Abstract
A 1D theoretical model describing transport of Al impurities in a low temperature He+ plasma is discussed. The model adopts a kinetic approach to describe impurity entrainment in a steady state He+ plasma flow. Results of a 1D Monte Carlo simulation supporting this model are presented and compared to experimental data collected from PISCES-A linear experiment. Both simulation and experimental results confirm that impurities are quickly entrained by the background plasma and quickly acquire its flowing velocity. However, a major discrepancy is observed in the temporal width when comparing the simulation to the experimental Al2+ density profiles downstream the flow. Consideration of several potential effects suggests that background plasma velocity shear is the most likely cause for this discrepancy.
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