Charge-Transfer Excitation of Impurity Ions in Tokamaks

Abstract
Detailed studies of spectra from the ISX-A (Impurity Study Experiment) tokamak at the Oak Ridge National Laboratory have shown that certain oxygen-ion lines appear too anomalously intense to have been excited solely by electron collisions. These results are interpreted as being due to charge transfer and suggest the necessity of incorporating this mechanism into analyses of tokamak plasmas.