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Spontaneous mode rotation in RFX

D Terranova, T Bolzonella, S C Guo2005年Plasma Physics and Controlled FusionIF 2.2出版社

A statistical analysis of spontaneous mode rotations in the reversed field experiment (RFX) reversed field pinch is presented. These rotations involve only m = 1 toroidal magnetic field fluctuations with a velocity that is found to be smaller than that of the fluid motion and in the opposite direction. In RFX magnetic fluctuations are mainly present as tearing modes and are usually phase and wall locked. However, a rotation can start when a mode decouples from the interaction with all the other harmonics and its amplitude reduces to a sufficiently small value so that the torque due to the resistive shell is unable to prevent its motion. Both single and multiple simultaneous mode rotations are characterized in terms of the shape of the m = 1 mode spectrum. In the presence of a dominant helicity it is more likely that multiple rotations will be observed. A qualitative torque analysis is presented assuming a three-waves coupling. Also, m = 0 mode rotations are observed and some preliminary results are presented: no m = 1 rotation is seen during these events. An interpretation of the possible mechanisms for mode rotation is provided: m = 0 modes are subject to plasma drag flow at the edge, while secondary m = 1 modes are subject to the electron diamagnetic drift.

日本語訳

反転磁場ピンチ実験(RFX)における自発的モード回転の統計解析を提示する。これらの回転は、m = 1 のトロイダル磁場擾乱のみを伴い、その速度は流体運動の速度よりも小さく、かつ逆向きである。RFX において磁場擾乱は主にテアリングモードとして存在し、通常は位相固定および壁固定の状態にある。しかし、モードが他のすべての高調波との結合から解放され、その振幅が十分に小さくなって抵抗性シェルによるトルクが運動を妨げられなくなると、回転が開始し得る。単一および複数同時のモード回転は、m = 1 モードスペクトルの形状によって特徴づけられる。支配的なヘリシティが存在する場合、複数回転が観測される可能性が高くなる。三波結合を仮定した定性的なトルク解析を提示する。また、m = 0 モードの回転も観測され、その予備的結果を示す:これらの事象の間、m = 1 の回転は見られない。モード回転の可能なメカニズムについての解釈を提供する:m = 0 モードは端部でのプラズマ流動によるドラッグを受け、一方、二次的な m = 1 モードは電子反磁性ドリフトの影響を受ける。

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