Effect of Coulomb collision on the negative ion extraction mechanism in negative ion sources

I. Goto, K. Miyamoto, S. Nishioka, S. Mattei, J. Lettry, S. Abe, Akiyoshi Hatayama

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

To improve the H- ion beam optics, it is necessary to understand the energy relaxation process of surface produced H- ions in the extraction region of Cs seeded H- ion sources. Coulomb collisions of charged particles have been introduced to the 2D3V-PIC (two dimension in real space and three dimension in velocity space particle-in-cell) model for the H- extraction by using the binary collision model. Due to Coulomb collision, the lower energy part of the ion energy distribution function of H- ions has been greatly increased. The mean kinetic energy of the surface produced H- ions has been reduced to 0.65 eV from 1.5 eV. It has been suggested that the beam optics of the extracted H- ion beam is strongly affected by the energy relaxation process due to Coulomb collision.

Original languageEnglish
Article number02B918
JournalReview of Scientific Instruments
Volume87
Issue number2
DOIs
Publication statusPublished - 2016 Feb 1

    Fingerprint

ASJC Scopus subject areas

  • Instrumentation

Cite this

Goto, I., Miyamoto, K., Nishioka, S., Mattei, S., Lettry, J., Abe, S., & Hatayama, A. (2016). Effect of Coulomb collision on the negative ion extraction mechanism in negative ion sources. Review of Scientific Instruments, 87(2), [02B918]. https://doi.org/10.1063/1.4934206