INTRINSIC LOSS AT THE EDGES OF ANISOTROPIC PLASMAS

1963 ◽  
Vol 41 (10) ◽  
pp. 1554-1562 ◽  
Author(s):  
R. A. Hurd
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Field ◽  
Surface Waves ◽  
Static Magnetic Field ◽  
Isotropic Material ◽  
Anisotropic Plasma ◽  
Perfect Conductor ◽  
Metal Interface ◽  
Field Parallel ◽  
Intrinsic Loss

The electromagnetic field near the edge where three sectors meet is investigated. The three sectors are composed of anisotropic plasma, perfect conductor, and isotropic material. With the static magnetic field parallel to the edge, it is found that intrinsic loss occurs at the edge when the frequency lies in a certain range. The loss is found to be closely related to degenerate surface waves at the plasma–metal interface. The conditions under which these waves can exist are investigated. Comparisons are made with the ferrite case which was investigated previously.

Diffraction by a perfectly conducting wedge in an anisotropic plasma

1965 ◽  
Vol 61 (3) ◽  
pp. 767-776 ◽  
Author(s):  
T. R. Faulkner
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Wave ◽  
Difference Equation ◽  
Integral Representation ◽  
Surface Waves ◽  
Uniform Magnetic Field ◽  
Anisotropic Plasma ◽  
Contour Integral ◽  
Anisotropic Dielectric

SummaryThe problem considered is the diffraction of an electromagnetic wave by a perfectly conducting wedge embedded in a plasma on which a uniform magnetic field is impressed. The plasma is assumed to behave as an anisotropic dielectric and the problem is reduced, by employing a contour integral representation for the solution, to solving a difference equation. Surface waves are found to be excited on the wedge and expressions are given for their amplitudes.

THE ABSORPTIVITY SPECTRUM OF A UNIFORM, ANISOTROPIC PLASMA SLAB

1961 ◽  
Vol 39 (9) ◽  
pp. 1273-1290 ◽  
Author(s):  
I. P. French ◽  
G. G. Cloutier ◽  
M. P. Bachynski
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Wave ◽  
Electromagnetic Radiation ◽  
Static Magnetic Field ◽  
Radiation Spectrum ◽  
Collision Frequency ◽  
Anisotropic Plasma ◽  
Electron Collision ◽  
Slab Thickness ◽  
Plasma Slab

Using a generalized formulation of Kirchhoff's law it is possible to relate the equilibrium electromagnetic radiation spectrum of a body to its absorptivity spectrum. The microwave absorptivity of a uniform anisotropic plasma slab to a normally incident electromagnetic wave is obtained by matching fields at the boundaries and is solved completely for the model chosen.The absorptivity spectrum of the plasma slab is computed for waves propagating parallel to and normal to an applied static magnetic field for various electron densities, electron collision frequencies, and slab thicknesses. Peaks in the absorptivity spectrum occur around the edges of the "stop-bands". In general, the absorptivity increases with slab thickness and collision frequency. The effect of internal reflections is included and gives rise to undulations in the absorptivity spectrum.

RADIATION FROM A SOURCE NEAR A PLANE INTERFACE BETWEEN AN ISOTROPIC AND A GYROTROPIC DIELECTRIC

1964 ◽  
Vol 42 (11) ◽  
pp. 2153-2172 ◽  
Author(s):  
S. R. Seshadri ◽  
A. Hessel
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Field ◽  
Surface Waves ◽  
High Frequency ◽  
Free Space ◽  
Line Source ◽  
Low Frequency ◽  
Plane Interface ◽  
Magnetic Current ◽  
Asymptotic Evaluation

The radiation from a line source of magnetic current situated in free space near a plane interface between a semi-infinite free space and a semi-infinite gyrotropic dielectric is investigated for the case in which the gyrotropic axis is parallel to the line source. In addition to the space waves, it is found that in general two unidirectional surface waves are excited along the interface. The dispersion relations for the space and the surface waves are thoroughly examined. Both surface waves have different high-frequency cutoff but no low-frequency cutoff. The characteristics of these surface waves are investigated. An asymptotic evaluation of the total electromagnetic field is carried out for a particularly simple choice of the source frequency. For this frequency, the dependence of the efficiency of excitation of the surface waves on the distance of the source from the interface is determined. The radiation patterns are plotted for various values of the static magnetic field and the position of the source.

scholarly journals Modeling and experiment of slag corrosion on the lightweight alumina refractory with static magnetic field facing green metallurgy

2018 ◽  
Vol 54 (2) ◽  
pp. 143-151 ◽  
Author(s):  
A. Huang ◽  
P. Lian ◽  
L. Fu ◽  
H. Gu ◽  
Y. Zou
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Field ◽  
Corrosion Resistance ◽  
Corrosion Behavior ◽  
Static Magnetic Field ◽  
Steel Production ◽  
High Quality ◽  
Slag Corrosion Resistance ◽  
Alumina Refractory ◽  
Slag Corrosion

Electromagnetic field is applied widely in metallurgy and other high temperature processes, and affects the behavior of melts. The lightweight alumina based carbon free refractory is of importance for energy-saving, consumption reduction and high quality steel production, and the slag corrosion resistance is significant concerning its service life. Does electromagnetic field control the slag corrosion behavior on the lightweight alumina refractory? In this paper, a multi-field coupled model was established to describe the slag corrosion process in an electromagnetic field. The mathematical modeling in combination of experiments was applied to clarify slag corrosion behavior of lightweight alumina refractory in static magnetic field. The simulation results agree with that of the experiments, which means the proposed model is promising for slag corrosion modeling. The results show that the combination of the slag properties change, and electromagnetic damping caused by MHD (magnetohydrodynamics) effect can enhance the slag corrosion resistance by inhibiting slag penetration and promoting formation of a directional isolation layer, and be beneficial to high-quality clean steel production.

Effect of Electromagnetic Field on Microstructure of 5052 Aluminum Alloy Sheet by Roll-Casting

2010 ◽  
Vol 146-147 ◽  
pp. 911-915
Author(s):  
Jin Tao Li ◽  
Guang Ming Xu ◽  
Jian Zhong Cui
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Field ◽  
Aluminum Alloy ◽  
Static Magnetic Field ◽  
Alternating Current ◽  
Alloy Sheet ◽  
Aluminum Alloy Sheet ◽  
Oscillation Effect ◽  
Electromagnetic Oscillation ◽  
Roll Casting

The effect of electromagnetic field on microstructure of roll-casting 5052 aluminum alloy sheet has been investigated and analyzed. The results indicate that imposing static magnetic field can refine the grains of 5052 aluminum alloy during the roll-casting; accordingly, imposing static magnetic field and alternating current at the same time, the grains are remarkably refined and equiaxed due to electromagnetic oscillation effect.

scholarly journals FINITE AND INFINITE H-PLANE BIFURCATION OF A WAVE GUIDE WITH ANISOTROPIC PLASMA MEDIUM

1965 ◽  
Vol 43 (12) ◽  
pp. 2123-2135 ◽  
Author(s):  
S. W. Lee ◽  
Y. T. Lo ◽  
R. Mittra
Keyword(s):  
Magnetic Field ◽  
Static Magnetic Field ◽  
Parallel Plate ◽  
Anisotropic Plasma ◽  
Wave Guide ◽  
Plasma Medium ◽  
Plate Wave ◽  
Complete Field

In this paper, the problem of H-plane bifurcation in a parallel-plate wave guide filled with homogeneous, anisotropic, incompressible plasma is considered. The static magnetic field is assumed to be along the edge of the septum. By using the Wiener–Hopf technique, the complete field solutions are obtained for both semi-infinite and finite bifurcations.

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