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Numerical analysis of atomic density distribution in arc driven negative ion sources
T Yamamoto1, T Shibata1, M Kashiwagi2
1Graduate School of Science and Technology, Keio University, 3-14-1 Hiyoshi, Yokohama 223-8522, Japan.
This study calculates atomic hydrogen (H(0)) density in a negative ion source using a collisional radiative model. High-energy electrons enhance H(0) production and ionization, influencing density distribution.
Area of Science:
- Plasma physics
- Atomic and molecular physics
- Fusion energy research
Background:
- Accurate calculation of atomic hydrogen density is crucial for negative ion source performance.
- Non-equilibrium electron energy distribution functions (EEDFs) significantly impact plasma kinetics.
Purpose of the Study:
- To calculate the atomic hydrogen (H(0)) density distribution within the JAEA 10 ampere negative ion source.
- To investigate the influence of electron energy distribution on H(0) production and density.
Main Methods:
- Development of a collisional radiative model.
- Incorporation of non-equilibrium EEDFs derived from 3D electron transport analysis.
- Calculation of H(0) production rate, ionization rate, and density distribution.
Main Results:
- H(0) production and ionization rates are enhanced in regions with high-energy electrons.
- Calculated H(0) density distribution, excluding transport effects, is lower in the upper region of the source.
- The study quantifies the impact of electron energy on H(0) density.
Conclusions:
- The developed model provides insights into H(0) density distribution in negative ion sources.
- Electron energy distribution is a key factor in determining H(0) production.
- Future work will incorporate H(0) transport for a more comprehensive density distribution analysis.
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