Numerical Study of the H<sup>0 </sup>Atomic Density and the Balmer Line Intensity Profiles in a Hydrogen Negative Ion Source with the Effect of Non-Equilibrium Electron Energy Distribution Function

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Abstract

Spatial profiles of the atomic (H<sup>0</sup>) density and the resultant H<sub>α </sub>line intensity are investigated in a large negative ion source (the Japan Atomic Energy Agency (JAEA) 10 A negative ion source). The H<sup>0 </sup>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 H<sup>0 </sup>density profile shows a non-uniform spatial profile due to the local enhancement of the H<sup>0 </sup>production rate even with the flattening effects by the ionization and the transport processes. The H<sub>α </sub>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 H<sub>α </sub>line intensity in the plasma production region.

Journal

  • Plasma and Fusion Research

    Plasma and Fusion Research 9(0), 1401011-1401011, 2014

    The Japan Society of Plasma Science and Nuclear Fusion Research

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