Transport properties of a tokamak plasma with impurities

Transport properties of an impure Tokamak plasma have been investigated for arbitrary charge and mass ratios of the ion species. Using the Fokker-Planck collision term for both like-ion and unlike-ion collisions, the classical transport problem with electric field and pressure and temperature gradient driving forces is solved. Using variational methods, the classical transport coefficients and the ion and impurity distribution functions are determined. These results are used to calculate, again by variational means, neoclassical transport coefficients for the banana-plateau regime. As in the case of a simple plasma, the transport coefficients, which exhibit a gradual transition from banana regime to plateau regime, are fitted to simple functions of the ion and impurity collisionality parameters. Using a moment equation approach, previous results in the Pfirsch-Schluter regime are generalized to arbitrary charge and mass ratios. A simple and efficient FORTRAN subroutine which evaluates the Pfirsch-Schluter transport coefficients is presented. The moment equations for a plasma with one impurity specie are discussed in detail