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IEEE Transactions on Plasma Science

Issue 4 • Date Aug. 1986

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Displaying Results 1 - 25 of 44
  • Table of contents

    Publication Year: 1986, Page(s):c1 - 559-c
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    Freely Available from IEEE
  • IEEE Transactions on Plasma Science

    Publication Year: 1986, Page(s): c2
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  • Special Issue on Arc Plasmas

    Publication Year: 1986, Page(s):289 - 290
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  • What Keeps an Arc Standing in a Cross Flow?

    Publication Year: 1986, Page(s):291 - 299
    Cited by:  Papers (10)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1403 KB)

    An arc exposed to a flow perpendicular to its axis takes on a curved shape. If, however, the electrodes of the arc are moved in a quiet atmosphere, the arc follows the electrodes showing the curved shape as well. Obviously it is just the relative motion between arc and atmosphere that produces a curved arc. Since the flow continues penetrating the arc even in the final curved configuration, the ar... View full abstract»

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  • Radiation Emission Coefficients for Modeling Finite High-Pressure Thermal Plasmas

    Publication Year: 1986, Page(s):300 - 305
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1159 KB)

    A new approach is presented for handling the radiative transfer in high-pressure plasmas where collision broadening dominates the self-absorption spectra. The net radiation leaving a plasma finite-volume element is treated as the difference of two terms: a local net emission term less a second term which represents the absorption from the rest of the discharge medium, a global absorption term. The... View full abstract»

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  • Electrical and Optical Properties of High-Pressure Argon Plasma

    Publication Year: 1986, Page(s):306 - 318
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3287 KB)

    Argon plasma has been investigated in the pressure range p ¿ 200 bar and at temperatures up to 13 000 K. The experiments were performed by using a wall-stabilized arc in an uncooled copper cascade. The measured electrical conductivity agrees with theoretical predictions based on the unified theory. Line and continuous intensities, as well as width and shift of the Ar I line at ¿ = 696.5 nm, were... View full abstract»

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  • Functional dependence of the V-I characterstic of an arc on the thermal parameters

    Publication Year: 1986, Page(s):319 - 324
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (977 KB)

    Numerical and analytical results of a self-consistent analysis of the voltage-current (V-I) characteristic of an electrical discharge are presented. The dependences of the critical current density for the onset of the arc and the peak voltage drop on the exponent n characterizing the dependence of conductivity on temperature are examined. They are found empirically to be proportional to (n - 3/2)-... View full abstract»

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  • Determination of the Partial Pressure of Thallium in High-Pressure Lamp Arcs: A Comparative Study

    Publication Year: 1986, Page(s):325 - 332
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1270 KB)

    The partial pressure of thallium in high-pressure Hg-TlI discharges with different mercury, thallium, and electron pressures has been measured by using the optically thin line Tl 655 nm and the self-reversed line Tl 535 nm. The partial pressure at the arc axis has been measured from the line Tl 655 nm. The effective partial pressure has been measured from the self-reversed line Tl 535 nm on the ba... View full abstract»

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  • Physical Processes in Gas-Tungsten Arcs

    Publication Year: 1986, Page(s):333 - 336
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (767 KB)

    Experiments designed to validate a two-dimensional theoretical model of a gas-tungsten arc welding (GTAW) arc are described. The predicted temperature distributions agree well with the measured values in the body of the arc. Agreement between theory and experiment near the electrodes has been impoved by the new boundary conditions in the theory. Experimental determinations of the effects of gas fl... View full abstract»

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  • Plasma emission mechanism from duoplasmatron hydrogen Arc-theoretical model of the Arc

    Publication Year: 1986, Page(s):337 - 344
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1080 KB)

    The mechanism of plasma emission from the duoplasmatron (DPT) is studied in terms of a model involving a "potential hump" and following the course of an ion (along the magnetic-field lines which are obtained by computational simulation) in moving towards and through the anode nozzle. The analysis of this model indicated the necessity for the "potential hump" in the arc and this corroborated the pl... View full abstract»

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  • Magnetic Control of Diffuse Discharges

    Publication Year: 1986, Page(s):345 - 349
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (935 KB)

    By application of a crossed magnetic field, the electron energy distribution in a gas discharge can be shifted to lower energy values, as demonstrated by means of Monte Carlo calculations for electrons in He:SF6 mixtures. Consequently, through the change in the rate coefficients for ionization and attachment, the sustaining field in the discharge plasma is increased. This magnetically induced volt... View full abstract»

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  • The Dynamic Behavior of Nozzle Arcs

    Publication Year: 1986, Page(s):350 - 356
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1344 KB)

    The dynamic behavior of ac arcs in a supersonic nozzle has been investigated. The close coupling between the arc and its external flow determines the arc characteristics as well as the flow transients within the nozzle in a gas-blast circuit breaker. For affinely related nozzles, the dynamic behavior of the system is found to be fully determined by two nondimensional parameters: the nozzle coeffic... View full abstract»

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  • Synthesis of Ultrafine Silicon Carbide Powders in Thermal Arc Plasmas

    Publication Year: 1986, Page(s):357 - 369
    Cited by:  Papers (22)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3107 KB)

    Ultrafine ß-SiC powders are synthesized in thermal plasmas by a reaction between methane and silicon monoxide. The reaction is carried out in an unconfined plasma jet (22.5 kW) operating at atmospheric Ar pressure. High temperatures (> 10 000 K) combined with ultrarapid quench rates (¿ 106 K/s) of the plasma lead to a high degree of supersaturation of the chemical vapor, resulting in homogeneous... View full abstract»

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  • Application of Thermal Plasma Arc Melting for Critical Alloy Ingot Preparation

    Publication Year: 1986, Page(s):370 - 383
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3209 KB)

    Volatile foreign dependence, cyclic availability, and restricted critical material stockpiles have focused considerable attention on the feasibility of new and more efficient processing/ recycling schemes. Over the past several years United Technologies Research Center (UTRC) has been investigating plasma processing techniques for the reprocessing and upgrading of critical materials and alloys. As... View full abstract»

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  • Theoretical Analysis of Dielectric Recovery in SF6 Gas-Blast Arcs

    Publication Year: 1986, Page(s):384 - 389
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1392 KB)

    The dielectric recovery experiments of Schade and Ragaller [1] in SF6 gas-blast arcs are re-examined in light of the recent temperature calculations of Mitchell et al. [2]. The streamer criterion is used to compute theoretical characteristics for both the reference and enlarged geometries of [1]. It is shown that the theoretical recovery characteristic is relatively insensitive to the computed ste... View full abstract»

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  • Investigations of Nozzle Materials in SF6 Circuit Breakers

    Publication Year: 1986, Page(s):390 - 394
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1070 KB)

    With a puffer and a self-blast type SF6 circuit breaker (CB), various nozzle materials have been investigated. In addition, a small-scaled model SF6 breaker has been attached to a time-of-flight mass spectrometer (TOFMS) in order to study the exhausted gas contaminated with ablated material. The experimental results clearly show an influence of the nozzle material on the interrupting capability of... View full abstract»

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  • Analyses of Axial Energy Distribution in Decaying Arc of SF6 Gas Circuit Breaker

    Publication Year: 1986, Page(s):395 - 401
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1970 KB)

    Adopting a transient arc analyzing program, the authors analyzed the axial distribution of arc characteristics near the current-zero point, proving that while almost all portions of total arc resistance were shouldered in downstream arc, zero conductivity was achieved in the nozzle throat arc. It was also proved that in the presence of transient recovery voltage (TRV) with initial fluctuations, su... View full abstract»

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  • Theoretical and Experimental Investigations of the Flow Field for Asymmetric Dual-Flow Interrupter Nozzles

    Publication Year: 1986, Page(s):402 - 412
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1775 KB)

    Experimental investigations have indicated that electrode vapor can have a significant negative effect in thermal interruption speed for the gas-blast circuit breakers. This electrode vapor contamination can be minimized by the use of asymmetric dual-flow nozzle configuration. A computer program was developed to design the nozzle and electrode geometries of the asymmetric dual-flow interrupter and... View full abstract»

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  • Radiatively Induced Nozzle Ablation in High-Power Circuit Interrupters

    Publication Year: 1986, Page(s):413 - 422
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1669 KB)

    Scientific investigation of nozzle ablation during arcing in gas-blast circuit breakers have hitherto been based solely upon pressure measurements along the length of the nozzle. Although such measurements have provided some insight into the ablation effects, a more detailed understanding requires the measurement of additional parameters. For this reason investigations have been undertaken of the ... View full abstract»

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  • Ablation Controlled Arcs

    Publication Year: 1986, Page(s):423 - 434
    Cited by:  Papers (129)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (5337 KB)

    An experimental and theoretical study on ablation controlled arcs in cylindrical tubes is presented. Measuring techniques for stagnation pressure, electric field strength, mass ablation rate, and arc cross section are described with which a comprehensive set of experimental data is obtained for blackened PTFE as a reference material. These data are interpreted with an isothermal two-zone model tha... View full abstract»

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  • Prediction of Circuit-Breaker Performance Based on a Refined Cybernetic Model

    Publication Year: 1986, Page(s):435 - 443
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1742 KB)

    An improved empirical model for circuit-breaker arcs is presented. The model makes it possible to predict the breaker thermal short-circuit interruption performance within the entire range of practical interest, using only a small number of measurements from synthetic tests of a production SF6 breaker. The procedure is based on the cybernetic model developed by Hochrainer et al. The key improvemen... View full abstract»

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  • Coupled Fluid and Electrodynamic Analysis on MHD Channel with Nonuniform Magnetic Field

    Publication Year: 1986, Page(s):444 - 453
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2178 KB)

    A coupled fluid and electrodynamic computational method is developed to treat nonuniform magnetic field in magnetohydrodynamic (MHD) channel flow analysis. Numerical examples to investigate high current density (¿10 A/cm2) applications including comparisons between uniform and shaped magnetic-field configurations are furnished. The calculated result, using a constant load factor, reveals the poss... View full abstract»

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  • Characterization and Switching Performance of Electron-Beam Controlled Discharges

    Publication Year: 1986, Page(s):454 - 459
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2170 KB)

    The electron-beam sustained discharge switch is an attractive concept for repetitive pulsed power switching because it has a demonstrated capability to interrupt direct current and because it is inherently scalable. We report on experiments with this type of switch in a 4-kV dc circuit. A wire-ion-plasma (WIP) electron-beam (e-beam) gun is used to irradiate and sustain a switch discharge with a 10... View full abstract»

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  • Arc Motion in Vacuum Circuit Breakers

    Publication Year: 1986, Page(s):460 - 463
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (671 KB)

    Arc motion due to self-magnetic fields is investigated theoretically and experimentally. Using an array of four Hall probes 90° apart around a vacuum breaker, we unambiguously determine arc rotation. It is primarily the radio component of magnetic induction that causes this motion. For a particular vacuum breaker design we find that arc rotation is a sensitive function of gap spacing and arc curr... View full abstract»

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  • Pulsed Optical Pumping as a Tool for the Determination of Population Mechanisms of Excited States in a Low-Pressure Mercury Discharge

    Publication Year: 1986, Page(s):464 - 470
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1328 KB)

    Experiments are described in which a low-pressure mercury discharge is irradiated with a dye-laser pulse tuned resonant to one of the 6 3P-7 3S1 mercury transitions. The effects of this optical pumping process are monitored via fluorescence on many mercury transitions. The sign and time behavior of each fluorescence signal are different, and are determined by one or more of the following processes... 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.

 

 

Full Aims & Scope

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
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