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Journal Articles

Numerical analysis of the production profile of H$$^{0}$$ atoms and subsequent H$$^{-}$$ ions in large negative ion sources

Takado, Naoyuki*; Tobari, Hiroyuki; Inoue, Takashi; Hanatani, Junji*; Hatayama, Akiyoshi*; Hanada, Masaya; Kashiwagi, Mieko; Sakamoto, Keishi

Journal of Applied Physics, 103(5), p.053302_1 - 053302_12, 2008/03

https://doi.org/10.1063/1.2887996
 Times Cited Count：25 Percentile：67.05(Physics, Applied)

The production and transport processes of H$$^{0}$$ atoms are numerically simulated using a three-dimensional Monte Carlo transport code. The code was applied to the large JAEA 10 ampere negative ion source under the Cs-seeded condition to obtain a spatial distribution of surface-produced H$$^{-}$$ ions. In the H$$^{0}$$ atom transport process, the energy relaxation of the H$$^{0}$$ atoms, which affects the surface H$$^{-}$$ ion production rate, is taken into account. The result indicates that the surface H$$^{-}$$ ion production is enhanced near the high-electron-temperature region where H$$^{0}$$ atom production is localized.

Journal Articles

Numerical analysis of the hydrogen atom density in a negative ion source

Takato, Naoyuki; Hanatani, Junji*; Mizuno, Takatoshi*; Hatayama, Akiyoshi*; Tobari, Hiroyuki; Hanada, Masaya; Inoue, Takashi; Taniguchi, Masaki; Dairaku, Masayuki; Kashiwagi, Mieko; et al.

AIP Conference Proceedings 925, p.38 - 45, 2007/09

https://doi.org/10.1063/1.2773644

The production and transport processes of the H$$^0$$ atom are numerically simulated to obtain the H$$^0$$ atom density. The three dimensional transport code using the Monte Carlo method has been applied to H$$^0$$ atoms in the large "JAEA 10 ampere negative ion source" under the Cs-seeded condition. In this study, the production rate of H$$^0$$ atoms through the dissociation process of H$$_2$$ molecules is estimated from single probe characteristics of the Langmuir probe measurement. In addition, the energy relaxation process of H$$^0$$ atoms is also considered. The results show that the existence of high-energy electrons and the energy relaxation process of H$$^0$$ atoms affect the H$$^0$$ atom density.

Journal Articles

Numerical analysis of the spatial nonuniformity in a Cs-seeded H$$^{-}$$ ion source

Takado, Naoyuki*; Hanatani, Junji*; Mizuno, Takatoshi*; Kato, Kyohei*; Hatayama, Akiyoshi*; Hanada, Masaya; Seki, Takayoshi; Inoue, Takashi

Review of Scientific Instruments, 77(3), p.03A533_1 - 03A533_3, 2006/03

https://doi.org/10.1063/1.2172356
 Times Cited Count：14 Percentile：56.68(Instruments & Instrumentation)

Surface production and transport process of H$$^{-}$$ ions are numerically simulated to clarify the origin of H$$^{-}$$ beam non-uniformity. A three-dimensional transport code using Monte Carlo method has been applied to productions of H$$^{0}$$ atoms and H$$^{-}$$ ions in a large negative ion source under the Cs seeded condition. The results show that a large fraction of hydrogen atoms are produced in a high electron temperature region. This leads to a spatial non-uniformity of H$$^{0}$$ atom flux to the plasma grid where H$$^{0}$$ atoms capture electrons and converted to H$$^{-}$$ ions. In addition, most surface-produced H$$^{-}$$ ions are extracted even through the high electron temperature region without destruction.

Oral presentation

Numerical analysis of the production profile for hydrogen atoms and negative ions in a Cs-seeded large negative ion source

Takato, Naoyuki; Hanatani, Junji*; Kato, Kyohei*; Mizuno, Takatoshi*; Hatayama, Akiyoshi*; Tobari, Hiroyuki; Hanada, Masaya; Inoue, Takashi; Taniguchi, Masaki; Hasebe, Mieko; et al.

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