Accessibility to the Lower Hybrid Resonance

AbstractAccessibility of a plane electromagnetic wave into an inhomogeneous, magnetized plasma column is studied using the complete cold plasma dielectric tensor. It is found that TM (transverse magnetic) waves incident at small angles with the vacuum-plasma interface are almost completely transmitted into the plasma even though the criterion for accessibility to the lower-hybrid resonance is not satisfied. The significance of this result for coupling rf energy into plasma filled waveguides is discussed.

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Coupling to the Lower-hybrid Resonance

Zeitschrift für Naturforschung A ◽

10.1515/zna-1973-0908 ◽

1973 ◽

Vol 28 (9) ◽

pp. 1432-1442

Author(s):

S. Puri ◽

M. Tutter

Keyword(s):

Plane Electromagnetic Wave ◽

Grazing Incidence ◽

Transverse Magnetic ◽

Lower Hybrid ◽

Hybrid Layer ◽

Hybrid Resonance ◽

Wide Range ◽

Efficient Coupling ◽

Cyclotron Harmonic ◽

Lower Hybrid Resonance

The transmission coefficient of a plane electromagnetic wave into a cold, inhomogeneous, magnetized, deuterium plasma half-space and its eventual absorption at the lower-hybrid layer is computed numerically for a wide range of parameters. It is found that TM (transverse magnetic) waves incident at small angles with the vacuum-plasma interface couple into the plasma provided that ω/ωci ≲ 20. Assuming that coupling to the lower-hybrid resonance in the cold-plasma approximation is an indication of accessibility to the ion-cyclotron-harmonic waves in the hotplasma case, an alternative statement of the results obtained is that efficient coupling is possible from the second till the twentieth harmonic of the ion gyrofrequency using an antenna that launches TM waves at an approximately grazing incidence on the plasma surface. Simple configurations for coupling rf energy into thermonuclear plasma are suggested.

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Anomalous absorption of electromagnetic wave energy near the lower hybrid resonance

Plasma Physics and Controlled Fusion ◽

10.1088/0741-3335/26/10/006 ◽

1984 ◽

Vol 26 (10) ◽

pp. 1221-1235 ◽

Cited By ~ 8

Author(s):

V N Pavlenko ◽

V G Panchenko ◽

S M Revenchuk

Keyword(s):

Electromagnetic Wave ◽

Wave Energy ◽

Lower Hybrid ◽

Anomalous Absorption ◽

Hybrid Resonance ◽

Lower Hybrid Resonance

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The role of lower hybrid resonance and helicon waves excitations in a magnetized plasma for coating production of complex crystalline structures as hydroxyapatite

Vacuum ◽

10.1016/j.vacuum.2017.10.002 ◽

2017 ◽

Vol 146 ◽

pp. 233-245 ◽

Cited By ~ 2

Author(s):

Elvis O. López ◽

Fábio O. Borges ◽

Alexandre M. Rossi ◽

Ricardo M.O. Galvão ◽

Alexandre Mello

Keyword(s):

Magnetized Plasma ◽

Lower Hybrid ◽

Crystalline Structures ◽

Hybrid Resonance ◽

Helicon Waves ◽

Lower Hybrid Resonance

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Resonance cone structure in a warm inhomogeneous bounded plasma with lower-hybrid resonance layers

Journal of Plasma Physics ◽

10.1017/s0022377800002555 ◽

1985 ◽

Vol 33 (3) ◽

pp. 321-357

Author(s):

Crockett L. Grabbe

Keyword(s):

Cross Sections ◽

General Structure ◽

Asymptotic Methods ◽

Wave Mode ◽

Guided Wave ◽

Magnetized Plasma ◽

Lower Hybrid ◽

Density Region ◽

Hybrid Resonance ◽

Lower Hybrid Resonance

The problem of the wave fields excited by a gap source at the edge of an inhomogeneous, magnetized plasma with a pair of lower-hybrid resonance layers present and bounded by conducting walls is solved. The approach used is that of a solution as a sum of multiply-reflected extraordinary mode and ion-thermal resonance cones as an alternative to the guided-wave mode approach. This is achieved by dividing up the plasma into cross-sections where WKB solutions are valid, and into lower-hybrid resonance layers where asymptotic methods are employed and connexion coefficients between each region are obtained. A diagrammatic scheme for writing the solution is introduced which can in principle be used to write down the solution for any problem of this general type once the connexion coefficients across a resonance layer have been determined via asymptotic analysis. This allows a determination in great detail of the structure and properties of the resonance cones in our model and the way they transform across the back-to-back hybrid layers. Evanescent resonance cones are found to exist in the high-density region between the hybrid resonance layers and tunnel through to the other side, maintaining their general structure if the layer is relatively thin.

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Wave excitation by inhomogeneous suprathermal electron beams

Journal of Plasma Physics ◽

10.1017/s0022377800026386 ◽

1982 ◽

Vol 27 (1) ◽

pp. 69-81 ◽

Cited By ~ 5

Author(s):

H. P. Freund ◽

D. Dillenburg ◽

C. S. Wu

Keyword(s):

Electron Beams ◽

Magnetized Plasma ◽

Velocity Shear ◽

Lower Hybrid ◽

Wave Excitation ◽

Suprathermal Electron ◽

Hybrid Resonance ◽

General Dispersion ◽

Shear Effects ◽

Lower Hybrid Resonance

Wave excitation by an inhomogeneous suprathermal electron beam in a homogeneous magnetized plasma is investigated. Not only is the beam density non-uniform, but the beaming electrons also have a sheared bulk velocity. The general dispersion equation including both electrostatic and electromagnetic effects is derived. Particular attention is paid to the whistler mode. It is found that the density-gradient and velocity-shear effects are important for waves with frequencies close to the lower-hybrid resonance frequency.

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