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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| Project Status |
Completed (Fiscal Year 2007)
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| Budget Amount *help |
¥16,780,000 (Direct Cost: ¥15,400,000、Indirect Cost: ¥1,380,000)
Fiscal Year 2007: ¥5,980,000 (Direct Cost: ¥4,600,000、Indirect Cost: ¥1,380,000)
Fiscal Year 2006: ¥4,500,000 (Direct Cost: ¥4,500,000)
Fiscal Year 2005: ¥6,300,000 (Direct Cost: ¥6,300,000)
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| Keywords | spherical torus / alpha particle / ripple / force-balanced coil / virial theorem / finite larmor radius effect / stress / internal transport barrier / リップル立鳴拡散 / リップル共鳴拡散 / 磁気エネルギー回生スイッチ / 拡散係数 |
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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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Report
(4 results)
Research Products
(64 results)
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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
Description
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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
Description
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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
Description
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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
Description
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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
Description
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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
NAID
Description
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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
Description
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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
Description
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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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[Presentation] トカマクにおけるα粒子のリップル共鳴拡散2007
Author(s)
三又 秀行, 谷 啓二, 飛田 健次, 筒井 広明, 飯尾 俊二, 嶋田 隆一
Organizer
プラズマ・核融合学会 第24回年会
Place of Presentation
姫路
Year and Date
2007-11-28
Description
「研究成果報告書概要(和文)」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
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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
Description
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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
Description
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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
Description
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[Presentation] Hollow電流分布中のα粒子の損失過程2006
Author(s)
三又秀行, 谷啓二, 安積正史, 飛田健次, 筒井広明, 飯尾俊二, 嶋田隆一
Organizer
プラズマ・核融合学会 第23回年会
Place of Presentation
筑波
Year and Date
2006-12-01
Description
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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
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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
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