New approach to studying electromagnetic mode coupling in inhomogeneous magnetized plasma

1977 ◽  
Vol 50 (2) ◽  
pp. 361-381 ◽  
Author(s):  
P. C. W. Fung ◽  
F. T. Cheng
Keyword(s):  
Mode Coupling ◽  
Magnetized Plasma ◽  
Electromagnetic Mode ◽  
New Approach

Analysis and design of TEM-TE11 coaxial waveguide bend mode converters

2019 ◽  
Vol 12 (3) ◽  
pp. 198-204 ◽  
Author(s):  
Qiang Zhang ◽  
Xuhao Zhao ◽  
Chengwei Yuan ◽  
Jiande Zhang
Keyword(s):  
Mode Coupling ◽  
Theoretical Calculations ◽  
Coaxial Waveguide ◽  
Coupling Coefficients ◽  
Electromagnetic Mode ◽  
Analysis And Design ◽  
Mode Converters ◽  
Transverse Electromagnetic ◽  
Conversion Efficiencies ◽  
Waveguide Bend

AbstractTwo coaxial waveguide bend mode converters that transform coaxial transverse electromagnetic mode to TE11 coaxial waveguide mode are presented in this paper. Both converters are designed and optimized on the basis of the strictly derived mode coupling coefficients. Conversion efficiencies of both converters are over 99% and the power-handling capacities reach a gigawatt level. The combined dual-bend mode converter is fabricated and tested. The experimental results coincide well with the theoretical calculations and simulations, which demonstrates the feasibility of the designed converter.

scholarly journals Beat Hamiltonians and generalized ponderomotive forces in hot magnetized plasma

1978 ◽  
Vol 20 (3) ◽  
pp. 365-390 ◽  
Author(s):  
Shayne Johnston ◽  
Allan N. Kaufman ◽  
George L. Johnston
Keyword(s):  
Canonical Transformation ◽  
Mode Coupling ◽  
Scalar Potential ◽  
Potential Method ◽  
Magnetized Plasma ◽  
First Order ◽  
Interaction Terms ◽  
Novel Approach ◽  
Ponderomotive Forces ◽  
Nonlinear Mode Coupling

A novel approach to the theory of nonlinear mode coupling in hot magnetized plasma is presented. The formulation retains the conceptual simplicity of the familiar ponderomotive-scalar-potential method, but removes the approximations. The essence of the approach is a canonical transformation of the single-particle Hamiltonian, designed to eliminate those interaction terms which are linear in the fields. The new entity (the ‘oscillation centre’) then has no first-order uttering motion, and generalized ponderomotive forces appear as nonlinear terms in the transformed Hamiltonian. This viewpoint is applied to derive a compact symmetric formula for the general three-wave coupling coefficient in hot uniform magnetized plasma, and to extend the conventional ponderomotive-scalar-potential method to the domain of strongly magnetized plasma.

Pseudo-three-dimensional convective cell motion in a magnetized plasma

1984 ◽  
Vol 31 (2) ◽  
pp. 231-238 ◽  
Author(s):  
P. K. Shukla ◽  
M. Y. Yu
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Mode Coupling ◽  
Three Dimensional ◽  
Convective Cell ◽  
Magnetized Plasma ◽  
Space Plasmas ◽  
Linear And Nonlinear ◽  
Convective Cells ◽  
Cell Motion

Linear and nonlinear mechanisms for generating convective cells with finite but small parallel (to the external magnetic field B0) wavelength are presented. The problems of mode-coupling as well as quasi-steady nonlinear mode structures are analytically studied. Possible applications in space plasmas are discussed.

A new approach to investigating mode coupling phenomena in graded-index optical fibres

1985 ◽  
Vol 17 (3) ◽  
pp. 157-167 ◽  
Author(s):  
M. Calzavara ◽  
R. Caponi ◽  
F. Cisternino ◽  
G. Coppa
Keyword(s):  
Mode Coupling ◽  
Optical Fibres ◽  
New Approach ◽  
Graded Index ◽  
Coupling Phenomena

Dynamics of kink instability in a non-uniform magnetoplasma

1987 ◽  
Vol 38 (2) ◽  
pp. 309-316 ◽  
Author(s):  
R. Bharuthram ◽  
P. K. Shukla
Keyword(s):  
Growth Rate ◽  
Dispersion Relation ◽  
Stationary Solution ◽  
Mode Coupling ◽  
Magnetized Plasma ◽  
Linear Regime ◽  
Electron Current ◽  
Coupling Equations ◽  
Kink Instability ◽  
Nonlinear Fluid

Accounting for an external electron current gradient, a set of nonlinear fluid equations governing the dynamics of kink instability in an inhomogeneous magnetized plasma has been derived. In the linear regime, the dispersion relation is analysed and the variation of the growth rate is graphically shown. In the nonlinear regime, it is shown that a quasi-stationary solution of the mode coupling equations can be represented as a dipolar vortex. Conditions under which the latter arises are given.

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