Numerical Analysis of the Extraction of Negative Hydrogen Ion in the Extraction Region of Negative Ion Source
Résumé
The optimization of H− extraction from the source is one of the most important issues for developing negative ion sources. The following effects on the total extracted H− current IH− are systematically studied with the 2D3V PIC (Particle in Cell) modeling in a H− volume production source: 1) width of the extraction slit and 2) extraction grid voltage. The PIC modeling results make clear the dependence of IH− on these important parameters. The results also give useful physics understanding about the processes leading to the extraction of H− ions from the source and its optimization.