Plasma and Fusion Research

Volume 20, 2401012 (2025)

Regular Articles


Influence of Stark Broadening on Ion Temperature Measurement for ITER Divertor Diagnosis
Motoshi GOTO1,2), Kunpei NOJIRI3), Joseph John SIMONS2), Tomoko KAWATE1,2), Tetsutarou OISHI4), Eiichi YATSUKA3), Yuto YANAGIHARA1), Mitsutaka ISOBE1,2) and Yoshihiko NUNOYA3)
1)
National Institute for Fusion Science, Toki 509-5292, Japan
2)
Graduate University for Advanced Studies, SOKENDAI, Toki 509-5292, Japan
3)
Naka Institute for Fusion Science and Technology, National Institutes for Quantum Science and Technology, Naka 311-0193, Japan
4)
Department of Quantum Science and Energy Engineering, Tohoku University, Sendai 980-8579, Japan
(Received 21 August 2024 / Accepted 16 October 2024 / Published 22 January 2025)

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.


Keywords

ITER divertor, ion temperature measurement, beryllium, impurity line, Stark broadening, Zeeman effect

DOI: 10.1585/pfr.20.2401012


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