2002 Fiscal Year Final Research Report Summary
High beta plasma confinement study on a small torus device with a floating high temperature superconductor coil
| Project/Area Number |
12308019
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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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 | The University of Tokyo |
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Principal Investigator |
OGAWA Yuichi The University of Tokyo, High Temperature Plasma Center, Professor, 高温プラズマ研究センター, 教授 (90144170)
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| Co-Investigator(Kenkyū-buntansha) |
MITO Toshiyuki National Institute for Fusion Science, Department of the Large Helical Device, Professor, 大型ヘリカル研究部, 教授 (10166069)
MORIKAWA Junji The University of Tokyo, High Temperature Plasma Center, Research Associate, 高温プラズマ研究センター, 助手 (70192375)
NIHEI Hitoshi The University of Tokyo, Graduate School of Engineering, Research Associate, 大学院・工学系研究科, 助手 (70010973)
IWAKUMA Masataka Kyushu University, Research Institute of Superconductor Science and Systems, Associate Professor, 超伝導システム科学研究センター, 助教授 (30176531)
YANAGI Nagato National Institute for Fusion Science, Department of the Large Helical Device, Associate Professor, 大型ヘリカル研究部, 助教授 (70230258)
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| Project Period (FY) |
2000 – 2002
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| Keywords | high beta plasma / internal coil device / high temperature superconductor coil / persistent current switch / ECH plasma production / heating / magnetic levitation |
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| Research Abstract |
We are aiming at studying high-beta plasmas on a small torus device with a high temperature superconductor coil. From the viewpoint of plasma experiment and device operation, we have employed a high temperature superconducting cable Bi-2223, which has a large heat capacity in comparison with a low temperature superconductor. This is a first challenge for applying the high temperature superconductor coil in fusion plasma devices, and there are few challenges for the feedback levitation of the high temperature superconductor coil.
We have started several R&D issues for the internal coil device Mini-RT ; e.g., the demonstration of the levitation with the miniature device FB-RT, the design and fabrication of the persistent current switch (PCS) and the demonstration of the persistent current operation, and developments of demountable transfer tube and current feed-through.
In the Mini-RT device, we have successfully levitated the high temperature superconductor coil with an accuracy of 10 micrometer during a hour. Since the typical magnetic field is 0.1T around the internal coil, the plasma is produced and heated by the Electron Cyclotron Heating (ECH) with the microwave of 2.45 GHz. The plasma density is (5-7)x10^<16> m^<-3>, and is reaching at the cut-off density of the microwave. The density profile has a peak near the internal coil. The electron and ion temperatures are 10 eV and 1 eV, respectively.
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[Publications] OGAWA Yuichi, HIMURA Haruhiko, HIROTA Makoto, HORI Dan, ITOH Atsushi, KONDOH Shigeo, MORIKAWA Junji, NAKASHIMA Chihiro, NIHEI Hitoshi, NUMATA Ryusuke, OHHASHI Manabu, OHKUNI Kohtaro, OHSAKI Shuichi, SAITOH Haruhiko, SHATASHVILI Nana, VOLPONI Francesco, WAKABAYASHI Hidenori, YOSHIDA Zensho: "Research on High-Beta Plasmas Based on Two-fluids Relaxation Theory"Journal of Plasma and Fusion Research SERIES. Volume 5. 100-105 (2002)
Description
「研究成果報告書概要(欧文)」より
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[Publications] OGAWA Yuichi, MORIKAWA Junji, OHKUNI Kohtaro, NIHEI Hitoshi, HORI Dan, MITO Toshiyuki, YANAGI Nagato, HISHINUMA Yoshimitsu, IWAKUMA Masataka, UEDE Toshio, ITO Ikuo, NOSE Shin-ichi, FUKUI Shigeo: "Construction of a Toroidal Plasma Confinement Device with a Floating Internal Coil for Studying High Beta Plasmas"Journal of Plasma and Fusion Research SERIES. Volume 5. 450-453 (2002)
Description
「研究成果報告書概要(欧文)」より
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