Negative-Ion-Source Modeling: From Expansion to Extraction Region

Author

Taccogna, Francesco ; Longo, Savino ; Capitelli, Mario ; Schneider, Ralf

Author_Institution

Ist. di Metodologie Inorganiche e dei Plasmi del Consiglio, Naz. delle Ric., Bari

Volume

36

Issue

4

fYear

2008

Firstpage

1589

Lastpage

1599

Abstract

In a negative-ion source, the vibrational kinetics of molecules H₂ and the negative-ion H^- transport are both important in order to understand and optimize H^- extraction. In this paper, two different particle models are developed, simulating the expansion and extraction regions of a radio-frequency inductively coupled plasma negative-ion source. These models show the importance of gas- and plasma-surface interaction in the vibrational excitation of molecules and in the direct production of negative ions from the wall.

Keywords

Monte Carlo methods; Tokamak devices; fusion reactor theory; hydrogen neutral molecules; ion sources; plasma beam injection heating; plasma simulation; plasma sources; plasma transport processes; plasma-wall interactions; vibrational states; H₂; H^-; ITER; NBI heating; direct-simulation Monte Carlo model; expansion region; extraction region; gas-surface interaction; negative-ion transport; neutral beam injection heating; particle models; plasma-surface interaction; radio-frequency inductively coupled plasma negative-ion source; vibrational molecule kinetics; Coils; Electrons; Hydrogen; Magnetic separation; Plasma displays; Plasma simulation; Plasma sources; Plasma transport processes; Production; Radio frequency; Ion source; Monte Carlo methods; modeling;

fLanguage

English

Journal_Title

Plasma Science, IEEE Transactions on

Publisher

ieee

ISSN

0093-3813

Type

jour

DOI

10.1109/TPS.2008.927380

Filename

4599106