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IEEE Transactions on Plasma Science

Issue 6 • Date Dec 1992

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Displaying Results 1 - 25 of 67
  • The electrical simulation of a gas discharge excited copper laser

    Publication Year: 1992, Page(s):979 - 987
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (760 KB)

    A circuit model of a gas laser discharge is described for use with simulator packages such as SPICE to describe the behavior of the combined circuit representing a copper vapor laser with its modulator drive. The study treats the laser tube and discharge combination as a transmission line with time-varying impedance elements for which the time variation is achieved by the introduction of controlle... View full abstract»

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  • Equilibrium of intergalactic currents

    Publication Year: 1992, Page(s):891 - 892
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (156 KB)

    The plasma Universe approach to the structure of the Universe considers space to be filled with a network of currents which can undergo pinch compression. The equilibrium structures of such currents are treated in the same way as the structure in laboratory pinches. The difference, for the galactic case, is that gravitational interaction forces between the particles must be included in the analysi... View full abstract»

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  • Excitation of hybrid electrostatic-electromagnetic modes in a plasma-loaded sheath helix

    Publication Year: 1992, Page(s):973 - 978
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (400 KB)

    A plasma-loaded sheath helix supports lower hybrid modes that extended to the outside vacuum region. The phase velocity of the mode is significantly retarded by the presence of the sheath helix, making it liable to excitation by a low-energy electron beam. The extent of the mode outside the plasma is also reduced by the helix. An analysis of lower hybrid mode excitation by a beam propagating in th... View full abstract»

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  • Evolution of particle clouds around ablating pellets in magnetically confined hot plasmas

    Publication Year: 1992, Page(s):663 - 668
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (592 KB)

    Cryogenic hydrogen isotope pellets are being used for introducing fuel particles into the plasma interior in magnetic confinement fusion experiments. The spatial and the time evolution of the initially low-temperature, high-density particle clouds forming around such pellets are considered, with particular attention given to such physical processes as heating of the clouds by the energy fluxes car... View full abstract»

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  • Development of strongly dissipative MHD structures

    Publication Year: 1992, Page(s):882 - 890
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (640 KB)

    The formation of compact magnetic structures by advection of an initial magnetic seed due to the motion of the plasma, and the intensification of the field due to line stretching are discussed. It is shown that when the plasma is squeezed locally by external agents, so that an inflow-outflow near a stagnation point is generated by the pinching, large amounts of Joule heating are obtained in a shor... View full abstract»

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  • Unification of gravity and electromagnetism in the plasma universe

    Publication Year: 1992, Page(s):944 - 957
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1304 KB)

    The basic arguments and results of the gravity-electromagnetism (GEM) theory are presented. This theory unifies gravity and electromagnetism using simple models and concepts and is based on two postulates: (1) gravity is a spatially varying Poynting field that defines the geometry of space such that ultrastrong fields are self-canceling and (2) the splitting or separation of characteristics of gra... View full abstract»

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  • Physics issues associated with low-β plasma generators

    Publication Year: 1992, Page(s):644 - 650
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (620 KB)

    Kinetic aspects of MHD generators are explored by examining the propagation of dense, low-β streams of plasma. Three situations are considered: the basic principles of plasma-stream propagation, the propagation of plasma streams into vacuum, and the propagation of plasma streams into ambient plasmas. These three situations are analogous to plasma generators, plasma generators with vacuum load... View full abstract»

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  • Three fluid transport models by particle-in-cell method for RF glow discharges

    Publication Year: 1992, Page(s):1000 - 1014
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1152 KB)

    Three self-consistent fluid transport models, simulated by the particle-in-cell simulation method (PIC/FE), have been developed for parallel-plate RF glow discharges. The electron transport is modeled by the equilibrium single-moment and nonequilibrium two- and three-moment fluid equations. In the equilibrium single-moment model, the α and γ discharges are underestimated and the nonloc... View full abstract»

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  • Structuring of a plasma shell expanding into a magnetized plasma at sub-Alfvenic speed

    Publication Year: 1992, Page(s):678 - 690
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1056 KB)

    The structuring of plasma shells expanding into a magnetized plasma at velocities less than the Alfven speed is considered. The structuring phenomenon is studied with hybrid simulations. The hybrid simulations are conducted for two characteristic parameter sets: one set representative of magnetized ion experiments and one set representative of unmagnetized ion experiment. A complementary theoretic... View full abstract»

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  • Mathematical models of high-current pulse generators with closing and opening switches

    Publication Year: 1992, Page(s):967 - 972
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (464 KB)

    Simple and effective mathematical models of nonlinear circuit elements of high-current pulse generators are formulated and investigated. The feasibility of the approach is demonstrated by developing a circuit model of the fuse opening switch. The application of these mathematical models to the circuits of different generators is considered. Comparisons between simulation and experimental data are ... View full abstract»

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  • Nonlinear interactions between electrons and RF waves in crossed electric and magnetic fields

    Publication Year: 1992, Page(s):659 - 662
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (348 KB)

    A laboratory experiment has been initiated to study nonlinear electron-wave interactions. In this experiment, the interaction between a guided RF wave and an electron beam is investigated using a large crossed field amplifier. The electron beam is injected through externally imposed crossed electric and magnetic fields. The large-amplitude RF wave is guided by a serpentine slow wave structure and ... View full abstract»

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  • Alfven's programme in solar system physics

    Publication Year: 1992, Page(s):577 - 589
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1448 KB)

    Hannes Alfven's research program in solar system physics provides a valuable case study for the historians and philosophers of science. The response of the scientific community to his remarkable contributions is a severe test of widely held views about how science is or should be done. Seven of those contributions are examined, in the light of two doctrines of scientific methodology, those of Karl... View full abstract»

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  • Electrodynamic forces in stellar formation

    Publication Year: 1992, Page(s):877 - 881
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (528 KB)

    The role of electrodynamic forces in star formation is discussed. Magnetic flux and angular momentum problems in star formation are discussed. It can be shown that ambipolar diffusion is able to solve the magnetic flux problem. It is also shown that Alfven waves create a Lorentz force on the plasma. Rotation of the contracting protostar creates torsional Alfven waves. The created Lorentz force can... View full abstract»

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  • Unification of gravitational, electrical, and strong forces by a virtual plasma theory

    Publication Year: 1992, Page(s):939 - 943
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    It was demonstrated in previous papers that a virtual plasma theory of physical forces unifies all forces as `fluid' or `Magnus' forces generated by vortex structures (particles) in the virtual plasma gas. The theory generates gravitational fields. It generates the electrostatic field in the atom, explains the form and action of the Schrodinger equation, and generates the appropriate Bohr orbits i... View full abstract»

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  • Diagnostics and representation

    Publication Year: 1992, Page(s):636 - 643
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (716 KB)

    The current status of plasma experimental science is reviewed by presenting sets of laboratory configurations and measurement techniques which, when combined, afford reasonably complete control and description of the plasma state. Examples include linear and toroidal plasma research devices; modern diagnostics, with emphasis on high resolution techniques adapted from atomic, laser, and detector ph... View full abstract»

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  • Wave-particle interaction at the plasmasphere-ring current interface

    Publication Year: 1992, Page(s):829 - 832
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    During the plasmasphere filling process following geomagnetic storms, an outward density decrease of the cold plasma at L=3-4 is typically observed. When this structure overlaps with the sharp inner edge of the ring current, wave activity is detected at linearly stable phase velocities. The excitation of these waves around the lower hybrid frequency and their effects on the heating of the... View full abstract»

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  • Second-harmonic generation of laser radiation in a plasma with a density ripple

    Publication Year: 1992, Page(s):996 - 999
    Cited by:  Papers (31)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (260 KB)

    High-power laser radiation with frequency ω1 and wave vector k1zˆ propagating through a plasma at an angle to a density ripple (0,k&oarr;0) produces current and density perturbation at (ω1,k &oarr;1+k&oarr;0). The density perturbation couples with the oscillatory velocity... View full abstract»

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  • A new hypothesis of cosmic ray generation in plasma pinches

    Publication Year: 1992, Page(s):898 - 904
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (600 KB)

    A hypothesis for the birth of galactic cosmic rays in cosmic plasma pinches resulting from neck-type contractions that force plasma to jet outward is presented. It is shown that the accelerated particle energy, E, has a power law dependency dN/dE~ E-s with index s=1+√3=2.732 at the moment of neck breaking or pinch disruption. This value... View full abstract»

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  • Internal dynamics of a plasma propelled across a magnetic field

    Publication Year: 1992, Page(s):672 - 677
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (512 KB)

    When a plasma is pushed across a magnetic field by some nonelectromagnetic force, ions and electrons get turned in opposite directions by the magnetic field. This creates an internal current as well as sheaths at the plasma surfaces and results in an electric field which allows the plasma to maintain some, or even most of its initial momentum in the form of E&oarr;×B&oarr; ... View full abstract»

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  • Cosmological implications of a massive neutrino

    Publication Year: 1992, Page(s):965 - 966
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (196 KB)

    The Alfven cosmic plasma model of the Universe is shown to be consistent with the cosmic background radiation, which is taken to be the radiation from neutrino-antineutrino annihilation. The mass of the neutrino is found to be 6.2×10-4 eV, which is consistent with other experimental observations View full abstract»

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  • Test-ion diffusion in a magnetized plasma

    Publication Year: 1992, Page(s):655 - 658
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (356 KB)

    Cross-field transport of barium test ions is studied in a Q-machine plasma. Test particles are produced and tracked in their motion by an optical tagging method. The comparison between the measured tag signal and a simple theoretical simulation yields an evaluation of the ion diffusivity. Diffusion is supported by classical mechanisms. The injection of different noble buffer gases modifies the pla... View full abstract»

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  • On finite ion Larmor radius MHD equations

    Publication Year: 1992, Page(s):1023 - 1025
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (248 KB)

    The finite ion Larmor radius effects in magnetohydrodynamic equations are formulated without imposing plasma incompressibility. The result is in agreement with the gyrokinetic formulation View full abstract»

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  • Electrostatic waves in the Earth's magnetotail and in comets, and electromagnetic instabilities in the magnetosphere and the solar wind

    Publication Year: 1992, Page(s):843 - 866
    Cited by:  Papers (29)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2392 KB)

    The role of electrostatic ion-beam instabilities in the generation of the broadband electrostatic noise in the Earth's magnetotail and in electrostatic bursts in comets is discussed. The theory of electromagnetic ion-cyclotron instabilities in multicomponent plasmas is reviewed by using the semicold approximation. The method is applied to ring current proton precipitation and to the generation of ... View full abstract»

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  • Fermi acceleration at shock waves and the galactic cosmic ray spectrum: numerical simulations

    Publication Year: 1992, Page(s):909 - 916
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (632 KB)

    A hybrid simulation scheme is applied to treat first-order Fermi acceleration in the neighborhood of shock waves. A steady-state hydrodynamic approximation that describes the shock transition is used to evaluate the evolution in position, phase, and pitch angle of relativistic test particles. The relativistic test particles are followed to obtain the distribution function for a specific time after... View full abstract»

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  • Current loop models for the circumstellar matter in SN 1987A

    Publication Year: 1992, Page(s):874 - 876
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (228 KB)

    Some properties of current-loop models are explored, and some implications are discussed. The elliptical ring observed to be centered on the supernova can be interpreted as light from ions trapped in the magnetic field of a circular current loop. The current is 1.5×10 12 A for a model where gravitational force on 0.03 solar masses of trapped matter balances the electrodynamic expa... View full abstract»

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Aims & Scope

IEEE Transactions on Plasma Sciences focuses on plasma science and engineering, including: magnetofluid dynamics and thermionics; plasma dynamics; gaseous electronics and arc technology.

 

 

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Meet Our Editors

Editor-in-Chief
Steven J. Gitomer, Ph.D.
Senior Scientist, US Civilian Research & Development Foundation
Guest Scientist, Los Alamos National Laboratory
1428 Miracerros Loop South
Santa Fe, NM  87505  87505  USA
tps-editor@ieee.org
Phone:505-988-5751
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