Proceedings of 1994 IEEE 21st International Conference on Plasma Sciences (ICOPS)最新文献_第7页

Numerical Simulation And experimental Measurement Of pulse generation in coaxial Forming lines 同轴成形线脉冲产生的数值模拟与实验测量

Proceedings of 1994 IEEE 21st International Conference on Plasma Sciences (ICOPS) Pub Date : 1994-06-06 DOI: 10.1109/PLASMA.1994.589070

I. Pegel, L. D. Moreland, A. Roitman, E. Schamiloglu, V. Gubanov, A. Gunin, S. Korovin, V. Rostov, V. Tarakanov

引用次数: 0

Analytic Expressions for emmisions in Sharp Field emitters 尖锐场发射器中发射的解析表达式

Proceedings of 1994 IEEE 21st International Conference on Plasma Sciences (ICOPS) Pub Date : 1994-06-06 DOI: 10.1109/PLASMA.1994.588692

E.G. Zaiclrnan, K. Jensen

引用次数: 0

Experimental Demonstration Of A High-power Slow Wave Electron Cyclotron Maser Utilizing Corrugated Metal Structure 利用波纹金属结构的大功率慢波电子回旋脉泽的实验演示

Proceedings of 1994 IEEE 21st International Conference on Plasma Sciences (ICOPS) Pub Date : 1994-06-06 DOI: 10.1109/PLASMA.1994.589120

K. Minami, K. Ogura, K. Kurashina, W. Kim, T. Watanabe

{"title":"Experimental Demonstration Of A High-power Slow Wave Electron Cyclotron Maser Utilizing Corrugated Metal Structure","authors":"K. Minami, K. Ogura, K. Kurashina, W. Kim, T. Watanabe","doi":"10.1109/PLASMA.1994.589120","DOIUrl":"https://doi.org/10.1109/PLASMA.1994.589120","url":null,"abstract":"High-power microwave (HPM) sources based on electron cyclotron resonance (ECR) such as gyrotrons are fast wave devices and velocity component of electron beam perpendicular to guiding magnetic field is the origin of HPM. HPM sources based on Cherenkove mechanism are slow wave devices and can be driven by a beam without initial perpendicular velocity. The authors present here the experimental result that seems to be the first demonstration of high-power slow wave electron cyclotron maser (ECM) consisting of a large diameter sinusoidally corrugated metal waveguide driven by a beam with predominant parallel velocity. The designed size parameters of slow wave structure (SWS) are as follows: average radius 30 mm, corrugation pitch 3.4 mm, its amplitude h = 1.7 mm and total length 238 mm. They use an annular beam with radius 26.3 mm, energy 55 keV, current 200 A in their experiment. Expected Cherenkov oscillation frequency of TM01 mode is 20 GHz. The observed high-power microwaves can be quantitatively explained by a backward wave oscillation with Cherenkov mechanism enhanced by positive feedback of anomalous Doppler slow cyclotron wave. In conclusion, the slow wave ECM presented here will be a competitive candidate against gyrotrons for generating multi-MW millimeter microwaves available inmore » fusion plasma research.« less","PeriodicalId":254741,"journal":{"name":"Proceedings of 1994 IEEE 21st International Conference on Plasma Sciences (ICOPS)","volume":"137 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":"131455603","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

Plasma Production Using An Asmussen Cavity In A Magnetic Field 磁场中使用阿斯穆森腔产生等离子体

Proceedings of 1994 IEEE 21st International Conference on Plasma Sciences (ICOPS) Pub Date : 1994-06-06 DOI: 10.1109/PLASMA.1994.589006

S. D. De Souza-Machado, J. Curry, F. Skiff

引用次数: 0

Interaction Between Two Electromagnetic Solitary Waves in A Plasma 等离子体中两个电磁孤波的相互作用

Proceedings of 1994 IEEE 21st International Conference on Plasma Sciences (ICOPS) Pub Date : 1994-06-06 DOI: 10.1109/PLASMA.1994.588812

H. H. Kuehl, C.Y. Zhang

引用次数: 4

Stability In Linear, Time-dependent, Fields 线性、时变场的稳定性

Proceedings of 1994 IEEE 21st International Conference on Plasma Sciences (ICOPS) Pub Date : 1994-06-06 DOI: 10.1109/PLASMA.1994.588821

J. Soběhart

引用次数: 0

Spherical Solid Liner Implosion Driven By 4.7 Megajoule Capacitor Discharge 由4.7兆焦耳电容放电驱动的球形固体衬里内爆

Proceedings of 1994 IEEE 21st International Conference on Plasma Sciences (ICOPS) Pub Date : 1994-06-06 DOI: 10.1109/PLASMA.1994.588775

J. Degnan, F. Lehr, D. Bell, A. Chesley, S. Coffey, S. Englert, T. Englert, D. Gale, J. Graham, C. Holmberg, T. Hussey, R. Lewis, C. Outten, R. Peterkin, D. Price, N. Roderick, E. Ruden, U. Shurnlak, G.A. Smith, P. Turchi

引用次数: 0

1- And 2-D Numerical Simulations Of Spherical Pinches 球面挤压的1-和2-D数值模拟

Proceedings of 1994 IEEE 21st International Conference on Plasma Sciences (ICOPS) Pub Date : 1994-06-06 DOI: 10.1109/PLASMA.1994.588780

H. Chen, B. Hilko, J. Chen, E. Panarella

引用次数: 0

Quasi-neutral Particle Simulations Of Magnetized Low Pressure Discharges, 磁化低压放电的准中性粒子模拟

Proceedings of 1994 IEEE 21st International Conference on Plasma Sciences (ICOPS) Pub Date : 1994-06-06 DOI: 10.1109/PLASMA.1994.589046

W. Manheimer, M. Lampe, G. Joyce, S. Slinker

{"title":"Quasi-neutral Particle Simulations Of Magnetized Low Pressure Discharges,","authors":"W. Manheimer, M. Lampe, G. Joyce, S. Slinker","doi":"10.1109/PLASMA.1994.589046","DOIUrl":"https://doi.org/10.1109/PLASMA.1994.589046","url":null,"abstract":"Particle simulations of bulk discharges are constrained by the Debye length scale, which is orders of magnitude less than any other scale length of interest in the bulk plasma. While artificial scaling of the parameters, and nonuniform grid spacing can somewhat alleviate the problem, it still represents a serious constraint. Quasi-neutral fluid and hybrid simulations are routinely done; however in many plasmas on the kinetic nature of both the electrons and ions play important roles. The authors report progress on the development of a quasi-neutral particle simulation for an ECR discharge. The quasi-neutral nature of the plasma means that the algorithms for advancing the ions, electrons and for calculating the electric field are very non-standard. The ions are initially advanced in three dimensions. However very fast time scale, short scale length electrostatic electric fields impose average quasi-neutrality perpendicular to the field. The ion motion in the simulation is slightly corrected to reflect this. Along the field line, quasi-neutrality is maintained by very fast electron oscillations. The electron motion is also slightly corrected to insure quasi-neutrality. Once the particles are convected, the electric field is calculated from the electron momentum equation.","PeriodicalId":254741,"journal":{"name":"Proceedings of 1994 IEEE 21st International Conference on Plasma Sciences (ICOPS)","volume":"25 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":"133034934","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

Study Of Mode Locking In Tapered Cavity Gyrotron Oscillators 锥形腔回旋管振荡器锁模研究

Proceedings of 1994 IEEE 21st International Conference on Plasma Sciences (ICOPS) Pub Date : 1994-06-06 DOI: 10.1109/PLASMA.1994.589083

H. Wu, A. McCurdy

{"title":"Study Of Mode Locking In Tapered Cavity Gyrotron Oscillators","authors":"H. Wu, A. McCurdy","doi":"10.1109/PLASMA.1994.589083","DOIUrl":"https://doi.org/10.1109/PLASMA.1994.589083","url":null,"abstract":"It has been shown via quasilinear theory that a gyrotron oscillator with a highly dispersive waveguide structure can be mode locked by compensating with dispersion due to the electron beam. It is perhaps easier to modify the cavity geometry. A nonlinear investigation of mode locking is carried out using the MAGIC code. A closed, tapered cylindrical cavity gyrotron is used with an operating frequency of 20 GHz. A taper section of 11.25 cm with taper angle of 0.6{degree} is included. The cavity supports azimuthally symmetric TE{sub 01n} modes. The electron beam parameters are 50 kV beam voltage with 10 A beam current, and 0.5 cm guiding center radius. The external axial magnetic field is 7.46 kG. A beam velocity or beam density modulation is imposed on the input electrons to model the effect of a prebunching cavity. In the case of a 5%, 280 MHz density modulation the simulation results show the frequency interval between adjacent modes is almost identical to modulation frequency, indicating locking between adjacent modes. The output radiation consists of a train of narrow pulses (FFWHM {approximately}1 ns) at a 280 MHz repetition rate. An open-end tapered cavity connected to a waveguide is under investigation. Numerical simulationmore » results will be presented and an experimental design will be described.« less","PeriodicalId":254741,"journal":{"name":"Proceedings of 1994 IEEE 21st International Conference on Plasma Sciences (ICOPS)","volume":"95 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":"133803955","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