Title :
Correlation of H- density and work function of a plasma electrode in H2+alkali (Rb, Cs) plasma
Author :
Nishiura, M. ; Sasao, M. ; Wada, M.
Author_Institution :
Nat. Inst. for Fusion Sci., Gifu, Japan
Abstract :
The work function of the plasma electrode of an H- ion source was measured photoelectrically in H2 plasma, which contains vapor of an alkali metal. The measured work function was correlated with the H- density obtained by a laser photodetachment technique. As the work function of the plasma electrode was reduced due to rubidium injection, the ratio of H- density to electron density, n/ne increased gradually. The n/ne ratio became maximum when the work function reached the minimum value. The same result was obtained in the case of cesium injection
Keywords :
alkali metals; electrodes; hydrogen ions; ion sources; plasma density; plasma diagnostics; work function; H-Cs; H-Rb; H2+ alkali metal plasma; H- density; H- ion source; H2 plasma; alkali metal vapors; cesium injection; electron density; laser photodetachment technique; plasma electrode; rubidium injection; work function; Density measurement; Electrodes; Electrons; Ion sources; Nuclear and plasma sciences; Plasma density; Plasma measurements; Plasma sources; Plasma temperature; Production;
Conference_Titel :
Ion Implantation Technology Proceedings, 1998 International Conference on
Conference_Location :
Kyoto
Print_ISBN :
0-7803-4538-X
DOI :
10.1109/IIT.1999.812117
