Numerical study of the H0 atomic density and the balmer line intensity profiles in a hydrogen negative ion source with the effect of non-equilibrium electron energy distribution function

Takanori Shibata, Mieko Kashiwagi, Akiyoshi Hatayama, Keiji Sawada, Takashi Inoue, Masaya Hanada

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Spatial profiles of the atomic (H0) density and the resultant Hα line intensity are investigated in a large negative ion source (the Japan Atomic Energy Agency (JAEA) 10A negative ion source). The H0 density analysis has been done in the present study with the effects of production, transport, and ionization processes by taking into account the non-Maxwellian component of electron energy distribution function (EEDF). The H0 density profile shows a non-uniform spatial profile due to the local enhancement of the H0 production rate even with the flattening effects by the ionization and the transport processes. The Hα line intensity observed from the viewing ports in the spectrometry is compared with the line intensity in the calculation to validate the numerical results. The both results show a good agreement in the spatial profile. It has been shown that the non-Maxwellian component of the EEDF plays an important role to determine the profile of the Hα line intensity in the plasma production region.

Original languageEnglish
Article number1401011
JournalPlasma and Fusion Research
Volume9
DOIs
Publication statusPublished - 2014

Fingerprint

hydrogen ions
negative ions
ion sources
energy distribution
H lines
distribution functions
electron energy
profiles
ionization
flattening
nuclear energy
Japan
augmentation
spectroscopy

Keywords

  • Atomic transport
  • Collisional-radiative model
  • Electron energy distribution function
  • Negative ion source
  • Numerical analysis
  • Spatial non-uniformity of atomic density

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Numerical study of the H0 atomic density and the balmer line intensity profiles in a hydrogen negative ion source with the effect of non-equilibrium electron energy distribution function. / Shibata, Takanori; Kashiwagi, Mieko; Hatayama, Akiyoshi; Sawada, Keiji; Inoue, Takashi; Hanada, Masaya.

In: Plasma and Fusion Research, Vol. 9, 1401011, 2014.

Research output: Contribution to journalArticle

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abstract = "Spatial profiles of the atomic (H0) density and the resultant Hα line intensity are investigated in a large negative ion source (the Japan Atomic Energy Agency (JAEA) 10A negative ion source). The H0 density analysis has been done in the present study with the effects of production, transport, and ionization processes by taking into account the non-Maxwellian component of electron energy distribution function (EEDF). The H0 density profile shows a non-uniform spatial profile due to the local enhancement of the H0 production rate even with the flattening effects by the ionization and the transport processes. The Hα line intensity observed from the viewing ports in the spectrometry is compared with the line intensity in the calculation to validate the numerical results. The both results show a good agreement in the spatial profile. It has been shown that the non-Maxwellian component of the EEDF plays an important role to determine the profile of the Hα line intensity in the plasma production region.",
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AU - Shibata, Takanori

AU - Kashiwagi, Mieko

AU - Hatayama, Akiyoshi

AU - Sawada, Keiji

AU - Inoue, Takashi

AU - Hanada, Masaya

PY - 2014

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N2 - Spatial profiles of the atomic (H0) density and the resultant Hα line intensity are investigated in a large negative ion source (the Japan Atomic Energy Agency (JAEA) 10A negative ion source). The H0 density analysis has been done in the present study with the effects of production, transport, and ionization processes by taking into account the non-Maxwellian component of electron energy distribution function (EEDF). The H0 density profile shows a non-uniform spatial profile due to the local enhancement of the H0 production rate even with the flattening effects by the ionization and the transport processes. The Hα line intensity observed from the viewing ports in the spectrometry is compared with the line intensity in the calculation to validate the numerical results. The both results show a good agreement in the spatial profile. It has been shown that the non-Maxwellian component of the EEDF plays an important role to determine the profile of the Hα line intensity in the plasma production region.

AB - Spatial profiles of the atomic (H0) density and the resultant Hα line intensity are investigated in a large negative ion source (the Japan Atomic Energy Agency (JAEA) 10A negative ion source). The H0 density analysis has been done in the present study with the effects of production, transport, and ionization processes by taking into account the non-Maxwellian component of electron energy distribution function (EEDF). The H0 density profile shows a non-uniform spatial profile due to the local enhancement of the H0 production rate even with the flattening effects by the ionization and the transport processes. The Hα line intensity observed from the viewing ports in the spectrometry is compared with the line intensity in the calculation to validate the numerical results. The both results show a good agreement in the spatial profile. It has been shown that the non-Maxwellian component of the EEDF plays an important role to determine the profile of the Hα line intensity in the plasma production region.

KW - Atomic transport

KW - Collisional-radiative model

KW - Electron energy distribution function

KW - Negative ion source

KW - Numerical analysis

KW - Spatial non-uniformity of atomic density

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