Speaker
Description
All elements from rhenium to platinum will be produced in Tokamaks through neutron-induced transmutation of the tungsten which composed the divertor walls. Therefore, ionic impurities of all possible charge states should appear in the fusion plasma contributing to the power loss which does not make easy to get the self-maintained fusion reactions. However, the radiation emitted by these impurities will be useful for the plasma diagnosis (impurity influx, temperature and density). The identification of the spectral lines in experience and the knowledge of the radiative data for these ions is thus of great interest in this field. This work focuses on calculations of atomic structure, electric dipole transition probabilities and oscillator strengths for isoelectronic elements of Yb I from tantalum to platinum. A new set of electric dipole transitions from Ta IV to Pt IX are determined and listed 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. The results from both methods are compared in order to assess the uncertainty and the quality of the new data.
