Establishment of empirical scaling of mode penetration in magnetic confined fusion plasma

2016 Fiscal Year Final Research Report

• Project/Area Number: 26420858
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Nuclear fusion studies
• Research Institution: National Institute for Fusion Science
• Principal Investigator: Sakakibara Satoru 核融合科学研究所, ヘリカル研究部, 教授 (90280594)
• Co-Investigator(Renkei-kenkyūsha): NARUSHIMA Yoshiro 核融合科学研究所, ヘリカル研究部, 助教 (40332184) ; OHDACHI Satoshi 核融合科学研究所, ヘリカル研究部, 准教授 (00270489) ; SUZUKI Yasuhiro 核融合科学研究所, ヘリカル研究部, 准教授 (20397558) ; TAKEMURA Yuki 核融合科学研究所, ヘリカル研究部, 助教 (60705606)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: ヘリカルプラズマ / MHD平衡 / MHD不安定性 / 摂動磁場

Outline of Final Research Achievements

Nested magnetic flux surface is required to maintain high performance plasma in magnetic confined fusion reactor. However, when an error field (perturbation field) due to misalignment of magnetic coils exceeds a certain value, MHD instability leading to major disruption is excited. In this study, we had investigated a plasma response to perturbation field in helical plasma in order to clarify the threshold of penetration of perturbation field to the plasma. Experiments show that the penetration threshold strongly depend on magnetic configuration such as magnetic shear, magnetic hill and so on, and the density dependence of the threshold largely changes when the plasma aspect ratio is changed. These results are quite different from those from tokamaks.

Free Research Field

核融合学、プラズマ物理学