Abstract
Argon is being considered as an injected impurity to mitigate damage to divertors of DEMO caused by excessive heat flux. For a comprehensive understanding of Ar plasma, carefully evaluated atomic data are required. In this study, the electron-impact ionization cross-sections and rate coefficients for all atomic ions in the argon isonuclear sequence are calculated using the level-to-level distorted wave approximation. The calculated cross-sections and rate coefficients are compared with experimental data and other theoretical calculations. The calculated values are consistent with results reported in the literature, with differences not exceeding 20%. We fit the calculated cross-sections using an empirical formula. Additionally, we combine our ionization rate coefficients with the dielectronic- and radiative-recombination rate coefficients from other studies to determine the ionization balance. The obtained data are expected to be useful for plasma modelling involving argon impurities.
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