Spectroscopy and atomic physics of highly ionized krypton for tokamak plasmas

Abstract

We present calculations of electron-impact collision strengths and spontaneous radiative decay rates for krypton ions of the Li I through F I isoelectronic sequences for transitions between levels of the 2s22pk, 2s2pk+1, and 2pk+2 configurations. From these atomic data, excitation rate coefficients are calculated, as well as populations of levels within the three configurations mentioned above. The calculations of level populations are carried out at three electron temperatures—2×107, 3×107, and 5×107 K (1.7, 2.6, and 4.4 keV)—which are expected to be typical for future tokamak plasmas.