Electron impact single ionization cross sections of W ⁺

Abstract: Tungsten is suitable for wall material as well as divertor material in magnetic fusion devices due to its low sputtering and good thermal properties. The electron impact ionization process in the low charged states of W is important for modeling of the divertors. We present results of our calculation for the electron induced total ionization cross sections of W ⁺. The direct ionization cross sections have been calculated in variants of the binary encounter Bethe methods as well as variants of the distorted wave approximation. The individual cross sections for the direct ionization of some outer subshells of W ⁺ are also reported, and it is observed that the major contribution to the total cross section comes from the 5d, 6s and 4f subshells. Present cross section results have been compared with the available measurements and theoretical results. Graphic Abstract: [Figure not available: see fulltext.]