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Fujiwara, Yukio; Watanabe, Kazuhiro; Okumura, Yoshikazu; Trainham, R.*; Jacquot, C.*
Review of Scientific Instruments, 76(1), p.013501_1 - 013501_5, 2005/01
Times Cited Count：0 Percentile：0.01(Instruments & Instrumentation)A new actively-cooled plasma electrode has been developed for long pulse operation in a cesium-seeded negative ion source. To keep the electrode temperature at about 300 
C, which is optimum range of temperature to enhance cesium effects, the electrode cooling structure has been designed using three-dimensional numerical simulation assuming that the heat flux from the source plasma was 15 W/cm
. Water cooling tubes were brazed to the plasma electrode substrate with spacers made of stainless steel which acts as a thermal resistance. The fabricated plasma electrode has been tested in a cesium-seeded volume negative ion source called Kamaboko source. The temperature of the electrode reached 280 C for the arc power of 41 kW, which is operating condition required for producing D- beams with current densities exceeding 20 mA/cm. It was demonstrated that the actively-cooled plasma electrode is applicable to long pulse operations, meeting the temperature requirement for optimizing the surface-production process of negative ions in the cesium seeded ion source.
Hachiue, Shunsuke; Teraoka, Yuden
JAERI-Tech 2004-066, 69 Pages, 2004/11
JAERI-Tech-2004-066.pdf:7.44MB
In order to progress chemical reaction studies at verious material surfaces using high speed and reactive ions and neutral particles beams, a high-speed neutral atomic and molecular beam apparatus has been developed. In this report, details of the apparatus and characteristics of actually-generated oxygen atomic and molecular ion/neutral beams are discribed. This apparatus is a ultra-high vacuum system consisting of a plasma ion source, electrostatic lens systems, a mass separator, and a charge transfer chamber. Total oxygen ion currents of 52 microamps at accerelation energy of 8 keV and 17 microamps even at 20 eV were obtained. Mass separation was also good so that an oxygen molecular ion beam of 11 microamps and an oxygen atomic ion beam of 5.5 microamps were obtained even at 20 eV. A neutral oxygen atomic or molecular beam was also generated with the flux density of 10
particles/cm/s.
Mizuno, Takatoshi*; Kitade, Yuki*; Hatayama, Akiyoshi*; Sakurabayashi, Toru*; Imai, Naoki*; Morishita, Takatoshi; Inoue, Takashi
Review of Scientific Instruments, 75(5), p.1760 - 1763, 2004/05
Times Cited Count：7 Percentile：39.52(Instruments & Instrumentation)Spatial non-uniformities of extracted negative ion beam were observed experimentally in tandem-type negative ion sources. To improve the beam uniformity, it is important to analyze the plasma profile in the ion source including magnetic filter effect. In the filter region, Lorentz force is important for both ions and electrons. However, their dynamics are completely different, i.e. electrons are magnetized and ions are not magnetized. Then, the system of two-dimensional two-fluid model equations is solved simultaneously to obtain self-consistent profiles of the plasma parameters. The result shows that a possible cause of spatial non-uniformity is the ion flow rather than ExB drift motion of electrons. This flow of ions is caused by synergetic effect of the force by electric field, Lorentz force and inertia force. To verify the results above and more quantitative comparisons with experiments, full 3D analysis is needed, because the electron loss along the field line is important for the plasma potential and the electric field in the filter region. Full 3D analysis is now in progress.
Luo, G.; Shu, Wataru; Nakamura, Hirofumi; Ohira, Shigeru; Hayashi, Takumi; Nishi, Masataka
JAERI-Tech 2004-031, 27 Pages, 2004/03
JAERI-Tech-2004-031.pdf:2.88MB
A plasma source has been constructed for investigating plasma-surface interactions in a tokamak. It is a compact device with a total length less than 1 m, compared to other existing facilities in the world. However, it can provide with stable plasma beams of low energy (
100 eV) and high flux (10
/m/s), close to the predicted edge plasma conditions near the ITER divertor. This report presents mainly its configuration and its characteristics, including influence of filament, arc discharge, magnetic field, bias voltage parameters, and so on, on plasma beam being delivered towards the sample. Also shown are the results of preliminary experiments of blister formation on tungsten samples irradiated by a deuterium plasma beam generated with the source.
Ishii, Yasuyuki; Isoya, Akira*; Kojima, Takuji
Nuclear Instruments and Methods in Physics Research B, 210, p.70 - 74, 2003/09
Times Cited Count：13 Percentile：64.64(Instruments & Instrumentation)The conception for this microbeam formation, which consists in combining beam contraction effect of acceleration process with the lens action, was published in 1991. The test machine was installed in JAERI. The study of reducing beam size showed that the incident beam condition strongly depend on its size. Recently about 40 keV stable microbeam 
of 0.1 
m order in radius has been obtained after optimizing the ion beam injection system. The test machine is composed of a duoplasmatron-type discharge source, an initial acceleration system, a main acceleration lens system, and microbeam diameter measurement system. We will present the schematic of the test machine and the result of the beam size measurement. Performance of the system will also show to depend mostly on how nicely a low energy injection beam is prepared at the entrance region.
Shimizu, Takashi; Morishita, Takatoshi; Kashiwagi, Mieko; Hanada, Masaya; Iga, Takashi*; Inoue, Takashi; Watanabe, Kazuhiro; Wada, Motoi*; Imai, Tsuyoshi
JAERI-Tech 2003-006, 26 Pages, 2003/03
JAERI-Tech-2003-006.pdf:1.12MB
no abstracts in English
Inoue, Takashi
Purazuma, Kaku Yugo Gakkai-Shi, 78(5), p.398 - 404, 2002/05
Neutral beam (NB) heating and current drivesystem for ITER fires the energetic particle beams of 1 MeV, 33 MW (16.5 MW/NB injector) into the fusion plasma. The design allows late installation of third NB injector for upgrade in current drive experiment toward steady state operation. The ITER NB system has been designed to fulfill requirements of the plasma physics, including advanced scenario achieved with off-axis current drive by NB. A design overview of the ITER NB system is described. The paper also reports recent R&D status of ion source and accelerator, as key components of the NB system, toward ITER construction. NB heating and current drive performance required in future tokamak reactors are discussed together with the necessary R&D issues.
Oga, Tokumichi; Umeda, Naotaka; Akino, Noboru; Ebisawa, Noboru; Grisham, L. R.*; Hikida, Shigenori*; Honda, Atsushi; Ito, Takao; Kawai, Mikito; Kazawa, Minoru; et al.
Review of Scientific Instruments, 73(2), p.1058 - 1060, 2002/02
Times Cited Count：12 Percentile：55.22(Instruments & Instrumentation)no abstracts in English
Fujiwara, Yukio; Okumura, Yoshikazu; Watanabe, Kazuhiro; Trainham, R.*; Jacquot, C.*
Review of Scientific Instruments, 73(2), p.298 - 304, 2002/02
Times Cited Count：4 Percentile：29.34(Instruments & Instrumentation)no abstracts in English
Shimizu, Takashi; Wada, Motoi*; Watanabe, Kazuhiro; Hanada, Masaya; Kashiwagi, Mieko; Iga, Takashi*; Inoue, Takashi; Morishita, Takatoshi; Amemiya, Toru*; Imai, Tsuyoshi
Dai-12-Kai Ryushisen No Sentanteki Oyo Gijutsu Ni Kansuru Shimpojiumu (BEAMS 2001) Hobunshu, p.25 - 28, 2001/11
no abstracts in English
Inoue, Takashi; Di Pietro, E.*; Hanada, Masaya; Hemsworth, R. S.*; Krylov, A.*; Kulygin, V.*; Massmann, P.*; Mondino, P. L.*; Okumura, Yoshikazu; Panasenkov, A.*; et al.
Fusion Engineering and Design, 56-57, p.517 - 521, 2001/10
Times Cited Count：64 Percentile：96.58(Nuclear Science & Technology)no abstracts in English
Kuriyama, Masaaki; Akino, Noboru; Ebisawa, Noboru; Grisham, L. R.*; Hikida, Shigenori*; Honda, Atsushi; Ito, Takao; Kawai, Mikito; Kazawa, Minoru; Kusaka, Makoto*; et al.
Fusion Engineering and Design, 56-57(Part.A), p.523 - 527, 2001/10
Times Cited Count：6 Percentile：44.06(Nuclear Science & Technology)no abstracts in English
Inoue, Takashi; Hemsworth, R. S.*; Kulygin, V.*; Okumura, Yoshikazu
Fusion Engineering and Design, 55(2-3), p.291 - 301, 2001/07
Times Cited Count：25 Percentile：84.31(Nuclear Science & Technology)no abstracts in English
Inoue, Takashi; Di Pietro, E.*; Mondino, P. L.*; Bayetti, P.*; Hemsworth, R. S.*; Massmann, P.*; Fujiwara, Yukio; Hanada, Masaya; Miyamoto, Kenji; Okumura, Yoshikazu; et al.
Review of Scientific Instruments, 71(2), p.744 - 746, 2000/02
Times Cited Count：17 Percentile：67.86(Instruments & Instrumentation)no abstracts in English
Kuriyama, Masaaki; Akino, Noboru; Ebisawa, Noboru; Grisham, L. R.*; Hikida, Shigenori*; Honda, Atsushi; Ito, Takao; Kawai, Mikito; Kazawa, Minoru; Kusaka, Makoto*; et al.
Proceedings of the 18th IEEE/NPSS Symposium on Fusion Engineering (SOFE '99), p.133 - 136, 1999/00
no abstracts in English
Fujiwara, Yukio; Miyamoto, Naoki*; Okumura, Yoshikazu
Review of Scientific Instruments, 69(2), p.1173 - 1175, 1998/02
Times Cited Count：7 Percentile：52.94(Instruments & Instrumentation)no abstracts in English
Inoue, Takashi; Okumura, Yoshikazu; Fujiwara, Yukio; Miyamoto, Kenji; Ohara, Yoshihiro; Miyamoto, Naoki*; Watanabe, Kazuhiro; B.Heinemann*; *
Fusion Technology 1996, 1, p.701 - 704, 1996/00
no abstracts in English
Shinto, Katsuhiro*; Okumura, Yoshikazu; *; Wada, Motoi*; *; Inoue, Takashi; Miyamoto, Kenji; Nagase, Akihito*
Japanese Journal of Applied Physics, 35(3), p.1894 - 1900, 1996/00
Times Cited Count：20 Percentile：68.16(Physics, Applied)no abstracts in English
Inoue, Takashi; Hanada, Masaya; Kuriyama, Masaaki; *; Matsuoka, Mamoru; Miyamoto, Kenji; Ohara, Yoshihiro; Okumura, Yoshikazu; Watanabe, Kazuhiro
IAEA-CN-60/F-10, 0, p.687 - 693, 1995/00
no abstracts in English
Watanabe, Kazuhiro; Araki, Masanori; Dairaku, Masayuki; Horiike, Hiroshi; Ohara, Yoshihiro; Okumura, Yoshikazu; Tanaka, Shigeru; ; Pamela, J.*
JAERI-M 90-212, 56 Pages, 1990/12
no abstracts in English
