in the capacitors of the auxiliary current generator was ~ 20 J. The capacitor bank with the stored energy of about 150 kJ at the discharge voltage of 35 kV was used as the basic energy source switched after the preliminary formation of the shell. The amplitude of current in the discharge chamber supplied by the main energy source is ~ 1,5 MA. The maximum neutron yield at the chamber filling with pure deuterium is on the order of 1011 neutrons per pulse. It is demonstrated mat the preliminary formation of the current shell with the help of auxiliary generator improves significantly the operation of the discharge chamber. Due to preliminary formation of the azimuthally-uniform shell it became possible to increase several times the operation voltage of deuterium in the discharge chamber and to increase significantly the stability of the neutron yield. The last fact is particularly important when switching from the capacitor storages over to the powerful explosive magnetic energy sources.","PeriodicalId":446230,"journal":{"name":"2007 IEEE 34th International Conference on Plasma Science (ICOPS)","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127585375","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

Academician Sergei D. Korovin: A Shortened Career in High Power Microwaves 谢尔盖·科罗文院士:在高功率微波领域的短暂职业生涯

2007 IEEE 34th International Conference on Plasma Science (ICOPS) Pub Date : 2007-06-17 DOI: 10.1109/PPPS.2007.4345792

G. Mesyats, B. Kovalchuk, N. Ratahin, V. Rostov, V. Shpak, M. Yalandin, E. Schamiloglu

{"title":"Academician Sergei D. Korovin: A Shortened Career in High Power Microwaves","authors":"G. Mesyats, B. Kovalchuk, N. Ratahin, V. Rostov, V. Shpak, M. Yalandin, E. Schamiloglu","doi":"10.1109/PPPS.2007.4345792","DOIUrl":"https://doi.org/10.1109/PPPS.2007.4345792","url":null,"abstract":"Summary form only given. Academician Sergei D. Korovin passed away in January 2006 when he was only 52 years old. He was a leader in high current electronics and an outstanding scientist in high power microwaves. Under Sergei's guidance, high-power relativistic microwave sources in the millimeter, centimeter, and decimeter wavelength bands were developed. Some of them, such as a double-section generator, a Smith-Purcell radiation oscillator, and high-efficiency vircators were realized for the first time. A number of repetitively-pulsed high power microwave sources, including mobile versions for experiments in nanosecond radio-location and for other applications, were created. The accelerators' engineering was essentially developed through new ideas of Sergei Korovin. Among them, the forced circulation of gas in spark gap switches, optimal matching of an accelerator to a load, and most recently the combination of a Tesla transformer with a spiral line was achieved. Since 1996 he supervised the research and development of efficient gigawatt microwave sources which provide for a tunable carrier frequency. Sergei developed the theory of of virtual cathode operation for the optimal interaction of electrons with electromagnetic fields. In 2002 the high efficiency of superradiance was demonstrated experimentally. Finally, he created a strong team at his institute and, in collaboration with other institutes and organizations, this work continues unimpeded today.","PeriodicalId":446230,"journal":{"name":"2007 IEEE 34th International Conference on Plasma Science (ICOPS)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126465998","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

Evolution of Helium DBD at Atmospheric Pressure 大气压下氦DBD的演化

2007 IEEE 34th International Conference on Plasma Science (ICOPS) Pub Date : 2007-06-17 DOI: 10.1109/PPPS.2007.4345619

Haiyun Luo, Xinxin Wang, Zhuo Liang

{"title":"Evolution of Helium DBD at Atmospheric Pressure","authors":"Haiyun Luo, Xinxin Wang, Zhuo Liang","doi":"10.1109/PPPS.2007.4345619","DOIUrl":"https://doi.org/10.1109/PPPS.2007.4345619","url":null,"abstract":"Summary form only given. Dielectric barrier discharge (DBD) of helium at atmospheric pressure was experimentally investigated. The discharge device was powered by a high voltage AC source with a frequency varying from 20 kHz to 50 kHz. Two parallel-plane electrodes are 50 mm in diameter. One electrode was made from aluminium and the other from ITO (indium tin oxide) film that is transparent for taking discharge picture end-on. Both electrodes were covered by one quartz plate which is 120 mm times 120 mm in size and 1 mm in thickness. The gas gap was kept at 5 mm. The applied voltage was measured with a capacitive divider VD305A from Pearson Electronics and the discharge current was obtained by using a current-viewing resistor of 50 ohm. For plotting Lissajous figures, the transported charges during discharge were measured with a capacitor connected in between the ITO electrode and the ground. The evolution of discharge pattern was taken end-on and side-on with an intensified CCD camera (PIMAX2: 1003RB-FG-43 from Princeton Instruments). The time-resolved spectrum from discharge was recorded with a spectrometer (SP-2558 from Acton) coupled to the ICCD camera. The transition from a homogenous glow discharge to a filamentary discharge was observed with the help of fast gated ICCD (exposure time of 10 ns) as the applied voltage or air additive was increased. The roles of He metastable atoms play in getting a homogeneous glow discharge were discussed.","PeriodicalId":446230,"journal":{"name":"2007 IEEE 34th International Conference on Plasma Science (ICOPS)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125616036","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

The Digital Matching Network for a ferromagnetic Inductively Coupled Plasma driven at 400kHz 400kHz驱动铁磁电感耦合等离子体的数字匹配网络

2007 IEEE 34th International Conference on Plasma Science (ICOPS) Pub Date : 2007-06-17 DOI: 10.1109/PPPS.2007.4345867

S. Cho, J. Bang, Y.K. Lee, C. Chung

引用次数: 0

Free Decay of Gas Temperature After Spark Extinction in a Gas Peaking Switch 气体调峰开关火花熄灭后气体温度的自由衰减

2007 IEEE 34th International Conference on Plasma Science (ICOPS) Pub Date : 2007-06-17 DOI: 10.1109/PPPS.2007.4345492

Xinxin Wang, Yuan Hu, Haiyun Luo

{"title":"Free Decay of Gas Temperature After Spark Extinction in a Gas Peaking Switch","authors":"Xinxin Wang, Yuan Hu, Haiyun Luo","doi":"10.1109/PPPS.2007.4345492","DOIUrl":"https://doi.org/10.1109/PPPS.2007.4345492","url":null,"abstract":"Summary form only given. A peaking switch is used to sharpen the rise time on a pulse. Modern gas peaking switches typically operate at gas pressure in the range of 100 arm. and are pulse charged very quickly. Fast gaseous recovery after spark extinction is desired since gas peaking switches are often used in repetitive mode. A model of gaseous recovery in a gas peaking gap was developed. In consideration of the gas neutrality recovery usually occurring in the first few tens of microseconds, very short compared to the gas density recovery, the gaseous recovery was simplified to the gas density recovery that is dependent on the gas temperature decay. The gas temperature decay was numerically simulated with using software ANSYS. The length of spark channel was assumed 1 mm, typical for gas peaking switches. The initial radius of an extinguished spark channel was determined based on the spark theory of a homogenous channel proposed by Branginskii. The initial temperature of the channel was deduced by the Joule heating of the channel before extinction. It was found that the heat flows out from the channel mainly through the electrodes since the short channel was inserted in between two parallel plane electrodes that are relatively big in diameter. The gas temperature of a switch with copper electrodes decays much faster than that with stainless steel. As expected, hydrogen switches recover much faster than nitrogen switches.","PeriodicalId":446230,"journal":{"name":"2007 IEEE 34th International Conference on Plasma Science (ICOPS)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132457892","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

Investigation of Stimulated Raman Scattering using a Short-Pulse Single-Hot-Spot at the Trident Laser Facility 三叉戟激光装置短脉冲单热点受激拉曼散射研究

2007 IEEE 34th International Conference on Plasma Science (ICOPS) Pub Date : 2007-06-17 DOI: 10.1109/PPPS.2007.4346130

J L Kline, D. S. Montgomery, K. Flippo, L. Yin, B. Albright, Randall P. Johnson, T. Shimada, H A Rose, E. A. Williams

引用次数: 1

Nanosize Powders of Zinc Oxide Produced by Electrical Explosion of Zinc Wires 锌丝电爆法制备纳米氧化锌粉体

2007 IEEE 34th International Conference on Plasma Science (ICOPS) Pub Date : 2007-06-17 DOI: 10.1109/PPPS.2007.4345621

Z. Mao, X. Zou, Xiao Liu, Xinxin Wang

{"title":"Nanosize Powders of Zinc Oxide Produced by Electrical Explosion of Zinc Wires","authors":"Z. Mao, X. Zou, Xiao Liu, Xinxin Wang","doi":"10.1109/PPPS.2007.4345621","DOIUrl":"https://doi.org/10.1109/PPPS.2007.4345621","url":null,"abstract":"Nanosize powders of zinc oxide are of potential application in making better varistors for metal oxide arresters. Production of nanosize powders of zinc oxide by electrical explosion of zinc wires in oxygen was experimentally investigated. A pulse current generator was constructed for exploding the wire. The generator is composed of a spark gap switch triggered at a voltage from 10 kV to 40 kV and a capacitor of 2 muF charged to a few tens kilovolts depending on the mass of the wire to be exploded. A discharge chamber for housing the wire was evacuated to a gas pressure below 0.1 torr and then filled with oxygen at pressure in range of 100 torr ~760 torr. One Zn wire (0.2-0.5 mm in diameter, 50-100 mm in length) as the load of the pulse current generator was located in the center of the chamber. A mechanical system was designed to feed the wires without opening the chamber. After 10 wires were exploded, the powders were collected by the evacuation through membrane filter with pore size of 100 nm in diameter. The powders were analyzed by X-ray diffraction, transmission electron microscopy, BET surface area analyzer and laser particle size analyzer. The size of the most powders is found to be smaller than 100 nm.","PeriodicalId":446230,"journal":{"name":"2007 IEEE 34th International Conference on Plasma Science (ICOPS)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134296374","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 and Testing of a Vector Inversion Generator Operating as a RF Oscillator 作为射频振荡器的矢量反转发生器的设计与测试

2007 IEEE 34th International Conference on Plasma Science (ICOPS) Pub Date : 2007-06-17 DOI: 10.1109/PPPS.2007.4345730

Z. Roberts, Z. Shotts, R. Miller, M. Zorn, F. Rose

引用次数: 1

Reliability of Three-Electrode Spark Gaps for Synthetic Test Circuits 合成测试电路中三电极火花隙的可靠性

2007 IEEE 34th International Conference on Plasma Science (ICOPS) Pub Date : 2007-06-17 DOI: 10.1109/PPPS.2007.4346191

P. Osmokrović, M. Pesic, Z. Trifković, A. Vasic

{"title":"Reliability of Three-Electrode Spark Gaps for Synthetic Test Circuits","authors":"P. Osmokrović, M. Pesic, Z. Trifković, A. Vasic","doi":"10.1109/PPPS.2007.4346191","DOIUrl":"https://doi.org/10.1109/PPPS.2007.4346191","url":null,"abstract":"Summary form only given. Development of a three-electrode spark gap, intended for use in synthetic circuits, is considered in this paper. Two types of three-electrode gas insulated spark gaps have been tested: one with the third electrode located inside the main electrode, an the other with a separate third electrode. A theoretical model which enables optimal design of the spark gap has been presented. Application of the model to both types of spark gaps enabled their optimal sizing. The following characteristics have been determined experimentally: the influence of insulating gas parameters on spark gap operation, the influence of the polarity of working and trigger voltages on spark gap operation, the influence of the trigger voltage rate of rise on spark gap operation, and the degree of spark gap irreversibility under conditions of exploitation. Three types of insulating gas have been used: SF6, N2, and a mixture of 60% SF6 with 40% N2 Additionally, three different electrode materials have been implemented: copper, steel and tungsten. Spark gap switching and delay times have been measured as indices of spark gap operation. The statistical analysis of the obtained results is presented in the paper. The testing showed that N? insulated spark gaps have better characteristics than those insulated by SF6, which may be explained by a higher concentration of free electrons in N2 compared to the electronegative SF6. It has been found that that both the switching time and its statistical dispersion increase as the trigger pulse rate of rise becomes higher, while the delay time and its statistical dispersion decreased. Behaviour of the switching time random variable indicated the appearance of irreversible changes in the SF6 insulated spark gap with copper electrodes. Irreversibility of the spark gap was not affected by either the spark gap type or the triggering mode.","PeriodicalId":446230,"journal":{"name":"2007 IEEE 34th International Conference on Plasma Science (ICOPS)","volume":"1155 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134359239","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

Ultimate Kinematic Characteristics of Single-Turn Coil Guns 单转线圈炮的极限运动特性

2007 IEEE 34th International Conference on Plasma Science (ICOPS) Pub Date : 2007-06-17 DOI: 10.1109/PPPS.2007.4346325

S. Stankevich, G. Shvetsov

引用次数: 0