2007 Fiscal Year Final Research Report Summary
Study of Spherical Tokamak of Burning Plasma with TF-CS Hybrid Force-Balanced Coils
| Project/Area Number |
17360440
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Nuclear fusion studies
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
TSUTSUI Hiroaki Tokyo Institute of Technology, Research Laboratory for Nuclear Reactors, Assistant Professor (20227440)
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| Co-Investigator(Kenkyū-buntansha) |
SHIMADA Ryuichi Tokyo Institute of Technology, Research Laboratory for Nuclear Reactors, Professor (40206181)
TSUJI-IIO Shunji Tokyo Institute of Technology, Research Laboratory for Nuclear Reactors, Associate Professor (90272723)
NOMURA Shinichi Tokyo Institute of Technology, Integrated Research Institute, Researcher (90401520)
TANI Keiji JAEA, 那珂核融合研究所・核融合研究開発部門, Senior Principal Researcher (00446452)
NAKAMURA Yukiharu JAEA, 核融合炉システム研究グループ, Senior Principal Researcher (80354570)
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| Project Period (FY) |
2005 – 2007
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| Keywords | spherical torus / alpha particle / ripple / force-balanced coil / virial theorem / finite larmor radius effect / stress / internal transport barrier |
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| Research Abstract |
Stress distributions of a compact tokamak device Tbdoroki-II with TF-CS hybrid type forte-balanced coils were measured. The measured values were similar to analytically evaluated values, and the reduction of stress was experimentally confirmed.]
A fully-inonduced current start up process of a spherical torus (ST) with a transport model of CDBM was numerically simulated. This results show the possibility of a current oscillation by interactions of profiles of internal transport barrier, pressure and boot strap current. A possibility of an over-drive of plasma current was also shown.
A finite Larmor radius effect in ST is important because of the weakness of magnetic field compared with that of conventional tokamak. A computation code to calculate trajectory and diffusion coefficient without guiding center approximation was developed. The results were compared with those of conventional tokamak by guiding center approximation. Especially, we investigated an anomalous diffusion by a resonance of toroidal field ripple and banana particles, and evaluated an energy dependence of the diffusion coefficients. The result shows that Larmor motion affects the toroidal phase of banana tip, and softens the resonance. In order to investigate the physical mechanism of the resonance, we use the simple equilibrium configuration with a circular cross section of a conventional tokamak. We numerically found that the peaks of diffusion coefficients appears around the resonance energies of axisymmetric magnetic field. Moreover, distortion of trajectories by the resonance in a phase space makes island configurations, transverse motions by collisions enhance the diffusion.
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[Journal Article] Finite Larmor Radius Effects on Ripple Diffusion in Tokamaks2008
Author(s)
H., Mimata, K., Tani, K., Tobita, H., Tsutsui, S., Tsuji-Iio, R., Shimada
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Journal Title
Progress in Nuclear Energy Vol. 50
Pages: P638-642
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Development of a One Tenth Sized Model Coil for 100-MJ Class SMES Using Force-Balanced Coil Concept2007
Author(s)
S., Nomura, K., Kasuya, N., Tanaka, H., Tsutsui, S., Tsuji-Iio, R., Shimada
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Journal Title
IEEE Trans. on Applied Superconductivity Vol. 17
Pages: P1998-2001
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Numerical Evaluation of Ripple-Induced Diffusion of Suprathermal Ion in Tokamaks2007
Author(s)
H., Mimata, K., Tani, K., Tobita, H., Tsutsui, S. Tsuji-Iio, R., Shimada
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Journal Title
Proc. 34th EPS Conference on Plasma Physics
Pages: P5.022
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Voltage Rating Reduction of Magnet Power Supplies Using a Magnetic Energy Recovery Switch2006
Author(s)
T., Isobe, T., Takaku, T., Munakata, H., Tsutsui, S., Tsuji-Iio, R., Shimada
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Journal Title
IEEE Trans. on Applied Superconductivity Vol. 16
Pages: P1646-1649
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Finite Larmor Radius Effects on Ripple-Induced alpha-Particle Diffusion in Spherical Tokamaks2006
Author(s)
H., Mimata, K., Tani, K., Tobita, H., Tsutsui, S., Tsuji-Iio, R., Shimada
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Journal Title
Proceeding of 33rd EPS Conference on Plasma Physics P4.139
Pages: P4.139
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Confinement of Alpha Particles in a Low-Aspect-Ratio Tokamak Reactor2005
Author(s)
K., Tani, K., Tobita, S., Tsuji-Iio, H., Tsutsui, S., Nishio, T., Aoki
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Journal Title
IEEJ Trans. FM Vol. 125
Pages: P938-942
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Simulation Modeling of Fully Non-Inductive Buildup Scenario in High Bootstrap Current Tokamaks without Center Solenoids2005
Author(s)
Y., Nakamura, H., Tsutsui, K., Tobita, N., Takei, Y., Takase, T., Ozeki, S.C., Jardin
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Journal Title
Proceeding of 32st EPS Conference on Plasma Physics
Pages: P.2.051
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Construction of a 7-T Force-Balanced Helical Coil2005
Author(s)
S., Nomura, Y., Ohata, T., Hagita, H., Tsutsui, S., Tsuji-Iio, R., Shimada
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Journal Title
IEEE Trans. on Applied Superconductivity Vol. 15
Pages: P1911-1914
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Advanced configuration of superconducting magnetic energy storage2005
Author(s)
S., Nomura, N., Watanabe, C., Suzuki, H., Ajikawa, M., Uyama, S., Kajita, Y., Ohata, H., Tsutsui, S., Tsuji-Iio, R., Shimada
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Journal Title
Energy Vol. 30
Pages: P2115-2127
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Development of a 7-T Force-Balanced Model Coil for SMES-Repeated Charging-Discharging Test Results2007
Author(s)
Koji, KASUYA, Shinichi, Nomura, Norihiro, TANAKA, Kenji, TSUBOI, Hiroaki, TSUTSUI, Shunji, TSUJI-IIO, Ryuichi, SHIMADA
Organizer
77th Meeting on Cryogenics and Superconducivity
Place of Presentation
Sendai
Year and Date
20071120-22
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Helical Winding Techniques and Training Histories of the Force-Balanced Coils2007
Author(s)
Shinichi, NOMURA, Koji, KASUYA, Norihiro, TANAKA, Kenji, TSUBOI, Hiroaki, TSUTSUI, Shunji, TSUJI-IIO, Ryuichi, SHIMADA
Organizer
77th Meeting on Cryogenics and Superconducivity
Place of Presentation
Sendai
Year and Date
20071120-22
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Possibility of SMES with Force Balance Coils and Industry Application of Repeated Pulsed Load Change Compensator2007
Author(s)
Shinichi, NOMURA, Koji, KASUYA, Norihiro, TANAKA, Hiroaki, TSUTSUI, Shunji, TSUJI-IIO, Ryuichi, SHIMADA
Organizer
IEEJ Technical Meeting of Semiconductor for Power Conversion and Industry Application of Electrical Power
Place of Presentation
Futtsu
Year and Date
20071107-08
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Ripple Resonance Diffusion of Alpha Particles in Tokamaks2007
Author(s)
Hideyuki, Mimata, Keiji, Tani, Kenji, Tobita, Hiroaki, Tsutsui, Shunji, Tsuji-Iio, Ryuichi, Shimada.
Organizer
JSPF 24th Annual Meeting
Place of Presentation
Himeji
Year and Date
2007-11-28
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Loss process of a-particle in Hollow Current2006
Author(s)
Hideyuki, Mimata, Keiji, Tani, Kenji, Tobita, Hiroaki, Tsutsui, Shunji, Tsuji-Iio, Ryuichi, Shimada.
Organizer
JSPF 23th Annual Meeting
Place of Presentation
Tsukuba
Year and Date
2006-12-01
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Finite Larmor Radius Effects on Particle Orbit in Ripple Fields2005
Author(s)
Hideyuki, Mimata, Keiji, Tani, Kenji, Tobita, Hiroaki, Tsutsui, Shunji, Tsuji-Iio, Ryuichi, Shimada
Organizer
JSPF 22th Annual Meeting
Place of Presentation
Tokyo
Year and Date
2005-12-01
Description
「研究成果報告書概要(欧文)」より
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