Frequencies of density fluctuation phenomena at the edge of tokamak plasmas are broader than drift wave frequency and thus turbulent.
Extends plasma studies in Tokamaks by realistic parameters in the density gradient, viscosity (responsible for dissipation), ion Landau damping, and resistivity (responsible for instability) in Tokamak edge plasmas.
particle flux is determined by the phase difference between density and potential fluctuations and is proportional to κ (the scale length of the density gradient normalised by ρ_s)
An edge plasma is considered, in which the electron mean free path is shorter than qR (q = safety factor, R = major radius)
It is assumed that the parallel heat conductivity is sufficiently large such that the electrons may be treated as an isothermal fluid along the direction of the magnetic field.