Renormalized turbulence theory of ion pressure gradient driven drift modes
From the nonlinear gyrokinetic equation we formulate the renormalized turbulence equation for the eta/sub i/ -mode drift wave instability. The study shows that the dominant nonlinear damping mechanism is from the E x B convection of the pressure fluctuation and that the kinetic modifications to the fluid E x B mode coupling, studied earlier, shift the spectrum toward the shorter wavelengths. Balancing the linear growth rate with the nonlinear damping rate at the linearly most unstable region, we calculate the anomalous ion thermal conductivity, which exceeds the neoclassical plateau formula and gives a value of the same order as that previously computed by Horton, Choi, and Tang (Phys. Fluids 26, 1077 (1981)), but with a kinetic enhancement factor. Also, the thermal conductivity formula remains finite for vanishing density gradient.
- Research Organization:
- Department of Physics, Korea Advanced Institute of Science and Technology, P.O. Box 150 Cheongryangni, Seoul, Korea
- DOE Contract Number:
- FG05-80ET53088
- OSTI ID:
- 5919688
- Journal Information:
- Phys. Fluids; (United States), Vol. 29:6
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
PLASMA
DRIFT INSTABILITY
NONLINEAR PROBLEMS
TURBULENCE
ALCATOR DEVICE
COUPLING
DAMPING
FLUCTUATIONS
KINETIC EQUATIONS
OSCILLATION MODES
PLASMA PRESSURE
PRESSURE GRADIENTS
RENORMALIZATION
CLOSED PLASMA DEVICES
EQUATIONS
INSTABILITY
PLASMA INSTABILITY
PLASMA MICROINSTABILITIES
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
VARIATIONS
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