Atomic data and level populations of highly ionized Ti for tokamak plasmas

Abstract

We present calculations of electron impact collision strengths and spontaneous radiative decay rates for titanium ions of the Li I through F I isoelectronic sequences for transitions between levels of the 2s²2p^k, 2s2p^k+1, and 2p^k+2 configurations. From these atomic data, excitation‐rate coefficients are calculated as well as level populations for the above‐mentioned three configurations. The calculations of level populations include the effects of proton excitation, and are carried out at electron temperatures and densities typical of tokamak plasmas. Wavelengths of forbidden and intersystem lines are given, and a synthetic spectrum is presented for a typical temperature and density.