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Journal Articles

3D modeling of the electron energy distribution function in negative hydrogen ion sources

Terasaki, Ryo*; Fujino, Ikuro*; Hatayama, Akiyoshi*; Mizuno, Takatoshi; Inoue, Takashi

Review of Scientific Instruments, 81(2), p.02A703_1 - 02A703_3, 2010/02

https://doi.org/10.1063/1.3273075
 Times Cited Count：23 Percentile：68.01(Instruments & Instrumentation)

In order to develop the large H$$^{-}$$ ion source for future fusion reactors, the uniform production of H$$^{-}$$ ions is one of the important issues. Recently, it has been shown experimentally in JAEA 10A negative ion source that the non-uniformity of the electron energy distribution function (EEDF) inside the source and the resultant non-uniformity of the H$$^{-}$$ production strongly affect the H$$^{-}$$ beam optics. Therefore, modeling of the EEDF and analysis of the spatial non-uniformity of the EEDF is necessary to optimize H$$^{-}$$ ion source and the beam optics. For this purpose, we are developing the 3D3V Monte Carlo modeling of the EEDF in realistic 3D geometry. The code reproduces the spatial non-uniformity of the EEDF observed in the experiments. Our developing code is a powerful tool for the design of the next generation sources.

Journal Articles

Effect of energy relaxation of H$$^{0}$$ atoms at the wall on the production profile of H$$^{-}$$ ions in large negative ion sources

Takado, Naoyuki*; Matsushita, Daisuke*; Fujino, Ikuro*; Hatayama, Akiyoshi*; Tobari, Hiroyuki; Inoue, Takashi

Review of Scientific Instruments, 79(2), p.02A503_1 - 02A503_4, 2008/02

https://doi.org/10.1063/1.2802583
 Times Cited Count：2 Percentile：14.59(Instruments & Instrumentation)

Production and transport process of the H$$^{0}$$ atoms are numerically simulated using a three-dimensional Monte Carlo transport code. The code was applied to the "JAEA 10 ampere negative ion source" under Cs-seeded condition to obtain a spatial distribution of surface-produced H$$^{0}$$ ions. In this analysis, we focus on the effect of the energy relaxation of the H$$^{0}$$ atoms at the wall on the H$$^{-}$$ ion production from the H$$^{0}$$ atoms. The result indicates that, by considering the energy relaxation of the H$$^{0}$$ atoms at the wall, the production profile of the surface-produced H$$^{-}$$ ion is well reflected in the production profile of the H$$^{0}$$ atom production.

Journal Articles

Analysis of electron energy distribution of an arc-discharge H$$^{-}$$ ion source with Monte Carlo simulation

Fujino, Ikuro*; Hatayama, Akiyoshi*; Takado, Naoyuki*; Inoue, Takashi

Review of Scientific Instruments, 79(2), p.02A510_1 - 02A510_3, 2008/02

https://doi.org/10.1063/1.2816966
 Times Cited Count：21 Percentile：65.59(Instruments & Instrumentation)

For optimization and accurate prediction of the amount of H$$^{-}$$ ion production in negative ion source, analysis of electron energy distribution function (EEDF) is necessary. We developed a numerical code which analyzes EEDF in the tandem-type arc discharge source. It is a three-dimensional Monte Carlo simulation code with the effects of cusp, filter, and extraction magnets. Coulomb collision between electrons is treated with Takizuka's model and several inelastic collisions are treated with null-collision method. We applied this code to the JAEA 10 ampere negative ion source. As a result, the order of electron density is in good agreement with experimental results. In addition, the obtained EEDF is qualitatively in good agreement with experimental results.

Journal Articles

Mechanisms and kinetics of the post-spinel transformation in Mg$$_{2}$$SiO$$_{4}$$

Kubo, Tomoaki*; Otani, Eiji*; Kato, Takumi*; Urakawa, Satoru*; Suzuki, Akio*; Kambe, Yuichi*; Funakoshi, Kenichi*; Utsumi, Wataru; Kikegawa, Takumi*; Fujino, Kiyoshi*

Physics of the Earth and Planetary Interiors, 129(1-2), p.153 - 171, 2002/01

https://doi.org/10.1016/S0031-9201(01)00270-9
 Times Cited Count：50 Percentile：66.4(Geochemistry & Geophysics)

no abstracts in English

Journal Articles

Formation of metastable assemblages and mechanisms of the grain-size reduction in the postspinel transformation of Mg$$_{2}$$SiO$$_{4}$$

Kubo, Tomoaki*; Otani, Eiji*; Kato, Takumi*; Urakawa, Satoru*; Suzuki, Akio*; Kambe, Yuichi*; Funakoshi, Kenichi*; Utsumi, Wataru; Fujino, Kiyoshi*

Geophysical Research Letters, 27(6), p.807 - 810, 2000/03

https://doi.org/10.1029/1999GL008430
 Times Cited Count：33 Percentile：62.01(Geosciences, Multidisciplinary)

no abstracts in English

Journal Articles

X ray diffraction measurements in a double-stage multianvil apparatus using ADC anvils

Irifune, Tetsuo*; Kuroda, Koji*; Nishiyama, Norimasa*; Inoue, Toru*; Funamori, Nobumasa*; Uchida, Takeyuki*; Yagi, Takehiko*; Utsumi, Wataru; Miyajima, Nobuyoshi*; Fujino, Kiyoshi*; et al.

Geophysical Monograph 101 (Properties of Earth and Planetary Materials at High Pressure and Temperature), p.1 - 8, 1998/00

no abstracts in English

Journal Articles

Lattice location of deuterium in Nb-Mo with ion beams

Naramoto, Hiroshi; Kawatsura, Kiyoshi; Sataka, Masao; ; Nakai, Yota; Ozawa, Kunio*; *; Fujino, Yutaka*; *

Nuclear Instruments and Methods in Physics Research B, 33, p.595 - 598, 1988/00

https://doi.org/10.1016/0168-583X(88)90638-6

no abstracts in English

7 (Records 1-7 displayed on this page)
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