Charge-changing collisions of tungsten and its ions with neutral atoms

Abstract

New experimental and theoretical data on charge exchange (CE) cross sections are presented for low-energy collisions (10?500?eV u?1) of W+ and W2 + ions with H, H2 and He atoms. The CE cross sections are calculated using the ARSENY code based on the hidden crossing method. The isotope effect (mass dependence) in collisions of W+ and W2 + ions with hydrogen isotopes H, D, T is studied in the framework of the adiabatic theory of transitions in slow collisions. Furthermore, the electron loss (EL) and CE cross sections for the energy range of 1?105 keV u?1 are calculated for tungsten and its ions Wq + (q = 0?40) colliding with H, He, N, Ar and W atoms using the computer codes (CAPTURE, DEPOSIT and RICODE) based upon the Born approximation and the classical energy-deposition model. The data obtained can be used for plasma modelling, planning and interpretation of future experiments in fusion devices using tungsten as a material for the plasma-facing components.