2004 Fiscal Year Final Research Report Summary
Pellet Developments and Plasma Diagnostics
| Project/Area Number |
11210207
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| Research Category |
Grant-in-Aid for Scientific Research on Priority Areas
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| Allocation Type | Single-year Grants |
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| Review Section |
Science and Engineering
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| Research Institution | National Institute for Fusion Science |
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Principal Investigator |
SUDO Shigeru National Institute for Fusion Science, Department of LHD Project, Professor, 大型ヘリカル研究部, 教授 (50142302)
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| Co-Investigator(Kenkyū-buntansha) |
SATO Kuninori National Institute for Fusion Science, Department of LHD Project, Associate professor, 大型ヘリカル研究部, 助教授 (70126861)
OZAKI Tetsuo National Institute for Fusion Science, Department of LHD Project, Associate professor, 大型ヘリカル研究部, 助教授 (50183033)
TAMURA Naoki National Institute for Fusion Science, Department of LHD Project, Research associate, 大型ヘリカル研究部, 助手 (80390631)
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| Project Period (FY) |
1999 – 2004
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| Keywords | Tracer Encapsulated Pellet / TECPEL / Local Particle Transport Diagnostics / LHD / Solid Hydrogen |
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| Research Abstract |
Knowledge of plasma transport is a key for achieving high performance plasmas confinement in fusion devices. Injection of impurity cores inserted into polysterene capsules gives a local plasma perturbation, however, some extra impurities such as carbon contained in the capsule appear. Thus, it is proposed to use pellets made from ice of bulk plasmas components, i.e. hydrogen isotopes, as capsules. When such pellet enters the plasma, the outer solid hydrogen layer is ablated first, keeping the impurity core from ablation up to the plasma column axis. This results in an intensive ablation of the core providing the small localization of the deposited tracer ions. Experimentally observed evolution of the impurity ions gives data for analytical calculation of diffusion coefficient of the bulk plasmas. Thus, a new injector for making solid hydrogen pellets around impurity cores has been developed for plasma transport study in Large Helical Device. A new technique has been employed for automatic loading carbon or polysterene cores of 0.2 mm diameter from a gun magazine to a light-gas gun barrel. The injector is equipped with a cryorefrigerator and is able to form a 3.2 mm long and 3 mm diameter cylindrical solid hydrogen pellet at 7-8 K with an impurity core in its center within 6 minutes and to inject it in the light-gas gun up to 1 km/s. The reliability and technology of pellet formation and acceleration in the injector was sufficient and efficient. A differential pumping system with a guide tube for pellet transportation to the plasma and cutting off a propellant gas has been designed and is being installed between the injector and LHD.
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Research Products
(20 results)
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[Journal Article] Particle transport diagnostics on CHS and LHD with tracer-encapsulated solid pellet injection2002
Author(s)
S.Sudo, N.Tamura, K.Khlopenkov, S.Muto, H.Funaba, I.Viniar, V.Sergeev, K.Sato, K.Ida, K.Kawahata, A.Komori, K.Matsuoka, K.Narihara, S.Okamura, N.Ohyabu, K.Tanaka, 0.Motojima
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Journal Title
Plasma Physics and Controlled Fusion Vol.44
Pages: 129-135
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Transient Transport Studies for Particle and Heat Using Tracer-encapsulated Solid Pellet Injection in LHD2002
Author(s)
N.Tamura, K.V.Khlopenkov, V.Yu.Sergeev, B.V.Kuteev, S.Sudo, S.Muto, H.Funaba, S.Inagaki, Y.Nagayama, K.Kawahata, LHD experimental groups I, II
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Journal Title
Journal of Plasma and Fusion Research SERIES Vol.5
Pages: 400-403
Description
「研究成果報告書概要(欧文)」より
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