2022 Fiscal Year Final Research Report
Elucidation of electron heating mechanism during magnetic reconnection in the presence of high guide field and development of its control technique
| Project/Area Number |
20H01879
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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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| Review Section |
Basic Section 14010:Fundamental plasma-related
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| Research Institution | The University of Tokyo |
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Principal Investigator |
Inomoto Michiaki 東京大学, 大学院新領域創成科学研究科, 教授 (00324799)
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| Co-Investigator(Kenkyū-buntansha) |
小野 靖 東京大学, 大学院新領域創成科学研究科, 教授 (30214191)
神尾 修治 核融合科学研究所, ヘリカル研究部, 助教 (80705525)
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Keywords | 磁気リコネクション / 電子加速 / 球状トカマク |
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| Outline of Final Research Achievements |
In the magnetic reconnection under high guide magnetic field generated in the torus plasma merging experiment, we developed a novel method to change the electrical boundary condition in the downstream region, and succeeded in controlling the electric field component parallel to the magnetic field that directly accelerates the charged particles within a short period. We confirmed that an increase in the electric field component parallel to the magnetic field enhances the acceleration effect of charged particles, and demonstrated that the energy conversion process associated with magnetic reconnection can be transformed. The electric field component parallel to the magnetic field consists of the inductive reconnection electric field and the in-plane static electric field that cancels it. Since the in-plane static electric field in the downstream region is largely affected by the condition in the upstream region, the importance of macroscopic understanding of reconnection was pointed out.
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| Free Research Field |
プラズマ科学
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| Academic Significance and Societal Importance of the Research Achievements |
磁気リコネクション現象において、静電場は受動的な役割を果たすと考えられることが多かったが、本研究は室内実験の利点を活かして静電場を主体的に取り扱うことによって、その役割を明確化し、磁気リコネクションにおけるエネルギー変換機構の解明に寄与できた。また、高ガイド磁場下での磁気リコネクションにおいて解放された磁気エネルギーを、磁力線に平行方向の電子／イオンの運動エネルギーへと変換させうることは、磁場閉じ込め核融合プラズマの初期加熱やフロー形成への応用が期待される。
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