Plasma transport drift equations

The problem of describing a collision-dominated plasma in a strong magnetic field in terms of the transport equations is investigated. It was pointed out earlier that the standard Braginskii-type equations are limited in scope, and various generalizations of these equations to make them applicable to a plasma in a magnetic field with straight force lines were proposed. In contrast, the present authors derive transport equations for an arbitrary magnetic-field geometry, using as a basis a drift kinetic equation with a collision term. The obtained system of transport equations reduces to equations for the density, longitudinal velocity, and temperature for each plasma component. These equations contain the so-called drift fluxes and forces, constituting certain combinations of higher moments. By way of example of the use of the drift transport equations, the problem of plasma rotation in a tokamak is considered. The authors propose that the new transport equations will be found useful also for an analysis of the role of viscosity and thermal conductivity in the instabilities and transport phenomena in a plasma confined by a curvilinear magnetic field