Influence of Stark Broadening on Ion Temperature Measurement for ITER Divertor Diagnosis

Abstract

The Stark broadening of a Be II line (1s23d 2D – 1s24f 2F, 467.339 nm) under a magnetic field is evaluated with the divertor plasma of ITER in mind. The electron and ion perturbers are treated in the impact and static approximations, respectively. The perturbation term due to the magnetic field is included in the static approximation. The results show that the Stark broadening comes to be significantly large when the density is higher than 1021 m−3, and the ion temperature would be overestimated if the Stark broadening is not taken into account.journal articl