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Indexed by:期刊论文

Date of Publication:2014-03-01

Journal:PHYSICS OF PLASMAS

Included Journals:SCIE、EI

Volume:21

Issue:3

ISSN No.:1070-664X

Abstract:The process of ion extraction through multiple apertures is investigated using a two-dimensional particle-in-cell code. We consider apertures with a fixed diameter with a hydrogen plasma background, and the trajectories of electrons, H+ and H-2(+) ions in the self-consistently calculated electric field are traced. The focus of this work is the fundamental physics of the ion extraction, and not particular to a specific device. The computed convergence and divergence of the extracted ion beam are analyzed. We find that the extracted ion flux reaching the extraction electrode is non-uniform, and the peak flux positions change according to operational parameters, and do not necessarily match the positions of the apertures in the y-direction. The profile of the ion flux reaching the electrode is mainly affected by the bias voltage and the distance between grid wall and extraction electrode. (C) 2014 AIP Publishing LLC.