<RESEARCH REPORT>Nonlinear Heat and Particle Transport due to Collisional Drift Waves

概要

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The previous nonlinear analysis of collisional drift waves in an inhomogeneous plasma is extended to include inhomogeneities in electron and ion temperatures. A slab plasma is adopted with the width l in the direction of the density gradient. A systematic expansion in powers of ε= |K| l is used where K is the degree of density (temperature) gradient in equilibrium state. The two-fluid equations are used where the thermal transport is considered besides the ion inertia and the effects of finite gyroradius and viscosity. A set of the model equations is proposed to describe the nonlinear evolution of a collisional drift wave under the presence of the temperature gradients. The nonlinear development of the drift wave is studied near marginal stability on the basis of the model equations. A new feature, hard excitation, has been found which is due to the effect of the nonlinear frequency shift and takes place easily when the ion temperature gradient is present.
核融合科学研究所の論文