Demonstration of plasma position stability with simple helical coils

2014 Fiscal Year Final Research Report

• Project/Area Number: 24360379
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Nuclear fusion studies
• Research Institution: Tokyo Institute of Technology
• Principal Investigator: IIO Shunji 東京工業大学, 原子炉工学研究所, 准教授 (90272723)
• Co-Investigator(Kenkyū-buntansha): TSUTSUI Hiroaki 東京工業大学, 原子炉工学研究所, 准教授 (20227440) ; SHIMADA Ryuichi 東京工業大学, 原子炉工学研究所, 教授 (40206181)
• Research Collaborator: HATAKEYAMA Shoichi 東京工業大学, 大学院創造エネルギー専攻
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: トカマク / 位置安定性 / ヘリカルコイル / ディスラプション / 垂直移動現象 / 自由境界MHD平衡 / トロイダル磁場コイル / フライホイール

Outline of Final Research Achievements

Plasma position stabilizing effect of simple helical coils were confirmed by experiments on a small tokamak with circular cross-section. Three dimensional free boundary calculation showed that MHD equilibria are possible even with simple helical coils installed on half of torus and toroidal field coils and without axisymmetric vertical fields. The horizontal plasma position does not change much even when the plasma current is doubled.
The toroidal field coils (TFCs) of a newly fabricated small tokamak with elongated cross-section to demonstrate the passive plasma position control with simple helical coils are supported only at the outer side of torus by adoption of edge-wise winding of conductors. Vector control of a flywheel generator with an induction motor enabled nearly constant TFC magnetization longer than a second.

Free Research Field

磁場閉じ込め核融合