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

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ion extraction
Coulomb collisions
Ion sources
negative ions
ion sources
Negative ions
Ions
Relaxation processes
Ion beams
Optics
ions
ion beams
optics
Charged particles
Kinetic energy
Distribution functions
energy
energy distribution
charged particles
kinetic energy

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

Effect of Coulomb collision on the negative ion extraction mechanism in negative ion sources. / Goto, I.; Miyamoto, K.; Nishioka, S.; Mattei, S.; Lettry, J.; Abe, S.; Hatayama, Akiyoshi.

In: Review of Scientific Instruments, Vol. 87, No. 2, 02B918, 01.02.2016.

Research output: Contribution to journalArticle

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, vol. 87, no. 2, 02B918. https://doi.org/10.1063/1.4934206
Goto, I. ; Miyamoto, K. ; Nishioka, S. ; Mattei, S. ; Lettry, J. ; Abe, S. ; Hatayama, Akiyoshi. / Effect of Coulomb collision on the negative ion extraction mechanism in negative ion sources. In: Review of Scientific Instruments. 2016 ; Vol. 87, No. 2.
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