Effect of high energy electrons on H- production and destruction in a high current DC negative ion source for cyclotron

M. Onai, H. Etoh, Y. Aoki, T. Shibata, S. Mattei, S. Fujita, Akiyoshi Hatayama, J. Lettry

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Recently, a filament driven multi-cusp negative ion source has been developed for proton cyclotrons in medical applications. In this study, numerical modeling of the filament arc-discharge source plasma has been done with kinetic modeling of electrons in the ion source plasmas by the multi-cusp arc-discharge code and zero dimensional rate equations for hydrogen molecules and negative ions. In this paper, main focus is placed on the effects of the arc-discharge power on the electron energy distribution function and the resultant H- production. The modelling results reasonably explains the dependence of the H- extraction current on the arc-discharge power in the experiments.

Original languageEnglish
Article number02B127
JournalReview of Scientific Instruments
Volume87
Issue number2
DOIs
Publication statusPublished - 2016 Feb 1

Fingerprint

arc discharges
Cyclotrons
Ion sources
negative ions
ion sources
high energy electrons
destruction
cyclotrons
high current
Negative ions
direct current
Plasma sources
Electrons
Medical applications
cusps
Distribution functions
filaments
Protons
Plasmas
Hydrogen

ASJC Scopus subject areas

  • Instrumentation

Cite this

Effect of high energy electrons on H- production and destruction in a high current DC negative ion source for cyclotron. / Onai, M.; Etoh, H.; Aoki, Y.; Shibata, T.; Mattei, S.; Fujita, S.; Hatayama, Akiyoshi; Lettry, J.

In: Review of Scientific Instruments, Vol. 87, No. 2, 02B127, 01.02.2016.

Research output: Contribution to journalArticle

Onai, M. ; Etoh, H. ; Aoki, Y. ; Shibata, T. ; Mattei, S. ; Fujita, S. ; Hatayama, Akiyoshi ; Lettry, J. / Effect of high energy electrons on H- production and destruction in a high current DC negative ion source for cyclotron. In: Review of Scientific Instruments. 2016 ; Vol. 87, No. 2.
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