ECAMP 15

It is now well established that the ITER Tokamak divertor will be made of tungsten (Z=74). During nuclear fusion operations, the divertor will endure some of the harshest conditions in the reactor. Thus, under neutron bombardment, tungsten will undergo nuclear transmutation, forming other elements, including osmium (Z=76). On the one hand, these impurities will contribute to the radiation losses and, on the other, they could allow to diagnose the fusion plasma in terms of impurity influx, temperature and density. Therefore, knowledge of the radiative data for Os ions is of great interest. The present work is focused on Os VI for which new transition probabilities were determined using two independent methods, namely the pseudo-relativistic Hartree-Fock including core-polarization effects (HFR+CPOL) and the fully relativistic Multiconfiguration Dirac-Hartree-Fock (MCDHF) approaches. This allowed us to provide gA-values for 367 experimentally observed lines in Os VI in the wavelength range between 438.720 and 1486.275 Å, the quality of the new data being assessed through detailed comparisons between the results obtained using both computational approaches.