Deduction of Mach Numbers with Charge-Exchange and Recombination

Abstract

For the analysis of atomic processes in the divertor-edge plasmas, a new fluid model on the ion collection to a probing object is developed for the magnetized flowing plasmas including electron-ion recombination, molecular activated recombination, charge-exchange and ionization processes. Spatial variations of plasma density and flow velocity along the field lines are calculated, in terms of the normalized shear viscosity, drift flow velocity and ratio of each atomic process to the cross-field transport contribution, by assuming that electrons are governed by the Boltzmann relation, ions are warm, and cross-field diffusion is anomalous. Applications of this theory to the Mach probe data of linear divertor simulators and majors tokamaks will be given along with the impact on the deduction of plasma density by electric probes used in the divertor-edge plasmas.