Study on physics mechanism of vacuum discharge toward electrostatic accelerator of the energy higher than 1 MeV
Project/Area Number |
18560807
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Research Category |
Grant-in-Aid for Scientific Research (C)
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Allocation Type | Single-year Grants |
Section | 一般 |
Research Field |
Nuclear engineering
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Research Institution | Japan Atomic Energy Agency |
Principal Investigator |
INOUE Takashi Japan Atomic Energy Agency, Fusion R & D Directorate, Principal Research Engineer (00354639)
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Co-Investigator(Kenkyū-buntansha) |
WATANABE Kazuhiro Japan Atomic Energy Agency, Fusion R & D Directorate, Principal Research Engineer (90354638)
KASHIWAGI Mieko Japan Atomic Energy Agency, Fusion R & D Directorate, Research Engineer (50354642)
UMEDA Naotaka Japan Atomic Energy Agency, Fusion R & D Directorate, Scientist (40354659)
|
Project Period (FY) |
2006 – 2007
|
Project Status |
Completed (Fiscal Year 2007)
|
Budget Amount *help |
¥2,160,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥360,000)
Fiscal Year 2007: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2006: ¥600,000 (Direct Cost: ¥600,000)
|
Keywords | Accelerator / Plasma / Vacuum discharge / Vacuum insulation / Clump theory / Triple junction / Organic insulation material / X線 |
Research Abstract |
Using a MeV accelerainr being developed for neutral beam injector ofITER, experiments on vacuum insulation have been carried out to establish physics and engineering basis toward general purpose electrostatic accelerator of the beam energy more than 1MeV. ● A large bore FRP (glass fiber reinforced epoxy) insulator was tested its applicability toward the accelerator of more than 1MeV. Prevention of surface flashover was demonstrated by reducing the stress at cathode side triple junction (interface of vacuum metal and dielectric insulator) below 1kV/mm. ● Data base on vacuum insulation was established for a range of vacuum gap width in real accelerator geometries. (1) Achievable voltage as a function of gap length seems to follow to Clump theory (2) Achievable voltages in the real accelerator geometries are about a half of that achieved with a quasi-ideal Rogowsky electrode, even the vacuum gap length were the same in both cases. (3) The deterioration of voltage holding in the real accelerator geometries are probably due to local electric field concentration in the accelerators, such as corner of the grid support or junction between grids and grid support structures. ● Extrapolation of achievable voltage in the accelerator at various gas pressure suggests possibility of vacuum and glow discharge prevention even the voltage was 2MV by maintaining the pressure at 0.02Pa, though necessary vacuum gap length would be as long as 2m.
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Report
(3 results)
Research Products
(16 results)
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[Journal Article] High energy, high current accelerator development for ITER NBI at JADA(web公開済)2009
Author(s)
M. Kashiwagi, M. Taniguchi, M. Dairaku, H. P. L. de Esch, L. R. Grisham, L. Svensson, H. Tobari, N. Umeda, K. Watanabe, K. Sakamoto, T. Inoue
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Journal Title
Description
「研究成果報告書概要(和文)」より
Related Report
Peer Reviewed
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[Journal Article] H. P. L. de Esch, L. Svensson2009
Author(s)
M. Taniguchi, M. Kashiwagi, N. Umeda, M. Dairaku, K Watanabe, T. Inoue
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Journal Title
Japan Atomic Energy Agency Research Report JAEA-Research 2008-121
Pages: 1-26
Description
「研究成果報告書概要(欧文)」より
Related Report
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[Journal Article] High energy, high current accelerator development for ITER NBI at JADA2009
Author(s)
M. Kashiwagi, M. Taniguchi, M. Dairaku, H. P. L. de Esch, L. R. Grisham, L. Svensson, H. Tobari, N. Umeda, K. Watanabe, K. Sakamoto, T. Inoue
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Journal Title
Nuclear Fusion (in electronic journal)
Description
「研究成果報告書概要(欧文)」より
Related Report
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[Journal Article] High energy, high current accelerator development for ITER NBI at JADA(web公開済)2009
Author(s)
M. Kashiwagi, M. Taniguchi, M. Dairaku, H. P. L. de Esch, Grisham L. R., L. Svensson, H. Tobari, N. Umeda, K. Watanabe, K. Sakamoto, T. Inoue
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Journal Title
Related Report
Peer Reviewed
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[Presentation] Development of 1MeV H^-ion accelerator at JAEA for ITER NB2008
Author(s)
谷口正樹, 柏木美恵子, Hubertde Esch, Svensson Lennart, 梅田尚孝, 渡邉和弘, 戸張博之, 大楽正幸, 坂本慶司, 井上多加志
Organizer
1st International conference on negative ions, beams and sources
Place of Presentation
エクスアンプロバンス(フランス)
Year and Date
2008-09-10
Description
「研究成果報告書概要(和文)」より
Related Report
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[Presentation] Development of 1MeV H^- ion accelerator at JAEA for ITER NB2008
Author(s)
M. Taniguchi, M. Kashiwagi, H. P. L. de Esch, L. Svensson, N. Umeda, K. Watanabe, H. Tobari, M. Dairaku, K. Sakamoto, T. Inoue
Organizer
1st International conference on negative ions, beams and sources
Place of Presentation
Aix en Provence, France
Year and Date
2008-09-10
Description
「研究成果報告書概要(欧文)」より
Related Report
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[Presentation] High energy, high current accelerator development for ITER NBI at JADA2008
Author(s)
M. Kashiwagi, M. Taniguchi, M. Dairaku, H. P. L. de Esch, L. R. Grisham, L. Svensson, H. Tobari, N. Umeda, K. Watanabe, K. Sakamoto, T. Inoue
Organizer
22nd IAEA Fusion Energy Conference
Place of Presentation
ジュネーブ(スイス)
Description
「研究成果報告書概要(和文)」より
Related Report
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[Presentation] High energy, high current accelerator development for ITER NBI at JADA2008
Author(s)
M. Kashiwagi, M. Taniguchi, M. Dairaku, H. P. L. de Esch, L. R. Grisham, L. Svensson, H. Tobari, N. Umeda, K. Watanabe, K. Sakamoto, T. Inoue
Organizer
22nd LAEA Fusion Energy Conference
Place of Presentation
Geneva, Switzerland
Description
「研究成果報告書概要(欧文)」より
Related Report
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