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Ion-Bernstein wave propagation in tokamak edge plasma during heating in the ion cyclotron range of frequencies

Journal Article · · Phys. Fluids; (United States)
DOI:https://doi.org/10.1063/1.866958· OSTI ID:6789277
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The propagation of a directly launched ion-Bernstein wave is considered in the tokamak edge plasma region in the frequency range ..cap omega../sub i/ <..omega..< 2..cap omega../sub i/, and in the limit of small k/sub perpendicular//sub 0/rho/sub i/. Employing standard perturbation techniques, the wave scattering from a Gaussian spectrum of density fluctuations and the self-modulation resulting from the ponderomotive force nonlinearity are investigated. The results for the typical parameters of the PLT tokamak (Phys. Rev. Lett. 54, 2339 (1985)) and the ALCATOR-C tokamak (Phys. Rev. Lett. 59, 1201 (1987)) indicate that the scattering effect becomes important in the edge region as the fluctuation level is increased from 1% to 30%. Also, it is found that at the power levels currently being used in the experiments, large ponderomotive modifications in the plasma density are produced in the near zone of the launcher. In the weak nonlinearity limit, the ion-Bernstein wave is found to be modulationally unstable, thus implying the possibility of localized heating.
Research Organization:
Department of Electrical and Computer Engineering, University of Wisconsin, Madison, Wisconsin 53706
OSTI ID:
6789277
Journal Information:
Phys. Fluids; (United States), Journal Name: Phys. Fluids; (United States) Vol. 31:10; ISSN PFLDA
Country of Publication:
United States
Language:
English

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Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700101 -- Fusion Energy-- Plasma Research-- Confinement
Heating
&amp; Production
700108* -- Fusion Energy-- Plasma Research-- Wave Phenomena
BERNSTEIN MODE
CLOSED PLASMA DEVICES
END EFFECTS
FLUCTUATIONS
FUNCTIONS
GAUSS FUNCTION
HEATING
HIGH-FREQUENCY HEATING
ICR HEATING
ION WAVES
NONLINEAR PROBLEMS
OSCILLATION MODES
PERTURBATION THEORY
PLASMA
PLASMA DENSITY
PLASMA HEATING
PLASMA WAVES
SCATTERING
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
VARIATIONS
WAVE PROPAGATION