Invariant relations for the resistively induced plasma flow out of tokamaks under the influence of nonlinear flow terms and ion viscosity

The resistively induced plasma motion across the magnetic surface of a tokamak is considered taking into account nonlinear inertial flow terms and/or ion viscosity. It is shown that certain relations involving the plasma flow F out of the tokamak remain invariant if one goes from flows without these terms to flow including therm. It is concluded that they can affect the flow F only indirectly by rearranging the plasma density, temperature and current distribution. (orig.)