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1992 9th International Conference on High-Power Particle Beams最新文献

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Research on a 1.3 GHz annular electron beam powered multi-gigawatt microwave amplifier 1.3 GHz环形电子束驱动多吉瓦微波放大器的研究
1992 9th International Conference on High-Power Particle Beams Pub Date : 1992-05-25 DOI: 10.1109/PLASMA.1993.593438
K. Hendricks, W. Fayne, L. Bowers, C. E. Davis, M. Haworth, R. Platt, R. Lemke, M. Clark
{"title":"Research on a 1.3 GHz annular electron beam powered multi-gigawatt microwave amplifier","authors":"K. Hendricks, W. Fayne, L. Bowers, C. E. Davis, M. Haworth, R. Platt, R. Lemke, M. Clark","doi":"10.1109/PLASMA.1993.593438","DOIUrl":"https://doi.org/10.1109/PLASMA.1993.593438","url":null,"abstract":"We have been conducting experiments and computer simulations of annular electron beam powered microwave devices. This work includes the generation of an annular electron beam using the IMP puiser (500 kV, 5 Ω, 300 ns), the modulation of this beam by the Single Cavity Double Gap Modulator and a two cavity klystron-like amplifier, and the extraction or radiation of the microwave power via a Vlasov antenna. We have conducted experiments with two different geometries, one with the annular beam inside the microwave circuit and one with the microwave circuit inside the annular beam. We will present results of computer simulations from the 2-D code MAGIC and experiments for both geometries. We will also present results of simulations and experiments on injecting a magnetron signal into the two cavity klystron-like amplifier via RG-220 50 Ω cable. The MAGIC simulations of the amplifier are compared with the code Superfish to verify that the antenna model of MAGIC establishes the proper mode in the cavity.","PeriodicalId":241775,"journal":{"name":"1992 9th International Conference on High-Power Particle Beams","volume":"84 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127180921","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
Spectroscopic investigations of a Plasma Opening Switch using a novel gaseous plasma source 使用新型气体等离子体源的等离子体开启开关的光谱研究
1992 9th International Conference on High-Power Particle Beams Pub Date : 1992-05-25 DOI: 10.1109/PLASMA.1992.697977
M. Sarfaty, Y. Krasik, R. Arad, A. Weingarten, S. Shkolnikova, Y. Maron, A. Fisher
{"title":"Spectroscopic investigations of a Plasma Opening Switch using a novel gaseous plasma source","authors":"M. Sarfaty, Y. Krasik, R. Arad, A. Weingarten, S. Shkolnikova, Y. Maron, A. Fisher","doi":"10.1109/PLASMA.1992.697977","DOIUrl":"https://doi.org/10.1109/PLASMA.1992.697977","url":null,"abstract":"A novel gaseous plasma gun (PG) was developed for spectroscopic investigations of the plasma behavior in a cylindrical Plasma Opening Switch (POS) in the nanosecond time regime. The PG injects the plasma radially outward from inside the high-voltage inner conductor to fill the region between the two conductors. The PG uniformity, reproducibility, electron density and temperature, and plasma flow velocity were determined using floating probes, biased charge collectors, fast photography, and spectroscopic methods. The POS operation was examined for various plasma parameters for a positive polarity of the inner conductor. Eight B loops and two Rogowski coils were used to measure the upstream and downstream currents. Ion current flowing during the switch operation from the plasma through the cathode was measured by two arrays of four collimated Faraday cups placed on two opposite sides of the plasma switch. Spectroscopic observations of high spatial and spectral resolutions of various particle velocities in the plasma were made. Excited level populations, velocity distributions, and directed velocities for various ions are discussed. Measurements of a secondary plasma originating from both electrodes are presented.","PeriodicalId":241775,"journal":{"name":"1992 9th International Conference on High-Power Particle Beams","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129275016","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
Theory of relativistic Backward Wave Oscillators operating near cutoff 近截止运行的相对论反向波振子理论
1992 9th International Conference on High-Power Particle Beams Pub Date : 1992-05-25 DOI: 10.1063/1.870818
S. Miller, T. Antonsen, B. Levush, A. Bromborsky
{"title":"Theory of relativistic Backward Wave Oscillators operating near cutoff","authors":"S. Miller, T. Antonsen, B. Levush, A. Bromborsky","doi":"10.1063/1.870818","DOIUrl":"https://doi.org/10.1063/1.870818","url":null,"abstract":"Backward-Wave Oscillators utilize a high-current electron beam to produce high-power, coherent radiation in the centimeter and millimeter wavelength regime. Under certain voltage and beam current operating conditions, a Backward-Wave Oscillator (BWO) can operate near the upper edge of the transmission band where the group velocity of the electromagnetic wave goes to zero. In this regime, the cold structure dispersion relation can be approximated as a quadratic function of the wavenumber. A theoretical model similar to those presented in [1-3] has been developed to describe the operation of the device in this regime. We solve a self-consistent set of equations to describe the slow evolution of the envelope of the radiation field and the relativistic motion of the particles along a strong magnetic field. Included in the theoretical model are the effects of D.C. and A.C. space charge, and velocity spread in the beam. Numerical calculations of the starting current are performed and compared with an analytic expression for the starting current derived by assuming a fixed field profile.","PeriodicalId":241775,"journal":{"name":"1992 9th International Conference on High-Power Particle Beams","volume":"1907 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121403916","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: 35
Dielectric Cherenkov maser as a powerful amplifier with superwide bandwidth 介质切伦科夫脉泽是一种具有超宽带宽的大功率放大器
1992 9th International Conference on High-Power Particle Beams Pub Date : 1992-05-25 DOI: 10.1109/PLASMA.1992.697898
A. S. Shlapakovskii, K. Chirko
{"title":"Dielectric Cherenkov maser as a powerful amplifier with superwide bandwidth","authors":"A. S. Shlapakovskii, K. Chirko","doi":"10.1109/PLASMA.1992.697898","DOIUrl":"https://doi.org/10.1109/PLASMA.1992.697898","url":null,"abstract":"An important feature of dielectric Cherenkov masers (DCM), distinguishing them from other FEL kinds is emphasized. So far practically all DCM experiments were carried out with rather thin dielectric liners or films. Meanwhile, when the coefficient of waveguide filling by the dielectric is not small, the beam wave coupling doesn't depend on frequency, and, hence, superwide bandwidth is possible. The value of bandwidth is significantly determined also by the current and velocity of electron beam. In this context DCM dispersion relations have been analysed: analytically in simplest of total waveguide filling and numerically, for a hollow beam in a wavequide with dielectric liner. It has been shown that maximum value of bandwidth is achieved at a certain optimal value of the beam current for fixed velocity (and vice versa). Numerical results demonstrate the -3 dB bandwidth of 40-50% at a peak gain of 40 dB for usual electron energies (300-600 keV) and beam currents (1-10 kA). Also, an effect of discontinuous gain disappearance at a lower boundary of the band has been found.","PeriodicalId":241775,"journal":{"name":"1992 9th International Conference on High-Power Particle Beams","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132151190","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
High gradient acceleration in a 17 GHz photocathode RF gun 17ghz光电阴极射频枪的高梯度加速度
1992 9th International Conference on High-Power Particle Beams Pub Date : 1992-05-25 DOI: 10.1063/1.44084
S. Chen, B. Danly, J. Gonichon, C. L. Lin, R. Temkin, S. Trotz, J. Wurtele
{"title":"High gradient acceleration in a 17 GHz photocathode RF gun","authors":"S. Chen, B. Danly, J. Gonichon, C. L. Lin, R. Temkin, S. Trotz, J. Wurtele","doi":"10.1063/1.44084","DOIUrl":"https://doi.org/10.1063/1.44084","url":null,"abstract":"A 17 GHz RF acceleration experiment is being constructed at MIT. The goal is to study particle acceleration at high field gradients and to generate high quality electron beams for potential applications in next generation linear colliders and free electron lasers. The peak accelerating gradient in the 1½ cavity RF gun is about 250 MV/m. The expected beam parameters, for operation with a photoemission cathode, are as follows: energy 2 MeV, normalized emittance 0.43 π mm-mrad, energy spread 0.18%, bunch charge 0.1 nC, and bunch length 0.39 Ps. The detailed experimental setup, including RF cavity, RF transport and coupling, vacuum system, laser and timing system are described.","PeriodicalId":241775,"journal":{"name":"1992 9th International Conference on High-Power Particle Beams","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123946881","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: 10
Theory of relativistic backward wave oscillators operating near cyclotron resonance 在回旋加速器共振附近工作的相对论反向波振子理论
1992 9th International Conference on High-Power Particle Beams Pub Date : 1992-05-25 DOI: 10.1063/1.860902
A. Vlasov, G. Nusinovich, B. Levush, A. Bromborsky
{"title":"Theory of relativistic backward wave oscillators operating near cyclotron resonance","authors":"A. Vlasov, G. Nusinovich, B. Levush, A. Bromborsky","doi":"10.1063/1.860902","DOIUrl":"https://doi.org/10.1063/1.860902","url":null,"abstract":"A linear and nonlinear, time dependent self-consistent theory for relativistic backward wave oscillator is developed. In this theory the transverse motion of the electrons is taken into account. Analytical and numerical analysis of the model equations near the cyclotron resonance gives a good estimate for the power drop due to the cyclotron absorption observed in many experiments and predicts an increase in the power under some conditions.","PeriodicalId":241775,"journal":{"name":"1992 9th International Conference on High-Power Particle Beams","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132066020","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: 33
Experimental study of virtual cathode oscillator in uniform magnetic field 均匀磁场下虚阴极振荡器的实验研究
1992 9th International Conference on High-Power Particle Beams Pub Date : 1992-05-25 DOI: 10.1063/1.107472
K. Kostov, N. Nikolov, I. P. Spasovsky, R. Atanassov
{"title":"Experimental study of virtual cathode oscillator in uniform magnetic field","authors":"K. Kostov, N. Nikolov, I. P. Spasovsky, R. Atanassov","doi":"10.1063/1.107472","DOIUrl":"https://doi.org/10.1063/1.107472","url":null,"abstract":"High-frequency high-power microwave radiations by a virtual cathode oscillator have been obtained. We performed experiments using 350 kV. 7 kA, 30 ns electron beam. A virtual cathode forms when the magnetized relativistic electron beam is injected into circular waveguide. The microwave generation exists in wide range of magnetic field magnitudes (2 kGs-40 kGs). The measured peak microwave power is about 15 MW at frequency region of 11-17 GHz. The radiation frequency has not depend on the magnetic field intensity. A nonsymmetric TM mode is observed. The sources of the microwave emission are both the reflexing electrons and the oscillating virtual cathode.","PeriodicalId":241775,"journal":{"name":"1992 9th International Conference on High-Power Particle Beams","volume":"101 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115769176","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
Electron and ion magnetohydrodynamic effects in plasma opening switches 等离子体开口开关中的电子和离子磁流体动力学效应
1992 9th International Conference on High-Power Particle Beams Pub Date : 1992-05-25 DOI: 10.1109/PLASMA.1993.593452
J. Grossmann, C. De Vore, P. Ottinger
{"title":"Electron and ion magnetohydrodynamic effects in plasma opening switches","authors":"J. Grossmann, C. De Vore, P. Ottinger","doi":"10.1109/PLASMA.1993.593452","DOIUrl":"https://doi.org/10.1109/PLASMA.1993.593452","url":null,"abstract":"Preliminary results are presented of a numerical code designed to investigate electron and ion magnetohydrodynamic effects in plasma erosion opening switches. The present model is one-dimensional and resolves effects such as the J×B deformation of the plasma, and the penetration of magnetic field either by anomalous resistivity or electron magnetohydrodynamics (Hall effect). Comparisons with exact analytic results and experiment are made.","PeriodicalId":241775,"journal":{"name":"1992 9th International Conference on High-Power Particle Beams","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130664286","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
Optical guiding and electron acceleration in the laser wakefield accelerator 激光尾流场加速器中的光导与电子加速
1992 9th International Conference on High-Power Particle Beams Pub Date : 1992-05-25 DOI: 10.1063/1.44068
P. Sprangle, E. Esarey, J. Krall, G. Joyce, A. Ting
{"title":"Optical guiding and electron acceleration in the laser wakefield accelerator","authors":"P. Sprangle, E. Esarey, J. Krall, G. Joyce, A. Ting","doi":"10.1063/1.44068","DOIUrl":"https://doi.org/10.1063/1.44068","url":null,"abstract":"The laser wakefield acceleration concept is studied using a general 2D formulation based on relativistic fluid equations. Simulations of an intense laser pulse propagating in a plasma address both optical guiding and wakefield generation issues. It is shown that relativistic guiding is ineffective in preventing the diffraction of short pulses and long pulses are broken up into beamlet segments due to wakefield effects. The use of preformed plasma density channels or tailored pulse profiles allows intense laser propagation over many Rayleigh lengths. The ponderomotive force associated with the laser pulse envelope generates large amplitude accelerating and focusing wakefields over long distances to achieve electron trapping, acceleration and focusing.","PeriodicalId":241775,"journal":{"name":"1992 9th International Conference on High-Power Particle Beams","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126859341","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
Experiments on generation of High Power Ion Beam in plasma-filled diode 等离子体填充二极管中产生高能离子束的实验研究
1992 9th International Conference on High-Power Particle Beams Pub Date : 1992-05-25 DOI: 10.1017/S0263034600007102
V. Bystritskii, A. Kharlov, G. Mesyats, A. Mytnikov, A. A. Sinebrjukhov
{"title":"Experiments on generation of High Power Ion Beam in plasma-filled diode","authors":"V. Bystritskii, A. Kharlov, G. Mesyats, A. Mytnikov, A. A. Sinebrjukhov","doi":"10.1017/S0263034600007102","DOIUrl":"https://doi.org/10.1017/S0263034600007102","url":null,"abstract":"The experimental results on High Power Ion Beams (HPIB) generation in plasma-filled spherical focusing diode with self magnetic insulation, which was placed for a load at nanosecond accelerator PARUS of 0.2 TW power and 60 ns pulse duration (in matched load case) are given. The regimes of plasma-filled diode operation and generation of ion beam were investigated. For optimal time delay-between the plasma guns pulse and accelerator firing the stable operation in the plasma opening switch mode with power enhancement factor of 2.3 and efficiency of ion beam generation of 20-25% was obtained. The maximal value of the ion current density in the focal plane was reached 15 kA/cm2.","PeriodicalId":241775,"journal":{"name":"1992 9th International Conference on High-Power Particle Beams","volume":"995 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116451188","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
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