Isotope effect in plasmas driven by ECR modules towards H– and D– production
Résumé
Optimization of negative ion sources operated with deuterium may be limited by the lack of
data on fundamental processes. Insight can be obtained from studies focusing on a direct
comparison of H2 and D2 plasmas. Herein, the ECR volume negative ion source ‘Prometheus I’
operates with both H2 and D2 gases and the properties of the generated plasmas are probed by
means of electrostatic probe and laser induced photo-detachment. A parametric study, involving
pressure and microwave (2.45 GHz) power variation, reveals similar qualitative trends for most
of the plasma properties in both gases. However, quantitively, differences do exist for the plasma
potential, the electron density and temperature, and the negative ion to electron density ratio.
Electron energy distribution functions are thus isotope dependent. Overall, nearly the same
maximal H− and D− negative ion densities are achieved (i.e. 4×109 cm−3). The results are
eventually elucidated with respect to the ECR heating mechanism, and the production and
destruction paths of the negative ions.
Domaines
Plasmas
Fichier principal
Mitrou+et+al_2023_Plasma_Sources_Sci._Technol._10.1088_1361-6595_acfbf5.pdf (1.11 Mo)
Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)