Modeling of the pellet cloud structure in the presence of ∇B induced drift

Abstract Modeling of the pellet ablation cloud evolution with account of the ∇ B induced drift motion is performed. The model includes acceleration in the low-field-side direction, Alfven conductivity of the background plasma, compensation of ∇ B currents in different parts of the cloud during its propagation along the magnetic field, cloud heating, expansion and ionization and simulation of the pellet ablation rate in a self-consistent manner. The time evolution of density and temperature profiles and the mass deposition after the pellet injection are calculated. The size of neutral part of the cloud, the characteristic values of cloud density and temperature far from the pellet and the fuelling efficiency are in a reasonable agreement with those observed in experiments on ASDEX-Upgrade tokamak.