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Plasma Science, IEEE Transactions on

Issue 1 • Date Feb. 1990

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Displaying Results 1 - 25 of 26
  • Comments on tired-light mechanisms

    Publication Year: 1990
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (140 KB)  

    The author outlines the observational evidence which the tired-light theories must confront in order to become useful theories. It is shown that if the intervening medium is excluded as the agency for causing excess redshifts, then it is only possible that the intrinsic nature of the object itself could cause the excess redshift. The author has suggested that one parameter, the age of the matter m... View full abstract»

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  • Eigenmodes for electromagnetic waves propagating in a toroidal cavity

    Publication Year: 1990 , Page(s): 78 - 85
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (468 KB)  

    A solution has been attempted by means of the Helmholtz equation for an electromagnetic wave propagating in an empty torus in a system of toroidal coordinates. The electromagnetic fields are expressed in terms of the Hertz vector to obtain a scalar Helmholtz equation. The latter has been solved by making use of an inverse aspect ratio expansion of the solution. Unlike most previous workers, the au... View full abstract»

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  • Nature of convection-stabilized DC arcs in dual-flow nozzle geometry. II. Optical diagnostics and theory

    Publication Year: 1990 , Page(s): 102 - 114
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (840 KB)  

    For pt.I see ibid., vol.18, no.1, p.91-101, 1990. A supersonic flow field with a 5.5-cm-long and ≈2.2-mm-thick cylindrical arc plasma column was observed with a four-mirror Schlieren optical system in dual-flow nozzle geometries. For both the orifice-type nozzle and the two dimensional convergent-divergent nozzle, the arc current was varied from 45 to 110 A. The optical cold-flow-plasma boundar... View full abstract»

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  • Further studies of ELE oscillations during electron-beam firings on Spacelab 1

    Publication Year: 1990 , Page(s): 169 - 170
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (184 KB)  

    Injections from an electron beam that was part of the PICPAB (phenomena induced by charged particle beams) experiment were observed by the SEPAC (space experiments with particle accelerators) plasma diagnostic package. In particular, extremely-low-frequency (ELF) oscillations from 150 to 200 Hz were seen in the SEPAC Langmuir probe current. The strongest oscillations occurred when the ambient pres... View full abstract»

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  • Synchrotron radiation spectrum for galactic-sized plasma filaments

    Publication Year: 1990 , Page(s): 49 - 55
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (580 KB)  

    The radiation spectrum for synchrotron-emitting electrons in galactic-sized Birkeland current filaments is analyzed. It is shown that the number of filaments required to thermalize the emission spectrum to blackbody is not reduced when a non-Maxwellian electron distribution is assumed. If the cosmic background radiation (CBR) spectrum (T=2.76 K) is due to absorption and re-emission of rad... View full abstract»

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  • Smooth plasma-sheath transition in a hydrodynamic model

    Publication Year: 1990 , Page(s): 159 - 168
    Cited by:  Papers (20)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (740 KB)  

    In the hydrodynamic plasma and sheath models, when the two models are treated separately, the use of Bohm's (1949) criterion to obtain boundary conditions at the plasma-sheath interface leads to singularities and discontinuities in some physical quantities. This problem can be overcome by using an appropriate boundary condition; namely, by specifying a particular finite value of the electric field... View full abstract»

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  • Was the Titius-Bode series dictated by the minimum energy states of the generic solar plasma?

    Publication Year: 1990 , Page(s): 73 - 76
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (216 KB)  

    It has been shown previously that the Bode numbers and measured velocity ratios of the planets are accurately predicted by the eigenvalues of the Euler-Lagrange equations resulting from the variation of the free energy of the generic plasma that formed the Sun and planets. This theory is reviewed and extended to show that the equations make accurate predictions for all the major planets out to and... View full abstract»

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  • Transition regions in solar system and astrophysical plasmas

    Publication Year: 1990 , Page(s): 18 - 25
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (936 KB)  

    A brief review is presented of basic particle and field characteristics of plasmas observed within the solar system, especially near transition regions, and their parameter ranges are compared with those inferred for stellar winds and the interstellar medium. Parameter ranges for solar system and astrophysical plasmas are found to have considerable overlap. In addition, astrophysics provides uniqu... View full abstract»

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  • Magnetic fields in spiral galaxies

    Publication Year: 1990 , Page(s): 33 - 37
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1412 KB)  

    Radio polarization observations have revealed large-scale magnetic fields in spiral galaxies. The average total field strength most probably increases with the rate of star formation. The uniform field generally follows the orientation of the optical spiral arms, but is often strongest outside the arms. Long magnetic-field filaments are seen, sometimes up to a 30 kpc length. The field seems to be ... View full abstract»

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  • Cathode erosion rates in vacuum-arc discharges

    Publication Year: 1990 , Page(s): 170 - 171
    Cited by:  Papers (10)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (160 KB)  

    Erosion rates of metal-vapor vacuum-arc cathode materials have been measured for a number of different cathode elements. The measured rates are compared with the rates predicted by a simple estimate based on the known ion generation rates. The agreement is good for the more refractory metals. For the low boiling-point metals there is evidence for an additional mass loss, as, for example, might be ... View full abstract»

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  • Unipolar arc model

    Publication Year: 1990 , Page(s): 127 - 133
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (596 KB)  

    A three-dimensional description of an axisymmetric unipolar arc discharge is given. Both sheath and plasma ball effects are taken into account. The analysis is based on the simultaneous solution of Ohm's law, Maxwell equations, and the boundary conditions for the electric potential at the Plasma-sheath interface. These boundary conditions are dictated by the sheath effects. The potential distribut... View full abstract»

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  • Solitons in a relativistic plasma with negative ions

    Publication Year: 1990 , Page(s): 86 - 90
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (392 KB)  

    The interaction of the nonlinearity and the dispersiveness causing the solitary waves is studied in a relativistic plasma with negative ions through the derivation of a nonlinear partial-differential equation known as the Korteweg-de Vries equation. The negative ions play a salient part in the existence and behavior of the solitons and could be of interest in laboratory plasmas. First, the observa... View full abstract»

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  • Non-Doppler redshift of some galactic objects

    Publication Year: 1990 , Page(s): 56 - 60
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (476 KB)  

    Redshift observations reported in several galactic objects, such as binary stars, star clusters, and in the K effect, are compared with the predicted non-Doppler redshift caused by the inelastic transmission of photons in gases. It is found that all the observations are compatible with the predicted redshift caused by a gas surrounding the star. The new mechanism explains, in a simple way... View full abstract»

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  • Evidence for nonzero mass photons associated with a vacuum-induced dissipative red-shift mechanism

    Publication Year: 1990 , Page(s): 64 - 72
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (732 KB)  

    Laboratory observations that suggest a frequency anisotropy in the direction of the Leo constellation of δν/ν⩾10-6 can be interpreted in terms of a nonzero photon mass m γ≅10-65 g. If one then accepts the theory of light (considered as real Maxwellian waves and photons simultaneously) of Einstein and de Broglie, the experimental... View full abstract»

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  • Excitation of the lower-hybrid resonance at the plasma edge by ICRF couplers

    Publication Year: 1990 , Page(s): 142 - 148
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (456 KB)  

    A simple model is presented and used to examine the inadvertent excitation of the lower-hybrid resonance by fast wave couplers. Loading resistances due to this effect are found to be of the order of 0.1 Ω for present-generation experiments and increase with the toroidal magnetic field. An upper-bound estimate of 1 keV is obtained for the energy transferred to edge ions by the resonance View full abstract»

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  • Ion-acoustic wave propagation in plasmas with ion beams having a finite cross section

    Publication Year: 1990 , Page(s): 149 - 158
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (724 KB)  

    The propagation of a low-density-modulated ion beam with finite cross section in a homogeneous plasma is considered. Analytical expressions describing a Cerenkov-like radiation pattern are obtained. An experimental setup is described that is suitable for investigating these phenomena. The results are in qualitative agreement with the analytical expressions View full abstract»

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  • A terawatt pulse-power generator with a microsecond plasma-opening switch

    Publication Year: 1990 , Page(s): 115 - 118
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (420 KB)  

    A review of the first experiments with the GIT-4 generator is given. GIT-4 is based on the results obtained previously on Gamma (1985) and Marina (1986) generators and has operated since December 1986. GIT-4 is designed to test the concept of a terawatt pulsed-power generator based on the direct charging of an inductive storage from a Marx primary store using a plasma-opening switch (POS) at curre... View full abstract»

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  • The evidence for electrical currents in cosmic plasma

    Publication Year: 1990 , Page(s): 26 - 32
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (552 KB)  

    With the advent of fully three-dimensional, fully electromagnetic, particle-in-cell simulations, investigations of Birkeland currents and magnetic-field-aligned electric fields have become possible in plasmas not accessible to in situ measurement, i.e. in plasmas having the dimensions of galaxies or systems of galaxies. The necessity for a three-dimensional electromagnetic approach derives from th... View full abstract»

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  • Electrodynamics of cosmical plasmas-some basic aspects of cosmological importance

    Publication Year: 1990 , Page(s): 11 - 17
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (596 KB)  

    A review is presented of basic electrodynamic properties as revealed by laboratory and space plasma experiments, and their consequences. They include the coupling between magnetic fields and the motion of matter, filamentary and cellular structure, anomalous momentum coupling, and new mechanisms of chemical separation. It is concluded that some of these properties, obviously important for the unde... View full abstract»

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  • Arc modulator for the TFTR neutral-beam ion source

    Publication Year: 1990 , Page(s): 119 - 126
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (604 KB)  

    A discussion is presented of the protection of the tokamak fusion reactor neutral-beam ion source, located at the Princeton Plasma Physics Laboratory. The system design is based on three operational protection requirements that include provisions for ion-source current pulse matching, ion-source fault current extinction, and metallic fault current extinction. A power circuit configuration satisfyi... View full abstract»

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  • Feed optimization for the slotted line antenna for high-density plasma production

    Publication Year: 1990 , Page(s): 134 - 141
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (668 KB)  

    Investigations on the optimization of feed structures for exciting the slotted line antenna for high-density plasma production are presented. Each feed structure used (except the direct feed) excites a preferred component of the wave electric/magnetic field. It is seen that the efficacy of plasma production using the different feeds depends directly on the relative importance of the field componen... View full abstract»

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  • Prediction of the submillimeter spectrum of the cosmic background radiation by a plasma model

    Publication Year: 1990 , Page(s): 43 - 48
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (516 KB)  

    A non-Big-Bang plasma model is used to predict the submillimeter spectrum of the cosmic background radiation (CBR). Early intermediate-mass stars heat dust which, in turn, warms electrons trapped in force-free filaments emitted by galactic nuclei. Current stars contribute further heating by the same synchrotron mechanism. The electrons emit a nonblackbody radiation which matches the observed CBR s... View full abstract»

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  • Nature of convection-stabilized DC arcs in dual-flow nozzle geometry. I. The cold flow field and DC arc characteristics

    Publication Year: 1990 , Page(s): 91 - 101
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (668 KB)  

    An experimental investigation of the steady-state low current air arcs in a dual-flow nozzle system is presented. The cold flow field with no arc was determined for various nozzle geometries, i.e. two- and three-dimensional and orifice nozzles, and nozzle pressure ratios. Supersonic flow separation and oblique and detached shock waves were observed in the flow field. Using a finite-element compute... View full abstract»

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  • Cosmology in the plasma universe: an introductory exposition

    Publication Year: 1990 , Page(s): 5 - 10
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (536 KB)  

    Acceptance of the plasma universe model is now leading to drastically new views of the structure of the universe. The basic aspects of cosmological importance are: (a) the same basic laws of plasma physics hold everywhere; (b) mapping of electric fields and currents is necessary to understand cosmic plasma; (c) space is filled with a network of currents leading to the cellular and filamentary stru... View full abstract»

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  • Mass determination in galaxies, groups of galaxies, and clusters of galaxies

    Publication Year: 1990 , Page(s): 38 - 42
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (428 KB)  

    Computer simulations of interacting galaxies are used to determine the contribution of halos in disk galaxies. It appears that generally the halo is less massive than the disk. Redshift asymmetries are used to separate binary pairs from optical pairs in catalogs of galaxy pairs. It is found that true binary pairs give a rather low mass for the components. Redshift asymmetries also indicate that gr... 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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Editor-in-Chief
Steven J. Gitomer, Ph.D.
Senior Scientist, US Civilian Research & Development Foundation
Guest Scientist, Los Alamos National Laboratory
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