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Plasma Science, IEEE Transactions on

Issue 4 • Date Dec. 1983

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Displaying Results 1 - 16 of 16
  • Table of contents

    Publication Year: 1983 , Page(s): c1
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    Freely Available from IEEE
  • IEEE Transactions on Plasma Science

    Publication Year: 1983 , Page(s): c2
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  • Solitary Surface Waves in Plasmas Interacting with a High-Frequency Electric Field

    Publication Year: 1983 , Page(s): 249 - 250
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    We show that a solitary surface wave can exist at the boundary between a plasma and a dielectric, due to a balance between the nonlinear surface charge terms and the dispersive terms which here are caused by the presence of a high-frequency incident electromagnetic wave. The solitary wave propagation velocity, which depends on the intensity of the incident field, is also calculated. View full abstract»

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  • Experimental Investigation of the Shielding of the Heating Field by the Electrostatic Shield of a Stripline ICRF Antenna

    Publication Year: 1983 , Page(s): 251 - 254
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (899 KB)  

    Measurements of the partial shielding of the current-generated heating field of an electrostatically shielded stripline antenna have been performed. An understanding of this adverse shielding is relevant to optimizing the heating of tokamaks in the ion cyclotron range of frequencies. These measurements verify the predictions of an earlier theoretical study. View full abstract»

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  • A Beam Waveguide Launcher for High Power ECRH Heating in Large Tandem Mirror Machines

    Publication Year: 1983 , Page(s): 255 - 258
    Cited by:  Papers (2)
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    We explore the possibility of applying a quasi-optical beam waveguide of the Cassegrain type as a launching system for RF heating of a fusion plasma. The plane wave required for proper operation of the Cassegrain antenna can be obtained from the azimuthally polarized TE0n gyroton output by means of, e. g., a horn reflector with a stepped-twist reflector mounted in its throat. Our launcher has the potential to keep the loss level extremely low, continue the outputs of a number of gyrotrons, and direct the radiation on the plasma in specific directions and polarization states. View full abstract»

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  • Spatial Investigations of Point-Radiated Fields above the Electron Cyclotron Frequency in an Inhomogeneous Magnetized Plasma

    Publication Year: 1983 , Page(s): 259 - 261
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    Spatial behaviors of mode-converted electron Bernstein waves at the upper hybrid layer in an inhomogeneous magnetized plasma are investigated experimentally and theoretically when the radiated source is located outside the upper hybrid layer. The theoretical spatial field patterns in two dimensions which include the mode-converted cyclotron harmonic wave radiated from a point source are found to be in near accord with the experimental results. View full abstract»

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  • A Comparison of Ray Trajectories in Plasma Characterized by Cold and Warm Dielectric Tensors

    Publication Year: 1983 , Page(s): 261 - 263
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    Ray trajectories are compared in both cold and warm plasmas for temperatures up to 100 keV. The ray paths are almost identical. View full abstract»

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  • Photodetachment as a Control Mechanism for Diffuse Discharge Switches

    Publication Year: 1983 , Page(s): 263 - 265
    Cited by:  Papers (6)
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    Photodetachment is considered as a control mechanism for diffuse discharge switches. Experiments have been performed on photodetachment of ions in the flowing afterglow of a dc glow discharge in oxygen. Experiments with different laser wavelengths and the dependence of the optogalvanic signal on the laser energy flux indicate that O- is the dominant negative ion. For an energy flux of 35 mJ/cm2, 50percent of the O- ions can be photodetached. View full abstract»

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  • Rate Coefficients for Some Collisional Processes in High-Current Hydrogen Discharges

    Publication Year: 1983 , Page(s): 266 - 273
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    Rate coefficients are presented for a number of collisional processes important in high-current hydrogen discharges. The energy distribution of the plasma electrons has been assumed to be Maxwellian. View full abstract»

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  • Rise Time of a Vacuum Gap Triggered by an Exploding Wire

    Publication Year: 1983 , Page(s): 274 - 278
    Cited by:  Papers (2)
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    Detailed investigations on the rise time (tr) of a coaxial vacuum gap, triggered by exploding wire (EW) plasma have been reported for the first time. The tr behavior, studied as a function of energy (Ee) put into EW, exhibits ripples at low gap voltages. At large gap voltages, the ripples disappear resulting in a flat characteristic making tr independent of Ee. This complex tr behavior has been qualitatively explained on the basis of varying proportions between metallic clumps and metallic vapor, and change in the degree of ionization in the EW plasma, as Ee is varied. View full abstract»

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  • The Boundary Layer between Electrodes and a Thermal Plasma

    Publication Year: 1983 , Page(s): 279 - 285
    Cited by:  Papers (4)
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    The electrical boundary layer between an isothermal, weakly ionized plasma and a plane electrode is discussed. Following a formulation of the complete problem, the governing equations are solved in the quasi-neutral continuum approximation to give explicit results for the ionization nonequilibrium layer. This allows three critical current densities to be identified: the first when a cathode must emit electrons; the second at which the anode potential fall changes sign from negative to positive; the third at which the anode must emit ions. The neglected space charge and inertia terms are evaluated to give conditions distinguishing collision-dominated and collisionless sheaths. Using an estimation for the location of the plasma-sheath boundary, the potential falls associated with the ionization nonequilibrium layer are evaluated. The results are illustrated for the case of combustion MHD plasmas. View full abstract»

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  • The Nonlinearity Factors in Analysis of a Conductive Arc Track

    Publication Year: 1983 , Page(s): 285 - 287
    Cited by:  Papers (3)
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    The corrections introduced by an accurate numerical analysis of actual nonlinear thermal conditions in a conductive track under an arc are compared to those for the linear approximation up to the ablation stage. The relevant nonlinearity factors are: the actual arc-current and power distribution, temperature dependences of insulation properties and their stepwise change at the phase transition, and voltage gradient feedback from the track temperature. The plot of temperature distribution in the track shows that the error introduced by the use of a linear approach can be considered as moderate when area of the track which are important for the recovery dielectric strength are considered. View full abstract»

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  • Magnetic Coil Optimization for Quadrupole-Stabilized Mirror Systems

    Publication Year: 1983 , Page(s): 288 - 293
    Cited by:  Papers (1)
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    A numerical technique is presented to optimize the design of quadrupole magnetic coil systems, such as presently used in tandem mirror fusion experiments. The optimization is carried out with respect to various plasma physics properties (e.g., MHD stability and reduced radial transport of particles) which depend on the magnetic field geometry. The coils are treated as filaments of infinitesimal thickness and the magnetic field is computed in the paraxial limit. Constraints on the coil shape and on the magnetic geometry can be incorporated into the method. It is demonstrated that coil solutions can be found which match given paraxial field profiles or which directly minimize a scalar functional of these profiles. As an interesting application of the latter technique, a filamentary coil design for a nearly omnigenous anchor is obtained. View full abstract»

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  • A Tandem Mirror Coil Design to Reduce Radial Losses

    Publication Year: 1983 , Page(s): 294 - 299
    Cited by:  Papers (1)
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    A simple modification of a standard tandem mirror coil design is shown to significantly improve the radial confinement of particles without sacrificing interchange stability. In the new design, the local departure of the particle drift surfaces from the vacuum flux surface is small everywhere, thereby reducing radial particle losses. This is achieved by adjusting the coil parameters to approximate the transport-minimizing magnetic field profiles of Myra et al. near the magnetic axis. Using this technique as a guide, a family of coil configurations is studied. It is shown that reducing the elliptical fanning of the flux surfaces on the inboard side of each quadrupole anchor leads to a great reduction in the radial transport. View full abstract»

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  • A Preshaping Transition Coil for a Small Minimum-B Magnetic Mirror

    Publication Year: 1983 , Page(s): 299 - 300
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    An additional coil between the plasma source and the mirror cell prefans incoming plasma to map it directly into the well-known twisted bow-tie shape and thus avoids reshaping drifts generated in conventional min-B mirror machines. This reduces vacuum chamber size requirements and eliminates any drift reshaping delay. Wound in series with the standard quadrupole loffe bar set, this dual-coil system features end connections which contribute no field on axis. View full abstract»

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  • 1983 Index IEEE Transactions on Plasma Science Vol. PS-11

    Publication Year: 1983 , Page(s): 1 - 5
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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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