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Numerical analysis of H$$^{-}$$ ion transport processes in Cs-seeded negative ion sources

Matsushita, Daisuke*; Takado, Naoyuki*; Hatayama, Akiyoshi*; Inoue, Takashi

The H$$^{-}$$ ion transport processes are numerically simulated to understand the extraction process of surface-produced H$$^{-}$$ ions. The three-dimensional transport code using Monte Carlo method has been applied to calculate the H$$^{-}$$ ion extraction probabilities in the model geometry of the JAEA 10 ampere negative ion source. The roles of (1) filter magnetic field and (2) collisions with neutrals (H$$^{0}$$ atoms and H$$_{2}$$ molecules) on the H$$^{-}$$ ion extraction are systematically studied. The results show that H$$^{-}$$ ions are extracted mainly by the filter magnetic field under the low gas pressure condition. The simulation results of extracted H$$^{-}$$ ion beam intensity in the JAEA 10 ampere negative ion source without the magnetic filter tend to be smaller than the experimental results, especially under the low pressure condition.

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