Relativistic radiatively dampedR-matrix calculation of the electron-impact excitation of W46+

The current design plans for the International Thermonuclear Experimental Reactor (ITER) call for tungsten to be employed for certain plasma facing components in the divertor region. Thus, accurate atomic collision data are needed for emission modelling of tungsten. Electron-impact excitation and radiative rates are of particular importance for Ni-like W, since this ion emits some of the most intense spectral lines of all ionization stages. We report on a fully relativistic 115-level R -matrix calculations of W 46+ , which includes the effects of radiation damping. Although radiation damping is very important in most highly ionized species, its effects are reduced in this case because of the closed-shell Ni-like ground state. The rates from these relativistic atomic calculations will be employed for collisional-radiative modelling of this ion.