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Plasma Science, IEEE Transactions on

Issue 1 • Date March 1980

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Displaying Results 1 - 14 of 14
  • [Front cover]

    Page(s): c1
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  • IEEE Transactions on Plasma Science

    Page(s): c2
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  • Table of contents

    Page(s): 1
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  • Thermonuclear Instabilities and Fueling in a Tokamak Reactor

    Page(s): 2 - 9
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    The problem of fueling is of primary importance in the conceptual design of a fusion reactor. We consider a possible mechanism of supplying fresh fuel from a cold-plasma layer at the surface of the plasma. The existence of an energetic component of ions, viz, the alpha particles, may excite unstable collective oscillations of the plasma (called the thermonuclear instabilities). Such instabilities could give rise to microscopic processes which, in principle, would allow influx of fresh fuel while helping efflux of reaction products. A three-regime model is used to understand the nature of such fueling mechanisms and the possibility of using a cold-plasma layer as a surface fueling source. View full abstract»

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  • Ionization and Cohesion in Dense Plasmas

    Page(s): 9 - 14
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    Approximate formulas are derived for the critical density and pressure at which the atoms of hydrogen-like plasmas become ionized due to overlapping of the wave functions. By this mechanism, not only the thermally excited but also the ground state atoms of alkali plasmas become ionized already at moderate pressures. Numerical examples are given for H, Li, Na, K, Rb, and Cs plasmas. It is shown that the (negative) electron-ion interaction energy balances the (positive) thermal energy for sufficiently high electron densities (e.g., n ~ 1020 cm-3 for T ~ 104 K) so that the plasma assumes a cohesive state similar to that of a (liquid) metal. From the quantum effects, the electron exchange energy contributes significantly to this "self-containment" of dense plasmas. View full abstract»

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  • Experimental Studies of Plasma Turbulence, Anisotropic Resistivity, and Particle Diffusion across a Magnetic Field

    Page(s): 14 - 17
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    We have excited ion acoustic turbulence having variable transverse and parallel wave vectors 10-1 View full abstract»

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  • Nonresonant Parametric Decay of a Finite Extent Lower Hybrid Wave

    Page(s): 18 - 21
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    The decay of lower hybrid waves into nonresonant quasimodes inside the lower hybrid resonance cone is observed. Sideband frequency shifts of up to 30 percent from the pump frequency occur. The low-frequency mode is identified as a nonresonant quasi-mode satisfying the approximate conditions ¿/k¿ ¿ ¿e. The sideband wave-number and the sideband and quasi-mode growth rates were measured. The transition between ion-acoustic mode and quasi-mode decay spectra is observed as plasma density or pump frequency is varied. View full abstract»

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  • Evolution of alfvén waves in a stochastic magnetic field-application of khasminskii's theorem

    Page(s): 22 - 25
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    The evolution of Alfvén waves in the presence of a spatially uniform but temporally stochastic magnetic field is considered. Using Stratanovich's method, it is shown that an Alfvén wave is almost surely amplified, if the power spectral density of the magnetic field at twice the wave frequency exceeds a critical value determined by the conductivity of the plasma. Subsequently, a more rigorous and detailed analysis is made using Khasminskii's Theorem. The evolution of the first and the second moments is analyzed. It is shown that the mean wave is actually damped and the second moment is the one which is amplified. Further, it is found that the wave suffers a frequency renormalization. This frequency renormalization is a totally new effect, arising from the more rigorous analysis. The Markovian limit is taken in a more reasonable way. The results reported in the paper are much stronger than the earlier analysis. View full abstract»

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  • Propagation and Attenuation Characteristics of Waveguide Containing Uniaxial Anisotropic Moving Warm Plasma

    Page(s): 26 - 28
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    The propagation, attenuation, cutoff characteristics, and power flow in a rectangular waveguide filled with a relativistically moving collisionless warm plasma for TE (transverse-electric) and TM (transverse-magnetic) modes are investigated in the presence of strong longitudinal magnetic field. The consideration of the attenuation (neglected by previous workers) leads to change in all the propagation characteristics of the waveguide. View full abstract»

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  • Estimation of High Temperature in Air Arc by Integrated Measurement of Emission Coefficients in Concentrated Band Spectrum Radiated from N2+ Molecules

    Page(s): 29 - 32
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    A new spectroscopic method is proposed for measuring high temperature in air arc discharges. The remarkable feature of this method is to measure the integrated emission coefficients of the selected nineteen rotational lines concentrated around the band head of 391.5 nm, which are radiated due to B2¿u+-X2¿g+(0, 0) transition in N2+ molecules. Since the band spectrum is not resolved into an individual line in this method, it is permissible in experiments to use a conventional mono-chromater with a low resolving power. The observed intensity is strong enough to be detected. The temperature dependence of the integrated emission coefficients has a maximum of 8900 K in air at 1 atm, and, therefore, the temperature can be easily estimated from the relative intensity measurement by means of Larenz method. The obtained temperature distributions in the wall-stabilized air arc columns are in good agreements with the theoretically obtained ones. View full abstract»

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  • Analysis and Application of a Transformer Core That Acts as an Arc Snubber

    Page(s): 33 - 38
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    A series of equations is derived from which a transformercore arc snubber can be designed. The theories used to derive these expressions are elaborations of previous studies of pulse-operated transformer cores. Some comparisons between theoretical and experimental results are given. View full abstract»

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  • Correlation of the Radially Integrated Properties of Gas Blast Arc Discharges

    Page(s): 39 - 49
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    Extensive experimental results for the properties of the arc thermal region and local electrical conductances have been reported in the literature for both peak current and current zero phases of orifice air flow arcs. The present paper is concerned with interpreting these results in terms of boundary layer integral analysis concepts. "Characteristic area" and "shape factor" values are presented for orifice flow arcs and methods of correlating these parameters for different arcing conditions are examined. The results show that within experimental accuracy unique relationships exist between various shape factors and correlation parameters, over a wide range of arcing conditions including the current zero period of an ac waveform. The resulting correlation curves, therefore, form the basis for predictive calculations of arc behavior under different gas blast conditions. Finally, an illustration is presented of the manner in which the shape factor correlations may be used for determining the relative importance of various fundamental processes during the current zero period of a gas blast circuit breaker arc. View full abstract»

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  • IEEE copyright form

    Page(s): 49-a - 49-b
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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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