Proceedings of 1994 IEEE 21st International Conference on Plasma Sciences (ICOPS)最新文献_第8页

High Current, Metal Vapor Vacuum Arc (mevva) Ion Source 高电流，金属蒸气真空电弧(mevva)离子源

Proceedings of 1994 IEEE 21st International Conference on Plasma Sciences (ICOPS) Pub Date : 1994-06-06 DOI: 10.1109/PLASMA.1994.589005

P. Greene, M. Krishnan

{"title":"High Current, Metal Vapor Vacuum Arc (mevva) Ion Source","authors":"P. Greene, M. Krishnan","doi":"10.1109/PLASMA.1994.589005","DOIUrl":"https://doi.org/10.1109/PLASMA.1994.589005","url":null,"abstract":"A Metal Vapor Vacuum Arc (MEVVA) which has been operated at currents from 4 to 68 kA and current densities up to 24 kA/cm{sup 2} is under study at Science Research Laboratory (SRL). The MEVVA plasma is formed by drawing a low-voltage (< 2 kV) arc from a metal cathode to a transparent anode. A dense, highly ionized and nearly current free plasma streams past the anode and is confined and guided in a magnetic field. The SRL MEVVA is under development as a high density (n{sub i} {approximately} 10{sup 16} cm{sup {minus}3}) plasma source for use as imploding loads on high current, z-pinch x-ray simulators. The density of the MEVVA plasma has been measured to be {approximately} 10{sup 15} cm{sup {minus}3} in Ti and Cu ion plasmas with current densities at the cathode of {approximately} 10 kA/cm{sup 2}. Studies of discharges at higher current densities are presently under way. Data presenting the scaling of the ion density and total ion production with the discharge current over a wide range of currents will be presented. As a possible method to increase the plasma density, the effects of guiding the plasma into a converging magnetic nozzle are being studied. The resultsmore » of these experiments will be presented as well as data on the confinement of a non-converging magnetic field.« less","PeriodicalId":254741,"journal":{"name":"Proceedings of 1994 IEEE 21st International Conference on Plasma Sciences (ICOPS)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115144638","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

Frequency Downshift In Rapidly Ionizing Media 快速电离介质中的频率降频

Proceedings of 1994 IEEE 21st International Conference on Plasma Sciences (ICOPS) Pub Date : 1994-06-06 DOI: 10.1109/PLASMA.1994.588960

S. Kuo, A. Ren

{"title":"Frequency Downshift In Rapidly Ionizing Media","authors":"S. Kuo, A. Ren","doi":"10.1109/PLASMA.1994.588960","DOIUrl":"https://doi.org/10.1109/PLASMA.1994.588960","url":null,"abstract":"Recently, theory, computer simulation and experiment have demonstrated that the frequency of an electromagnetic (EM) wave interacting with a rapidly created plasma is upshifted. The interest in frequency upshifting phenomenon can be attributed to its many potential applications including the enhancement of the frequency tuning capability of existing sources of EM waves and improvement of the performance of high-power radar and direct energy systems by enabling reflectionless propagation of very powerful microwave pulses through the air, etc. Moreover, there are no technical difficulties in producing dense plasma rapidly. It was observed, however, that in some experiments a frequency downshift also exists. Since the created plasma decayed much slower than its growth and since the frequency downshift lines did not appear in the results of computer simulations using a lossless unmagnetized plasma model, the frequency downshift phenomenon has not been discussed. In this work, experimental evidence and theory is presented for the simultaneous creation of a downshifted wave. There is excellent agreement between experimental results and computer simulation based on a simple theory.","PeriodicalId":254741,"journal":{"name":"Proceedings of 1994 IEEE 21st International Conference on Plasma Sciences (ICOPS)","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123247465","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

Green's Function Analysis of Free-electron Laser Amplifiers ;nd Oscillators 自由电子激光放大器和振荡器的格林函数分析

Proceedings of 1994 IEEE 21st International Conference on Plasma Sciences (ICOPS) Pub Date : 1994-06-06 DOI: 10.1109/PLASMA.1994.589081

G. Shvets, J. Wurtele

{"title":"Green's Function Analysis of Free-electron Laser Amplifiers ;nd Oscillators","authors":"G. Shvets, J. Wurtele","doi":"10.1109/PLASMA.1994.589081","DOIUrl":"https://doi.org/10.1109/PLASMA.1994.589081","url":null,"abstract":"Theoretical analysis of the free-electron laser Green`s function has been made in two very distinct operating regimes. An analytic expression for the temporal Green`s function has been found for the strongly space-charge dominated (Raman) regime for a single pass FEL amplifier. The expression is shown to reduce to the expected steady-state result when the initial system parameters are time-independent. Frequency shifting is seen to arise from slippage and finite length electromagnetic pulses, as well as from better known causes such as variations in the beam energy and voltage. An explicit criterion for using the local gain approximation is presented. A new formalism for analyzing the temporal and spectral evolution in an oscillator is developed. Variations in both the beam and radiation profiles are included in the analysis. An exact expression for the Green`s function of the n`th pass in an oscillator is derived and can be explicitly evaluated using a fast numerical algorithm. The algorithm yields the n`th pass Green`s function directly, without requiring calculation of the Green`s function at previous passes. The calculation does not involve non-causal truncations utilized in supermode theory.","PeriodicalId":254741,"journal":{"name":"Proceedings of 1994 IEEE 21st International Conference on Plasma Sciences (ICOPS)","volume":"98 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124923513","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

An Overview Of Breakdown Formation Processes In The Transient Hollow Cathode Discharge 瞬态空心阴极放电击穿形成过程综述

Proceedings of 1994 IEEE 21st International Conference on Plasma Sciences (ICOPS) Pub Date : 1994-06-06 DOI: 10.1109/PLASMA.1994.588854

P. Choi, M. Favre, R. Aliaga, H. Chuaqui, Y. Kaufman, J. Moreno, E. Wyndham, M. Zambra

引用次数: 0

Fluid PIC Simulation Of Plasma Processing Devices 等离子体处理装置的流体PIC模拟

Proceedings of 1994 IEEE 21st International Conference on Plasma Sciences (ICOPS) Pub Date : 1994-06-06 DOI: 10.1109/PLASMA.1994.588745

G. Lapenta, J. Brackbill

引用次数: 0

Transport Of Dust Particles In Inductively Coupled Discharges 电感耦合放电中尘埃粒子的输运

Proceedings of 1994 IEEE 21st International Conference on Plasma Sciences (ICOPS) Pub Date : 1994-06-06 DOI: 10.1109/PLASMA.1994.589127

H. Hwang, P. Ventzek, R. Hoekstra, M. J. Kusbner

引用次数: 2

Spin control of The rayleigh-taylor Instability In a dense z-pinch 稠密z-pinch中瑞利-泰勒不稳定性的自旋控制

Proceedings of 1994 IEEE 21st International Conference on Plasma Sciences (ICOPS) Pub Date : 1994-06-06 DOI: 10.1109/PLASMA.1994.588916

G. Peterson, N. Rostoker

引用次数: 0

Two-dimensional Particle Simulations Of The Low Frequency Electric Fields In Ionospheric Injection Experiments 电离层注入实验中低频电场的二维粒子模拟

Proceedings of 1994 IEEE 21st International Conference on Plasma Sciences (ICOPS) Pub Date : 1994-06-06 DOI: 10.1109/PLASMA.1994.588727

O. Bolin, N. Brenning

引用次数: 0

Numerical Modelling Of Ozone Production In A Pulsed Homogeneous Oxygen Discharge 脉冲均匀氧放电中臭氧生成的数值模拟

Proceedings of 1994 IEEE 21st International Conference on Plasma Sciences (ICOPS) Pub Date : 1994-06-06 DOI: 10.1109/PLASMA.1994.588757

J. Nilsson, J.F. Eninger

引用次数: 1

Wave Excitation With Helical Antennas 螺旋天线的波激发

Proceedings of 1994 IEEE 21st International Conference on Plasma Sciences (ICOPS) Pub Date : 1994-06-06 DOI: 10.1109/PLASMA.1994.588747

M. E. Light, F.F. Chen

引用次数: 0