Link between ablation and line emission for hydrogen fuelling pellet in LHD

E Geulin (1) , B Pégourié (1) , M Goto (2) , G Motojima (2) , R Sakamoto (2) , A Matsuyama (3)

1 IRFM - Institut de Recherche sur la Fusion par confinement Magnétique
2 NIFS - National Institute for Fusion Science
3 QST - National Institutes for Quantum and Radiological Science and Technology

The unambiguous determination of ablation cloudlet characteristics requires the knowledge of calibrated images and spectrum. The model and procedure described here allows to evaluate: - The cloudlet geometry, density and temperature distributions, - The local (i.e. instantaneous) ablation rate, - The relation between line emission (H$\alpha$, H$\beta$ . . . ) and the ablation rate. No strict proportionality is observed between them.

Domaines: Physique [physics]

E Geulin, B Pégourié, M Goto, G Motojima, R Sakamoto, et al.. Link between ablation and line emission for hydrogen fuelling pellet in LHD. EPS 2021 - 47th EPS Conference on Plasma Physics, European physical society, Jun 2021, Virtual conference, France. pp.P2.1045. ⟨cea-03301578⟩