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Plasma Science, IEEE Transactions on

Issue 3 • Date June 1985

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Displaying Results 1 - 14 of 14
  • Table of contents

    Publication Year: 1985 , Page(s): c1
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    Freely Available from IEEE
  • IEEE Transactions on Plasma Science

    Publication Year: 1985 , Page(s): c2
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  • Wall Effects on the Propagation of Compressional Alfvén Waves in a Cylindrical Plasma with Two-Ion Species

    Publication Year: 1985 , Page(s): 125 - 131
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (978 KB)  

    The dispersion relations for the compressional Alfvén waves in a two-ion species plasma of deuterium and hydrogen are calculated for a configuration which includes a vacuum layer between the cylindrical plasma and the conducting wall. The presence of the vacuum layer strongly affects the propagation of the compressional Alfvén wave, permitting some branches to propagate and penetrate the plasmacolumn over most frequencies in the ion-cyclotron range. Basic Alfvén-wave propagation and heating experiments in two-ion species consequently should be possible using tokamak and mirror devces with minor radii smaller than the Alfvén wavelength. View full abstract»

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  • Experimental Evidence of Charge Separation (Double Layer) in Laser-Produced Plasmas

    Publication Year: 1985 , Page(s): 132 - 134
    Cited by:  Papers (4)
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    Simultaneous measurements of the plasma target potential and plasma charged particle currents have been made for Nd laser irradiances between 4 × 1012 and 1015 W/cm2. The results appear to give the first direct indication of double layers in laser-produced plasmas. View full abstract»

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  • A Cutoff Waveguide ICRF Coupler for Large Tokamaks

    Publication Year: 1985 , Page(s): 135 - 143
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1388 KB)  

    This paper proposes a cutoff waveguide Ion-Cyclotron Range of Frequencies (ICRF) coupler in heatings of fusion plasma for large tokamaks. Structures of tokamaks do not permit enough aperture areas for using cylindrical waveguides in the propagative region. However, if the power source to excite the coupler is located near its aperture, electromagnetic power is expected to pass through the cutoff region as a tunnel effect and radiate into the fusion plasma. We calculate characteristics of the normalized radiation power and the input impedance for this cutoff waveguide coupler, regarding its aperture as a slot. Numerical results show that the cutoff waveguide coupler has a few million watts handling power when the effective dielectric constant of the plasma is between 60 and 100. Experiments for a one-tenth model of actual size are performed using air and water instead of the fusion plasma. Measured input impedance showed a fine agreement with the theory for typical ones. Furthermore, experiments verify that its input impedance can be controlled by the location of a short-circuiting plunger. All these results suggest that the cutoff waveguide coupler is very attractive for ICRF heating. View full abstract»

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  • Measurement of Argon-Density Nonuniformities in Argon-Cesium MHD Plasmas

    Publication Year: 1985 , Page(s): 144 - 148
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    The heavy particle-density nonuniformities correlated with the observed arc structure of closed-cycle magnetohydrodynamic (MHD) generators are measured with a quantitative schlieren technique called the laser-beam deflection method. The experiments are performed with a shock-tube MHD generator working with an atmospheric cesium-seeded argon plasma. The evaluation of argon density and temperature profiles from the experiments is discussed and the results are presented. It is shown that an argon-density nonuniformity is associated with every arc, and that the argon density within the arc is about 25 percent lower than the density outside. View full abstract»

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  • Observations of Neutral Impurity Emission during Operation of Intense Pulsed Ion and Electron Diodes

    Publication Year: 1985 , Page(s): 149 - 152
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (799 KB)  

    The number of neutral particles (N) emitted during the pulsed operation of two magnetically insulated ion diodes and a typical electron diode were measured with an ionization technique. Among the factors that were found to affect the total number of emitted neutrals were the elapsed time between consecutive firings and the power of the voltage pulse. A typical value of N for the electron diode operating at approximately 300 kV and 80 kA was 1019, while values of N for the ion diodes operating in the 90-320 kV range were 3-30 times greater. View full abstract»

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  • Time-Resolved Laser Doppler Measurements in the Underexpanded Jet of a Model Gas-Blast Circuit Breaker under Arcing Conditions

    Publication Year: 1985 , Page(s): 153 - 162
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    A differential laser Doppler system has been used in conjunction with a self-triggered oscillographic raster display system for measuring particle concentrations and flow velocities in a model gas-blast circuit breaker. The flow velocities have been correlated with particle size to enable extrapolation to be made to determine the true plasma flow velocity. The results have been deconvoluted to take account of lateral movements of the arc column. The measurements have been taken with air as the host arcing medium and a flow through a 25-mm-diameter orifice sustained by an upstream pressure of about 7 bar (downstream pressure 1 bar). The arc was sustained by sinusoidal cuffents of peak values 3 and 8 kA and a frequency of 85 Hz. These two currents corresponded to conditions when the model circuit breaker successfully and unsuccessfully interrupted the arc-sustaining current, respectively. The results show that in the case of the 8-kA arc, the flow pattern is severely distorted from that under nonarcing conditions, suggesting that this is a contributory reason for the poorer perfonnance of the model circuit breaker at this higher current level. View full abstract»

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  • Two-Chamber Model for Divertors with Plasma Recycling

    Publication Year: 1985 , Page(s): 163 - 166
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (804 KB)  

    To model particle and heat-loss terms at the edge of a tokamak with a divertor or pumped limiter, a simple two-chamber formuluation of the scrapeoff has been constructed by integrating the fluid equations, including sources, along open field lines. The model is then solved for a wide range of density and temperature conditions in the scrapeoff, using geometrical parameters typical of the poloidal divertor in the poloidal divertor experiment (PDX). The solutions characterize four divertor operating conditions for beam-heated plasmas: plugged, unplugged, blowthrough, and blowback. View full abstract»

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  • Bounds on Instability Growth Rates for Cold Plasmas Streaming along an Infinite Magnetic Guide Field

    Publication Year: 1985 , Page(s): 167 - 170
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    We derive two bounds on growth rates for streaming instabilities of cold plasmas with inhomogeneous density and velocity profiles transverse to a unidirectional infinite magnetic field: 1) a uniform bound which is independent of wavenumber, and 2) a wavenumber-dependent bound which is less than the uniform bound for long wavelengths. Here streaming instabilities include both multistream instabilities in which two or more streams with different velocities overlap in configuration space, and the slipping stream instability in which a stream has a transverse velocity gradient. The bounds obtained are functions of only global steady-state parameters and are useful in bounding growth rates in experimental devices. View full abstract»

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  • Announcing a Special Issue of the IEEE Transactions on Plasma Science on the Physics of RF Discharges for Plasma Processing

    Publication Year: 1985 , Page(s): 171
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    Freely Available from IEEE
  • Announcing a Special Issue of the IEEE Transactions on Plasma Science on Arc Plasmas

    Publication Year: 1985 , Page(s): 172
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    Freely Available from IEEE
  • Information for authors

    Publication Year: 1985 , Page(s): 172a
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    Freely Available from IEEE
  • Affiliate Plan of the IEEE Nuclear and Plasma Sciences Society

    Publication Year: 1985 , Page(s): 172-b
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    Freely Available from IEEE

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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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