Effects of inhomogeneities on the parametric excitation of the upper-hybrid resonance

Journal Article · Sat May 01 00:00:00 EDT 1976 · J. Appl. Phys.; (United States)

DOI:https://doi.org/10.1063/1.322906· OSTI ID:7364036

Chan, V S; Seshadri, S R

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), Vol. 47:5
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
INHOMOGENEOUS PLASMA
HYBRID RESONANCE
PLASMA INSTABILITY
PARAMETRIC INSTABILITIES
CONVECTIVE INSTABILITIES
DAMPING
ELECTROMAGNETIC RADIATION
ENERGY LOSSES
EXCITATION
MAGNETIC FIELDS
THRESHOLD ENERGY
WAVE PROPAGATION
ENERGY
ENERGY-LEVEL TRANSITIONS
INSTABILITY
PLASMA
PLASMA MACROINSTABILITIES
RADIATIONS
RESONANCE
700108* - Fusion Energy- Plasma Research- Wave Phenomena