Study of plasma meniscus and beam halo in negative ion sources using three dimension in real space and three dimension in velocity space particle in cell model

S. Nishioka, K. Miyamoto, S. Okuda, I. Goto, A. Hatayama, A. Fukano

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Our previous study by two dimension in real space and three dimension in velocity space-particle in cell model shows that the curvature of the plasma meniscus causes the beam halo in the negative ion sources. The negative ions extracted from the periphery of the meniscus are over-focused in the extractor due to the electrostatic lens effect, and consequently become the beam halo. The purpose of this study is to verify this mechanism with the full 3D model. It is shown that the above mechanism is essentially unchanged even in the 3D model, while the fraction of the beam halo is significantly reduced to 6%. This value reasonably agrees with the experimental result.

Original languageEnglish
Article number02A737
JournalReview of Scientific Instruments
Volume85
Issue number2
DOIs
Publication statusPublished - 2014 Feb 1

ASJC Scopus subject areas

  • Instrumentation

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