Effects of inhomogeneities on the parametric excitation of the upper-hybrid resonance
The effects of the inhomogeneities of the number density and the magnitude of the magnetostatic field on the characteristics of the parametrically excited instability of the extraordinary mode near the upper-hybrid resonant frequency are investigated for the case in which the pump wave and the backscattered idler wave are both ordinary modes. The three interacting waves propagate parallel to a given direction perpendicular to the magnetostatic field whose direction remains unchanged throughout the warm plasma of infinite extent. The parametrically excited instability of the upper-hybrid wave is of the convective or the absolute type according to whether the effective wave number has a linear or a quadratic profile. For both types of instabilities, there are two threshold values for the amplitude of the pump field and they correspond to the requirements for overcoming the damping losses and the convective losses. Numerical results for the various threshold amplitudes are presented as functions of the strength of the magnetostatic field. The inhomogeneities generally increase the various threshold amplitudes as compared to the case of a homogeneous plasma. (AIP)
- Research Organization:
- Department of Electrical and Computer Engineering, The University of Wisconsin, Madison, Wisconsin 53706
- OSTI ID:
- 7364036
- Journal Information:
- J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 47:5; ISSN JAPIA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
700108* -- Fusion Energy-- Plasma Research-- Wave Phenomena
CONVECTIVE INSTABILITIES
DAMPING
ELECTROMAGNETIC RADIATION
ENERGY
ENERGY LOSSES
ENERGY-LEVEL TRANSITIONS
EXCITATION
HYBRID RESONANCE
INHOMOGENEOUS PLASMA
INSTABILITY
MAGNETIC FIELDS
PARAMETRIC INSTABILITIES
PLASMA
PLASMA INSTABILITY
PLASMA MACROINSTABILITIES
RADIATIONS
RESONANCE
THRESHOLD ENERGY
WAVE PROPAGATION