Modeling of neutrals in the Linac4 H- ion source plasma

Hydrogen atom production density profile and Hα intensity by collisional radiative model

Takashi Yamamoto, T. Shibata, M. Ohta, M. Yasumoto, K. Nishida, Akiyoshi Hatayama, S. Mattei, J. Lettry, K. Sawada, U. Fantz

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

To control the H0 atom production profile in the H- ion sources is one of the important issues for the efficient and uniform surface H- production. The purpose of this study is to construct a collisional radiative (CR) model to calculate the effective production rate of H0 atoms from H2 molecules in the model geometry of the radio-frequency (RF) H- ion source for Linac4 accelerator. In order to validate the CR model by comparison with the experimental results from the optical emission spectroscopy, it is also necessary for the model to calculate Balmer photon emission rate in the source. As a basic test of the model, the time evolutions of H0 production and the Balmer Hα photon emission rate are calculated for given electron energy distribution functions in the Linac4 RF H- ion source. Reasonable test results are obtained and basis for the detailed comparisons with experimental results have been established.

Original languageEnglish
Article number02B118
JournalReview of Scientific Instruments
Volume85
Issue number2
DOIs
Publication statusPublished - 2014 Feb 1

Fingerprint

Ion sources
ion sources
hydrogen atoms
Plasmas
Atoms
Hydrogen
profiles
radio frequencies
Photons
Optical emission spectroscopy
optical emission spectroscopy
photons
Particle accelerators
Distribution functions
atoms
energy distribution
accelerators
distribution functions
electron energy
Molecules

ASJC Scopus subject areas

  • Instrumentation

Cite this

Modeling of neutrals in the Linac4 H- ion source plasma : Hydrogen atom production density profile and Hα intensity by collisional radiative model. / Yamamoto, Takashi; Shibata, T.; Ohta, M.; Yasumoto, M.; Nishida, K.; Hatayama, Akiyoshi; Mattei, S.; Lettry, J.; Sawada, K.; Fantz, U.

In: Review of Scientific Instruments, Vol. 85, No. 2, 02B118, 01.02.2014.

Research output: Contribution to journalArticle

Yamamoto, Takashi ; Shibata, T. ; Ohta, M. ; Yasumoto, M. ; Nishida, K. ; Hatayama, Akiyoshi ; Mattei, S. ; Lettry, J. ; Sawada, K. ; Fantz, U. / Modeling of neutrals in the Linac4 H- ion source plasma : Hydrogen atom production density profile and Hα intensity by collisional radiative model. In: Review of Scientific Instruments. 2014 ; Vol. 85, No. 2.
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