2016 Fiscal Year Final Research Report
Study of the non-linear behavior of interchange MHD instability and its effect on the helical plasma confinement
| Project/Area Number |
25289342
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Partial Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Nuclear fusion studies
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| Research Institution | National Institute for Fusion Science |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
佐藤 雅彦 核融合科学研究所, ヘリカル研究部, 助教 (80455211)
徳沢 季彦 核融合科学研究所, ヘリカル研究部, 准教授 (90311208)
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| Co-Investigator(Renkei-kenkyūsha) |
SAKAKIBARA Satoru 核融合科学研究所, ヘリカル研究部, 教授 (90280594)
OHTACHI Satoshi 核融合科学研究所, ヘリカル研究部, 教授 (00270489)
SUZUKI Yashihiro 核融合科学研究所, ヘリカル研究部, 教授 (20397558)
TSUCHIYA Hayato 核融合科学研究所, ヘリカル研究部, 教授 (90509522)
TAKEMURA Yuki 核融合科学研究所, ヘリカル研究部, 教授 (60705606)
ITAGAKI Masafumi 北海道大学, 大学院工学研究院, 名誉教授 (30281786)
OKAMOTO Masaaki 石川工業高等専門学校, 電気工学科, 准教授 (60508290)
SHIBATA Yoshihide 岐阜工業高等専門学校, 電気情報工学科, 助教 (20633209)
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| Research Collaborator |
SOGA Ryouta 名古屋大学, 大学院工学研究科
TAKEHARA Keita 名古屋大学, 大学院工学研究科
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| Project Period (FY) |
2013-04-01 – 2017-03-31
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| Keywords | 核融合炉心プラズマ / 環状磁場プラズマ / 電磁流体力学的不安定性 / ミリ波帯電磁波反射計測 / 電子密度揺動計測 / 交換型不安定性 |
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| Outline of Final Research Achievements |
In order to investigate the effects of the interchange instability, which is expected to prevent the discharges with high pressure in helical type fusion reactor, on the plasma confinement, we install the reflect meter with micro-waves in the Large Helical Device (LHD), measure the fluctuation of the magnetic container and the plasma flow velocity on the container, and make the numerical simulation to make clear the driving mechanism of the instability. We find that the occurrence of collapse observed in LHD, which is a phenomenon that the plasma pressure is rapidly reduced, is strongly related with the instability with a magnetic island, which is not consistent with that of conventional interchange instability. We find interchange instability with the island structure, which has smaller growth rate than that of the conventional interchange instability, but the value is not so small comparing with the conventional one when the plasma resistivity is fairly large.
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| Free Research Field |
核融合・プラズマ理工学
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